Merge pull request #16323 from EgorBo/ffast-math

[mono-project.git] / mono / mini / aot-compiler.c

/**
 * \file
 * mono Ahead of Time compiler
 *
 * Author:
 *   Dietmar Maurer (dietmar@ximian.com)
 *   Zoltan Varga (vargaz@gmail.com)
 *   Johan Lorensson (lateralusx.github@gmail.com)
 *
 * (C) 2002 Ximian, Inc.
 * Copyright 2003-2011 Novell, Inc 
 * Copyright 2011 Xamarin Inc (http://www.xamarin.com)
 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
 */

#include "config.h"
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#ifndef HOST_WIN32
#include <sys/time.h>
#else
#include <winsock2.h>
#include <windows.h>
#endif

#include <errno.h>
#include <sys/stat.h>

#include <mono/metadata/abi-details.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/class.h>
#include <mono/metadata/object.h>
#include <mono/metadata/tokentype.h>
#include <mono/metadata/appdomain.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/assembly.h>
#include <mono/metadata/metadata-internals.h>
#include <mono/metadata/reflection-internals.h>
#include <mono/metadata/marshal.h>
#include <mono/metadata/gc-internals.h>
#include <mono/metadata/mempool-internals.h>
#include <mono/metadata/mono-endian.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/custom-attrs-internals.h>
#include <mono/utils/mono-logger-internals.h>
#include <mono/utils/mono-compiler.h>
#include <mono/utils/mono-time.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/mono-rand.h>
#include <mono/utils/json.h>
#include <mono/utils/mono-threads-coop.h>
#include <mono/profiler/aot.h>
#include <mono/utils/w32api.h>

#include "aot-compiler.h"
#include "aot-runtime.h"
#include "seq-points.h"
#include "image-writer.h"
#include "dwarfwriter.h"
#include "mini-gc.h"
#include "mini-llvm.h"
#include "mini-runtime.h"

static MonoMethod*
try_get_method_nofail (MonoClass *klass, const char *method_name, int param_count, int flags)
{
        MonoMethod *result;
        ERROR_DECL (error);
        result = mono_class_get_method_from_name_checked (klass, method_name, param_count, flags, error);
        mono_error_assert_ok (error);
        return result;
}

static MonoMethod*
get_method_nofail (MonoClass *klass, const char *method_name, int param_count, int flags)
{
        MonoMethod *result = try_get_method_nofail (klass, method_name, param_count, flags);
        g_assertf (result, "Expected to find method %s in klass %s", method_name, m_class_get_name (klass));
        return result;
}

#if !defined(DISABLE_AOT) && !defined(DISABLE_JIT)

// Use MSVC toolchain, Clang for MSVC using MSVC codegen and linker, when compiling for AMD64
// targeting WIN32 platforms running AOT compiler on WIN32 platform with VS installation.
#if defined(TARGET_AMD64) && defined(TARGET_WIN32) && defined(HOST_WIN32) && defined(_MSC_VER)
#define TARGET_X86_64_WIN32_MSVC
#endif

#if defined(TARGET_X86_64_WIN32_MSVC)
#define TARGET_WIN32_MSVC
#endif

// Emit native unwind info on Windows platforms (different from DWARF). Emitted unwind info
// works when using the MSVC toolchain using Clang for MSVC codegen and linker. Only supported when
// compiling for AMD64 (Windows x64 platforms).
#if defined(TARGET_WIN32_MSVC) && defined(MONO_ARCH_HAVE_UNWIND_TABLE)
#define EMIT_WIN32_UNWIND_INFO
#endif

#if defined(__linux__)
#define RODATA_SECT ".rodata"
#elif defined(TARGET_MACH)
#define RODATA_SECT ".section __TEXT, __const"
#elif defined(TARGET_WIN32_MSVC)
#define RODATA_SECT ".rdata"
#else
#define RODATA_SECT ".text"
#endif

#define TV_DECLARE(name) gint64 name
#define TV_GETTIME(tv) tv = mono_100ns_ticks ()
#define TV_ELAPSED(start,end) (((end) - (start)) / 10)

#define ROUND_DOWN(VALUE,SIZE)  ((VALUE) & ~((SIZE) - 1))

typedef struct {
        char *name;
        MonoImage *image;
} ImageProfileData;

typedef struct ClassProfileData ClassProfileData;

typedef struct {
        int argc;
        ClassProfileData **argv;
        MonoGenericInst *inst;
} GInstProfileData;

struct ClassProfileData {
        ImageProfileData *image;
        char *ns, *name;
        GInstProfileData *inst;
        MonoClass *klass;
};

typedef struct {
        ClassProfileData *klass;
        int id;
        char *name;
        int param_count;
        char *signature;
        GInstProfileData *inst;
        MonoMethod *method;
} MethodProfileData;

typedef struct {
        GHashTable *images, *classes, *ginsts, *methods;
} ProfileData;

/* predefined values for static readonly fields without needed to run the .cctor */
typedef struct _ReadOnlyValue ReadOnlyValue;
struct _ReadOnlyValue {
        ReadOnlyValue *next;
        char *name;
        int type; /* to be used later for typechecking to prevent user errors */
        union {
                guint8 i1;
                guint16 i2;
                guint32 i4;
                guint64 i8;
                gpointer ptr;
        } value;
};
static ReadOnlyValue *readonly_values;

typedef struct MonoAotOptions {
        char *outfile;
        char *llvm_outfile;
        char *data_outfile;
        GList *profile_files;
        gboolean save_temps;
        gboolean write_symbols;
        gboolean metadata_only;
        gboolean bind_to_runtime_version;
        MonoAotMode mode;
        gboolean interp;
        gboolean no_dlsym;
        gboolean static_link;
        gboolean asm_only;
        gboolean asm_writer;
        gboolean nodebug;
        gboolean dwarf_debug;
        gboolean soft_debug;
        gboolean log_generics;
        gboolean log_instances;
        gboolean gen_msym_dir;
        char *gen_msym_dir_path;
        gboolean direct_pinvoke;
        gboolean direct_icalls;
        gboolean no_direct_calls;
        gboolean use_trampolines_page;
        gboolean no_instances;
        // We are collecting inflated methods and emitting non-inflated
        gboolean dedup; 
        // The name of the assembly for which the AOT module is going to have all deduped methods moved to. 
        // When set, we are emitting inflated methods only
        char *dedup_include; 
        gboolean gnu_asm;
        gboolean try_llvm;
        gboolean llvm;
        gboolean llvm_only;
        gboolean llvm_disable_self_init;
        int nthreads;
        int ntrampolines;
        int nrgctx_trampolines;
        int nimt_trampolines;
        int ngsharedvt_arg_trampolines;
        int nftnptr_arg_trampolines;
        int nrgctx_fetch_trampolines;
        int nunbox_arbitrary_trampolines;
        gboolean print_skipped_methods;
        gboolean stats;
        gboolean verbose;
        gboolean deterministic;
        char *tool_prefix;
        char *ld_flags;
        char *mtriple;
        char *llvm_path;
        char *temp_path;
        char *instances_logfile_path;
        char *logfile;
        char *llvm_opts;
        char *llvm_llc;
        gboolean dump_json;
        gboolean profile_only;
        gboolean no_opt;
        char *clangxx;
        char *depfile;
} MonoAotOptions;

typedef enum {
        METHOD_CAT_NORMAL,
        METHOD_CAT_GSHAREDVT,
        METHOD_CAT_INST,
        METHOD_CAT_WRAPPER,
        METHOD_CAT_NUM
} MethodCategory;

typedef struct MonoAotStats {
        int ccount, mcount, lmfcount, abscount, gcount, ocount, genericcount;
        gint64 code_size, method_info_size, ex_info_size, unwind_info_size, got_size, class_info_size, got_info_size, plt_size, blob_size;
        int methods_without_got_slots, direct_calls, all_calls, llvm_count;
        int got_slots, offsets_size;
        int method_categories [METHOD_CAT_NUM];
        int got_slot_types [MONO_PATCH_INFO_NUM];
        int got_slot_info_sizes [MONO_PATCH_INFO_NUM];
        int jit_time, gen_time, link_time;
        int method_ref_count, method_ref_size;
        int class_ref_count, class_ref_size;
        int ginst_count, ginst_size;
} MonoAotStats;

typedef struct GotInfo {
        GHashTable *patch_to_got_offset;
        GHashTable **patch_to_got_offset_by_type;
        GPtrArray *got_patches;
} GotInfo;

#ifdef EMIT_WIN32_UNWIND_INFO
typedef struct _UnwindInfoSectionCacheItem {
        char *xdata_section_label;
        PUNWIND_INFO unwind_info;
        gboolean xdata_section_emitted;
} UnwindInfoSectionCacheItem;
#endif

typedef struct MonoAotCompile {
        MonoImage *image;
        GPtrArray *methods;
        GHashTable *method_indexes;
        GHashTable *method_depth;
        MonoCompile **cfgs;
        int cfgs_size;
        GHashTable **patch_to_plt_entry;
        GHashTable *plt_offset_to_entry;
        //GHashTable *patch_to_got_offset;
        //GHashTable **patch_to_got_offset_by_type;
        //GPtrArray *got_patches;
        GotInfo got_info, llvm_got_info;
        GHashTable *image_hash;
        GHashTable *method_to_cfg;
        GHashTable *token_info_hash;
        GHashTable *method_to_pinvoke_import;
        GHashTable *method_to_external_icall_symbol_name;
        GPtrArray *extra_methods;
        GPtrArray *image_table;
        GPtrArray *globals;
        GPtrArray *method_order;
        GHashTable *dedup_stats;
        GHashTable *dedup_cache;
        gboolean dedup_cache_changed;
        GHashTable *export_names;
        /* Maps MonoClass* -> blob offset */
        GHashTable *klass_blob_hash;
        /* Maps MonoMethod* -> blob offset */
        GHashTable *method_blob_hash;
        /* Maps MonoGenericInst* -> blob offset */
        GHashTable *ginst_blob_hash;
        GHashTable *gsharedvt_in_signatures;
        GHashTable *gsharedvt_out_signatures;
        guint32 *plt_got_info_offsets;
        guint32 got_offset, llvm_got_offset, plt_offset, plt_got_offset_base, nshared_got_entries;
        /* Number of GOT entries reserved for trampolines */
        guint32 num_trampoline_got_entries;
        guint32 tramp_page_size;

        guint32 table_offsets [MONO_AOT_TABLE_NUM];
        guint32 num_trampolines [MONO_AOT_TRAMP_NUM];
        guint32 trampoline_got_offset_base [MONO_AOT_TRAMP_NUM];
        guint32 trampoline_size [MONO_AOT_TRAMP_NUM];
        guint32 tramp_page_code_offsets [MONO_AOT_TRAMP_NUM];

        MonoAotOptions aot_opts;
        guint32 nmethods;
        guint32 nextra_methods;
        guint32 opts;
        guint32 simd_opts;
        MonoMemPool *mempool;
        MonoAotStats stats;
        int method_index;
        char *static_linking_symbol;
        mono_mutex_t mutex;
        gboolean gas_line_numbers;
        /* Whenever to emit an object file directly from llc */
        gboolean llvm_owriter;
        gboolean llvm_owriter_supported;
        MonoImageWriter *w;
        MonoDwarfWriter *dwarf;
        FILE *fp;
        char *tmpbasename;
        char *tmpfname;
        char *temp_dir_to_delete;
        char *llvm_sfile;
        char *llvm_ofile;
        GSList *cie_program;
        GHashTable *unwind_info_offsets;
        GPtrArray *unwind_ops;
        guint32 unwind_info_offset;
        char *global_prefix;
        char *got_symbol;
        char *llvm_got_symbol;
        char *plt_symbol;
        char *llvm_eh_frame_symbol;
        GHashTable *method_label_hash;
        const char *temp_prefix;
        const char *user_symbol_prefix;
        const char *llvm_label_prefix;
        const char *inst_directive;
        int align_pad_value;
        guint32 label_generator;
        gboolean llvm;
        gboolean has_jitted_code;
        gboolean is_full_aot;
        gboolean dedup_collect_only;
        MonoAotFileFlags flags;
        MonoDynamicStream blob;
        gboolean blob_closed;
        GHashTable *typespec_classes;
        GString *llc_args;
        GString *as_args;
        char *assembly_name_sym;
        GHashTable *plt_entry_debug_sym_cache;
        gboolean thumb_mixed, need_no_dead_strip, need_pt_gnu_stack;
        GHashTable *ginst_hash;
        GHashTable *dwarf_ln_filenames;
        gboolean global_symbols;
        int objc_selector_index, objc_selector_index_2;
        GPtrArray *objc_selectors;
        GHashTable *objc_selector_to_index;
        GList *profile_data;
        GHashTable *profile_methods;
#ifdef EMIT_WIN32_UNWIND_INFO
        GList *unwind_info_section_cache;
#endif
        FILE *logfile;
        FILE *instances_logfile;
        FILE *data_outfile;
        int datafile_offset;
        int gc_name_offset;
        // In this mode, we are emitting dedupable methods that we encounter
        gboolean dedup_emit_mode;
} MonoAotCompile;

typedef struct {
        int plt_offset;
        char *symbol, *llvm_symbol, *debug_sym;
        MonoJumpInfo *ji;
        gboolean jit_used, llvm_used;
} MonoPltEntry;

#define mono_acfg_lock(acfg) mono_os_mutex_lock (&((acfg)->mutex))
#define mono_acfg_unlock(acfg) mono_os_mutex_unlock (&((acfg)->mutex))

/* This points to the current acfg in LLVM mode */
static MonoAotCompile *llvm_acfg;

/* Cache of decoded method external icall symbol names. */
/* Owned by acfg, but kept in this static as well since it is */
/* accessed by code paths not having access to acfg. */
static GHashTable *method_to_external_icall_symbol_name;

// This, instead of an array of pointers, to optimize away a pointer and a relocation per string.
#define MSGSTRFIELD(line) MSGSTRFIELD1(line)
#define MSGSTRFIELD1(line) str##line
static const struct msgstr_t {
#define PATCH_INFO(a,b) char MSGSTRFIELD(__LINE__) [sizeof (b)];
#include "patch-info.h"
#undef PATCH_INFO
} opstr = {
#define PATCH_INFO(a,b) b,
#include "patch-info.h"
#undef PATCH_INFO
};
static const gint16 opidx [] = {
#define PATCH_INFO(a,b) offsetof (struct msgstr_t, MSGSTRFIELD(__LINE__)),
#include "patch-info.h"
#undef PATCH_INFO
};

static G_GNUC_UNUSED const char*
get_patch_name (int info)
{
        return (const char*)&opstr + opidx [info];
}

static int
emit_aot_image (MonoAotCompile *acfg);

static void 
mono_flush_method_cache (MonoAotCompile *acfg);

static void 
mono_read_method_cache (MonoAotCompile *acfg);

static guint32
get_unwind_info_offset (MonoAotCompile *acfg, guint8 *encoded, guint32 encoded_len);

static char*
get_plt_entry_debug_sym (MonoAotCompile *acfg, MonoJumpInfo *ji, GHashTable *cache);

static void
add_gsharedvt_wrappers (MonoAotCompile *acfg, MonoMethodSignature *sig, gboolean gsharedvt_in, gboolean gsharedvt_out, gboolean interp_in);

static void
add_profile_instances (MonoAotCompile *acfg, ProfileData *data);

static inline gboolean
ignore_cfg (MonoCompile *cfg)
{
        return !cfg || cfg->skip;
}

static void
aot_printf (MonoAotCompile *acfg, const gchar *format, ...)
{
        FILE *output;
        va_list args;

        if (acfg->logfile)
                output = acfg->logfile;
        else
                output = stdout;

        va_start (args, format);
        vfprintf (output, format, args);
        va_end (args);
}

static void
aot_printerrf (MonoAotCompile *acfg, const gchar *format, ...)
{
        FILE *output;
        va_list args;

        if (acfg->logfile)
                output = acfg->logfile;
        else
                output = stderr;

        va_start (args, format);
        vfprintf (output, format, args);
        va_end (args);
}

static void
report_loader_error (MonoAotCompile *acfg, MonoError *error, gboolean fatal, const char *format, ...)
{
        FILE *output;
        va_list args;

        if (is_ok (error))
                return;

        if (acfg->logfile)
                output = acfg->logfile;
        else
                output = stderr;

        va_start (args, format);
        vfprintf (output, format, args);
        va_end (args);
        mono_error_cleanup (error);

        if (acfg->is_full_aot && fatal) {
                fprintf (output, "FullAOT cannot continue if there are loader errors.\n");
                exit (1);
        }
}

/* Wrappers around the image writer functions */

#define MAX_SYMBOL_SIZE 256

static inline const char *
mangle_symbol (const char * symbol, char * mangled_symbol, gsize length)
{
        gsize needed_size = length;

        g_assert (NULL != symbol);
        g_assert (NULL != mangled_symbol);
        g_assert (0 != length);

#if defined(TARGET_WIN32) && defined(TARGET_X86)
        if (symbol && '_' != symbol [0]) {
                needed_size = g_snprintf (mangled_symbol, length, "_%s", symbol);
        } else {
                needed_size = g_snprintf (mangled_symbol, length, "%s", symbol);
        }
#else
        needed_size = g_snprintf (mangled_symbol, length, "%s", symbol);
#endif

        g_assert (0 <= needed_size && needed_size < length);
        return mangled_symbol;
}

static inline char *
mangle_symbol_alloc (const char * symbol)
{
        g_assert (NULL != symbol);

#if defined(TARGET_WIN32) && defined(TARGET_X86)
        if (symbol && '_' != symbol [0]) {
                return g_strdup_printf ("_%s", symbol);
        }
        else {
                return g_strdup_printf ("%s", symbol);
        }
#else
        return g_strdup_printf ("%s", symbol);
#endif
}

static inline void
emit_section_change (MonoAotCompile *acfg, const char *section_name, int subsection_index)
{
        mono_img_writer_emit_section_change (acfg->w, section_name, subsection_index);
}

#if defined(TARGET_WIN32) && defined(TARGET_X86)

static inline void
emit_local_symbol (MonoAotCompile *acfg, const char *name, const char *end_label, gboolean func)
{
        const char * mangled_symbol_name = name;
        char * mangled_symbol_name_alloc = NULL;

        if (TRUE == func) {
                mangled_symbol_name_alloc = mangle_symbol_alloc (name);
                mangled_symbol_name = mangled_symbol_name_alloc;
        }

        if (name != mangled_symbol_name && 0 != g_strcasecmp (name, mangled_symbol_name)) {
                mono_img_writer_emit_label (acfg->w, mangled_symbol_name);
        }
        mono_img_writer_emit_local_symbol (acfg->w, mangled_symbol_name, end_label, func);

        if (NULL != mangled_symbol_name_alloc) {
                g_free (mangled_symbol_name_alloc);
        }
}

#else

static inline void
emit_local_symbol (MonoAotCompile *acfg, const char *name, const char *end_label, gboolean func) 
{ 
        mono_img_writer_emit_local_symbol (acfg->w, name, end_label, func);
}

#endif

static inline void
emit_label (MonoAotCompile *acfg, const char *name) 
{ 
        mono_img_writer_emit_label (acfg->w, name); 
}

static inline void
emit_bytes (MonoAotCompile *acfg, const guint8* buf, int size) 
{ 
        mono_img_writer_emit_bytes (acfg->w, buf, size); 
}

static inline void
emit_string (MonoAotCompile *acfg, const char *value) 
{ 
        mono_img_writer_emit_string (acfg->w, value); 
}

static inline void
emit_line (MonoAotCompile *acfg) 
{ 
        mono_img_writer_emit_line (acfg->w); 
}

static inline void
emit_alignment (MonoAotCompile *acfg, int size)
{ 
        mono_img_writer_emit_alignment (acfg->w, size);
}

static inline void
emit_alignment_code (MonoAotCompile *acfg, int size)
{
        if (acfg->align_pad_value)
                mono_img_writer_emit_alignment_fill (acfg->w, size, acfg->align_pad_value);
        else
                mono_img_writer_emit_alignment (acfg->w, size);
}

static inline void
emit_padding (MonoAotCompile *acfg, int size)
{
        int i;
        guint8 buf [16];

        if (acfg->align_pad_value) {
                for (i = 0; i < 16; ++i)
                        buf [i] = acfg->align_pad_value;
        } else {
                memset (buf, 0, sizeof (buf));
        }

        for (i = 0; i < size; i += 16) {
                if (size - i < 16)
                        emit_bytes (acfg, buf, size - i);
                else
                        emit_bytes (acfg, buf, 16);
        }
}

static inline void
emit_pointer (MonoAotCompile *acfg, const char *target) 
{ 
        mono_img_writer_emit_pointer (acfg->w, target); 
}

static inline void
emit_pointer_2 (MonoAotCompile *acfg, const char *prefix, const char *target) 
{ 
        if (prefix [0] != '\0') {
                char *s = g_strdup_printf ("%s%s", prefix, target);
                mono_img_writer_emit_pointer (acfg->w, s);
                g_free (s);
        } else {
                mono_img_writer_emit_pointer (acfg->w, target);
        }
}

static inline void
emit_int16 (MonoAotCompile *acfg, int value) 
{ 
        mono_img_writer_emit_int16 (acfg->w, value); 
}

static inline void
emit_int32 (MonoAotCompile *acfg, int value) 
{ 
        mono_img_writer_emit_int32 (acfg->w, value); 
}

static inline void
emit_symbol_diff (MonoAotCompile *acfg, const char *end, const char* start, int offset) 
{ 
        mono_img_writer_emit_symbol_diff (acfg->w, end, start, offset); 
}

static inline void
emit_zero_bytes (MonoAotCompile *acfg, int num) 
{ 
        mono_img_writer_emit_zero_bytes (acfg->w, num); 
}

static inline void
emit_byte (MonoAotCompile *acfg, guint8 val) 
{ 
        mono_img_writer_emit_byte (acfg->w, val); 
}

#if defined(TARGET_WIN32) && defined(TARGET_X86)

static G_GNUC_UNUSED void
emit_global_inner (MonoAotCompile *acfg, const char *name, gboolean func)
{
        const char * mangled_symbol_name = name;
        char * mangled_symbol_name_alloc = NULL;

        mangled_symbol_name_alloc = mangle_symbol_alloc (name);
        mangled_symbol_name = mangled_symbol_name_alloc;
        
        if (0 != g_strcasecmp (name, mangled_symbol_name)) {
                mono_img_writer_emit_label (acfg->w, mangled_symbol_name);
        }
        mono_img_writer_emit_global (acfg->w, mangled_symbol_name, func);

        if (NULL != mangled_symbol_name_alloc) {
                g_free (mangled_symbol_name_alloc);
        }
}

#else

static G_GNUC_UNUSED void
emit_global_inner (MonoAotCompile *acfg, const char *name, gboolean func)
{
        mono_img_writer_emit_global (acfg->w, name, func);
}

#endif

static inline gboolean
link_shared_library (MonoAotCompile *acfg)
{
        return !acfg->aot_opts.static_link && !acfg->aot_opts.asm_only;
}

static inline gboolean
add_to_global_symbol_table (MonoAotCompile *acfg)
{
#ifdef TARGET_WIN32_MSVC
        return acfg->aot_opts.no_dlsym || link_shared_library (acfg);
#else
        return acfg->aot_opts.no_dlsym;
#endif
}

static void
emit_global (MonoAotCompile *acfg, const char *name, gboolean func)
{
        if (add_to_global_symbol_table (acfg))
                g_ptr_array_add (acfg->globals, g_strdup (name));

        if (acfg->aot_opts.no_dlsym) {
                mono_img_writer_emit_local_symbol (acfg->w, name, NULL, func);
        } else {
                emit_global_inner (acfg, name, func);
        }
}

static void
emit_symbol_size (MonoAotCompile *acfg, const char *name, const char *end_label)
{
        mono_img_writer_emit_symbol_size (acfg->w, name, end_label);
}

/* Emit a symbol which is referenced by the MonoAotFileInfo structure */
static void
emit_info_symbol (MonoAotCompile *acfg, const char *name, gboolean func)
{
        char symbol [MAX_SYMBOL_SIZE];

        if (acfg->llvm) {
                emit_label (acfg, name);
                /* LLVM generated code references this */
                sprintf (symbol, "%s%s%s", acfg->user_symbol_prefix, acfg->global_prefix, name);
                emit_label (acfg, symbol);

#ifndef TARGET_WIN32_MSVC
                emit_global_inner (acfg, symbol, FALSE);
#else
                emit_global_inner (acfg, symbol, func);
#endif
        } else {
                emit_label (acfg, name);
        }
}

static void
emit_string_symbol (MonoAotCompile *acfg, const char *name, const char *value)
{
        if (acfg->llvm) {
                mono_llvm_emit_aot_data (name, (guint8*)value, strlen (value) + 1);
                return;
        }

        mono_img_writer_emit_section_change (acfg->w, RODATA_SECT, 1);
#ifdef TARGET_MACH
        /* On apple, all symbols need to be aligned to avoid warnings from ld */
        emit_alignment (acfg, 4);
#endif
        mono_img_writer_emit_label (acfg->w, name);
        mono_img_writer_emit_string (acfg->w, value);
}

static G_GNUC_UNUSED void
emit_uleb128 (MonoAotCompile *acfg, guint32 value)
{
        do {
                guint8 b = value & 0x7f;
                value >>= 7;
                if (value != 0) /* more bytes to come */
                        b |= 0x80;
                emit_byte (acfg, b);
        } while (value);
}

static G_GNUC_UNUSED void
emit_sleb128 (MonoAotCompile *acfg, gint64 value)
{
        gboolean more = 1;
        gboolean negative = (value < 0);
        guint32 size = 64;
        guint8 byte;

        while (more) {
                byte = value & 0x7f;
                value >>= 7;
                /* the following is unnecessary if the
                 * implementation of >>= uses an arithmetic rather
                 * than logical shift for a signed left operand
                 */
                if (negative)
                        /* sign extend */
                        value |= - ((gint64)1 <<(size - 7));
                /* sign bit of byte is second high order bit (0x40) */
                if ((value == 0 && !(byte & 0x40)) ||
                        (value == -1 && (byte & 0x40)))
                        more = 0;
                else
                        byte |= 0x80;
                emit_byte (acfg, byte);
        }
}

static G_GNUC_UNUSED void
encode_uleb128 (guint32 value, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;

        do {
                guint8 b = value & 0x7f;
                value >>= 7;
                if (value != 0) /* more bytes to come */
                        b |= 0x80;
                *p ++ = b;
        } while (value);

        *endbuf = p;
}

static G_GNUC_UNUSED void
encode_sleb128 (gint32 value, guint8 *buf, guint8 **endbuf)
{
        gboolean more = 1;
        gboolean negative = (value < 0);
        guint32 size = 32;
        guint8 byte;
        guint8 *p = buf;

        while (more) {
                byte = value & 0x7f;
                value >>= 7;
                /* the following is unnecessary if the
                 * implementation of >>= uses an arithmetic rather
                 * than logical shift for a signed left operand
                 */
                if (negative)
                        /* sign extend */
                        value |= - (1 <<(size - 7));
                /* sign bit of byte is second high order bit (0x40) */
                if ((value == 0 && !(byte & 0x40)) ||
                        (value == -1 && (byte & 0x40)))
                        more = 0;
                else
                        byte |= 0x80;
                *p ++= byte;
        }

        *endbuf = p;
}

static void
encode_int (gint32 val, guint8 *buf, guint8 **endbuf)
{
        // FIXME: Big-endian
        buf [0] = (val >> 0) & 0xff;
        buf [1] = (val >> 8) & 0xff;
        buf [2] = (val >> 16) & 0xff;
        buf [3] = (val >> 24) & 0xff;

        *endbuf = buf + 4;
}

static void
encode_int16 (guint16 val, guint8 *buf, guint8 **endbuf)
{
        buf [0] = (val >> 0) & 0xff;
        buf [1] = (val >> 8) & 0xff;

        *endbuf = buf + 2;
}

static void
encode_string (const char *s, guint8 *buf, guint8 **endbuf)
{
        int len = strlen (s);

        memcpy (buf, s, len + 1);
        *endbuf = buf + len + 1;
}

static void
emit_unset_mode (MonoAotCompile *acfg)
{
        mono_img_writer_emit_unset_mode (acfg->w);
}

static G_GNUC_UNUSED void
emit_set_thumb_mode (MonoAotCompile *acfg)
{
        emit_unset_mode (acfg);
        fprintf (acfg->fp, ".code 16\n");
}

static G_GNUC_UNUSED void
emit_set_arm_mode (MonoAotCompile *acfg)
{
        emit_unset_mode (acfg);
        fprintf (acfg->fp, ".code 32\n");
}

static inline void
emit_code_bytes (MonoAotCompile *acfg, const guint8* buf, int size)
{
#ifdef TARGET_ARM64
        int i;

        g_assert (size % 4 == 0);
        emit_unset_mode (acfg);
        for (i = 0; i < size; i += 4)
                fprintf (acfg->fp, "%s 0x%x\n", acfg->inst_directive, *(guint32*)(buf + i));
#else
        emit_bytes (acfg, buf, size);
#endif
}

/* ARCHITECTURE SPECIFIC CODE */

#if defined(TARGET_X86) || defined(TARGET_AMD64) || defined(TARGET_ARM) || defined(TARGET_POWERPC) || defined(TARGET_ARM64) || defined (TARGET_RISCV)
#define EMIT_DWARF_INFO 1
#endif

#ifdef TARGET_WIN32_MSVC
#undef EMIT_DWARF_INFO
#define EMIT_WIN32_CODEVIEW_INFO
#endif

#ifdef EMIT_WIN32_UNWIND_INFO
static UnwindInfoSectionCacheItem *
get_cached_unwind_info_section_item_win32 (MonoAotCompile *acfg, const char *function_start, const char *function_end, GSList *unwind_ops);

static void
free_unwind_info_section_cache_win32 (MonoAotCompile *acfg);

static void
emit_unwind_info_data_win32 (MonoAotCompile *acfg, PUNWIND_INFO unwind_info);

static void
emit_unwind_info_sections_win32 (MonoAotCompile *acfg, const char *function_start, const char *function_end, GSList *unwind_ops);
#endif

static void
arch_free_unwind_info_section_cache (MonoAotCompile *acfg)
{
#ifdef EMIT_WIN32_UNWIND_INFO
        free_unwind_info_section_cache_win32 (acfg);
#endif
}

static void
arch_emit_unwind_info_sections (MonoAotCompile *acfg, const char *function_start, const char *function_end, GSList *unwind_ops)
{
#ifdef EMIT_WIN32_UNWIND_INFO
        gboolean own_unwind_ops = FALSE;
        if (!unwind_ops) {
                unwind_ops = mono_unwind_get_cie_program ();
                own_unwind_ops = TRUE;
        }

        emit_unwind_info_sections_win32 (acfg, function_start, function_end, unwind_ops);

        if (own_unwind_ops)
                mono_free_unwind_info (unwind_ops);
#endif
}

#if defined(TARGET_ARM)
#define AOT_FUNC_ALIGNMENT 4
#else
#define AOT_FUNC_ALIGNMENT 16
#endif
 
#if defined(TARGET_POWERPC64) && !defined(MONO_ARCH_ILP32)
#define PPC_LD_OP "ld"
#define PPC_LDX_OP "ldx"
#else
#define PPC_LD_OP "lwz"
#define PPC_LDX_OP "lwzx"
#endif

#ifdef TARGET_X86_64_WIN32_MSVC
#define AOT_TARGET_STR "AMD64 (WIN32) (MSVC codegen)"
#elif TARGET_AMD64
#define AOT_TARGET_STR "AMD64"
#endif

#ifdef TARGET_ARM
#ifdef TARGET_MACH
#define AOT_TARGET_STR "ARM (MACH)"
#else
#define AOT_TARGET_STR "ARM (!MACH)"
#endif
#endif

#ifdef TARGET_ARM64
#ifdef TARGET_MACH
#define AOT_TARGET_STR "ARM64 (MACH)"
#else
#define AOT_TARGET_STR "ARM64 (!MACH)"
#endif
#endif

#ifdef TARGET_POWERPC64
#ifdef MONO_ARCH_ILP32
#define AOT_TARGET_STR "POWERPC64 (mono ilp32)"
#else
#define AOT_TARGET_STR "POWERPC64 (!mono ilp32)"
#endif
#else
#ifdef TARGET_POWERPC
#ifdef MONO_ARCH_ILP32
#define AOT_TARGET_STR "POWERPC (mono ilp32)"
#else
#define AOT_TARGET_STR "POWERPC (!mono ilp32)"
#endif
#endif
#endif

#ifdef TARGET_RISCV32
#define AOT_TARGET_STR "RISCV32"
#endif

#ifdef TARGET_RISCV64
#define AOT_TARGET_STR "RISCV64"
#endif

#ifdef TARGET_X86
#ifdef TARGET_WIN32
#define AOT_TARGET_STR "X86 (WIN32)"
#else
#define AOT_TARGET_STR "X86"
#endif
#endif

#ifndef AOT_TARGET_STR
#define AOT_TARGET_STR ""
#endif

static void
arch_init (MonoAotCompile *acfg)
{
        acfg->llc_args = g_string_new ("");
        acfg->as_args = g_string_new ("");
        acfg->llvm_owriter_supported = TRUE;

        /*
         * The prefix LLVM likes to put in front of symbol names on darwin.
         * The mach-os specs require this for globals, but LLVM puts them in front of all
         * symbols. We need to handle this, since we need to refer to LLVM generated
         * symbols.
         */
        acfg->llvm_label_prefix = "";
        acfg->user_symbol_prefix = "";

#if TARGET_X86 || TARGET_AMD64
        const gboolean has_custom_args = !!acfg->aot_opts.llvm_llc;
#endif

#if defined(TARGET_X86)
        g_string_append_printf (acfg->llc_args, " -march=x86 %s", has_custom_args ? "" : "-mcpu=generic");
#endif

#if defined(TARGET_AMD64)
        g_string_append_printf (acfg->llc_args, " -march=x86-64 %s", has_custom_args ? "" : "-mcpu=generic");
        /* NOP */
        acfg->align_pad_value = 0x90;
#endif

        if (mono_use_fast_math) {
                // same parameters are passed to opt and LLVM JIT
                g_string_append (acfg->llc_args, " -fp-contract=fast -enable-no-infs-fp-math -enable-no-nans-fp-math -enable-no-signed-zeros-fp-math -enable-no-trapping-fp-math -enable-unsafe-fp-math");
        }

#ifdef TARGET_ARM
        if (acfg->aot_opts.mtriple && strstr (acfg->aot_opts.mtriple, "darwin")) {
                g_string_append (acfg->llc_args, "-mattr=+v6");
        } else {
                if (!(acfg->aot_opts.mtriple && strstr (acfg->aot_opts.mtriple, "thumb")))
                        g_string_append (acfg->llc_args, " -march=arm");

                if (acfg->aot_opts.mtriple && strstr (acfg->aot_opts.mtriple, "ios")) {
                        g_string_append (acfg->llc_args, " -mattr=+v7");
                        g_string_append (acfg->llc_args, " -exception-model=dwarf -disable-fp-elim");
                }

#if defined(ARM_FPU_VFP_HARD)
                g_string_append (acfg->llc_args, " -mattr=+vfp2,-neon,+d16 -float-abi=hard");
                g_string_append (acfg->as_args, " -mfpu=vfp3");
#elif defined(ARM_FPU_VFP)
                g_string_append (acfg->llc_args, " -mattr=+vfp2,-neon,+d16");
                g_string_append (acfg->as_args, " -mfpu=vfp3");
#else
                g_string_append (acfg->llc_args, " -mattr=+soft-float");
#endif
        }
        if (acfg->aot_opts.mtriple && strstr (acfg->aot_opts.mtriple, "thumb"))
                acfg->thumb_mixed = TRUE;

        if (acfg->aot_opts.mtriple)
                mono_arch_set_target (acfg->aot_opts.mtriple);
#endif

#ifdef TARGET_ARM64
        g_string_append (acfg->llc_args, " -march=aarch64");
        acfg->inst_directive = ".inst";
        if (acfg->aot_opts.mtriple)
                mono_arch_set_target (acfg->aot_opts.mtriple);
#endif

#ifdef TARGET_MACH
        acfg->user_symbol_prefix = "_";
        acfg->llvm_label_prefix = "_";
        acfg->inst_directive = ".word";
        acfg->need_no_dead_strip = TRUE;
        acfg->aot_opts.gnu_asm = TRUE;
#endif

#if defined(__linux__) && !defined(TARGET_ARM)
        acfg->need_pt_gnu_stack = TRUE;
#endif

#ifdef TARGET_RISCV
        if (acfg->aot_opts.mtriple)
                mono_arch_set_target (acfg->aot_opts.mtriple);

#ifdef TARGET_RISCV64

        g_string_append (acfg->as_args, " -march=rv64i ");
#ifdef RISCV_FPABI_DOUBLE
        g_string_append (acfg->as_args, " -mabi=lp64d");
#else
        g_string_append (acfg->as_args, " -mabi=lp64");
#endif

#else

        g_string_append (acfg->as_args, " -march=rv32i ");
#ifdef RISCV_FPABI_DOUBLE
        g_string_append (acfg->as_args, " -mabi=ilp32d ");
#else
        g_string_append (acfg->as_args, " -mabi=ilp32 ");
#endif

#endif

#endif

#ifdef MONOTOUCH
        acfg->global_symbols = TRUE;
#endif

#ifdef TARGET_ANDROID
        acfg->llvm_owriter_supported = FALSE;
#endif
}

#ifdef TARGET_ARM64


/* Load the contents of GOT_SLOT into dreg, clobbering ip0 */
static void
arm64_emit_load_got_slot (MonoAotCompile *acfg, int dreg, int got_slot)
{
        int offset;

        g_assert (acfg->fp);
        emit_unset_mode (acfg);
        /* r16==ip0 */
        offset = (int)(got_slot * sizeof (target_mgreg_t));
#ifdef TARGET_MACH
        /* clang's integrated assembler */
        fprintf (acfg->fp, "adrp x16, %s@PAGE+%d\n", acfg->got_symbol, offset & 0xfffff000);
        fprintf (acfg->fp, "add x16, x16, %s@PAGEOFF\n", acfg->got_symbol);
        fprintf (acfg->fp, "ldr x%d, [x16, #%d]\n", dreg, offset & 0xfff);
#else
        /* Linux GAS */
        fprintf (acfg->fp, "adrp x16, %s+%d\n", acfg->got_symbol, offset & 0xfffff000);
        fprintf (acfg->fp, "add x16, x16, :lo12:%s\n", acfg->got_symbol);
        fprintf (acfg->fp, "ldr x%d, [x16, %d]\n", dreg, offset & 0xfff);
#endif
}

static void
arm64_emit_objc_selector_ref (MonoAotCompile *acfg, guint8 *code, int index, int *code_size)
{
        int reg;

        g_assert (acfg->fp);
        emit_unset_mode (acfg);

        /* ldr rt, target */
        reg = arm_get_ldr_lit_reg (code);

        fprintf (acfg->fp, "adrp x%d, L_OBJC_SELECTOR_REFERENCES_%d@PAGE\n", reg, index);
        fprintf (acfg->fp, "add x%d, x%d, L_OBJC_SELECTOR_REFERENCES_%d@PAGEOFF\n", reg, reg, index);
        fprintf (acfg->fp, "ldr x%d, [x%d]\n", reg, reg);

        *code_size = 12;
}

static void
arm64_emit_direct_call (MonoAotCompile *acfg, const char *target, gboolean external, gboolean thumb, MonoJumpInfo *ji, int *call_size)
{
        g_assert (acfg->fp);
        emit_unset_mode (acfg);
        if (ji && ji->relocation == MONO_R_ARM64_B) {
                fprintf (acfg->fp, "b %s\n", target);
        } else {
                if (ji)
                        g_assert (ji->relocation == MONO_R_ARM64_BL);
                fprintf (acfg->fp, "bl %s\n", target);
        }
        *call_size = 4;
}

static void
arm64_emit_got_access (MonoAotCompile *acfg, guint8 *code, int got_slot, int *code_size)
{
        int reg;

        /* ldr rt, target */
        reg = arm_get_ldr_lit_reg (code);
        arm64_emit_load_got_slot (acfg, reg, got_slot);
        *code_size = 12;
}

static void
arm64_emit_plt_entry (MonoAotCompile *acfg, const char *got_symbol, int offset, int info_offset)
{
        arm64_emit_load_got_slot (acfg, ARMREG_R16, offset / sizeof (target_mgreg_t));
        fprintf (acfg->fp, "br x16\n");
        /* Used by mono_aot_get_plt_info_offset () */
        fprintf (acfg->fp, "%s %d\n", acfg->inst_directive, info_offset);
}

static void
arm64_emit_tramp_page_common_code (MonoAotCompile *acfg, int pagesize, int arg_reg, int *size)
{
        guint8 buf [256];
        guint8 *code;
        int imm;

        /* The common code */
        code = buf;
        imm = pagesize;
        /* The trampoline address is in IP0 */
        arm_movzx (code, ARMREG_IP1, imm & 0xffff, 0);
        arm_movkx (code, ARMREG_IP1, (imm >> 16) & 0xffff, 16);
        /* Compute the data slot address */
        arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_IP1);
        /* Trampoline argument */
        arm_ldrx (code, arg_reg, ARMREG_IP0, 0);
        /* Address */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 8);
        arm_brx (code, ARMREG_IP0);

        /* Emit it */
        emit_code_bytes (acfg, buf, code - buf);

        *size = code - buf;
}

static void
arm64_emit_tramp_page_specific_code (MonoAotCompile *acfg, int pagesize, int common_tramp_size, int specific_tramp_size)
{
        guint8 buf [256];
        guint8 *code;
        int i, count;

        count = (pagesize - common_tramp_size) / specific_tramp_size;
        for (i = 0; i < count; ++i) {
                code = buf;
                arm_adrx (code, ARMREG_IP0, code);
                /* Branch to the generic code */
                arm_b (code, code - 4 - (i * specific_tramp_size) - common_tramp_size);
                /* This has to be 2 pointers long */
                arm_nop (code);
                arm_nop (code);
                g_assert (code - buf == specific_tramp_size);
                emit_code_bytes (acfg, buf, code - buf);
        }
}

static void
arm64_emit_specific_trampoline_pages (MonoAotCompile *acfg)
{
        guint8 buf [128];
        guint8 *code;
        guint8 *labels [16];
        int common_tramp_size;
        int specific_tramp_size = 2 * 8;
        int imm, pagesize;
        char symbol [128];

        if (!acfg->aot_opts.use_trampolines_page)
                return;

#ifdef TARGET_MACH
        /* Have to match the target pagesize */
        pagesize = 16384;
#else
        pagesize = mono_pagesize ();
#endif
        acfg->tramp_page_size = pagesize;

        /* The specific trampolines */
        sprintf (symbol, "%sspecific_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        /* The common code */
        arm64_emit_tramp_page_common_code (acfg, pagesize, ARMREG_IP1, &common_tramp_size);
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_SPECIFIC] = common_tramp_size;

        arm64_emit_tramp_page_specific_code (acfg, pagesize, common_tramp_size, specific_tramp_size);

        /* The rgctx trampolines */
        /* These are the same as the specific trampolines, but they load the argument into MONO_ARCH_RGCTX_REG */
        sprintf (symbol, "%srgctx_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        /* The common code */
        arm64_emit_tramp_page_common_code (acfg, pagesize, MONO_ARCH_RGCTX_REG, &common_tramp_size);
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_STATIC_RGCTX] = common_tramp_size;

        arm64_emit_tramp_page_specific_code (acfg, pagesize, common_tramp_size, specific_tramp_size);

        /* The gsharedvt arg trampolines */
        /* These are the same as the specific trampolines */
        sprintf (symbol, "%sgsharedvt_arg_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        arm64_emit_tramp_page_common_code (acfg, pagesize, ARMREG_IP1, &common_tramp_size);
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_GSHAREDVT_ARG] = common_tramp_size;

        arm64_emit_tramp_page_specific_code (acfg, pagesize, common_tramp_size, specific_tramp_size);

        /* Unbox arbitrary trampolines */
        sprintf (symbol, "%sunbox_arbitrary_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        code = buf;
        imm = pagesize;

        /* Unbox this arg */
        arm_addx_imm (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));

        /* The trampoline address is in IP0 */
        arm_movzx (code, ARMREG_IP1, imm & 0xffff, 0);
        arm_movkx (code, ARMREG_IP1, (imm >> 16) & 0xffff, 16);
        /* Compute the data slot address */
        arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_IP1);
        /* Address */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
        arm_brx (code, ARMREG_IP0);

        /* Emit it */
        emit_code_bytes (acfg, buf, code - buf);

        common_tramp_size = code - buf;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_UNBOX_ARBITRARY] = common_tramp_size;

        arm64_emit_tramp_page_specific_code (acfg, pagesize, common_tramp_size, specific_tramp_size);

        /* The IMT trampolines */
        sprintf (symbol, "%simt_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        code = buf;
        imm = pagesize;
        /* The trampoline address is in IP0 */
        arm_movzx (code, ARMREG_IP1, imm & 0xffff, 0);
        arm_movkx (code, ARMREG_IP1, (imm >> 16) & 0xffff, 16);
        /* Compute the data slot address */
        arm_subx (code, ARMREG_IP0, ARMREG_IP0, ARMREG_IP1);
        /* Trampoline argument */
        arm_ldrx (code, ARMREG_IP1, ARMREG_IP0, 0);

        /* Same as arch_emit_imt_trampoline () */
        labels [0] = code;
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 0);
        arm_cmpx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG);
        labels [1] = code;
        arm_bcc (code, ARMCOND_EQ, 0);

        /* End-of-loop check */
        labels [2] = code;
        arm_cbzx (code, ARMREG_IP0, 0);

        /* Loop footer */
        arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 2 * 8);
        arm_b (code, labels [0]);

        /* Match */
        mono_arm_patch (labels [1], code, MONO_R_ARM64_BCC);
        /* Load vtable slot addr */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 8);
        /* Load vtable slot */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
        arm_brx (code, ARMREG_IP0);

        /* No match */
        mono_arm_patch (labels [2], code, MONO_R_ARM64_CBZ);
        /* Load fail addr */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 8);
        arm_brx (code, ARMREG_IP0);

        emit_code_bytes (acfg, buf, code - buf);

        common_tramp_size = code - buf;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_IMT] = common_tramp_size;

        arm64_emit_tramp_page_specific_code (acfg, pagesize, common_tramp_size, specific_tramp_size);
}

static void
arm64_emit_specific_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
        /* Load argument from second GOT slot */
        arm64_emit_load_got_slot (acfg, ARMREG_R17, offset + 1);
        /* Load generic trampoline address from first GOT slot */
        arm64_emit_load_got_slot (acfg, ARMREG_R16, offset);
        fprintf (acfg->fp, "br x16\n");
        *tramp_size = 7 * 4;
}

static void
arm64_emit_unbox_trampoline (MonoAotCompile *acfg, MonoCompile *cfg, MonoMethod *method, const char *call_target)
{
        emit_unset_mode (acfg);
        fprintf (acfg->fp, "add x0, x0, %d\n", (int)(MONO_ABI_SIZEOF (MonoObject)));
        fprintf (acfg->fp, "b %s\n", call_target);
}

static void
arm64_emit_static_rgctx_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
        /* Similar to the specific trampolines, but use the rgctx reg instead of ip1 */

        /* Load argument from first GOT slot */
        arm64_emit_load_got_slot (acfg, MONO_ARCH_RGCTX_REG, offset);
        /* Load generic trampoline address from second GOT slot */
        arm64_emit_load_got_slot (acfg, ARMREG_R16, offset + 1);
        fprintf (acfg->fp, "br x16\n");
        *tramp_size = 7 * 4;
}

static void
arm64_emit_imt_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
        guint8 buf [128];
        guint8 *code, *labels [16];

        /* Load parameter from GOT slot into ip1 */
        arm64_emit_load_got_slot (acfg, ARMREG_R17, offset);

        code = buf;
        labels [0] = code;
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 0);
        arm_cmpx (code, ARMREG_IP0, MONO_ARCH_RGCTX_REG);
        labels [1] = code;
        arm_bcc (code, ARMCOND_EQ, 0);

        /* End-of-loop check */
        labels [2] = code;
        arm_cbzx (code, ARMREG_IP0, 0);

        /* Loop footer */
        arm_addx_imm (code, ARMREG_IP1, ARMREG_IP1, 2 * 8);
        arm_b (code, labels [0]);

        /* Match */
        mono_arm_patch (labels [1], code, MONO_R_ARM64_BCC);
        /* Load vtable slot addr */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 8);
        /* Load vtable slot */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP0, 0);
        arm_brx (code, ARMREG_IP0);

        /* No match */
        mono_arm_patch (labels [2], code, MONO_R_ARM64_CBZ);
        /* Load fail addr */
        arm_ldrx (code, ARMREG_IP0, ARMREG_IP1, 8);
        arm_brx (code, ARMREG_IP0);

        emit_code_bytes (acfg, buf, code - buf);

        *tramp_size = code - buf + (3 * 4);
}

static void
arm64_emit_gsharedvt_arg_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
        /* Similar to the specific trampolines, but the address is in the second slot */
        /* Load argument from first GOT slot */
        arm64_emit_load_got_slot (acfg, ARMREG_R17, offset);
        /* Load generic trampoline address from second GOT slot */
        arm64_emit_load_got_slot (acfg, ARMREG_R16, offset + 1);
        fprintf (acfg->fp, "br x16\n");
        *tramp_size = 7 * 4;
}


#endif

#ifdef MONO_ARCH_AOT_SUPPORTED
/*
 * arch_emit_direct_call:
 *
 *   Emit a direct call to the symbol TARGET. CALL_SIZE is set to the size of the
 * calling code.
 */
static void
arch_emit_direct_call (MonoAotCompile *acfg, const char *target, gboolean external, gboolean thumb, MonoJumpInfo *ji, int *call_size)
{
#if defined(TARGET_X86) || defined(TARGET_AMD64)
        /* Need to make sure this is exactly 5 bytes long */
        emit_unset_mode (acfg);
        fprintf (acfg->fp, "call %s\n", target);
        *call_size = 5;
#elif defined(TARGET_ARM)
        emit_unset_mode (acfg);
        if (thumb)
                fprintf (acfg->fp, "blx %s\n", target);
        else
                fprintf (acfg->fp, "bl %s\n", target);
        *call_size = 4;
#elif defined(TARGET_ARM64)
        arm64_emit_direct_call (acfg, target, external, thumb, ji, call_size);
#elif defined(TARGET_POWERPC)
        emit_unset_mode (acfg);
        fprintf (acfg->fp, "bl %s\n", target);
        *call_size = 4;
#else
        g_assert_not_reached ();
#endif
}
#endif

/*
 * PPC32 design:
 * - we use an approach similar to the x86 abi: reserve a register (r30) to hold 
 *   the GOT pointer.
 * - The full-aot trampolines need access to the GOT of mscorlib, so we store
 *   in in the 2. slot of every GOT, and require every method to place the GOT
 *   address in r30, even when it doesn't access the GOT otherwise. This way,
 *   the trampolines can compute the mscorlib GOT address by loading 4(r30).
 */

/*
 * PPC64 design:
 * PPC64 uses function descriptors which greatly complicate all code, since
 * these are used very inconsistently in the runtime. Some functions like 
 * mono_compile_method () return ftn descriptors, while others like the
 * trampoline creation functions do not.
 * We assume that all GOT slots contain function descriptors, and create 
 * descriptors in aot-runtime.c when needed.
 * The ppc64 abi uses r2 to hold the address of the TOC/GOT, which is loaded
 * from function descriptors, we could do the same, but it would require 
 * rewriting all the ppc/aot code to handle function descriptors properly.
 * So instead, we use the same approach as on PPC32.
 * This is a horrible mess, but fixing it would probably lead to an even bigger
 * one.
 */

/*
 * X86 design:
 * - similar to the PPC32 design, we reserve EBX to hold the GOT pointer.
 */

#ifdef MONO_ARCH_AOT_SUPPORTED
/*
 * arch_emit_got_offset:
 *
 *   The memory pointed to by CODE should hold native code for computing the GOT
 * address (OP_LOAD_GOTADDR). Emit this code while patching it with the offset
 * between code and the GOT. CODE_SIZE is set to the number of bytes emitted.
 */
static void
arch_emit_got_offset (MonoAotCompile *acfg, guint8 *code, int *code_size)
{
#if defined(TARGET_POWERPC64)
        emit_unset_mode (acfg);
        /* 
         * The ppc32 code doesn't seem to work on ppc64, the assembler complains about
         * unsupported relocations. So we store the got address into the .Lgot_addr
         * symbol which is in the text segment, compute its address, and load it.
         */
        fprintf (acfg->fp, ".L%d:\n", acfg->label_generator);
        fprintf (acfg->fp, "lis 0, (.Lgot_addr + 4 - .L%d)@h\n", acfg->label_generator);
        fprintf (acfg->fp, "ori 0, 0, (.Lgot_addr + 4 - .L%d)@l\n", acfg->label_generator);
        fprintf (acfg->fp, "add 30, 30, 0\n");
        fprintf (acfg->fp, "%s 30, 0(30)\n", PPC_LD_OP);
        acfg->label_generator ++;
        *code_size = 16;
#elif defined(TARGET_POWERPC)
        emit_unset_mode (acfg);
        fprintf (acfg->fp, ".L%d:\n", acfg->label_generator);
        fprintf (acfg->fp, "lis 0, (%s + 4 - .L%d)@h\n", acfg->got_symbol, acfg->label_generator);
        fprintf (acfg->fp, "ori 0, 0, (%s + 4 - .L%d)@l\n", acfg->got_symbol, acfg->label_generator);
        acfg->label_generator ++;
        *code_size = 8;
#else
        guint32 offset = mono_arch_get_patch_offset (code);
        emit_bytes (acfg, code, offset);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", offset);

        *code_size = offset + 4;
#endif
}

/*
 * arch_emit_got_access:
 *
 *   The memory pointed to by CODE should hold native code for loading a GOT
 * slot (OP_AOTCONST/OP_GOT_ENTRY). Emit this code while patching it so it accesses the
 * GOT slot GOT_SLOT. CODE_SIZE is set to the number of bytes emitted.
 */
static void
arch_emit_got_access (MonoAotCompile *acfg, const char *got_symbol, guint8 *code, int got_slot, int *code_size)
{
#ifdef TARGET_AMD64
        /* mov reg, got+offset(%rip) */
        if (acfg->llvm) {
                /* The GOT symbol is in the LLVM module, the clang assembler has problems emitting symbol diffs for it */
                int dreg;
                int rex_r;

                /* Decode reg, see amd64_mov_reg_membase () */
                rex_r = code [0] & AMD64_REX_R;
                g_assert (code [0] == 0x49 + rex_r);
                g_assert (code [1] == 0x8b);
                dreg = ((code [2] >> 3) & 0x7) + (rex_r ? 8 : 0);

                emit_unset_mode (acfg);
                fprintf (acfg->fp, "mov %s+%d(%%rip), %s\n", got_symbol, (unsigned int) ((got_slot * sizeof (target_mgreg_t))), mono_arch_regname (dreg));
                *code_size = 7;
        } else {
                emit_bytes (acfg, code, mono_arch_get_patch_offset (code));
                emit_symbol_diff (acfg, got_symbol, ".", (unsigned int) ((got_slot * sizeof (target_mgreg_t)) - 4));
                *code_size = mono_arch_get_patch_offset (code) + 4;
        }
#elif defined(TARGET_X86)
        emit_bytes (acfg, code, mono_arch_get_patch_offset (code));
        emit_int32 (acfg, (unsigned int) ((got_slot * sizeof (target_mgreg_t))));
        *code_size = mono_arch_get_patch_offset (code) + 4;
#elif defined(TARGET_ARM)
        emit_bytes (acfg, code, mono_arch_get_patch_offset (code));
        emit_symbol_diff (acfg, got_symbol, ".", (unsigned int) ((got_slot * sizeof (target_mgreg_t))) - 12);
        *code_size = mono_arch_get_patch_offset (code) + 4;
#elif defined(TARGET_ARM64)
        emit_bytes (acfg, code, mono_arch_get_patch_offset (code));
        arm64_emit_got_access (acfg, code, got_slot, code_size);
#elif defined(TARGET_POWERPC)
        {
                guint8 buf [32];

                emit_bytes (acfg, code, mono_arch_get_patch_offset (code));
                code = buf;
                ppc_load32 (code, ppc_r0, got_slot * sizeof (target_mgreg_t));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
                *code_size = code - buf;
        }
#else
        g_assert_not_reached ();
#endif
}

#endif

#ifdef MONO_ARCH_AOT_SUPPORTED
/*
 * arch_emit_objc_selector_ref:
 *
 *   Emit the implementation of OP_OBJC_GET_SELECTOR, which itself implements @selector(foo:) in objective-c.
 */
static void
arch_emit_objc_selector_ref (MonoAotCompile *acfg, guint8 *code, int index, int *code_size)
{
#if defined(TARGET_ARM)
        char symbol1 [MAX_SYMBOL_SIZE];
        char symbol2 [MAX_SYMBOL_SIZE];
        int lindex = acfg->objc_selector_index_2 ++;

        /* Emit ldr.imm/b */
        emit_bytes (acfg, code, 8);

        sprintf (symbol1, "L_OBJC_SELECTOR_%d", lindex);
        sprintf (symbol2, "L_OBJC_SELECTOR_REFERENCES_%d", index);

        emit_label (acfg, symbol1);
        mono_img_writer_emit_unset_mode (acfg->w);
        fprintf (acfg->fp, ".long %s-(%s+12)", symbol2, symbol1);

        *code_size = 12;
#elif defined(TARGET_ARM64)
        arm64_emit_objc_selector_ref (acfg, code, index, code_size);
#else
        g_assert_not_reached ();
#endif
}
#endif

/*
 * arch_emit_plt_entry:
 *
 *   Emit code for the PLT entry.
 * The plt entry should look like this:
 * <indirect jump to GOT_SYMBOL + OFFSET>
 * <INFO_OFFSET embedded into the instruction stream>
 */
static void
arch_emit_plt_entry (MonoAotCompile *acfg, const char *got_symbol, int offset, int info_offset)
{
#if defined(TARGET_X86)
                /* jmp *<offset>(%ebx) */
                emit_byte (acfg, 0xff);
                emit_byte (acfg, 0xa3);
                emit_int32 (acfg, offset);
                /* Used by mono_aot_get_plt_info_offset */
                emit_int32 (acfg, info_offset);
#elif defined(TARGET_AMD64)
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "jmp *%s+%d(%%rip)\n", got_symbol, offset);
                /* Used by mono_aot_get_plt_info_offset */
                emit_int32 (acfg, info_offset);
                acfg->stats.plt_size += 10;
#elif defined(TARGET_ARM)
                guint8 buf [256];
                guint8 *code;

                code = buf;
                ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
                ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_IP);
                emit_bytes (acfg, buf, code - buf);
                emit_symbol_diff (acfg, got_symbol, ".", offset - 4);
                /* Used by mono_aot_get_plt_info_offset */
                emit_int32 (acfg, info_offset);
#elif defined(TARGET_ARM64)
                arm64_emit_plt_entry (acfg, got_symbol, offset, info_offset);
#elif defined(TARGET_POWERPC)
                /* The GOT address is guaranteed to be in r30 by OP_LOAD_GOTADDR */
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "lis 11, %d@h\n", offset);
                fprintf (acfg->fp, "ori 11, 11, %d@l\n", offset);
                fprintf (acfg->fp, "add 11, 11, 30\n");
                fprintf (acfg->fp, "%s 11, 0(11)\n", PPC_LD_OP);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
                fprintf (acfg->fp, "%s 2, %d(11)\n", PPC_LD_OP, (int)sizeof (target_mgreg_t));
                fprintf (acfg->fp, "%s 11, 0(11)\n", PPC_LD_OP);
#endif
                fprintf (acfg->fp, "mtctr 11\n");
                fprintf (acfg->fp, "bctr\n");
                emit_int32 (acfg, info_offset);
#else
                g_assert_not_reached ();
#endif
}

/*
 * arch_emit_llvm_plt_entry:
 *
 *   Same as arch_emit_plt_entry, but handles calls from LLVM generated code.
 * This is only needed on arm to handle thumb interop.
 */
static void
arch_emit_llvm_plt_entry (MonoAotCompile *acfg, const char *got_symbol, int offset, int info_offset)
{
#if defined(TARGET_ARM)
        /* LLVM calls the PLT entries using bl, so these have to be thumb2 */
        /* The caller already transitioned to thumb */
        /* The code below should be 12 bytes long */
        /* clang has trouble encoding these instructions, so emit the binary */
#if 0
        fprintf (acfg->fp, "ldr ip, [pc, #8]\n");
        /* thumb can't encode ld pc, [pc, ip] */
        fprintf (acfg->fp, "add ip, pc, ip\n");
        fprintf (acfg->fp, "ldr ip, [ip, #0]\n");
        fprintf (acfg->fp, "bx ip\n");
#endif
        emit_set_thumb_mode (acfg);
        fprintf (acfg->fp, ".4byte 0xc008f8df\n");
        fprintf (acfg->fp, ".2byte 0x44fc\n");
        fprintf (acfg->fp, ".4byte 0xc000f8dc\n");
        fprintf (acfg->fp, ".2byte 0x4760\n");
        emit_symbol_diff (acfg, got_symbol, ".", offset + 4);
        emit_int32 (acfg, info_offset);
        emit_unset_mode (acfg);
        emit_set_arm_mode (acfg);
#else
        g_assert_not_reached ();
#endif
}

/* Save unwind_info in the module and emit the offset to the information at symbol */
static void save_unwind_info (MonoAotCompile *acfg, char *symbol, GSList *unwind_ops)
{
        guint32 uw_offset, encoded_len;
        guint8 *encoded;

        emit_section_change (acfg, RODATA_SECT, 0);
        emit_global (acfg, symbol, FALSE);
        emit_label (acfg, symbol);

        encoded = mono_unwind_ops_encode (unwind_ops, &encoded_len);
        uw_offset = get_unwind_info_offset (acfg, encoded, encoded_len);
        g_free (encoded);
        emit_int32 (acfg, uw_offset);
}

/*
 * arch_emit_specific_trampoline_pages:
 *
 * Emits a page full of trampolines: each trampoline uses its own address to
 * lookup both the generic trampoline code and the data argument.
 * This page can be remapped in process multiple times so we can get an
 * unlimited number of trampolines.
 * Specifically this implementation uses the following trick: two memory pages
 * are allocated, with the first containing the data and the second containing the trampolines.
 * To reduce trampoline size, each trampoline jumps at the start of the page where a common
 * implementation does all the lifting.
 * Note that the ARM single trampoline size is 8 bytes, exactly like the data that needs to be stored
 * on the arm 32 bit system.
 */
static void
arch_emit_specific_trampoline_pages (MonoAotCompile *acfg)
{
#if defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;
        guint8 *loop_start, *loop_branch_back, *loop_end_check, *imt_found_check;
        int i;
        int pagesize = MONO_AOT_TRAMP_PAGE_SIZE;
        GSList *unwind_ops = NULL;
#define COMMON_TRAMP_SIZE 16
        int count = (pagesize - COMMON_TRAMP_SIZE) / 8;
        int imm8, rot_amount;
        char symbol [128];

        if (!acfg->aot_opts.use_trampolines_page)
                return;

        acfg->tramp_page_size = pagesize;

        sprintf (symbol, "%sspecific_trampolines_page", acfg->user_symbol_prefix);
        emit_alignment (acfg, pagesize);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);

        /* emit the generic code first, the trampoline address + 8 is in the lr register */
        code = buf;
        imm8 = mono_arm_is_rotated_imm8 (pagesize, &rot_amount);
        ARM_SUB_REG_IMM (code, ARMREG_LR, ARMREG_LR, imm8, rot_amount);
        ARM_LDR_IMM (code, ARMREG_R1, ARMREG_LR, -8);
        ARM_LDR_IMM (code, ARMREG_PC, ARMREG_LR, -4);
        ARM_NOP (code);
        g_assert (code - buf == COMMON_TRAMP_SIZE);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);

        for (i = 0; i < count; ++i) {
                code = buf;
                ARM_PUSH (code, 0x5fff);
                ARM_BL (code, 0);
                arm_patch (code - 4, code - COMMON_TRAMP_SIZE - 8 * (i + 1));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
        }

        /* now the rgctx trampolines: each specific trampolines puts in the ip register
         * the instruction pointer address, so the generic trampoline at the start of the page
         * subtracts 4096 to get to the data page and loads the values
         * We again fit the generic trampiline in 16 bytes.
         */
        sprintf (symbol, "%srgctx_trampolines_page", acfg->user_symbol_prefix);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);
        code = buf;
        imm8 = mono_arm_is_rotated_imm8 (pagesize, &rot_amount);
        ARM_SUB_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
        ARM_LDR_IMM (code, MONO_ARCH_RGCTX_REG, ARMREG_IP, -8);
        ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, -4);
        ARM_NOP (code);
        g_assert (code - buf == COMMON_TRAMP_SIZE);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);

        for (i = 0; i < count; ++i) {
                code = buf;
                ARM_MOV_REG_REG (code, ARMREG_IP, ARMREG_PC);
                ARM_B (code, 0);
                arm_patch (code - 4, code - COMMON_TRAMP_SIZE - 8 * (i + 1));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
        }

        /*
         * gsharedvt arg trampolines: see arch_emit_gsharedvt_arg_trampoline ()
         */
        sprintf (symbol, "%sgsharedvt_arg_trampolines_page", acfg->user_symbol_prefix);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);
        code = buf;
        ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3));
        imm8 = mono_arm_is_rotated_imm8 (pagesize, &rot_amount);
        ARM_SUB_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_IP, -8);
        ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, -4);
        g_assert (code - buf == COMMON_TRAMP_SIZE);
        /* Emit it */
        emit_bytes (acfg, buf, code - buf);

        for (i = 0; i < count; ++i) {
                code = buf;
                ARM_MOV_REG_REG (code, ARMREG_IP, ARMREG_PC);
                ARM_B (code, 0);
                arm_patch (code - 4, code - COMMON_TRAMP_SIZE - 8 * (i + 1));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
        }

        /* now the unbox arbitrary trampolines: each specific trampolines puts in the ip register
         * the instruction pointer address, so the generic trampoline at the start of the page
         * subtracts 4096 to get to the data page and loads the target addr.
         * We again fit the generic trampoline in 16 bytes.
         */
        sprintf (symbol, "%sunbox_arbitrary_trampolines_page", acfg->user_symbol_prefix);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);
        code = buf;

        ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));
        imm8 = mono_arm_is_rotated_imm8 (pagesize, &rot_amount);
        ARM_SUB_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
        ARM_LDR_IMM (code, ARMREG_PC, ARMREG_IP, -4);
        ARM_NOP (code);
        g_assert (code - buf == COMMON_TRAMP_SIZE);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);

        for (i = 0; i < count; ++i) {
                code = buf;
                ARM_MOV_REG_REG (code, ARMREG_IP, ARMREG_PC);
                ARM_B (code, 0);
                arm_patch (code - 4, code - COMMON_TRAMP_SIZE - 8 * (i + 1));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
        }

        /* now the imt trampolines: each specific trampolines puts in the ip register
         * the instruction pointer address, so the generic trampoline at the start of the page
         * subtracts 4096 to get to the data page and loads the values
         */
#define IMT_TRAMP_SIZE 72
        sprintf (symbol, "%simt_trampolines_page", acfg->user_symbol_prefix);
        emit_global (acfg, symbol, TRUE);
        emit_label (acfg, symbol);
        code = buf;
        /* Need at least two free registers, plus a slot for storing the pc */
        ARM_PUSH (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_R2));

        imm8 = mono_arm_is_rotated_imm8 (pagesize, &rot_amount);
        ARM_SUB_REG_IMM (code, ARMREG_IP, ARMREG_IP, imm8, rot_amount);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_IP, -8);

        /* The IMT method is in v5, r0 has the imt array address */

        loop_start = code;
        ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, 0);
        ARM_CMP_REG_REG (code, ARMREG_R1, ARMREG_V5);
        imt_found_check = code;
        ARM_B_COND (code, ARMCOND_EQ, 0);

        /* End-of-loop check */
        ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
        loop_end_check = code;
        ARM_B_COND (code, ARMCOND_EQ, 0);

        /* Loop footer */
        ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (target_mgreg_t) * 2);
        loop_branch_back = code;
        ARM_B (code, 0);
        arm_patch (loop_branch_back, loop_start);

        /* Match */
        arm_patch (imt_found_check, code);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 4);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 0);
        /* Save it to the third stack slot */
        ARM_STR_IMM (code, ARMREG_R0, ARMREG_SP, 8);
        /* Restore the registers and branch */
        ARM_POP (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_PC));

        /* No match */
        arm_patch (loop_end_check, code);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 4);
        ARM_STR_IMM (code, ARMREG_R0, ARMREG_SP, 8);
        ARM_POP (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_PC));
        ARM_NOP (code);

        /* Emit it */
        g_assert (code - buf == IMT_TRAMP_SIZE);
        emit_bytes (acfg, buf, code - buf);

        for (i = 0; i < count; ++i) {
                code = buf;
                ARM_MOV_REG_REG (code, ARMREG_IP, ARMREG_PC);
                ARM_B (code, 0);
                arm_patch (code - 4, code - IMT_TRAMP_SIZE - 8 * (i + 1));
                g_assert (code - buf == 8);
                emit_bytes (acfg, buf, code - buf);
        }

        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_SPECIFIC] = 16;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_STATIC_RGCTX] = 16;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_IMT] = 72;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_GSHAREDVT_ARG] = 16;
        acfg->tramp_page_code_offsets [MONO_AOT_TRAMP_UNBOX_ARBITRARY] = 16;

        /* Unwind info for specifc trampolines */
        sprintf (symbol, "%sspecific_trampolines_page_gen_p", acfg->user_symbol_prefix);
        /* We unwind to the original caller, from the stack, since lr is clobbered */
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 14 * sizeof (target_mgreg_t));
        mono_add_unwind_op_offset (unwind_ops, 0, 0, ARMREG_LR, -4);
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        sprintf (symbol, "%sspecific_trampolines_page_sp_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        mono_add_unwind_op_def_cfa_offset (unwind_ops, 4, 0, 14 * sizeof (target_mgreg_t));
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        /* Unwind info for rgctx trampolines */
        sprintf (symbol, "%srgctx_trampolines_page_gen_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        save_unwind_info (acfg, symbol, unwind_ops);

        sprintf (symbol, "%srgctx_trampolines_page_sp_p", acfg->user_symbol_prefix);
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        /* Unwind info for gsharedvt trampolines */
        sprintf (symbol, "%sgsharedvt_trampolines_page_gen_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        mono_add_unwind_op_def_cfa_offset (unwind_ops, 4, 0, 4 * sizeof (target_mgreg_t));
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        sprintf (symbol, "%sgsharedvt_trampolines_page_sp_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        /* Unwind info for unbox arbitrary trampolines */
        sprintf (symbol, "%sunbox_arbitrary_trampolines_page_gen_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        save_unwind_info (acfg, symbol, unwind_ops);

        sprintf (symbol, "%sunbox_arbitrary_trampolines_page_sp_p", acfg->user_symbol_prefix);
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        /* Unwind info for imt trampolines */
        sprintf (symbol, "%simt_trampolines_page_gen_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        mono_add_unwind_op_def_cfa_offset (unwind_ops, 4, 0, 3 * sizeof (target_mgreg_t));
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);

        sprintf (symbol, "%simt_trampolines_page_sp_p", acfg->user_symbol_prefix);
        mono_add_unwind_op_def_cfa (unwind_ops, 0, 0, ARMREG_SP, 0);
        save_unwind_info (acfg, symbol, unwind_ops);
        mono_free_unwind_info (unwind_ops);
#elif defined(TARGET_ARM64)
        arm64_emit_specific_trampoline_pages (acfg);
#endif
}

/*
 * arch_emit_specific_trampoline:
 *
 *   Emit code for a specific trampoline. OFFSET is the offset of the first of
 * two GOT slots which contain the generic trampoline address and the trampoline
 * argument. TRAMP_SIZE is set to the size of the emitted trampoline.
 */
static void
arch_emit_specific_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
        /*
         * The trampolines created here are variations of the specific 
         * trampolines created in mono_arch_create_specific_trampoline (). The 
         * differences are:
         * - the generic trampoline address is taken from a got slot.
         * - the offset of the got slot where the trampoline argument is stored
         *   is embedded in the instruction stream, and the generic trampoline
         *   can load the argument by loading the offset, adding it to the
         *   address of the trampoline to get the address of the got slot, and
         *   loading the argument from there.
         * - all the trampolines should be of the same length.
         */
#if defined(TARGET_AMD64)
        /* This should be exactly 8 bytes long */
        *tramp_size = 8;
        /* call *<offset>(%rip) */
        if (acfg->llvm) {
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "call *%s+%d(%%rip)\n", acfg->got_symbol, (int)(offset * sizeof (target_mgreg_t)));
                emit_zero_bytes (acfg, 2);
        } else {
                emit_byte (acfg, '\x41');
                emit_byte (acfg, '\xff');
                emit_byte (acfg, '\x15');
                emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) - 4);
                emit_zero_bytes (acfg, 1);
        }
#elif defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;

        /* This should be exactly 20 bytes long */
        *tramp_size = 20;
        code = buf;
        ARM_PUSH (code, 0x5fff);
        ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 4);
        /* Load the value from the GOT */
        ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_PC, ARMREG_R1);
        /* Branch to it */
        ARM_BLX_REG (code, ARMREG_R1);

        g_assert (code - buf == 16);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);
        /* 
         * Only one offset is needed, since the second one would be equal to the
         * first one.
         */
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) - 4 + 4);
        //emit_symbol_diff (acfg, acfg->got_symbol, ".", ((offset + 1) * sizeof (target_mgreg_t)) - 4 + 8);
#elif defined(TARGET_ARM64)
        arm64_emit_specific_trampoline (acfg, offset, tramp_size);
#elif defined(TARGET_POWERPC)
        guint8 buf [128];
        guint8 *code;

        *tramp_size = 4;
        code = buf;

        /*
         * PPC has no ip relative addressing, so we need to compute the address
         * of the mscorlib got. That is slow and complex, so instead, we store it
         * in the second got slot of every aot image. The caller already computed
         * the address of its got and placed it into r30.
         */
        emit_unset_mode (acfg);
        /* Load mscorlib got address */
        fprintf (acfg->fp, "%s 0, %d(30)\n", PPC_LD_OP, (int)sizeof (target_mgreg_t));
        /* Load generic trampoline address */
        fprintf (acfg->fp, "lis 11, %d@h\n", (int)(offset * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "ori 11, 11, %d@l\n", (int)(offset * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "%s 11, 11, 0\n", PPC_LDX_OP);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
        fprintf (acfg->fp, "%s 11, 0(11)\n", PPC_LD_OP);
#endif
        fprintf (acfg->fp, "mtctr 11\n");
        /* Load trampoline argument */
        /* On ppc, we pass it normally to the generic trampoline */
        fprintf (acfg->fp, "lis 11, %d@h\n", (int)((offset + 1) * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "ori 11, 11, %d@l\n", (int)((offset + 1) * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "%s 0, 11, 0\n", PPC_LDX_OP);
        /* Branch to generic trampoline */
        fprintf (acfg->fp, "bctr\n");

#ifdef PPC_USES_FUNCTION_DESCRIPTOR
        *tramp_size = 10 * 4;
#else
        *tramp_size = 9 * 4;
#endif
#elif defined(TARGET_X86)
        guint8 buf [128];
        guint8 *code;

        /* Similar to the PPC code above */

        /* FIXME: Could this clobber the register needed by get_vcall_slot () ? */

        code = buf;
        /* Load mscorlib got address */
        x86_mov_reg_membase (code, X86_ECX, MONO_ARCH_GOT_REG, sizeof (target_mgreg_t), 4);
        /* Push trampoline argument */
        x86_push_membase (code, X86_ECX, (offset + 1) * sizeof (target_mgreg_t));
        /* Load generic trampoline address */
        x86_mov_reg_membase (code, X86_ECX, X86_ECX, offset * sizeof (target_mgreg_t), 4);
        /* Branch to generic trampoline */
        x86_jump_reg (code, X86_ECX);

        emit_bytes (acfg, buf, code - buf);

        *tramp_size = 17;
        g_assert (code - buf == *tramp_size);
#else
        g_assert_not_reached ();
#endif
}

/*
 * arch_emit_unbox_trampoline:
 *
 *   Emit code for the unbox trampoline for METHOD used in the full-aot case.
 * CALL_TARGET is the symbol pointing to the native code of METHOD.
 *
 * See mono_aot_get_unbox_trampoline.
 */
static void
arch_emit_unbox_trampoline (MonoAotCompile *acfg, MonoCompile *cfg, MonoMethod *method, const char *call_target)
{
#if defined(TARGET_AMD64)
        guint8 buf [32];
        guint8 *code;
        int this_reg;

        this_reg = mono_arch_get_this_arg_reg (NULL);
        code = buf;
        amd64_alu_reg_imm (code, X86_ADD, this_reg, MONO_ABI_SIZEOF (MonoObject));

        emit_bytes (acfg, buf, code - buf);
        /* jump <method> */
        if (acfg->llvm) {
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "jmp %s\n", call_target);
        } else {
                emit_byte (acfg, '\xe9');
                emit_symbol_diff (acfg, call_target, ".", -4);
        }
#elif defined(TARGET_X86)
        guint8 buf [32];
        guint8 *code;
        int this_pos = 4;

        code = buf;

        x86_alu_membase_imm (code, X86_ADD, X86_ESP, this_pos, MONO_ABI_SIZEOF (MonoObject));

        emit_bytes (acfg, buf, code - buf);

        /* jump <method> */
        emit_byte (acfg, '\xe9');
        emit_symbol_diff (acfg, call_target, ".", -4);
#elif defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;

        if (acfg->thumb_mixed && cfg->compile_llvm) {
                fprintf (acfg->fp, "add r0, r0, #%d\n", (int)MONO_ABI_SIZEOF (MonoObject));
                fprintf (acfg->fp, "b %s\n", call_target);
                fprintf (acfg->fp, ".arm\n");
                fprintf (acfg->fp, ".align 2\n");
                return;
        }

        code = buf;

        ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));

        emit_bytes (acfg, buf, code - buf);
        /* jump to method */
        if (acfg->thumb_mixed && cfg->compile_llvm)
                fprintf (acfg->fp, "\n\tbx %s\n", call_target);
        else
                fprintf (acfg->fp, "\n\tb %s\n", call_target);
#elif defined(TARGET_ARM64)
        arm64_emit_unbox_trampoline (acfg, cfg, method, call_target);
#elif defined(TARGET_POWERPC)
        int this_pos = 3;

        fprintf (acfg->fp, "\n\taddi %d, %d, %d\n", this_pos, this_pos, (int)MONO_ABI_SIZEOF (MonoObject));
        fprintf (acfg->fp, "\n\tb %s\n", call_target);
#else
        g_assert_not_reached ();
#endif
}

/*
 * arch_emit_static_rgctx_trampoline:
 *
 *   Emit code for a static rgctx trampoline. OFFSET is the offset of the first of
 * two GOT slots which contain the rgctx argument, and the method to jump to.
 * TRAMP_SIZE is set to the size of the emitted trampoline.
 * These kinds of trampolines cannot be enumerated statically, since there could
 * be one trampoline per method instantiation, so we emit the same code for all
 * trampolines, and parameterize them using two GOT slots.
 */
static void
arch_emit_static_rgctx_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
#if defined(TARGET_AMD64)
        /* This should be exactly 13 bytes long */
        *tramp_size = 13;

        if (acfg->llvm) {
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "mov %s+%d(%%rip), %%r10\n", acfg->got_symbol, (int)(offset * sizeof (target_mgreg_t)));
                fprintf (acfg->fp, "jmp *%s+%d(%%rip)\n", acfg->got_symbol, (int)((offset + 1) * sizeof (target_mgreg_t)));
        } else {
                /* mov <OFFSET>(%rip), %r10 */
                emit_byte (acfg, '\x4d');
                emit_byte (acfg, '\x8b');
                emit_byte (acfg, '\x15');
                emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) - 4);

                /* jmp *<offset>(%rip) */
                emit_byte (acfg, '\xff');
                emit_byte (acfg, '\x25');
                emit_symbol_diff (acfg, acfg->got_symbol, ".", ((offset + 1) * sizeof (target_mgreg_t)) - 4);
        }
#elif defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;

        /* This should be exactly 24 bytes long */
        *tramp_size = 24;
        code = buf;
        /* Load rgctx value */
        ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
        ARM_LDR_REG_REG (code, MONO_ARCH_RGCTX_REG, ARMREG_PC, ARMREG_IP);
        /* Load branch addr + branch */
        ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 4);
        ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_IP);

        g_assert (code - buf == 16);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) - 4 + 8);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", ((offset + 1) * sizeof (target_mgreg_t)) - 4 + 4);
#elif defined(TARGET_ARM64)
        arm64_emit_static_rgctx_trampoline (acfg, offset, tramp_size);
#elif defined(TARGET_POWERPC)
        guint8 buf [128];
        guint8 *code;

        *tramp_size = 4;
        code = buf;

        /*
         * PPC has no ip relative addressing, so we need to compute the address
         * of the mscorlib got. That is slow and complex, so instead, we store it
         * in the second got slot of every aot image. The caller already computed
         * the address of its got and placed it into r30.
         */
        emit_unset_mode (acfg);
        /* Load mscorlib got address */
        fprintf (acfg->fp, "%s 0, %d(30)\n", PPC_LD_OP, (int)sizeof (target_mgreg_t));
        /* Load rgctx */
        fprintf (acfg->fp, "lis 11, %d@h\n", (int)(offset * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "ori 11, 11, %d@l\n", (int)(offset * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "%s %d, 11, 0\n", PPC_LDX_OP, MONO_ARCH_RGCTX_REG);
        /* Load target address */
        fprintf (acfg->fp, "lis 11, %d@h\n", (int)((offset + 1) * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "ori 11, 11, %d@l\n", (int)((offset + 1) * sizeof (target_mgreg_t)));
        fprintf (acfg->fp, "%s 11, 11, 0\n", PPC_LDX_OP);
#ifdef PPC_USES_FUNCTION_DESCRIPTOR
        fprintf (acfg->fp, "%s 2, %d(11)\n", PPC_LD_OP, (int)sizeof (target_mgreg_t));
        fprintf (acfg->fp, "%s 11, 0(11)\n", PPC_LD_OP);
#endif
        fprintf (acfg->fp, "mtctr 11\n");
        /* Branch to the target address */
        fprintf (acfg->fp, "bctr\n");

#ifdef PPC_USES_FUNCTION_DESCRIPTOR
        *tramp_size = 11 * 4;
#else
        *tramp_size = 9 * 4;
#endif

#elif defined(TARGET_X86)
        guint8 buf [128];
        guint8 *code;

        /* Similar to the PPC code above */

        g_assert (MONO_ARCH_RGCTX_REG != X86_ECX);

        code = buf;
        /* Load mscorlib got address */
        x86_mov_reg_membase (code, X86_ECX, MONO_ARCH_GOT_REG, sizeof (target_mgreg_t), 4);
        /* Load arg */
        x86_mov_reg_membase (code, MONO_ARCH_RGCTX_REG, X86_ECX, offset * sizeof (target_mgreg_t), 4);
        /* Branch to the target address */
        x86_jump_membase (code, X86_ECX, (offset + 1) * sizeof (target_mgreg_t));

        emit_bytes (acfg, buf, code - buf);

        *tramp_size = 15;
        g_assert (code - buf == *tramp_size);
#else
        g_assert_not_reached ();
#endif
}       

/*
 * arch_emit_imt_trampoline:
 *
 *   Emit an IMT trampoline usable in full-aot mode. The trampoline uses 1 got slot which
 * points to an array of pointer pairs. The pairs of the form [key, ptr], where
 * key is the IMT key, and ptr holds the address of a memory location holding
 * the address to branch to if the IMT arg matches the key. The array is 
 * terminated by a pair whose key is NULL, and whose ptr is the address of the 
 * fail_tramp.
 * TRAMP_SIZE is set to the size of the emitted trampoline.
 */
static void
arch_emit_imt_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
#if defined(TARGET_AMD64)
        guint8 *buf, *code;
        guint8 *labels [16];
        guint8 mov_buf[3];
        guint8 *mov_buf_ptr = mov_buf;

        const int kSizeOfMove = 7;

        code = buf = (guint8 *)g_malloc (256);

        /* FIXME: Optimize this, i.e. use binary search etc. */
        /* Maybe move the body into a separate function (slower, but much smaller) */

        /* MONO_ARCH_IMT_SCRATCH_REG is a free register */

        if (acfg->llvm) {
                emit_unset_mode (acfg);
                fprintf (acfg->fp, "mov %s+%d(%%rip), %s\n", acfg->got_symbol, (int)(offset * sizeof (target_mgreg_t)), mono_arch_regname (MONO_ARCH_IMT_SCRATCH_REG));
        }

        labels [0] = code;
        amd64_alu_membase_imm (code, X86_CMP, MONO_ARCH_IMT_SCRATCH_REG, 0, 0);
        labels [1] = code;
        amd64_branch8 (code, X86_CC_Z, 0, FALSE);

        /* Check key */
        amd64_alu_membase_reg_size (code, X86_CMP, MONO_ARCH_IMT_SCRATCH_REG, 0, MONO_ARCH_IMT_REG, sizeof (target_mgreg_t));
        labels [2] = code;
        amd64_branch8 (code, X86_CC_Z, 0, FALSE);

        /* Loop footer */
        amd64_alu_reg_imm (code, X86_ADD, MONO_ARCH_IMT_SCRATCH_REG, 2 * sizeof (target_mgreg_t));
        amd64_jump_code (code, labels [0]);

        /* Match */
        mono_amd64_patch (labels [2], code);
        amd64_mov_reg_membase (code, MONO_ARCH_IMT_SCRATCH_REG, MONO_ARCH_IMT_SCRATCH_REG, sizeof (target_mgreg_t), sizeof (target_mgreg_t));
        amd64_jump_membase (code, MONO_ARCH_IMT_SCRATCH_REG, 0);

        /* No match */
        mono_amd64_patch (labels [1], code);
        /* Load fail tramp */
        amd64_alu_reg_imm (code, X86_ADD, MONO_ARCH_IMT_SCRATCH_REG, sizeof (target_mgreg_t));
        /* Check if there is a fail tramp */
        amd64_alu_membase_imm (code, X86_CMP, MONO_ARCH_IMT_SCRATCH_REG, 0, 0);
        labels [3] = code;
        amd64_branch8 (code, X86_CC_Z, 0, FALSE);
        /* Jump to fail tramp */
        amd64_jump_membase (code, MONO_ARCH_IMT_SCRATCH_REG, 0);

        /* Fail */
        mono_amd64_patch (labels [3], code);
        x86_breakpoint (code);

        if (!acfg->llvm) {
                /* mov <OFFSET>(%rip), MONO_ARCH_IMT_SCRATCH_REG */
                amd64_emit_rex (mov_buf_ptr, sizeof(gpointer), MONO_ARCH_IMT_SCRATCH_REG, 0, AMD64_RIP);
                *(mov_buf_ptr)++ = (unsigned char)0x8b; /* mov opcode */
                x86_address_byte (mov_buf_ptr, 0, MONO_ARCH_IMT_SCRATCH_REG & 0x7, 5);
                emit_bytes (acfg, mov_buf, mov_buf_ptr - mov_buf);
                emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) - 4);
        }
        emit_bytes (acfg, buf, code - buf);

        *tramp_size = code - buf + kSizeOfMove;

        g_free (buf);

#elif defined(TARGET_X86)
        guint8 *buf, *code;
        guint8 *labels [16];

        code = buf = g_malloc (256);

        /* Allocate a temporary stack slot */
        x86_push_reg (code, X86_EAX);
        /* Save EAX */
        x86_push_reg (code, X86_EAX);

        /* Load mscorlib got address */
        x86_mov_reg_membase (code, X86_EAX, MONO_ARCH_GOT_REG, sizeof (target_mgreg_t), 4);
        /* Load arg */
        x86_mov_reg_membase (code, X86_EAX, X86_EAX, offset * sizeof (target_mgreg_t), 4);

        labels [0] = code;
        x86_alu_membase_imm (code, X86_CMP, X86_EAX, 0, 0);
        labels [1] = code;
        x86_branch8 (code, X86_CC_Z, FALSE, 0);

        /* Check key */
        x86_alu_membase_reg (code, X86_CMP, X86_EAX, 0, MONO_ARCH_IMT_REG);
        labels [2] = code;
        x86_branch8 (code, X86_CC_Z, FALSE, 0);

        /* Loop footer */
        x86_alu_reg_imm (code, X86_ADD, X86_EAX, 2 * sizeof (target_mgreg_t));
        x86_jump_code (code, labels [0]);

        /* Match */
        mono_x86_patch (labels [2], code);
        x86_mov_reg_membase (code, X86_EAX, X86_EAX, sizeof (target_mgreg_t), 4);
        x86_mov_reg_membase (code, X86_EAX, X86_EAX, 0, 4);
        /* Save the target address to the temporary stack location */
        x86_mov_membase_reg (code, X86_ESP, 4, X86_EAX, 4);
        /* Restore EAX */
        x86_pop_reg (code, X86_EAX);
        /* Jump to the target address */
        x86_ret (code);

        /* No match */
        mono_x86_patch (labels [1], code);
        /* Load fail tramp */
        x86_mov_reg_membase (code, X86_EAX, X86_EAX, sizeof (target_mgreg_t), 4);
        x86_alu_membase_imm (code, X86_CMP, X86_EAX, 0, 0);
        labels [3] = code;
        x86_branch8 (code, X86_CC_Z, FALSE, 0);
        /* Jump to fail tramp */
        x86_mov_membase_reg (code, X86_ESP, 4, X86_EAX, 4);
        x86_pop_reg (code, X86_EAX);
        x86_ret (code);

        /* Fail */
        mono_x86_patch (labels [3], code);
        x86_breakpoint (code);

        emit_bytes (acfg, buf, code - buf);
        
        *tramp_size = code - buf;

        g_free (buf);

#elif defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code, *code2, *labels [16];

        code = buf;

        /* The IMT method is in v5 */

        /* Need at least two free registers, plus a slot for storing the pc */
        ARM_PUSH (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_R2));
        labels [0] = code;
        /* Load the parameter from the GOT */
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_PC, 0);
        ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R0);

        labels [1] = code;
        ARM_LDR_IMM (code, ARMREG_R1, ARMREG_R0, 0);
        ARM_CMP_REG_REG (code, ARMREG_R1, ARMREG_V5);
        labels [2] = code;
        ARM_B_COND (code, ARMCOND_EQ, 0);

        /* End-of-loop check */
        ARM_CMP_REG_IMM (code, ARMREG_R1, 0, 0);
        labels [3] = code;
        ARM_B_COND (code, ARMCOND_EQ, 0);

        /* Loop footer */
        ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, sizeof (target_mgreg_t) * 2);
        labels [4] = code;
        ARM_B (code, 0);
        arm_patch (labels [4], labels [1]);

        /* Match */
        arm_patch (labels [2], code);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 4);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 0);
        /* Save it to the third stack slot */
        ARM_STR_IMM (code, ARMREG_R0, ARMREG_SP, 8);
        /* Restore the registers and branch */
        ARM_POP (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_PC));

        /* No match */
        arm_patch (labels [3], code);
        ARM_LDR_IMM (code, ARMREG_R0, ARMREG_R0, 4);
        ARM_STR_IMM (code, ARMREG_R0, ARMREG_SP, 8);
        ARM_POP (code, (1 << ARMREG_R0)|(1 << ARMREG_R1)|(1 << ARMREG_PC));

        /* Fixup offset */
        code2 = labels [0];
        ARM_LDR_IMM (code2, ARMREG_R0, ARMREG_PC, (code - (labels [0] + 8)));

        emit_bytes (acfg, buf, code - buf);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) + (code - (labels [0] + 8)) - 4);

        *tramp_size = code - buf + 4;
#elif defined(TARGET_ARM64)
        arm64_emit_imt_trampoline (acfg, offset, tramp_size);
#elif defined(TARGET_POWERPC)
        guint8 buf [128];
        guint8 *code, *labels [16];

        code = buf;

        /* Load the mscorlib got address */
        ppc_ldptr (code, ppc_r12, sizeof (target_mgreg_t), ppc_r30);
        /* Load the parameter from the GOT */
        ppc_load (code, ppc_r0, offset * sizeof (target_mgreg_t));
        ppc_ldptr_indexed (code, ppc_r12, ppc_r12, ppc_r0);

        /* Load and check key */
        labels [1] = code;
        ppc_ldptr (code, ppc_r0, 0, ppc_r12);
        ppc_cmp (code, 0, sizeof (target_mgreg_t) == 8 ? 1 : 0, ppc_r0, MONO_ARCH_IMT_REG);
        labels [2] = code;
        ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);

        /* End-of-loop check */
        ppc_cmpi (code, 0, sizeof (target_mgreg_t) == 8 ? 1 : 0, ppc_r0, 0);
        labels [3] = code;
        ppc_bc (code, PPC_BR_TRUE, PPC_BR_EQ, 0);

        /* Loop footer */
        ppc_addi (code, ppc_r12, ppc_r12, 2 * sizeof (target_mgreg_t));
        labels [4] = code;
        ppc_b (code, 0);
        mono_ppc_patch (labels [4], labels [1]);

        /* Match */
        mono_ppc_patch (labels [2], code);
        ppc_ldptr (code, ppc_r12, sizeof (target_mgreg_t), ppc_r12);
        /* r12 now contains the value of the vtable slot */
        /* this is not a function descriptor on ppc64 */
        ppc_ldptr (code, ppc_r12, 0, ppc_r12);
        ppc_mtctr (code, ppc_r12);
        ppc_bcctr (code, PPC_BR_ALWAYS, 0);

        /* Fail */
        mono_ppc_patch (labels [3], code);
        /* FIXME: */
        ppc_break (code);

        *tramp_size = code - buf;

        emit_bytes (acfg, buf, code - buf);
#else
        g_assert_not_reached ();
#endif
}


#if defined (TARGET_AMD64)

static void
amd64_emit_load_got_slot (MonoAotCompile *acfg, int dreg, int got_slot)
{

        g_assert (acfg->fp);
        emit_unset_mode (acfg);

        fprintf (acfg->fp, "mov %s+%d(%%rip), %s\n", acfg->got_symbol, (unsigned int) ((got_slot * sizeof (target_mgreg_t))), mono_arch_regname (dreg));
}

#endif


/*
 * arch_emit_gsharedvt_arg_trampoline:
 *
 *   Emit code for a gsharedvt arg trampoline. OFFSET is the offset of the first of
 * two GOT slots which contain the argument, and the code to jump to.
 * TRAMP_SIZE is set to the size of the emitted trampoline.
 * These kinds of trampolines cannot be enumerated statically, since there could
 * be one trampoline per method instantiation, so we emit the same code for all
 * trampolines, and parameterize them using two GOT slots.
 */
static void
arch_emit_gsharedvt_arg_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
#if defined(TARGET_X86)
        guint8 buf [128];
        guint8 *code;

        /* Similar to the PPC code above */

        g_assert (MONO_ARCH_RGCTX_REG != X86_ECX);

        code = buf;
        /* Load mscorlib got address */
        x86_mov_reg_membase (code, X86_ECX, MONO_ARCH_GOT_REG, sizeof (target_mgreg_t), 4);
        /* Load arg */
        x86_mov_reg_membase (code, X86_EAX, X86_ECX, offset * sizeof (target_mgreg_t), 4);
        /* Branch to the target address */
        x86_jump_membase (code, X86_ECX, (offset + 1) * sizeof (target_mgreg_t));

        emit_bytes (acfg, buf, code - buf);

        *tramp_size = 15;
        g_assert (code - buf == *tramp_size);
#elif defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;

        /* The same as mono_arch_get_gsharedvt_arg_trampoline (), but for AOT */
        /* Similar to arch_emit_specific_trampoline () */
        *tramp_size = 24;
        code = buf;
        ARM_PUSH (code, (1 << ARMREG_R0) | (1 << ARMREG_R1) | (1 << ARMREG_R2) | (1 << ARMREG_R3));
        ARM_LDR_IMM (code, ARMREG_R1, ARMREG_PC, 8);
        /* Load the arg value from the GOT */
        ARM_LDR_REG_REG (code, ARMREG_R0, ARMREG_PC, ARMREG_R1);
        /* Load the addr from the GOT */
        ARM_LDR_REG_REG (code, ARMREG_R1, ARMREG_PC, ARMREG_R1);
        /* Branch to it */
        ARM_BX (code, ARMREG_R1);

        g_assert (code - buf == 20);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) + 4);
#elif defined(TARGET_ARM64)
        arm64_emit_gsharedvt_arg_trampoline (acfg, offset, tramp_size);
#elif defined (TARGET_AMD64)

        amd64_emit_load_got_slot (acfg, AMD64_RAX, offset);
        amd64_emit_load_got_slot (acfg, MONO_ARCH_IMT_SCRATCH_REG, offset + 1);
        g_assert (AMD64_R11 == MONO_ARCH_IMT_SCRATCH_REG);
        fprintf (acfg->fp, "jmp *%%r11\n");

        *tramp_size = 0x11;
#else
        g_assert_not_reached ();
#endif
}       

static void
arch_emit_ftnptr_arg_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
#if defined(TARGET_ARM)
        guint8 buf [128];
        guint8 *code;

        *tramp_size = 32;
        code = buf;

        /* Load target address and push it on stack */
        ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 16);
        ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
        ARM_PUSH (code, 1 << ARMREG_IP);
        /* Load argument in ARMREG_IP */
        ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 8);
        ARM_LDR_REG_REG (code, ARMREG_IP, ARMREG_PC, ARMREG_IP);
        /* Branch */
        ARM_POP (code, 1 << ARMREG_PC);

        g_assert (code - buf == 24);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", ((offset + 1) * sizeof (target_mgreg_t)) + 12); // offset from ldr pc to addr
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) + 4); // offset from ldr pc to arg
#else
        g_assert_not_reached ();
#endif
}

static void
arch_emit_unbox_arbitrary_trampoline (MonoAotCompile *acfg, int offset, int *tramp_size)
{
#if defined(TARGET_ARM64)
        emit_unset_mode (acfg);
        fprintf (acfg->fp, "add x0, x0, %d\n", (int)(MONO_ABI_SIZEOF (MonoObject)));
        arm64_emit_load_got_slot (acfg, ARMREG_R17, offset);
        fprintf (acfg->fp, "br x17\n");
        *tramp_size = 5 * 4;
#elif defined (TARGET_AMD64)
        guint8 buf [32];
        guint8 *code;
        int this_reg;

        this_reg = mono_arch_get_this_arg_reg (NULL);
        code = buf;
        amd64_alu_reg_imm (code, X86_ADD, this_reg, MONO_ABI_SIZEOF (MonoObject));
        emit_bytes (acfg, buf, code - buf);

        amd64_emit_load_got_slot (acfg, AMD64_RAX, offset);
        fprintf (acfg->fp, "jmp *%%rax\n");

        *tramp_size = 13;
#elif defined (TARGET_ARM)
        guint8 buf [32];
        guint8 *code, *label;

        code = buf;
        /* Unbox */
        ARM_ADD_REG_IMM8 (code, ARMREG_R0, ARMREG_R0, MONO_ABI_SIZEOF (MonoObject));

        label = code;
        /* Calculate GOT slot */
        ARM_LDR_IMM (code, ARMREG_IP, ARMREG_PC, 0);
        /* Load target addr into PC*/
        ARM_LDR_REG_REG (code, ARMREG_PC, ARMREG_PC, ARMREG_IP);

        g_assert (code - buf == 12);

        /* Emit it */
        emit_bytes (acfg, buf, code - buf);
        emit_symbol_diff (acfg, acfg->got_symbol, ".", (offset * sizeof (target_mgreg_t)) + (code - (label + 8)) - 4);
        *tramp_size = 4 * 4;
#else
        g_error ("NOT IMPLEMENTED: needed for AOT<>interp mixed mode transition");
#endif
}

/* END OF ARCH SPECIFIC CODE */

static guint32
mono_get_field_token (MonoClassField *field) 
{
        MonoClass *klass = field->parent;
        int i;

        int fcount = mono_class_get_field_count (klass);
        MonoClassField *klass_fields = m_class_get_fields (klass);
        for (i = 0; i < fcount; ++i) {
                if (field == &klass_fields [i])
                        return MONO_TOKEN_FIELD_DEF | (mono_class_get_first_field_idx (klass) + 1 + i);
        }

        g_assert_not_reached ();
        return 0;
}

static inline void
encode_value (gint32 value, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;

        //printf ("ENCODE: %d 0x%x.\n", value, value);

        /* 
         * Same encoding as the one used in the metadata, extended to handle values
         * greater than 0x1fffffff.
         */
        if ((value >= 0) && (value <= 127))
                *p++ = value;
        else if ((value >= 0) && (value <= 16383)) {
                p [0] = 0x80 | (value >> 8);
                p [1] = value & 0xff;
                p += 2;
        } else if ((value >= 0) && (value <= 0x1fffffff)) {
                p [0] = (value >> 24) | 0xc0;
                p [1] = (value >> 16) & 0xff;
                p [2] = (value >> 8) & 0xff;
                p [3] = value & 0xff;
                p += 4;
        }
        else {
                p [0] = 0xff;
                p [1] = (value >> 24) & 0xff;
                p [2] = (value >> 16) & 0xff;
                p [3] = (value >> 8) & 0xff;
                p [4] = value & 0xff;
                p += 5;
        }
        if (endbuf)
                *endbuf = p;
}

static void
stream_init (MonoDynamicStream *sh)
{
        sh->index = 0;
        sh->alloc_size = 4096;
        sh->data = (char *)g_malloc (4096);

        /* So offsets are > 0 */
        sh->data [0] = 0;
        sh->index ++;
}

static void
make_room_in_stream (MonoDynamicStream *stream, int size)
{
        if (size <= stream->alloc_size)
                return;
        
        while (stream->alloc_size <= size) {
                if (stream->alloc_size < 4096)
                        stream->alloc_size = 4096;
                else
                        stream->alloc_size *= 2;
        }
        
        stream->data = (char *)g_realloc (stream->data, stream->alloc_size);
}

static guint32
add_stream_data (MonoDynamicStream *stream, const char *data, guint32 len)
{
        guint32 idx;
        
        make_room_in_stream (stream, stream->index + len);
        memcpy (stream->data + stream->index, data, len);
        idx = stream->index;
        stream->index += len;
        return idx;
}

/*
 * add_to_blob:
 *
 *   Add data to the binary blob inside the aot image. Returns the offset inside the
 * blob where the data was stored.
 */
static guint32
add_to_blob (MonoAotCompile *acfg, const guint8 *data, guint32 data_len)
{
        g_assert (!acfg->blob_closed);

        if (acfg->blob.alloc_size == 0)
                stream_init (&acfg->blob);

        acfg->stats.blob_size += data_len;

        return add_stream_data (&acfg->blob, (char*)data, data_len);
}

static guint32
add_to_blob_aligned (MonoAotCompile *acfg, const guint8 *data, guint32 data_len, guint32 align)
{
        char buf [4] = {0};
        guint32 count;

        if (acfg->blob.alloc_size == 0)
                stream_init (&acfg->blob);

        count = acfg->blob.index % align;

        /* we assume the stream data will be aligned */
        if (count)
                add_stream_data (&acfg->blob, buf, 4 - count);

        return add_stream_data (&acfg->blob, (char*)data, data_len);
}

/* Emit a table of data into the aot image */
static void
emit_aot_data (MonoAotCompile *acfg, MonoAotFileTable table, const char *symbol, guint8 *data, int size)
{
        if (acfg->data_outfile) {
                acfg->table_offsets [(int)table] = acfg->datafile_offset;
                fwrite (data,1, size, acfg->data_outfile);
                acfg->datafile_offset += size;
                // align the data to 8 bytes. Put zeros in the file (so that every build results in consistent output).
                int align = 8 - size % 8;
                acfg->datafile_offset += align;
                guint8 align_buf [16];
                memset (&align_buf, 0, sizeof (align_buf));
                fwrite (align_buf, align, 1, acfg->data_outfile);
        } else if (acfg->llvm) {
                mono_llvm_emit_aot_data (symbol, data, size);
        } else {
                emit_section_change (acfg, RODATA_SECT, 0);
                emit_alignment (acfg, 8);
                emit_label (acfg, symbol);
                emit_bytes (acfg, data, size);
        }
}

/*
 * emit_offset_table:
 *
 *   Emit a table of increasing offsets in a compact form using differential encoding.
 * There is an index entry for each GROUP_SIZE number of entries. The greater the
 * group size, the more compact the table becomes, but the slower it becomes to compute
 * a given entry. Returns the size of the table.
 */
static guint32
emit_offset_table (MonoAotCompile *acfg, const char *symbol, MonoAotFileTable table, int noffsets, int group_size, gint32 *offsets)
{
        gint32 current_offset;
        int i, buf_size, ngroups, index_entry_size;
        guint8 *p, *buf;
        guint8 *data_p, *data_buf;
        guint32 *index_offsets;

        ngroups = (noffsets + (group_size - 1)) / group_size;

        index_offsets = g_new0 (guint32, ngroups);

        buf_size = noffsets * 4;
        p = buf = (guint8 *)g_malloc0 (buf_size);

        current_offset = 0;
        for (i = 0; i < noffsets; ++i) {
                //printf ("D: %d -> %d\n", i, offsets [i]);
                if ((i % group_size) == 0) {
                        index_offsets [i / group_size] = p - buf;
                        /* Emit the full value for these entries */
                        encode_value (offsets [i], p, &p);
                } else {
                        /* The offsets are allowed to be non-increasing */
                        //g_assert (offsets [i] >= current_offset);
                        encode_value (offsets [i] - current_offset, p, &p);
                }
                current_offset = offsets [i];
        }
        data_buf = buf;
        data_p = p;

        if (ngroups && index_offsets [ngroups - 1] < 65000)
                index_entry_size = 2;
        else
                index_entry_size = 4;

        buf_size = (data_p - data_buf) + (ngroups * 4) + 16;
        p = buf = (guint8 *)g_malloc0 (buf_size);

        /* Emit the header */
        encode_int (noffsets, p, &p);
        encode_int (group_size, p, &p);
        encode_int (ngroups, p, &p);
        encode_int (index_entry_size, p, &p);

        /* Emit the index */
        for (i = 0; i < ngroups; ++i) {
                if (index_entry_size == 2)
                        encode_int16 (index_offsets [i], p, &p);
                else
                        encode_int (index_offsets [i], p, &p);
        }
        /* Emit the data */
        memcpy (p, data_buf, data_p - data_buf);
        p += data_p - data_buf;

        g_assert (p - buf <= buf_size);

        emit_aot_data (acfg, table, symbol, buf, p - buf);

        g_free (buf);
        g_free (data_buf);

    return (int)(p - buf);
}

static guint32
get_image_index (MonoAotCompile *cfg, MonoImage *image)
{
        guint32 index;

        index = GPOINTER_TO_UINT (g_hash_table_lookup (cfg->image_hash, image));
        if (index)
                return index - 1;
        else {
                index = g_hash_table_size (cfg->image_hash);
                g_hash_table_insert (cfg->image_hash, image, GUINT_TO_POINTER (index + 1));
                g_ptr_array_add (cfg->image_table, image);
                return index;
        }
}

static guint32
find_typespec_for_class (MonoAotCompile *acfg, MonoClass *klass)
{
        int i;
        int len = acfg->image->tables [MONO_TABLE_TYPESPEC].rows;

        /* FIXME: Search referenced images as well */
        if (!acfg->typespec_classes) {
                acfg->typespec_classes = g_hash_table_new (NULL, NULL);
                for (i = 0; i < len; i++) {
                        ERROR_DECL (error);
                        int typespec = MONO_TOKEN_TYPE_SPEC | (i + 1);
                        MonoClass *klass_key = mono_class_get_and_inflate_typespec_checked (acfg->image, typespec, NULL, error);
                        if (!is_ok (error)) {
                                mono_error_cleanup (error);
                                continue;
                        }
                        g_hash_table_insert (acfg->typespec_classes, klass_key, GINT_TO_POINTER (typespec));
                }
        }
        return GPOINTER_TO_INT (g_hash_table_lookup (acfg->typespec_classes, klass));
}

static void
encode_method_ref (MonoAotCompile *acfg, MonoMethod *method, guint8 *buf, guint8 **endbuf);

static void
encode_klass_ref (MonoAotCompile *acfg, MonoClass *klass, guint8 *buf, guint8 **endbuf);

static void
encode_ginst (MonoAotCompile *acfg, MonoGenericInst *inst, guint8 *buf, guint8 **endbuf);

static void
encode_type (MonoAotCompile *acfg, MonoType *t, guint8 *buf, guint8 **endbuf);

static guint32
get_shared_ginst_ref (MonoAotCompile *acfg, MonoGenericInst *ginst);

static void
encode_klass_ref_inner (MonoAotCompile *acfg, MonoClass *klass, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;

        /*
         * The encoding begins with one of the MONO_AOT_TYPEREF values, followed by additional
         * information.
         */

        if (mono_class_is_ginst (klass)) {
                guint32 token;
                g_assert (m_class_get_type_token (klass));

                /* Find a typespec for a class if possible */
                token = find_typespec_for_class (acfg, klass);
                if (token) {
                        encode_value (MONO_AOT_TYPEREF_TYPESPEC_TOKEN, p, &p);
                        encode_value (token, p, &p);
                } else {
                        MonoClass *gclass = mono_class_get_generic_class (klass)->container_class;
                        MonoGenericInst *inst = mono_class_get_generic_class (klass)->context.class_inst;
                        static int count = 0;
                        guint8 *p1 = p;

                        encode_value (MONO_AOT_TYPEREF_GINST, p, &p);
                        encode_klass_ref (acfg, gclass, p, &p);
                        guint32 offset = get_shared_ginst_ref (acfg, inst);
                        encode_value (offset, p, &p);

                        count += p - p1;
                }
        } else if (m_class_get_type_token (klass)) {
                int iindex = get_image_index (acfg, m_class_get_image (klass));

                g_assert (mono_metadata_token_code (m_class_get_type_token (klass)) == MONO_TOKEN_TYPE_DEF);
                if (iindex == 0) {
                        encode_value (MONO_AOT_TYPEREF_TYPEDEF_INDEX, p, &p);
                        encode_value (m_class_get_type_token (klass) - MONO_TOKEN_TYPE_DEF, p, &p);
                } else {
                        encode_value (MONO_AOT_TYPEREF_TYPEDEF_INDEX_IMAGE, p, &p);
                        encode_value (m_class_get_type_token (klass) - MONO_TOKEN_TYPE_DEF, p, &p);
                        encode_value (get_image_index (acfg, m_class_get_image (klass)), p, &p);
                }
        } else if ((m_class_get_byval_arg (klass)->type == MONO_TYPE_VAR) || (m_class_get_byval_arg (klass)->type == MONO_TYPE_MVAR)) {
                MonoGenericContainer *container = mono_type_get_generic_param_owner (m_class_get_byval_arg (klass));
                MonoGenericParam *par = m_class_get_byval_arg (klass)->data.generic_param;

                encode_value (MONO_AOT_TYPEREF_VAR, p, &p);

                encode_value (par->gshared_constraint ? 1 : 0, p, &p);
                if (par->gshared_constraint) {
                        MonoGSharedGenericParam *gpar = (MonoGSharedGenericParam*)par;
                        encode_type (acfg, par->gshared_constraint, p, &p);
                        encode_klass_ref (acfg, mono_class_create_generic_parameter (gpar->parent), p, &p);
                } else {
                        encode_value (m_class_get_byval_arg (klass)->type, p, &p);
                        encode_value (mono_type_get_generic_param_num (m_class_get_byval_arg (klass)), p, &p);

                        encode_value (container->is_anonymous ? 0 : 1, p, &p);

                        if (!container->is_anonymous) {
                                encode_value (container->is_method, p, &p);
                                if (container->is_method)
                                        encode_method_ref (acfg, container->owner.method, p, &p);
                                else
                                        encode_klass_ref (acfg, container->owner.klass, p, &p);
                        }
                }
        } else if (m_class_get_byval_arg (klass)->type == MONO_TYPE_PTR) {
                encode_value (MONO_AOT_TYPEREF_PTR, p, &p);
                encode_type (acfg, m_class_get_byval_arg (klass), p, &p);
        } else {
                /* Array class */
                g_assert (m_class_get_rank (klass) > 0);
                encode_value (MONO_AOT_TYPEREF_ARRAY, p, &p);
                encode_value (m_class_get_rank (klass), p, &p);
                encode_klass_ref (acfg, m_class_get_element_class (klass), p, &p);
        }

        acfg->stats.class_ref_count++;
        acfg->stats.class_ref_size += p - buf;

        *endbuf = p;
}

static guint32
get_shared_klass_ref (MonoAotCompile *acfg, MonoClass *klass)
{
        guint offset = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->klass_blob_hash, klass));
        guint8 *buf2, *p;

        if (!offset) {
                buf2 = (guint8 *)g_malloc (1024);
                p = buf2;

                encode_klass_ref_inner (acfg, klass, p, &p);
                g_assert (p - buf2 < 1024);

                offset = add_to_blob (acfg, buf2, p - buf2);
                g_free (buf2);

                g_hash_table_insert (acfg->klass_blob_hash, klass, GUINT_TO_POINTER (offset + 1));
        } else {
                offset --;
        }

        return offset;
}

/*
 * encode_klass_ref:
 *
 *   Encode a reference to KLASS. We use our home-grown encoding instead of the
 * standard metadata encoding.
 */
static void
encode_klass_ref (MonoAotCompile *acfg, MonoClass *klass, guint8 *buf, guint8 **endbuf)
{
        gboolean shared = FALSE;

        /* 
         * The encoding of generic instances is large so emit them only once.
         */
        if (mono_class_is_ginst (klass)) {
                guint32 token;
                g_assert (m_class_get_type_token (klass));

                /* Find a typespec for a class if possible */
                token = find_typespec_for_class (acfg, klass);
                if (!token)
                        shared = TRUE;
        } else if ((m_class_get_byval_arg (klass)->type == MONO_TYPE_VAR) || (m_class_get_byval_arg (klass)->type == MONO_TYPE_MVAR)) {
                shared = TRUE;
        }

        if (shared) {
                guint8 *p;
                guint32 offset = get_shared_klass_ref (acfg, klass);

                p = buf;
                encode_value (MONO_AOT_TYPEREF_BLOB_INDEX, p, &p);
                encode_value (offset, p, &p);
                *endbuf = p;
                return;
        }

        encode_klass_ref_inner (acfg, klass, buf, endbuf);
}

static void
encode_field_info (MonoAotCompile *cfg, MonoClassField *field, guint8 *buf, guint8 **endbuf)
{
        guint32 token = mono_get_field_token (field);
        guint8 *p = buf;

        encode_klass_ref (cfg, field->parent, p, &p);
        g_assert (mono_metadata_token_code (token) == MONO_TOKEN_FIELD_DEF);
        encode_value (token - MONO_TOKEN_FIELD_DEF, p, &p);
        *endbuf = p;
}

static void
encode_ginst (MonoAotCompile *acfg, MonoGenericInst *inst, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;
        int i;

        encode_value (inst->type_argc, p, &p);
        for (i = 0; i < inst->type_argc; ++i)
                encode_klass_ref (acfg, mono_class_from_mono_type_internal (inst->type_argv [i]), p, &p);

        acfg->stats.ginst_count++;
        acfg->stats.ginst_size += p - buf;

        *endbuf = p;
}

static guint32
get_shared_ginst_ref (MonoAotCompile *acfg, MonoGenericInst *ginst)
{
        guint32 offset = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->ginst_blob_hash, ginst));
        if (!offset) {
                guint8 *buf2, *p2;

                buf2 = (guint8 *)g_malloc (1024);
                p2 = buf2;

                encode_ginst (acfg, ginst, p2, &p2);
                g_assert (p2 - buf2 < 1024);

                offset = add_to_blob (acfg, buf2, p2 - buf2);
                g_free (buf2);

                g_hash_table_insert (acfg->ginst_blob_hash, ginst, GUINT_TO_POINTER (offset + 1));
        } else {
                offset --;
        }
        return offset;
}

static void
encode_generic_context (MonoAotCompile *acfg, MonoGenericContext *context, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;
        MonoGenericInst *inst;
        guint32 flags = (context->class_inst ? 1 : 0) | (context->method_inst ? 2 : 0);

        g_assert (flags);

        encode_value (flags, p, &p);
        inst = context->class_inst;
        if (inst) {
                guint32 offset = get_shared_ginst_ref (acfg, inst);
                encode_value (offset, p, &p);
        }
        inst = context->method_inst;
        if (inst) {
                guint32 offset = get_shared_ginst_ref (acfg, inst);
                encode_value (offset, p, &p);
        }
        *endbuf = p;
}

static void
encode_type (MonoAotCompile *acfg, MonoType *t, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;

        if (t->has_cmods) {
                int count = mono_type_custom_modifier_count (t);

                *p = MONO_TYPE_CMOD_REQD;
                ++p;

                encode_value (count, p, &p);
                for (int i = 0; i < count; ++i) {
                        ERROR_DECL (error);
                        gboolean required;
                        MonoType *cmod_type = mono_type_get_custom_modifier (t, i, &required, error);
                        mono_error_assert_ok (error);
                        encode_value (required, p, &p);
                        encode_type (acfg, cmod_type, p, &p);
                }
        }

        /* t->attrs can be ignored */
        //g_assert (t->attrs == 0);

        if (t->pinned) {
                *p = MONO_TYPE_PINNED;
                ++p;
        }
        if (t->byref) {
                *p = MONO_TYPE_BYREF;
                ++p;
        }

        *p = t->type;
        p ++;

        switch (t->type) {
        case MONO_TYPE_VOID:
        case MONO_TYPE_BOOLEAN:
        case MONO_TYPE_CHAR:
        case MONO_TYPE_I1:
        case MONO_TYPE_U1:
        case MONO_TYPE_I2:
        case MONO_TYPE_U2:
        case MONO_TYPE_I4:
        case MONO_TYPE_U4:
        case MONO_TYPE_I8:
        case MONO_TYPE_U8:
        case MONO_TYPE_R4:
        case MONO_TYPE_R8:
        case MONO_TYPE_I:
        case MONO_TYPE_U:
        case MONO_TYPE_STRING:
        case MONO_TYPE_OBJECT:
        case MONO_TYPE_TYPEDBYREF:
                break;
        case MONO_TYPE_VALUETYPE:
        case MONO_TYPE_CLASS:
                encode_klass_ref (acfg, mono_class_from_mono_type_internal (t), p, &p);
                break;
        case MONO_TYPE_SZARRAY:
                encode_klass_ref (acfg, t->data.klass, p, &p);
                break;
        case MONO_TYPE_PTR:
                encode_type (acfg, t->data.type, p, &p);
                break;
        case MONO_TYPE_GENERICINST: {
                MonoClass *gclass = t->data.generic_class->container_class;
                MonoGenericInst *inst = t->data.generic_class->context.class_inst;

                encode_klass_ref (acfg, gclass, p, &p);
                encode_ginst (acfg, inst, p, &p);
                break;
        }
        case MONO_TYPE_ARRAY: {
                MonoArrayType *array = t->data.array;
                int i;

                encode_klass_ref (acfg, array->eklass, p, &p);
                encode_value (array->rank, p, &p);
                encode_value (array->numsizes, p, &p);
                for (i = 0; i < array->numsizes; ++i)
                        encode_value (array->sizes [i], p, &p);
                encode_value (array->numlobounds, p, &p);
                for (i = 0; i < array->numlobounds; ++i)
                        encode_value (array->lobounds [i], p, &p);
                break;
        }
        case MONO_TYPE_VAR:
        case MONO_TYPE_MVAR:
                encode_klass_ref (acfg, mono_class_from_mono_type_internal (t), p, &p);
                break;
        default:
                g_assert_not_reached ();
        }

        *endbuf = p;
}

static void
encode_signature (MonoAotCompile *acfg, MonoMethodSignature *sig, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;
        guint32 flags = 0;
        int i;

        /* Similar to the metadata encoding */
        if (sig->generic_param_count)
                flags |= 0x10;
        if (sig->hasthis)
                flags |= 0x20;
        if (sig->explicit_this)
                flags |= 0x40;
        flags |= (sig->call_convention & 0x0F);

        *p = flags;
        ++p;
        if (sig->generic_param_count)
                encode_value (sig->generic_param_count, p, &p);
        encode_value (sig->param_count, p, &p);

        encode_type (acfg, sig->ret, p, &p);
        for (i = 0; i < sig->param_count; ++i) {
                if (sig->sentinelpos == i) {
                        *p = MONO_TYPE_SENTINEL;
                        ++p;
                }
                encode_type (acfg, sig->params [i], p, &p);
        }

        *endbuf = p;
}

#define MAX_IMAGE_INDEX 250

static void
encode_method_ref (MonoAotCompile *acfg, MonoMethod *method, guint8 *buf, guint8 **endbuf)
{
        guint32 image_index = get_image_index (acfg, m_class_get_image (method->klass));
        guint32 token = method->token;
        MonoJumpInfoToken *ji;
        guint8 *p = buf;

        /*
         * The encoding for most methods is as follows:
         * - image index encoded as a leb128
         * - token index encoded as a leb128
         * Values of image index >= MONO_AOT_METHODREF_MIN are used to mark additional
         * types of method encodings.
         */

        /* Mark methods which can't use aot trampolines because they need the further 
         * processing in mono_magic_trampoline () which requires a MonoMethod*.
         */
        if ((method->is_generic && (method->flags & METHOD_ATTRIBUTE_VIRTUAL)) ||
                (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED))
                encode_value ((MONO_AOT_METHODREF_NO_AOT_TRAMPOLINE << 24), p, &p);

        if (method->wrapper_type) {
                WrapperInfo *info = mono_marshal_get_wrapper_info (method);

                encode_value ((MONO_AOT_METHODREF_WRAPPER << 24), p, &p);

                encode_value (method->wrapper_type, p, &p);

                switch (method->wrapper_type) {
                case MONO_WRAPPER_REMOTING_INVOKE:
                case MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK:
                case MONO_WRAPPER_XDOMAIN_INVOKE: {
                        MonoMethod *m;

                        m = mono_marshal_method_from_wrapper (method);
                        g_assert (m);
                        encode_method_ref (acfg, m, p, &p);
                        break;
                }
                case MONO_WRAPPER_PROXY_ISINST:
                case MONO_WRAPPER_LDFLD:
                case MONO_WRAPPER_LDFLDA:
                case MONO_WRAPPER_STFLD: {
                        g_assert (info);
                        encode_klass_ref (acfg, info->d.proxy.klass, p, &p);
                        break;
                }
                case MONO_WRAPPER_ALLOC: {
                        /* The GC name is saved once in MonoAotFileInfo */
                        g_assert (info->d.alloc.alloc_type != -1);
                        encode_value (info->d.alloc.alloc_type, p, &p);
                        break;
                }
                case MONO_WRAPPER_WRITE_BARRIER: {
                        g_assert (info);
                        break;
                }
                case MONO_WRAPPER_STELEMREF: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);
                        if (info->subtype == WRAPPER_SUBTYPE_VIRTUAL_STELEMREF)
                                encode_value (info->d.virtual_stelemref.kind, p, &p);
                        break;
                }
                case MONO_WRAPPER_OTHER: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);
                        if (info->subtype == WRAPPER_SUBTYPE_PTR_TO_STRUCTURE ||
                                info->subtype == WRAPPER_SUBTYPE_STRUCTURE_TO_PTR)
                                encode_klass_ref (acfg, method->klass, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_SYNCHRONIZED_INNER)
                                encode_method_ref (acfg, info->d.synchronized_inner.method, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_ARRAY_ACCESSOR)
                                encode_method_ref (acfg, info->d.array_accessor.method, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_INTERP_IN)
                                encode_signature (acfg, info->d.interp_in.sig, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_IN_SIG)
                                encode_signature (acfg, info->d.gsharedvt.sig, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_OUT_SIG)
                                encode_signature (acfg, info->d.gsharedvt.sig, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_INTERP_LMF)
                                encode_value (info->d.icall.jit_icall_id, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_AOT_INIT)
                                encode_value (info->d.aot_init.subtype, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_LLVM_FUNC)
                                encode_value (info->d.llvm_func.subtype, p, &p);
                        break;
                }
                case MONO_WRAPPER_MANAGED_TO_NATIVE: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);
                        if (info->subtype == WRAPPER_SUBTYPE_ICALL_WRAPPER) {
                                encode_value (info->d.icall.jit_icall_id, p, &p);
                        } else if (info->subtype == WRAPPER_SUBTYPE_NATIVE_FUNC_AOT) {
                                encode_method_ref (acfg, info->d.managed_to_native.method, p, &p);
                        } else {
                                g_assert (info->subtype == WRAPPER_SUBTYPE_NONE || info->subtype == WRAPPER_SUBTYPE_PINVOKE);
                                encode_method_ref (acfg, info->d.managed_to_native.method, p, &p);
                        }
                        break;
                }
                case MONO_WRAPPER_SYNCHRONIZED: {
                        MonoMethod *m;

                        m = mono_marshal_method_from_wrapper (method);
                        g_assert (m);
                        g_assert (m != method);
                        encode_method_ref (acfg, m, p, &p);
                        break;
                }
                case MONO_WRAPPER_MANAGED_TO_MANAGED: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);

                        if (info->subtype == WRAPPER_SUBTYPE_ELEMENT_ADDR) {
                                encode_value (info->d.element_addr.rank, p, &p);
                                encode_value (info->d.element_addr.elem_size, p, &p);
                        } else if (info->subtype == WRAPPER_SUBTYPE_STRING_CTOR) {
                                encode_method_ref (acfg, info->d.string_ctor.method, p, &p);
                        } else {
                                g_assert_not_reached ();
                        }
                        break;
                }
                case MONO_WRAPPER_CASTCLASS: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);
                        break;
                }
                case MONO_WRAPPER_RUNTIME_INVOKE: {
                        g_assert (info);
                        encode_value (info->subtype, p, &p);
                        if (info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_DIRECT || info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_VIRTUAL)
                                encode_method_ref (acfg, info->d.runtime_invoke.method, p, &p);
                        else if (info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_NORMAL)
                                encode_signature (acfg, info->d.runtime_invoke.sig, p, &p);
                        break;
                }
                case MONO_WRAPPER_DELEGATE_INVOKE:
                case MONO_WRAPPER_DELEGATE_BEGIN_INVOKE:
                case MONO_WRAPPER_DELEGATE_END_INVOKE: {
                        if (method->is_inflated) {
                                /* These wrappers are identified by their class */
                                encode_value (1, p, &p);
                                encode_klass_ref (acfg, method->klass, p, &p);
                        } else {
                                MonoMethodSignature *sig = mono_method_signature_internal (method);
                                WrapperInfo *info = mono_marshal_get_wrapper_info (method);

                                encode_value (0, p, &p);
                                if (method->wrapper_type == MONO_WRAPPER_DELEGATE_INVOKE)
                                        encode_value (info ? info->subtype : 0, p, &p);
                                encode_signature (acfg, sig, p, &p);
                        }
                        break;
                }
                case MONO_WRAPPER_NATIVE_TO_MANAGED: {
                        g_assert (info);
                        encode_method_ref (acfg, info->d.native_to_managed.method, p, &p);
                        encode_klass_ref (acfg, info->d.native_to_managed.klass, p, &p);
                        break;
                }
                default:
                        g_assert_not_reached ();
                }
        } else if (mono_method_signature_internal (method)->is_inflated) {
                /* 
                 * This is a generic method, find the original token which referenced it and
                 * encode that.
                 * Obtain the token from information recorded by the JIT.
                 */
                ji = (MonoJumpInfoToken *)g_hash_table_lookup (acfg->token_info_hash, method);
                if (ji) {
                        image_index = get_image_index (acfg, ji->image);
                        g_assert (image_index < MAX_IMAGE_INDEX);
                        token = ji->token;

                        encode_value ((MONO_AOT_METHODREF_METHODSPEC << 24), p, &p);
                        encode_value (image_index, p, &p);
                        encode_value (token, p, &p);
                } else if (g_hash_table_lookup (acfg->method_blob_hash, method)) {
                        /* Already emitted as part of an rgctx fetch */
                        guint32 offset = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_blob_hash, method));
                        offset --;

                        encode_value ((MONO_AOT_METHODREF_BLOB_INDEX << 24), p, &p);
                        encode_value (offset, p, &p);
                } else {
                        MonoMethod *declaring;
                        MonoGenericContext *context = mono_method_get_context (method);

                        g_assert (method->is_inflated);
                        declaring = ((MonoMethodInflated*)method)->declaring;

                        /*
                         * This might be a non-generic method of a generic instance, which 
                         * doesn't have a token since the reference is generated by the JIT 
                         * like Nullable:Box/Unbox, or by generic sharing.
                         */
                        encode_value ((MONO_AOT_METHODREF_GINST << 24), p, &p);
                        /* Encode the klass */
                        encode_klass_ref (acfg, method->klass, p, &p);
                        /* Encode the method */
                        image_index = get_image_index (acfg, m_class_get_image (method->klass));
                        g_assert (image_index < MAX_IMAGE_INDEX);
                        g_assert (declaring->token);
                        token = declaring->token;
                        g_assert (mono_metadata_token_table (token) == MONO_TABLE_METHOD);
                        encode_value (image_index, p, &p);
                        encode_value (mono_metadata_token_index (token), p, &p);
                        encode_generic_context (acfg, context, p, &p);
                }
        } else if (token == 0) {
                /* This might be a method of a constructed type like int[,].Set */
                /* Obtain the token from information recorded by the JIT */
                ji = (MonoJumpInfoToken *)g_hash_table_lookup (acfg->token_info_hash, method);
                if (ji) {
                        image_index = get_image_index (acfg, ji->image);
                        g_assert (image_index < MAX_IMAGE_INDEX);
                        token = ji->token;

                        encode_value ((MONO_AOT_METHODREF_METHODSPEC << 24), p, &p);
                        encode_value (image_index, p, &p);
                        encode_value (token, p, &p);
                } else {
                        /* Array methods */
                        g_assert (m_class_get_rank (method->klass));

                        /* Encode directly */
                        encode_value ((MONO_AOT_METHODREF_ARRAY << 24), p, &p);
                        encode_klass_ref (acfg, method->klass, p, &p);
                        if (!strcmp (method->name, ".ctor") && mono_method_signature_internal (method)->param_count == m_class_get_rank (method->klass))
                                encode_value (0, p, &p);
                        else if (!strcmp (method->name, ".ctor") && mono_method_signature_internal (method)->param_count == m_class_get_rank (method->klass) * 2)
                                encode_value (1, p, &p);
                        else if (!strcmp (method->name, "Get"))
                                encode_value (2, p, &p);
                        else if (!strcmp (method->name, "Address"))
                                encode_value (3, p, &p);
                        else if (!strcmp (method->name, "Set"))
                                encode_value (4, p, &p);
                        else
                                g_assert_not_reached ();
                }
        } else {
                g_assert (mono_metadata_token_table (token) == MONO_TABLE_METHOD);

                if (image_index >= MONO_AOT_METHODREF_MIN) {
                        encode_value ((MONO_AOT_METHODREF_LARGE_IMAGE_INDEX << 24), p, &p);
                        encode_value (image_index, p, &p);
                        encode_value (mono_metadata_token_index (token), p, &p);
                } else {
                        encode_value ((image_index << 24) | mono_metadata_token_index (token), p, &p);
                }
        }

        acfg->stats.method_ref_count++;
        acfg->stats.method_ref_size += p - buf;

        *endbuf = p;
}

static guint32
get_shared_method_ref (MonoAotCompile *acfg, MonoMethod *method)
{
        guint32 offset = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_blob_hash, method));
        if (!offset) {
                guint8 *buf2, *p2;

                buf2 = (guint8 *)g_malloc (1024);
                p2 = buf2;

                encode_method_ref (acfg, method, p2, &p2);
                g_assert (p2 - buf2 < 1024);

                offset = add_to_blob (acfg, buf2, p2 - buf2);
                g_free (buf2);

                g_hash_table_insert (acfg->method_blob_hash, method, GUINT_TO_POINTER (offset + 1));
        } else {
                offset --;
        }
        return offset;
}

static gint
compare_patches (gconstpointer a, gconstpointer b)
{
        int i, j;

        i = (*(MonoJumpInfo**)a)->ip.i;
        j = (*(MonoJumpInfo**)b)->ip.i;

        if (i < j)
                return -1;
        else
                if (i > j)
                        return 1;
        else
                return 0;
}

static G_GNUC_UNUSED char*
patch_to_string (MonoJumpInfo *patch_info)
{
        GString *str;

        str = g_string_new ("");

        g_string_append_printf (str, "%s(", get_patch_name (patch_info->type));

        switch (patch_info->type) {
        case MONO_PATCH_INFO_VTABLE:
                mono_type_get_desc (str, m_class_get_byval_arg (patch_info->data.klass), TRUE);
                break;
        default:
                break;
        }
        g_string_append_printf (str, ")");
        return g_string_free (str, FALSE);
}

/*
 * is_plt_patch:
 *
 *   Return whenever PATCH_INFO refers to a direct call, and thus requires a
 * PLT entry.
 */
static inline gboolean
is_plt_patch (MonoJumpInfo *patch_info)
{
        switch (patch_info->type) {
        case MONO_PATCH_INFO_METHOD:
        case MONO_PATCH_INFO_JIT_ICALL_ID:
        case MONO_PATCH_INFO_JIT_ICALL_ADDR:
        case MONO_PATCH_INFO_ICALL_ADDR_CALL:
        case MONO_PATCH_INFO_RGCTX_FETCH:
        case MONO_PATCH_INFO_SPECIFIC_TRAMPOLINE_LAZY_FETCH_ADDR:
                return TRUE;
        case MONO_PATCH_INFO_JIT_ICALL_ADDR_NOCALL:
        default:
                return FALSE;
        }
}

/*
 * get_plt_symbol:
 *
 *   Return the symbol identifying the plt entry PLT_OFFSET.
 */
static char*
get_plt_symbol (MonoAotCompile *acfg, int plt_offset, MonoJumpInfo *patch_info)
{
#ifdef TARGET_MACH
        /* 
         * The Apple linker reorganizes object files, so it doesn't like branches to local
         * labels, since those have no relocations.
         */
        return g_strdup_printf ("%sp_%d", acfg->llvm_label_prefix, plt_offset);
#else
        return g_strdup_printf ("%sp_%d", acfg->temp_prefix, plt_offset);
#endif
}

/*
 * get_plt_entry:
 *
 *   Return a PLT entry which belongs to the method identified by PATCH_INFO.
 */
static MonoPltEntry*
get_plt_entry (MonoAotCompile *acfg, MonoJumpInfo *patch_info)
{
        MonoPltEntry *res;
        gboolean synchronized = FALSE;
        static int synchronized_symbol_idx;

        if (!is_plt_patch (patch_info))
                return NULL;

        if (!acfg->patch_to_plt_entry [patch_info->type])
                acfg->patch_to_plt_entry [patch_info->type] = g_hash_table_new (mono_patch_info_hash, mono_patch_info_equal);
        res = (MonoPltEntry *)g_hash_table_lookup (acfg->patch_to_plt_entry [patch_info->type], patch_info);

        if (!acfg->llvm && patch_info->type == MONO_PATCH_INFO_METHOD && (patch_info->data.method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)) {
                /* 
                 * Allocate a separate PLT slot for each such patch, since some plt
                 * entries will refer to the method itself, and some will refer to the
                 * wrapper.
                 */
                res = NULL;
                synchronized = TRUE;
        }

        if (!res) {
                MonoJumpInfo *new_ji;

                new_ji = mono_patch_info_dup_mp (acfg->mempool, patch_info);

                res = (MonoPltEntry *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoPltEntry));
                res->plt_offset = acfg->plt_offset;
                res->ji = new_ji;
                res->symbol = get_plt_symbol (acfg, res->plt_offset, patch_info);
                if (acfg->aot_opts.write_symbols)
                        res->debug_sym = get_plt_entry_debug_sym (acfg, res->ji, acfg->plt_entry_debug_sym_cache);
                if (synchronized) {
                        /* Avoid duplicate symbols because we don't cache */
                        res->symbol = g_strdup_printf ("%s_%d", res->symbol, synchronized_symbol_idx);
                        if (res->debug_sym)
                                res->debug_sym = g_strdup_printf ("%s_%d", res->debug_sym, synchronized_symbol_idx);
                        synchronized_symbol_idx ++;
                }

                if (res->debug_sym)
                        res->llvm_symbol = g_strdup_printf ("%s_%s_llvm", res->symbol, res->debug_sym);
                else
                        res->llvm_symbol = g_strdup_printf ("%s_llvm", res->symbol);
                if (strstr (res->llvm_symbol, acfg->temp_prefix) == res->llvm_symbol) {
                        /* The llvm symbol shouldn't be temporary, since the llvm generated object file references it */
                        char *tmp = res->llvm_symbol;
                        res->llvm_symbol = g_strdup (res->llvm_symbol + strlen (acfg->temp_prefix));
                        g_free (tmp);
                }

                g_hash_table_insert (acfg->patch_to_plt_entry [new_ji->type], new_ji, res);

                g_hash_table_insert (acfg->plt_offset_to_entry, GUINT_TO_POINTER (res->plt_offset), res);

                //g_assert (mono_patch_info_equal (patch_info, new_ji));
                //mono_print_ji (patch_info); printf ("\n");
                //g_hash_table_print_stats (acfg->patch_to_plt_entry);

                acfg->plt_offset ++;
        }

        return res;
}

static guint32
lookup_got_offset (MonoAotCompile *acfg, gboolean llvm, MonoJumpInfo *ji)
{
        guint32 got_offset;
        GotInfo *info = llvm ? &acfg->llvm_got_info : &acfg->got_info;

        got_offset = GPOINTER_TO_UINT (g_hash_table_lookup (info->patch_to_got_offset_by_type [ji->type], ji));
        if (got_offset)
                return got_offset - 1;
        g_assert_not_reached ();
}

/**
 * get_got_offset:
 *
 *   Returns the offset of the GOT slot where the runtime object resulting from resolving
 * JI could be found if it exists, otherwise allocates a new one.
 */
static guint32
get_got_offset (MonoAotCompile *acfg, gboolean llvm, MonoJumpInfo *ji)
{
        guint32 got_offset;
        GotInfo *info = llvm ? &acfg->llvm_got_info : &acfg->got_info;

        got_offset = GPOINTER_TO_UINT (g_hash_table_lookup (info->patch_to_got_offset_by_type [ji->type], ji));
        if (got_offset)
                return got_offset - 1;

        if (llvm) {
                got_offset = acfg->llvm_got_offset;
                acfg->llvm_got_offset ++;
        } else {
                got_offset = acfg->got_offset;
                acfg->got_offset ++;
        }

        acfg->stats.got_slots ++;
        acfg->stats.got_slot_types [ji->type] ++;

        g_hash_table_insert (info->patch_to_got_offset, ji, GUINT_TO_POINTER (got_offset + 1));
        g_hash_table_insert (info->patch_to_got_offset_by_type [ji->type], ji, GUINT_TO_POINTER (got_offset + 1));
        g_ptr_array_add (info->got_patches, ji);

        return got_offset;
}

/* Add a method to the list of methods which need to be emitted */
static void
add_method_with_index (MonoAotCompile *acfg, MonoMethod *method, int index, gboolean extra)
{
        g_assert (method);
        if (!g_hash_table_lookup (acfg->method_indexes, method)) {
                g_ptr_array_add (acfg->methods, method);
                g_hash_table_insert (acfg->method_indexes, method, GUINT_TO_POINTER (index + 1));
                acfg->nmethods = acfg->methods->len + 1;
        }

        if (method->wrapper_type || extra) {
                int token = mono_metadata_token_index (method->token) - 1;
                if (token < 0)
                        acfg->nextra_methods++;
                g_ptr_array_add (acfg->extra_methods, method);
        }
}

static gboolean
prefer_gsharedvt_method (MonoAotCompile *acfg, MonoMethod *method)
{
        /* One instantiation with valuetypes is generated for each async method */
        if (m_class_get_image (method->klass) == mono_defaults.corlib && (!strcmp (m_class_get_name (method->klass), "AsyncMethodBuilderCore") || !strcmp (m_class_get_name (method->klass), "AsyncVoidMethodBuilder")))
                return TRUE;
        else
                return FALSE;
}

static guint32
get_method_index (MonoAotCompile *acfg, MonoMethod *method)
{
        int index = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_indexes, method));
        
        g_assert (index);

        return index - 1;
}

static int
add_method_full (MonoAotCompile *acfg, MonoMethod *method, gboolean extra, int depth)
{
        int index;

        index = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_indexes, method));
        if (index)
                return index - 1;

        index = acfg->method_index;
        add_method_with_index (acfg, method, index, extra);

        g_ptr_array_add (acfg->method_order, GUINT_TO_POINTER (index));

        g_hash_table_insert (acfg->method_depth, method, GUINT_TO_POINTER (depth));

        acfg->method_index ++;

        return index;
}

static int
add_method (MonoAotCompile *acfg, MonoMethod *method)
{
        return add_method_full (acfg, method, FALSE, 0);
}

static void
mono_dedup_cache_method (MonoAotCompile *acfg, MonoMethod *method)
{
        g_assert (acfg->dedup_stats);

        char *name = mono_aot_get_mangled_method_name (method);
        g_assert (name);

        // For stats
        char *stats_name = g_strdup (name);

        g_assert (acfg->dedup_cache);

        if (!g_hash_table_lookup (acfg->dedup_cache, name)) {
                // This AOTCompile owns this method
                // We do this to decide whether to write it to disk
                // during a dedup run (first phase, where we skip).
                //
                // If never changed, then maybe can avoid a recompile
                // of the cache.
                //
                // Files not read in during last phase.
                acfg->dedup_cache_changed = TRUE;

                // owns name
                g_hash_table_insert (acfg->dedup_cache, name, method);
        } else {
                // owns name
                g_free (name);
        }

        guint count = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->dedup_stats, stats_name));
        count++;
        g_hash_table_insert (acfg->dedup_stats, stats_name, GUINT_TO_POINTER (count));
}

static void
add_extra_method_with_depth (MonoAotCompile *acfg, MonoMethod *method, int depth)
{
        ERROR_DECL (error);

        if (mono_method_is_generic_sharable_full (method, TRUE, TRUE, FALSE)) {
                method = mini_get_shared_method_full (method, SHARE_MODE_NONE, error);
                if (!is_ok (error)) {
                        /* vtype constraint */
                        mono_error_cleanup (error);
                        return;
                }
        } else if ((acfg->opts & MONO_OPT_GSHAREDVT) && prefer_gsharedvt_method (acfg, method) && mono_method_is_generic_sharable_full (method, FALSE, FALSE, TRUE)) {
                /* Use the gsharedvt version */
                method = mini_get_shared_method_full (method, SHARE_MODE_GSHAREDVT, error);
                mono_error_assert_ok (error);
        }

        if ((acfg->aot_opts.dedup || acfg->aot_opts.dedup_include) && mono_aot_can_dedup (method)) {
                mono_dedup_cache_method (acfg, method);

                if (!acfg->dedup_emit_mode)
                        return;
        }

        if (acfg->aot_opts.log_generics)
                aot_printf (acfg, "%*sAdding method %s.\n", depth, "", mono_method_get_full_name (method));

        add_method_full (acfg, method, TRUE, depth);
}

static void
add_extra_method (MonoAotCompile *acfg, MonoMethod *method)
{
        add_extra_method_with_depth (acfg, method, 0);
}

static void
add_jit_icall_wrapper (MonoAotCompile *acfg, MonoJitICallInfo *callinfo)
{
        if (!callinfo->sig)
                return;

        g_assert (callinfo->name && callinfo->func);

        add_method (acfg, mono_marshal_get_icall_wrapper (callinfo, TRUE));
}

#if ENABLE_LLVM

static void
add_lazy_init_wrappers (MonoAotCompile *acfg)
{
        add_method (acfg, mono_marshal_get_aot_init_wrapper (AOT_INIT_METHOD));
        add_method (acfg, mono_marshal_get_aot_init_wrapper (AOT_INIT_METHOD_GSHARED_MRGCTX));
        add_method (acfg, mono_marshal_get_aot_init_wrapper (AOT_INIT_METHOD_GSHARED_VTABLE));
        add_method (acfg, mono_marshal_get_aot_init_wrapper (AOT_INIT_METHOD_GSHARED_THIS));
}

#endif

static MonoMethod*
get_runtime_invoke_sig (MonoMethodSignature *sig)
{
        MonoMethodBuilder *mb;
        MonoMethod *m;

        mb = mono_mb_new (mono_defaults.object_class, "FOO", MONO_WRAPPER_NONE);
        m = mono_mb_create_method (mb, sig, 16);
        MonoMethod *invoke = mono_marshal_get_runtime_invoke (m, FALSE);
        mono_mb_free (mb);
        return invoke;
}

static MonoMethod*
get_runtime_invoke (MonoAotCompile *acfg, MonoMethod *method, gboolean virtual_)
{
        return mono_marshal_get_runtime_invoke (method, virtual_);
}

static gboolean
can_marshal_struct (MonoClass *klass)
{
        MonoClassField *field;
        gboolean can_marshal = TRUE;
        gpointer iter = NULL;
        MonoMarshalType *info;
        int i;

        if (mono_class_is_auto_layout (klass))
                return FALSE;

        info = mono_marshal_load_type_info (klass);

        /* Only allow a few field types to avoid asserts in the marshalling code */
        while ((field = mono_class_get_fields_internal (klass, &iter))) {
                if ((field->type->attrs & FIELD_ATTRIBUTE_STATIC))
                        continue;

                switch (field->type->type) {
                case MONO_TYPE_I4:
                case MONO_TYPE_U4:
                case MONO_TYPE_I1:
                case MONO_TYPE_U1:
                case MONO_TYPE_BOOLEAN:
                case MONO_TYPE_I2:
                case MONO_TYPE_U2:
                case MONO_TYPE_CHAR:
                case MONO_TYPE_I8:
                case MONO_TYPE_U8:
                case MONO_TYPE_I:
                case MONO_TYPE_U:
                case MONO_TYPE_PTR:
                case MONO_TYPE_R4:
                case MONO_TYPE_R8:
                case MONO_TYPE_STRING:
                        break;
                case MONO_TYPE_VALUETYPE:
                        if (!m_class_is_enumtype (mono_class_from_mono_type_internal (field->type)) && !can_marshal_struct (mono_class_from_mono_type_internal (field->type)))
                                can_marshal = FALSE;
                        break;
                case MONO_TYPE_SZARRAY: {
                        gboolean has_mspec = FALSE;

                        if (info) {
                                for (i = 0; i < info->num_fields; ++i) {
                                        if (info->fields [i].field == field && info->fields [i].mspec)
                                                has_mspec = TRUE;
                                }
                        }
                        if (!has_mspec)
                                can_marshal = FALSE;
                        break;
                }
                default:
                        can_marshal = FALSE;
                        break;
                }
        }

        /* Special cases */
        /* Its hard to compute whenever these can be marshalled or not */
        if (!strcmp (m_class_get_name_space (klass), "System.Net.NetworkInformation.MacOsStructs") && strcmp (m_class_get_name (klass), "sockaddr_dl"))
                return TRUE;

        return can_marshal;
}

static void
create_gsharedvt_inst (MonoAotCompile *acfg, MonoMethod *method, MonoGenericContext *ctx)
{
        /* Create a vtype instantiation */
        MonoGenericContext shared_context;
        MonoType **args;
        MonoGenericInst *inst;
        MonoGenericContainer *container;
        MonoClass **constraints;
        int i;

        memset (ctx, 0, sizeof (MonoGenericContext));

        if (mono_class_is_gtd (method->klass)) {
                shared_context = mono_class_get_generic_container (method->klass)->context;
                inst = shared_context.class_inst;

                args = g_new0 (MonoType*, inst->type_argc);
                for (i = 0; i < inst->type_argc; ++i) {
                        args [i] = mono_get_int_type ();
                }
                ctx->class_inst = mono_metadata_get_generic_inst (inst->type_argc, args);
        }
        if (method->is_generic) {
                container = mono_method_get_generic_container (method);
                g_assert (!container->is_anonymous && container->is_method);
                shared_context = container->context;
                inst = shared_context.method_inst;

                args = g_new0 (MonoType*, inst->type_argc);
                for (i = 0; i < container->type_argc; ++i) {
                        MonoGenericParamInfo *info = mono_generic_param_info (&container->type_params [i]);
                        gboolean ref_only = FALSE;

                        if (info && info->constraints) {
                                constraints = info->constraints;

                                while (*constraints) {
                                        MonoClass *cklass = *constraints;
                                        if (!(cklass == mono_defaults.object_class || (m_class_get_image (cklass) == mono_defaults.corlib && !strcmp (m_class_get_name (cklass), "ValueType"))))
                                                /* Inflaring the method with our vtype would not be valid */
                                                ref_only = TRUE;
                                        constraints ++;
                                }
                        }

                        if (ref_only)
                                args [i] = mono_get_object_type ();
                        else
                                args [i] = mono_get_int_type ();
                }
                ctx->method_inst = mono_metadata_get_generic_inst (inst->type_argc, args);
        }
}

static void
add_gc_wrappers (MonoAotCompile *acfg)
{
        MonoMethod *m;
        /* Managed Allocators */
        int nallocators = mono_gc_get_managed_allocator_types ();
        for (int i = 0; i < nallocators; ++i) {
                if ((m = mono_gc_get_managed_allocator_by_type (i, MANAGED_ALLOCATOR_REGULAR)))
                        add_method (acfg, m);
                if ((m = mono_gc_get_managed_allocator_by_type (i, MANAGED_ALLOCATOR_SLOW_PATH)))
                        add_method (acfg, m);
                if ((m = mono_gc_get_managed_allocator_by_type (i, MANAGED_ALLOCATOR_PROFILER)))
                        add_method (acfg, m);
        }

        /* write barriers */
        if (mono_gc_is_moving ()) {
                add_method (acfg, mono_gc_get_specific_write_barrier (FALSE));
                add_method (acfg, mono_gc_get_specific_write_barrier (TRUE));
        }
}

static gboolean
contains_disable_reflection_attribute (MonoCustomAttrInfo *cattr)
{
        for (int i = 0; i < cattr->num_attrs; ++i) {
                MonoCustomAttrEntry *attr = &cattr->attrs [i];

                if (!attr->ctor)
                        return FALSE;

                if (strcmp (m_class_get_name_space (attr->ctor->klass), "System.Runtime.CompilerServices"))
                        return FALSE;

                if (strcmp (m_class_get_name (attr->ctor->klass), "DisablePrivateReflectionAttribute"))
                        return FALSE;
        }

        return TRUE;
}

gboolean
mono_aot_can_specialize (MonoMethod *method)
{
        if (!method)
                return FALSE;

        if (method->wrapper_type != MONO_WRAPPER_NONE)
                return FALSE;

        // If it's not private, we can't specialize
        if ((method->flags & METHOD_ATTRIBUTE_MEMBER_ACCESS_MASK) != METHOD_ATTRIBUTE_PRIVATE)
                return FALSE;

        // If it has the attribute disabling the specialization, we can't specialize
        //
        // Set by linker, indicates that the method can be found through reflection
        // and that call-site specialization shouldn't be done.
        //
        // Important that this attribute is used for *nothing else*
        //
        // If future authors make use of it (to disable more optimizations),
        // change this place to use a new attribute.
        ERROR_DECL (cattr_error);
        MonoCustomAttrInfo *cattr = mono_custom_attrs_from_class_checked (method->klass, cattr_error);

        if (!is_ok (cattr_error)) {
                mono_error_cleanup (cattr_error);
                goto cleanup_false;
        } else if (cattr && contains_disable_reflection_attribute (cattr)) {
                goto cleanup_true;
        }

        cattr = mono_custom_attrs_from_method_checked (method, cattr_error);

        if (!is_ok (cattr_error)) {
                mono_error_cleanup (cattr_error);
                goto cleanup_false;
        } else if (cattr && contains_disable_reflection_attribute (cattr)) {
                goto cleanup_true;
        } else {
                goto cleanup_false;
        }

cleanup_false:
        if (cattr)
                mono_custom_attrs_free (cattr);
        return FALSE;

cleanup_true:
        if (cattr)
                mono_custom_attrs_free (cattr);
        return TRUE;
}

static void
add_wrappers (MonoAotCompile *acfg)
{
        MonoMethod *method, *m;
        int i, j;
        MonoMethodSignature *sig, *csig;
        guint32 token;

        /* 
         * FIXME: Instead of AOTing all the wrappers, it might be better to redesign them
         * so there is only one wrapper of a given type, or inlining their contents into their
         * callers.
         */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                MonoMethod *method;
                guint32 token = MONO_TOKEN_METHOD_DEF | (i + 1);
                gboolean skip = FALSE;

                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                report_loader_error (acfg, error, TRUE, "Failed to load method token 0x%x due to %s\n", i, mono_error_get_message (error));

                if ((method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) ||
                        (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
                        (method->flags & METHOD_ATTRIBUTE_ABSTRACT))
                        skip = TRUE;

                /* Skip methods which can not be handled by get_runtime_invoke () */
                sig = mono_method_signature_internal (method);
                if (!sig)
                        continue;
                if ((sig->ret->type == MONO_TYPE_PTR) ||
                        (sig->ret->type == MONO_TYPE_TYPEDBYREF))
                        skip = TRUE;
                if (mono_class_is_open_constructed_type (sig->ret))
                        skip = TRUE;

                for (j = 0; j < sig->param_count; j++) {
                        if (sig->params [j]->type == MONO_TYPE_TYPEDBYREF)
                                skip = TRUE;
                        if (mono_class_is_open_constructed_type (sig->params [j]))
                                skip = TRUE;
                }

#ifdef MONO_ARCH_DYN_CALL_SUPPORTED
                if (!mono_class_is_contextbound (method->klass)) {
                        MonoDynCallInfo *info = mono_arch_dyn_call_prepare (sig);
                        gboolean has_nullable = FALSE;

                        for (j = 0; j < sig->param_count; j++) {
                                if (sig->params [j]->type == MONO_TYPE_GENERICINST && mono_class_is_nullable (mono_class_from_mono_type_internal (sig->params [j])))
                                        has_nullable = TRUE;
                        }

                        if (info && !has_nullable && !acfg->aot_opts.llvm_only) {
                                /* Supported by the dynamic runtime-invoke wrapper */
                                skip = TRUE;
                        }
                        if (info)
                                mono_arch_dyn_call_free (info);
                }
#endif

                if (acfg->aot_opts.llvm_only)
                        /* Supported by the gsharedvt based runtime-invoke wrapper */
                        skip = TRUE;

                if (!skip) {
                        //printf ("%s\n", mono_method_full_name (method, TRUE));
                        add_method (acfg, get_runtime_invoke (acfg, method, FALSE));
                }
        }

        if (mono_is_corlib_image (acfg->image->assembly->image)) {
                /* Runtime invoke wrappers */

                MonoType *void_type = mono_get_void_type ();
                MonoType *string_type = m_class_get_byval_arg (mono_defaults.string_class);

                /* void runtime-invoke () [.cctor] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 0);
                csig->ret = void_type;
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* void runtime-invoke () [Finalize] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 0);
                csig->hasthis = 1;
                csig->ret = void_type;
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* void runtime-invoke (string) [exception ctor] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 1);
                csig->hasthis = 1;
                csig->ret = void_type;
                csig->params [0] = string_type;
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* void runtime-invoke (string, string) [exception ctor] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
                csig->hasthis = 1;
                csig->ret = void_type;
                csig->params [0] = string_type;
                csig->params [1] = string_type;
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* string runtime-invoke () [Exception.ToString ()] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 0);
                csig->hasthis = 1;
                csig->ret = string_type;
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* void runtime-invoke (string, Exception) [exception ctor] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 2);
                csig->hasthis = 1;
                csig->ret = void_type;
                csig->params [0] = string_type;
                csig->params [1] = m_class_get_byval_arg (mono_defaults.exception_class);
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* Assembly runtime-invoke (string, Assembly, bool) [DoAssemblyResolve] */
                csig = mono_metadata_signature_alloc (mono_defaults.corlib, 3);
                csig->hasthis = 1;
                csig->ret = m_class_get_byval_arg (mono_class_load_from_name (mono_defaults.corlib, "System.Reflection", "Assembly"));
                csig->params [0] = string_type;
                csig->params [1] = m_class_get_byval_arg (mono_class_load_from_name (mono_defaults.corlib, "System.Reflection", "Assembly"));
                csig->params [2] = m_class_get_byval_arg (mono_defaults.boolean_class);
                add_method (acfg, get_runtime_invoke_sig (csig));

                /* runtime-invoke used by finalizers */
                add_method (acfg, get_runtime_invoke (acfg, get_method_nofail (mono_defaults.object_class, "Finalize", 0, 0), TRUE));

                /* This is used by mono_runtime_capture_context () */
                method = mono_get_context_capture_method ();
                if (method)
                        add_method (acfg, get_runtime_invoke (acfg, method, FALSE));

#ifdef MONO_ARCH_DYN_CALL_SUPPORTED
                if (!acfg->aot_opts.llvm_only)
                        add_method (acfg, mono_marshal_get_runtime_invoke_dynamic ());
#endif

                /* These are used by mono_jit_runtime_invoke () to calls gsharedvt out wrappers */
                if (acfg->aot_opts.llvm_only) {
                        int variants;

                        /* Create simplified signatures which match the signature used by the gsharedvt out wrappers */
                        for (variants = 0; variants < 4; ++variants) {
                                for (i = 0; i < 40; ++i) {
                                        sig = mini_get_gsharedvt_out_sig_wrapper_signature ((variants & 1) > 0, (variants & 2) > 0, i);
                                        add_extra_method (acfg, mono_marshal_get_runtime_invoke_for_sig (sig));

                                        g_free (sig);
                                }
                        }
                }

                /* stelemref */
                add_method (acfg, mono_marshal_get_stelemref ());

                add_gc_wrappers (acfg);

                /* Stelemref wrappers */
                {
                        MonoMethod **wrappers;
                        int nwrappers;

                        wrappers = mono_marshal_get_virtual_stelemref_wrappers (&nwrappers);
                        for (i = 0; i < nwrappers; ++i)
                                add_method (acfg, wrappers [i]);
                        g_free (wrappers);
                }

                /* castclass_with_check wrapper */
                add_method (acfg, mono_marshal_get_castclass_with_cache ());
                /* isinst_with_check wrapper */
                add_method (acfg, mono_marshal_get_isinst_with_cache ());

                /* JIT icall wrappers */
                /* FIXME: locking - this is "safe" as full-AOT threads don't mutate the icall data */
                for (int i = 0; i < MONO_JIT_ICALL_count; ++i)
                        add_jit_icall_wrapper (acfg, mono_find_jit_icall_info ((MonoJitICallId)i));
        }

        /* 
         * remoting-invoke-with-check wrappers are very frequent, so avoid emitting them,
         * we use the original method instead at runtime.
         * Since full-aot doesn't support remoting, this is not a problem.
         */
#if 0
        /* remoting-invoke wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                MonoMethodSignature *sig;
                
                token = MONO_TOKEN_METHOD_DEF | (i + 1);
                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                g_assert (is_ok (error)); /* FIXME don't swallow the error */

                sig = mono_method_signature_internal (method);

                if (sig->hasthis && (method->klass->marshalbyref || method->klass == mono_defaults.object_class)) {
                        m = mono_marshal_get_remoting_invoke_with_check (method);

                        add_method (acfg, m);
                }
        }
#endif

        /* delegate-invoke wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPEDEF].rows; ++i) {
                ERROR_DECL (error);
                MonoClass *klass;
                
                token = MONO_TOKEN_TYPE_DEF | (i + 1);
                klass = mono_class_get_checked (acfg->image, token, error);

                if (!klass) {
                        mono_error_cleanup (error);
                        continue;
                }

                if (!m_class_is_delegate (klass) || klass == mono_defaults.delegate_class || klass == mono_defaults.multicastdelegate_class)
                        continue;

                if (!mono_class_is_gtd (klass)) {
                        method = mono_get_delegate_invoke_internal (klass);

                        m = mono_marshal_get_delegate_invoke (method, NULL);

                        add_method (acfg, m);

                        method = try_get_method_nofail (klass, "BeginInvoke", -1, 0);
                        if (method)
                                add_method (acfg, mono_marshal_get_delegate_begin_invoke (method));

                        method = try_get_method_nofail (klass, "EndInvoke", -1, 0);
                        if (method)
                                add_method (acfg, mono_marshal_get_delegate_end_invoke (method));

                        MonoCustomAttrInfo *cattr;
                        cattr = mono_custom_attrs_from_class_checked (klass, error);
                        if (!is_ok (error)) {
                                mono_error_cleanup (error);
                                g_assert (!cattr);
                                continue;
                        }

                        if (cattr) {
                                int j;

                                for (j = 0; j < cattr->num_attrs; ++j)
                                        if (cattr->attrs [j].ctor && (!strcmp (m_class_get_name (cattr->attrs [j].ctor->klass), "MonoNativeFunctionWrapperAttribute") || !strcmp (m_class_get_name (cattr->attrs [j].ctor->klass), "UnmanagedFunctionPointerAttribute")))
                                                break;
                                if (j < cattr->num_attrs) {
                                        MonoMethod *invoke;
                                        MonoMethod *wrapper;
                                        MonoMethod *del_invoke;

                                        /* Add wrappers needed by mono_ftnptr_to_delegate () */
                                        invoke = mono_get_delegate_invoke_internal (klass);
                                        wrapper = mono_marshal_get_native_func_wrapper_aot (klass);
                                        del_invoke = mono_marshal_get_delegate_invoke_internal (invoke, FALSE, TRUE, wrapper);
                                        add_method (acfg, wrapper);
                                        add_method (acfg, del_invoke);
                                }
                                mono_custom_attrs_free (cattr);
                        }
                } else if ((acfg->opts & MONO_OPT_GSHAREDVT) && mono_class_is_gtd (klass)) {
                        ERROR_DECL (error);
                        MonoGenericContext ctx;
                        MonoMethod *inst, *gshared;

                        /*
                         * Emit gsharedvt versions of the generic delegate-invoke wrappers
                         */
                        /* Invoke */
                        method = mono_get_delegate_invoke_internal (klass);
                        create_gsharedvt_inst (acfg, method, &ctx);

                        inst = mono_class_inflate_generic_method_checked (method, &ctx, error);
                        g_assert (is_ok (error)); /* FIXME don't swallow the error */

                        m = mono_marshal_get_delegate_invoke (inst, NULL);
                        g_assert (m->is_inflated);

                        gshared = mini_get_shared_method_full (m, SHARE_MODE_GSHAREDVT, error);
                        mono_error_assert_ok (error);

                        add_extra_method (acfg, gshared);

                        /* begin-invoke */
                        method = mono_get_delegate_begin_invoke_internal (klass);
                        if (method) {
                                create_gsharedvt_inst (acfg, method, &ctx);

                                inst = mono_class_inflate_generic_method_checked (method, &ctx, error);
                                g_assert (is_ok (error)); /* FIXME don't swallow the error */

                                m = mono_marshal_get_delegate_begin_invoke (inst);
                                g_assert (m->is_inflated);

                                gshared = mini_get_shared_method_full (m, SHARE_MODE_GSHAREDVT, error);
                                mono_error_assert_ok (error);

                                add_extra_method (acfg, gshared);
                        }

                        /* end-invoke */
                        method = mono_get_delegate_end_invoke_internal (klass);
                        if (method) {
                                create_gsharedvt_inst (acfg, method, &ctx);

                                inst = mono_class_inflate_generic_method_checked (method, &ctx, error);
                                g_assert (is_ok (error)); /* FIXME don't swallow the error */

                                m = mono_marshal_get_delegate_end_invoke (inst);
                                g_assert (m->is_inflated);

                                gshared = mini_get_shared_method_full (m, SHARE_MODE_GSHAREDVT, error);
                                mono_error_assert_ok (error);

                                add_extra_method (acfg, gshared);
                        }
                }
        }

        /* array access wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPESPEC].rows; ++i) {
                ERROR_DECL (error);
                MonoClass *klass;
                
                token = MONO_TOKEN_TYPE_SPEC | (i + 1);
                klass = mono_class_get_checked (acfg->image, token, error);

                if (!klass) {
                        mono_error_cleanup (error);
                        continue;
                }

                if (m_class_get_rank (klass) && MONO_TYPE_IS_PRIMITIVE (m_class_get_byval_arg (m_class_get_element_class (klass)))) {
                        MonoMethod *m, *wrapper;

                        /* Add runtime-invoke wrappers too */

                        m = get_method_nofail (klass, "Get", -1, 0);
                        g_assert (m);
                        wrapper = mono_marshal_get_array_accessor_wrapper (m);
                        add_extra_method (acfg, wrapper);
                        if (!acfg->aot_opts.llvm_only)
                                add_extra_method (acfg, get_runtime_invoke (acfg, wrapper, FALSE));

                        m = get_method_nofail (klass, "Set", -1, 0);
                        g_assert (m);
                        wrapper = mono_marshal_get_array_accessor_wrapper (m);
                        add_extra_method (acfg, wrapper);
                        if (!acfg->aot_opts.llvm_only)
                                add_extra_method (acfg, get_runtime_invoke (acfg, wrapper, FALSE));
                }
        }

        /* Synchronized wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                token = MONO_TOKEN_METHOD_DEF | (i + 1);
                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                report_loader_error (acfg, error, TRUE, "Failed to load method token 0x%x due to %s\n", i, mono_error_get_message (error));

                if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
                        if (method->is_generic) {
                                // FIXME:
                        } else if ((acfg->opts & MONO_OPT_GSHAREDVT) && mono_class_is_gtd (method->klass)) {
                                ERROR_DECL (error);
                                MonoGenericContext ctx;
                                MonoMethod *inst, *gshared, *m;

                                /*
                                 * Create a generic wrapper for a generic instance, and AOT that.
                                 */
                                create_gsharedvt_inst (acfg, method, &ctx);
                                inst = mono_class_inflate_generic_method_checked (method, &ctx, error);
                                g_assert (is_ok (error)); /* FIXME don't swallow the error */
                                m = mono_marshal_get_synchronized_wrapper (inst);
                                g_assert (m->is_inflated);
                                gshared = mini_get_shared_method_full (m, SHARE_MODE_GSHAREDVT, error);
                                mono_error_assert_ok (error);

                                add_method (acfg, gshared);
                        } else {
                                add_method (acfg, mono_marshal_get_synchronized_wrapper (method));
                        }
                }
        }

        /* pinvoke wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                MonoMethod *method;
                guint32 token = MONO_TOKEN_METHOD_DEF | (i + 1);

                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                report_loader_error (acfg, error, TRUE, "Failed to load method token 0x%x due to %s\n", i, mono_error_get_message (error));

                if ((method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) ||
                        (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL)) {
                        add_method (acfg, mono_marshal_get_native_wrapper (method, TRUE, TRUE));
                }

                if (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) {
                        if (acfg->aot_opts.llvm_only) {
                                /* The wrappers have a different signature (hasthis is not set) so need to add this too */
                                add_gsharedvt_wrappers (acfg, mono_method_signature_internal (method), FALSE, TRUE, FALSE);
                        }
                }
        }
 
        /* native-to-managed wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                MonoMethod *method;
                guint32 token = MONO_TOKEN_METHOD_DEF | (i + 1);
                MonoCustomAttrInfo *cattr;
                int j;

                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                report_loader_error (acfg, error, TRUE, "Failed to load method token 0x%x due to %s\n", i, mono_error_get_message (error));

                /* 
                 * Only generate native-to-managed wrappers for methods which have an
                 * attribute named MonoPInvokeCallbackAttribute. We search for the attribute by
                 * name to avoid defining a new assembly to contain it.
                 */
                cattr = mono_custom_attrs_from_method_checked (method, error);
                if (!is_ok (error)) {
                        char *name = mono_method_get_full_name (method);
                        report_loader_error (acfg, error, TRUE, "Failed to load custom attributes from method %s due to %s\n", name, mono_error_get_message (error));
                        g_free (name);
                }

                if (cattr) {
                        for (j = 0; j < cattr->num_attrs; ++j)
                                if (cattr->attrs [j].ctor && !strcmp (m_class_get_name (cattr->attrs [j].ctor->klass), "MonoPInvokeCallbackAttribute"))
                                        break;
                        if (j < cattr->num_attrs) {
                                MonoCustomAttrEntry *e = &cattr->attrs [j];
                                MonoMethodSignature *sig = mono_method_signature_internal (e->ctor);
                                const char *p = (const char*)e->data;
                                const char *named;
                                int slen, num_named, named_type;
                                char *n;
                                MonoType *t;
                                MonoClass *klass;
                                char *export_name = NULL;
                                MonoMethod *wrapper;

                                /* this cannot be enforced by the C# compiler so we must give the user some warning before aborting */
                                if (!(method->flags & METHOD_ATTRIBUTE_STATIC)) {
                                        g_warning ("AOT restriction: Method '%s' must be static since it is decorated with [MonoPInvokeCallback]. See https://docs.microsoft.com/xamarin/ios/internals/limitations#reverse-callbacks",
                                                mono_method_full_name (method, TRUE));
                                        exit (1);
                                }

                                g_assert (sig->param_count == 1);
                                g_assert (sig->params [0]->type == MONO_TYPE_CLASS && !strcmp (m_class_get_name (mono_class_from_mono_type_internal (sig->params [0])), "Type"));

                                /* 
                                 * Decode the cattr manually since we can't create objects
                                 * during aot compilation.
                                 */
                                        
                                /* Skip prolog */
                                p += 2;

                                /* From load_cattr_value () in reflection.c */
                                slen = mono_metadata_decode_value (p, &p);
                                n = (char *)g_memdup (p, slen + 1);
                                n [slen] = 0;
                                t = mono_reflection_type_from_name_checked (n, acfg->image, error);
                                g_assert (t);
                                mono_error_assert_ok (error);
                                g_free (n);

                                klass = mono_class_from_mono_type_internal (t);
                                g_assert (m_class_get_parent (klass) == mono_defaults.multicastdelegate_class);

                                p += slen;

                                num_named = read16 (p);
                                p += 2;

                                g_assert (num_named < 2);
                                if (num_named == 1) {
                                        int name_len;
                                        char *name;

                                        /* parse ExportSymbol attribute */
                                        named = p;
                                        named_type = *named;
                                        named += 1;
                                        /* data_type = *named; */
                                        named += 1;

                                        name_len = mono_metadata_decode_blob_size (named, &named);
                                        name = (char *)g_malloc (name_len + 1);
                                        memcpy (name, named, name_len);
                                        name [name_len] = 0;
                                        named += name_len;

                                        g_assert (named_type == 0x54);
                                        g_assert (!strcmp (name, "ExportSymbol"));

                                        /* load_cattr_value (), string case */
MONO_DISABLE_WARNING (4310) // cast truncates constant value
                                        g_assert (*named != (char)0xFF);
MONO_RESTORE_WARNING
                                        slen = mono_metadata_decode_value (named, &named);
                                        export_name = (char *)g_malloc (slen + 1);
                                        memcpy (export_name, named, slen);
                                        export_name [slen] = 0;
                                        named += slen;
                                }

                                wrapper = mono_marshal_get_managed_wrapper (method, klass, 0, error);
                                mono_error_assert_ok (error);

                                add_method (acfg, wrapper);
                                if (export_name)
                                        g_hash_table_insert (acfg->export_names, wrapper, export_name);
                        }
                        g_free (cattr);
                }

                if ((method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) ||
                        (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL)) {
                        add_method (acfg, mono_marshal_get_native_wrapper (method, TRUE, TRUE));
                }
        }

        /* StructureToPtr/PtrToStructure wrappers */
        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPEDEF].rows; ++i) {
                ERROR_DECL (error);
                MonoClass *klass;
                
                token = MONO_TOKEN_TYPE_DEF | (i + 1);
                klass = mono_class_get_checked (acfg->image, token, error);

                if (!klass) {
                        mono_error_cleanup (error);
                        continue;
                }

                if (m_class_is_valuetype (klass) && !mono_class_is_gtd (klass) && can_marshal_struct (klass) &&
                        !(m_class_get_nested_in (klass) && strstr (m_class_get_name (m_class_get_nested_in (klass)), "<PrivateImplementationDetails>") == m_class_get_name (m_class_get_nested_in (klass)))) {
                        add_method (acfg, mono_marshal_get_struct_to_ptr (klass));
                        add_method (acfg, mono_marshal_get_ptr_to_struct (klass));
                }
        }
}

static gboolean
has_type_vars (MonoClass *klass)
{
        if ((m_class_get_byval_arg (klass)->type == MONO_TYPE_VAR) || (m_class_get_byval_arg (klass)->type == MONO_TYPE_MVAR))
                return TRUE;
        if (m_class_get_rank (klass))
                return has_type_vars (m_class_get_element_class (klass));
        if (mono_class_is_ginst (klass)) {
                MonoGenericContext *context = &mono_class_get_generic_class (klass)->context;
                if (context->class_inst) {
                        int i;

                        for (i = 0; i < context->class_inst->type_argc; ++i)
                                if (has_type_vars (mono_class_from_mono_type_internal (context->class_inst->type_argv [i])))
                                        return TRUE;
                }
        }
        if (mono_class_is_gtd (klass))
                return TRUE;
        return FALSE;
}

static gboolean
is_vt_inst (MonoGenericInst *inst)
{
        int i;

        for (i = 0; i < inst->type_argc; ++i) {
                MonoType *t = inst->type_argv [i];
                if (MONO_TYPE_ISSTRUCT (t) || t->type == MONO_TYPE_VALUETYPE)
                        return TRUE;
        }
        return FALSE;
}

static gboolean
method_has_type_vars (MonoMethod *method)
{
        if (has_type_vars (method->klass))
                return TRUE;

        if (method->is_inflated) {
                MonoGenericContext *context = mono_method_get_context (method);
                if (context->method_inst) {
                        int i;

                        for (i = 0; i < context->method_inst->type_argc; ++i)
                                if (has_type_vars (mono_class_from_mono_type_internal (context->method_inst->type_argv [i])))
                                        return TRUE;
                }
        }
        return FALSE;
}

static
gboolean mono_aot_mode_is_full (MonoAotOptions *opts)
{
        return opts->mode == MONO_AOT_MODE_FULL;
}

static
gboolean mono_aot_mode_is_interp (MonoAotOptions *opts)
{
        return opts->interp;
}

static
gboolean mono_aot_mode_is_hybrid (MonoAotOptions *opts)
{
        return opts->mode == MONO_AOT_MODE_HYBRID;
}

static void add_generic_class_with_depth (MonoAotCompile *acfg, MonoClass *klass, int depth, const char *ref);

static void
add_generic_class (MonoAotCompile *acfg, MonoClass *klass, gboolean force, const char *ref)
{
        /* This might lead to a huge code blowup so only do it if neccesary */
        if (!mono_aot_mode_is_full (&acfg->aot_opts) && !mono_aot_mode_is_hybrid (&acfg->aot_opts) && !force)
                return;

        add_generic_class_with_depth (acfg, klass, 0, ref);
}

static gboolean
check_type_depth (MonoType *t, int depth)
{
        int i;

        if (depth > 8)
                return TRUE;

        switch (t->type) {
        case MONO_TYPE_GENERICINST: {
                MonoGenericClass *gklass = t->data.generic_class;
                MonoGenericInst *ginst = gklass->context.class_inst;

                if (ginst) {
                        for (i = 0; i < ginst->type_argc; ++i) {
                                if (check_type_depth (ginst->type_argv [i], depth + 1))
                                        return TRUE;
                        }
                }
                break;
        }
        default:
                break;
        }

        return FALSE;
}

static void
add_types_from_method_header (MonoAotCompile *acfg, MonoMethod *method);

/*
 * add_generic_class:
 *
 *   Add all methods of a generic class.
 */
static void
add_generic_class_with_depth (MonoAotCompile *acfg, MonoClass *klass, int depth, const char *ref)
{
        MonoMethod *method;
        MonoClassField *field;
        gpointer iter;
        gboolean use_gsharedvt = FALSE;

        if (!acfg->ginst_hash)
                acfg->ginst_hash = g_hash_table_new (NULL, NULL);

        mono_class_init_internal (klass);

        if (mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->context.class_inst->is_open)
                return;

        if (has_type_vars (klass))
                return;

        if (!mono_class_is_ginst (klass) && !m_class_get_rank (klass))
                return;

        if (mono_class_has_failure (klass))
                return;

        if (!acfg->ginst_hash)
                acfg->ginst_hash = g_hash_table_new (NULL, NULL);

        if (g_hash_table_lookup (acfg->ginst_hash, klass))
                return;

        if (check_type_depth (m_class_get_byval_arg (klass), 0))
                return;

        if (acfg->aot_opts.log_generics) {
                char *s = mono_type_full_name (m_class_get_byval_arg (klass));
                aot_printf (acfg, "%*sAdding generic instance %s [%s].\n", depth, "", s, ref);
                g_free (s);
        }

        g_hash_table_insert (acfg->ginst_hash, klass, klass);

        /*
         * Use gsharedvt for generic collections with vtype arguments to avoid code blowup.
         * Enable this only for some classes since gsharedvt might not support all methods.
         */
        if ((acfg->opts & MONO_OPT_GSHAREDVT) && m_class_get_image (klass) == mono_defaults.corlib && mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->context.class_inst && is_vt_inst (mono_class_get_generic_class (klass)->context.class_inst) &&
                (!strcmp (m_class_get_name (klass), "Dictionary`2") || !strcmp (m_class_get_name (klass), "List`1") || !strcmp (m_class_get_name (klass), "ReadOnlyCollection`1")))
                use_gsharedvt = TRUE;

        iter = NULL;
        while ((method = mono_class_get_methods (klass, &iter))) {
                if ((acfg->opts & MONO_OPT_GSHAREDVT) && method->is_inflated && mono_method_get_context (method)->method_inst) {
                        /*
                         * This is partial sharing, and we can't handle it yet
                         */
                        continue;
                }
                
                if (mono_method_is_generic_sharable_full (method, FALSE, FALSE, use_gsharedvt)) {
                        /* Already added */
                        add_types_from_method_header (acfg, method);
                        continue;
                }

                if (method->is_generic)
                        /* FIXME: */
                        continue;

                /*
                 * FIXME: Instances which are referenced by these methods are not added,
                 * for example Array.Resize<int> for List<int>.Add ().
                 */
                add_extra_method_with_depth (acfg, method, depth + 1);
        }

        iter = NULL;
        while ((field = mono_class_get_fields_internal (klass, &iter))) {
                if (field->type->type == MONO_TYPE_GENERICINST)
                        add_generic_class_with_depth (acfg, mono_class_from_mono_type_internal (field->type), depth + 1, "field");
        }

        if (m_class_is_delegate (klass)) {
                method = mono_get_delegate_invoke_internal (klass);

                method = mono_marshal_get_delegate_invoke (method, NULL);

                if (acfg->aot_opts.log_generics)
                        aot_printf (acfg, "%*sAdding method %s.\n", depth, "", mono_method_get_full_name (method));

                add_method (acfg, method);
        }

        /* Add superclasses */
        if (m_class_get_parent (klass))
                add_generic_class_with_depth (acfg, m_class_get_parent (klass), depth, "parent");

        const char *klass_name = m_class_get_name (klass);
        const char *klass_name_space = m_class_get_name_space (klass);
        const gboolean in_corlib = m_class_get_image (klass) == mono_defaults.corlib;
        /* 
         * For ICollection<T>, add instances of the helper methods
         * in Array, since a T[] could be cast to ICollection<T>.
         */
        if (in_corlib && !strcmp (klass_name_space, "System.Collections.Generic") &&
                (!strcmp(klass_name, "ICollection`1") || !strcmp (klass_name, "IEnumerable`1") || !strcmp (klass_name, "IList`1") || !strcmp (klass_name, "IEnumerator`1") || !strcmp (klass_name, "IReadOnlyList`1"))) {
                MonoClass *tclass = mono_class_from_mono_type_internal (mono_class_get_generic_class (klass)->context.class_inst->type_argv [0]);
                MonoClass *array_class = mono_class_create_bounded_array (tclass, 1, FALSE);
                gpointer iter;
                char *name_prefix;

                if (!strcmp (klass_name, "IEnumerator`1"))
                        name_prefix = g_strdup_printf ("%s.%s", klass_name_space, "IEnumerable`1");
                else
                        name_prefix = g_strdup_printf ("%s.%s", klass_name_space, klass_name);

                /* Add the T[]/InternalEnumerator class */
                if (!strcmp (klass_name, "IEnumerable`1") || !strcmp (klass_name, "IEnumerator`1")) {
                        ERROR_DECL (error);
                        MonoClass *nclass;

                        iter = NULL;
                        while ((nclass = mono_class_get_nested_types (m_class_get_parent (array_class), &iter))) {
                                if (!strcmp (m_class_get_name (nclass), "InternalEnumerator`1"))
                                        break;
                        }
                        g_assert (nclass);
                        nclass = mono_class_inflate_generic_class_checked (nclass, mono_generic_class_get_context (mono_class_get_generic_class (klass)), error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */
                        add_generic_class (acfg, nclass, FALSE, "ICollection<T>");
                }

                iter = NULL;
                while ((method = mono_class_get_methods (array_class, &iter))) {
                        if (!strncmp (method->name, name_prefix, strlen (name_prefix))) {
                                MonoMethod *m = mono_aot_get_array_helper_from_wrapper (method);

                                if (m->is_inflated && !mono_method_is_generic_sharable_full (m, FALSE, FALSE, FALSE))
                                        add_extra_method_with_depth (acfg, m, depth);
                        }
                }

                g_free (name_prefix);
        }

        /* Add an instance of GenericComparer<T> which is created dynamically by Comparer<T> */
        if (in_corlib && !strcmp (klass_name_space, "System.Collections.Generic") && !strcmp (klass_name, "Comparer`1")) {
                ERROR_DECL (error);
                MonoClass *tclass = mono_class_from_mono_type_internal (mono_class_get_generic_class (klass)->context.class_inst->type_argv [0]);
                MonoClass *icomparable, *gcomparer, *icomparable_inst;
                MonoGenericContext ctx;
                MonoType *args [16];

                memset (&ctx, 0, sizeof (ctx));

                icomparable = mono_class_load_from_name (mono_defaults.corlib, "System", "IComparable`1");

                args [0] = m_class_get_byval_arg (tclass);
                ctx.class_inst = mono_metadata_get_generic_inst (1, args);

                icomparable_inst = mono_class_inflate_generic_class_checked (icomparable, &ctx, error);
                mono_error_assert_ok (error); /* FIXME don't swallow the error */

                if (mono_class_is_assignable_from_internal (icomparable_inst, tclass)) {
                        MonoClass *gcomparer_inst;
                        gcomparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "GenericComparer`1");
                        gcomparer_inst = mono_class_inflate_generic_class_checked (gcomparer, &ctx, error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */

                        add_generic_class (acfg, gcomparer_inst, FALSE, "Comparer<T>");
                }
        }

        /* Add an instance of GenericEqualityComparer<T> which is created dynamically by EqualityComparer<T> */
        if (in_corlib && !strcmp (klass_name_space, "System.Collections.Generic") && !strcmp (klass_name, "EqualityComparer`1")) {
                ERROR_DECL (error);
                MonoClass *tclass = mono_class_from_mono_type_internal (mono_class_get_generic_class (klass)->context.class_inst->type_argv [0]);
                MonoClass *iface, *gcomparer, *iface_inst;
                MonoGenericContext ctx;
                MonoType *args [16];

                memset (&ctx, 0, sizeof (ctx));

                iface = mono_class_load_from_name (mono_defaults.corlib, "System", "IEquatable`1");
                g_assert (iface);
                args [0] = m_class_get_byval_arg (tclass);
                ctx.class_inst = mono_metadata_get_generic_inst (1, args);

                iface_inst = mono_class_inflate_generic_class_checked (iface, &ctx, error);
                mono_error_assert_ok (error); /* FIXME don't swallow the error */

                if (mono_class_is_assignable_from_internal (iface_inst, tclass)) {
                        MonoClass *gcomparer_inst;
                        ERROR_DECL (error);

                        gcomparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "GenericEqualityComparer`1");
                        gcomparer_inst = mono_class_inflate_generic_class_checked (gcomparer, &ctx, error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */
                        add_generic_class (acfg, gcomparer_inst, FALSE, "EqualityComparer<T>");
                }
        }

        /* Add an instance of EnumComparer<T> which is created dynamically by EqualityComparer<T> for enums */
        if (in_corlib && !strcmp (klass_name_space, "System.Collections.Generic") && !strcmp (klass_name, "EqualityComparer`1")) {
                MonoClass *enum_comparer;
                MonoClass *tclass = mono_class_from_mono_type_internal (mono_class_get_generic_class (klass)->context.class_inst->type_argv [0]);
                MonoGenericContext ctx;
                MonoType *args [16];

                if (m_class_is_enumtype (tclass)) {
                        MonoClass *enum_comparer_inst;
                        ERROR_DECL (error);

                        memset (&ctx, 0, sizeof (ctx));
                        args [0] = m_class_get_byval_arg (tclass);
                        ctx.class_inst = mono_metadata_get_generic_inst (1, args);

                        enum_comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "EnumEqualityComparer`1");
                        enum_comparer_inst = mono_class_inflate_generic_class_checked (enum_comparer, &ctx, error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */
                        add_generic_class (acfg, enum_comparer_inst, FALSE, "EqualityComparer<T>");
                }
        }

        /* Add an instance of ObjectComparer<T> which is created dynamically by Comparer<T> for enums */
        if (in_corlib && !strcmp (klass_name_space, "System.Collections.Generic") && !strcmp (klass_name, "Comparer`1")) {
                MonoClass *comparer;
                MonoClass *tclass = mono_class_from_mono_type_internal (mono_class_get_generic_class (klass)->context.class_inst->type_argv [0]);
                MonoGenericContext ctx;
                MonoType *args [16];

                if (m_class_is_enumtype (tclass)) {
                        MonoClass *comparer_inst;
                        ERROR_DECL (error);

                        memset (&ctx, 0, sizeof (ctx));
                        args [0] = m_class_get_byval_arg (tclass);
                        ctx.class_inst = mono_metadata_get_generic_inst (1, args);

                        comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "ObjectComparer`1");
                        comparer_inst = mono_class_inflate_generic_class_checked (comparer, &ctx, error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */
                        add_generic_class (acfg, comparer_inst, FALSE, "Comparer<T>");
                }
        }
}

static void
add_instances_of (MonoAotCompile *acfg, MonoClass *klass, MonoType **insts, int ninsts, gboolean force)
{
        int i;
        MonoGenericContext ctx;
        MonoType *args [16];

        if (acfg->aot_opts.no_instances)
                return;

        memset (&ctx, 0, sizeof (ctx));

        for (i = 0; i < ninsts; ++i) {
                ERROR_DECL (error);
                MonoClass *generic_inst;
                args [0] = insts [i];
                ctx.class_inst = mono_metadata_get_generic_inst (1, args);
                generic_inst = mono_class_inflate_generic_class_checked (klass, &ctx, error);
                mono_error_assert_ok (error); /* FIXME don't swallow the error */
                add_generic_class (acfg, generic_inst, force, "");
        }
}

static void
add_types_from_method_header (MonoAotCompile *acfg, MonoMethod *method)
{
        ERROR_DECL (error);
        MonoMethodHeader *header;
        MonoMethodSignature *sig;
        int j, depth;

        depth = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_depth, method));

        sig = mono_method_signature_internal (method);

        if (sig) {
                for (j = 0; j < sig->param_count; ++j)
                        if (sig->params [j]->type == MONO_TYPE_GENERICINST)
                                add_generic_class_with_depth (acfg, mono_class_from_mono_type_internal (sig->params [j]), depth + 1, "arg");
        }

        header = mono_method_get_header_checked (method, error);

        if (header) {
                for (j = 0; j < header->num_locals; ++j)
                        if (header->locals [j]->type == MONO_TYPE_GENERICINST)
                                add_generic_class_with_depth (acfg, mono_class_from_mono_type_internal (header->locals [j]), depth + 1, "local");
                mono_metadata_free_mh (header);
        } else {
                mono_error_cleanup (error); /* FIXME report the error */
        }

}

/*
 * add_generic_instances:
 *
 *   Add instances referenced by the METHODSPEC/TYPESPEC table.
 */
static void
add_generic_instances (MonoAotCompile *acfg)
{
        int i;
        guint32 token;
        MonoMethod *method;
        MonoGenericContext *context;

        if (acfg->aot_opts.no_instances)
                return;

        for (i = 0; i < acfg->image->tables [MONO_TABLE_METHODSPEC].rows; ++i) {
                ERROR_DECL (error);
                token = MONO_TOKEN_METHOD_SPEC | (i + 1);
                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);

                if (!method) {
                        aot_printerrf (acfg, "Failed to load methodspec 0x%x due to %s.\n", token, mono_error_get_message (error));
                        aot_printerrf (acfg, "Run with MONO_LOG_LEVEL=debug for more information.\n");
                        mono_error_cleanup (error);
                        continue;
                }

                if (m_class_get_image (method->klass) != acfg->image)
                        continue;

                context = mono_method_get_context (method);

                if (context && ((context->class_inst && context->class_inst->is_open)))
                        continue;

                /*
                 * For open methods, create an instantiation which can be passed to the JIT.
                 * FIXME: Handle class_inst as well.
                 */
                if (context && context->method_inst && context->method_inst->is_open) {
                        ERROR_DECL (error);
                        MonoGenericContext shared_context;
                        MonoGenericInst *inst;
                        MonoType **type_argv;
                        int i;
                        MonoMethod *declaring_method;
                        gboolean supported = TRUE;

                        /* Check that the context doesn't contain open constructed types */
                        if (context->class_inst) {
                                inst = context->class_inst;
                                for (i = 0; i < inst->type_argc; ++i) {
                                        if (MONO_TYPE_IS_REFERENCE (inst->type_argv [i]) || inst->type_argv [i]->type == MONO_TYPE_VAR || inst->type_argv [i]->type == MONO_TYPE_MVAR)
                                                continue;
                                        if (mono_class_is_open_constructed_type (inst->type_argv [i]))
                                                supported = FALSE;
                                }
                        }
                        if (context->method_inst) {
                                inst = context->method_inst;
                                for (i = 0; i < inst->type_argc; ++i) {
                                        if (MONO_TYPE_IS_REFERENCE (inst->type_argv [i]) || inst->type_argv [i]->type == MONO_TYPE_VAR || inst->type_argv [i]->type == MONO_TYPE_MVAR)
                                                continue;
                                        if (mono_class_is_open_constructed_type (inst->type_argv [i]))
                                                supported = FALSE;
                                }
                        }

                        if (!supported)
                                continue;

                        memset (&shared_context, 0, sizeof (MonoGenericContext));

                        inst = context->class_inst;
                        if (inst) {
                                type_argv = g_new0 (MonoType*, inst->type_argc);
                                for (i = 0; i < inst->type_argc; ++i) {
                                        if (MONO_TYPE_IS_REFERENCE (inst->type_argv [i]) || inst->type_argv [i]->type == MONO_TYPE_VAR || inst->type_argv [i]->type == MONO_TYPE_MVAR)
                                                type_argv [i] = mono_get_object_type ();
                                        else
                                                type_argv [i] = inst->type_argv [i];
                                }
                                
                                shared_context.class_inst = mono_metadata_get_generic_inst (inst->type_argc, type_argv);
                                g_free (type_argv);
                        }

                        inst = context->method_inst;
                        if (inst) {
                                type_argv = g_new0 (MonoType*, inst->type_argc);
                                for (i = 0; i < inst->type_argc; ++i) {
                                        if (MONO_TYPE_IS_REFERENCE (inst->type_argv [i]) || inst->type_argv [i]->type == MONO_TYPE_VAR || inst->type_argv [i]->type == MONO_TYPE_MVAR)
                                                type_argv [i] = mono_get_object_type ();
                                        else
                                                type_argv [i] = inst->type_argv [i];
                                }

                                shared_context.method_inst = mono_metadata_get_generic_inst (inst->type_argc, type_argv);
                                g_free (type_argv);
                        }

                        if (method->is_generic || mono_class_is_gtd (method->klass))
                                declaring_method = method;
                        else
                                declaring_method = mono_method_get_declaring_generic_method (method);

                        method = mono_class_inflate_generic_method_checked (declaring_method, &shared_context, error);
                        g_assert (is_ok (error)); /* FIXME don't swallow the error */
                }

                /* 
                 * If the method is fully sharable, it was already added in place of its
                 * generic definition.
                 */
                if (mono_method_is_generic_sharable_full (method, FALSE, FALSE, FALSE))
                        continue;

                /*
                 * FIXME: Partially shared methods are not shared here, so we end up with
                 * many identical methods.
                 */
                add_extra_method (acfg, method);
        }

        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPESPEC].rows; ++i) {
                ERROR_DECL (error);
                MonoClass *klass;

                token = MONO_TOKEN_TYPE_SPEC | (i + 1);

                klass = mono_class_get_checked (acfg->image, token, error);
                if (!klass || m_class_get_rank (klass)) {
                        mono_error_cleanup (error);
                        continue;
                }

                add_generic_class (acfg, klass, FALSE, "typespec");
        }

        /* Add types of args/locals */
        for (i = 0; i < acfg->methods->len; ++i) {
                method = (MonoMethod *)g_ptr_array_index (acfg->methods, i);
                add_types_from_method_header (acfg, method);
        }

        if (acfg->image == mono_defaults.corlib) {
                MonoClass *klass;
                MonoType *insts [256];
                int ninsts = 0;

                MonoType *byte_type = m_class_get_byval_arg (mono_defaults.byte_class);
                MonoType *sbyte_type = m_class_get_byval_arg (mono_defaults.sbyte_class);
                MonoType *int16_type = m_class_get_byval_arg (mono_defaults.int16_class);
                MonoType *uint16_type = m_class_get_byval_arg (mono_defaults.uint16_class);
                MonoType *int32_type = mono_get_int32_type ();
                MonoType *uint32_type = m_class_get_byval_arg (mono_defaults.uint32_class);
                MonoType *int64_type = m_class_get_byval_arg (mono_defaults.int64_class);
                MonoType *uint64_type = m_class_get_byval_arg (mono_defaults.uint64_class);
                MonoType *object_type = mono_get_object_type ();

                insts [ninsts ++] = byte_type;
                insts [ninsts ++] = sbyte_type;
                insts [ninsts ++] = int16_type;
                insts [ninsts ++] = uint16_type;
                insts [ninsts ++] = int32_type;
                insts [ninsts ++] = uint32_type;
                insts [ninsts ++] = int64_type;
                insts [ninsts ++] = uint64_type;
                insts [ninsts ++] = m_class_get_byval_arg (mono_defaults.single_class);
                insts [ninsts ++] = m_class_get_byval_arg (mono_defaults.double_class);
                insts [ninsts ++] = m_class_get_byval_arg (mono_defaults.char_class);
                insts [ninsts ++] = m_class_get_byval_arg (mono_defaults.boolean_class);

                /* Add GenericComparer<T> instances for primitive types for Enum.ToString () */
                klass = mono_class_try_load_from_name (acfg->image, "System.Collections.Generic", "GenericComparer`1");
                if (klass)
                        add_instances_of (acfg, klass, insts, ninsts, TRUE);
                klass = mono_class_try_load_from_name (acfg->image, "System.Collections.Generic", "GenericEqualityComparer`1");
                if (klass)
                        add_instances_of (acfg, klass, insts, ninsts, TRUE);

                /* Add instances of EnumEqualityComparer which are created by EqualityComparer<T> for enums */
                {
                        MonoClass *enum_comparer;
                        MonoType *insts [16];
                        int ninsts;

                        ninsts = 0;
                        insts [ninsts ++] = int32_type;
                        insts [ninsts ++] = uint32_type;
                        insts [ninsts ++] = uint16_type;
                        insts [ninsts ++] = byte_type;
                        enum_comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "EnumEqualityComparer`1");
                        add_instances_of (acfg, enum_comparer, insts, ninsts, FALSE);

                        ninsts = 0;
                        insts [ninsts ++] = int16_type;
                        enum_comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "ShortEnumEqualityComparer`1");
                        add_instances_of (acfg, enum_comparer, insts, ninsts, FALSE);

                        ninsts = 0;
                        insts [ninsts ++] = sbyte_type;
                        enum_comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "SByteEnumEqualityComparer`1");
                        add_instances_of (acfg, enum_comparer, insts, ninsts, FALSE);

                        enum_comparer = mono_class_load_from_name (mono_defaults.corlib, "System.Collections.Generic", "LongEnumEqualityComparer`1");
                        ninsts = 0;
                        insts [ninsts ++] = int64_type;
                        insts [ninsts ++] = uint64_type;
                        add_instances_of (acfg, enum_comparer, insts, ninsts, FALSE);
                }

                /* Add instances of the array generic interfaces for primitive types */
                /* This will add instances of the InternalArray_ helper methods in Array too */
                klass = mono_class_try_load_from_name (acfg->image, "System.Collections.Generic", "ICollection`1");
                if (klass)
                        add_instances_of (acfg, klass, insts, ninsts, TRUE);

                klass = mono_class_try_load_from_name (acfg->image, "System.Collections.Generic", "IList`1");
                if (klass)
                        add_instances_of (acfg, klass, insts, ninsts, TRUE);

                klass = mono_class_try_load_from_name (acfg->image, "System.Collections.Generic", "IEnumerable`1");
                if (klass)
                        add_instances_of (acfg, klass, insts, ninsts, TRUE);

                /* 
                 * Add a managed-to-native wrapper of Array.GetGenericValueImpl<object>, which is
                 * used for all instances of GetGenericValueImpl by the AOT runtime.
                 */
                {
                        ERROR_DECL (error);
                        MonoGenericContext ctx;
                        MonoType *args [16];
                        MonoMethod *get_method;
                        MonoClass *array_klass = m_class_get_parent (mono_class_create_array (mono_defaults.object_class, 1));

                        get_method = mono_class_get_method_from_name_checked (array_klass, "GetGenericValueImpl", 2, 0, error);
                        mono_error_assert_ok (error);

                        if (get_method) {
                                memset (&ctx, 0, sizeof (ctx));
                                args [0] = object_type;
                                ctx.method_inst = mono_metadata_get_generic_inst (1, args);
                                add_extra_method (acfg, mono_marshal_get_native_wrapper (mono_class_inflate_generic_method_checked (get_method, &ctx, error), TRUE, TRUE));
                                mono_error_assert_ok (error); /* FIXME don't swallow the error */
                        }
                }

                /* Same for CompareExchange<T>/Exchange<T> */
                {
                        MonoGenericContext ctx;
                        MonoType *args [16];
                        MonoMethod *m;
                        MonoClass *interlocked_klass = mono_class_load_from_name (mono_defaults.corlib, "System.Threading", "Interlocked");
                        gpointer iter = NULL;

                        while ((m = mono_class_get_methods (interlocked_klass, &iter))) {
                                if ((!strcmp (m->name, "CompareExchange") || !strcmp (m->name, "Exchange")) && m->is_generic) {
                                        ERROR_DECL (error);
                                        memset (&ctx, 0, sizeof (ctx));
                                        args [0] = object_type;
                                        ctx.method_inst = mono_metadata_get_generic_inst (1, args);
                                        add_extra_method (acfg, mono_marshal_get_native_wrapper (mono_class_inflate_generic_method_checked (m, &ctx, error), TRUE, TRUE));
                                        g_assert (is_ok (error)); /* FIXME don't swallow the error */
                                }
                        }
                }

                /* object[] accessor wrappers. */
                for (i = 1; i < 4; ++i) {
                        MonoClass *obj_array_class = mono_class_create_array (mono_defaults.object_class, i);
                        MonoMethod *m;

                        m = get_method_nofail (obj_array_class, "Get", i, 0);
                        g_assert (m);

                        m = mono_marshal_get_array_accessor_wrapper (m);
                        add_extra_method (acfg, m);

                        m = get_method_nofail (obj_array_class, "Address", i, 0);
                        g_assert (m);

                        m = mono_marshal_get_array_accessor_wrapper (m);
                        add_extra_method (acfg, m);

                        m = get_method_nofail (obj_array_class, "Set", i + 1, 0);
                        g_assert (m);

                        m = mono_marshal_get_array_accessor_wrapper (m);
                        add_extra_method (acfg, m);
                }
        }
}

static char *
decode_direct_icall_symbol_name_attribute (MonoMethod *method)
{
        ERROR_DECL (error);

        int j = 0;
        char *symbol_name = NULL;

        MonoCustomAttrInfo *cattr = mono_custom_attrs_from_method_checked (method, error);
        if (is_ok(error) && cattr) {
                for (j = 0; j < cattr->num_attrs; j++)
                        if (cattr->attrs [j].ctor && !strcmp (m_class_get_name (cattr->attrs [j].ctor->klass), "MonoDirectICallSymbolNameAttribute"))
                                break;

                if (j < cattr->num_attrs) {
                        MonoCustomAttrEntry *e = &cattr->attrs [j];
                        MonoMethodSignature *sig = mono_method_signature_internal (e->ctor);
                        if (e->data && sig && sig->param_count == 1 && sig->params [0]->type == MONO_TYPE_STRING) {
                                /*
                                * Decode the cattr manually since we can't create objects
                                * during aot compilation.
                                */

                                /* Skip prolog */
                                const char *p = ((const char*)e->data) + 2;
                                int slen = mono_metadata_decode_value (p, &p);

                                symbol_name = (char *)g_memdup (p, slen + 1);
                                if (symbol_name)
                                        symbol_name [slen] = 0;
                        }
                }
        }

        return symbol_name;
}
static const char*
lookup_external_icall_symbol_name_aot (MonoMethod *method)
{
        g_assert (method_to_external_icall_symbol_name);

        gpointer key, value;
        if (g_hash_table_lookup_extended (method_to_external_icall_symbol_name, method, &key, &value))
                return (const char*)value;

        char *symbol_name = decode_direct_icall_symbol_name_attribute (method);
        g_hash_table_insert (method_to_external_icall_symbol_name, method, symbol_name);

        return symbol_name;
}

static const char*
lookup_icall_symbol_name_aot (MonoMethod *method)
{
        const char * symbol_name = mono_lookup_icall_symbol (method);
        if (!symbol_name)
                symbol_name = lookup_external_icall_symbol_name_aot (method);

        return symbol_name;
}

gboolean
mono_aot_direct_icalls_enabled_for_method (MonoCompile *cfg, MonoMethod *method)
{
        gboolean enable_icall = FALSE;
        if (cfg->compile_aot)
                enable_icall = lookup_external_icall_symbol_name_aot (method) ? TRUE : FALSE;
        else
                enable_icall = FALSE;

        return enable_icall;
}

/*
 * is_direct_callable:
 *
 *   Return whenever the method identified by JI is directly callable without 
 * going through the PLT.
 */
static gboolean
is_direct_callable (MonoAotCompile *acfg, MonoMethod *method, MonoJumpInfo *patch_info)
{
        if ((patch_info->type == MONO_PATCH_INFO_METHOD) && (m_class_get_image (patch_info->data.method->klass) == acfg->image)) {
                MonoCompile *callee_cfg = (MonoCompile *)g_hash_table_lookup (acfg->method_to_cfg, patch_info->data.method);
                if (callee_cfg) {
                        gboolean direct_callable = TRUE;

                        if (direct_callable && (acfg->aot_opts.dedup || acfg->aot_opts.dedup_include) && mono_aot_can_dedup (patch_info->data.method))
                                direct_callable = FALSE;

                        if (direct_callable && (!acfg->llvm || acfg->aot_opts.llvm_disable_self_init) && !(!callee_cfg->has_got_slots && mono_class_is_before_field_init (callee_cfg->method->klass)))
                                direct_callable = FALSE;

                        if (direct_callable && !strcmp (callee_cfg->method->name, ".cctor"))
                                direct_callable = FALSE;

                        //
                        // FIXME: Support inflated methods, it asserts in mini_llvm_init_gshared_method_this () because the method is not in
                        // amodule->extra_methods.
                        //
                        if (direct_callable && callee_cfg->method->is_inflated)
                                direct_callable = FALSE;

                        if (direct_callable && (callee_cfg->method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) && (!method || method->wrapper_type != MONO_WRAPPER_SYNCHRONIZED))
                                // FIXME: Maybe call the wrapper directly ?
                                direct_callable = FALSE;

                        if (direct_callable && (acfg->aot_opts.soft_debug || acfg->aot_opts.no_direct_calls)) {
                                /* Disable this so all calls go through load_method (), see the
                                 * mini_get_debug_options ()->load_aot_jit_info_eagerly = TRUE; line in
                                 * mono_debugger_agent_init ().
                                 */
                                direct_callable = FALSE;
                        }

                        if (direct_callable && (callee_cfg->method->wrapper_type == MONO_WRAPPER_ALLOC))
                                /* sgen does some initialization when the allocator method is created */
                                direct_callable = FALSE;
                        if (direct_callable && (callee_cfg->method->wrapper_type == MONO_WRAPPER_WRITE_BARRIER))
                                /* we don't know at compile time whether sgen is concurrent or not */
                                direct_callable = FALSE;

                        if (direct_callable)
                                return TRUE;
                }
        } else if ((patch_info->type == MONO_PATCH_INFO_ICALL_ADDR_CALL && patch_info->data.method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL)) {
                if (acfg->aot_opts.direct_pinvoke)
                        return TRUE;
        } else if (patch_info->type == MONO_PATCH_INFO_ICALL_ADDR_CALL) {
                if (acfg->aot_opts.direct_icalls)
                        return TRUE;
                return FALSE;
        }

        return FALSE;
}

#ifdef MONO_ARCH_AOT_SUPPORTED
static const char *
get_pinvoke_import (MonoAotCompile *acfg, MonoMethod *method)
{
        MonoImage *image = m_class_get_image (method->klass);
        MonoMethodPInvoke *piinfo = (MonoMethodPInvoke *) method;
        MonoTableInfo *tables = image->tables;
        MonoTableInfo *im = &tables [MONO_TABLE_IMPLMAP];
        MonoTableInfo *mr = &tables [MONO_TABLE_MODULEREF];
        guint32 im_cols [MONO_IMPLMAP_SIZE];
        char *import;

        import = (char *)g_hash_table_lookup (acfg->method_to_pinvoke_import, method);
        if (import != NULL)
                return import;

        if (!piinfo->implmap_idx || piinfo->implmap_idx > im->rows)
                return NULL;

        mono_metadata_decode_row (im, piinfo->implmap_idx - 1, im_cols, MONO_IMPLMAP_SIZE);

        if (!im_cols [MONO_IMPLMAP_SCOPE] || im_cols [MONO_IMPLMAP_SCOPE] > mr->rows)
                return NULL;

        import = g_strdup_printf ("%s", mono_metadata_string_heap (image, im_cols [MONO_IMPLMAP_NAME]));

        g_hash_table_insert (acfg->method_to_pinvoke_import, method, import);
        
        return import;
}
#else
static const char *
get_pinvoke_import (MonoAotCompile *acfg, MonoMethod *method)
{
        return NULL;
}
#endif

static gint
compare_lne (MonoDebugLineNumberEntry *a, MonoDebugLineNumberEntry *b)
{
        if (a->native_offset == b->native_offset)
                return a->il_offset - b->il_offset;
        else
                return a->native_offset - b->native_offset;
}

/*
 * compute_line_numbers:
 *
 * Returns a sparse array of size CODE_SIZE containing MonoDebugSourceLocation* entries for the native offsets which have a corresponding line number
 * entry.
 */
static MonoDebugSourceLocation**
compute_line_numbers (MonoMethod *method, int code_size, MonoDebugMethodJitInfo *debug_info)
{
        MonoDebugMethodInfo *minfo;
        MonoDebugLineNumberEntry *ln_array;
        MonoDebugSourceLocation *loc;
        int i, prev_line, prev_il_offset;
        int *native_to_il_offset = NULL;
        MonoDebugSourceLocation **res;
        gboolean first;

        minfo = mono_debug_lookup_method (method);
        if (!minfo)
                return NULL;
        // FIXME: This seems to happen when two methods have the same cfg->method_to_register
        if (debug_info->code_size != code_size)
                return NULL;

        g_assert (code_size);

        /* Compute the native->IL offset mapping */

        ln_array = g_new0 (MonoDebugLineNumberEntry, debug_info->num_line_numbers);
        memcpy (ln_array, debug_info->line_numbers, debug_info->num_line_numbers * sizeof (MonoDebugLineNumberEntry));

        mono_qsort (ln_array, debug_info->num_line_numbers, sizeof (MonoDebugLineNumberEntry), (int (*)(const void *, const void *))compare_lne);

        native_to_il_offset = g_new0 (int, code_size + 1);

        for (i = 0; i < debug_info->num_line_numbers; ++i) {
                int j;
                MonoDebugLineNumberEntry *lne = &ln_array [i];

                if (i == 0) {
                        for (j = 0; j < lne->native_offset; ++j)
                                native_to_il_offset [j] = -1;
                }

                if (i < debug_info->num_line_numbers - 1) {
                        MonoDebugLineNumberEntry *lne_next = &ln_array [i + 1];

                        for (j = lne->native_offset; j < lne_next->native_offset; ++j)
                                native_to_il_offset [j] = lne->il_offset;
                } else {
                        for (j = lne->native_offset; j < code_size; ++j)
                                native_to_il_offset [j] = lne->il_offset;
                }
        }
        g_free (ln_array);

        /* Compute the native->line number mapping */
        res = g_new0 (MonoDebugSourceLocation*, code_size);
        prev_il_offset = -1;
        prev_line = -1;
        first = TRUE;
        for (i = 0; i < code_size; ++i) {
                int il_offset = native_to_il_offset [i];

                if (il_offset == -1 || il_offset == prev_il_offset)
                        continue;
                prev_il_offset = il_offset;
                loc = mono_debug_method_lookup_location (minfo, il_offset);
                if (!(loc && loc->source_file))
                        continue;
                if (loc->row == prev_line) {
                        mono_debug_free_source_location (loc);
                        continue;
                }
                prev_line = loc->row;
                //printf ("D: %s:%d il=%x native=%x\n", loc->source_file, loc->row, il_offset, i);
                if (first)
                        /* This will cover the prolog too */
                        res [0] = loc;
                else
                        res [i] = loc;
                first = FALSE;
        }
        return res;
}

static int
get_file_index (MonoAotCompile *acfg, const char *source_file)
{
        int findex;

        // FIXME: Free these
        if (!acfg->dwarf_ln_filenames)
                acfg->dwarf_ln_filenames = g_hash_table_new (g_str_hash, g_str_equal);
        findex = GPOINTER_TO_INT (g_hash_table_lookup (acfg->dwarf_ln_filenames, source_file));
        if (!findex) {
                findex = g_hash_table_size (acfg->dwarf_ln_filenames) + 1;
                g_hash_table_insert (acfg->dwarf_ln_filenames, g_strdup (source_file), GINT_TO_POINTER (findex));
                emit_unset_mode (acfg);
                fprintf (acfg->fp, ".file %d \"%s\"\n", findex, mono_dwarf_escape_path (source_file));
        }
        return findex;
}

#ifdef TARGET_ARM64
#define INST_LEN 4
#else
#define INST_LEN 1
#endif

/*
 * emit_and_reloc_code:
 *
 *   Emit the native code in CODE, handling relocations along the way. If GOT_ONLY
 * is true, calls are made through the GOT too. This is used for emitting trampolines
 * in full-aot mode, since calls made from trampolines couldn't go through the PLT,
 * since trampolines are needed to make PLT work.
 */
static void
emit_and_reloc_code (MonoAotCompile *acfg, MonoMethod *method, guint8 *code, guint32 code_len, MonoJumpInfo *relocs, gboolean got_only, MonoDebugMethodJitInfo *debug_info)
{
        int i, pindex, start_index;
        GPtrArray *patches;
        MonoJumpInfo *patch_info;
        MonoDebugSourceLocation **locs = NULL;
        gboolean skip, prologue_end = FALSE;
#ifdef MONO_ARCH_AOT_SUPPORTED
        gboolean direct_call, external_call;
        guint32 got_slot;
        const char *direct_call_target = 0;
        const char *direct_pinvoke;
#endif

        if (acfg->gas_line_numbers && method && debug_info) {
                locs = compute_line_numbers (method, code_len, debug_info);
                if (!locs) {
                        int findex = get_file_index (acfg, "<unknown>");
                        emit_unset_mode (acfg);
                        fprintf (acfg->fp, ".loc %d %d 0\n", findex, 1);
                }
        }

        /* Collect and sort relocations */
        patches = g_ptr_array_new ();
        for (patch_info = relocs; patch_info; patch_info = patch_info->next)
                g_ptr_array_add (patches, patch_info);
        g_ptr_array_sort (patches, compare_patches);

        start_index = 0;
        for (i = 0; i < code_len; i += INST_LEN) {
                patch_info = NULL;
                for (pindex = start_index; pindex < patches->len; ++pindex) {
                        patch_info = (MonoJumpInfo *)g_ptr_array_index (patches, pindex);
                        if (patch_info->ip.i >= i)
                                break;
                }

                if (locs && locs [i]) {
                        MonoDebugSourceLocation *loc = locs [i];
                        int findex;
                        const char *options;

                        findex = get_file_index (acfg, loc->source_file);
                        emit_unset_mode (acfg);
                        if (!prologue_end)
                                options = " prologue_end";
                        else
                                options = "";
                        prologue_end = TRUE;
                        fprintf (acfg->fp, ".loc %d %d 0%s\n", findex, loc->row, options);
                        mono_debug_free_source_location (loc);
                }

                skip = FALSE;
#ifdef MONO_ARCH_AOT_SUPPORTED
                if (patch_info && (patch_info->ip.i == i) && (pindex < patches->len)) {
                        start_index = pindex;

                        switch (patch_info->type) {
                        case MONO_PATCH_INFO_NONE:
                                break;
                        case MONO_PATCH_INFO_GOT_OFFSET: {
                                int code_size;
 
                                arch_emit_got_offset (acfg, code + i, &code_size);
                                i += code_size - INST_LEN;
                                skip = TRUE;
                                patch_info->type = MONO_PATCH_INFO_NONE;
                                break;
                        }
                        case MONO_PATCH_INFO_OBJC_SELECTOR_REF: {
                                int code_size, index;
                                char *selector = (char *)patch_info->data.target;

                                if (!acfg->objc_selector_to_index)
                                        acfg->objc_selector_to_index = g_hash_table_new (g_str_hash, g_str_equal);
                                if (!acfg->objc_selectors)
                                        acfg->objc_selectors = g_ptr_array_new ();
                                index = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->objc_selector_to_index, selector));
                                if (index)
                                        index --;
                                else {
                                        index = acfg->objc_selector_index;
                                        g_ptr_array_add (acfg->objc_selectors, (void*)patch_info->data.target);
                                        g_hash_table_insert (acfg->objc_selector_to_index, selector, GUINT_TO_POINTER (index + 1));
                                        acfg->objc_selector_index ++;
                                }

                                arch_emit_objc_selector_ref (acfg, code + i, index, &code_size);
                                i += code_size - INST_LEN;
                                skip = TRUE;
                                patch_info->type = MONO_PATCH_INFO_NONE;
                                break;
                        }
                        default: {
                                /*
                                 * If this patch is a call, try emitting a direct call instead of
                                 * through a PLT entry. This is possible if the called method is in
                                 * the same assembly and requires no initialization.
                                 */
                                direct_call = FALSE;
                                external_call = FALSE;
                                if ((patch_info->type == MONO_PATCH_INFO_METHOD) && (m_class_get_image (patch_info->data.method->klass) == acfg->image)) {
                                        if (!got_only && is_direct_callable (acfg, method, patch_info)) {
                                                MonoCompile *callee_cfg = (MonoCompile *)g_hash_table_lookup (acfg->method_to_cfg, patch_info->data.method);

                                                // Don't compile inflated methods if we're doing dedup
                                                if (acfg->aot_opts.dedup && !mono_aot_can_dedup (patch_info->data.method)) {
                                                        char *name = mono_aot_get_mangled_method_name (patch_info->data.method);
                                                        mono_trace (G_LOG_LEVEL_DEBUG, MONO_TRACE_AOT, "DIRECT CALL: %s by %s", name, method ? mono_method_full_name (method, TRUE) : "");
                                                        g_free (name);

                                                        direct_call = TRUE;
                                                        direct_call_target = callee_cfg->asm_symbol;
                                                        patch_info->type = MONO_PATCH_INFO_NONE;
                                                        acfg->stats.direct_calls ++;
                                                }
                                        }

                                        acfg->stats.all_calls ++;
                                } else if (patch_info->type == MONO_PATCH_INFO_ICALL_ADDR_CALL) {
                                        if (!got_only && is_direct_callable (acfg, method, patch_info)) {
                                                if (!(patch_info->data.method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
                                                        direct_pinvoke = lookup_icall_symbol_name_aot (patch_info->data.method);
                                                else
                                                        direct_pinvoke = get_pinvoke_import (acfg, patch_info->data.method);
                                                if (direct_pinvoke) {
                                                        direct_call = TRUE;
                                                        g_assert (strlen (direct_pinvoke) < 1000);
                                                        direct_call_target = g_strdup_printf ("%s%s", acfg->user_symbol_prefix, direct_pinvoke);
                                                }
                                        }
                                } else if (patch_info->type == MONO_PATCH_INFO_JIT_ICALL_ADDR) {
                                        const char *sym = mono_find_jit_icall_info (patch_info->data.jit_icall_id)->c_symbol;
                                        if (!got_only && sym && acfg->aot_opts.direct_icalls) {
                                                /* Call to a C function implementing a jit icall */
                                                direct_call = TRUE;
                                                external_call = TRUE;
                                                g_assert (strlen (sym) < 1000);
                                                direct_call_target = g_strdup_printf ("%s%s", acfg->user_symbol_prefix, sym);
                                        }
                                } else if (patch_info->type == MONO_PATCH_INFO_JIT_ICALL_ID) {
                                        MonoJitICallInfo * const info = mono_find_jit_icall_info (patch_info->data.jit_icall_id);
                                        const char * const sym = info->c_symbol;
                                        if (!got_only && sym && acfg->aot_opts.direct_icalls && info->func == info->wrapper) {
                                                /* Call to a jit icall without a wrapper */
                                                direct_call = TRUE;
                                                external_call = TRUE;
                                                g_assert (strlen (sym) < 1000);
                                                direct_call_target = g_strdup_printf ("%s%s", acfg->user_symbol_prefix, sym);
                                        }
                                }
                                if (direct_call) {
                                        patch_info->type = MONO_PATCH_INFO_NONE;
                                        acfg->stats.direct_calls ++;
                                }

                                if (!got_only && !direct_call) {
                                        MonoPltEntry *plt_entry = get_plt_entry (acfg, patch_info);
                                        if (plt_entry) {
                                                /* This patch has a PLT entry, so we must emit a call to the PLT entry */
                                                direct_call = TRUE;
                                                direct_call_target = plt_entry->symbol;
                
                                                /* Nullify the patch */
                                                patch_info->type = MONO_PATCH_INFO_NONE;
                                                plt_entry->jit_used = TRUE;
                                        }
                                }

                                if (direct_call) {
                                        int call_size;

                                        arch_emit_direct_call (acfg, direct_call_target, external_call, FALSE, patch_info, &call_size);
                                        i += call_size - INST_LEN;
                                } else {
                                        int code_size;

                                        got_slot = get_got_offset (acfg, FALSE, patch_info);

                                        arch_emit_got_access (acfg, acfg->got_symbol, code + i, got_slot, &code_size);
                                        i += code_size - INST_LEN;
                                }
                                skip = TRUE;
                        }
                        }
                }
#endif /* MONO_ARCH_AOT_SUPPORTED */

                if (!skip) {
                        /* Find next patch */
                        patch_info = NULL;
                        for (pindex = start_index; pindex < patches->len; ++pindex) {
                                patch_info = (MonoJumpInfo *)g_ptr_array_index (patches, pindex);
                                if (patch_info->ip.i >= i)
                                        break;
                        }

                        /* Try to emit multiple bytes at once */
                        if (pindex < patches->len && patch_info->ip.i > i) {
                                int limit;

                                for (limit = i + INST_LEN; limit < patch_info->ip.i; limit += INST_LEN) {
                                        if (locs && locs [limit])
                                                break;
                                }

                                emit_code_bytes (acfg, code + i, limit - i);
                                i = limit - INST_LEN;
                        } else {
                                emit_code_bytes (acfg, code + i, INST_LEN);
                        }
                }
        }

        g_ptr_array_free (patches, TRUE);
        g_free (locs);
}

/*
 * sanitize_symbol:
 *
 *   Return a modified version of S which only includes characters permissible in symbols.
 */
static char*
sanitize_symbol (MonoAotCompile *acfg, char *s)
{
        gboolean process = FALSE;
        int i, len;
        GString *gs;
        char *res;

        if (!s)
                return s;

        len = strlen (s);
        for (i = 0; i < len; ++i)
                if (!(s [i] <= 0x7f && (isalnum (s [i]) || s [i] == '_')))
                        process = TRUE;
        if (!process)
                return s;

        gs = g_string_sized_new (len);
        for (i = 0; i < len; ++i) {
                guint8 c = s [i];
                if (c <= 0x7f && (isalnum (c) || c == '_')) {
                        g_string_append_c (gs, c);
                } else if (c > 0x7f) {
                        /* multi-byte utf8 */
                        g_string_append_printf (gs, "_0x%x", c);
                        i ++;
                        c = s [i];
                        while (c >> 6 == 0x2) {
                                g_string_append_printf (gs, "%x", c);
                                i ++;
                                c = s [i];
                        }
                        g_string_append_printf (gs, "_");
                        i --;
                } else {
                        g_string_append_c (gs, '_');
                }
        }

        res = mono_mempool_strdup (acfg->mempool, gs->str);
        g_string_free (gs, TRUE);
        return res;
}

static char*
get_debug_sym (MonoMethod *method, const char *prefix, GHashTable *cache)
{
        char *name1, *name2, *cached;
        int i, j, len, count;
        MonoMethod *cached_method;

        name1 = mono_method_full_name (method, TRUE);

#ifdef TARGET_MACH
        // This is so that we don't accidentally create a local symbol (which starts with 'L')
        if ((!prefix || !*prefix) && name1 [0] == 'L')
                prefix = "_";
#endif

#if defined(TARGET_WIN32) && defined(TARGET_X86)
        char adjustedPrefix [MAX_SYMBOL_SIZE];
        prefix = mangle_symbol (prefix, adjustedPrefix, G_N_ELEMENTS (adjustedPrefix));
#endif

        len = strlen (name1);
        name2 = (char *) g_malloc (strlen (prefix) + len + 16);
        memcpy (name2, prefix, strlen (prefix));
        j = strlen (prefix);
        for (i = 0; i < len; ++i) {
                if (i == 0 && name1 [0] >= '0' && name1 [0] <= '9') {
                        name2 [j ++] = '_';
                } else if (isalnum (name1 [i])) {
                        name2 [j ++] = name1 [i];
                } else if (name1 [i] == ' ' && name1 [i + 1] == '(' && name1 [i + 2] == ')') {
                        i += 2;
                } else if (name1 [i] == ',' && name1 [i + 1] == ' ') {
                        name2 [j ++] = '_';
                        i++;
                } else if (name1 [i] == '(' || name1 [i] == ')' || name1 [i] == '>') {
                } else
                        name2 [j ++] = '_';
        }
        name2 [j] = '\0';

        g_free (name1);

        count = 0;
        while (TRUE) {
                cached_method = (MonoMethod *)g_hash_table_lookup (cache, name2);
                if (!(cached_method && cached_method != method))
                        break;
                sprintf (name2 + j, "_%d", count);
                count ++;
        }

        cached = g_strdup (name2);
        g_hash_table_insert (cache, cached, method);

        return name2;
}

static void
emit_method_code (MonoAotCompile *acfg, MonoCompile *cfg)
{
        MonoMethod *method;
        int method_index;
        guint8 *code;
        char *debug_sym = NULL;
        char *symbol = NULL;
        int func_alignment = AOT_FUNC_ALIGNMENT;
        char *export_name;

        g_assert (!ignore_cfg (cfg));

        method = cfg->orig_method;
        code = cfg->native_code;

        method_index = get_method_index (acfg, method);
        symbol = g_strdup_printf ("%sme_%x", acfg->temp_prefix, method_index);

        /* Make the labels local */
        emit_section_change (acfg, ".text", 0);
        emit_alignment_code (acfg, func_alignment);
        
        if (acfg->global_symbols && acfg->need_no_dead_strip)
                fprintf (acfg->fp, "    .no_dead_strip %s\n", cfg->asm_symbol);
        
        emit_label (acfg, cfg->asm_symbol);

        if (acfg->aot_opts.write_symbols && !acfg->global_symbols && !acfg->llvm) {
                /* 
                 * Write a C style symbol for every method, this has two uses:
                 * - it works on platforms where the dwarf debugging info is not
                 *   yet supported.
                 * - it allows the setting of breakpoints of aot-ed methods.
                 */

                // Comment out to force dedup to link these symbols and forbid compiling
                // in duplicated code. This is an "assert when linking if broken" trick.
                /*if (mono_aot_can_dedup (method) && (acfg->aot_opts.dedup || acfg->aot_opts.dedup_include))*/
                        /*debug_sym = mono_aot_get_mangled_method_name (method);*/
                /*else*/
                        debug_sym = get_debug_sym (method, "", acfg->method_label_hash);

                cfg->asm_debug_symbol = g_strdup (debug_sym);

                if (acfg->need_no_dead_strip)
                        fprintf (acfg->fp, "    .no_dead_strip %s\n", debug_sym);

                // Comment out to force dedup to link these symbols and forbid compiling
                // in duplicated code. This is an "assert when linking if broken" trick.
                /*if (mono_aot_can_dedup (method) && (acfg->aot_opts.dedup || acfg->aot_opts.dedup_include))*/
                        /*emit_global_inner (acfg, debug_sym, TRUE);*/
                /*else*/
                        emit_local_symbol (acfg, debug_sym, symbol, TRUE);

                emit_label (acfg, debug_sym);
        }

        export_name = (char *)g_hash_table_lookup (acfg->export_names, method);
        if (export_name) {
                /* Emit a global symbol for the method */
                emit_global_inner (acfg, export_name, TRUE);
                emit_label (acfg, export_name);
        }

        if (cfg->verbose_level > 0 && !ignore_cfg (cfg))
                g_print ("Method %s emitted as %s\n", mono_method_get_full_name (method), cfg->asm_symbol);

        acfg->stats.code_size += cfg->code_len;

        acfg->cfgs [method_index]->got_offset = acfg->got_offset;

        emit_and_reloc_code (acfg, method, code, cfg->code_len, cfg->patch_info, FALSE, mono_debug_find_method (cfg->jit_info->d.method, mono_domain_get ()));

        emit_line (acfg);

        if (acfg->aot_opts.write_symbols) {
                if (debug_sym)
                        emit_symbol_size (acfg, debug_sym, ".");
                else
                        emit_symbol_size (acfg, cfg->asm_symbol, ".");
                g_free (debug_sym);
        }

        emit_label (acfg, symbol);

        arch_emit_unwind_info_sections (acfg, cfg->asm_symbol, symbol, cfg->unwind_ops);

        g_free (symbol);
}

/**
 * encode_patch:
 *
 *  Encode PATCH_INFO into its disk representation.
 */
static void
encode_patch (MonoAotCompile *acfg, MonoJumpInfo *patch_info, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;

        switch (patch_info->type) {
        case MONO_PATCH_INFO_NONE:
                break;
        case MONO_PATCH_INFO_IMAGE:
                encode_value (get_image_index (acfg, patch_info->data.image), p, &p);
                break;
        case MONO_PATCH_INFO_MSCORLIB_GOT_ADDR:
        case MONO_PATCH_INFO_GC_CARD_TABLE_ADDR:
        case MONO_PATCH_INFO_GC_NURSERY_START:
        case MONO_PATCH_INFO_GC_NURSERY_BITS:
                break;
        case MONO_PATCH_INFO_SWITCH: {
                gpointer *table = (gpointer *)patch_info->data.table->table;
                int k;

                encode_value (patch_info->data.table->table_size, p, &p);
                for (k = 0; k < patch_info->data.table->table_size; k++)
                        encode_value ((int)(gssize)table [k], p, &p);
                break;
        }
        case MONO_PATCH_INFO_METHODCONST:
        case MONO_PATCH_INFO_METHOD:
        case MONO_PATCH_INFO_METHOD_JUMP:
        case MONO_PATCH_INFO_METHOD_FTNDESC:
        case MONO_PATCH_INFO_ICALL_ADDR:
        case MONO_PATCH_INFO_ICALL_ADDR_CALL:
        case MONO_PATCH_INFO_METHOD_RGCTX:
        case MONO_PATCH_INFO_METHOD_CODE_SLOT:
                encode_method_ref (acfg, patch_info->data.method, p, &p);
                break;
        case MONO_PATCH_INFO_AOT_JIT_INFO:
        case MONO_PATCH_INFO_CASTCLASS_CACHE:
                encode_value (patch_info->data.index, p, &p);
                break;
        case MONO_PATCH_INFO_JIT_ICALL_ID:
        case MONO_PATCH_INFO_JIT_ICALL_ADDR:
        case MONO_PATCH_INFO_JIT_ICALL_ADDR_NOCALL:
                encode_value (patch_info->data.jit_icall_id, p, &p);
                break;
        case MONO_PATCH_INFO_SPECIFIC_TRAMPOLINE_LAZY_FETCH_ADDR:
                encode_value (patch_info->data.uindex, p, &p);
                break;
        case MONO_PATCH_INFO_LDSTR_LIT: {
                guint32 len = strlen (patch_info->data.name);
                encode_value (len, p, &p);
                memcpy (p, patch_info->data.name, len + 1);
                p += len + 1;
                break;
        }
        case MONO_PATCH_INFO_LDSTR: {
                guint32 image_index = get_image_index (acfg, patch_info->data.token->image);
                guint32 token = patch_info->data.token->token;
                g_assert (mono_metadata_token_code (token) == MONO_TOKEN_STRING);
                encode_value (image_index, p, &p);
                encode_value (patch_info->data.token->token - MONO_TOKEN_STRING, p, &p);
                break;
        }
        case MONO_PATCH_INFO_RVA:
        case MONO_PATCH_INFO_DECLSEC:
        case MONO_PATCH_INFO_LDTOKEN:
        case MONO_PATCH_INFO_TYPE_FROM_HANDLE:
                encode_value (get_image_index (acfg, patch_info->data.token->image), p, &p);
                encode_value (patch_info->data.token->token, p, &p);
                encode_value (patch_info->data.token->has_context, p, &p);
                if (patch_info->data.token->has_context)
                        encode_generic_context (acfg, &patch_info->data.token->context, p, &p);
                break;
        case MONO_PATCH_INFO_EXC_NAME: {
                MonoClass *ex_class;

                ex_class =
                        mono_class_load_from_name (m_class_get_image (mono_defaults.exception_class),
                                                                  "System", (const char *)patch_info->data.target);
                encode_klass_ref (acfg, ex_class, p, &p);
                break;
        }
        case MONO_PATCH_INFO_R4:
                encode_value (*((guint32 *)patch_info->data.target), p, &p);
                break;
        case MONO_PATCH_INFO_R8:
                encode_value (((guint32 *)patch_info->data.target) [MINI_LS_WORD_IDX], p, &p);
                encode_value (((guint32 *)patch_info->data.target) [MINI_MS_WORD_IDX], p, &p);
                break;
        case MONO_PATCH_INFO_VTABLE:
        case MONO_PATCH_INFO_CLASS:
        case MONO_PATCH_INFO_IID:
        case MONO_PATCH_INFO_ADJUSTED_IID:
                encode_klass_ref (acfg, patch_info->data.klass, p, &p);
                break;
        case MONO_PATCH_INFO_DELEGATE_TRAMPOLINE:
                encode_klass_ref (acfg, patch_info->data.del_tramp->klass, p, &p);
                if (patch_info->data.del_tramp->method) {
                        encode_value (1, p, &p);
                        encode_method_ref (acfg, patch_info->data.del_tramp->method, p, &p);
                } else {
                        encode_value (0, p, &p);
                }
                encode_value (patch_info->data.del_tramp->is_virtual, p, &p);
                break;
        case MONO_PATCH_INFO_FIELD:
        case MONO_PATCH_INFO_SFLDA:
                encode_field_info (acfg, patch_info->data.field, p, &p);
                break;
        case MONO_PATCH_INFO_INTERRUPTION_REQUEST_FLAG:
                break;
        case MONO_PATCH_INFO_PROFILER_ALLOCATION_COUNT:
        case MONO_PATCH_INFO_PROFILER_CLAUSE_COUNT:
                break;
        case MONO_PATCH_INFO_RGCTX_FETCH:
        case MONO_PATCH_INFO_RGCTX_SLOT_INDEX: {
                MonoJumpInfoRgctxEntry *entry = patch_info->data.rgctx_entry;
                guint32 offset;

                /* 
                 * entry->d.klass/method has a lenghtly encoding and multiple rgctx_fetch entries
                 * reference the same klass/method, so encode it only once.
                 * For patches which refer to got entries, this sharing is done by get_got_offset, but
                 * these are not got entries.
                 */
                if (entry->in_mrgctx) {
                        offset = get_shared_method_ref (acfg, entry->d.method);
                } else {
                        offset = get_shared_klass_ref (acfg, entry->d.klass);
                }

                encode_value (offset, p, &p);
                g_assert ((int)entry->info_type < 256);
                g_assert (entry->data->type < 256);
                encode_value ((entry->in_mrgctx ? 1 : 0) | (entry->info_type << 1) | (entry->data->type << 9), p, &p);
                encode_patch (acfg, entry->data, p, &p);
                break;
        }
        case MONO_PATCH_INFO_SEQ_POINT_INFO:
        case MONO_PATCH_INFO_AOT_MODULE:
                break;
        case MONO_PATCH_INFO_SIGNATURE:
        case MONO_PATCH_INFO_GSHAREDVT_IN_WRAPPER:
                encode_signature (acfg, (MonoMethodSignature*)patch_info->data.target, p, &p);
                break;
        case MONO_PATCH_INFO_GSHAREDVT_CALL:
                encode_signature (acfg, (MonoMethodSignature*)patch_info->data.gsharedvt->sig, p, &p);
                encode_method_ref (acfg, patch_info->data.gsharedvt->method, p, &p);
                break;
        case MONO_PATCH_INFO_GSHAREDVT_METHOD: {
                MonoGSharedVtMethodInfo *info = patch_info->data.gsharedvt_method;
                int i;

                encode_method_ref (acfg, info->method, p, &p);
                encode_value (info->num_entries, p, &p);
                for (i = 0; i < info->num_entries; ++i) {
                        MonoRuntimeGenericContextInfoTemplate *template_ = &info->entries [i];

                        encode_value (template_->info_type, p, &p);
                        switch (mini_rgctx_info_type_to_patch_info_type (template_->info_type)) {
                        case MONO_PATCH_INFO_CLASS:
                                encode_klass_ref (acfg, mono_class_from_mono_type_internal ((MonoType *)template_->data), p, &p);
                                break;
                        case MONO_PATCH_INFO_FIELD:
                                encode_field_info (acfg, (MonoClassField *)template_->data, p, &p);
                                break;
                        default:
                                g_assert_not_reached ();
                                break;
                        }
                }
                break;
        }
        case MONO_PATCH_INFO_VIRT_METHOD:
                encode_klass_ref (acfg, patch_info->data.virt_method->klass, p, &p);
                encode_method_ref (acfg, patch_info->data.virt_method->method, p, &p);
                break;
        case MONO_PATCH_INFO_GC_SAFE_POINT_FLAG:
                break;
        default:
                g_error ("unable to handle jump info %d", patch_info->type);
        }

        *endbuf = p;
}

static void
encode_patch_list (MonoAotCompile *acfg, GPtrArray *patches, int n_patches, gboolean llvm, guint8 *buf, guint8 **endbuf)
{
        guint8 *p = buf;
        guint32 pindex, offset;
        MonoJumpInfo *patch_info;

        encode_value (n_patches, p, &p);

        for (pindex = 0; pindex < patches->len; ++pindex) {
                patch_info = (MonoJumpInfo *)g_ptr_array_index (patches, pindex);

                if (patch_info->type == MONO_PATCH_INFO_NONE || patch_info->type == MONO_PATCH_INFO_BB)
                        /* Nothing to do */
                        continue;
                /* This shouldn't allocate a new offset */
                offset = lookup_got_offset (acfg, llvm, patch_info);
                encode_value (offset, p, &p);
        }

        *endbuf = p;
}

static void
emit_method_info (MonoAotCompile *acfg, MonoCompile *cfg)
{
        MonoMethod *method;
        int pindex, buf_size, n_patches;
        GPtrArray *patches;
        MonoJumpInfo *patch_info;
        guint8 *p, *buf;
        guint32 offset;
        gboolean needs_ctx = FALSE;

        method = cfg->orig_method;

        (void)get_method_index (acfg, method);

        /* Sort relocations */
        patches = g_ptr_array_new ();
        for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next)
                g_ptr_array_add (patches, patch_info);
        if (!acfg->aot_opts.llvm_only)
                g_ptr_array_sort (patches, compare_patches);

        /**********************/
        /* Encode method info */
        /**********************/

        g_assert (!(cfg->opt & MONO_OPT_SHARED));

        guint32 *got_offsets = g_new0 (guint32, patches->len);

        n_patches = 0;
        for (pindex = 0; pindex < patches->len; ++pindex) {
                patch_info = (MonoJumpInfo *)g_ptr_array_index (patches, pindex);
                
                if ((patch_info->type == MONO_PATCH_INFO_GOT_OFFSET) ||
                        (patch_info->type == MONO_PATCH_INFO_NONE)) {
                        patch_info->type = MONO_PATCH_INFO_NONE;
                        /* Nothing to do */
                        continue;
                }

                if ((patch_info->type == MONO_PATCH_INFO_IMAGE) && (patch_info->data.image == acfg->image)) {
                        /* Stored in a GOT slot initialized at module load time */
                        patch_info->type = MONO_PATCH_INFO_NONE;
                        continue;
                }

                if (patch_info->type == MONO_PATCH_INFO_GC_CARD_TABLE_ADDR ||
                        patch_info->type == MONO_PATCH_INFO_GC_NURSERY_START ||
                        patch_info->type == MONO_PATCH_INFO_GC_NURSERY_BITS ||
                        patch_info->type == MONO_PATCH_INFO_AOT_MODULE) {
                        /* Stored in a GOT slot initialized at module load time */
                        patch_info->type = MONO_PATCH_INFO_NONE;
                        continue;
                }

                if (is_plt_patch (patch_info) && !(cfg->compile_llvm && acfg->aot_opts.llvm_only)) {
                        /* Calls are made through the PLT */
                        patch_info->type = MONO_PATCH_INFO_NONE;
                        continue;
                }

                if (acfg->aot_opts.llvm_only && patch_info->type == MONO_PATCH_INFO_METHOD)
                        needs_ctx = TRUE;

                /* This shouldn't allocate a new offset */
                offset = lookup_got_offset (acfg, cfg->compile_llvm, patch_info);
                if (offset >= acfg->nshared_got_entries)
                        got_offsets [n_patches ++] = offset;
        }

        if (n_patches)
                g_assert (cfg->has_got_slots);

        buf_size = (patches->len < 1000) ? 40960 : 40960 + (patches->len * 64);
        p = buf = (guint8 *)g_malloc (buf_size);

        MonoGenericContext *ctx = mono_method_get_context (cfg->method);

        guint8 flags = 0;
        if (mono_class_get_cctor (method->klass))
                flags |= MONO_AOT_METHOD_FLAG_HAS_CCTOR;
        if (mini_jit_info_is_gsharedvt (cfg->jit_info) && mini_is_gsharedvt_variable_signature (mono_method_signature_internal (jinfo_get_method (cfg->jit_info))))
                flags |= MONO_AOT_METHOD_FLAG_GSHAREDVT_VARIABLE;
        if (n_patches)
                flags |= MONO_AOT_METHOD_FLAG_HAS_PATCHES;
        if (needs_ctx && ctx)
                flags |= MONO_AOT_METHOD_FLAG_HAS_CTX;
        encode_value (flags, p, &p);
        if (flags & MONO_AOT_METHOD_FLAG_HAS_CCTOR)
                encode_klass_ref (acfg, method->klass, p, &p);
        if (needs_ctx && ctx)
                encode_generic_context (acfg, ctx, p, &p);

        if (n_patches) {
                encode_value (n_patches, p, &p);
                for (int i = 0; i < n_patches; ++i)
                        encode_value (got_offsets [i], p, &p);
        }

        g_ptr_array_free (patches, TRUE);
        g_free (got_offsets);

        acfg->stats.method_info_size += p - buf;

        g_assert (p - buf < buf_size);

        cfg->method_info_offset = add_to_blob (acfg, buf, p - buf);
        g_free (buf);
}

static guint32
get_unwind_info_offset (MonoAotCompile *acfg, guint8 *encoded, guint32 encoded_len)
{
        guint32 cache_index;
        guint32 offset;

        /* Reuse the unwind module to canonize and store unwind info entries */
        cache_index = mono_cache_unwind_info (encoded, encoded_len);

        /* Use +/- 1 to distinguish 0s from missing entries */
        offset = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->unwind_info_offsets, GUINT_TO_POINTER (cache_index + 1)));
        if (offset)
                return offset - 1;
        else {
                guint8 buf [16];
                guint8 *p;

                /* 
                 * It would be easier to use assembler symbols, but the caller needs an
                 * offset now.
                 */
                offset = acfg->unwind_info_offset;
                g_hash_table_insert (acfg->unwind_info_offsets, GUINT_TO_POINTER (cache_index + 1), GUINT_TO_POINTER (offset + 1));
                g_ptr_array_add (acfg->unwind_ops, GUINT_TO_POINTER (cache_index));

                p = buf;
                encode_value (encoded_len, p, &p);

                acfg->unwind_info_offset += encoded_len + (p - buf);
                return offset;
        }
}

static void
emit_exception_debug_info (MonoAotCompile *acfg, MonoCompile *cfg, gboolean store_seq_points)
{
        int i, k, buf_size;
        guint32 debug_info_size, seq_points_size;
        guint8 *code;
        MonoMethodHeader *header;
        guint8 *p, *buf, *debug_info;
        MonoJitInfo *jinfo = cfg->jit_info;
        guint32 flags;
        gboolean use_unwind_ops = FALSE;
        MonoSeqPointInfo *seq_points;

        code = cfg->native_code;
        header = cfg->header;

        if (!acfg->aot_opts.nodebug) {
                mono_debug_serialize_debug_info (cfg, &debug_info, &debug_info_size);
        } else {
                debug_info = NULL;
                debug_info_size = 0;
        }

        seq_points = cfg->seq_point_info;
        seq_points_size = (store_seq_points)? mono_seq_point_info_get_write_size (seq_points) : 0;

        buf_size = header->num_clauses * 256 + debug_info_size + 2048 + seq_points_size + cfg->gc_map_size;
        if (jinfo->has_try_block_holes) {
                MonoTryBlockHoleTableJitInfo *table = mono_jit_info_get_try_block_hole_table_info (jinfo);
                buf_size += table->num_holes * 16;
        }

        p = buf = (guint8 *)g_malloc (buf_size);

        use_unwind_ops = cfg->unwind_ops != NULL;

        flags = (jinfo->has_generic_jit_info ? 1 : 0) | (use_unwind_ops ? 2 : 0) | (header->num_clauses ? 4 : 0) | (seq_points_size ? 8 : 0) | (cfg->compile_llvm ? 16 : 0) | (jinfo->has_try_block_holes ? 32 : 0) | (cfg->gc_map ? 64 : 0) | (jinfo->has_arch_eh_info ? 128 : 0);

        encode_value (flags, p, &p);

        if (use_unwind_ops) {
                guint32 encoded_len;
                guint8 *encoded;
                guint32 unwind_desc;

                encoded = mono_unwind_ops_encode (cfg->unwind_ops, &encoded_len);

                unwind_desc = get_unwind_info_offset (acfg, encoded, encoded_len);
                encode_value (unwind_desc, p, &p);

                g_free (encoded);
        } else {
                encode_value (jinfo->unwind_info, p, &p);
        }

        /*Encode the number of holes before the number of clauses to make decoding easier*/
        if (jinfo->has_try_block_holes) {
                MonoTryBlockHoleTableJitInfo *table = mono_jit_info_get_try_block_hole_table_info (jinfo);
                encode_value (table->num_holes, p, &p);
        }

        if (jinfo->has_arch_eh_info) {
                /*
                 * In AOT mode, the code length is calculated from the address of the previous method,
                 * which could include alignment padding, so calculating the start of the epilog as
                 * code_len - epilog_size is correct any more. Save the real code len as a workaround.
                 */
                encode_value (jinfo->code_size, p, &p);
        }

        /* Exception table */
        if (cfg->compile_llvm) {
                /*
                 * When using LLVM, we can't emit some data, like pc offsets, this reg/offset etc.,
                 * since the information is only available to llc. Instead, we let llc save the data
                 * into the LSDA, and read it from there at runtime.
                 */
                /* The assembly might be CIL stripped so emit the data ourselves */
                if (header->num_clauses)
                        encode_value (header->num_clauses, p, &p);

                for (k = 0; k < header->num_clauses; ++k) {
                        MonoExceptionClause *clause;

                        clause = &header->clauses [k];

                        encode_value (clause->flags, p, &p);
                        if (!(clause->flags == MONO_EXCEPTION_CLAUSE_FILTER || clause->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
                                if (clause->data.catch_class) {
                                        guint8 *buf2, *p2;
                                        int len;

                                        buf2 = (guint8 *)g_malloc (4096);
                                        p2 = buf2;
                                        encode_klass_ref (acfg, clause->data.catch_class, p2, &p2);
                                        len = p2 - buf2;
                                        g_assert (len < 4096);
                                        encode_value (len, p, &p);
                                        memcpy (p, buf2, len);
                                        p += p2 - buf2;
                                        g_free (buf2);
                                } else {
                                        encode_value (0, p, &p);
                                }
                        }

                        /* Emit the IL ranges too, since they might not be available at runtime */
                        encode_value (clause->try_offset, p, &p);
                        encode_value (clause->try_len, p, &p);
                        encode_value (clause->handler_offset, p, &p);
                        encode_value (clause->handler_len, p, &p);

                        /* Emit a list of nesting clauses */
                        for (i = 0; i < header->num_clauses; ++i) {
                                gint32 cindex1 = k;
                                MonoExceptionClause *clause1 = &header->clauses [cindex1];
                                gint32 cindex2 = i;
                                MonoExceptionClause *clause2 = &header->clauses [cindex2];

                                if (cindex1 != cindex2 && clause1->try_offset >= clause2->try_offset && clause1->handler_offset <= clause2->handler_offset)
                                        encode_value (i, p, &p);
                        }
                        encode_value (-1, p, &p);
                }
        } else {
                if (jinfo->num_clauses)
                        encode_value (jinfo->num_clauses, p, &p);

                for (k = 0; k < jinfo->num_clauses; ++k) {
                        MonoJitExceptionInfo *ei = &jinfo->clauses [k];

                        encode_value (ei->flags, p, &p);
#ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
                        /* Not used for catch clauses */
                        if (ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
                                encode_value (ei->exvar_offset, p, &p);
#else
                        encode_value (ei->exvar_offset, p, &p);
#endif

                        if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER || ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)
                                encode_value ((gint)((guint8*)ei->data.filter - code), p, &p);
                        else {
                                if (ei->data.catch_class) {
                                        guint8 *buf2, *p2;
                                        int len;

                                        buf2 = (guint8 *)g_malloc (4096);
                                        p2 = buf2;
                                        encode_klass_ref (acfg, ei->data.catch_class, p2, &p2);
                                        len = p2 - buf2;
                                        g_assert (len < 4096);
                                        encode_value (len, p, &p);
                                        memcpy (p, buf2, len);
                                        p += p2 - buf2;
                                        g_free (buf2);
                                } else {
                                        encode_value (0, p, &p);
                                }
                        }

                        encode_value ((gint)((guint8*)ei->try_start - code), p, &p);
                        encode_value ((gint)((guint8*)ei->try_end - code), p, &p);
                        encode_value ((gint)((guint8*)ei->handler_start - code), p, &p);
                }
        }

        if (jinfo->has_try_block_holes) {
                MonoTryBlockHoleTableJitInfo *table = mono_jit_info_get_try_block_hole_table_info (jinfo);
                for (i = 0; i < table->num_holes; ++i) {
                        MonoTryBlockHoleJitInfo *hole = &table->holes [i];
                        encode_value (hole->clause, p, &p);
                        encode_value (hole->length, p, &p);
                        encode_value (hole->offset, p, &p);
                }
        }

        if (jinfo->has_arch_eh_info) {
                MonoArchEHJitInfo *eh_info;

                eh_info = mono_jit_info_get_arch_eh_info (jinfo);
                encode_value (eh_info->stack_size, p, &p);
                encode_value (eh_info->epilog_size, p, &p);
        }

        if (jinfo->has_generic_jit_info) {
                MonoGenericJitInfo *gi = mono_jit_info_get_generic_jit_info (jinfo);
                MonoGenericSharingContext* gsctx = gi->generic_sharing_context;
                guint8 *buf2, *p2;
                int len;

                encode_value (gi->nlocs, p, &p);
                if (gi->nlocs) {
                        for (i = 0; i < gi->nlocs; ++i) {
                                MonoDwarfLocListEntry *entry = &gi->locations [i];

                                encode_value (entry->is_reg ? 1 : 0, p, &p);
                                encode_value (entry->reg, p, &p);
                                if (!entry->is_reg)
                                        encode_value (entry->offset, p, &p);
                                if (i == 0)
                                        g_assert (entry->from == 0);
                                else
                                        encode_value (entry->from, p, &p);
                                encode_value (entry->to, p, &p);
                        }
                } else {
                        if (!cfg->compile_llvm) {
                                encode_value (gi->has_this ? 1 : 0, p, &p);
                                encode_value (gi->this_reg, p, &p);
                                encode_value (gi->this_offset, p, &p);
                        }
                }

                /* 
                 * Need to encode jinfo->method too, since it is not equal to 'method'
                 * when using generic sharing.
                 */
                buf2 = (guint8 *)g_malloc (4096);
                p2 = buf2;
                encode_method_ref (acfg, jinfo->d.method, p2, &p2);
                len = p2 - buf2;
                g_assert (len < 4096);
                encode_value (len, p, &p);
                memcpy (p, buf2, len);
                p += p2 - buf2;
                g_free (buf2);

                if (gsctx && gsctx->is_gsharedvt) {
                        encode_value (1, p, &p);
                } else {
                        encode_value (0, p, &p);
                }
        }

        if (seq_points_size)
                p += mono_seq_point_info_write (seq_points, p);

        g_assert (debug_info_size < buf_size);

        encode_value (debug_info_size, p, &p);
        if (debug_info_size) {
                memcpy (p, debug_info, debug_info_size);
                p += debug_info_size;
                g_free (debug_info);
        }

        /* GC Map */
        if (cfg->gc_map) {
                encode_value (cfg->gc_map_size, p, &p);
                /* The GC map requires 4 bytes of alignment */
                while ((gsize)p % 4)
                        p ++;
                memcpy (p, cfg->gc_map, cfg->gc_map_size);
                p += cfg->gc_map_size;
        }

        acfg->stats.ex_info_size += p - buf;

        g_assert (p - buf < buf_size);

        /* Emit info */
        /* The GC Map requires 4 byte alignment */
        cfg->ex_info_offset = add_to_blob_aligned (acfg, buf, p - buf, cfg->gc_map ? 4 : 1);
        g_free (buf);
}

static guint32
emit_klass_info (MonoAotCompile *acfg, guint32 token)
{
        ERROR_DECL (error);
        MonoClass *klass = mono_class_get_checked (acfg->image, token, error);
        guint8 *p, *buf;
        int i, buf_size, res;
        gboolean no_special_static, cant_encode;
        gpointer iter = NULL;

        if (!klass) {
                mono_error_cleanup (error);

                buf_size = 16;

                p = buf = (guint8 *)g_malloc (buf_size);

                /* Mark as unusable */
                encode_value (-1, p, &p);

                res = add_to_blob (acfg, buf, p - buf);
                g_free (buf);

                return res;
        }
                
        buf_size = 10240 + (m_class_get_vtable_size (klass) * 16);
        p = buf = (guint8 *)g_malloc (buf_size);

        g_assert (klass);

        mono_class_init_internal (klass);

        mono_class_get_nested_types (klass, &iter);
        g_assert (m_class_is_nested_classes_inited (klass));

        mono_class_setup_vtable (klass);

        /* 
         * Emit all the information which is required for creating vtables so
         * the runtime does not need to create the MonoMethod structures which
         * take up a lot of space.
         */

        no_special_static = !mono_class_has_special_static_fields (klass);

        /* Check whenever we have enough info to encode the vtable */
        cant_encode = FALSE;
        MonoMethod **klass_vtable = m_class_get_vtable (klass);
        for (i = 0; i < m_class_get_vtable_size (klass); ++i) {
                MonoMethod *cm = klass_vtable [i];

                if (cm && mono_method_signature_internal (cm)->is_inflated && !g_hash_table_lookup (acfg->token_info_hash, cm))
                        cant_encode = TRUE;
        }

        mono_class_has_finalizer (klass);
        if (mono_class_has_failure (klass))
                cant_encode = TRUE;

        if (mono_class_is_gtd (klass) || cant_encode) {
                encode_value (-1, p, &p);
        } else {
                gboolean has_nested = mono_class_get_nested_classes_property (klass) != NULL;
                encode_value (m_class_get_vtable_size (klass), p, &p);
                encode_value ((m_class_has_weak_fields (klass) << 9) | (mono_class_is_gtd (klass) ? (1 << 8) : 0) | (no_special_static << 7) | (m_class_has_static_refs (klass) << 6) | (m_class_has_references (klass) << 5) | ((m_class_is_blittable (klass) << 4) | (has_nested ? 1 : 0) << 3) | (m_class_has_cctor (klass) << 2) | (m_class_has_finalize (klass) << 1) | m_class_is_ghcimpl (klass), p, &p);
                if (m_class_has_cctor (klass))
                        encode_method_ref (acfg, mono_class_get_cctor (klass), p, &p);
                if (m_class_has_finalize (klass))
                        encode_method_ref (acfg, mono_class_get_finalizer (klass), p, &p);
 
                encode_value (m_class_get_instance_size (klass), p, &p);
                encode_value (mono_class_data_size (klass), p, &p);
                encode_value (m_class_get_packing_size (klass), p, &p);
                encode_value (m_class_get_min_align (klass), p, &p);

                for (i = 0; i < m_class_get_vtable_size (klass); ++i) {
                        MonoMethod *cm = klass_vtable [i];

                        if (cm)
                                encode_method_ref (acfg, cm, p, &p);
                        else
                                encode_value (0, p, &p);
                }
        }

        acfg->stats.class_info_size += p - buf;

        g_assert (p - buf < buf_size);
        res = add_to_blob (acfg, buf, p - buf);
        g_free (buf);

        return res;
}

static char*
get_plt_entry_debug_sym (MonoAotCompile *acfg, MonoJumpInfo *ji, GHashTable *cache)
{
        char *debug_sym = NULL;
        char *prefix;

        if (acfg->llvm && llvm_acfg->aot_opts.static_link) {
                /* Need to add a prefix to create unique symbols */
                prefix = g_strdup_printf ("plt_%s_", acfg->assembly_name_sym);
        } else {
#if defined(TARGET_WIN32) && defined(TARGET_X86)
                prefix = mangle_symbol_alloc ("plt_");
#else
                prefix = g_strdup ("plt_");
#endif
        }

        switch (ji->type) {
        case MONO_PATCH_INFO_METHOD:
                debug_sym = get_debug_sym (ji->data.method, prefix, cache);
                break;
        case MONO_PATCH_INFO_JIT_ICALL_ID:
                debug_sym = g_strdup_printf ("%s_jit_icall_%s", prefix, mono_find_jit_icall_info (ji->data.jit_icall_id)->name);
                break;
        case MONO_PATCH_INFO_RGCTX_FETCH:
                debug_sym = g_strdup_printf ("%s_rgctx_fetch_%d", prefix, acfg->label_generator ++);
                break;
        case MONO_PATCH_INFO_ICALL_ADDR:
        case MONO_PATCH_INFO_ICALL_ADDR_CALL: {
                char *s = get_debug_sym (ji->data.method, "", cache);
                
                debug_sym = g_strdup_printf ("%s_icall_native_%s", prefix, s);
                g_free (s);
                break;
        }
        case MONO_PATCH_INFO_SPECIFIC_TRAMPOLINE_LAZY_FETCH_ADDR:
                debug_sym = g_strdup_printf ("%s_jit_icall_native_specific_trampoline_lazy_fetch_%lu", prefix, (gulong)ji->data.uindex);
                break;
        case MONO_PATCH_INFO_JIT_ICALL_ADDR:
                debug_sym = g_strdup_printf ("%s_jit_icall_native_%s", prefix, mono_find_jit_icall_info (ji->data.jit_icall_id)->name);
                break;
        default:
                break;
        }

        g_free (prefix);

        return sanitize_symbol (acfg, debug_sym);
}

/*
 * Calls made from AOTed code are routed through a table of jumps similar to the
 * ELF PLT (Program Linkage Table). Initially the PLT entries jump to code which transfers
 * control to the AOT runtime through a trampoline.
 */
static void
emit_plt (MonoAotCompile *acfg)
{
        int i;

        if (acfg->aot_opts.llvm_only) {
                g_assert (acfg->plt_offset == 1);
                return;
        }

        emit_line (acfg);

        emit_section_change (acfg, ".text", 0);
        emit_alignment_code (acfg, 16);
        emit_info_symbol (acfg, "plt", TRUE);
        emit_label (acfg, acfg->plt_symbol);

        for (i = 0; i < acfg->plt_offset; ++i) {
                char *debug_sym = NULL;
                MonoPltEntry *plt_entry = NULL;

                if (i == 0)
                        /* 
                         * The first plt entry is unused.
                         */
                        continue;

                plt_entry = (MonoPltEntry *)g_hash_table_lookup (acfg->plt_offset_to_entry, GUINT_TO_POINTER (i));

                debug_sym = plt_entry->debug_sym;

                if (acfg->thumb_mixed && !plt_entry->jit_used)
                        /* Emit only a thumb version */
                        continue;

                /* Skip plt entries not actually called */
                if (!plt_entry->jit_used && !plt_entry->llvm_used)
                        continue;

                if (acfg->llvm && !acfg->thumb_mixed) {
                        emit_label (acfg, plt_entry->llvm_symbol);
                        if (acfg->llvm) {
                                emit_global_inner (acfg, plt_entry->llvm_symbol, TRUE);
#if defined(TARGET_MACH)
                                fprintf (acfg->fp, ".private_extern %s\n", plt_entry->llvm_symbol);
#endif
                        }
                }

                if (debug_sym) {
                        if (acfg->need_no_dead_strip) {
                                emit_unset_mode (acfg);
                                fprintf (acfg->fp, "    .no_dead_strip %s\n", debug_sym);
                        }
                        emit_local_symbol (acfg, debug_sym, NULL, TRUE);
                        emit_label (acfg, debug_sym);
                }

                emit_label (acfg, plt_entry->symbol);

                arch_emit_plt_entry (acfg, acfg->got_symbol, (acfg->plt_got_offset_base + i) * sizeof (target_mgreg_t), acfg->plt_got_info_offsets [i]);

                if (debug_sym)
                        emit_symbol_size (acfg, debug_sym, ".");
        }

        if (acfg->thumb_mixed) {
                /* Make sure the ARM symbols don't alias the thumb ones */
                emit_zero_bytes (acfg, 16);

                /* 
                 * Emit a separate set of PLT entries using thumb2 which is called by LLVM generated
                 * code.
                 */
                for (i = 0; i < acfg->plt_offset; ++i) {
                        char *debug_sym = NULL;
                        MonoPltEntry *plt_entry = NULL;

                        if (i == 0)
                                continue;

                        plt_entry = (MonoPltEntry *)g_hash_table_lookup (acfg->plt_offset_to_entry, GUINT_TO_POINTER (i));

                        /* Skip plt entries not actually called by LLVM code */
                        if (!plt_entry->llvm_used)
                                continue;

                        if (acfg->aot_opts.write_symbols) {
                                if (plt_entry->debug_sym)
                                        debug_sym = g_strdup_printf ("%s_thumb", plt_entry->debug_sym);
                        }

                        if (debug_sym) {
#if defined(TARGET_MACH)
                                fprintf (acfg->fp, "    .thumb_func %s\n", debug_sym);
                                fprintf (acfg->fp, "    .no_dead_strip %s\n", debug_sym);
#endif
                                emit_local_symbol (acfg, debug_sym, NULL, TRUE);
                                emit_label (acfg, debug_sym);
                        }
                        fprintf (acfg->fp, "\n.thumb_func\n");

                        emit_label (acfg, plt_entry->llvm_symbol);

                        if (acfg->llvm)
                                emit_global_inner (acfg, plt_entry->llvm_symbol, TRUE);

                        arch_emit_llvm_plt_entry (acfg, acfg->got_symbol, (acfg->plt_got_offset_base + i) * sizeof (target_mgreg_t), acfg->plt_got_info_offsets [i]);

                        if (debug_sym) {
                                emit_symbol_size (acfg, debug_sym, ".");
                                g_free (debug_sym);
                        }
                }
        }

        emit_symbol_size (acfg, acfg->plt_symbol, ".");

        emit_info_symbol (acfg, "plt_end", TRUE);

        arch_emit_unwind_info_sections (acfg, "plt", "plt_end", NULL);
}

/*
 * emit_trampoline_full:
 *
 *   If EMIT_TINFO is TRUE, emit additional information which can be used to create a MonoJitInfo for this trampoline by
 * create_jit_info_for_trampoline ().
 */
static G_GNUC_UNUSED void
emit_trampoline_full (MonoAotCompile *acfg, MonoTrampInfo *info, gboolean emit_tinfo)
{
        char start_symbol [MAX_SYMBOL_SIZE];
        char end_symbol [MAX_SYMBOL_SIZE];
        char symbol [MAX_SYMBOL_SIZE];
        guint32 buf_size, info_offset;
        MonoJumpInfo *patch_info;
        guint8 *buf, *p;
        GPtrArray *patches;
        char *name;
        guint8 *code;
        guint32 code_size;
        MonoJumpInfo *ji;
        GSList *unwind_ops;

        g_assert (info);

        name = info->name;
        code = info->code;
        code_size = info->code_size;
        ji = info->ji;
        unwind_ops = info->unwind_ops;

        /* Emit code */

        sprintf (start_symbol, "%s%s", acfg->user_symbol_prefix, name);

        emit_section_change (acfg, ".text", 0);
        emit_global (acfg, start_symbol, TRUE);
        emit_alignment_code (acfg, AOT_FUNC_ALIGNMENT);
        emit_label (acfg, start_symbol);

        sprintf (symbol, "%snamed_%s", acfg->temp_prefix, name);
        emit_label (acfg, symbol);

        /* 
         * The code should access everything through the GOT, so we pass
         * TRUE here.
         */
        emit_and_reloc_code (acfg, NULL, code, code_size, ji, TRUE, NULL);

        emit_symbol_size (acfg, start_symbol, ".");

        if (emit_tinfo) {
                sprintf (end_symbol, "%snamede_%s", acfg->temp_prefix, name);
                emit_label (acfg, end_symbol);
        }

        /* Emit info */

        /* Sort relocations */
        patches = g_ptr_array_new ();
        for (patch_info = ji; patch_info; patch_info = patch_info->next)
                if (patch_info->type != MONO_PATCH_INFO_NONE)
                        g_ptr_array_add (patches, patch_info);
        g_ptr_array_sort (patches, compare_patches);

        buf_size = patches->len * 128 + 128;
        buf = (guint8 *)g_malloc (buf_size);
        p = buf;

        encode_patch_list (acfg, patches, patches->len, FALSE, p, &p);
        g_assert (p - buf < buf_size);
        g_ptr_array_free (patches, TRUE);

        sprintf (symbol, "%s%s_p", acfg->user_symbol_prefix, name);

        info_offset = add_to_blob (acfg, buf, p - buf);

        emit_section_change (acfg, RODATA_SECT, 0);
        emit_global (acfg, symbol, FALSE);
        emit_label (acfg, symbol);

        emit_int32 (acfg, info_offset);

        if (emit_tinfo) {
                guint8 *encoded;
                guint32 encoded_len;
                guint32 uw_offset;

                /*
                 * Emit additional information which can be used to reconstruct a partial MonoTrampInfo.
                 */
                encoded = mono_unwind_ops_encode (info->unwind_ops, &encoded_len);
                uw_offset = get_unwind_info_offset (acfg, encoded, encoded_len);
                g_free (encoded);

                emit_symbol_diff (acfg, end_symbol, start_symbol, 0);
                emit_int32 (acfg, uw_offset);
        }

        /* Emit debug info */
        if (unwind_ops) {
                char symbol2 [MAX_SYMBOL_SIZE];

                sprintf (symbol, "%s", name);
                sprintf (symbol2, "%snamed_%s", acfg->temp_prefix, name);

                arch_emit_unwind_info_sections (acfg, start_symbol, end_symbol, unwind_ops);

                if (acfg->dwarf)
                        mono_dwarf_writer_emit_trampoline (acfg->dwarf, symbol, symbol2, NULL, NULL, code_size, unwind_ops);
        }

        g_free (buf);
}

static G_GNUC_UNUSED void
emit_trampoline (MonoAotCompile *acfg, MonoTrampInfo *info)
{
        emit_trampoline_full (acfg, info, TRUE);
}

static void
emit_trampolines (MonoAotCompile *acfg)
{
        char symbol [MAX_SYMBOL_SIZE];
        char end_symbol [MAX_SYMBOL_SIZE];
        int i, tramp_got_offset;
        int ntype;
#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
        int tramp_type;
#endif

        if (!mono_aot_mode_is_full (&acfg->aot_opts) && !mono_aot_mode_is_interp (&acfg->aot_opts))
                return;
        if (acfg->aot_opts.llvm_only)
                return;
        
        g_assert (acfg->image->assembly);

        /* Currently, we emit most trampolines into the mscorlib AOT image. */
        if (mono_is_corlib_image(acfg->image->assembly->image)) {
#ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
                MonoTrampInfo *info;

                /*
                 * Emit the generic trampolines.
                 *
                 * We could save some code by treating the generic trampolines as a wrapper
                 * method, but that approach has its own complexities, so we choose the simpler
                 * method.
                 */
                for (tramp_type = 0; tramp_type < MONO_TRAMPOLINE_NUM; ++tramp_type) {
                        /* we overload the boolean here to indicate the slightly different trampoline needed, see mono_arch_create_generic_trampoline() */
#ifdef DISABLE_REMOTING
                        if (tramp_type == MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING)
                                continue;
#endif
                        mono_arch_create_generic_trampoline ((MonoTrampolineType)tramp_type, &info, acfg->aot_opts.use_trampolines_page? 2: TRUE);
                        emit_trampoline (acfg, info);
                        mono_tramp_info_free (info);
                }

                /* Emit the exception related code pieces */
                mono_arch_get_restore_context (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_get_call_filter (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_get_throw_exception (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_get_rethrow_exception (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_get_rethrow_preserve_exception (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_get_throw_corlib_exception (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

#ifdef MONO_ARCH_HAVE_SDB_TRAMPOLINES
                mono_arch_create_sdb_trampoline (TRUE, &info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);

                mono_arch_create_sdb_trampoline (FALSE, &info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);
#endif

#ifdef MONO_ARCH_GSHAREDVT_SUPPORTED
                mono_arch_get_gsharedvt_trampoline (&info, TRUE);
                if (info) {
                        emit_trampoline_full (acfg, info, TRUE);

                        /* Create a separate out trampoline for more information in stack traces */
                        info->name = g_strdup ("gsharedvt_out_trampoline");
                        emit_trampoline_full (acfg, info, TRUE);
                        mono_tramp_info_free (info);
                }
#endif

#if defined(MONO_ARCH_HAVE_GET_TRAMPOLINES)
                {
                        GSList *l = mono_arch_get_trampolines (TRUE);

                        while (l) {
                                MonoTrampInfo *info = (MonoTrampInfo *)l->data;

                                emit_trampoline (acfg, info);
                                l = l->next;
                        }
                }
#endif

                for (i = 0; i < acfg->aot_opts.nrgctx_fetch_trampolines; ++i) {
                        int offset;

                        offset = MONO_RGCTX_SLOT_MAKE_RGCTX (i);
                        mono_arch_create_rgctx_lazy_fetch_trampoline (offset, &info, TRUE);
                        emit_trampoline (acfg, info);
                        mono_tramp_info_free (info);

                        offset = MONO_RGCTX_SLOT_MAKE_MRGCTX (i);
                        mono_arch_create_rgctx_lazy_fetch_trampoline (offset, &info, TRUE);
                        emit_trampoline (acfg, info);
                        mono_tramp_info_free (info);
                }

#ifdef MONO_ARCH_HAVE_GENERAL_RGCTX_LAZY_FETCH_TRAMPOLINE
                mono_arch_create_general_rgctx_lazy_fetch_trampoline (&info, TRUE);
                emit_trampoline (acfg, info);
                mono_tramp_info_free (info);
#endif

                {
                        GSList *l;

                        /* delegate_invoke_impl trampolines */
                        l = mono_arch_get_delegate_invoke_impls ();
                        while (l) {
                                MonoTrampInfo *info = (MonoTrampInfo *)l->data;

                                emit_trampoline (acfg, info);
                                l = l->next;
                        }
                }

                if (mono_aot_mode_is_interp (&acfg->aot_opts) && mono_is_corlib_image (acfg->image->assembly->image)) {
                        mono_arch_get_interp_to_native_trampoline (&info);
                        emit_trampoline (acfg, info);

#ifdef MONO_ARCH_HAVE_INTERP_ENTRY_TRAMPOLINE
                        mono_arch_get_native_to_interp_trampoline (&info);
                        emit_trampoline (acfg, info);
#endif
                }

#endif /* #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES */

                /* Emit trampolines which are numerous */

                /*
                 * These include the following:
                 * - specific trampolines
                 * - static rgctx invoke trampolines
                 * - imt trampolines
                 * These trampolines have the same code, they are parameterized by GOT 
                 * slots. 
                 * They are defined in this file, in the arch_... routines instead of
                 * in tramp-<ARCH>.c, since it is easier to do it this way.
                 */

                /*
                 * When running in aot-only mode, we can't create specific trampolines at 
                 * runtime, so we create a few, and save them in the AOT file. 
                 * Normal trampolines embed their argument as a literal inside the 
                 * trampoline code, we can't do that here, so instead we embed an offset
                 * which needs to be added to the trampoline address to get the address of
                 * the GOT slot which contains the argument value.
                 * The generated trampolines jump to the generic trampolines using another
                 * GOT slot, which will be setup by the AOT loader to point to the 
                 * generic trampoline code of the given type.
                 */

                /*
                 * FIXME: Maybe we should use more specific trampolines (i.e. one class init for
                 * each class).
                 */

                emit_section_change (acfg, ".text", 0);

                tramp_got_offset = acfg->got_offset;

                for (ntype = 0; ntype < MONO_AOT_TRAMP_NUM; ++ntype) {
                        switch (ntype) {
                        case MONO_AOT_TRAMP_SPECIFIC:
                                sprintf (symbol, "specific_trampolines");
                                break;
                        case MONO_AOT_TRAMP_STATIC_RGCTX:
                                sprintf (symbol, "static_rgctx_trampolines");
                                break;
                        case MONO_AOT_TRAMP_IMT:
                                sprintf (symbol, "imt_trampolines");
                                break;
                        case MONO_AOT_TRAMP_GSHAREDVT_ARG:
                                sprintf (symbol, "gsharedvt_arg_trampolines");
                                break;
                        case MONO_AOT_TRAMP_FTNPTR_ARG:
                                sprintf (symbol, "ftnptr_arg_trampolines");
                                break;
                        case MONO_AOT_TRAMP_UNBOX_ARBITRARY:
                                sprintf (symbol, "unbox_arbitrary_trampolines");
                                break;
                        default:
                                g_assert_not_reached ();
                        }

                        sprintf (end_symbol, "%s_e", symbol);

                        if (acfg->aot_opts.write_symbols)
                                emit_local_symbol (acfg, symbol, end_symbol, TRUE);

                        emit_alignment_code (acfg, AOT_FUNC_ALIGNMENT);
                        emit_info_symbol (acfg, symbol, TRUE);

                        acfg->trampoline_got_offset_base [ntype] = tramp_got_offset;

                        for (i = 0; i < acfg->num_trampolines [ntype]; ++i) {
                                int tramp_size = 0;

                                switch (ntype) {
                                case MONO_AOT_TRAMP_SPECIFIC:
                                        arch_emit_specific_trampoline (acfg, tramp_got_offset, &tramp_size);
                                        tramp_got_offset += 2;
                                break;
                                case MONO_AOT_TRAMP_STATIC_RGCTX:
                                        arch_emit_static_rgctx_trampoline (acfg, tramp_got_offset, &tramp_size);                                
                                        tramp_got_offset += 2;
                                        break;
                                case MONO_AOT_TRAMP_IMT:
                                        arch_emit_imt_trampoline (acfg, tramp_got_offset, &tramp_size);
                                        tramp_got_offset += 1;
                                        break;
                                case MONO_AOT_TRAMP_GSHAREDVT_ARG:
                                        arch_emit_gsharedvt_arg_trampoline (acfg, tramp_got_offset, &tramp_size);                               
                                        tramp_got_offset += 2;
                                        break;
                                case MONO_AOT_TRAMP_FTNPTR_ARG:
                                        arch_emit_ftnptr_arg_trampoline (acfg, tramp_got_offset, &tramp_size);
                                        tramp_got_offset += 2;
                                        break;
                                case MONO_AOT_TRAMP_UNBOX_ARBITRARY:
                                        arch_emit_unbox_arbitrary_trampoline (acfg, tramp_got_offset, &tramp_size);
                                        tramp_got_offset += 1;
                                        break;
                                default:
                                        g_assert_not_reached ();
                                }
                                if (!acfg->trampoline_size [ntype]) {
                                        g_assert (tramp_size);
                                        acfg->trampoline_size [ntype] = tramp_size;
                                }
                        }

                        emit_label (acfg, end_symbol);
                        emit_int32 (acfg, 0);
                }

                arch_emit_specific_trampoline_pages (acfg);

                /* Reserve some entries at the end of the GOT for our use */
                acfg->num_trampoline_got_entries = tramp_got_offset - acfg->got_offset;
        }

        acfg->got_offset += acfg->num_trampoline_got_entries;
}

static gboolean
str_begins_with (const char *str1, const char *str2)
{
        int len = strlen (str2);
        return strncmp (str1, str2, len) == 0;
}

void*
mono_aot_readonly_field_override (MonoClassField *field)
{
        ReadOnlyValue *rdv;
        for (rdv = readonly_values; rdv; rdv = rdv->next) {
                char *p = rdv->name;
                int len;
                len = strlen (m_class_get_name_space (field->parent));
                if (strncmp (p, m_class_get_name_space (field->parent), len))
                        continue;
                p += len;
                if (*p++ != '.')
                        continue;
                len = strlen (m_class_get_name (field->parent));
                if (strncmp (p, m_class_get_name (field->parent), len))
                        continue;
                p += len;
                if (*p++ != '.')
                        continue;
                if (strcmp (p, field->name))
                        continue;
                switch (rdv->type) {
                case MONO_TYPE_I1:
                        return &rdv->value.i1;
                case MONO_TYPE_I2:
                        return &rdv->value.i2;
                case MONO_TYPE_I4:
                        return &rdv->value.i4;
                default:
                        break;
                }
        }
        return NULL;
}

static void
add_readonly_value (MonoAotOptions *opts, const char *val)
{
        ReadOnlyValue *rdv;
        const char *fval;
        const char *tval;
        /* the format of val is:
         * namespace.typename.fieldname=type/value
         * type can be i1 for uint8/int8/boolean, i2 for uint16/int16/char, i4 for uint32/int32
         */
        fval = strrchr (val, '/');
        if (!fval) {
                fprintf (stderr, "AOT : invalid format for readonly field '%s', missing /.\n", val);
                exit (1);
        }
        tval = strrchr (val, '=');
        if (!tval) {
                fprintf (stderr, "AOT : invalid format for readonly field '%s', missing =.\n", val);
                exit (1);
        }
        rdv = g_new0 (ReadOnlyValue, 1);
        rdv->name = (char *)g_malloc0 (tval - val + 1);
        memcpy (rdv->name, val, tval - val);
        tval++;
        fval++;
        if (strncmp (tval, "i1", 2) == 0) {
                rdv->value.i1 = atoi (fval);
                rdv->type = MONO_TYPE_I1;
        } else if (strncmp (tval, "i2", 2) == 0) {
                rdv->value.i2 = atoi (fval);
                rdv->type = MONO_TYPE_I2;
        } else if (strncmp (tval, "i4", 2) == 0) {
                rdv->value.i4 = atoi (fval);
                rdv->type = MONO_TYPE_I4;
        } else {
                fprintf (stderr, "AOT : unsupported type for readonly field '%s'.\n", tval);
                exit (1);
        }
        rdv->next = readonly_values;
        readonly_values = rdv;
}

static gchar *
clean_path (gchar * path)
{
        if (!path)
                return NULL;

        if (g_str_has_suffix (path, G_DIR_SEPARATOR_S))
                return path;

        gchar *clean = g_strconcat (path, G_DIR_SEPARATOR_S, (const char*)NULL);
        g_free (path);

        return clean;
}

static const gchar *
wrap_path (const gchar * path)
{
        int len;
        if (!path)
                return NULL;

        // If the string contains no spaces, just return the original string.
        if (strstr (path, " ") == NULL)
                return path;

        // If the string is already wrapped in quotes, return it.
        len = strlen (path);
        if (len >= 2 && path[0] == '\"' && path[len-1] == '\"')
                return path;

        // If the string contains spaces, then wrap it in quotes.
        gchar *clean = g_strdup_printf ("\"%s\"", path);

        return clean;
}

// Duplicate a char range and add it to a ptrarray, but only if it is nonempty
static void
ptr_array_add_range_if_nonempty(GPtrArray *args, gchar const *start, gchar const *end)
{
        ptrdiff_t len = end-start;
        if (len > 0)
                g_ptr_array_add (args, g_strndup (start, len));
}

static GPtrArray *
mono_aot_split_options (const char *aot_options)
{
        enum MonoAotOptionState {
                MONO_AOT_OPTION_STATE_DEFAULT,
                MONO_AOT_OPTION_STATE_STRING,
                MONO_AOT_OPTION_STATE_ESCAPE,
        };

        GPtrArray *args = g_ptr_array_new ();
        enum MonoAotOptionState state = MONO_AOT_OPTION_STATE_DEFAULT;
        gchar const *opt_start = aot_options;
        gboolean end_of_string = FALSE;
        gchar cur;

        g_return_val_if_fail (aot_options != NULL, NULL);

        while ((cur = *aot_options) != '\0') {
                if (state == MONO_AOT_OPTION_STATE_ESCAPE)
                        goto next;

                switch (cur) {
                case '"':
                        // If we find a quote, then if we're in the default case then
                        // it means we've found the start of a string, if not then it
                        // means we've found the end of the string and should switch
                        // back to the default case.            
                        switch (state) {
                        case MONO_AOT_OPTION_STATE_DEFAULT:
                                state = MONO_AOT_OPTION_STATE_STRING;
                                break;
                        case MONO_AOT_OPTION_STATE_STRING:
                                state = MONO_AOT_OPTION_STATE_DEFAULT;
                                break;
                        case MONO_AOT_OPTION_STATE_ESCAPE:
                                g_assert_not_reached ();
                                break;
                        }
                        break;
                case '\\':
                        // If we've found an escaping operator, then this means we
                        // should not process the next character if inside a string.            
                        if (state == MONO_AOT_OPTION_STATE_STRING) 
                                state = MONO_AOT_OPTION_STATE_ESCAPE;
                        break;
                case ',':
                        // If we're in the default state then this means we've found
                        // an option, store it for later processing.
                        if (state == MONO_AOT_OPTION_STATE_DEFAULT)
                                goto new_opt;
                        break;
                }

        next:
                aot_options++;
        restart:
                // If the next character is end of string, then process the last option.
                if (*(aot_options) == '\0') {
                        end_of_string = TRUE;
                        goto new_opt;
                }
                continue;

        new_opt:
                ptr_array_add_range_if_nonempty (args, opt_start, aot_options);
                opt_start = ++aot_options;
                if (end_of_string)
                        break;
                goto restart; // Check for null and continue loop
        }

        return args;
}

static void
mono_aot_parse_options (const char *aot_options, MonoAotOptions *opts)
{
        GPtrArray* args;

        args = mono_aot_split_options (aot_options ? aot_options : "");
        for (int i = 0; i < args->len; ++i) {
                const char *arg = (const char *)g_ptr_array_index (args, i);

                if (str_begins_with (arg, "outfile=")) {
                        opts->outfile = g_strdup (arg + strlen ("outfile="));
                } else if (str_begins_with (arg, "llvm-outfile=")) {
                        opts->llvm_outfile = g_strdup (arg + strlen ("llvm-outfile="));
                } else if (str_begins_with (arg, "temp-path=")) {
                        opts->temp_path = clean_path (g_strdup (arg + strlen ("temp-path=")));
                } else if (str_begins_with (arg, "save-temps")) {
                        opts->save_temps = TRUE;
                } else if (str_begins_with (arg, "keep-temps")) {
                        opts->save_temps = TRUE;
                } else if (str_begins_with (arg, "write-symbols")) {
                        opts->write_symbols = TRUE;
                } else if (str_begins_with (arg, "no-write-symbols")) {
                        opts->write_symbols = FALSE;
                // Intentionally undocumented -- one-off experiment
                } else if (str_begins_with (arg, "metadata-only")) {
                        opts->metadata_only = TRUE;
                } else if (str_begins_with (arg, "bind-to-runtime-version")) {
                        opts->bind_to_runtime_version = TRUE;
                } else if (str_begins_with (arg, "full")) {
                        opts->mode = MONO_AOT_MODE_FULL;
                } else if (str_begins_with (arg, "hybrid")) {
                        opts->mode = MONO_AOT_MODE_HYBRID;                      
                } else if (str_begins_with (arg, "interp")) {
                        opts->interp = TRUE;
                } else if (str_begins_with (arg, "threads=")) {
                        opts->nthreads = atoi (arg + strlen ("threads="));
                } else if (str_begins_with (arg, "static")) {
                        opts->static_link = TRUE;
                        opts->no_dlsym = TRUE;
                } else if (str_begins_with (arg, "asmonly")) {
                        opts->asm_only = TRUE;
                } else if (str_begins_with (arg, "asmwriter")) {
                        opts->asm_writer = TRUE;
                } else if (str_begins_with (arg, "nodebug")) {
                        opts->nodebug = TRUE;
                } else if (str_begins_with (arg, "dwarfdebug")) {
                        opts->dwarf_debug = TRUE;
                // Intentionally undocumented -- No one remembers what this does. It appears to be ARM-only
                } else if (str_begins_with (arg, "nopagetrampolines")) {
                        opts->use_trampolines_page = FALSE;
                } else if (str_begins_with (arg, "ntrampolines=")) {
                        opts->ntrampolines = atoi (arg + strlen ("ntrampolines="));
                } else if (str_begins_with (arg, "nrgctx-trampolines=")) {
                        opts->nrgctx_trampolines = atoi (arg + strlen ("nrgctx-trampolines="));
                } else if (str_begins_with (arg, "nrgctx-fetch-trampolines=")) {
                        opts->nrgctx_fetch_trampolines = atoi (arg + strlen ("nrgctx-fetch-trampolines="));
                } else if (str_begins_with (arg, "nimt-trampolines=")) {
                        opts->nimt_trampolines = atoi (arg + strlen ("nimt-trampolines="));
                } else if (str_begins_with (arg, "ngsharedvt-trampolines=")) {
                        opts->ngsharedvt_arg_trampolines = atoi (arg + strlen ("ngsharedvt-trampolines="));
                } else if (str_begins_with (arg, "nftnptr-arg-trampolines=")) {
                        opts->nftnptr_arg_trampolines = atoi (arg + strlen ("nftnptr-arg-trampolines="));
                } else if (str_begins_with (arg, "nunbox-arbitrary-trampolines=")) {
                        opts->nunbox_arbitrary_trampolines = atoi (arg + strlen ("unbox-arbitrary-trampolines="));
                } else if (str_begins_with (arg, "tool-prefix=")) {
                        opts->tool_prefix = g_strdup (arg + strlen ("tool-prefix="));
                } else if (str_begins_with (arg, "ld-flags=")) {
                        opts->ld_flags = g_strdup (arg + strlen ("ld-flags="));                 
                } else if (str_begins_with (arg, "soft-debug")) {
                        opts->soft_debug = TRUE;
                // Intentionally undocumented x2-- deprecated
                } else if (str_begins_with (arg, "gen-seq-points-file=")) {
                        fprintf (stderr, "Mono Warning: aot option gen-seq-points-file= is deprecated.\n");
                } else if (str_begins_with (arg, "gen-seq-points-file")) {
                        fprintf (stderr, "Mono Warning: aot option gen-seq-points-file is deprecated.\n");
                } else if (str_begins_with (arg, "msym-dir=")) {
                        mini_debug_options.no_seq_points_compact_data = FALSE;
                        opts->gen_msym_dir = TRUE;
                        opts->gen_msym_dir_path = g_strdup (arg + strlen ("msym_dir="));
                } else if (str_begins_with (arg, "direct-pinvoke")) {
                        opts->direct_pinvoke = TRUE;
                } else if (str_begins_with (arg, "direct-icalls")) {
                        opts->direct_icalls = TRUE;
                } else if (str_begins_with (arg, "no-direct-calls")) {
                        opts->no_direct_calls = TRUE;
                } else if (str_begins_with (arg, "print-skipped")) {
                        opts->print_skipped_methods = TRUE;
                } else if (str_begins_with (arg, "stats")) {
                        opts->stats = TRUE;
                // Intentionally undocumented-- has no known function other than to debug the compiler
                } else if (str_begins_with (arg, "no-instances")) {
                        opts->no_instances = TRUE;
                // Intentionally undocumented x4-- Used for internal debugging of compiler
                } else if (str_begins_with (arg, "log-generics")) {
                        opts->log_generics = TRUE;
                } else if (str_begins_with (arg, "log-instances=")) {
                        opts->log_instances = TRUE;
                        opts->instances_logfile_path = g_strdup (arg + strlen ("log-instances="));
                } else if (str_begins_with (arg, "log-instances")) {
                        opts->log_instances = TRUE;
                } else if (str_begins_with (arg, "internal-logfile=")) {
                        opts->logfile = g_strdup (arg + strlen ("internal-logfile="));
                } else if (str_begins_with (arg, "dedup-skip")) {
                        opts->dedup = TRUE;
                } else if (str_begins_with (arg, "dedup-include=")) {
                        opts->dedup_include = g_strdup (arg + strlen ("dedup-include="));
                } else if (str_begins_with (arg, "mtriple=")) {
                        opts->mtriple = g_strdup (arg + strlen ("mtriple="));
                } else if (str_begins_with (arg, "llvm-path=")) {
                        opts->llvm_path = clean_path (g_strdup (arg + strlen ("llvm-path=")));
                } else if (!strcmp (arg, "try-llvm")) {
                        // If we can load LLVM, use it
                        // Note: if you call this function from anywhere but mono_compile_assembly,
                        // this will only set the try_llvm attribute and not do the probing / set the
                        // attribute.
                        opts->try_llvm = TRUE;
                } else if (!strcmp (arg, "llvm")) {
                        opts->llvm = TRUE;
                } else if (str_begins_with (arg, "readonly-value=")) {
                        add_readonly_value (opts, arg + strlen ("readonly-value="));
                } else if (str_begins_with (arg, "info")) {
                        printf ("AOT target setup: %s.\n", AOT_TARGET_STR);
                        exit (0);
                // Intentionally undocumented: Used for precise stack maps, which are not available yet
                } else if (str_begins_with (arg, "gc-maps")) {
                        mini_gc_enable_gc_maps_for_aot ();
                // Intentionally undocumented: Used for internal debugging
                } else if (str_begins_with (arg, "dump")) {
                        opts->dump_json = TRUE;
                } else if (str_begins_with (arg, "llvmonly")) {
                        opts->mode = MONO_AOT_MODE_FULL;
                        opts->llvm = TRUE;
                        opts->llvm_only = TRUE;
                } else if (str_begins_with (arg, "data-outfile=")) {
                        opts->data_outfile = g_strdup (arg + strlen ("data-outfile="));
                } else if (str_begins_with (arg, "profile=")) {
                        opts->profile_files = g_list_append (opts->profile_files, g_strdup (arg + strlen ("profile=")));
                } else if (!strcmp (arg, "profile-only")) {
                        opts->profile_only = TRUE;
                } else if (!strcmp (arg, "verbose")) {
                        opts->verbose = TRUE;
                } else if (str_begins_with (arg, "llvmopts=")){
                        if (opts->llvm_opts) {
                                char *s = g_strdup_printf ("%s %s", opts->llvm_opts, arg + strlen ("llvmopts="));
                                g_free (opts->llvm_opts);
                                opts->llvm_opts = s;
                        } else {
                                opts->llvm_opts = g_strdup (arg + strlen ("llvmopts="));
                        }
                } else if (str_begins_with (arg, "llvmllc=")){
                        opts->llvm_llc = g_strdup (arg + strlen ("llvmllc="));
                } else if (!strcmp (arg, "deterministic")) {
                        opts->deterministic = TRUE;
                } else if (!strcmp (arg, "no-opt")) {
                        opts->no_opt = TRUE;
                } else if (str_begins_with (arg, "clangxx=")) {
                        opts->clangxx = g_strdup (arg + strlen ("clangxx="));
                } else if (str_begins_with (arg, "depfile=")) {
                        opts->depfile = g_strdup (arg + strlen ("depfile="));
                } else if (str_begins_with (arg, "help") || str_begins_with (arg, "?")) {
                        printf ("Supported options for --aot:\n");
                        printf ("    asmonly\n");
                        printf ("    bind-to-runtime-version\n");
                        printf ("    bitcode\n");
                        printf ("    data-outfile=\n");
                        printf ("    direct-icalls\n");
                        printf ("    direct-pinvoke\n");
                        printf ("    dwarfdebug\n");
                        printf ("    full\n");
                        printf ("    hybrid\n");
                        printf ("    info\n");
                        printf ("    keep-temps\n");
                        printf ("    llvm\n");
                        printf ("    llvmonly\n");
                        printf ("    llvm-outfile=\n");
                        printf ("    llvm-path=\n");
                        printf ("    msym-dir=\n");
                        printf ("    mtriple\n");
                        printf ("    nimt-trampolines=\n");
                        printf ("    nodebug\n");
                        printf ("    no-direct-calls\n");
                        printf ("    no-write-symbols\n");
                        printf ("    nrgctx-trampolines=\n");
                        printf ("    nrgctx-fetch-trampolines=\n");
                        printf ("    ngsharedvt-trampolines=\n");
                        printf ("    nftnptr-arg-trampolines=\n");
                        printf ("    nunbox-arbitrary-trampolines=\n");
                        printf ("    ntrampolines=\n");
                        printf ("    outfile=\n");
                        printf ("    profile=\n");
                        printf ("    profile-only\n");
                        printf ("    print-skipped-methods\n");
                        printf ("    readonly-value=\n");
                        printf ("    save-temps\n");
                        printf ("    soft-debug\n");
                        printf ("    static\n");
                        printf ("    stats\n");
                        printf ("    temp-path=\n");
                        printf ("    tool-prefix=\n");
                        printf ("    threads=\n");
                        printf ("    write-symbols\n");
                        printf ("    verbose\n");
                        printf ("    no-opt\n");
                        printf ("    llvmopts=\n");
                        printf ("    llvmllc=\n");
                        printf ("    clangxx=\n");
                        printf ("    depfile=\n");
                        printf ("    help/?\n");
                        exit (0);
                } else {
                        fprintf (stderr, "AOT : Unknown argument '%s'.\n", arg);
                        exit (1);
                }

                g_free ((gpointer) arg);
        }

        if (opts->use_trampolines_page) {
                opts->ntrampolines = 0;
                opts->nrgctx_trampolines = 0;
                opts->nimt_trampolines = 0;
                opts->ngsharedvt_arg_trampolines = 0;
                opts->nftnptr_arg_trampolines = 0;
                opts->nunbox_arbitrary_trampolines = 0;
        }

        g_ptr_array_free (args, /*free_seg=*/TRUE);
}

static void
add_token_info_hash (gpointer key, gpointer value, gpointer user_data)
{
        MonoMethod *method = (MonoMethod*)key;
        MonoJumpInfoToken *ji = (MonoJumpInfoToken*)value;
        MonoAotCompile *acfg = (MonoAotCompile *)user_data;
        MonoJumpInfoToken *new_ji;

        new_ji = (MonoJumpInfoToken *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfoToken));
        new_ji->image = ji->image;
        new_ji->token = ji->token;
        g_hash_table_insert (acfg->token_info_hash, method, new_ji);
}

static gboolean
can_encode_class (MonoAotCompile *acfg, MonoClass *klass)
{
        if (m_class_get_type_token (klass))
                return TRUE;
        if ((m_class_get_byval_arg (klass)->type == MONO_TYPE_VAR) || (m_class_get_byval_arg (klass)->type == MONO_TYPE_MVAR) || (m_class_get_byval_arg (klass)->type == MONO_TYPE_PTR))
                return TRUE;
        if (m_class_get_rank (klass))
                return can_encode_class (acfg, m_class_get_element_class (klass));
        return FALSE;
}

static gboolean
can_encode_method (MonoAotCompile *acfg, MonoMethod *method)
{
                if (method->wrapper_type) {
                        switch (method->wrapper_type) {
                        case MONO_WRAPPER_NONE:
                        case MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK:
                        case MONO_WRAPPER_XDOMAIN_INVOKE:
                        case MONO_WRAPPER_STFLD:
                        case MONO_WRAPPER_LDFLD:
                        case MONO_WRAPPER_LDFLDA:
                        case MONO_WRAPPER_STELEMREF:
                        case MONO_WRAPPER_PROXY_ISINST:
                        case MONO_WRAPPER_ALLOC:
                        case MONO_WRAPPER_REMOTING_INVOKE:
                        case MONO_WRAPPER_OTHER:
                        case MONO_WRAPPER_WRITE_BARRIER:
                        case MONO_WRAPPER_DELEGATE_INVOKE:
                        case MONO_WRAPPER_DELEGATE_BEGIN_INVOKE:
                        case MONO_WRAPPER_DELEGATE_END_INVOKE:
                        case MONO_WRAPPER_SYNCHRONIZED:
                        case MONO_WRAPPER_MANAGED_TO_NATIVE:
                                break;
                        case MONO_WRAPPER_MANAGED_TO_MANAGED:
                        case MONO_WRAPPER_CASTCLASS: {
                                WrapperInfo *info = mono_marshal_get_wrapper_info (method);

                                if (info)
                                        return TRUE;
                                else
                                        return FALSE;
                                break;
                        }
                        default:
                                //printf ("Skip (wrapper call): %d -> %s\n", patch_info->type, mono_method_full_name (patch_info->data.method, TRUE));
                                return FALSE;
                        }
                } else {
                        if (!method->token) {
                                /* The method is part of a constructed type like Int[,].Set (). */
                                if (!g_hash_table_lookup (acfg->token_info_hash, method)) {
                                        if (m_class_get_rank (method->klass))
                                                return TRUE;
                                        return FALSE;
                                }
                        }
                }
                return TRUE;
}

static gboolean
can_encode_patch (MonoAotCompile *acfg, MonoJumpInfo *patch_info)
{
        switch (patch_info->type) {
        case MONO_PATCH_INFO_METHOD:
        case MONO_PATCH_INFO_METHOD_FTNDESC:
        case MONO_PATCH_INFO_METHODCONST:
        case MONO_PATCH_INFO_METHOD_CODE_SLOT: {
                MonoMethod *method = patch_info->data.method;

                return can_encode_method (acfg, method);
        }
        case MONO_PATCH_INFO_VTABLE:
        case MONO_PATCH_INFO_CLASS:
        case MONO_PATCH_INFO_IID:
        case MONO_PATCH_INFO_ADJUSTED_IID:
                if (!can_encode_class (acfg, patch_info->data.klass)) {
                        //printf ("Skip: %s\n", mono_type_full_name (m_class_get_byval_arg (patch_info->data.klass)));
                        return FALSE;
                }
                break;
        case MONO_PATCH_INFO_DELEGATE_TRAMPOLINE: {
                if (!can_encode_class (acfg, patch_info->data.del_tramp->klass)) {
                        //printf ("Skip: %s\n", mono_type_full_name (m_class_get_byval_arg (patch_info->data.klass)));
                        return FALSE;
                }
                break;
        }
        case MONO_PATCH_INFO_RGCTX_FETCH:
        case MONO_PATCH_INFO_RGCTX_SLOT_INDEX: {
                MonoJumpInfoRgctxEntry *entry = patch_info->data.rgctx_entry;

                if (entry->in_mrgctx) {
                        if (!can_encode_method (acfg, entry->d.method))
                                return FALSE;
                } else {
                        if (!can_encode_class (acfg, entry->d.klass))
                                return FALSE;
                }
                if (!can_encode_patch (acfg, entry->data))
                        return FALSE;
                break;
        }
        default:
                break;
        }

        return TRUE;
}

static gboolean
is_concrete_type (MonoType *t)
{
        MonoClass *klass;
        int i;

        if (t->type == MONO_TYPE_VAR || t->type == MONO_TYPE_MVAR)
                return FALSE;
        if (t->type == MONO_TYPE_GENERICINST) {
                MonoGenericContext *orig_ctx;
                MonoGenericInst *inst;
                MonoType *arg;

                if (!MONO_TYPE_ISSTRUCT (t))
                        return TRUE;
                klass = mono_class_from_mono_type_internal (t);
                orig_ctx = &mono_class_get_generic_class (klass)->context;

                inst = orig_ctx->class_inst;
                if (inst) {
                        for (i = 0; i < inst->type_argc; ++i) {
                                arg = mini_get_underlying_type (inst->type_argv [i]);
                                if (!is_concrete_type (arg))
                                        return FALSE;
                        }
                }
                inst = orig_ctx->method_inst;
                if (inst) {
                        for (i = 0; i < inst->type_argc; ++i) {
                                arg = mini_get_underlying_type (inst->type_argv [i]);
                                if (!is_concrete_type (arg))
                                        return FALSE;
                        }
                }
        }
        return TRUE;
}

static MonoMethodSignature*
get_concrete_sig (MonoMethodSignature *sig)
{
        gboolean concrete = TRUE;

        if (!sig->has_type_parameters)
                return sig;

        /* For signatures created during generic sharing, convert them to a concrete signature if possible */
        MonoMethodSignature *copy = mono_metadata_signature_dup (sig);
        int i;

        //printf ("%s\n", mono_signature_full_name (sig));

        if (sig->ret->byref)
                copy->ret = m_class_get_this_arg (mono_defaults.int_class);
        else
                copy->ret = mini_get_underlying_type (sig->ret);
        if (!is_concrete_type (copy->ret))
                concrete = FALSE;
        for (i = 0; i < sig->param_count; ++i) {
                if (sig->params [i]->byref) {
                        MonoType *t = m_class_get_byval_arg (mono_class_from_mono_type_internal (sig->params [i]));
                        t = mini_get_underlying_type (t);
                        copy->params [i] = m_class_get_this_arg (mono_class_from_mono_type_internal (t));
                } else {
                        copy->params [i] = mini_get_underlying_type (sig->params [i]);
                }
                if (!is_concrete_type (copy->params [i]))
                        concrete = FALSE;
        }
        copy->has_type_parameters = 0;
        if (!concrete)
                return NULL;
        return copy;
}

/* LOCKING: Assumes the loader lock is held */
static void
add_gsharedvt_wrappers (MonoAotCompile *acfg, MonoMethodSignature *sig, gboolean gsharedvt_in, gboolean gsharedvt_out, gboolean interp_in)
{
        MonoMethod *wrapper;
        gboolean add_in = gsharedvt_in;
        gboolean add_out = gsharedvt_out;

        if (gsharedvt_in && g_hash_table_lookup (acfg->gsharedvt_in_signatures, sig))
                add_in = FALSE;
        if (gsharedvt_out && g_hash_table_lookup (acfg->gsharedvt_out_signatures, sig))
                add_out = FALSE;

        if (!add_in && !add_out)
                return;

        if (mini_is_gsharedvt_variable_signature (sig))
                return;

        if (add_in)
                g_hash_table_insert (acfg->gsharedvt_in_signatures, sig, sig);
        if (add_out)
                g_hash_table_insert (acfg->gsharedvt_out_signatures, sig, sig);

        sig = get_concrete_sig (sig);
        if (!sig)
                return;
        //printf ("%s\n", mono_signature_full_name (sig));

        if (gsharedvt_in) {
                wrapper = mini_get_gsharedvt_in_sig_wrapper (sig);
                add_extra_method (acfg, wrapper);
        }
        if (gsharedvt_out) {
                wrapper = mini_get_gsharedvt_out_sig_wrapper (sig);
                add_extra_method (acfg, wrapper);
        }

#ifndef MONO_ARCH_HAVE_INTERP_ENTRY_TRAMPOLINE
        if (interp_in) {
                wrapper = mini_get_interp_in_wrapper (sig);
                add_extra_method (acfg, wrapper);
                //printf ("X: %s\n", mono_method_full_name (wrapper, 1));
        }
#endif
}

/*
 * compile_method:
 *
 *   AOT compile a given method.
 * This function might be called by multiple threads, so it must be thread-safe.
 */
static void
compile_method (MonoAotCompile *acfg, MonoMethod *method)
{
        MonoCompile *cfg;
        MonoJumpInfo *patch_info;
        gboolean skip;
        int index, depth;
        MonoMethod *wrapped;
        gint64 jit_time_start;
        JitFlags flags;

        if (acfg->aot_opts.metadata_only)
                return;

        mono_acfg_lock (acfg);
        index = get_method_index (acfg, method);
        mono_acfg_unlock (acfg);

        /* fixme: maybe we can also precompile wrapper methods */
        if ((method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) ||
                (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
                (method->flags & METHOD_ATTRIBUTE_ABSTRACT)) {
                //printf ("Skip (impossible): %s\n", mono_method_full_name (method, TRUE));
                return;
        }

        if (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL)
                return;

        wrapped = mono_marshal_method_from_wrapper (method);
        if (wrapped && (wrapped->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) && wrapped->is_generic)
                // FIXME: The wrapper should be generic too, but it is not
                return;

        if (method->wrapper_type == MONO_WRAPPER_COMINTEROP)
                return;

        if (acfg->aot_opts.profile_only && !method->is_inflated && !g_hash_table_lookup (acfg->profile_methods, method))
                return;

        mono_atomic_inc_i32 (&acfg->stats.mcount);

#if 0
        if (method->is_generic || mono_class_is_gtd (method->klass)) {
                mono_atomic_inc_i32 (&acfg->stats.genericcount);
                return;
        }
#endif

        //acfg->aot_opts.print_skipped_methods = TRUE;

        /*
         * Since these methods are the only ones which are compiled with
         * AOT support, and they are not used by runtime startup/shutdown code,
         * the runtime will not see AOT methods during AOT compilation,so it
         * does not need to support them by creating a fake GOT etc.
         */
        flags = JIT_FLAG_AOT;
        if (mono_aot_mode_is_full (&acfg->aot_opts))
                flags = (JitFlags)(flags | JIT_FLAG_FULL_AOT);
        if (acfg->llvm)
                flags = (JitFlags)(flags | JIT_FLAG_LLVM);
        if (acfg->aot_opts.llvm_only)
                flags = (JitFlags)(flags | JIT_FLAG_LLVM_ONLY | JIT_FLAG_EXPLICIT_NULL_CHECKS);
        if (acfg->aot_opts.no_direct_calls)
                flags = (JitFlags)(flags | JIT_FLAG_NO_DIRECT_ICALLS);
        if (acfg->aot_opts.direct_pinvoke)
                flags = (JitFlags)(flags | JIT_FLAG_DIRECT_PINVOKE);
        if (acfg->aot_opts.interp)
                flags = (JitFlags)(flags | JIT_FLAG_INTERP);

        jit_time_start = mono_time_track_start ();
        cfg = mini_method_compile (method, acfg->opts, mono_get_root_domain (), flags, 0, index);
        mono_time_track_end (&mono_jit_stats.jit_time, jit_time_start);

        if (cfg->exception_type == MONO_EXCEPTION_GENERIC_SHARING_FAILED) {
                if (acfg->aot_opts.print_skipped_methods)
                        printf ("Skip (gshared failure): %s (%s)\n", mono_method_get_full_name (method), cfg->exception_message);
                mono_atomic_inc_i32 (&acfg->stats.genericcount);
                return;
        }
        if (cfg->exception_type != MONO_EXCEPTION_NONE) {
                /* Some instances cannot be JITted due to constraints etc. */
                if (!method->is_inflated)
                        report_loader_error (acfg, cfg->error, FALSE, "Unable to compile method '%s' due to: '%s'.\n", mono_method_get_full_name (method), mono_error_get_message (cfg->error));
                /* Let the exception happen at runtime */
                return;
        }

        if (cfg->disable_aot) {
                if (acfg->aot_opts.print_skipped_methods)
                        printf ("Skip (disabled): %s\n", mono_method_get_full_name (method));
                mono_atomic_inc_i32 (&acfg->stats.ocount);
                return;
        }
        cfg->method_index = index;

        /* Nullify patches which need no aot processing */
        for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                switch (patch_info->type) {
                case MONO_PATCH_INFO_LABEL:
                case MONO_PATCH_INFO_BB:
                        patch_info->type = MONO_PATCH_INFO_NONE;
                        break;
                default:
                        break;
                }
        }

        /* Collect method->token associations from the cfg */
        mono_acfg_lock (acfg);
        g_hash_table_foreach (cfg->token_info_hash, add_token_info_hash, acfg);
        mono_acfg_unlock (acfg);
        g_hash_table_destroy (cfg->token_info_hash);
        cfg->token_info_hash = NULL;

        /*
         * Check for absolute addresses.
         */
        skip = FALSE;
        for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                switch (patch_info->type) {
                case MONO_PATCH_INFO_ABS:
                        /* unable to handle this */
                        skip = TRUE;    
                        break;
                default:
                        break;
                }
        }

        if (skip) {
                if (acfg->aot_opts.print_skipped_methods)
                        printf ("Skip (abs call): %s\n", mono_method_get_full_name (method));
                mono_atomic_inc_i32 (&acfg->stats.abscount);
                return;
        }

        /* Lock for the rest of the code */
        mono_acfg_lock (acfg);

        if (cfg->gsharedvt)
                acfg->stats.method_categories [METHOD_CAT_GSHAREDVT] ++;
        else if (cfg->gshared)
                acfg->stats.method_categories [METHOD_CAT_INST] ++;
        else if (cfg->method->wrapper_type)
                acfg->stats.method_categories [METHOD_CAT_WRAPPER] ++;
        else
                acfg->stats.method_categories [METHOD_CAT_NORMAL] ++;

        /*
         * Check for methods/klasses we can't encode.
         */
        skip = FALSE;
        for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                if (!can_encode_patch (acfg, patch_info))
                        skip = TRUE;
        }

        if (skip) {
                if (acfg->aot_opts.print_skipped_methods)
                        printf ("Skip (patches): %s\n", mono_method_get_full_name (method));
                acfg->stats.ocount++;
                mono_acfg_unlock (acfg);
                return;
        }

        if (!cfg->compile_llvm)
                acfg->has_jitted_code = TRUE;

        if (method->is_inflated && acfg->aot_opts.log_instances) {
                if (acfg->instances_logfile)
                        fprintf (acfg->instances_logfile, "%s ### %d\n", mono_method_get_full_name (method), cfg->code_size);
                else
                        printf ("%s ### %d\n", mono_method_get_full_name (method), cfg->code_size);
        }

        /* Adds generic instances referenced by this method */
        /* 
         * The depth is used to avoid infinite loops when generic virtual recursion is 
         * encountered.
         */
        depth = GPOINTER_TO_UINT (g_hash_table_lookup (acfg->method_depth, method));
        if (!acfg->aot_opts.no_instances && depth < 32 && (mono_aot_mode_is_full (&acfg->aot_opts) || mono_aot_mode_is_hybrid (&acfg->aot_opts))) {
                for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                        switch (patch_info->type) {
                        case MONO_PATCH_INFO_RGCTX_FETCH:
                        case MONO_PATCH_INFO_RGCTX_SLOT_INDEX:
                        case MONO_PATCH_INFO_METHOD:
                        case MONO_PATCH_INFO_METHOD_FTNDESC:
                        case MONO_PATCH_INFO_METHOD_RGCTX: {
                                MonoMethod *m = NULL;

                                if (patch_info->type == MONO_PATCH_INFO_RGCTX_FETCH || patch_info->type == MONO_PATCH_INFO_RGCTX_SLOT_INDEX) {
                                        MonoJumpInfoRgctxEntry *e = patch_info->data.rgctx_entry;

                                        if (e->info_type == MONO_RGCTX_INFO_GENERIC_METHOD_CODE || e->info_type == MONO_RGCTX_INFO_METHOD_FTNDESC)
                                                m = e->data->data.method;
                                } else {
                                        m = patch_info->data.method;
                                }

                                if (!m)
                                        break;
                                if (m->is_inflated && (mono_aot_mode_is_full (&acfg->aot_opts) || mono_aot_mode_is_hybrid (&acfg->aot_opts))) {
                                        if (!(mono_class_generic_sharing_enabled (m->klass) &&
                                                  mono_method_is_generic_sharable_full (m, FALSE, FALSE, FALSE)) &&
                                                (!method_has_type_vars (m) || mono_method_is_generic_sharable_full (m, TRUE, TRUE, FALSE))) {
                                                if (m->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) {
                                                        if (mono_aot_mode_is_full (&acfg->aot_opts) && !method_has_type_vars (m))
                                                                add_extra_method_with_depth (acfg, mono_marshal_get_native_wrapper (m, TRUE, TRUE), depth + 1);
                                                } else {
                                                        add_extra_method_with_depth (acfg, m, depth + 1);
                                                        add_types_from_method_header (acfg, m);
                                                }
                                        }
                                        add_generic_class_with_depth (acfg, m->klass, depth + 5, "method");
                                }
                                if (m->wrapper_type == MONO_WRAPPER_MANAGED_TO_MANAGED) {
                                        WrapperInfo *info = mono_marshal_get_wrapper_info (m);

                                        if (info && info->subtype == WRAPPER_SUBTYPE_ELEMENT_ADDR)
                                                add_extra_method_with_depth (acfg, m, depth + 1);
                                }
                                break;
                        }
                        case MONO_PATCH_INFO_VTABLE: {
                                MonoClass *klass = patch_info->data.klass;

                                if (mono_class_is_ginst (klass) && !mini_class_is_generic_sharable (klass))
                                        add_generic_class_with_depth (acfg, klass, depth + 5, "vtable");
                                break;
                        }
                        case MONO_PATCH_INFO_SFLDA: {
                                MonoClass *klass = patch_info->data.field->parent;

                                /* The .cctor needs to run at runtime. */
                                if (mono_class_is_ginst (klass) && !mono_generic_context_is_sharable_full (&mono_class_get_generic_class (klass)->context, FALSE, FALSE) && mono_class_get_cctor (klass))
                                        add_extra_method_with_depth (acfg, mono_class_get_cctor (klass), depth + 1);
                                break;
                        }
                        default:
                                break;
                        }
                }
        }

        /* Determine whenever the method has GOT slots */
        for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                switch (patch_info->type) {
                case MONO_PATCH_INFO_GOT_OFFSET:
                case MONO_PATCH_INFO_NONE:
                case MONO_PATCH_INFO_GC_CARD_TABLE_ADDR:
                case MONO_PATCH_INFO_GC_NURSERY_START:
                case MONO_PATCH_INFO_GC_NURSERY_BITS:
                        break;
                case MONO_PATCH_INFO_IMAGE:
                        /* The assembly is stored in GOT slot 0 */
                        if (patch_info->data.image != acfg->image)
                                cfg->has_got_slots = TRUE;
                        break;
                default:
                        if (!is_plt_patch (patch_info) || (cfg->compile_llvm && acfg->aot_opts.llvm_only))
                                cfg->has_got_slots = TRUE;
                        break;
                }
        }

        if (!cfg->has_got_slots)
                mono_atomic_inc_i32 (&acfg->stats.methods_without_got_slots);

        /* Add gsharedvt wrappers for signatures used by the method */
        if (acfg->aot_opts.llvm_only) {
                GSList *l;

                if (!cfg->method->wrapper_type || cfg->method->wrapper_type == MONO_WRAPPER_DELEGATE_INVOKE)
                        /* These only need out wrappers */
                        add_gsharedvt_wrappers (acfg, mono_method_signature_internal (cfg->method), FALSE, TRUE, FALSE);

                for (l = cfg->signatures; l; l = l->next) {
                        MonoMethodSignature *sig = mono_metadata_signature_dup ((MonoMethodSignature*)l->data);

                        /* These only need in wrappers */
                        add_gsharedvt_wrappers (acfg, sig, TRUE, FALSE, FALSE);
                }

                for (l = cfg->interp_in_signatures; l; l = l->next) {
                        MonoMethodSignature *sig = mono_metadata_signature_dup ((MonoMethodSignature*)l->data);

                        add_gsharedvt_wrappers (acfg, sig, TRUE, FALSE, FALSE);
                }
        } else if (mono_aot_mode_is_full (&acfg->aot_opts) && mono_aot_mode_is_interp (&acfg->aot_opts)) {
                /* The interpreter uses these wrappers to call aot-ed code */
                if (!cfg->method->wrapper_type || cfg->method->wrapper_type == MONO_WRAPPER_DELEGATE_INVOKE)
                        add_gsharedvt_wrappers (acfg, mono_method_signature_internal (cfg->method), FALSE, TRUE, TRUE);
        }

        if (cfg->llvm_only)
                acfg->stats.llvm_count ++;

        /* 
         * FIXME: Instead of this mess, allocate the patches from the aot mempool.
         */
        /* Make a copy of the patch info which is in the mempool */
        {
                MonoJumpInfo *patches = NULL, *patches_end = NULL;

                for (patch_info = cfg->patch_info; patch_info; patch_info = patch_info->next) {
                        MonoJumpInfo *new_patch_info = mono_patch_info_dup_mp (acfg->mempool, patch_info);

                        if (!patches)
                                patches = new_patch_info;
                        else
                                patches_end->next = new_patch_info;
                        patches_end = new_patch_info;
                }
                cfg->patch_info = patches;
        }
        /* Make a copy of the unwind info */
        {
                GSList *l, *unwind_ops;
                MonoUnwindOp *op;

                unwind_ops = NULL;
                for (l = cfg->unwind_ops; l; l = l->next) {
                        op = (MonoUnwindOp *)mono_mempool_alloc (acfg->mempool, sizeof (MonoUnwindOp));
                        memcpy (op, l->data, sizeof (MonoUnwindOp));
                        unwind_ops = g_slist_prepend_mempool (acfg->mempool, unwind_ops, op);
                }
                cfg->unwind_ops = g_slist_reverse (unwind_ops);
        }
        /* Make a copy of the argument/local info */
        {
                ERROR_DECL (error);
                MonoInst **args, **locals;
                MonoMethodSignature *sig;
                MonoMethodHeader *header;
                int i;
                
                sig = mono_method_signature_internal (method);
                args = (MonoInst **)mono_mempool_alloc (acfg->mempool, sizeof (MonoInst*) * (sig->param_count + sig->hasthis));
                for (i = 0; i < sig->param_count + sig->hasthis; ++i) {
                        args [i] = (MonoInst *)mono_mempool_alloc (acfg->mempool, sizeof (MonoInst));
                        memcpy (args [i], cfg->args [i], sizeof (MonoInst));
                }
                cfg->args = args;

                header = mono_method_get_header_checked (method, error);
                mono_error_assert_ok (error); /* FIXME don't swallow the error */
                locals = (MonoInst **)mono_mempool_alloc (acfg->mempool, sizeof (MonoInst*) * header->num_locals);
                for (i = 0; i < header->num_locals; ++i) {
                        locals [i] = (MonoInst *)mono_mempool_alloc (acfg->mempool, sizeof (MonoInst));
                        memcpy (locals [i], cfg->locals [i], sizeof (MonoInst));
                }
                mono_metadata_free_mh (header);
                cfg->locals = locals;
        }

        /* Free some fields used by cfg to conserve memory */
        mono_empty_compile (cfg);

        //printf ("Compile:           %s\n", mono_method_full_name (method, TRUE));

        while (index >= acfg->cfgs_size) {
                MonoCompile **new_cfgs;
                int new_size;

                new_size = acfg->cfgs_size * 2;
                new_cfgs = g_new0 (MonoCompile*, new_size);
                memcpy (new_cfgs, acfg->cfgs, sizeof (MonoCompile*) * acfg->cfgs_size);
                g_free (acfg->cfgs);
                acfg->cfgs = new_cfgs;
                acfg->cfgs_size = new_size;
        }
        acfg->cfgs [index] = cfg;

        g_hash_table_insert (acfg->method_to_cfg, cfg->orig_method, cfg);

        /* Update global stats while holding a lock. */
        mono_update_jit_stats (cfg);

        /*
        if (cfg->orig_method->wrapper_type)
                g_ptr_array_add (acfg->extra_methods, cfg->orig_method);
        */

        mono_acfg_unlock (acfg);

        mono_atomic_inc_i32 (&acfg->stats.ccount);
}
 
static mono_thread_start_return_t WINAPI
compile_thread_main (gpointer user_data)
{
        MonoAotCompile *acfg = ((MonoAotCompile **)user_data) [0];
        GPtrArray *methods = ((GPtrArray **)user_data) [1];
        int i;

        mono_thread_set_name_constant_ignore_error (mono_thread_internal_current (), "AOT compiler", MonoSetThreadNameFlag_Permanent);

        for (i = 0; i < methods->len; ++i)
                compile_method (acfg, (MonoMethod *)g_ptr_array_index (methods, i));

        return 0;
}
 
/* Used by the LLVM backend */
guint32
mono_aot_get_got_offset (MonoJumpInfo *ji)
{
        return get_got_offset (llvm_acfg, TRUE, ji);
}

/*
 * mono_aot_is_shared_got_offset:
 *
 *   Return whenever OFFSET refers to a GOT slot which is preinitialized
 * when the AOT image is loaded.
 */
gboolean
mono_aot_is_shared_got_offset (int offset)
{
        return offset < llvm_acfg->nshared_got_entries;
}

char*
mono_aot_get_method_name (MonoCompile *cfg)
{
        MonoMethod *method = cfg->orig_method;

        /* Use the mangled name if possible */
        if (method->wrapper_type == MONO_WRAPPER_OTHER) {
                WrapperInfo *info = mono_marshal_get_wrapper_info (method);
                if (info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_IN_SIG || info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_OUT_SIG)
                        return mono_aot_get_mangled_method_name (method);
        }

        if (llvm_acfg->aot_opts.static_link)
                /* Include the assembly name too to avoid duplicate symbol errors */
                return g_strdup_printf ("%s_%s", llvm_acfg->assembly_name_sym, get_debug_sym (cfg->orig_method, "", llvm_acfg->method_label_hash));
        else
                return get_debug_sym (cfg->orig_method, "", llvm_acfg->method_label_hash);
}

static gboolean
append_mangled_type (GString *s, MonoType *t)
{
        if (t->byref)
                g_string_append_printf (s, "b");
        switch (t->type) {
        case MONO_TYPE_VOID:
                g_string_append_printf (s, "void");
                break;
        case MONO_TYPE_I1:
                g_string_append_printf (s, "i1");
                break;
        case MONO_TYPE_U1:
                g_string_append_printf (s, "u1");
                break;
        case MONO_TYPE_I2:
                g_string_append_printf (s, "i2");
                break;
        case MONO_TYPE_U2:
                g_string_append_printf (s, "u2");
                break;
        case MONO_TYPE_I4:
                g_string_append_printf (s, "i4");
                break;
        case MONO_TYPE_U4:
                g_string_append_printf (s, "u4");
                break;
        case MONO_TYPE_I8:
                g_string_append_printf (s, "i8");
                break;
        case MONO_TYPE_U8:
                g_string_append_printf (s, "u8");
                break;
        case MONO_TYPE_I:
                g_string_append_printf (s, "ii");
                break;
        case MONO_TYPE_U:
                g_string_append_printf (s, "ui");
                break;
        case MONO_TYPE_R4:
                g_string_append_printf (s, "fl");
                break;
        case MONO_TYPE_R8:
                g_string_append_printf (s, "do");
                break;
        case MONO_TYPE_OBJECT:
                g_string_append_printf (s, "obj");
                break;
        default: {
                char *fullname = mono_type_full_name (t);
                GString *temp;
                char *temps;
                int i, len;

                /*
                 * Have to create a mangled name which is:
                 * - a valid symbol
                 * - unique
                 */
                temp = g_string_new ("");
                len = strlen (fullname);
                for (i = 0; i < len; ++i) {
                        char c = fullname [i];
                        if (isalnum (c)) {
                                g_string_append_c (temp, c);
                        } else if (c == '_') {
                                g_string_append_c (temp, '_');
                                g_string_append_c (temp, '_');
                        } else {
                                g_string_append_c (temp, '_');
                                g_string_append_printf (temp, "%x", (int)c);
                        }
                }
                temps = g_string_free (temp, FALSE);
                /* Include the length to avoid different length type names aliasing each other */
                g_string_append_printf (s, "cl%x_%s_", (int)strlen (temps), temps);
                g_free (temps);
        }
        }
        if (t->attrs)
                g_string_append_printf (s, "_attrs_%d", t->attrs);
        return TRUE;
}

static gboolean
append_mangled_signature (GString *s, MonoMethodSignature *sig)
{
        int i;
        gboolean supported;

        if (sig->pinvoke)
                g_string_append_printf (s, "pinvoke_");
        supported = append_mangled_type (s, sig->ret);
        if (!supported)
                return FALSE;
                g_string_append_printf (s, "_");
        if (sig->hasthis)
                g_string_append_printf (s, "this_");
        for (i = 0; i < sig->param_count; ++i) {
                supported = append_mangled_type (s, sig->params [i]);
                if (!supported)
                        return FALSE;
        }

        return TRUE;
}

static void
append_mangled_wrapper_type (GString *s, guint32 wrapper_type) 
{
        const char *label;

        switch (wrapper_type) {
        case MONO_WRAPPER_REMOTING_INVOKE:
                label = "remoting_invoke";
                break;
        case MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK:
                label = "remoting_invoke_check";
                break;
        case MONO_WRAPPER_XDOMAIN_INVOKE:
                label = "remoting_invoke_xdomain";
                break;
        case MONO_WRAPPER_PROXY_ISINST:
                label = "proxy_isinst";
                break;
        case MONO_WRAPPER_LDFLD:
                label = "ldfld";
                break;
        case MONO_WRAPPER_LDFLDA:
                label = "ldflda";
                break;
        case MONO_WRAPPER_STFLD: 
                label = "stfld";
                break;
        case MONO_WRAPPER_ALLOC:
                label = "alloc";
                break;
        case MONO_WRAPPER_WRITE_BARRIER:
                label = "write_barrier";
                break;
        case MONO_WRAPPER_STELEMREF:
                label = "stelemref";
                break;
        case MONO_WRAPPER_OTHER:
                label = "unknown";
                break;
        case MONO_WRAPPER_MANAGED_TO_NATIVE:
                label = "man2native";
                break;
        case MONO_WRAPPER_SYNCHRONIZED:
                label = "synch";
                break;
        case MONO_WRAPPER_MANAGED_TO_MANAGED:
                label = "man2man";
                break;
        case MONO_WRAPPER_CASTCLASS:
                label = "castclass";
                break;
        case MONO_WRAPPER_RUNTIME_INVOKE:
                label = "run_invoke";
                break;
        case MONO_WRAPPER_DELEGATE_INVOKE:
                label = "del_inv";
                break;
        case MONO_WRAPPER_DELEGATE_BEGIN_INVOKE:
                label = "del_beg_inv";
                break;
        case MONO_WRAPPER_DELEGATE_END_INVOKE:
                label = "del_end_inv";
                break;
        case MONO_WRAPPER_NATIVE_TO_MANAGED:
                label = "native2man";
                break;
        default:
                g_assert_not_reached ();
        }

        g_string_append_printf (s, "%s_", label);
}

static void
append_mangled_wrapper_subtype (GString *s, WrapperSubtype subtype) 
{
        const char *label;

        switch (subtype) 
        {
        case WRAPPER_SUBTYPE_NONE:
                return;
        case WRAPPER_SUBTYPE_ELEMENT_ADDR:
                label = "elem_addr";
                break;
        case WRAPPER_SUBTYPE_STRING_CTOR:
                label = "str_ctor";
                break;
        case WRAPPER_SUBTYPE_VIRTUAL_STELEMREF:
                label = "virt_stelem";
                break;
        case WRAPPER_SUBTYPE_FAST_MONITOR_ENTER:
                label = "fast_mon_enter";
                break;
        case WRAPPER_SUBTYPE_FAST_MONITOR_ENTER_V4:
                label = "fast_mon_enter_4";
                break;
        case WRAPPER_SUBTYPE_FAST_MONITOR_EXIT:
                label = "fast_monitor_exit";
                break;
        case WRAPPER_SUBTYPE_PTR_TO_STRUCTURE:
                label = "ptr2struct";
                break;
        case WRAPPER_SUBTYPE_STRUCTURE_TO_PTR:
                label = "struct2ptr";
                break;
        case WRAPPER_SUBTYPE_CASTCLASS_WITH_CACHE:
                label = "castclass_w_cache";
                break;
        case WRAPPER_SUBTYPE_ISINST_WITH_CACHE:
                label = "isinst_w_cache";
                break;
        case WRAPPER_SUBTYPE_RUNTIME_INVOKE_NORMAL:
                label = "run_inv_norm";
                break;
        case WRAPPER_SUBTYPE_RUNTIME_INVOKE_DYNAMIC:
                label = "run_inv_dyn";
                break;
        case WRAPPER_SUBTYPE_RUNTIME_INVOKE_DIRECT:
                label = "run_inv_dir";
                break;
        case WRAPPER_SUBTYPE_RUNTIME_INVOKE_VIRTUAL:
                label = "run_inv_vir";
                break;
        case WRAPPER_SUBTYPE_ICALL_WRAPPER:
                label = "icall";
                break;
        case WRAPPER_SUBTYPE_NATIVE_FUNC_AOT:
                label = "native_func_aot";
                break;
        case WRAPPER_SUBTYPE_PINVOKE:
                label = "pinvoke";
                break;
        case WRAPPER_SUBTYPE_SYNCHRONIZED_INNER:
                label = "synch_inner";
                break;
        case WRAPPER_SUBTYPE_GSHAREDVT_IN:
                label = "gshared_in";
                break;
        case WRAPPER_SUBTYPE_GSHAREDVT_OUT:
                label = "gshared_out";
                break;
        case WRAPPER_SUBTYPE_ARRAY_ACCESSOR:
                label = "array_acc";
                break;
        case WRAPPER_SUBTYPE_GENERIC_ARRAY_HELPER:
                label = "generic_arry_help";
                break;
        case WRAPPER_SUBTYPE_DELEGATE_INVOKE_VIRTUAL:
                label = "del_inv_virt";
                break;
        case WRAPPER_SUBTYPE_DELEGATE_INVOKE_BOUND:
                label = "del_inv_bound";
                break;
        case WRAPPER_SUBTYPE_INTERP_IN:
                label = "interp_in";
                break;
        case WRAPPER_SUBTYPE_INTERP_LMF:
                label = "interp_lmf";
                break;
        case WRAPPER_SUBTYPE_GSHAREDVT_IN_SIG:
                label = "gsharedvt_in_sig";
                break;
        case WRAPPER_SUBTYPE_GSHAREDVT_OUT_SIG:
                label = "gsharedvt_out_sig";
                break;
        case WRAPPER_SUBTYPE_AOT_INIT:
                label = "aot_init";
                break;
        default:
                g_assert_not_reached ();
        }

        g_string_append_printf (s, "%s_", label);
}

static char *
sanitize_mangled_string (const char *input)
{
        GString *s = g_string_new ("");

        for (int i=0; input [i] != '\0'; i++) {
                char c = input [i];
                switch (c) {
                case '.':
                        g_string_append (s, "_dot_");
                        break;
                case ' ':
                        g_string_append (s, "_");
                        break;
                case '`':
                        g_string_append (s, "_bt_");
                        break;
                case '<':
                        g_string_append (s, "_le_");
                        break;
                case '>':
                        g_string_append (s, "_gt_");
                        break;
                case '/':
                        g_string_append (s, "_sl_");
                        break;
                case '[':
                        g_string_append (s, "_lbrack_");
                        break;
                case ']':
                        g_string_append (s, "_rbrack_");
                        break;
                case '(':
                        g_string_append (s, "_lparen_");
                        break;
                case '-':
                        g_string_append (s, "_dash_");
                        break;
                case ')':
                        g_string_append (s, "_rparen_");
                        break;
                case ',':
                        g_string_append (s, "_comma_");
                        break;
                case ':':
                        g_string_append (s, "_colon_");
                        break;
                default:
                        g_string_append_c (s, c);
                }
        }

        return g_string_free (s, FALSE);
}

static gboolean
append_mangled_klass (GString *s, MonoClass *klass)
{
        char *klass_desc = mono_class_full_name (klass);
        g_string_append_printf (s, "_%s_%s_", m_class_get_name_space (klass), klass_desc);
        g_free (klass_desc);

        // Success
        return TRUE;
}

static gboolean
append_mangled_method (GString *s, MonoMethod *method);

static gboolean
append_mangled_wrapper (GString *s, MonoMethod *method) 
{
        gboolean success = TRUE;
        gboolean append_sig = TRUE;
        WrapperInfo *info = mono_marshal_get_wrapper_info (method);
        g_string_append_printf (s, "wrapper_");
        /* Most wrappers are in mscorlib */
        if (m_class_get_image (method->klass) != mono_get_corlib ())
                g_string_append_printf (s, "%s_", m_class_get_image (method->klass)->assembly->aname.name);

        if (method->wrapper_type != MONO_WRAPPER_OTHER && method->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
                append_mangled_wrapper_type (s, method->wrapper_type);

        switch (method->wrapper_type) {
        case MONO_WRAPPER_REMOTING_INVOKE:
        case MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK:
        case MONO_WRAPPER_XDOMAIN_INVOKE: {
                MonoMethod *m = mono_marshal_method_from_wrapper (method);
                g_assert (m);
                success = success && append_mangled_method (s, m);
                break;
        }
        case MONO_WRAPPER_PROXY_ISINST:
        case MONO_WRAPPER_LDFLD:
        case MONO_WRAPPER_LDFLDA:
        case MONO_WRAPPER_STFLD: {
                g_assert (info);
                success = success && append_mangled_klass (s, info->d.proxy.klass);
                break;
        }
        case MONO_WRAPPER_ALLOC: {
                /* The GC name is saved once in MonoAotFileInfo */
                g_assert (info->d.alloc.alloc_type != -1);
                g_string_append_printf (s, "%d_", info->d.alloc.alloc_type);
                // SlowAlloc, etc
                g_string_append_printf (s, "%s_", method->name);
                break;
        }
        case MONO_WRAPPER_WRITE_BARRIER: {
                g_string_append_printf (s, "%s_", method->name);
                break;
        }
        case MONO_WRAPPER_STELEMREF: {
                append_mangled_wrapper_subtype (s, info->subtype);
                if (info->subtype == WRAPPER_SUBTYPE_VIRTUAL_STELEMREF)
                        g_string_append_printf (s, "%d", info->d.virtual_stelemref.kind);
                break;
        }
        case MONO_WRAPPER_OTHER: {
                append_mangled_wrapper_subtype (s, info->subtype);
                if (info->subtype == WRAPPER_SUBTYPE_PTR_TO_STRUCTURE ||
                        info->subtype == WRAPPER_SUBTYPE_STRUCTURE_TO_PTR)
                        success = success && append_mangled_klass (s, method->klass);
                else if (info->subtype == WRAPPER_SUBTYPE_SYNCHRONIZED_INNER)
                        success = success && append_mangled_method (s, info->d.synchronized_inner.method);
                else if (info->subtype == WRAPPER_SUBTYPE_ARRAY_ACCESSOR)
                        success = success && append_mangled_method (s, info->d.array_accessor.method);
                else if (info->subtype == WRAPPER_SUBTYPE_INTERP_IN)
                        append_mangled_signature (s, info->d.interp_in.sig);
                else if (info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_IN_SIG) {
                        append_mangled_signature (s, info->d.gsharedvt.sig);
                        append_sig = FALSE;
                } else if (info->subtype == WRAPPER_SUBTYPE_GSHAREDVT_OUT_SIG) {
                        append_mangled_signature (s, info->d.gsharedvt.sig);
                        append_sig = FALSE;
                } else if (info->subtype == WRAPPER_SUBTYPE_INTERP_LMF)
                        g_string_append_printf (s, "%s", method->name);
                else if (info->subtype == WRAPPER_SUBTYPE_AOT_INIT) {
                        g_string_append_printf (s, "%s_%d_", m_class_get_image (method->klass)->assembly->aname.name, info->d.aot_init.subtype);
                        append_sig = FALSE;
                }
                break;
        }
        case MONO_WRAPPER_MANAGED_TO_NATIVE: {
                append_mangled_wrapper_subtype (s, info->subtype);
                if (info->subtype == WRAPPER_SUBTYPE_ICALL_WRAPPER) {
                        const char *name = method->name;
                        const char *prefix = "__icall_wrapper_";
                        if (strstr (name, prefix) == name)
                                name += strlen (prefix);
                        g_string_append_printf (s, "%s", name);
                        append_sig = FALSE;
                } else if (info->subtype == WRAPPER_SUBTYPE_NATIVE_FUNC_AOT) {
                        success = success && append_mangled_method (s, info->d.managed_to_native.method);
                } else {
                        g_assert (info->subtype == WRAPPER_SUBTYPE_NONE || info->subtype == WRAPPER_SUBTYPE_PINVOKE);
                        success = success && append_mangled_method (s, info->d.managed_to_native.method);
                }
                break;
        }
        case MONO_WRAPPER_SYNCHRONIZED: {
                MonoMethod *m;

                m = mono_marshal_method_from_wrapper (method);
                g_assert (m);
                g_assert (m != method);
                success = success && append_mangled_method (s, m);
                break;
        }
        case MONO_WRAPPER_MANAGED_TO_MANAGED: {
                append_mangled_wrapper_subtype (s, info->subtype);

                if (info->subtype == WRAPPER_SUBTYPE_ELEMENT_ADDR) {
                        g_string_append_printf (s, "%d_", info->d.element_addr.rank);
                        g_string_append_printf (s, "%d_", info->d.element_addr.elem_size);
                } else if (info->subtype == WRAPPER_SUBTYPE_STRING_CTOR) {
                        success = success && append_mangled_method (s, info->d.string_ctor.method);
                } else if (info->subtype == WRAPPER_SUBTYPE_GENERIC_ARRAY_HELPER) {
                        success = success && append_mangled_method (s, info->d.generic_array_helper.method);
                } else {
                        success = FALSE;
                }
                break;
        }
        case MONO_WRAPPER_CASTCLASS: {
                append_mangled_wrapper_subtype (s, info->subtype);
                break;
        }
        case MONO_WRAPPER_RUNTIME_INVOKE: {
                append_mangled_wrapper_subtype (s, info->subtype);
                if (info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_DIRECT || info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_VIRTUAL)
                        success = success && append_mangled_method (s, info->d.runtime_invoke.method);
                else if (info->subtype == WRAPPER_SUBTYPE_RUNTIME_INVOKE_NORMAL)
                        success = success && append_mangled_signature (s, info->d.runtime_invoke.sig);
                break;
        }
        case MONO_WRAPPER_DELEGATE_INVOKE:
        case MONO_WRAPPER_DELEGATE_BEGIN_INVOKE:
        case MONO_WRAPPER_DELEGATE_END_INVOKE: {
                if (method->is_inflated) {
                        /* These wrappers are identified by their class */
                        g_string_append_printf (s, "i_");
                        success = success && append_mangled_klass (s, method->klass);
                } else {
                        WrapperInfo *info = mono_marshal_get_wrapper_info (method);

                        g_string_append_printf (s, "u_");
                        if (method->wrapper_type == MONO_WRAPPER_DELEGATE_INVOKE)
                                append_mangled_wrapper_subtype (s, info->subtype);
                        g_string_append_printf (s, "u_sigstart");
                }
                break;
        }
        case MONO_WRAPPER_NATIVE_TO_MANAGED: {
                g_assert (info);
                success = success && append_mangled_method (s, info->d.native_to_managed.method);
                success = success && append_mangled_klass (s, method->klass);
                break;
        }
        default:
                g_assert_not_reached ();
        }
        if (success && append_sig)
                success = append_mangled_signature (s, mono_method_signature_internal (method));
        return success;
}

static void
append_mangled_ginst (GString *str, MonoGenericInst *ginst)
{
        int i;

        for (i = 0; i < ginst->type_argc; ++i) {
                if (i > 0)
                        g_string_append (str, ", ");
                MonoType *type = ginst->type_argv [i];
                switch (type->type) {
                case MONO_TYPE_VAR:
                case MONO_TYPE_MVAR: {
                        MonoType *constraint = NULL;
                        if (type->data.generic_param)
                                constraint = type->data.generic_param->gshared_constraint;
                        if (constraint) {
                                g_assert (constraint->type != MONO_TYPE_VAR && constraint->type != MONO_TYPE_MVAR);
                                g_string_append (str, "gshared:");
                                mono_type_get_desc (str, constraint, TRUE);
                                break;
                        }
                        // Else falls through to common case
                }
                default:
                        mono_type_get_desc (str, type, TRUE);
                }
        }
}

static void
append_mangled_context (GString *str, MonoGenericContext *context)
{
        GString *res = g_string_new ("");

        g_string_append_printf (res, "gens_");
        g_string_append (res, "00");

        gboolean good = context->class_inst && context->class_inst->type_argc > 0;
        good = good || (context->method_inst && context->method_inst->type_argc > 0);
        g_assert (good);

        if (context->class_inst)
                append_mangled_ginst (res, context->class_inst);
        if (context->method_inst) {
                if (context->class_inst)
                        g_string_append (res, "11");
                append_mangled_ginst (res, context->method_inst);
        }
        g_string_append_printf (str, "gens_%s", res->str);
        g_free (res);
}

static gboolean
append_mangled_method (GString *s, MonoMethod *method)
{
        if (method->wrapper_type)
                return append_mangled_wrapper (s, method);

        if (method->is_inflated) {
                g_string_append_printf (s, "inflated_");
                MonoMethodInflated *imethod = (MonoMethodInflated*) method;
                g_assert (imethod->context.class_inst != NULL || imethod->context.method_inst != NULL);

                append_mangled_context (s, &imethod->context);
                g_string_append_printf (s, "_declared_by_%s_", m_class_get_image (imethod->declaring->klass)->assembly->aname.name);
                append_mangled_method (s, imethod->declaring);
        } else if (method->is_generic) {
                g_string_append_printf (s, "%s_", m_class_get_image (method->klass)->assembly->aname.name);

                g_string_append_printf (s, "generic_");
                append_mangled_klass (s, method->klass);
                g_string_append_printf (s, "_%s_", method->name);

                MonoGenericContainer *container = mono_method_get_generic_container (method);
                g_string_append_printf (s, "_");
                append_mangled_context (s, &container->context);

                return append_mangled_signature (s, mono_method_signature_internal (method));
        } else {
                g_string_append_printf (s, "%s", m_class_get_image (method->klass)->assembly->aname.name);
                append_mangled_klass (s, method->klass);
                g_string_append_printf (s, "_%s_", method->name);
                if (!append_mangled_signature (s, mono_method_signature_internal (method))) {
                        g_string_free (s, TRUE);
                        return FALSE;
                }
        }

        return TRUE;
}

/*
 * mono_aot_get_mangled_method_name:
 *
 *   Return a unique mangled name for METHOD, or NULL.
 */
char*
mono_aot_get_mangled_method_name (MonoMethod *method)
{
        // FIXME: use static cache (mempool?)
        // We call this a *lot*

        GString *s = g_string_new ("aot_");
        if (!append_mangled_method (s, method)) {
                g_string_free (s, TRUE);
                return NULL;
        } else {
                char *out = g_string_free (s, FALSE);
                // Scrub method and class names
                char *cleaned = sanitize_mangled_string (out);
                g_free (out);
                return cleaned;
        }
}

gboolean
mono_aot_is_direct_callable (MonoJumpInfo *patch_info)
{
        return is_direct_callable (llvm_acfg, NULL, patch_info);
}

void
mono_aot_mark_unused_llvm_plt_entry (MonoJumpInfo *patch_info)
{
        MonoPltEntry *plt_entry;

        plt_entry = get_plt_entry (llvm_acfg, patch_info);
        plt_entry->llvm_used = FALSE;
}

char*
mono_aot_get_direct_call_symbol (MonoJumpInfoType type, gconstpointer data)
{
        const char *sym = NULL;

        if (llvm_acfg->aot_opts.direct_icalls) {
                if (type == MONO_PATCH_INFO_JIT_ICALL_ADDR) {
                        /* Call to a C function implementing a jit icall */
                        sym = mono_find_jit_icall_info ((MonoJitICallId)(gsize)data)->c_symbol;
                } else if (type == MONO_PATCH_INFO_ICALL_ADDR_CALL) {
                        MonoMethod *method = (MonoMethod *)data;
                        if (!(method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
                                sym = lookup_icall_symbol_name_aot (method);
                        else if (llvm_acfg->aot_opts.direct_pinvoke)
                                sym = get_pinvoke_import (llvm_acfg, method);
                } else if (type == MONO_PATCH_INFO_JIT_ICALL_ID) {
                        MonoJitICallInfo const * const info = mono_find_jit_icall_info ((MonoJitICallId)(gsize)data);
                        char const * const name = info->c_symbol;
                        if (name && info->func == info->wrapper)
                                sym = name;
                }
                if (sym)
                        return g_strdup (sym);
        }
        return NULL;
}

char*
mono_aot_get_plt_symbol (MonoJumpInfoType type, gconstpointer data)
{
        MonoJumpInfo *ji = (MonoJumpInfo *)mono_mempool_alloc (llvm_acfg->mempool, sizeof (MonoJumpInfo));
        MonoPltEntry *plt_entry;
        const char *sym = NULL;

        ji->type = type;
        ji->data.target = data;

        if (!can_encode_patch (llvm_acfg, ji))
                return NULL;

        if (llvm_acfg->aot_opts.direct_icalls) {
                if (type == MONO_PATCH_INFO_JIT_ICALL_ADDR) {
                        /* Call to a C function implementing a jit icall */
                        sym = mono_find_jit_icall_info ((MonoJitICallId)(gsize)data)->c_symbol;
                } else if (type == MONO_PATCH_INFO_ICALL_ADDR_CALL) {
                        MonoMethod *method = (MonoMethod *)data;
                        if (!(method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL))
                                sym = lookup_icall_symbol_name_aot (method);
                }
                if (sym)
                        return g_strdup (sym);
        }

        plt_entry = get_plt_entry (llvm_acfg, ji);
        plt_entry->llvm_used = TRUE;

#if defined(TARGET_MACH)
        return g_strdup (plt_entry->llvm_symbol + strlen (llvm_acfg->llvm_label_prefix));
#else
        return g_strdup (plt_entry->llvm_symbol);
#endif
}

int
mono_aot_get_method_index (MonoMethod *method)
{
        g_assert (llvm_acfg);
        return get_method_index (llvm_acfg, method);
}

MonoJumpInfo*
mono_aot_patch_info_dup (MonoJumpInfo* ji)
{
        MonoJumpInfo *res;

        mono_acfg_lock (llvm_acfg);
        res = mono_patch_info_dup_mp (llvm_acfg->mempool, ji);
        mono_acfg_unlock (llvm_acfg);

        return res;
}

static int
execute_system (const char * command)
{
        int status = 0;

#if G_HAVE_API_SUPPORT(HAVE_CLASSIC_WINAPI_SUPPORT) && defined(HOST_WIN32)
        // We need an extra set of quotes around the whole command to properly handle commands 
        // with spaces since internally the command is called through "cmd /c.
        char * quoted_command = g_strdup_printf ("\"%s\"", command);

        int size =  MultiByteToWideChar (CP_UTF8, 0 , quoted_command , -1, NULL , 0);
        wchar_t* wstr = g_malloc (sizeof (wchar_t) * size);
        MultiByteToWideChar (CP_UTF8, 0, quoted_command, -1, wstr , size);
        status = _wsystem (wstr);
        g_free (wstr);

        g_free (quoted_command);
#elif defined (HAVE_SYSTEM)
        status = system (command);
#else
        g_assert_not_reached ();
#endif

        return status;
}

#ifdef ENABLE_LLVM

/*
 * emit_llvm_file:
 *
 *   Emit the LLVM code into an LLVM bytecode file, and compile it using the LLVM
 * tools.
 */
static gboolean
emit_llvm_file (MonoAotCompile *acfg)
{
        char *command, *opts, *tempbc, *optbc, *output_fname;

        if (acfg->aot_opts.llvm_only && acfg->aot_opts.asm_only) {
                if (acfg->aot_opts.no_opt)
                        tempbc = g_strdup (acfg->aot_opts.llvm_outfile);
                else
                        tempbc = g_strdup_printf ("%s.bc", acfg->tmpbasename);
                optbc = g_strdup (acfg->aot_opts.llvm_outfile);
        } else {
                tempbc = g_strdup_printf ("%s.bc", acfg->tmpbasename);
                optbc = g_strdup_printf ("%s.opt.bc", acfg->tmpbasename);
        }

        mono_llvm_emit_aot_module (tempbc, g_path_get_basename (acfg->image->name));

        if (acfg->aot_opts.no_opt)
                return TRUE;
        /*
         * FIXME: Experiment with adding optimizations, the -std-compile-opts set takes
         * a lot of time, and doesn't seem to save much space.
         * The following optimizations cannot be enabled:
         * - 'tailcallelim'
         * - 'jump-threading' changes our blockaddress references to int constants.
         * - 'basiccg' fails because it contains:
         * if (CS && !isa<IntrinsicInst>(II)) {
         * and isa<IntrinsicInst> is false for invokes to intrinsics (iltests.exe).
         * - 'prune-eh' and 'functionattrs' depend on 'basiccg'.
         * The opt list below was produced by taking the output of:
         * llvm-as < /dev/null | opt -O2 -disable-output -debug-pass=Arguments
         * then removing tailcallelim + the global opts.
         * strip-dead-prototypes deletes unused intrinsics definitions.
         */
        /* The dse pass is disabled because of #13734 and #17616 */
        /*
         * The dse bug is in DeadStoreElimination.cpp:isOverwrite ():
         * // If we have no DataLayout information around, then the size of the store
         *  // is inferrable from the pointee type.  If they are the same type, then
         * // we know that the store is safe.
         * if (AA.getDataLayout() == 0 &&
         * Later.Ptr->getType() == Earlier.Ptr->getType()) {
         * return OverwriteComplete;
         * Here, if 'Earlier' refers to a memset, and Later has no size info, it mistakenly thinks the memset is redundant.
         */
        if (acfg->aot_opts.llvm_only) {
                // FIXME: This doesn't work yet
                opts = g_strdup ("");
        } else {
                opts = g_strdup ("-O2 -disable-tail-calls -place-safepoints -spp-all-backedges");
        }

        if (acfg->aot_opts.llvm_opts) {
                opts = g_strdup_printf ("%s %s", opts, acfg->aot_opts.llvm_opts);
        }

        if (mono_use_fast_math) {
                // same parameters are passed to llc and LLVM JIT
                opts = g_strdup_printf ("%s -fp-contract=fast -enable-no-infs-fp-math -enable-no-nans-fp-math -enable-no-signed-zeros-fp-math -enable-no-trapping-fp-math -enable-unsafe-fp-math", opts);
        }

        command = g_strdup_printf ("\"%sopt\" -f %s -o \"%s\" \"%s\"", acfg->aot_opts.llvm_path, opts, optbc, tempbc);
        aot_printf (acfg, "Executing opt: %s\n", command);
        if (execute_system (command) != 0)
                return FALSE;
        g_free (opts);

        if (acfg->aot_opts.llvm_only && acfg->aot_opts.asm_only)
                /* Nothing else to do */
                return TRUE;

        if (acfg->aot_opts.llvm_only) {
                /* Use the stock clang from xcode */
                // FIXME: arch
                command = g_strdup_printf ("%s -fexceptions -fpic -O2 -fno-optimize-sibling-calls -Wno-override-module -c -o \"%s\" \"%s.opt.bc\"", acfg->aot_opts.clangxx, acfg->llvm_ofile, acfg->tmpbasename);

                aot_printf (acfg, "Executing clang: %s\n", command);
                if (execute_system (command) != 0)
                        return FALSE;
                return TRUE;
        }

        if (!acfg->llc_args)
                acfg->llc_args = g_string_new ("");

        /* Verbose asm slows down llc greatly */
        g_string_append (acfg->llc_args, " -asm-verbose=false");

        if (acfg->aot_opts.mtriple)
                g_string_append_printf (acfg->llc_args, " -mtriple=%s", acfg->aot_opts.mtriple);

#if defined(TARGET_X86_64_WIN32_MSVC)
        if (!acfg->aot_opts.mtriple)
                g_string_append_printf (acfg->llc_args, " -mtriple=%s", "x86_64-pc-windows-msvc");
#endif

        g_string_append (acfg->llc_args, " -disable-gnu-eh-frame -enable-mono-eh-frame");

        g_string_append_printf (acfg->llc_args, " -mono-eh-frame-symbol=%s%s", acfg->user_symbol_prefix, acfg->llvm_eh_frame_symbol);

        g_string_append_printf (acfg->llc_args, " -disable-tail-calls");

#if defined(TARGET_AMD64) || defined(TARGET_X86)
        /* This generates stack adjustments in the middle of functions breaking unwind info */
        g_string_append_printf (acfg->llc_args, " -no-x86-call-frame-opt");
#endif

#if ( defined(TARGET_MACH) && defined(TARGET_ARM) ) || defined(TARGET_ORBIS) || defined(TARGET_X86_64_WIN32_MSVC)
        g_string_append_printf (acfg->llc_args, " -relocation-model=pic");
#else
        if (llvm_acfg->aot_opts.static_link)
                g_string_append_printf (acfg->llc_args, " -relocation-model=static");
        else
                g_string_append_printf (acfg->llc_args, " -relocation-model=pic");
#endif

        if (acfg->llvm_owriter) {
                /* Emit an object file directly */
                output_fname = g_strdup_printf ("%s", acfg->llvm_ofile);
                g_string_append_printf (acfg->llc_args, " -filetype=obj");
        } else {
                output_fname = g_strdup_printf ("%s", acfg->llvm_sfile);
        }

        if (acfg->aot_opts.llvm_llc) {
                g_string_append_printf (acfg->llc_args, " %s", acfg->aot_opts.llvm_llc);
        }

        command = g_strdup_printf ("\"%sllc\" %s -o \"%s\" \"%s.opt.bc\"", acfg->aot_opts.llvm_path, acfg->llc_args->str, output_fname, acfg->tmpbasename);
        g_free (output_fname);

        aot_printf (acfg, "Executing llc: %s\n", command);

        if (execute_system (command) != 0)
                return FALSE;
        return TRUE;
}
#endif

/* Set the skip flag for methods which do not need to be emitted because of dedup */
static void
dedup_skip_methods (MonoAotCompile *acfg)
{
        int oindex, i;

        if (acfg->aot_opts.llvm_only)
                return;

        for (oindex = 0; oindex < acfg->method_order->len; ++oindex) {
                MonoCompile *cfg;
                MonoMethod *method;

                i = GPOINTER_TO_UINT (g_ptr_array_index (acfg->method_order, oindex));

                cfg = acfg->cfgs [i];

                if (!cfg)
                        continue;

                method = cfg->orig_method;

                gboolean dedup_collect = acfg->aot_opts.dedup || (acfg->aot_opts.dedup_include && !acfg->dedup_emit_mode);
                gboolean dedupable = mono_aot_can_dedup (method);

                // cfg->skip is vital for LLVM to work, can't just continue in this loop
                if (dedupable && strcmp (method->name, "wbarrier_conc") && dedup_collect) {
                        mono_dedup_cache_method (acfg, method);

                        // Don't compile inflated methods if we're in first phase of
                        // dedup
                        //
                        // In second phase, we emit methods that
                        // are dedupable. We also emit later methods
                        // which are referenced by them and added later. 
                        // For this reason, when in the dedup_include mode,
                        // we never set skip.
                        if (acfg->aot_opts.dedup)
                                cfg->skip = TRUE;
                }

                // Don't compile anything in this mode
                if (acfg->aot_opts.dedup_include && !acfg->dedup_emit_mode)
                        cfg->skip = TRUE;

                // Compile everything in this mode
                if (acfg->aot_opts.dedup_include && acfg->dedup_emit_mode)
                        cfg->skip = FALSE;

                /*if (dedup_collect) {*/
                        /*char *name = mono_aot_get_mangled_method_name (method);*/

                        /*if (ignore_cfg (cfg))*/
                                /*aot_printf (acfg, "Dedup Skipping %s\n", acfg->image->name, name);*/
                        /*else*/
                                /*aot_printf (acfg, "Dedup Keeping %s\n", acfg->image->name, name);*/

                        /*g_free (name);*/
                /*}*/
        }
}

static void
emit_code (MonoAotCompile *acfg)
{
        int oindex, i, prev_index;
        gboolean saved_unbox_info = FALSE; // See mono_aot_get_unbox_trampoline.
        char symbol [MAX_SYMBOL_SIZE];

        if (acfg->aot_opts.llvm_only)
                return;

#if defined(TARGET_POWERPC64)
        sprintf (symbol, ".Lgot_addr");
        emit_section_change (acfg, ".text", 0);
        emit_alignment (acfg, 8);
        emit_label (acfg, symbol);
        emit_pointer (acfg, acfg->got_symbol);
#endif

        /* 
         * This global symbol is used to compute the address of each method using the
         * code_offsets array. It is also used to compute the memory ranges occupied by
         * AOT code, so it must be equal to the address of the first emitted method.
         */
        emit_section_change (acfg, ".text", 0);
        emit_alignment_code (acfg, 8);
        emit_info_symbol (acfg, "jit_code_start", TRUE);

        /* 
         * Emit some padding so the local symbol for the first method doesn't have the
         * same address as 'methods'.
         */
        emit_padding (acfg, 16);

        for (oindex = 0; oindex < acfg->method_order->len; ++oindex) {
                MonoCompile *cfg;
                MonoMethod *method;

                i = GPOINTER_TO_UINT (g_ptr_array_index (acfg->method_order, oindex));

                cfg = acfg->cfgs [i];

                if (!cfg)
                        continue;

                method = cfg->orig_method;

                if (ignore_cfg (cfg))
                        continue;

                /* Emit unbox trampoline */
                if (mono_aot_mode_is_full (&acfg->aot_opts) && m_class_is_valuetype (cfg->orig_method->klass)) {
                        sprintf (symbol, "ut_%d", get_method_index (acfg, method));

                        emit_section_change (acfg, ".text", 0);

                        if (acfg->thumb_mixed && cfg->compile_llvm) {
                                emit_set_thumb_mode (acfg);
                                fprintf (acfg->fp, "\n.thumb_func\n");
                        }

                        emit_label (acfg, symbol);

                        arch_emit_unbox_trampoline (acfg, cfg, cfg->orig_method, cfg->asm_symbol);

                        if (acfg->thumb_mixed && cfg->compile_llvm)
                                emit_set_arm_mode (acfg);

                        if (!saved_unbox_info) {
                                char user_symbol [128];
                                GSList *unwind_ops;
                                sprintf (user_symbol, "%sunbox_trampoline_p", acfg->user_symbol_prefix);

                                emit_label (acfg, "ut_end");

                                unwind_ops = mono_unwind_get_cie_program ();
                                save_unwind_info (acfg, user_symbol, unwind_ops);
                                mono_free_unwind_info (unwind_ops);

                                /* Save the unbox trampoline size */
#ifdef TARGET_AMD64
                                // LLVM unbox trampolines vary in size, 6 or 9 bytes,
                                // due to the last instruction being 2 or 5 bytes.
                                // There is no need to describe interior bytes of instructions
                                // however, so state the size as if the last instruction is size 1.
                                emit_int32 (acfg, 5);
#else
                                emit_symbol_diff (acfg, "ut_end", symbol, 0);
#endif
                                saved_unbox_info = TRUE;
                        }
                }

                if (cfg->compile_llvm) {
                        acfg->stats.llvm_count ++;
                } else {
                        emit_method_code (acfg, cfg);
                }
        }

        emit_section_change (acfg, ".text", 0);
        emit_alignment_code (acfg, 8);
        emit_info_symbol (acfg, "jit_code_end", TRUE);

        /* To distinguish it from the next symbol */
        emit_padding (acfg, 4);

        /* 
         * Add .no_dead_strip directives for all LLVM methods to prevent the OSX linker
         * from optimizing them away, since it doesn't see that code_offsets references them.
         * JITted methods don't need this since they are referenced using assembler local
         * symbols.
         * FIXME: This is why write-symbols doesn't work on OSX ?
         */
        if (acfg->llvm && acfg->need_no_dead_strip) {
                fprintf (acfg->fp, "\n");
                for (i = 0; i < acfg->nmethods; ++i) {
                        if (acfg->cfgs [i] && acfg->cfgs [i]->compile_llvm)
                                fprintf (acfg->fp, ".no_dead_strip %s\n", acfg->cfgs [i]->asm_symbol);
                }
        }

        /*
         * To work around linker issues, we emit a table of branches, and disassemble them at runtime.
         * This is PIE code, and the linker can update it if needed.
         */
        
        sprintf (symbol, "method_addresses");
        emit_section_change (acfg, ".text", 1);
        emit_alignment_code (acfg, 8);
        emit_info_symbol (acfg, symbol, TRUE);
        if (acfg->aot_opts.write_symbols)
                emit_local_symbol (acfg, symbol, "method_addresses_end", TRUE);
        emit_unset_mode (acfg);
        if (acfg->need_no_dead_strip)
                fprintf (acfg->fp, "    .no_dead_strip %s\n", symbol);

        for (i = 0; i < acfg->nmethods; ++i) {
#ifdef MONO_ARCH_AOT_SUPPORTED
                int call_size;

                if (!ignore_cfg (acfg->cfgs [i])) {
                        arch_emit_direct_call (acfg, acfg->cfgs [i]->asm_symbol, FALSE, acfg->thumb_mixed && acfg->cfgs [i]->compile_llvm, NULL, &call_size);
                } else {
                        arch_emit_direct_call (acfg, symbol, FALSE, FALSE, NULL, &call_size);
                }
#endif
        }

        sprintf (symbol, "method_addresses_end");
        emit_label (acfg, symbol);
        emit_line (acfg);

        /* Emit a sorted table mapping methods to the index of their unbox trampolines */
        sprintf (symbol, "unbox_trampolines");
        emit_section_change (acfg, RODATA_SECT, 0);
        emit_alignment (acfg, 8);
        emit_info_symbol (acfg, symbol, FALSE);

        prev_index = -1;
        for (i = 0; i < acfg->nmethods; ++i) {
                MonoCompile *cfg;
                MonoMethod *method;
                int index;

                cfg = acfg->cfgs [i];
                if (ignore_cfg (cfg))
                        continue;

                method = cfg->orig_method;

                if (mono_aot_mode_is_full (&acfg->aot_opts) && m_class_is_valuetype (cfg->orig_method->klass)) {
                        index = get_method_index (acfg, method);

                        emit_int32 (acfg, index);
                        /* Make sure the table is sorted by index */
                        g_assert (index > prev_index);
                        prev_index = index;
                }
        }
        sprintf (symbol, "unbox_trampolines_end");
        emit_info_symbol (acfg, symbol, FALSE);
        emit_int32 (acfg, 0);

        /* Emit a separate table with the trampoline addresses/offsets */
        sprintf (symbol, "unbox_trampoline_addresses");
        emit_section_change (acfg, ".text", 0);
        emit_alignment_code (acfg, 8);
        emit_info_symbol (acfg, symbol, TRUE);

        for (i = 0; i < acfg->nmethods; ++i) {
                MonoCompile *cfg;
                MonoMethod *method;

                cfg = acfg->cfgs [i];
                if (ignore_cfg (cfg))
                        continue;

                method = cfg->orig_method;
                (void)method;

                if (mono_aot_mode_is_full (&acfg->aot_opts) && m_class_is_valuetype (cfg->orig_method->klass)) {
#ifdef MONO_ARCH_AOT_SUPPORTED
                        int call_size;

                        const int index = get_method_index (acfg, method);
                        sprintf (symbol, "ut_%d", index);

                        arch_emit_direct_call (acfg, symbol, FALSE, acfg->thumb_mixed && cfg->compile_llvm, NULL, &call_size);
#endif
                }
        }
        emit_int32 (acfg, 0);
}

static void
emit_info (MonoAotCompile *acfg)
{
        int oindex, i;
        gint32 *offsets;

        offsets = g_new0 (gint32, acfg->nmethods);

        for (oindex = 0; oindex < acfg->method_order->len; ++oindex) {
                i = GPOINTER_TO_UINT (g_ptr_array_index (acfg->method_order, oindex));

                if (acfg->cfgs [i]) {
                        emit_method_info (acfg, acfg->cfgs [i]);
                        offsets [i] = acfg->cfgs [i]->method_info_offset;
                } else {
                        offsets [i] = 0;
                }
        }

        acfg->stats.offsets_size += emit_offset_table (acfg, "method_info_offsets", MONO_AOT_TABLE_METHOD_INFO_OFFSETS, acfg->nmethods, 10, offsets);

        g_free (offsets);
}

#endif /* #if !defined(DISABLE_AOT) && !defined(DISABLE_JIT) */

#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
#define mix(a,b,c) { \
        a -= c;  a ^= rot(c, 4);  c += b; \
        b -= a;  b ^= rot(a, 6);  a += c; \
        c -= b;  c ^= rot(b, 8);  b += a; \
        a -= c;  a ^= rot(c,16);  c += b; \
        b -= a;  b ^= rot(a,19);  a += c; \
        c -= b;  c ^= rot(b, 4);  b += a; \
}
#define mono_final(a,b,c) { \
        c ^= b; c -= rot(b,14); \
        a ^= c; a -= rot(c,11); \
        b ^= a; b -= rot(a,25); \
        c ^= b; c -= rot(b,16); \
        a ^= c; a -= rot(c,4);  \
        b ^= a; b -= rot(a,14); \
        c ^= b; c -= rot(b,24); \
}

static guint
mono_aot_type_hash (MonoType *t1)
{
        guint hash = t1->type;

        hash |= t1->byref << 6; /* do not collide with t1->type values */
        switch (t1->type) {
        case MONO_TYPE_VALUETYPE:
        case MONO_TYPE_CLASS:
        case MONO_TYPE_SZARRAY:
                /* check if the distribution is good enough */
                return ((hash << 5) - hash) ^ mono_metadata_str_hash (m_class_get_name (t1->data.klass));
        case MONO_TYPE_PTR:
                return ((hash << 5) - hash) ^ mono_metadata_type_hash (t1->data.type);
        case MONO_TYPE_ARRAY:
                return ((hash << 5) - hash) ^ mono_metadata_type_hash (m_class_get_byval_arg (t1->data.array->eklass));
        case MONO_TYPE_GENERICINST:
                return ((hash << 5) - hash) ^ 0;
        default:
                return hash;
        }
}

/*
 * mono_aot_method_hash:
 *
 *   Return a hash code for methods which only depends on metadata.
 */
guint32
mono_aot_method_hash (MonoMethod *method)
{
        MonoMethodSignature *sig;
        MonoClass *klass;
        int i, hindex;
        int hashes_count;
        guint32 *hashes_start, *hashes;
        guint32 a, b, c;
        MonoGenericInst *class_ginst = NULL;
        MonoGenericInst *ginst = NULL;

        /* Similar to the hash in mono_method_get_imt_slot () */

        sig = mono_method_signature_internal (method);

        if (mono_class_is_ginst (method->klass))
                class_ginst = mono_class_get_generic_class (method->klass)->context.class_inst;
        if (method->is_inflated)
                ginst = ((MonoMethodInflated*)method)->context.method_inst;

        hashes_count = sig->param_count + 5 + (class_ginst ? class_ginst->type_argc : 0) + (ginst ? ginst->type_argc : 0);
        hashes_start = (guint32 *)g_malloc0 (hashes_count * sizeof (guint32));
        hashes = hashes_start;

        /* Some wrappers are assigned to random classes */
        if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK)
                klass = method->klass;
        else
                klass = mono_defaults.object_class;

        if (!method->wrapper_type) {
                char *full_name;

                if (mono_class_is_ginst (klass))
                        full_name = mono_type_full_name (m_class_get_byval_arg (mono_class_get_generic_class (klass)->container_class));
                else
                        full_name = mono_type_full_name (m_class_get_byval_arg (klass));

                hashes [0] = mono_metadata_str_hash (full_name);
                hashes [1] = 0;
                g_free (full_name);
        } else {
                hashes [0] = mono_metadata_str_hash (m_class_get_name (klass));
                hashes [1] = mono_metadata_str_hash (m_class_get_name_space (klass));
        }
        if (method->wrapper_type == MONO_WRAPPER_STFLD || method->wrapper_type == MONO_WRAPPER_LDFLD || method->wrapper_type == MONO_WRAPPER_LDFLDA)
                /* The method name includes a stringified pointer */
                hashes [2] = 0;
        else
                hashes [2] = mono_metadata_str_hash (method->name);
        hashes [3] = method->wrapper_type;
        hashes [4] = mono_aot_type_hash (sig->ret);
        hindex = 5;
        for (i = 0; i < sig->param_count; i++) {
                hashes [hindex ++] = mono_aot_type_hash (sig->params [i]);
        }
        if (class_ginst) {
                for (i = 0; i < class_ginst->type_argc; ++i)
                        hashes [hindex ++] = mono_aot_type_hash (class_ginst->type_argv [i]);
        }
        if (ginst) {
                for (i = 0; i < ginst->type_argc; ++i)
                        hashes [hindex ++] = mono_aot_type_hash (ginst->type_argv [i]);
        }               
        g_assert (hindex == hashes_count);

        /* Setup internal state */
        a = b = c = 0xdeadbeef + (((guint32)hashes_count)<<2);

        /* Handle most of the hashes */
        while (hashes_count > 3) {
                a += hashes [0];
                b += hashes [1];
                c += hashes [2];
                mix (a,b,c);
                hashes_count -= 3;
                hashes += 3;
        }

        /* Handle the last 3 hashes (all the case statements fall through) */
        switch (hashes_count) { 
        case 3 : c += hashes [2];
        case 2 : b += hashes [1];
        case 1 : a += hashes [0];
                mono_final (a,b,c);
        case 0: /* nothing left to add */
                break;
        }
        
        g_free (hashes_start);
        
        return c;
}
#undef rot
#undef mix
#undef mono_final

/*
 * mono_aot_get_array_helper_from_wrapper;
 *
 * Get the helper method in Array called by an array wrapper method.
 */
MonoMethod*
mono_aot_get_array_helper_from_wrapper (MonoMethod *method)
{
        MonoMethod *m;
        const char *prefix;
        MonoGenericContext ctx;
        MonoType *args [16];
        char *mname, *iname, *s, *s2, *helper_name = NULL;

        prefix = "System.Collections.Generic";
        s = g_strdup_printf ("%s", method->name + strlen (prefix) + 1);
        s2 = strstr (s, "`1.");
        g_assert (s2);
        s2 [0] = '\0';
        iname = s;
        mname = s2 + 3;

        //printf ("X: %s %s\n", iname, mname);

        if (!strcmp (iname, "IList"))
                helper_name = g_strdup_printf ("InternalArray__%s", mname);
        else
                helper_name = g_strdup_printf ("InternalArray__%s_%s", iname, mname);
        m = get_method_nofail (mono_defaults.array_class, helper_name, mono_method_signature_internal (method)->param_count, 0);
        g_assert (m);
        g_free (helper_name);
        g_free (s);

        if (m->is_generic) {
                ERROR_DECL (error);
                memset (&ctx, 0, sizeof (ctx));
                args [0] = m_class_get_byval_arg (m_class_get_element_class (method->klass));
                ctx.method_inst = mono_metadata_get_generic_inst (1, args);
                m = mono_class_inflate_generic_method_checked (m, &ctx, error);
                g_assert (is_ok (error)); /* FIXME don't swallow the error */
        }

        return m;
}

#if !defined(DISABLE_AOT) && !defined(DISABLE_JIT)

typedef struct HashEntry {
    guint32 key, value, index;
        struct HashEntry *next;
} HashEntry;

/*
 * emit_extra_methods:
 *
 * Emit methods which are not in the METHOD table, like wrappers.
 */
static void
emit_extra_methods (MonoAotCompile *acfg)
{
        int i, table_size, buf_size;
        guint8 *p, *buf;
        guint32 *info_offsets;
        guint32 hash;
        GPtrArray *table;
        HashEntry *entry, *new_entry;
        int nmethods, max_chain_length;
        int *chain_lengths;

        info_offsets = g_new0 (guint32, acfg->extra_methods->len);

        /* Emit method info */
        nmethods = 0;
        for (i = 0; i < acfg->extra_methods->len; ++i) {
                MonoMethod *method = (MonoMethod *)g_ptr_array_index (acfg->extra_methods, i);
                MonoCompile *cfg = (MonoCompile *)g_hash_table_lookup (acfg->method_to_cfg, method);

                if (ignore_cfg (cfg))
                        continue;

                buf_size = 10240;
                p = buf = (guint8 *)g_malloc (buf_size);

                nmethods ++;

                method = cfg->method_to_register;

                encode_method_ref (acfg, method, p, &p);

                g_assert ((p - buf) < buf_size);

                info_offsets [i] = add_to_blob (acfg, buf, p - buf);
                g_free (buf);
        }

        /*
         * Construct a chained hash table for mapping indexes in extra_method_info to
         * method indexes.
         */
        table_size = g_spaced_primes_closest ((int)(nmethods * 1.5));
        table = g_ptr_array_sized_new (table_size);
        for (i = 0; i < table_size; ++i)
                g_ptr_array_add (table, NULL);
        chain_lengths = g_new0 (int, table_size);
        max_chain_length = 0;
        for (i = 0; i < acfg->extra_methods->len; ++i) {
                MonoMethod *method = (MonoMethod *)g_ptr_array_index (acfg->extra_methods, i);
                MonoCompile *cfg = (MonoCompile *)g_hash_table_lookup (acfg->method_to_cfg, method);
                guint32 key, value;

                if (ignore_cfg (cfg))
                        continue;

                key = info_offsets [i];
                value = get_method_index (acfg, method);

                hash = mono_aot_method_hash (method) % table_size;
                //printf ("X: %s %x\n", mono_method_get_full_name (method), mono_aot_method_hash (method));

                chain_lengths [hash] ++;
                max_chain_length = MAX (max_chain_length, chain_lengths [hash]);

                new_entry = (HashEntry *)mono_mempool_alloc0 (acfg->mempool, sizeof (HashEntry));
                new_entry->key = key;
                new_entry->value = value;

                entry = (HashEntry *)g_ptr_array_index (table, hash);
                if (entry == NULL) {
                        new_entry->index = hash;
                        g_ptr_array_index (table, hash) = new_entry;
                } else {
                        while (entry->next)
                                entry = entry->next;
                        
                        entry->next = new_entry;
                        new_entry->index = table->len;
                        g_ptr_array_add (table, new_entry);
                }
        }
        g_free (chain_lengths);

        //printf ("MAX: %d\n", max_chain_length);

        buf_size = table->len * 12 + 4;
        p = buf = (guint8 *)g_malloc (buf_size);
        encode_int (table_size, p, &p);

        for (i = 0; i < table->len; ++i) {
                HashEntry *entry = (HashEntry *)g_ptr_array_index (table, i);

                if (entry == NULL) {
                        encode_int (0, p, &p);
                        encode_int (0, p, &p);
                        encode_int (0, p, &p);
                } else {
                        //g_assert (entry->key > 0);
                        encode_int (entry->key, p, &p);
                        encode_int (entry->value, p, &p);
                        if (entry->next)
                                encode_int (entry->next->index, p, &p);
                        else
                                encode_int (0, p, &p);
                }
        }
        g_assert (p - buf <= buf_size);

        /* Emit the table */
        emit_aot_data (acfg, MONO_AOT_TABLE_EXTRA_METHOD_TABLE, "extra_method_table", buf, p - buf);

        g_free (buf);

        /* 
         * Emit a table reverse mapping method indexes to their index in extra_method_info.
         * This is used by mono_aot_find_jit_info ().
         */
        buf_size = acfg->extra_methods->len * 8 + 4;
        p = buf = (guint8 *)g_malloc (buf_size);
        encode_int (acfg->extra_methods->len, p, &p);
        for (i = 0; i < acfg->extra_methods->len; ++i) {
                MonoMethod *method = (MonoMethod *)g_ptr_array_index (acfg->extra_methods, i);

                encode_int (get_method_index (acfg, method), p, &p);
                encode_int (info_offsets [i], p, &p);
        }
        emit_aot_data (acfg, MONO_AOT_TABLE_EXTRA_METHOD_INFO_OFFSETS, "extra_method_info_offsets", buf, p - buf);

        g_free (buf);
        g_free (info_offsets);
        g_ptr_array_free (table, TRUE);
}       

static void
generate_aotid (guint8* aotid)
{
        gpointer rand_handle;
        ERROR_DECL (error);

        mono_rand_open ();
        rand_handle = mono_rand_init (NULL, 0);

        mono_rand_try_get_bytes (&rand_handle, aotid, 16, error);
        mono_error_assert_ok (error);

        mono_rand_close (rand_handle);
}

static void
emit_exception_info (MonoAotCompile *acfg)
{
        int i;
        gint32 *offsets;
        SeqPointData sp_data;
        gboolean seq_points_to_file = FALSE;

        offsets = g_new0 (gint32, acfg->nmethods);
        for (i = 0; i < acfg->nmethods; ++i) {
                if (acfg->cfgs [i]) {
                        MonoCompile *cfg = acfg->cfgs [i];

                        // By design aot-runtime decode_exception_debug_info is not able to load sequence point debug data from a file.
                        // As it is not possible to load debug data from a file its is also not possible to store it in a file.
                        gboolean method_seq_points_to_file = acfg->aot_opts.gen_msym_dir &&
                                cfg->gen_seq_points && !cfg->gen_sdb_seq_points;
                        gboolean method_seq_points_to_binary = cfg->gen_seq_points && !method_seq_points_to_file;
                        
                        emit_exception_debug_info (acfg, cfg, method_seq_points_to_binary);
                        offsets [i] = cfg->ex_info_offset;

                        if (method_seq_points_to_file) {
                                if (!seq_points_to_file) {
                                        mono_seq_point_data_init (&sp_data, acfg->nmethods);
                                        seq_points_to_file = TRUE;
                                }
                                mono_seq_point_data_add (&sp_data, cfg->method->token, cfg->method_index, cfg->seq_point_info);
                        }
                } else {
                        offsets [i] = 0;
                }
        }

        if (seq_points_to_file) {
                char *aotid = mono_guid_to_string_minimal (acfg->image->aotid);
                char *dir = g_build_filename (acfg->aot_opts.gen_msym_dir_path, aotid, (const char*)NULL);
                char *image_basename = g_path_get_basename (acfg->image->name);
                char *aot_file = g_strdup_printf("%s%s", image_basename, SEQ_POINT_AOT_EXT);
                char *aot_file_path = g_build_filename (dir, aot_file, (const char*)NULL);

                if (g_ensure_directory_exists (aot_file_path) == FALSE) {
                        fprintf (stderr, "AOT : failed to create msym directory: %s\n", aot_file_path);
                        exit (1);
                }

                mono_seq_point_data_write (&sp_data, aot_file_path);
                mono_seq_point_data_free (&sp_data);

                g_free (aotid);
                g_free (dir);
                g_free (image_basename);
                g_free (aot_file);
                g_free (aot_file_path);
        }

        acfg->stats.offsets_size += emit_offset_table (acfg, "ex_info_offsets", MONO_AOT_TABLE_EX_INFO_OFFSETS, acfg->nmethods, 10, offsets);
        g_free (offsets);
}

static void
emit_unwind_info (MonoAotCompile *acfg)
{
        int i;
        char symbol [128];

        if (acfg->aot_opts.llvm_only) {
                g_assert (acfg->unwind_ops->len == 0);
                return;
        }

        /* 
         * The unwind info contains a lot of duplicates so we emit each unique
         * entry once, and only store the offset from the start of the table in the
         * exception info.
         */

        sprintf (symbol, "unwind_info");
        emit_section_change (acfg, RODATA_SECT, 1);
        emit_alignment (acfg, 8);
        emit_info_symbol (acfg, symbol, TRUE);

        for (i = 0; i < acfg->unwind_ops->len; ++i) {
                guint32 index = GPOINTER_TO_UINT (g_ptr_array_index (acfg->unwind_ops, i));
                guint8 *unwind_info;
                guint32 unwind_info_len;
                guint8 buf [16];
                guint8 *p;

                unwind_info = mono_get_cached_unwind_info (index, &unwind_info_len);

                p = buf;
                encode_value (unwind_info_len, p, &p);
                emit_bytes (acfg, buf, p - buf);
                emit_bytes (acfg, unwind_info, unwind_info_len);

                acfg->stats.unwind_info_size += (p - buf) + unwind_info_len;
        }
}

static void
emit_class_info (MonoAotCompile *acfg)
{
        int i;
        gint32 *offsets;

        offsets = g_new0 (gint32, acfg->image->tables [MONO_TABLE_TYPEDEF].rows);
        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPEDEF].rows; ++i)
                offsets [i] = emit_klass_info (acfg, MONO_TOKEN_TYPE_DEF | (i + 1));

        acfg->stats.offsets_size += emit_offset_table (acfg, "class_info_offsets", MONO_AOT_TABLE_CLASS_INFO_OFFSETS, acfg->image->tables [MONO_TABLE_TYPEDEF].rows, 10, offsets);
        g_free (offsets);
}

typedef struct ClassNameTableEntry {
        guint32 token, index;
        struct ClassNameTableEntry *next;
} ClassNameTableEntry;

static void
emit_class_name_table (MonoAotCompile *acfg)
{
        int i, table_size, buf_size;
        guint32 token, hash;
        MonoClass *klass;
        GPtrArray *table;
        char *full_name;
        guint8 *buf, *p;
        ClassNameTableEntry *entry, *new_entry;

        /*
         * Construct a chained hash table for mapping class names to typedef tokens.
         */
        table_size = g_spaced_primes_closest ((int)(acfg->image->tables [MONO_TABLE_TYPEDEF].rows * 1.5));
        table = g_ptr_array_sized_new (table_size);
        for (i = 0; i < table_size; ++i)
                g_ptr_array_add (table, NULL);
        for (i = 0; i < acfg->image->tables [MONO_TABLE_TYPEDEF].rows; ++i) {
                ERROR_DECL (error);
                token = MONO_TOKEN_TYPE_DEF | (i + 1);
                klass = mono_class_get_checked (acfg->image, token, error);
                if (!klass) {
                        mono_error_cleanup (error);
                        continue;
                }
                full_name = mono_type_get_name_full (m_class_get_byval_arg (klass), MONO_TYPE_NAME_FORMAT_FULL_NAME);
                hash = mono_metadata_str_hash (full_name) % table_size;
                g_free (full_name);

                /* FIXME: Allocate from the mempool */
                new_entry = g_new0 (ClassNameTableEntry, 1);
                new_entry->token = token;

                entry = (ClassNameTableEntry *)g_ptr_array_index (table, hash);
                if (entry == NULL) {
                        new_entry->index = hash;
                        g_ptr_array_index (table, hash) = new_entry;
                } else {
                        while (entry->next)
                                entry = entry->next;
                        
                        entry->next = new_entry;
                        new_entry->index = table->len;
                        g_ptr_array_add (table, new_entry);
                }
        }

        /* Emit the table */
        buf_size = table->len * 4 + 4;
        p = buf = (guint8 *)g_malloc0 (buf_size);

        /* FIXME: Optimize memory usage */
        g_assert (table_size < 65000);
        encode_int16 (table_size, p, &p);
        g_assert (table->len < 65000);
        for (i = 0; i < table->len; ++i) {
                ClassNameTableEntry *entry = (ClassNameTableEntry *)g_ptr_array_index (table, i);

                if (entry == NULL) {
                        encode_int16 (0, p, &p);
                        encode_int16 (0, p, &p);
                } else {
                        encode_int16 (mono_metadata_token_index (entry->token), p, &p);
                        if (entry->next)
                                encode_int16 (entry->next->index, p, &p);
                        else
                                encode_int16 (0, p, &p);
                }
                g_free (entry);
        }
        g_assert (p - buf <= buf_size);
        g_ptr_array_free (table, TRUE);

        emit_aot_data (acfg, MONO_AOT_TABLE_CLASS_NAME, "class_name_table", buf, p - buf);

        g_free (buf);
}

static void
emit_image_table (MonoAotCompile *acfg)
{
        int i, buf_size;
        guint8 *buf, *p;

        /*
         * The image table is small but referenced in a lot of places.
         * So we emit it at once, and reference its elements by an index.
         */
        buf_size = acfg->image_table->len * 28 + 4;
        for (i = 0; i < acfg->image_table->len; i++) {
                MonoImage *image = (MonoImage*)g_ptr_array_index (acfg->image_table, i);
                MonoAssemblyName *aname = &image->assembly->aname;

                buf_size += strlen (image->assembly_name) + strlen (image->guid) + (aname->culture ? strlen (aname->culture) : 1) + strlen ((char*)aname->public_key_token) + 4;
        }

        buf = p = (guint8 *)g_malloc0 (buf_size);
        encode_int (acfg->image_table->len, p, &p);
        for (i = 0; i < acfg->image_table->len; i++) {
                MonoImage *image = (MonoImage*)g_ptr_array_index (acfg->image_table, i);
                MonoAssemblyName *aname = &image->assembly->aname;

                /* FIXME: Support multi-module assemblies */
                g_assert (image->assembly->image == image);

                encode_string (image->assembly_name, p, &p);
                encode_string (image->guid, p, &p);
                encode_string (aname->culture ? aname->culture : "", p, &p);
                encode_string ((const char*)aname->public_key_token, p, &p);

                while (GPOINTER_TO_UINT (p) % 8 != 0)
                        p ++;

                encode_int (aname->flags, p, &p);
                encode_int (aname->major, p, &p);
                encode_int (aname->minor, p, &p);
                encode_int (aname->build, p, &p);
                encode_int (aname->revision, p, &p);
        }
        g_assert (p - buf <= buf_size);

        emit_aot_data (acfg, MONO_AOT_TABLE_IMAGE_TABLE, "image_table", buf, p - buf);

        g_free (buf);
}

static void
emit_weak_field_indexes (MonoAotCompile *acfg)
{
        GHashTable *indexes;
        GHashTableIter iter;
        gpointer key, value;
        int buf_size;
        guint8 *buf, *p;

        /* Emit a table of weak field indexes, since computing these at runtime is expensive */
        mono_assembly_init_weak_fields (acfg->image);
        indexes = acfg->image->weak_field_indexes;
        g_assert (indexes);

        buf_size = (g_hash_table_size (indexes) + 1) * 4;
        buf = p = (guint8 *)g_malloc0 (buf_size);

        encode_int (g_hash_table_size (indexes), p, &p);
        g_hash_table_iter_init (&iter, indexes);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
                guint32 index = GPOINTER_TO_UINT (key);
                encode_int (index, p, &p);
        }
        g_assert (p - buf <= buf_size);

        emit_aot_data (acfg, MONO_AOT_TABLE_WEAK_FIELD_INDEXES, "weak_field_indexes", buf, p - buf);

        g_free (buf);
}

static void
emit_got_info (MonoAotCompile *acfg, gboolean llvm)
{
        int i, first_plt_got_patch = 0, buf_size;
        guint8 *p, *buf;
        guint32 *got_info_offsets;
        GotInfo *info = llvm ? &acfg->llvm_got_info : &acfg->got_info;

        /* Add the patches needed by the PLT to the GOT */
        if (!llvm) {
                acfg->plt_got_offset_base = acfg->got_offset;
                first_plt_got_patch = info->got_patches->len;
                for (i = 1; i < acfg->plt_offset; ++i) {
                        MonoPltEntry *plt_entry = (MonoPltEntry *)g_hash_table_lookup (acfg->plt_offset_to_entry, GUINT_TO_POINTER (i));

                        g_ptr_array_add (info->got_patches, plt_entry->ji);

                        acfg->stats.got_slot_types [plt_entry->ji->type] ++;
                }

                acfg->got_offset += acfg->plt_offset;
        }

        /**
         * FIXME: 
         * - optimize offsets table.
         * - reduce number of exported symbols.
         * - emit info for a klass only once.
         * - determine when a method uses a GOT slot which is guaranteed to be already 
         *   initialized.
         * - clean up and document the code.
         * - use String.Empty in class libs.
         */

        /* Encode info required to decode shared GOT entries */
        buf_size = info->got_patches->len * 128;
        p = buf = (guint8 *)mono_mempool_alloc (acfg->mempool, buf_size);
        got_info_offsets = (guint32 *)mono_mempool_alloc (acfg->mempool, info->got_patches->len * sizeof (guint32));
        if (!llvm) {
                acfg->plt_got_info_offsets = (guint32 *)mono_mempool_alloc (acfg->mempool, acfg->plt_offset * sizeof (guint32));
                /* Unused */
                if (acfg->plt_offset)
                        acfg->plt_got_info_offsets [0] = 0;
        }
        for (i = 0; i < info->got_patches->len; ++i) {
                MonoJumpInfo *ji = (MonoJumpInfo *)g_ptr_array_index (info->got_patches, i);
                guint8 *p2;

                p = buf;

                encode_value (ji->type, p, &p);
                p2 = p;
                encode_patch (acfg, ji, p, &p);
                acfg->stats.got_slot_info_sizes [ji->type] += p - p2;
                g_assert (p - buf <= buf_size);
                got_info_offsets [i] = add_to_blob (acfg, buf, p - buf);

                if (!llvm && i >= first_plt_got_patch)
                        acfg->plt_got_info_offsets [i - first_plt_got_patch + 1] = got_info_offsets [i];
                acfg->stats.got_info_size += p - buf;
        }

        /* Emit got_info_offsets table */

        /* No need to emit offsets for the got plt entries, the plt embeds them directly */
        acfg->stats.offsets_size += emit_offset_table (acfg, llvm ? "llvm_got_info_offsets" : "got_info_offsets", llvm ? MONO_AOT_TABLE_LLVM_GOT_INFO_OFFSETS : MONO_AOT_TABLE_GOT_INFO_OFFSETS, llvm ? acfg->llvm_got_offset : first_plt_got_patch, 10, (gint32*)got_info_offsets);
}

static void
emit_got (MonoAotCompile *acfg)
{
        char symbol [MAX_SYMBOL_SIZE];

        if (acfg->aot_opts.llvm_only)
                return;

        /* Don't make GOT global so accesses to it don't need relocations */
        sprintf (symbol, "%s", acfg->got_symbol);

#ifdef TARGET_MACH
        emit_unset_mode (acfg);
        fprintf (acfg->fp, ".section __DATA, __bss\n");
        emit_alignment (acfg, 8);
        if (acfg->llvm)
                emit_info_symbol (acfg, "jit_got", FALSE);
        fprintf (acfg->fp, ".lcomm %s, %d\n", acfg->got_symbol, (int)(acfg->got_offset * sizeof (target_mgreg_t)));
#else
        emit_section_change (acfg, ".bss", 0);
        emit_alignment (acfg, 8);
        if (acfg->aot_opts.write_symbols)
                emit_local_symbol (acfg, symbol, "got_end", FALSE);
        emit_label (acfg, symbol);
        if (acfg->llvm)
                emit_info_symbol (acfg, "jit_got", FALSE);
        if (acfg->got_offset > 0)
                emit_zero_bytes (acfg, (int)(acfg->got_offset * sizeof (target_mgreg_t)));
#endif

        sprintf (symbol, "got_end");
        emit_label (acfg, symbol);
}

typedef struct GlobalsTableEntry {
        guint32 value, index;
        struct GlobalsTableEntry *next;
} GlobalsTableEntry;

#ifdef TARGET_WIN32_MSVC
#define DLL_ENTRY_POINT "DllMain"

static void
emit_library_info (MonoAotCompile *acfg)
{
        // Only include for shared libraries linked directly from generated object.
        if (link_shared_library (acfg)) {
                char    *name = NULL;
                char    symbol [MAX_SYMBOL_SIZE];

                // Ask linker to export all global symbols.
                emit_section_change (acfg, ".drectve", 0);
                for (guint i = 0; i < acfg->globals->len; ++i) {
                        name = (char *)g_ptr_array_index (acfg->globals, i);
                        g_assert (name != NULL);
                        sprintf_s (symbol, MAX_SYMBOL_SIZE, " /EXPORT:%s", name);
                        emit_string (acfg, symbol);
                }

                // Emit DLLMain function, needed by MSVC linker for DLL's.
                // NOTE, DllMain should not go into exports above.
                emit_section_change (acfg, ".text", 0);
                emit_global (acfg, DLL_ENTRY_POINT, TRUE);
                emit_label (acfg, DLL_ENTRY_POINT);

                // Simple implementation of DLLMain, just returning TRUE.
                // For more information about DLLMain: https://msdn.microsoft.com/en-us/library/windows/desktop/ms682583(v=vs.85).aspx
                fprintf (acfg->fp, "movl $1, %%eax\n");
                fprintf (acfg->fp, "ret\n");

                // Inform linker about our dll entry function.
                emit_section_change (acfg, ".drectve", 0);
                emit_string (acfg, "/ENTRY:" DLL_ENTRY_POINT);
                return;
        }
}

#else

static inline void
emit_library_info (MonoAotCompile *acfg)
{
        return;
}
#endif

static void
emit_globals (MonoAotCompile *acfg)
{
        int i, table_size;
        guint32 hash;
        GPtrArray *table;
        char symbol [1024];
        GlobalsTableEntry *entry, *new_entry;

        if (!acfg->aot_opts.static_link)
                return;

        if (acfg->aot_opts.llvm_only) {
                g_assert (acfg->globals->len == 0);
                return;
        }

        /* 
         * When static linking, we emit a table containing our globals.
         */

        /*
         * Construct a chained hash table for mapping global names to their index in
         * the globals table.
         */
        table_size = g_spaced_primes_closest ((int)(acfg->globals->len * 1.5));
        table = g_ptr_array_sized_new (table_size);
        for (i = 0; i < table_size; ++i)
                g_ptr_array_add (table, NULL);
        for (i = 0; i < acfg->globals->len; ++i) {
                char *name = (char *)g_ptr_array_index (acfg->globals, i);

                hash = mono_metadata_str_hash (name) % table_size;

                /* FIXME: Allocate from the mempool */
                new_entry = g_new0 (GlobalsTableEntry, 1);
                new_entry->value = i;

                entry = (GlobalsTableEntry *)g_ptr_array_index (table, hash);
                if (entry == NULL) {
                        new_entry->index = hash;
                        g_ptr_array_index (table, hash) = new_entry;
                } else {
                        while (entry->next)
                                entry = entry->next;
                        
                        entry->next = new_entry;
                        new_entry->index = table->len;
                        g_ptr_array_add (table, new_entry);
                }
        }

        /* Emit the table */
        sprintf (symbol, ".Lglobals_hash");
        emit_section_change (acfg, RODATA_SECT, 0);
        emit_alignment (acfg, 8);
        emit_label (acfg, symbol);

        /* FIXME: Optimize memory usage */
        g_assert (table_size < 65000);
        emit_int16 (acfg, table_size);
        for (i = 0; i < table->len; ++i) {
                GlobalsTableEntry *entry = (GlobalsTableEntry *)g_ptr_array_index (table, i);

                if (entry == NULL) {
                        emit_int16 (acfg, 0);
                        emit_int16 (acfg, 0);
                } else {
                        emit_int16 (acfg, entry->value + 1);
                        if (entry->next)
                                emit_int16 (acfg, entry->next->index);
                        else
                                emit_int16 (acfg, 0);
                }
        }

        /* Emit the names */
        for (i = 0; i < acfg->globals->len; ++i) {
                char *name = (char *)g_ptr_array_index (acfg->globals, i);

                sprintf (symbol, "name_%d", i);
                emit_section_change (acfg, RODATA_SECT, 1);
#ifdef TARGET_MACH
                emit_alignment (acfg, 4);
#endif
                emit_label (acfg, symbol);
                emit_string (acfg, name);
        }

        /* Emit the globals table */
        sprintf (symbol, "globals");
        emit_section_change (acfg, ".data", 0);
        /* This is not a global, since it is accessed by the init function */
        emit_alignment (acfg, 8);
        emit_info_symbol (acfg, symbol, FALSE);

        sprintf (symbol, "%sglobals_hash", acfg->temp_prefix);
        emit_pointer (acfg, symbol);

        for (i = 0; i < acfg->globals->len; ++i) {
                char *name = (char *)g_ptr_array_index (acfg->globals, i);

                sprintf (symbol, "name_%d", i);
                emit_pointer (acfg, symbol);

                g_assert (strlen (name) < sizeof (symbol));
                sprintf (symbol, "%s", name);
                emit_pointer (acfg, symbol);
        }
        /* Null terminate the table */
        emit_int32 (acfg, 0);
        emit_int32 (acfg, 0);
}

static void
emit_mem_end (MonoAotCompile *acfg)
{
        char symbol [128];

        if (acfg->aot_opts.llvm_only)
                return;

        sprintf (symbol, "mem_end");
        emit_section_change (acfg, ".text", 1);
        emit_alignment_code (acfg, 8);
        emit_label (acfg, symbol);
}

static void
init_aot_file_info (MonoAotCompile *acfg, MonoAotFileInfo *info)
{
        int i;

        info->version = MONO_AOT_FILE_VERSION;
        info->plt_got_offset_base = acfg->plt_got_offset_base;
        info->got_size = acfg->got_offset * sizeof (target_mgreg_t);
        info->plt_size = acfg->plt_offset;
        info->nmethods = acfg->nmethods;
        info->nextra_methods = acfg->nextra_methods;
        info->flags = acfg->flags;
        info->opts = acfg->opts;
        info->simd_opts = acfg->simd_opts;
        info->gc_name_index = acfg->gc_name_offset;
        info->datafile_size = acfg->datafile_offset;
        for (i = 0; i < MONO_AOT_TABLE_NUM; ++i)
                info->table_offsets [i] = acfg->table_offsets [i];
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                info->num_trampolines [i] = acfg->num_trampolines [i];
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                info->trampoline_got_offset_base [i] = acfg->trampoline_got_offset_base [i];
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                info->trampoline_size [i] = acfg->trampoline_size [i];
        info->num_rgctx_fetch_trampolines = acfg->aot_opts.nrgctx_fetch_trampolines;

        int card_table_shift_bits = 0;
        target_mgreg_t card_table_mask = 0;

        mono_gc_get_target_card_table (&card_table_shift_bits, &card_table_mask);

        /*
         * Sanity checking variables used to make sure the host and target
         * environment matches when cross compiling.
         */
        info->double_align = MONO_ABI_ALIGNOF (double);
        info->long_align = MONO_ABI_ALIGNOF (gint64);
        info->generic_tramp_num = MONO_TRAMPOLINE_NUM;
        info->card_table_shift_bits = card_table_shift_bits;
        info->card_table_mask = card_table_mask;

        info->tramp_page_size = acfg->tramp_page_size;
        info->nshared_got_entries = acfg->nshared_got_entries;
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                info->tramp_page_code_offsets [i] = acfg->tramp_page_code_offsets [i];

        memcpy(&info->aotid, acfg->image->aotid, 16);
}

static void
emit_aot_file_info (MonoAotCompile *acfg, MonoAotFileInfo *info)
{
        char symbol [MAX_SYMBOL_SIZE];
        int i, sindex;
        const char **symbols;

        symbols = g_new0 (const char *, MONO_AOT_FILE_INFO_NUM_SYMBOLS);
        sindex = 0;
        symbols [sindex ++] = acfg->got_symbol;
        if (acfg->llvm) {
                symbols [sindex ++] = g_strdup_printf ("%s%s", acfg->user_symbol_prefix, acfg->llvm_got_symbol);
                symbols [sindex ++] = acfg->llvm_eh_frame_symbol;
        } else {
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
        }
        /* llvm_get_method */
        symbols [sindex ++] = NULL;
        /* llvm_get_unbox_tramp */
        symbols [sindex ++] = NULL;
        if (!acfg->aot_opts.llvm_only) {
                symbols [sindex ++] = "jit_code_start";
                symbols [sindex ++] = "jit_code_end";
                symbols [sindex ++] = "method_addresses";
        } else {
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
        }
        symbols [sindex ++] = NULL;
        symbols [sindex ++] = NULL;

        if (acfg->data_outfile) {
                for (i = 0; i < MONO_AOT_TABLE_NUM; ++i)
                        symbols [sindex ++] = NULL;
        } else {
                symbols [sindex ++] = "blob";
                symbols [sindex ++] = "class_name_table";
                symbols [sindex ++] = "class_info_offsets";
                symbols [sindex ++] = "method_info_offsets";
                symbols [sindex ++] = "ex_info_offsets";
                symbols [sindex ++] = "extra_method_info_offsets";
                symbols [sindex ++] = "extra_method_table";
                symbols [sindex ++] = "got_info_offsets";
                if (acfg->llvm)
                        symbols [sindex ++] = "llvm_got_info_offsets";
                else
                        symbols [sindex ++] = NULL;
                symbols [sindex ++] = "image_table";
                symbols [sindex ++] = "weak_field_indexes";
        }

        symbols [sindex ++] = "mem_end";
        symbols [sindex ++] = "assembly_guid";
        symbols [sindex ++] = "runtime_version";
        if (acfg->num_trampoline_got_entries) {
                symbols [sindex ++] = "specific_trampolines";
                symbols [sindex ++] = "static_rgctx_trampolines";
                symbols [sindex ++] = "imt_trampolines";
                symbols [sindex ++] = "gsharedvt_arg_trampolines";
                symbols [sindex ++] = "ftnptr_arg_trampolines";
                symbols [sindex ++] = "unbox_arbitrary_trampolines";
        } else {
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
        }
        if (acfg->aot_opts.static_link) {
                symbols [sindex ++] = "globals";
        } else {
                symbols [sindex ++] = NULL;
        }
        symbols [sindex ++] = "assembly_name";
        symbols [sindex ++] = "plt";
        symbols [sindex ++] = "plt_end";
        symbols [sindex ++] = "unwind_info";
        if (!acfg->aot_opts.llvm_only) {
                symbols [sindex ++] = "unbox_trampolines";
                symbols [sindex ++] = "unbox_trampolines_end";
                symbols [sindex ++] = "unbox_trampoline_addresses";
        } else {
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
                symbols [sindex ++] = NULL;
        }

        g_assert (sindex == MONO_AOT_FILE_INFO_NUM_SYMBOLS);

        sprintf (symbol, "%smono_aot_file_info", acfg->user_symbol_prefix);
        emit_section_change (acfg, ".data", 0);
        emit_alignment (acfg, 8);
        emit_label (acfg, symbol);
        if (!acfg->aot_opts.static_link)
                emit_global (acfg, symbol, FALSE);

        /* The data emitted here must match MonoAotFileInfo. */

        emit_int32 (acfg, info->version);
        emit_int32 (acfg, info->dummy);

        /* 
         * We emit pointers to our data structures instead of emitting global symbols which
         * point to them, to reduce the number of globals, and because using globals leads to
         * various problems (i.e. arm/thumb).
         */
        for (i = 0; i < MONO_AOT_FILE_INFO_NUM_SYMBOLS; ++i)
                emit_pointer (acfg, symbols [i]);

        emit_int32 (acfg, info->plt_got_offset_base);
        emit_int32 (acfg, info->got_size);
        emit_int32 (acfg, info->plt_size);
        emit_int32 (acfg, info->nmethods);
        emit_int32 (acfg, info->nextra_methods);
        emit_int32 (acfg, info->flags);
        emit_int32 (acfg, info->opts);
        emit_int32 (acfg, info->simd_opts);
        emit_int32 (acfg, info->gc_name_index);
        emit_int32 (acfg, info->num_rgctx_fetch_trampolines);
        emit_int32 (acfg, info->double_align);
        emit_int32 (acfg, info->long_align);
        emit_int32 (acfg, info->generic_tramp_num);
        emit_int32 (acfg, info->card_table_shift_bits);
        emit_int32 (acfg, info->card_table_mask);
        emit_int32 (acfg, info->tramp_page_size);
        emit_int32 (acfg, info->nshared_got_entries);
        emit_int32 (acfg, info->datafile_size);
        emit_int32 (acfg, 0);
        emit_int32 (acfg, 0);

        for (i = 0; i < MONO_AOT_TABLE_NUM; ++i)
                emit_int32 (acfg, info->table_offsets [i]);
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                emit_int32 (acfg, info->num_trampolines [i]);
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                emit_int32 (acfg, info->trampoline_got_offset_base [i]);
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                emit_int32 (acfg, info->trampoline_size [i]);
        for (i = 0; i < MONO_AOT_TRAMP_NUM; ++i)
                emit_int32 (acfg, info->tramp_page_code_offsets [i]);

        emit_bytes (acfg, info->aotid, 16);

        if (acfg->aot_opts.static_link) {
                emit_global_inner (acfg, acfg->static_linking_symbol, FALSE);
                emit_alignment (acfg, sizeof (target_mgreg_t));
                emit_label (acfg, acfg->static_linking_symbol);
                emit_pointer_2 (acfg, acfg->user_symbol_prefix, "mono_aot_file_info");
        }
}

/*
 * Emit a structure containing all the information not stored elsewhere.
 */
static void
emit_file_info (MonoAotCompile *acfg)
{
        char *build_info;
        MonoAotFileInfo *info;

        if (acfg->aot_opts.bind_to_runtime_version) {
                build_info = mono_get_runtime_build_info ();
                emit_string_symbol (acfg, "runtime_version", build_info);
                g_free (build_info);
        } else {
                emit_string_symbol (acfg, "runtime_version", "");
        }

        emit_string_symbol (acfg, "assembly_guid" , acfg->image->guid);

        /* Emit a string holding the assembly name */
        emit_string_symbol (acfg, "assembly_name", acfg->image->assembly->aname.name);

        info = g_new0 (MonoAotFileInfo, 1);
        init_aot_file_info (acfg, info);

        if (acfg->aot_opts.static_link) {
                char symbol [MAX_SYMBOL_SIZE];
                char *p;

                /*
                 * Emit a global symbol which can be passed by an embedding app to
                 * mono_aot_register_module (). The symbol points to a pointer to the the file info
                 * structure.
                 */
                sprintf (symbol, "%smono_aot_module_%s_info", acfg->user_symbol_prefix, acfg->image->assembly->aname.name);

                /* Get rid of characters which cannot occur in symbols */
                p = symbol;
                for (p = symbol; *p; ++p) {
                        if (!(isalnum (*p) || *p == '_'))
                                *p = '_';
                }
                acfg->static_linking_symbol = g_strdup (symbol);
        }

        if (acfg->llvm)
                mono_llvm_emit_aot_file_info (info, acfg->has_jitted_code);
        else
                emit_aot_file_info (acfg, info);
}

static void
emit_blob (MonoAotCompile *acfg)
{
        acfg->blob_closed = TRUE;

        emit_aot_data (acfg, MONO_AOT_TABLE_BLOB, "blob", (guint8*)acfg->blob.data, acfg->blob.index);
}

static void
emit_objc_selectors (MonoAotCompile *acfg)
{
        int i;
        char symbol [128];

        if (!acfg->objc_selectors || acfg->objc_selectors->len == 0)
                return;

        /*
         * From
         * cat > foo.m << EOF
         * void *ret ()
         * {
         * return @selector(print:);
         * }
         * EOF
         */

        mono_img_writer_emit_unset_mode (acfg->w);
        g_assert (acfg->fp);
        fprintf (acfg->fp, ".section    __DATA,__objc_selrefs,literal_pointers,no_dead_strip\n");
        fprintf (acfg->fp, ".align      3\n");
        for (i = 0; i < acfg->objc_selectors->len; ++i) {
                sprintf (symbol, "L_OBJC_SELECTOR_REFERENCES_%d", i);
                emit_label (acfg, symbol);
                sprintf (symbol, "L_OBJC_METH_VAR_NAME_%d", i);
                emit_pointer (acfg, symbol);

        }
        fprintf (acfg->fp, ".section    __TEXT,__cstring,cstring_literals\n");
        for (i = 0; i < acfg->objc_selectors->len; ++i) {
                fprintf (acfg->fp, "L_OBJC_METH_VAR_NAME_%d:\n", i);
                fprintf (acfg->fp, ".asciz \"%s\"\n", (char*)g_ptr_array_index (acfg->objc_selectors, i));
        }

        fprintf (acfg->fp, ".section    __DATA,__objc_imageinfo,regular,no_dead_strip\n");
        fprintf (acfg->fp, ".align      3\n");
        fprintf (acfg->fp, "L_OBJC_IMAGE_INFO:\n");
        fprintf (acfg->fp, ".long       0\n");
        fprintf (acfg->fp, ".long       16\n");
}

static void
emit_dwarf_info (MonoAotCompile *acfg)
{
#ifdef EMIT_DWARF_INFO
        int i;
        char symbol2 [128];

        /* DIEs for methods */
        for (i = 0; i < acfg->nmethods; ++i) {
                MonoCompile *cfg = acfg->cfgs [i];

                if (ignore_cfg (cfg))
                        continue;

                // FIXME: LLVM doesn't define .Lme_...
                if (cfg->compile_llvm)
                        continue;

                sprintf (symbol2, "%sme_%x", acfg->temp_prefix, i);

                mono_dwarf_writer_emit_method (acfg->dwarf, cfg, cfg->method, cfg->asm_symbol, symbol2, cfg->asm_debug_symbol, (guint8 *)cfg->jit_info->code_start, cfg->jit_info->code_size, cfg->args, cfg->locals, cfg->unwind_ops, mono_debug_find_method (cfg->jit_info->d.method, mono_domain_get ()));
        }
#endif
}

#ifdef EMIT_WIN32_CODEVIEW_INFO
typedef struct _CodeViewSubSectionData
{
        gchar *start_section;
        gchar *end_section;
        gchar *start_section_record;
        gchar *end_section_record;
        int section_type;
        int section_record_type;
        int section_id;
} CodeViewSubsectionData;

typedef struct _CodeViewCompilerVersion
{
        gint major;
        gint minor;
        gint revision;
        gint patch;
} CodeViewCompilerVersion;

#define CODEVIEW_SUBSECTION_SYMBOL_TYPE 0xF1
#define CODEVIEW_SUBSECTION_RECORD_COMPILER_TYPE 0x113c
#define CODEVIEW_SUBSECTION_RECORD_FUNCTION_START_TYPE 0x1147
#define CODEVIEW_SUBSECTION_RECORD_FUNCTION_END_TYPE 0x114F
#define CODEVIEW_CSHARP_LANGUAGE_TYPE 0x0A
#define CODEVIEW_CPU_TYPE 0x0
#define CODEVIEW_MAGIC_HEADER 0x4

static void
codeview_clear_subsection_data (CodeViewSubsectionData *section_data)
{
        g_free (section_data->start_section);
        g_free (section_data->end_section);
        g_free (section_data->start_section_record);
        g_free (section_data->end_section_record);

        memset (section_data, 0, sizeof (CodeViewSubsectionData));
}

static void
codeview_parse_compiler_version (gchar *version, CodeViewCompilerVersion *data)
{
        gint values[4] = { 0 };
        gint *value = values;

        while (*version && (value < values + G_N_ELEMENTS (values))) {
                if (isdigit (*version)) {
                        *value *= 10;
                        *value += *version - '0';
                }
                else if (*version == '.') {
                        value++;
                }

                version++;
        }

        data->major = values[0];
        data->minor = values[1];
        data->revision = values[2];
        data->patch = values[3];
}

static void
emit_codeview_start_subsection (MonoAotCompile *acfg, int section_id, int section_type, int section_record_type, CodeViewSubsectionData *section_data)
{
        // Starting a new subsection, clear old data.
        codeview_clear_subsection_data (section_data);

        // Keep subsection data.
        section_data->section_id = section_id;
        section_data->section_type = section_type;
        section_data->section_record_type = section_record_type;

        // Allocate all labels used in subsection.
        section_data->start_section = g_strdup_printf ("%scvs_%d", acfg->temp_prefix, section_data->section_id);
        section_data->end_section = g_strdup_printf ("%scvse_%d", acfg->temp_prefix, section_data->section_id);
        section_data->start_section_record = g_strdup_printf ("%scvsr_%d", acfg->temp_prefix, section_data->section_id);
        section_data->end_section_record = g_strdup_printf ("%scvsre_%d", acfg->temp_prefix, section_data->section_id);

        // Subsection type, function symbol.
        emit_int32 (acfg, section_data->section_type);

        // Subsection size.
        emit_symbol_diff (acfg, section_data->end_section, section_data->start_section, 0);
        emit_label (acfg, section_data->start_section);

        // Subsection record size.
        fprintf (acfg->fp, "\t.word %s - %s\n", section_data->end_section_record, section_data->start_section_record);
        emit_label (acfg, section_data->start_section_record);

        // Subsection record type.
        emit_int16 (acfg, section_record_type);
}

static void
emit_codeview_end_subsection (MonoAotCompile *acfg, CodeViewSubsectionData *section_data, int *section_id)
{
        g_assert (section_data->start_section);
        g_assert (section_data->end_section);
        g_assert (section_data->start_section_record);
        g_assert (section_data->end_section_record);

        emit_label (acfg, section_data->end_section_record);

        if (section_data->section_record_type == CODEVIEW_SUBSECTION_RECORD_FUNCTION_START_TYPE) {
                // Emit record length.
                emit_int16 (acfg, 2);

                // Emit specific record type end.
                emit_int16 (acfg, CODEVIEW_SUBSECTION_RECORD_FUNCTION_END_TYPE);
        }

        emit_label (acfg, section_data->end_section);

        // Next subsection needs to be 4 byte aligned.
        emit_alignment (acfg, 4);

        *section_id = section_data->section_id + 1;
        codeview_clear_subsection_data (section_data);
}

inline static void
emit_codeview_start_symbol_subsection (MonoAotCompile *acfg, int section_id, int section_record_type, CodeViewSubsectionData *section_data)
{
        emit_codeview_start_subsection (acfg, section_id, CODEVIEW_SUBSECTION_SYMBOL_TYPE, section_record_type, section_data);
}

inline static void
emit_codeview_end_symbol_subsection (MonoAotCompile *acfg, CodeViewSubsectionData *section_data, int *section_id)
{
        emit_codeview_end_subsection (acfg, section_data, section_id);
}

static void
emit_codeview_compiler_info (MonoAotCompile *acfg, int *section_id)
{
        CodeViewSubsectionData section_data = { 0 };
        CodeViewCompilerVersion compiler_version = { 0 };

        // Start new compiler record subsection.
        emit_codeview_start_symbol_subsection (acfg, *section_id, CODEVIEW_SUBSECTION_RECORD_COMPILER_TYPE, &section_data);

        emit_int32 (acfg, CODEVIEW_CSHARP_LANGUAGE_TYPE);
        emit_int16 (acfg, CODEVIEW_CPU_TYPE);

        // Get compiler version information.
        codeview_parse_compiler_version (VERSION, &compiler_version);

        // Compiler frontend version, 4 digits.
        emit_int16 (acfg, compiler_version.major);
        emit_int16 (acfg, compiler_version.minor);
        emit_int16 (acfg, compiler_version.revision);
        emit_int16 (acfg, compiler_version.patch);

        // Compiler backend version, 4 digits (currently same as frontend).
        emit_int16 (acfg, compiler_version.major);
        emit_int16 (acfg, compiler_version.minor);
        emit_int16 (acfg, compiler_version.revision);
        emit_int16 (acfg, compiler_version.patch);

        // Compiler string.
        emit_string (acfg, "Mono AOT compiler");

        // Done with section.
        emit_codeview_end_symbol_subsection (acfg, &section_data, section_id);
}

static void
emit_codeview_function_info (MonoAotCompile *acfg, MonoMethod *method, int *section_id, gchar *symbol, gchar *symbol_start, gchar *symbol_end)
{
        CodeViewSubsectionData section_data = { 0 };
        gchar *full_method_name = NULL;

        // Start new function record subsection.
        emit_codeview_start_symbol_subsection (acfg, *section_id, CODEVIEW_SUBSECTION_RECORD_FUNCTION_START_TYPE, &section_data);

        // Emit 3 int 0 byte padding, currently not used.
        emit_zero_bytes (acfg, sizeof (int) * 3);

        // Emit size of function.
        emit_symbol_diff (acfg, symbol_end, symbol_start, 0);

        // Emit 3 int 0 byte padding, currently not used.
        emit_zero_bytes (acfg, sizeof (int) * 3);

        // Emit reallocation info.
        fprintf (acfg->fp, "\t.secrel32 %s\n", symbol);
        fprintf (acfg->fp, "\t.secidx %s\n", symbol);

        // Emit flag, currently not used.
        emit_zero_bytes (acfg, 1);

        // Emit function name, exclude signature since it should be described by own metadata.
        full_method_name = mono_method_full_name (method, FALSE);
        emit_string (acfg, full_method_name ? full_method_name : "");
        g_free (full_method_name);

        // Done with section.
        emit_codeview_end_symbol_subsection (acfg, &section_data, section_id);
}

static void
emit_codeview_info (MonoAotCompile *acfg)
{
        int i;
        int section_id = 0;
        gchar symbol_buffer[MAX_SYMBOL_SIZE];

        // Emit codeview debug info section
        emit_section_change (acfg, ".debug$S", 0);

        // Emit magic header.
        emit_int32 (acfg, CODEVIEW_MAGIC_HEADER);

        emit_codeview_compiler_info (acfg, &section_id);

        for (i = 0; i < acfg->nmethods; ++i) {
                MonoCompile *cfg = acfg->cfgs[i];

                if (!cfg || COMPILE_LLVM (cfg))
                        continue;

                int ret = g_snprintf (symbol_buffer, G_N_ELEMENTS (symbol_buffer), "%sme_%x", acfg->temp_prefix, i);
                if (ret > 0 && ret < G_N_ELEMENTS (symbol_buffer))
                        emit_codeview_function_info (acfg, cfg->method, &section_id, cfg->asm_debug_symbol, cfg->asm_symbol, symbol_buffer);
        }
}
#else
static void
emit_codeview_info (MonoAotCompile *acfg)
{
}
#endif /* EMIT_WIN32_CODEVIEW_INFO */

#ifdef EMIT_WIN32_UNWIND_INFO
static UnwindInfoSectionCacheItem *
get_cached_unwind_info_section_item_win32 (MonoAotCompile *acfg, const char *function_start, const char *function_end, GSList *unwind_ops)
{
        UnwindInfoSectionCacheItem *item = NULL;

        if (!acfg->unwind_info_section_cache)
                acfg->unwind_info_section_cache = g_list_alloc ();

        PUNWIND_INFO unwind_info = mono_arch_unwindinfo_alloc_unwind_info (unwind_ops);

        // Search for unwind info in cache.
        GList *list = acfg->unwind_info_section_cache;
        int list_size = 0;
        while (list && list->data) {
                item = (UnwindInfoSectionCacheItem*)list->data;
                if (!memcmp (unwind_info, item->unwind_info, sizeof (UNWIND_INFO))) {
                        // Cache hit, return cached item.
                        return item;
                }
                list = list->next;
                list_size++;
        }

        // Add to cache.
        if (acfg->unwind_info_section_cache) {
                item = g_new0 (UnwindInfoSectionCacheItem, 1);
                if (item) {
                        // Format .xdata section label for function, used to get unwind info address RVA.
                        // Since the unwind info is similar for most functions, the symbol will be reused.
                        item->xdata_section_label = g_strdup_printf ("%sunwind_%d", acfg->temp_prefix, list_size);

                        // Cache unwind info data, used when checking cache for matching unwind info. NOTE, cache takes
                        //over ownership of unwind info.
                        item->unwind_info = unwind_info;

                        // Needs to be emitted once.
                        item->xdata_section_emitted = FALSE;

                        // Prepend to beginning of list to speed up inserts.
                        acfg->unwind_info_section_cache = g_list_prepend (acfg->unwind_info_section_cache, (gpointer)item);
                }
        }

        return item;
}

static void
free_unwind_info_section_cache_win32 (MonoAotCompile *acfg)
{
        GList *list = acfg->unwind_info_section_cache;

        while (list) {
                UnwindInfoSectionCacheItem *item = (UnwindInfoSectionCacheItem *)list->data;
                if (item) {
                        g_free (item->xdata_section_label);
                        mono_arch_unwindinfo_free_unwind_info (item->unwind_info);

                        g_free (item);
                        list->data = NULL;
                }

                list = list->next;
        }

        g_list_free (acfg->unwind_info_section_cache);
        acfg->unwind_info_section_cache = NULL;
}

static void
emit_unwind_info_data_win32 (MonoAotCompile *acfg, PUNWIND_INFO unwind_info)
{
        // Emit the unwind info struct.
        emit_bytes (acfg, (guint8*)unwind_info, sizeof (UNWIND_INFO) - (sizeof (UNWIND_CODE) * MONO_MAX_UNWIND_CODES));

        // Emit all unwind codes encoded in unwind info struct.
        PUNWIND_CODE current_unwind_node = &unwind_info->UnwindCode[MONO_MAX_UNWIND_CODES - unwind_info->CountOfCodes];
        PUNWIND_CODE last_unwind_node = &unwind_info->UnwindCode[MONO_MAX_UNWIND_CODES];

        while (current_unwind_node < last_unwind_node) {
                guint8 node_count = 0;
                switch (current_unwind_node->UnwindOp) {
                case UWOP_PUSH_NONVOL:
                case UWOP_ALLOC_SMALL:
                case UWOP_SET_FPREG:
                case UWOP_PUSH_MACHFRAME:
                        node_count = 1;
                        break;
                case UWOP_SAVE_NONVOL:
                case UWOP_SAVE_XMM128:
                        node_count = 2;
                        break;
                case UWOP_SAVE_NONVOL_FAR:
                case UWOP_SAVE_XMM128_FAR:
                        node_count = 3;
                        break;
                case UWOP_ALLOC_LARGE:
                        if (current_unwind_node->OpInfo == 0)
                                node_count = 2;
                        else
                                node_count = 3;
                        break;
                default:
                        g_assert (!"Unknown unwind opcode.");
                }

                while (node_count > 0) {
                        g_assert (current_unwind_node < last_unwind_node);

                        //Emit current node.
                        emit_bytes (acfg, (guint8*)current_unwind_node, sizeof (UNWIND_CODE));

                        node_count--;
                        current_unwind_node++;
                }
        }
}

// Emit unwind info sections for each function. Unwind info on Windows x64 is emitted into two different sections.
// .pdata includes the serialized DWORD aligned RVA's of function start, end and address of serialized
// UNWIND_INFO struct emitted into .xdata, see https://msdn.microsoft.com/en-us/library/ft9x1kdx.aspx.
// .xdata section includes DWORD aligned serialized version of UNWIND_INFO struct, https://msdn.microsoft.com/en-us/library/ddssxxy8.aspx.
static void
emit_unwind_info_sections_win32 (MonoAotCompile *acfg, const char *function_start, const char *function_end, GSList *unwind_ops)
{
        char *pdata_section_label = NULL;

        int temp_prefix_len = (acfg->temp_prefix != NULL) ? strlen (acfg->temp_prefix) : 0;
        if (strncmp (function_start, acfg->temp_prefix, temp_prefix_len)) {
                temp_prefix_len = 0;
        }

        // Format .pdata section label for function.
        pdata_section_label = g_strdup_printf ("%spdata_%s", acfg->temp_prefix, function_start + temp_prefix_len);

        UnwindInfoSectionCacheItem *cache_item = get_cached_unwind_info_section_item_win32 (acfg, function_start, function_end, unwind_ops);
        g_assert (cache_item && cache_item->xdata_section_label && cache_item->unwind_info);

        // Emit .pdata section.
        emit_section_change (acfg, ".pdata", 0);
        emit_alignment (acfg, sizeof (DWORD));
        emit_label (acfg, pdata_section_label);

        // Emit function start address RVA.
        fprintf (acfg->fp, "\t.long %s@IMGREL\n", function_start);

        // Emit function end address RVA.
        fprintf (acfg->fp, "\t.long %s@IMGREL\n", function_end);

        // Emit unwind info address RVA.
        fprintf (acfg->fp, "\t.long %s@IMGREL\n", cache_item->xdata_section_label);

        if (!cache_item->xdata_section_emitted) {
                // Emit .xdata section.
                emit_section_change (acfg, ".xdata", 0);
                emit_alignment (acfg, sizeof (DWORD));
                emit_label (acfg, cache_item->xdata_section_label);

                // Emit unwind info into .xdata section.
                emit_unwind_info_data_win32 (acfg, cache_item->unwind_info);
                cache_item->xdata_section_emitted = TRUE;
        }

        g_free (pdata_section_label);
}
#endif

static gboolean
should_emit_gsharedvt_method (MonoAotCompile *acfg, MonoMethod *method)
{
#ifdef TARGET_WASM
        if (acfg->image == mono_get_corlib () && !strcmp (m_class_get_name (method->klass), "Vector`1"))
                /* The SIMD fallback code in Vector<T> is very large, and not likely to be used */
                return FALSE;
#endif
        if (acfg->image == mono_get_corlib () && !strcmp (m_class_get_name (method->klass), "Volatile"))
                /* Read<T>/Write<T> are not needed and cause JIT failures */
                return FALSE;
        return TRUE;
}

static gboolean
collect_methods (MonoAotCompile *acfg)
{
        int mindex, i;
        MonoImage *image = acfg->image;

        /* Collect methods */
        for (i = 0; i < image->tables [MONO_TABLE_METHOD].rows; ++i) {
                ERROR_DECL (error);
                MonoMethod *method;
                guint32 token = MONO_TOKEN_METHOD_DEF | (i + 1);

                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);

                if (!method) {
                        aot_printerrf (acfg, "Failed to load method 0x%x from '%s' due to %s.\n", token, image->name, mono_error_get_message (error));
                        aot_printerrf (acfg, "Run with MONO_LOG_LEVEL=debug for more information.\n");
                        mono_error_cleanup (error);
                        return FALSE;
                }
                        
                /* Load all methods eagerly to skip the slower lazy loading code */
                mono_class_setup_methods (method->klass);

                if (mono_aot_mode_is_full (&acfg->aot_opts) && method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) {
                        /* Compile the wrapper instead */
                        /* We do this here instead of add_wrappers () because it is easy to do it here */
                        MonoMethod *wrapper = mono_marshal_get_native_wrapper (method, TRUE, TRUE);
                        method = wrapper;
                }

                /* FIXME: Some mscorlib methods don't have debug info */
                /*
                if (acfg->aot_opts.soft_debug && !method->wrapper_type) {
                        if (!((method->flags & METHOD_ATTRIBUTE_PINVOKE_IMPL) ||
                                  (method->iflags & METHOD_IMPL_ATTRIBUTE_RUNTIME) ||
                                  (method->flags & METHOD_ATTRIBUTE_ABSTRACT) ||
                                  (method->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL))) {
                                if (!mono_debug_lookup_method (method)) {
                                        fprintf (stderr, "Method %s has no debug info, probably the .mdb file for the assembly is missing.\n", mono_method_get_full_name (method));
                                        exit (1);
                                }
                        }
                }
                */

                if (method->is_generic || mono_class_is_gtd (method->klass)) {
                        /* Compile the ref shared version instead */
                        method = mini_get_shared_method_full (method, SHARE_MODE_NONE, error);
                        if (!method) {
                                aot_printerrf (acfg, "Failed to load method 0x%x from '%s' due to %s.\n", token, image->name, mono_error_get_message (error));
                                aot_printerrf (acfg, "Run with MONO_LOG_LEVEL=debug for more information.\n");
                                mono_error_cleanup (error);
                                return FALSE;
                        }
                }

                /* Since we add the normal methods first, their index will be equal to their zero based token index */
                add_method_with_index (acfg, method, i, FALSE);
                acfg->method_index ++;
        }

        /* gsharedvt methods */
        for (mindex = 0; mindex < image->tables [MONO_TABLE_METHOD].rows; ++mindex) {
                ERROR_DECL (error);
                MonoMethod *method;
                guint32 token = MONO_TOKEN_METHOD_DEF | (mindex + 1);

                if (!(acfg->opts & MONO_OPT_GSHAREDVT))
                        continue;

                method = mono_get_method_checked (acfg->image, token, NULL, NULL, error);
                report_loader_error (acfg, error, TRUE, "Failed to load method token 0x%x due to %s\n", i, mono_error_get_message (error));

                if ((method->is_generic || mono_class_is_gtd (method->klass)) && should_emit_gsharedvt_method (acfg, method)) {
                        MonoMethod *gshared;

                        gshared = mini_get_shared_method_full (method, SHARE_MODE_GSHAREDVT, error);
                        mono_error_assert_ok (error);

                        add_extra_method (acfg, gshared);
                }
        }

        if (mono_aot_mode_is_full (&acfg->aot_opts) || mono_aot_mode_is_hybrid (&acfg->aot_opts))
                add_generic_instances (acfg);

        if (mono_aot_mode_is_full (&acfg->aot_opts))
                add_wrappers (acfg);
        return TRUE;
}

static void
compile_methods (MonoAotCompile *acfg)
{
        int i, methods_len;

        if (acfg->aot_opts.nthreads > 0) {
                GPtrArray *frag;
                int len, j;
                GPtrArray *threads;
                MonoThreadHandle *thread_handle;
                gpointer *user_data;
                MonoMethod **methods;

                methods_len = acfg->methods->len;

                len = acfg->methods->len / acfg->aot_opts.nthreads;
                g_assert (len > 0);
                /* 
                 * Partition the list of methods into fragments, and hand it to threads to
                 * process.
                 */
                threads = g_ptr_array_new ();
                /* Make a copy since acfg->methods is modified by compile_method () */
                methods = g_new0 (MonoMethod*, methods_len);
                //memcpy (methods, g_ptr_array_index (acfg->methods, 0), sizeof (MonoMethod*) * methods_len);
                for (i = 0; i < methods_len; ++i)
                        methods [i] = (MonoMethod *)g_ptr_array_index (acfg->methods, i);
                i = 0;
                while (i < methods_len) {
                        ERROR_DECL (error);
                        MonoInternalThread *thread;

                        frag = g_ptr_array_new ();
                        for (j = 0; j < len; ++j) {
                                if (i < methods_len) {
                                        g_ptr_array_add (frag, methods [i]);
                                        i ++;
                                }
                        }

                        user_data = g_new0 (gpointer, 3);
                        user_data [0] = acfg;
                        user_data [1] = frag;
                        
                        thread = mono_thread_create_internal (mono_domain_get (), (gpointer)compile_thread_main, user_data, MONO_THREAD_CREATE_FLAGS_NONE, error);
                        mono_error_assert_ok (error);

                        thread_handle = mono_threads_open_thread_handle (thread->handle);
                        g_ptr_array_add (threads, thread_handle);
                }
                g_free (methods);

                for (i = 0; i < threads->len; ++i) {
                        mono_thread_info_wait_one_handle ((MonoThreadHandle*)g_ptr_array_index (threads, i), MONO_INFINITE_WAIT, FALSE);
                        mono_threads_close_thread_handle ((MonoThreadHandle*)g_ptr_array_index (threads, i));
                }
        } else {
                methods_len = 0;
        }

        /* Compile methods added by compile_method () or all methods if nthreads == 0 */
        for (i = methods_len; i < acfg->methods->len; ++i) {
                /* This can add new methods to acfg->methods */
                compile_method (acfg, (MonoMethod *)g_ptr_array_index (acfg->methods, i));
        }

#ifdef ENABLE_LLVM
        if (acfg->llvm)
                mono_llvm_fixup_aot_module ();
#endif
}

static int
compile_asm (MonoAotCompile *acfg)
{
        char *command, *objfile;
        char *outfile_name, *tmp_outfile_name, *llvm_ofile;
        const char *tool_prefix = acfg->aot_opts.tool_prefix ? acfg->aot_opts.tool_prefix : "";
        char *ld_flags = acfg->aot_opts.ld_flags ? acfg->aot_opts.ld_flags : g_strdup("");

#ifdef TARGET_WIN32_MSVC
#define AS_OPTIONS "-c -x assembler"
#elif defined(TARGET_AMD64) && !defined(TARGET_MACH)
#define AS_OPTIONS "--64"
#elif defined(TARGET_POWERPC64)
#define AS_OPTIONS "-a64 -mppc64"
#elif defined(sparc) && TARGET_SIZEOF_VOID_P == 8
#define AS_OPTIONS "-xarch=v9"
#elif defined(TARGET_X86) && defined(TARGET_MACH)
#define AS_OPTIONS "-arch i386"
#elif defined(TARGET_X86) && !defined(TARGET_MACH)
#define AS_OPTIONS "--32"
#else
#define AS_OPTIONS ""
#endif

#if defined(TARGET_OSX)
#define AS_NAME "clang"
#elif defined(TARGET_WIN32_MSVC)
#define AS_NAME "clang.exe"
#else
#define AS_NAME "as"
#endif

#ifdef TARGET_WIN32_MSVC
#define AS_OBJECT_FILE_SUFFIX "obj"
#else
#define AS_OBJECT_FILE_SUFFIX "o"
#endif

#if defined(sparc)
#define LD_NAME "ld"
#define LD_OPTIONS "-shared -G"
#elif defined(__ppc__) && defined(TARGET_MACH)
#define LD_NAME "gcc"
#define LD_OPTIONS "-dynamiclib"
#elif defined(TARGET_AMD64) && defined(TARGET_MACH)
#define LD_NAME "clang"
#define LD_OPTIONS "--shared"
#elif defined(TARGET_WIN32_MSVC)
#define LD_NAME "link.exe"
#define LD_OPTIONS "/DLL /MACHINE:X64 /NOLOGO /INCREMENTAL:NO"
#define LD_DEBUG_OPTIONS LD_OPTIONS " /DEBUG"
#elif defined(TARGET_WIN32) && !defined(TARGET_ANDROID)
#define LD_NAME "gcc"
#define LD_OPTIONS "-shared"
#elif defined(TARGET_X86) && defined(TARGET_MACH)
#define LD_NAME "clang"
#define LD_OPTIONS "-m32 -dynamiclib"
#elif defined(TARGET_X86) && !defined(TARGET_MACH)
#define LD_OPTIONS "-m elf_i386"
#elif defined(TARGET_ARM) && !defined(TARGET_ANDROID)
#define LD_NAME "gcc"
#define LD_OPTIONS "--shared"
#elif defined(TARGET_POWERPC64)
#define LD_OPTIONS "-m elf64ppc"
#endif

#ifndef LD_OPTIONS
#define LD_OPTIONS ""
#endif

        if (acfg->aot_opts.asm_only) {
                aot_printf (acfg, "Output file: '%s'.\n", acfg->tmpfname);
                if (acfg->aot_opts.static_link)
                        aot_printf (acfg, "Linking symbol: '%s'.\n", acfg->static_linking_symbol);
                if (acfg->llvm)
                        aot_printf (acfg, "LLVM output file: '%s'.\n", acfg->llvm_sfile);
                return 0;
        }

        if (acfg->aot_opts.static_link) {
                if (acfg->aot_opts.outfile)
                        objfile = g_strdup_printf ("%s", acfg->aot_opts.outfile);
                else
                        objfile = g_strdup_printf ("%s." AS_OBJECT_FILE_SUFFIX, acfg->image->name);
        } else {
                objfile = g_strdup_printf ("%s." AS_OBJECT_FILE_SUFFIX, acfg->tmpfname);
        }

#ifdef TARGET_OSX
        g_string_append (acfg->as_args, "-c -x assembler");
#endif

        command = g_strdup_printf ("\"%s%s\" %s %s -o %s %s", tool_prefix, AS_NAME, AS_OPTIONS,
                        acfg->as_args ? acfg->as_args->str : "", 
                        wrap_path (objfile), wrap_path (acfg->tmpfname));
        aot_printf (acfg, "Executing the native assembler: %s\n", command);
        if (execute_system (command) != 0) {
                g_free (command);
                g_free (objfile);
                return 1;
        }

        if (acfg->llvm && !acfg->llvm_owriter) {
                command = g_strdup_printf ("\"%s%s\" %s %s -o %s %s", tool_prefix, AS_NAME, AS_OPTIONS,
                        acfg->as_args ? acfg->as_args->str : "",
                        wrap_path (acfg->llvm_ofile), wrap_path (acfg->llvm_sfile));
                aot_printf (acfg, "Executing the native assembler: %s\n", command);
                if (execute_system (command) != 0) {
                        g_free (command);
                        g_free (objfile);
                        return 1;
                }
        }

        g_free (command);

        if (acfg->aot_opts.static_link) {
                aot_printf (acfg, "Output file: '%s'.\n", objfile);
                aot_printf (acfg, "Linking symbol: '%s'.\n", acfg->static_linking_symbol);
                g_free (objfile);
                return 0;
        }

        if (acfg->aot_opts.outfile)
                outfile_name = g_strdup_printf ("%s", acfg->aot_opts.outfile);
        else
                outfile_name = g_strdup_printf ("%s%s", acfg->image->name, MONO_SOLIB_EXT);

        tmp_outfile_name = g_strdup_printf ("%s.tmp", outfile_name);

        if (acfg->llvm) {
                llvm_ofile = g_strdup_printf ("\"%s\"", acfg->llvm_ofile);
        } else {
                llvm_ofile = g_strdup ("");
        }

        /* replace the ; flags separators with spaces */
        g_strdelimit (ld_flags, ';', ' ');

        if (acfg->aot_opts.llvm_only)
                ld_flags = g_strdup_printf ("%s %s", ld_flags, "-lstdc++");

#ifdef TARGET_WIN32_MSVC
        g_assert (tmp_outfile_name != NULL);
        g_assert (objfile != NULL);
        command = g_strdup_printf ("\"%s%s\" %s %s /OUT:%s %s %s", tool_prefix, LD_NAME,
                        acfg->aot_opts.nodebug ? LD_OPTIONS : LD_DEBUG_OPTIONS, ld_flags, wrap_path (tmp_outfile_name), wrap_path (objfile), wrap_path (llvm_ofile));
#elif defined(LD_NAME)
        command = g_strdup_printf ("%s%s %s -o %s %s %s %s", tool_prefix, LD_NAME, LD_OPTIONS,
                wrap_path (tmp_outfile_name), wrap_path (llvm_ofile),
                wrap_path (g_strdup_printf ("%s." AS_OBJECT_FILE_SUFFIX, acfg->tmpfname)), ld_flags);
#else
        // Default (linux)
        if (acfg->aot_opts.tool_prefix) {
                /* Cross compiling */
                command = g_strdup_printf ("\"%sld\" %s -shared -o %s %s %s %s", tool_prefix, LD_OPTIONS,
                                                                   wrap_path (tmp_outfile_name), wrap_path (llvm_ofile),
                                                                   wrap_path (g_strdup_printf ("%s." AS_OBJECT_FILE_SUFFIX, acfg->tmpfname)), ld_flags);
        } else {
                char *args = g_strdup_printf ("%s -shared -o %s %s %s %s", LD_OPTIONS,
                                                                          wrap_path (tmp_outfile_name), wrap_path (llvm_ofile),
                                                                          wrap_path (g_strdup_printf ("%s." AS_OBJECT_FILE_SUFFIX, acfg->tmpfname)), ld_flags);

                if (acfg->aot_opts.llvm_only) {
                        command = g_strdup_printf ("%s %s", acfg->aot_opts.clangxx, args);
                } else {
                        command = g_strdup_printf ("\"%sld\" %s", tool_prefix, args);
                }
                g_free (args);
        }
#endif
        aot_printf (acfg, "Executing the native linker: %s\n", command);
        if (execute_system (command) != 0) {
                g_free (tmp_outfile_name);
                g_free (outfile_name);
                g_free (command);
                g_free (objfile);
                g_free (ld_flags);
                return 1;
        }

        g_free (command);

        /*com = g_strdup_printf ("strip --strip-unneeded %s%s", acfg->image->name, MONO_SOLIB_EXT);
        printf ("Stripping the binary: %s\n", com);
        execute_system (com);
        g_free (com);*/

#if defined(TARGET_ARM) && !defined(TARGET_MACH)
        /* 
         * gas generates 'mapping symbols' each time code and data is mixed, which 
         * happens a lot in emit_and_reloc_code (), so we need to get rid of them.
         */
        command = g_strdup_printf ("\"%sstrip\" --strip-symbol=\\$a --strip-symbol=\\$d %s", wrap_path(tool_prefix), wrap_path(tmp_outfile_name));
        aot_printf (acfg, "Stripping the binary: %s\n", command);
        if (execute_system (command) != 0) {
                g_free (tmp_outfile_name);
                g_free (outfile_name);
                g_free (command);
                g_free (objfile);
                return 1;
        }
#endif

        if (0 != rename (tmp_outfile_name, outfile_name)) {
                if (G_FILE_ERROR_EXIST == g_file_error_from_errno (errno)) {
                        /* Since we are rebuilding the module we need to be able to replace any old copies. Remove old file and retry rename operation. */
                        unlink (outfile_name);
                        rename (tmp_outfile_name, outfile_name);
                }
        }

#if defined(TARGET_MACH)
        command = g_strdup_printf ("dsymutil \"%s\"", outfile_name);
        aot_printf (acfg, "Executing dsymutil: %s\n", command);
        if (execute_system (command) != 0) {
                return 1;
        }
#endif

        if (!acfg->aot_opts.save_temps)
                unlink (objfile);

        g_free (tmp_outfile_name);
        g_free (outfile_name);
        g_free (objfile);

        if (acfg->aot_opts.save_temps)
                aot_printf (acfg, "Retained input file.\n");
        else
                unlink (acfg->tmpfname);

        return 0;
}

static guint8
profread_byte (FILE *infile)
{
        guint8 i;
        int res;

        res = fread (&i, 1, 1, infile);
        g_assert (res == 1);
        return i;
}

static int
profread_int (FILE *infile)
{
        int i, res;

        res = fread (&i, 4, 1, infile);
        g_assert (res == 1);
        return i;
}

static char*
profread_string (FILE *infile)
{
        int len, res;
        char *pbuf;

        len = profread_int (infile);
        pbuf = (char*)g_malloc (len + 1);
        res = fread (pbuf, 1, len, infile);
        g_assert (res == len);
        pbuf [len] = '\0';
        return pbuf;
}

static void
load_profile_file (MonoAotCompile *acfg, char *filename)
{
        FILE *infile;
        char buf [1024];
        int res, len, version;
        char magic [32];

        infile = fopen (filename, "rb");
        if (!infile) {
                fprintf (stderr, "Unable to open file '%s': %s.\n", filename, strerror (errno));
                exit (1);
        }

        printf ("Using profile data file '%s'\n", filename);

        sprintf (magic, AOT_PROFILER_MAGIC);
        len = strlen (magic);
        res = fread (buf, 1, len, infile);
        magic [len] = '\0';
        buf [len] = '\0';
        if ((res != len) || strcmp (buf, magic) != 0) {
                printf ("Profile file has wrong header: '%s'.\n", buf);
                fclose (infile);
                exit (1);
        }
        guint32 expected_version = (AOT_PROFILER_MAJOR_VERSION << 16) | AOT_PROFILER_MINOR_VERSION;
        version = profread_int (infile);
        if (version != expected_version) {
                printf ("Profile file has wrong version 0x%4x, expected 0x%4x.\n", version, expected_version);
                fclose (infile);
                exit (1);
        }

        ProfileData *data = g_new0 (ProfileData, 1);
        data->images = g_hash_table_new (NULL, NULL);
        data->classes = g_hash_table_new (NULL, NULL);
        data->ginsts = g_hash_table_new (NULL, NULL);
        data->methods = g_hash_table_new (NULL, NULL);

        while (TRUE) {
                int type = profread_byte (infile);
                int id = profread_int (infile);

                if (type == AOTPROF_RECORD_NONE)
                        break;

                switch (type) {
                case AOTPROF_RECORD_IMAGE: {
                        ImageProfileData *idata = g_new0 (ImageProfileData, 1);
                        idata->name = profread_string (infile);
                        char *mvid = profread_string (infile);
                        g_free (mvid);
                        g_hash_table_insert (data->images, GINT_TO_POINTER (id), idata);
                        break;
                }
                case AOTPROF_RECORD_GINST: {
                        int i;
                        int len = profread_int (infile);

                        GInstProfileData *gdata = g_new0 (GInstProfileData, 1);
                        gdata->argc = len;
                        gdata->argv = g_new0 (ClassProfileData*, len);

                        for (i = 0; i < len; ++i) {
                                int class_id = profread_int (infile);

                                gdata->argv [i] = (ClassProfileData*)g_hash_table_lookup (data->classes, GINT_TO_POINTER (class_id));
                                g_assert (gdata->argv [i]);
                        }
                        g_hash_table_insert (data->ginsts, GINT_TO_POINTER (id), gdata);
                        break;
                }
                case AOTPROF_RECORD_TYPE: {
                        int type = profread_byte (infile);

                        switch (type) {
                        case MONO_TYPE_CLASS: {
                                int image_id = profread_int (infile);
                                int ginst_id = profread_int (infile);
                                char *class_name = profread_string (infile);

                                ImageProfileData *image = (ImageProfileData*)g_hash_table_lookup (data->images, GINT_TO_POINTER (image_id));
                                g_assert (image);

                                char *p = strrchr (class_name, '.');
                                g_assert (p);
                                *p = '\0';

                                ClassProfileData *cdata = g_new0 (ClassProfileData, 1);
                                cdata->image = image;
                                cdata->ns = g_strdup (class_name);
                                cdata->name = g_strdup (p + 1);

                                if (ginst_id != -1) {
                                        cdata->inst = (GInstProfileData*)g_hash_table_lookup (data->ginsts, GINT_TO_POINTER (ginst_id));
                                        g_assert (cdata->inst);
                                }
                                g_free (class_name);

                                g_hash_table_insert (data->classes, GINT_TO_POINTER (id), cdata);
                                break;
                        }
#if 0
                        case MONO_TYPE_SZARRAY: {
                                int elem_id = profread_int (infile);
                                // FIXME:
                                break;
                        }
#endif
                        default:
                                g_assert_not_reached ();
                                break;
                        }
                        break;
                }
                case AOTPROF_RECORD_METHOD: {
                        int class_id = profread_int (infile);
                        int ginst_id = profread_int (infile);
                        int param_count = profread_int (infile);
                        char *method_name = profread_string (infile);
                        char *sig = profread_string (infile);

                        ClassProfileData *klass = (ClassProfileData*)g_hash_table_lookup (data->classes, GINT_TO_POINTER (class_id));
                        g_assert (klass);

                        MethodProfileData *mdata = g_new0 (MethodProfileData, 1);
                        mdata->id = id;
                        mdata->klass = klass;
                        mdata->name = method_name;
                        mdata->signature = sig;
                        mdata->param_count = param_count;

                        if (ginst_id != -1) {
                                mdata->inst = (GInstProfileData*)g_hash_table_lookup (data->ginsts, GINT_TO_POINTER (ginst_id));
                                g_assert (mdata->inst);
                        }
                        g_hash_table_insert (data->methods, GINT_TO_POINTER (id), mdata);
                        break;
                }
                default:
                        printf ("%d\n", type);
                        g_assert_not_reached ();
                        break;
                }
        }

        fclose (infile);
        acfg->profile_data = g_list_append (acfg->profile_data, data);
}

static void
resolve_class (ClassProfileData *cdata);

static void
resolve_ginst (GInstProfileData *inst_data)
{
        int i;

        if (inst_data->inst)
                return;

        for (i = 0; i < inst_data->argc; ++i) {
                resolve_class (inst_data->argv [i]);
                if (!inst_data->argv [i]->klass)
                        return;
        }
        MonoType **args = g_new0 (MonoType*, inst_data->argc);
        for (i = 0; i < inst_data->argc; ++i)
                args [i] = m_class_get_byval_arg (inst_data->argv [i]->klass);

        inst_data->inst = mono_metadata_get_generic_inst (inst_data->argc, args);
}

static void
resolve_class (ClassProfileData *cdata)
{
        ERROR_DECL (error);
        MonoClass *klass;

        if (!cdata->image->image)
                return;

        klass = mono_class_from_name_checked (cdata->image->image, cdata->ns, cdata->name, error);
        if (!klass) {
                //printf ("[%s] %s.%s\n", cdata->image->name, cdata->ns, cdata->name);
                return;
        }
        if (cdata->inst) {
                resolve_ginst (cdata->inst);
                if (!cdata->inst->inst)
                        return;
                MonoGenericContext ctx;

                memset (&ctx, 0, sizeof (ctx));
                ctx.class_inst = cdata->inst->inst;
                cdata->klass = mono_class_inflate_generic_class_checked (klass, &ctx, error);
        } else {
                cdata->klass = klass;
        }
}

/*
 * Resolve the profile data to the corresponding loaded classes/methods etc. if possible.
 */
static void
resolve_profile_data (MonoAotCompile *acfg, ProfileData *data, MonoAssembly* current)
{
        GHashTableIter iter;
        gpointer key, value;
        int i;

        if (!data)
                return;

        /* Images */
        GPtrArray *assemblies = mono_domain_get_assemblies (mono_get_root_domain (), FALSE);
        g_hash_table_iter_init (&iter, data->images);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
                ImageProfileData *idata = (ImageProfileData*)value;

                if (!strcmp (current->aname.name, idata->name)) {
                        idata->image = current->image;
                        break;
                }

                for (i = 0; i < assemblies->len; ++i) {
                        MonoAssembly *ass = (MonoAssembly*)g_ptr_array_index (assemblies, i);

                        if (!strcmp (ass->aname.name, idata->name)) {
                                idata->image = ass->image;
                                break;
                        }
                }
        }
        g_ptr_array_free (assemblies, TRUE);

        /* Classes */
        g_hash_table_iter_init (&iter, data->classes);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
                ClassProfileData *cdata = (ClassProfileData*)value;

                if (!cdata->image->image) {
                        if (acfg->aot_opts.verbose)
                                printf ("Unable to load class '%s.%s' because its image '%s' is not loaded.\n", cdata->ns, cdata->name, cdata->image->name);
                        continue;
                }

                resolve_class (cdata);
                /*
                if (cdata->klass)
                        printf ("%s %s %s\n", cdata->ns, cdata->name, mono_class_full_name (cdata->klass));
                */
        }

        /* Methods */
        g_hash_table_iter_init (&iter, data->methods);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
                MethodProfileData *mdata = (MethodProfileData*)value;
                MonoClass *klass;
                MonoMethod *m;
                gpointer miter;

                resolve_class (mdata->klass);
                klass = mdata->klass->klass;
                if (!klass) {
                        if (acfg->aot_opts.verbose)
                                printf ("Unable to load method '%s' because its class '%s.%s' is not loaded.\n", mdata->name, mdata->klass->ns, mdata->klass->name);
                        continue;
                }
                miter = NULL;
                while ((m = mono_class_get_methods (klass, &miter))) {
                        ERROR_DECL (error);

                        if (strcmp (m->name, mdata->name))
                                continue;
                        MonoMethodSignature *sig = mono_method_signature_internal (m);
                        if (!sig)
                                continue;
                        if (sig->param_count != mdata->param_count)
                                continue;
                        if (mdata->inst) {
                                resolve_ginst (mdata->inst);
                                if (!mdata->inst->inst)
                                        continue;
                                MonoGenericContext ctx;

                                memset (&ctx, 0, sizeof (ctx));
                                ctx.method_inst = mdata->inst->inst;

                                m = mono_class_inflate_generic_method_checked (m, &ctx, error);
                                if (!m)
                                        continue;
                                sig = mono_method_signature_checked (m, error);
                                if (!is_ok (error)) {
                                        mono_error_cleanup (error);
                                        continue;
                                }
                        }
                        char *sig_str = mono_signature_full_name (sig);
                        gboolean match = !strcmp (sig_str, mdata->signature);
                        g_free (sig_str);
                        if (!match)

                                continue;
                        //printf ("%s\n", mono_method_full_name (m, 1));
                        mdata->method = m;
                        break;
                }
                if (!mdata->method) {
                        if (acfg->aot_opts.verbose)
                                printf ("Unable to load method '%s' from class '%s', not found.\n", mdata->name, mono_class_full_name (klass));
                }
        }
}

static gboolean
inst_references_image (MonoGenericInst *inst, MonoImage *image)
{
        int i;

        for (i = 0; i < inst->type_argc; ++i) {
                MonoClass *k = mono_class_from_mono_type_internal (inst->type_argv [i]);
                if (m_class_get_image (k) == image)
                        return TRUE;
                if (mono_class_is_ginst (k)) {
                        MonoGenericInst *kinst = mono_class_get_context (k)->class_inst;
                        if (inst_references_image (kinst, image))
                                return TRUE;
                }
        }
        return FALSE;
}

static gboolean
is_local_inst (MonoGenericInst *inst, MonoImage *image)
{
        int i;

        for (i = 0; i < inst->type_argc; ++i) {
                MonoClass *k = mono_class_from_mono_type_internal (inst->type_argv [i]);
                if (!MONO_TYPE_IS_PRIMITIVE (inst->type_argv [i]) && m_class_get_image (k) != image)
                        return FALSE;
        }
        return TRUE;
}

static void
add_profile_instances (MonoAotCompile *acfg, ProfileData *data)
{
        GHashTableIter iter;
        gpointer key, value;
        int count = 0;

        if (!data)
                return;

        if (acfg->aot_opts.profile_only) {
                /* Add methods referenced by the profile */
                g_hash_table_iter_init (&iter, data->methods);
                while (g_hash_table_iter_next (&iter, &key, &value)) {
                        MethodProfileData *mdata = (MethodProfileData*)value;
                        MonoMethod *m = mdata->method;

                        if (!m)
                                continue;
                        if (m->is_inflated)
                                continue;
                        add_extra_method (acfg, m);
                        g_hash_table_insert (acfg->profile_methods, m, m);
                        count ++;
                }
        }

        /*
         * Add method instances 'related' to this assembly to the AOT image.
         */
        g_hash_table_iter_init (&iter, data->methods);
        while (g_hash_table_iter_next (&iter, &key, &value)) {
                MethodProfileData *mdata = (MethodProfileData*)value;
                MonoMethod *m = mdata->method;
                MonoGenericContext *ctx;

                if (!m)
                        continue;
                if (!m->is_inflated)
                        continue;

                ctx = mono_method_get_context (m);
                /* For simplicity, add instances which reference the assembly we are compiling */
                if (((ctx->class_inst && inst_references_image (ctx->class_inst, acfg->image)) ||
                         (ctx->method_inst && inst_references_image (ctx->method_inst, acfg->image))) &&
                        !mono_method_is_generic_sharable_full (m, FALSE, FALSE, FALSE)) {
                        //printf ("%s\n", mono_method_full_name (m, TRUE));
                        add_extra_method (acfg, m);
                        count ++;
                } else if (m_class_get_image (m->klass) == acfg->image &&
                        ((ctx->class_inst && is_local_inst (ctx->class_inst, acfg->image)) ||
                         (ctx->method_inst && is_local_inst (ctx->method_inst, acfg->image))) &&
                        !mono_method_is_generic_sharable_full (m, FALSE, FALSE, FALSE))  {
                        /* Add instances where the gtd is in the assembly and its inflated with types from this assembly or corlib */
                        //printf ("%s\n", mono_method_full_name (m, TRUE));
                        add_extra_method (acfg, m);
                        count ++;
                }
                /*
                 * FIXME: We might skip some instances, for example:
                 * Foo<Bar> won't be compiled when compiling Foo's assembly since it doesn't match the first case,
                 * and it won't be compiled when compiling Bar's assembly if Foo's assembly is not loaded.
                 */
        }

        printf ("Added %d methods from profile.\n", count);
}

static void
init_got_info (GotInfo *info)
{
        int i;

        info->patch_to_got_offset = g_hash_table_new (mono_patch_info_hash, mono_patch_info_equal);
        info->patch_to_got_offset_by_type = g_new0 (GHashTable*, MONO_PATCH_INFO_NUM);
        for (i = 0; i < MONO_PATCH_INFO_NUM; ++i)
                info->patch_to_got_offset_by_type [i] = g_hash_table_new (mono_patch_info_hash, mono_patch_info_equal);
        info->got_patches = g_ptr_array_new ();
}

static MonoAotCompile*
acfg_create (MonoAssembly *ass, guint32 opts)
{
        MonoImage *image = ass->image;
        MonoAotCompile *acfg;

        acfg = g_new0 (MonoAotCompile, 1);
        acfg->methods = g_ptr_array_new ();
        acfg->method_indexes = g_hash_table_new (NULL, NULL);
        acfg->method_depth = g_hash_table_new (NULL, NULL);
        acfg->plt_offset_to_entry = g_hash_table_new (NULL, NULL);
        acfg->patch_to_plt_entry = g_new0 (GHashTable*, MONO_PATCH_INFO_NUM);
        acfg->method_to_cfg = g_hash_table_new (NULL, NULL);
        acfg->token_info_hash = g_hash_table_new_full (NULL, NULL, NULL, NULL);
        acfg->method_to_pinvoke_import = g_hash_table_new_full (NULL, NULL, NULL, g_free);
        acfg->method_to_external_icall_symbol_name = g_hash_table_new_full (NULL, NULL, NULL, g_free);
        acfg->image_hash = g_hash_table_new (NULL, NULL);
        acfg->image_table = g_ptr_array_new ();
        acfg->globals = g_ptr_array_new ();
        acfg->image = image;
        acfg->opts = opts;
        /* TODO: Write out set of SIMD instructions used, rather than just those available */
#ifndef MONO_CROSS_COMPILE
        acfg->simd_opts = mono_arch_cpu_enumerate_simd_versions ();
#endif
        acfg->mempool = mono_mempool_new ();
        acfg->extra_methods = g_ptr_array_new ();
        acfg->unwind_info_offsets = g_hash_table_new (NULL, NULL);
        acfg->unwind_ops = g_ptr_array_new ();
        acfg->method_label_hash = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
        acfg->method_order = g_ptr_array_new ();
        acfg->export_names = g_hash_table_new (NULL, NULL);
        acfg->klass_blob_hash = g_hash_table_new (NULL, NULL);
        acfg->method_blob_hash = g_hash_table_new (NULL, NULL);
        acfg->ginst_blob_hash = g_hash_table_new (mono_metadata_generic_inst_hash, mono_metadata_generic_inst_equal);
        acfg->plt_entry_debug_sym_cache = g_hash_table_new (g_str_hash, g_str_equal);
        acfg->gsharedvt_in_signatures = g_hash_table_new ((GHashFunc)mono_signature_hash, (GEqualFunc)mono_metadata_signature_equal);
        acfg->gsharedvt_out_signatures = g_hash_table_new ((GHashFunc)mono_signature_hash, (GEqualFunc)mono_metadata_signature_equal);
        acfg->profile_methods = g_hash_table_new (NULL, NULL);
        mono_os_mutex_init_recursive (&acfg->mutex);

        init_got_info (&acfg->got_info);
        init_got_info (&acfg->llvm_got_info);

        method_to_external_icall_symbol_name = acfg->method_to_external_icall_symbol_name;
        return acfg;
}

static void
got_info_free (GotInfo *info)
{
        int i;

        for (i = 0; i < MONO_PATCH_INFO_NUM; ++i)
                g_hash_table_destroy (info->patch_to_got_offset_by_type [i]);
        g_free (info->patch_to_got_offset_by_type);
        g_hash_table_destroy (info->patch_to_got_offset);
        g_ptr_array_free (info->got_patches, TRUE);
}

static void
acfg_free (MonoAotCompile *acfg)
{
        int i;

        mono_img_writer_destroy (acfg->w);
        for (i = 0; i < acfg->nmethods; ++i)
                if (acfg->cfgs [i])
                        mono_destroy_compile (acfg->cfgs [i]);

        g_free (acfg->cfgs);

        g_free (acfg->static_linking_symbol);
        g_free (acfg->got_symbol);
        g_free (acfg->plt_symbol);
        g_ptr_array_free (acfg->methods, TRUE);
        g_ptr_array_free (acfg->image_table, TRUE);
        g_ptr_array_free (acfg->globals, TRUE);
        g_ptr_array_free (acfg->unwind_ops, TRUE);
        g_hash_table_destroy (acfg->method_indexes);
        g_hash_table_destroy (acfg->method_depth);
        g_hash_table_destroy (acfg->plt_offset_to_entry);
        for (i = 0; i < MONO_PATCH_INFO_NUM; ++i)
                g_hash_table_destroy (acfg->patch_to_plt_entry [i]);
        g_free (acfg->patch_to_plt_entry);
        g_hash_table_destroy (acfg->method_to_cfg);
        g_hash_table_destroy (acfg->token_info_hash);
        g_hash_table_destroy (acfg->method_to_pinvoke_import);
        g_hash_table_destroy (acfg->method_to_external_icall_symbol_name);
        g_hash_table_destroy (acfg->image_hash);
        g_hash_table_destroy (acfg->unwind_info_offsets);
        g_hash_table_destroy (acfg->method_label_hash);
        g_hash_table_destroy (acfg->typespec_classes);
        g_hash_table_destroy (acfg->export_names);
        g_hash_table_destroy (acfg->plt_entry_debug_sym_cache);
        g_hash_table_destroy (acfg->klass_blob_hash);
        g_hash_table_destroy (acfg->method_blob_hash);
        got_info_free (&acfg->got_info);
        got_info_free (&acfg->llvm_got_info);
        arch_free_unwind_info_section_cache (acfg);
        mono_mempool_destroy (acfg->mempool);

        method_to_external_icall_symbol_name = NULL;
        g_free (acfg);
}

#define WRAPPER(e,n) n,
static const char* const
wrapper_type_names [MONO_WRAPPER_NUM + 1] = {
#include "mono/metadata/wrapper-types.h"
        NULL
};

static G_GNUC_UNUSED const char*
get_wrapper_type_name (int type)
{
        return wrapper_type_names [type];
}

//#define DUMP_PLT
//#define DUMP_GOT

static void aot_dump (MonoAotCompile *acfg)
{
        FILE *dumpfile;
        char * dumpname;

        JsonWriter writer;
        mono_json_writer_init (&writer);

        mono_json_writer_object_begin(&writer);

        // Methods
        mono_json_writer_indent (&writer);
        mono_json_writer_object_key(&writer, "methods");
        mono_json_writer_array_begin (&writer);

        int i;
        for (i = 0; i < acfg->nmethods; ++i) {
                MonoCompile *cfg;
                MonoMethod *method;
                MonoClass *klass;

                cfg = acfg->cfgs [i];
                if (ignore_cfg (cfg))
                        continue;

                method = cfg->orig_method;

                mono_json_writer_indent (&writer);
                mono_json_writer_object_begin(&writer);

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "name");
                mono_json_writer_printf (&writer, "\"%s\",\n", method->name);

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "signature");
                mono_json_writer_printf (&writer, "\"%s\",\n", mono_method_get_full_name (method));

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "code_size");
                mono_json_writer_printf (&writer, "\"%d\",\n", cfg->code_size);

                klass = method->klass;

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "class");
                mono_json_writer_printf (&writer, "\"%s\",\n", m_class_get_name (klass));

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "namespace");
                mono_json_writer_printf (&writer, "\"%s\",\n", m_class_get_name_space (klass));

                mono_json_writer_indent (&writer);
                mono_json_writer_object_key(&writer, "wrapper_type");
                mono_json_writer_printf (&writer, "\"%s\",\n", get_wrapper_type_name(method->wrapper_type));

                mono_json_writer_indent_pop (&writer);
                mono_json_writer_indent (&writer);
                mono_json_writer_object_end (&writer);
                mono_json_writer_printf (&writer, ",\n");
        }

        mono_json_writer_indent_pop (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_array_end (&writer);
        mono_json_writer_printf (&writer, ",\n");

        // PLT entries
#ifdef DUMP_PLT
        mono_json_writer_indent_push (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_object_key(&writer, "plt");
        mono_json_writer_array_begin (&writer);

        for (i = 0; i < acfg->plt_offset; ++i) {
                MonoPltEntry *plt_entry = NULL;
                MonoJumpInfo *ji;

                if (i == 0)
                        /* 
                         * The first plt entry is unused.
                         */
                        continue;

                plt_entry = g_hash_table_lookup (acfg->plt_offset_to_entry, GUINT_TO_POINTER (i));
                ji = plt_entry->ji;

                mono_json_writer_indent (&writer);
                mono_json_writer_printf (&writer, "{ ");
                mono_json_writer_object_key(&writer, "symbol");
                mono_json_writer_printf (&writer, "\"%s\" },\n", plt_entry->symbol);
        }

        mono_json_writer_indent_pop (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_array_end (&writer);
        mono_json_writer_printf (&writer, ",\n");
#endif

        // GOT entries
#ifdef DUMP_GOT
        mono_json_writer_indent_push (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_object_key(&writer, "got");
        mono_json_writer_array_begin (&writer);

        mono_json_writer_indent_push (&writer);
        for (i = 0; i < acfg->got_info.got_patches->len; ++i) {
                MonoJumpInfo *ji = g_ptr_array_index (acfg->got_info.got_patches, i);

                mono_json_writer_indent (&writer);
                mono_json_writer_printf (&writer, "{ ");
                mono_json_writer_object_key(&writer, "patch_name");
                mono_json_writer_printf (&writer, "\"%s\" },\n", get_patch_name (ji->type));
        }

        mono_json_writer_indent_pop (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_array_end (&writer);
        mono_json_writer_printf (&writer, ",\n");
#endif

        mono_json_writer_indent_pop (&writer);
        mono_json_writer_indent (&writer);
        mono_json_writer_object_end (&writer);

        dumpname = g_strdup_printf ("%s.json", g_path_get_basename (acfg->image->name));
        dumpfile = fopen (dumpname, "w+");
        g_free (dumpname);

        fprintf (dumpfile, "%s", writer.text->str);
        fclose (dumpfile);

        mono_json_writer_destroy (&writer);
}

static const MonoJitICallId preinited_jit_icalls [] = {
        MONO_JIT_ICALL_mini_llvm_init_method,
        MONO_JIT_ICALL_mini_llvm_init_gshared_method_this,
        MONO_JIT_ICALL_mini_llvm_init_gshared_method_mrgctx,
        MONO_JIT_ICALL_mini_llvm_init_gshared_method_vtable,
        MONO_JIT_ICALL_mini_llvmonly_throw_nullref_exception,
        MONO_JIT_ICALL_mono_llvm_throw_corlib_exception,
        MONO_JIT_ICALL_mono_threads_state_poll,
        MONO_JIT_ICALL_mini_llvmonly_init_vtable_slot,
        MONO_JIT_ICALL_mono_helper_ldstr_mscorlib,
        MONO_JIT_ICALL_mono_fill_method_rgctx,
        MONO_JIT_ICALL_mono_fill_class_rgctx
};

static void
add_preinit_slot (MonoAotCompile *acfg, MonoJumpInfo *ji)
{
        if (!acfg->aot_opts.llvm_only)
                get_got_offset (acfg, FALSE, ji);
        get_got_offset (acfg, TRUE, ji);
}

static void
add_preinit_got_slots (MonoAotCompile *acfg)
{
        MonoJumpInfo *ji;
        int i;

        /*
         * Allocate the first few GOT entries to information which is needed frequently, or it is needed
         * during method initialization etc.
         */

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_IMAGE;
        ji->data.image = acfg->image;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_MSCORLIB_GOT_ADDR;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_GC_CARD_TABLE_ADDR;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_GC_NURSERY_START;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_AOT_MODULE;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_GC_NURSERY_BITS;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_INTERRUPTION_REQUEST_FLAG;
        add_preinit_slot (acfg, ji);

        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_GC_SAFE_POINT_FLAG;
        add_preinit_slot (acfg, ji);

        if (!acfg->aot_opts.llvm_only) {
                for (i = 0; i < TLS_KEY_NUM; i++) {
                        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
                        ji->type = MONO_PATCH_INFO_JIT_ICALL_ADDR_NOCALL;
                        ji->data.jit_icall_id = mono_get_tls_key_to_jit_icall_id (i);
                        add_preinit_slot (acfg, ji);
                }
        }

        /* Called by native-to-managed wrappers on possibly unattached threads */
        ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
        ji->type = MONO_PATCH_INFO_JIT_ICALL_ADDR_NOCALL;
        ji->data.jit_icall_id = MONO_JIT_ICALL_mono_threads_attach_coop;
        add_preinit_slot (acfg, ji);

        for (i = 0; i < G_N_ELEMENTS (preinited_jit_icalls); ++i) {
                ji = (MonoJumpInfo *)mono_mempool_alloc0 (acfg->mempool, sizeof (MonoJumpInfo));
                ji->type = MONO_PATCH_INFO_JIT_ICALL_ID;
                ji->data.jit_icall_id = preinited_jit_icalls [i];
                add_preinit_slot (acfg, ji);
        }

        if (acfg->aot_opts.llvm_only)
                acfg->nshared_got_entries = acfg->llvm_got_offset;
        else
                acfg->nshared_got_entries = acfg->got_offset;
        g_assert (acfg->nshared_got_entries);
}

static void
mono_dedup_log_stats (MonoAotCompile *acfg)
{
        GHashTableIter iter;
        g_assert (acfg->dedup_stats);

        if (!acfg->dedup_emit_mode)
                return;

        // If dedup_emit_mode, acfg is the dummy dedup module that consolidates
        // deduped modules
        g_hash_table_iter_init (&iter, acfg->method_to_cfg);
        MonoCompile *dcfg = NULL;
        MonoMethod *method = NULL;

        size_t wrappers_size_saved = 0;
        size_t inflated_size_saved = 0;
        size_t copied_singles = 0;
        int wrappers_saved = 0;
        int instances_saved = 0;
        int copied = 0;

        while (g_hash_table_iter_next (&iter, (gpointer *) &method, (gpointer *)&dcfg)) {
                gchar *dedup_name = mono_aot_get_mangled_method_name (method);
                guint count = GPOINTER_TO_UINT(g_hash_table_lookup (acfg->dedup_stats, dedup_name));

                if (count == 0)
                        continue;

                if (acfg->dedup_emit_mode) {
                        // Size *saved* is the size due to things not emitted.
                        if (count < 2) {
                                // Just moved, didn't save space / dedup
                                copied ++;
                                copied_singles += dcfg->code_len;
                        } else if (method->wrapper_type != MONO_WRAPPER_NONE) {
                                wrappers_saved ++;
                                wrappers_size_saved += dcfg->code_len * (count - 1);
                        } else {
                                instances_saved ++;
                                inflated_size_saved += dcfg->code_len * (count - 1);
                        }
                }
                if (acfg->aot_opts.dedup) {
                        if (method->wrapper_type != MONO_WRAPPER_NONE) {
                                wrappers_saved ++;
                                wrappers_size_saved += dcfg->code_len * count;
                        } else {
                                instances_saved ++;
                                inflated_size_saved += dcfg->code_len * count;
                        }
                }
        }

        aot_printf (acfg, "Dedup Pass: Size Saved From Deduped Wrappers:\t%d methods, %zu bytes\n", wrappers_saved, wrappers_size_saved);
        aot_printf (acfg, "Dedup Pass: Size Saved From Inflated Methods:\t%d methods, %zu bytes\n", instances_saved, inflated_size_saved);
        if (acfg->dedup_emit_mode)
                aot_printf (acfg, "Dedup Pass: Size of Moved But Not Deduped (only 1 copy) Methods:\t%d methods, %zu bytes\n", copied, copied_singles);

        g_hash_table_destroy (acfg->dedup_stats);
        acfg->dedup_stats = NULL;
}

// Flush the cache to tell future calls what to skip
static void
mono_flush_method_cache (MonoAotCompile *acfg)
{
        GHashTable *method_cache = acfg->dedup_cache;
        char *filename = g_strdup_printf ("%s.dedup", acfg->image->name);
        if (!acfg->dedup_cache_changed || !acfg->aot_opts.dedup) {
                g_free (filename);
                return;
        }

        acfg->dedup_cache = NULL;

        FILE *cache = fopen (filename, "w");

        if (!cache)
                g_error ("Could not create cache at %s because of error: %s\n", filename, strerror (errno));
        
        GHashTableIter iter;
        gchar *name = NULL;
        g_hash_table_iter_init (&iter, method_cache);
        gboolean cont = TRUE;
        while (cont && g_hash_table_iter_next (&iter, (gpointer *) &name, NULL)) {
                int res = fprintf (cache, "%s\n", name);
                cont = res >= 0;
        }
        // FIXME: don't assert if error when flushing
        g_assert (cont);

        fclose (cache);
        g_free (filename);

        // The keys are all in the imageset, nothing to free
        // Values are just pointers to memory owned elsewhere, or sentinels
        g_hash_table_destroy (method_cache);
}

// Read in what has been emitted by previous invocations,
// what can be skipped
static void
mono_read_method_cache (MonoAotCompile *acfg)
{
        char *filename = g_strdup_printf ("%s.dedup", acfg->image->name);
        // Only do once, when dedup_cache is null
        if (acfg->dedup_cache)
                goto early_exit;

        if (acfg->aot_opts.dedup_include || acfg->aot_opts.dedup)
                g_assert (acfg->dedup_stats);
        
        // only in skip mode
        if (!acfg->aot_opts.dedup)
                goto early_exit;

        g_assert (acfg->dedup_cache);

        FILE *cache;
        cache = fopen (filename, "r");
        if (!cache)
                goto early_exit;

        // Since we do pointer comparisons, and it can't be allocated at
        // the address 0x1 due to alignment, we use this as a sentinel
        gpointer other_acfg_sentinel;
        other_acfg_sentinel = GINT_TO_POINTER (0x1);

        if (fseek (cache, 0L, SEEK_END))
                goto cleanup;

        size_t fileLength;
        fileLength = ftell (cache);
        g_assert (fileLength > 0);

        if (fseek (cache, 0L, SEEK_SET))
                goto cleanup;

        // Avoid thousands of new malloc entries
        // FIXME: allocate into imageset, so we don't need to free.
        // put the other mangled names there too.
        char *bulk;
        bulk = g_malloc0 (fileLength * sizeof (char));
        size_t offset;
        offset = 0;

        while (fgets (&bulk [offset], fileLength - offset, cache)) {
                // strip newline
                char *line = &bulk [offset];
                size_t len = strlen (line);
                if (len == 0)
                        break;

                if (len >= 0 && line [len] == '\n')
                        line [len] = '\0';
                offset += strlen (line) + 1;
                g_assert (fileLength >= offset);

                g_hash_table_insert (acfg->dedup_cache, line, other_acfg_sentinel);
        }

cleanup:
        fclose (cache);

early_exit:
        g_free (filename);
        return;
}

typedef struct {
        GHashTable *cache;
        GHashTable *stats;
        gboolean emit_inflated_methods;
        MonoAssembly *inflated_assembly;
} MonoAotState;

static MonoAotState *
alloc_aot_state (void) 
{
        MonoAotState *state = g_malloc (sizeof (MonoAotState));
        // FIXME: Should this own the memory?
        state->cache = g_hash_table_new (g_str_hash, g_str_equal);
        state->stats = g_hash_table_new (g_str_hash, g_str_equal);
        // Start in "collect mode"
        state->emit_inflated_methods = FALSE;
        state->inflated_assembly = NULL;
        return state;
}

static void
free_aot_state (MonoAotState *astate) 
{
        g_hash_table_destroy (astate->cache);
        g_free (astate);
}

static void
mono_add_deferred_extra_methods (MonoAotCompile *acfg, MonoAotState *astate)
{
        GHashTableIter iter;
        gchar *name = NULL;
        MonoMethod *method = NULL;

        acfg->dedup_emit_mode = TRUE;

        g_hash_table_iter_init (&iter, astate->cache);
        while (g_hash_table_iter_next (&iter, (gpointer *) &name, (gpointer *) &method)) {
                add_method_full (acfg, method, TRUE, 0);
        }
        return;
}

static void
mono_setup_dedup_state (MonoAotCompile *acfg, MonoAotState **global_aot_state, MonoAssembly *ass, MonoAotState **astate, gboolean *is_dedup_dummy) 
{
        if (!acfg->aot_opts.dedup_include && !acfg->aot_opts.dedup)
                return;

        if (global_aot_state && *global_aot_state && acfg->aot_opts.dedup_include) {
        // Thread the state through when making the inflate pass
                *astate = *global_aot_state;
        }

        if (!*astate) {
                *astate = alloc_aot_state ();
                *global_aot_state = *astate;
        }

        acfg->dedup_cache = (*astate)->cache;
        acfg->dedup_stats = (*astate)->stats;

        // fills out acfg->dedup_cache
        if (acfg->aot_opts.dedup)
                mono_read_method_cache (acfg);

        if (!(*astate)->inflated_assembly && acfg->aot_opts.dedup_include) {
                gchar **asm_path = g_strsplit (ass->image->name, G_DIR_SEPARATOR_S, 0);
                gchar *asm_file = NULL;

                // Get the last part of the path, the filename
                for (int i=0; asm_path [i] != NULL; i++)
                        asm_file = asm_path [i];

                if (!strcmp (acfg->aot_opts.dedup_include, asm_file)) {
                        // Save
                        *is_dedup_dummy = TRUE;
                        (*astate)->inflated_assembly = ass;
                }
                g_strfreev (asm_path);
        } else if ((*astate)->inflated_assembly) {
                *is_dedup_dummy = (ass == (*astate)->inflated_assembly);
        }
}

int 
mono_compile_deferred_assemblies (guint32 opts, const char *aot_options, gpointer **aot_state)
{
        // create assembly, loop and add extra_methods
        // in add_generic_instances , rip out what's in that for loop
        // and apply that to this aot_state inside of mono_compile_assembly
        MonoAotState *astate;
        astate = *(MonoAotState **)aot_state;
        g_assert (astate);

        // FIXME: allow suffixes?
        if (!astate->inflated_assembly) {
                const char* inflate = strstr (aot_options, "dedup-inflate");
                if (!inflate)
                        return 0;
                else 
                        g_error ("Error: mono was not given an assembly with the provided inflate name\n");
        }

        // Switch modes
        astate->emit_inflated_methods = TRUE;

        int res = mono_compile_assembly (astate->inflated_assembly, opts, aot_options, aot_state);

        *aot_state = NULL;
        free_aot_state (astate);

        return res;
}

#ifndef MONO_ARCH_HAVE_INTERP_ENTRY_TRAMPOLINE
static MonoMethodSignature * const * const interp_in_static_sigs [] = {
    &mono_icall_sig_bool_ptr_int32_ptrref,
    &mono_icall_sig_bool_ptr_ptrref,
    &mono_icall_sig_int32_int32_ptrref,
    &mono_icall_sig_int32_int32_ptr_ptrref,
    &mono_icall_sig_int32_ptr_int32_ptr,
    &mono_icall_sig_int32_ptr_int32_ptrref,
    &mono_icall_sig_int32_ptr_ptrref,
    &mono_icall_sig_object_object_ptr_ptr_ptr,
    &mono_icall_sig_object,
    &mono_icall_sig_ptr_int32_ptrref,
    &mono_icall_sig_ptr_ptr_int32_ptr_ptr_ptrref,
    &mono_icall_sig_ptr_ptr_int32_ptr_ptrref,
    &mono_icall_sig_ptr_ptr_int32_ptrref,
    &mono_icall_sig_ptr_ptr_ptr_int32_ptrref,
    &mono_icall_sig_ptr_ptr_ptr_ptrref_ptrref,
    &mono_icall_sig_ptr_ptr_ptr_ptr_ptrref,
    &mono_icall_sig_ptr_ptr_ptr_ptrref,
    &mono_icall_sig_ptr_ptr_ptrref,
    &mono_icall_sig_ptr_ptr_uint32_ptrref,
    &mono_icall_sig_ptr_uint32_ptrref,
    &mono_icall_sig_void_object_ptr_ptr_ptr,
    &mono_icall_sig_void_ptr_ptr_int32_ptr_ptrref_ptr_ptrref,
    &mono_icall_sig_void_ptr_ptr_int32_ptr_ptrref,
    &mono_icall_sig_void_ptr_ptr_ptrref,
    &mono_icall_sig_void_ptr_ptrref,
    &mono_icall_sig_void_ptr,
    &mono_icall_sig_void_int32_ptrref,
    &mono_icall_sig_void_uint32_ptrref,
    &mono_icall_sig_void,
};
#else
// Common signatures for which we use interp in wrappers even in fullaot + trampolines mode
// for increased performance
static MonoMethodSignature *const * const interp_in_static_common_sigs [] = {
        &mono_icall_sig_void,
        &mono_icall_sig_ptr,
        &mono_icall_sig_void_ptr,
        &mono_icall_sig_ptr_ptr,
        &mono_icall_sig_void_ptr_ptr,
        &mono_icall_sig_ptr_ptr_ptr,
        &mono_icall_sig_void_ptr_ptr_ptr,
        &mono_icall_sig_ptr_ptr_ptr_ptr,
        &mono_icall_sig_void_ptr_ptr_ptr_ptr,
        &mono_icall_sig_ptr_ptr_ptr_ptr_ptr,
        &mono_icall_sig_void_ptr_ptr_ptr_ptr_ptr,
        &mono_icall_sig_ptr_ptr_ptr_ptr_ptr_ptr,
        &mono_icall_sig_void_ptr_ptr_ptr_ptr_ptr_ptr,
        &mono_icall_sig_ptr_ptr_ptr_ptr_ptr_ptr_ptr,
};
#endif

static void
add_interp_in_wrapper_for_sig (MonoAotCompile *acfg, MonoMethodSignature *sig)
{
        MonoMethod *wrapper;

        sig = mono_metadata_signature_dup_full (mono_get_corlib (), sig);
        sig->pinvoke = FALSE;
        wrapper = mini_get_interp_in_wrapper (sig);
        add_method (acfg, wrapper);
}

int
mono_compile_assembly (MonoAssembly *ass, guint32 opts, const char *aot_options, gpointer **global_aot_state)
{
        MonoImage *image = ass->image;
        int res;
        MonoAotCompile *acfg;
        char *p;
        TV_DECLARE (atv);
        TV_DECLARE (btv);

        acfg = acfg_create (ass, opts);

        memset (&acfg->aot_opts, 0, sizeof (acfg->aot_opts));
        acfg->aot_opts.write_symbols = TRUE;
        acfg->aot_opts.ntrampolines = 4096;
        acfg->aot_opts.nrgctx_trampolines = 4096;
        acfg->aot_opts.nimt_trampolines = 512;
        acfg->aot_opts.nrgctx_fetch_trampolines = 128;
        acfg->aot_opts.ngsharedvt_arg_trampolines = 512;
#ifdef MONO_ARCH_HAVE_FTNPTR_ARG_TRAMPOLINE
        acfg->aot_opts.nftnptr_arg_trampolines = 128;
#endif
        acfg->aot_opts.nunbox_arbitrary_trampolines = 256;
        if (!acfg->aot_opts.llvm_path)
                acfg->aot_opts.llvm_path = g_strdup ("");
        acfg->aot_opts.temp_path = g_strdup ("");
#ifdef MONOTOUCH
        acfg->aot_opts.use_trampolines_page = TRUE;
#endif
        acfg->aot_opts.clangxx = g_strdup ("clang++");

        mono_aot_parse_options (aot_options, &acfg->aot_opts);

        // start dedup
        MonoAotState *astate = NULL;
        gboolean is_dedup_dummy = FALSE;
        mono_setup_dedup_state (acfg, (MonoAotState **) global_aot_state, ass, &astate, &is_dedup_dummy);

        // Process later
        if (is_dedup_dummy && astate && !astate->emit_inflated_methods)
                return 0; 

        if (acfg->aot_opts.dedup_include && !is_dedup_dummy)
                acfg->dedup_collect_only = TRUE;
        // end dedup

        if (acfg->aot_opts.logfile) {
                acfg->logfile = fopen (acfg->aot_opts.logfile, "a+");
        }

        if (acfg->aot_opts.data_outfile) {
                acfg->data_outfile = fopen (acfg->aot_opts.data_outfile, "w+");
                if (!acfg->data_outfile) {
                        aot_printerrf (acfg, "Unable to create file '%s': %s\n", acfg->aot_opts.data_outfile, strerror (errno));
                        return 1;
                }
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_SEPARATE_DATA);
        }

        //acfg->aot_opts.print_skipped_methods = TRUE;

#if !defined(MONO_ARCH_GSHAREDVT_SUPPORTED)
        if (acfg->opts & MONO_OPT_GSHAREDVT) {
                aot_printerrf (acfg, "-O=gsharedvt not supported on this platform.\n");
                return 1;
        }
        if (acfg->aot_opts.llvm_only) {
                aot_printerrf (acfg, "--aot=llvmonly requires a runtime that supports gsharedvt.\n");
                return 1;
        }
#else
        if (acfg->aot_opts.llvm_only || mono_aot_mode_is_full (&acfg->aot_opts) || mono_aot_mode_is_hybrid (&acfg->aot_opts))
                acfg->opts |= MONO_OPT_GSHAREDVT;
#endif

#if !defined(ENABLE_LLVM)
        if (acfg->aot_opts.llvm_only) {
                aot_printerrf (acfg, "--aot=llvmonly requires a runtime compiled with llvm support.\n");
                return 1;
        }
#endif

        if (acfg->opts & MONO_OPT_GSHAREDVT)
                mono_set_generic_sharing_vt_supported (TRUE);

        if (!acfg->dedup_collect_only)
                aot_printf (acfg, "Mono Ahead of Time compiler - compiling assembly %s\n", image->name);

        if (!acfg->aot_opts.deterministic)
                generate_aotid ((guint8*) &acfg->image->aotid);

        char *aotid = mono_guid_to_string (acfg->image->aotid);
        if (!acfg->dedup_collect_only)
                aot_printf (acfg, "AOTID %s\n", aotid);
        g_free (aotid);

#ifndef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
        if (mono_aot_mode_is_full (&acfg->aot_opts)) {
                aot_printerrf (acfg, "--aot=full is not supported on this platform.\n");
                return 1;
        }
#endif

        if (acfg->aot_opts.direct_pinvoke && !acfg->aot_opts.static_link) {
                aot_printerrf (acfg, "The 'direct-pinvoke' AOT option also requires the 'static' AOT option.\n");
                return 1;
        }

        if (acfg->aot_opts.static_link)
                acfg->aot_opts.asm_writer = TRUE;

        if (acfg->aot_opts.soft_debug) {
                mini_debug_options.mdb_optimizations = TRUE;
                mini_debug_options.gen_sdb_seq_points = TRUE;

                if (!mono_debug_enabled ()) {
                        aot_printerrf (acfg, "The soft-debug AOT option requires the --debug option.\n");
                        return 1;
                }
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_DEBUG);
        }

        if (acfg->aot_opts.try_llvm)
                acfg->aot_opts.llvm = mini_llvm_init ();

        if (mono_use_llvm || acfg->aot_opts.llvm) {
                acfg->llvm = TRUE;
                acfg->aot_opts.asm_writer = TRUE;
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_WITH_LLVM);

                if (acfg->aot_opts.soft_debug) {
                        aot_printerrf (acfg, "The 'soft-debug' option is not supported when compiling with LLVM.\n");
                        return 1;
                }

                mini_llvm_init ();

                if (acfg->aot_opts.asm_only && !acfg->aot_opts.llvm_outfile) {
                        aot_printerrf (acfg, "Compiling with LLVM and the asm-only option requires the llvm-outfile= option.\n");
                        return 1;
                }
        }

        if (mono_aot_mode_is_full (&acfg->aot_opts)) {
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_FULL_AOT);
                acfg->is_full_aot = TRUE;
        }

        if (mono_aot_mode_is_interp (&acfg->aot_opts)) {
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_INTERP);
                acfg->is_full_aot = TRUE;
        }

        if (mini_safepoints_enabled ())
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_SAFEPOINTS);

        // The methods in dedup-emit amodules must be available on runtime startup
        // Note: Only one such amodule can have this attribute
        if (astate && astate->emit_inflated_methods)
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_EAGER_LOAD);


        if (acfg->aot_opts.instances_logfile_path) {
                acfg->instances_logfile = fopen (acfg->aot_opts.instances_logfile_path, "w");
                if (!acfg->instances_logfile) {
                        aot_printerrf (acfg, "Unable to create logfile: '%s'.\n", acfg->aot_opts.instances_logfile_path);
                        return 1;
                }
        }

        if (acfg->aot_opts.profile_files) {
                GList *l;

                for (l = acfg->aot_opts.profile_files; l; l = l->next) {
                        load_profile_file (acfg, (char*)l->data);
                }
        }

        if (!(mono_aot_mode_is_interp (&acfg->aot_opts) && !mono_aot_mode_is_full (&acfg->aot_opts))) {
                for (int method_index = 0; method_index < acfg->image->tables [MONO_TABLE_METHOD].rows; ++method_index)
                        g_ptr_array_add (acfg->method_order,GUINT_TO_POINTER (method_index));
        }

        acfg->num_trampolines [MONO_AOT_TRAMP_SPECIFIC] = mono_aot_mode_is_full (&acfg->aot_opts) ? acfg->aot_opts.ntrampolines : 0;
#ifdef MONO_ARCH_GSHARED_SUPPORTED
        acfg->num_trampolines [MONO_AOT_TRAMP_STATIC_RGCTX] = mono_aot_mode_is_full (&acfg->aot_opts) ? acfg->aot_opts.nrgctx_trampolines : 0;
#endif
        acfg->num_trampolines [MONO_AOT_TRAMP_IMT] = mono_aot_mode_is_full (&acfg->aot_opts) ? acfg->aot_opts.nimt_trampolines : 0;
#ifdef MONO_ARCH_GSHAREDVT_SUPPORTED
        if (acfg->opts & MONO_OPT_GSHAREDVT)
                acfg->num_trampolines [MONO_AOT_TRAMP_GSHAREDVT_ARG] = mono_aot_mode_is_full (&acfg->aot_opts) ? acfg->aot_opts.ngsharedvt_arg_trampolines : 0;
#endif
#ifdef MONO_ARCH_HAVE_FTNPTR_ARG_TRAMPOLINE
        acfg->num_trampolines [MONO_AOT_TRAMP_FTNPTR_ARG] = mono_aot_mode_is_interp (&acfg->aot_opts) ? acfg->aot_opts.nftnptr_arg_trampolines : 0;
#endif
        acfg->num_trampolines [MONO_AOT_TRAMP_UNBOX_ARBITRARY] = mono_aot_mode_is_interp (&acfg->aot_opts) && mono_aot_mode_is_full (&acfg->aot_opts) ? acfg->aot_opts.nunbox_arbitrary_trampolines : 0;

        acfg->temp_prefix = mono_img_writer_get_temp_label_prefix (NULL);

        arch_init (acfg);

        if (mono_use_llvm || acfg->aot_opts.llvm) {
                /*
                 * Emit all LLVM code into a separate assembly/object file and link with it
                 * normally.
                 */
                if (!acfg->aot_opts.asm_only && acfg->llvm_owriter_supported) {
                        acfg->llvm_owriter = TRUE;
                } else if (acfg->aot_opts.llvm_outfile) {
                        int len = strlen (acfg->aot_opts.llvm_outfile);

                        if (len >= 2 && acfg->aot_opts.llvm_outfile [len - 2] == '.' && acfg->aot_opts.llvm_outfile [len - 1] == 'o')
                                acfg->llvm_owriter = TRUE;
                }
        }

        if (acfg->llvm && acfg->thumb_mixed)
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_LLVM_THUMB);
        if (acfg->aot_opts.llvm_only)
                acfg->flags = (MonoAotFileFlags)(acfg->flags | MONO_AOT_FILE_FLAG_LLVM_ONLY);

        acfg->assembly_name_sym = g_strdup (acfg->image->assembly->aname.name);
        /* Get rid of characters which cannot occur in symbols */
        for (p = acfg->assembly_name_sym; *p; ++p) {
                if (!(isalnum (*p) || *p == '_'))
                        *p = '_';
        }

        acfg->global_prefix = g_strdup_printf ("mono_aot_%s", acfg->assembly_name_sym);
        acfg->plt_symbol = g_strdup_printf ("%s_plt", acfg->global_prefix);
        acfg->got_symbol = g_strdup_printf ("%s_got", acfg->global_prefix);
        if (acfg->llvm) {
                acfg->llvm_got_symbol = g_strdup_printf ("%s_llvm_got", acfg->global_prefix);
                acfg->llvm_eh_frame_symbol = g_strdup_printf ("%s_eh_frame", acfg->global_prefix);
        }

        acfg->method_index = 1;

        if (mono_aot_mode_is_full (&acfg->aot_opts) || mono_aot_mode_is_hybrid (&acfg->aot_opts))
                mono_set_partial_sharing_supported (TRUE);

        if (!(mono_aot_mode_is_interp (&acfg->aot_opts) && !mono_aot_mode_is_full (&acfg->aot_opts))) {
                res = collect_methods (acfg);
                if (!res)
                        return 1;
        }

        // If we're emitting all of the inflated methods into a dummy
        // Assembly, then after extra_methods is set up, we're done
        // in this function.
        if (astate && astate->emit_inflated_methods)
                mono_add_deferred_extra_methods (acfg, astate);

        {
                GList *l;

                for (l = acfg->profile_data; l; l = l->next)
                        resolve_profile_data (acfg, (ProfileData*)l->data, ass);
                for (l = acfg->profile_data; l; l = l->next)
                        add_profile_instances (acfg, (ProfileData*)l->data);
        }

        acfg->cfgs_size = acfg->methods->len + 32;
        acfg->cfgs = g_new0 (MonoCompile*, acfg->cfgs_size);

        /* PLT offset 0 is reserved for the PLT trampoline */
        acfg->plt_offset = 1;
        add_preinit_got_slots (acfg);

#ifdef ENABLE_LLVM
        if (acfg->llvm) {
                llvm_acfg = acfg;
                LLVMModuleFlags flags = (LLVMModuleFlags)0;
#ifdef EMIT_DWARF_INFO
                flags = LLVM_MODULE_FLAG_DWARF;
#endif
#ifdef EMIT_WIN32_CODEVIEW_INFO
                flags = LLVM_MODULE_FLAG_CODEVIEW;
#endif
                if (acfg->aot_opts.static_link)
                        flags = (LLVMModuleFlags)(flags | LLVM_MODULE_FLAG_STATIC);
                if (acfg->aot_opts.llvm_only)
                        flags = (LLVMModuleFlags)(flags | LLVM_MODULE_FLAG_LLVM_ONLY);
                if (acfg->aot_opts.interp)
                        flags = (LLVMModuleFlags)(flags | LLVM_MODULE_FLAG_INTERP);
                mono_llvm_create_aot_module (acfg->image->assembly, acfg->global_prefix, acfg->nshared_got_entries, flags);

                add_lazy_init_wrappers (acfg);
                add_method (acfg, mono_marshal_get_llvm_func_wrapper (LLVM_FUNC_WRAPPER_GC_POLL));
        }
#endif

        if (mono_aot_mode_is_interp (&acfg->aot_opts) && mono_is_corlib_image (acfg->image->assembly->image)) {
                MonoMethod *wrapper = mini_get_interp_lmf_wrapper ("mono_interp_to_native_trampoline", (gpointer) mono_interp_to_native_trampoline);
                add_method (acfg, wrapper);

                wrapper = mini_get_interp_lmf_wrapper ("mono_interp_entry_from_trampoline", (gpointer) mono_interp_entry_from_trampoline);
                add_method (acfg, wrapper);

#ifndef MONO_ARCH_HAVE_INTERP_ENTRY_TRAMPOLINE
                for (int i = 0; i < G_N_ELEMENTS (interp_in_static_sigs); i++)
                        add_interp_in_wrapper_for_sig (acfg, *interp_in_static_sigs [i]);
#else
                for (int i = 0; i < G_N_ELEMENTS (interp_in_static_common_sigs); i++)
                        add_interp_in_wrapper_for_sig (acfg, *interp_in_static_common_sigs [i]);
#endif

                /* required for mixed mode */
                if (strcmp (acfg->image->assembly->aname.name, "mscorlib") == 0) {
                        add_gc_wrappers (acfg);

                        for (int i = 0; i < MONO_JIT_ICALL_count; ++i)
                                add_jit_icall_wrapper (acfg, mono_find_jit_icall_info ((MonoJitICallId)i));
                }
        }

        TV_GETTIME (atv);

        compile_methods (acfg);

        TV_GETTIME (btv);

        acfg->stats.jit_time = TV_ELAPSED (atv, btv);

        dedup_skip_methods (acfg);

        if (acfg->aot_opts.dedup_include && !is_dedup_dummy)
                /* We only collected methods from this assembly */
                return 0;

        return emit_aot_image (acfg);
}

static void
print_stats (MonoAotCompile *acfg)
{
        int i;
        gint64 all_sizes;
        char llvm_stats_msg [256];

        if (acfg->llvm && !acfg->aot_opts.llvm_only)
                sprintf (llvm_stats_msg, ", LLVM: %d (%d%%)", acfg->stats.llvm_count, acfg->stats.mcount ? (acfg->stats.llvm_count * 100) / acfg->stats.mcount : 100);
        else
                strcpy (llvm_stats_msg, "");

        all_sizes = acfg->stats.code_size + acfg->stats.method_info_size + acfg->stats.ex_info_size + acfg->stats.unwind_info_size + acfg->stats.class_info_size + acfg->stats.got_info_size + acfg->stats.offsets_size + acfg->stats.plt_size;

        aot_printf (acfg, "Code: %d(%d%%) Info: %d(%d%%) Ex Info: %d(%d%%) Unwind Info: %d(%d%%) Class Info: %d(%d%%) PLT: %d(%d%%) GOT Info: %d(%d%%) Offsets: %d(%d%%) GOT: %d, BLOB: %d\n",
                                (int)acfg->stats.code_size, (int)(acfg->stats.code_size * 100 / all_sizes),
                                (int)acfg->stats.method_info_size, (int)(acfg->stats.method_info_size * 100 / all_sizes),
                                (int)acfg->stats.ex_info_size, (int)(acfg->stats.ex_info_size * 100 / all_sizes),
                                (int)acfg->stats.unwind_info_size, (int)(acfg->stats.unwind_info_size * 100 / all_sizes),
                                (int)acfg->stats.class_info_size, (int)(acfg->stats.class_info_size * 100 / all_sizes),
                                acfg->stats.plt_size ? (int)acfg->stats.plt_size : (int)acfg->plt_offset, acfg->stats.plt_size ? (int)(acfg->stats.plt_size * 100 / all_sizes) : 0,
                                (int)acfg->stats.got_info_size, (int)(acfg->stats.got_info_size * 100 / all_sizes),
                                (int)acfg->stats.offsets_size, (int)(acfg->stats.offsets_size * 100 / all_sizes),
                                        (int)(acfg->got_offset * sizeof (target_mgreg_t)),
                                        (int)acfg->stats.blob_size);
        aot_printf (acfg, "Compiled: %d/%d (%d%%)%s, No GOT slots: %d (%d%%), Direct calls: %d (%d%%)\n",
                        acfg->stats.ccount, acfg->stats.mcount, acfg->stats.mcount ? (acfg->stats.ccount * 100) / acfg->stats.mcount : 100,
                        llvm_stats_msg,
                        acfg->stats.methods_without_got_slots, acfg->stats.mcount ? (acfg->stats.methods_without_got_slots * 100) / acfg->stats.mcount : 100,
                        acfg->stats.direct_calls, acfg->stats.all_calls ? (acfg->stats.direct_calls * 100) / acfg->stats.all_calls : 100);
        if (acfg->stats.genericcount)
                aot_printf (acfg, "%d methods failed gsharing (%d%%)\n", acfg->stats.genericcount, acfg->stats.mcount ? (acfg->stats.genericcount * 100) / acfg->stats.mcount : 100);
        if (acfg->stats.abscount)
                aot_printf (acfg, "%d methods contain absolute addresses (%d%%)\n", acfg->stats.abscount, acfg->stats.mcount ? (acfg->stats.abscount * 100) / acfg->stats.mcount : 100);
        if (acfg->stats.lmfcount)
                aot_printf (acfg, "%d methods contain lmf pointers (%d%%)\n", acfg->stats.lmfcount, acfg->stats.mcount ? (acfg->stats.lmfcount * 100) / acfg->stats.mcount : 100);
        if (acfg->stats.ocount)
                aot_printf (acfg, "%d methods have other problems (%d%%)\n", acfg->stats.ocount, acfg->stats.mcount ? (acfg->stats.ocount * 100) / acfg->stats.mcount : 100);

        aot_printf (acfg, "GOT slot distribution:\n");
        int nslots = 0;
        int size = 0;
        for (i = 0; i < MONO_PATCH_INFO_NUM; ++i) {
                nslots += acfg->stats.got_slot_types [i];
                size += acfg->stats.got_slot_info_sizes [i];
                if (acfg->stats.got_slot_types [i])
                        aot_printf (acfg, "\t%s: %d (%d)\n", get_patch_name (i), acfg->stats.got_slot_types [i], acfg->stats.got_slot_info_sizes [i]);
        }
        aot_printf (acfg, "GOT SLOTS: %d, INFO SIZE: %d\n", nslots, size);

        aot_printf (acfg, "\nEncoding stats:\n");
        aot_printf (acfg, "\tMethod ref: %d (%dk)\n", acfg->stats.method_ref_count, acfg->stats.method_ref_size / 1024);
        aot_printf (acfg, "\tClass ref: %d (%dk)\n", acfg->stats.class_ref_count, acfg->stats.class_ref_size / 1024);
        aot_printf (acfg, "\tGinst: %d (%dk)\n", acfg->stats.ginst_count, acfg->stats.ginst_size / 1024);

        aot_printf (acfg, "\nMethod stats:\n");
        aot_printf (acfg, "\tNormal:    %d\n", acfg->stats.method_categories [METHOD_CAT_NORMAL]);
        aot_printf (acfg, "\tInstance:  %d\n", acfg->stats.method_categories [METHOD_CAT_INST]);
        aot_printf (acfg, "\tGSharedvt: %d\n", acfg->stats.method_categories [METHOD_CAT_GSHAREDVT]);
        aot_printf (acfg, "\tWrapper:   %d\n", acfg->stats.method_categories [METHOD_CAT_WRAPPER]);

        if (acfg->aot_opts.dedup || acfg->dedup_emit_mode)
                mono_dedup_log_stats (acfg);
}

static void
create_depfile (MonoAotCompile *acfg)
{
        FILE *depfile;

        // FIXME: Support other configurations
        g_assert (acfg->aot_opts.llvm_only && acfg->aot_opts.asm_only && acfg->aot_opts.llvm_outfile);

        depfile = fopen (acfg->aot_opts.depfile, "w");
        g_assert (depfile);

        int ntargets = 1;
        char **targets = g_new0 (char*, ntargets);
        targets [0] = acfg->aot_opts.llvm_outfile;
        for (int tindex = 0; tindex < ntargets; ++tindex) {
                fprintf (depfile, "%s: ", targets [tindex]);
                for (int i = 0; i < acfg->image_table->len; i++) {
                        MonoImage *image = (MonoImage*)g_ptr_array_index (acfg->image_table, i);
                        fprintf (depfile, " %s", image->filename);
                }
                fprintf (depfile, "\n");
        }
        g_free (targets);
        fclose (depfile);
}

static int
emit_aot_image (MonoAotCompile *acfg)
{
        int i, res;
        TV_DECLARE (atv);
        TV_DECLARE (btv);

        TV_GETTIME (atv);

#ifdef ENABLE_LLVM
        if (acfg->llvm) {
                if (acfg->aot_opts.asm_only) {
                        if (acfg->aot_opts.outfile) {
                                acfg->tmpfname = g_strdup_printf ("%s", acfg->aot_opts.outfile);
                                acfg->tmpbasename = g_strdup (acfg->tmpfname);
                        } else {
                                acfg->tmpbasename = g_strdup_printf ("%s", acfg->image->name);
                                acfg->tmpfname = g_strdup_printf ("%s.s", acfg->tmpbasename);
                        }
                        g_assert (acfg->aot_opts.llvm_outfile);
                        acfg->llvm_sfile = g_strdup (acfg->aot_opts.llvm_outfile);
                        if (acfg->llvm_owriter)
                                acfg->llvm_ofile = g_strdup (acfg->aot_opts.llvm_outfile);
                        else
                                acfg->llvm_sfile = g_strdup (acfg->aot_opts.llvm_outfile);
                } else {
                        gchar *temp_path;
                        if (strcmp (acfg->aot_opts.temp_path, "") != 0) {
                                temp_path = g_strdup (acfg->aot_opts.temp_path);
                        } else {
                                temp_path = g_mkdtemp (g_strdup ("mono_aot_XXXXXX"));
                                g_assertf (temp_path, "mkdtemp failed, error = (%d) %s", errno, g_strerror (errno));
                                acfg->temp_dir_to_delete = g_strdup (temp_path);
                        }
                                
                        acfg->tmpbasename = g_build_filename (temp_path, "temp", (const char*)NULL);
                        acfg->tmpfname = g_strdup_printf ("%s.s", acfg->tmpbasename);
                        acfg->llvm_sfile = g_strdup_printf ("%s-llvm.s", acfg->tmpbasename);
                        acfg->llvm_ofile = g_strdup_printf ("%s-llvm." AS_OBJECT_FILE_SUFFIX, acfg->tmpbasename);

                        g_free (temp_path);
                }
        }
#endif

        if (acfg->aot_opts.asm_only && !acfg->aot_opts.llvm_only) {
                if (acfg->aot_opts.outfile)
                        acfg->tmpfname = g_strdup_printf ("%s", acfg->aot_opts.outfile);
                else
                        acfg->tmpfname = g_strdup_printf ("%s.s", acfg->image->name);
                acfg->fp = fopen (acfg->tmpfname, "w+");
        } else {
                if (strcmp (acfg->aot_opts.temp_path, "") == 0) {
                        int i = g_file_open_tmp ("mono_aot_XXXXXX", &acfg->tmpfname, NULL);
                        acfg->fp = fdopen (i, "w+");
                } else {
                        acfg->tmpbasename = g_build_filename (acfg->aot_opts.temp_path, "temp", (const char*)NULL);
                        acfg->tmpfname = g_strdup_printf ("%s.s", acfg->tmpbasename);
                        acfg->fp = fopen (acfg->tmpfname, "w+");
                }
        }
        if (acfg->fp == 0 && !acfg->aot_opts.llvm_only) {
                aot_printerrf (acfg, "Unable to open file '%s': %s\n", acfg->tmpfname, strerror (errno));
                return 1;
        }
        if (acfg->fp)
                acfg->w = mono_img_writer_create (acfg->fp, FALSE);

        /* Compute symbols for methods */
        for (i = 0; i < acfg->nmethods; ++i) {
                if (acfg->cfgs [i]) {
                        MonoCompile *cfg = acfg->cfgs [i];
                        int method_index = get_method_index (acfg, cfg->orig_method);

                        if (cfg->asm_symbol) {
                                // Set by method emitter in backend
                                if (acfg->llvm_label_prefix) {
                                        char *old_symbol = cfg->asm_symbol;
                                        cfg->asm_symbol = g_strdup_printf ("%s%s", acfg->llvm_label_prefix, cfg->asm_symbol);
                                        g_free (old_symbol);
                                }
                        } else if (COMPILE_LLVM (cfg)) {
                                cfg->asm_symbol = g_strdup_printf ("%s%s", acfg->llvm_label_prefix, cfg->llvm_method_name);
                        } else if (acfg->global_symbols || acfg->llvm) {
                                cfg->asm_symbol = get_debug_sym (cfg->orig_method, "", acfg->method_label_hash);
                        } else {
                                cfg->asm_symbol = g_strdup_printf ("%s%sm_%x", acfg->temp_prefix, acfg->llvm_label_prefix, method_index);
                        }
                        cfg->asm_debug_symbol = cfg->asm_symbol;
                }
        }

        if (acfg->aot_opts.dwarf_debug && acfg->aot_opts.gnu_asm) {
                /*
                 * CLANG supports GAS .file/.loc directives, so emit line number information this way
                 */
                acfg->gas_line_numbers = TRUE;
        }

#ifdef EMIT_DWARF_INFO
        if ((!acfg->aot_opts.nodebug || acfg->aot_opts.dwarf_debug) && acfg->has_jitted_code) {
                if (acfg->aot_opts.dwarf_debug && !mono_debug_enabled ()) {
                        aot_printerrf (acfg, "The dwarf AOT option requires the --debug option.\n");
                        return 1;
                }
                acfg->dwarf = mono_dwarf_writer_create (acfg->w, NULL, 0, !acfg->gas_line_numbers);
        }
#endif /* EMIT_DWARF_INFO */

        if (acfg->w)
                mono_img_writer_emit_start (acfg->w);

        if (acfg->dwarf)
                mono_dwarf_writer_emit_base_info (acfg->dwarf, g_path_get_basename (acfg->image->name), mono_unwind_get_cie_program ());

        if (acfg->aot_opts.dedup)
                mono_flush_method_cache (acfg);

        emit_code (acfg);

        emit_info (acfg);

        emit_extra_methods (acfg);

        emit_trampolines (acfg);

        emit_class_name_table (acfg);

        emit_got_info (acfg, FALSE);
        if (acfg->llvm)
                emit_got_info (acfg, TRUE);

        emit_exception_info (acfg);

        emit_unwind_info (acfg);

        emit_class_info (acfg);

        emit_plt (acfg);

        emit_image_table (acfg);

        emit_weak_field_indexes (acfg);

        emit_got (acfg);

        {
                /*
                 * The managed allocators are GC specific, so can't use an AOT image created by one GC
                 * in another.
                 */
                const char *gc_name = mono_gc_get_gc_name ();
                acfg->gc_name_offset = add_to_blob (acfg, (guint8*)gc_name, strlen (gc_name) + 1);
        }

        emit_blob (acfg);

        emit_objc_selectors (acfg);

        emit_globals (acfg);

        emit_file_info (acfg);

        if (acfg->dwarf) {
                emit_dwarf_info (acfg);
                mono_dwarf_writer_close (acfg->dwarf);
        } else {
                if (!acfg->aot_opts.nodebug)
                        emit_codeview_info (acfg);
        }

        emit_mem_end (acfg);

        if (acfg->need_pt_gnu_stack) {
                /* This is required so the .so doesn't have an executable stack */
                /* The bin writer already emits this */
                fprintf (acfg->fp, "\n.section  .note.GNU-stack,\"\",@progbits\n");
        }

        if (acfg->aot_opts.data_outfile)
                fclose (acfg->data_outfile);

#ifdef ENABLE_LLVM
        if (acfg->llvm) {
                gboolean res;

                res = emit_llvm_file (acfg);
                if (!res)
                        return 1;
        }
#endif

        emit_library_info (acfg);

        TV_GETTIME (btv);

        acfg->stats.gen_time = TV_ELAPSED (atv, btv);

        if (!acfg->aot_opts.stats)
                aot_printf (acfg, "Compiled: %d/%d\n", acfg->stats.ccount, acfg->stats.mcount);

        TV_GETTIME (atv);
        if (acfg->w) {
                res = mono_img_writer_emit_writeout (acfg->w);
                if (res != 0) {
                        acfg_free (acfg);
                        return res;
                }
                res = compile_asm (acfg);
                if (res != 0) {
                        acfg_free (acfg);
                        return res;
                }
        }
        TV_GETTIME (btv);
        acfg->stats.link_time = TV_ELAPSED (atv, btv);

        if (acfg->aot_opts.stats)
                print_stats (acfg);

        aot_printf (acfg, "JIT time: %d ms, Generation time: %d ms, Assembly+Link time: %d ms.\n", acfg->stats.jit_time / 1000, acfg->stats.gen_time / 1000, acfg->stats.link_time / 1000);

        if (acfg->aot_opts.depfile)
                create_depfile (acfg);

        if (acfg->aot_opts.dump_json)
                aot_dump (acfg);

        if (!acfg->aot_opts.save_temps && acfg->temp_dir_to_delete) {
                char *command = g_strdup_printf ("rm -r %s", acfg->temp_dir_to_delete);
                execute_system (command);
                g_free (command);
        }

        acfg_free (acfg);
        
        return 0;
}

#else

/* AOT disabled */

void*
mono_aot_readonly_field_override (MonoClassField *field)
{
        return NULL;
}

int
mono_compile_assembly (MonoAssembly *ass, guint32 opts, const char *aot_options, gpointer **aot_state)
{
        return 0;
}

gboolean
mono_aot_is_shared_got_offset (int offset)
{
        return FALSE;
}

int
mono_compile_deferred_assemblies (guint32 opts, const char *aot_options, gpointer **aot_state)
{
        g_assert_not_reached ();
        return 0;
}

gboolean
mono_aot_direct_icalls_enabled_for_method (MonoCompile *cfg, MonoMethod *method)
{
        g_assert_not_reached ();
        return 0;
}

#endif