[interp] Reduce computation under calc_section mutex

[mono-project.git] / mono / mini / mini-exceptions.c

/**
 * \file
 * generic exception support
 *
 * Authors:
 *   Dietmar Maurer (dietmar@ximian.com)
 *   Mono Team (mono-list@lists.ximian.com)
 *
 * Copyright 2001-2003 Ximian, Inc.
 * Copyright 2003-2008 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 <glib.h>
#include <string.h>

#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif

#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif

#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif

#ifdef HAVE_UNWIND_H
#include <unwind.h>
#endif

#include <mono/metadata/appdomain.h>
#include <mono/metadata/tabledefs.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/debug-helpers.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/exception-internals.h>
#include <mono/metadata/object-internals.h>
#include <mono/metadata/reflection-internals.h>
#include <mono/metadata/gc-internals.h>
#include <mono/metadata/debug-internals.h>
#include <mono/metadata/mono-debug.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/mono-endian.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/mono-mlist.h>
#include <mono/utils/mono-merp.h>
#include <mono/utils/mono-mmap.h>
#include <mono/utils/mono-logger-internals.h>
#include <mono/utils/mono-error.h>
#include <mono/utils/mono-error-internals.h>
#include <mono/utils/mono-state.h>
#include <mono/utils/mono-threads-debug.h>

#include "mini.h"
#include "trace.h"
#include "debugger-agent.h"
#include "seq-points.h"
#include "llvm-runtime.h"
#include "mini-llvm.h"
#include "aot-runtime.h"
#include "mini-runtime.h"
#include "interp/interp.h"

#ifdef ENABLE_LLVM
#include "mini-llvm-cpp.h"
#endif

#ifdef TARGET_ARM
#include "mini-arm.h"
#endif

#ifndef MONO_ARCH_CONTEXT_DEF
#define MONO_ARCH_CONTEXT_DEF
#endif

#ifndef HOST_WIN32
#include <dlfcn.h>
#endif

/*
 * Raw frame information is stored in MonoException.trace_ips as an IntPtr[].
 * This structure represents one entry.
 * This should consists of pointers only.
 */
typedef struct
{
        gpointer ip;
        gpointer generic_info;
        /* Only for interpreter frames */
        MonoJitInfo *ji;
}  ExceptionTraceIp;

/* Number of words in trace_ips belonging to one entry */
#define TRACE_IP_ENTRY_SIZE (sizeof (ExceptionTraceIp) / sizeof (gpointer))

static gpointer restore_context_func, call_filter_func;
static gpointer throw_exception_func, rethrow_exception_func, rethrow_preserve_exception_func;
static gpointer throw_corlib_exception_func;

static MonoFtnPtrEHCallback ftnptr_eh_callback;

static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data, gboolean crash_context);
static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
static gboolean mono_current_thread_has_handle_block_guard (void);
static gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx);
static void mono_uninstall_current_handler_block_guard (void);
static gboolean mono_exception_walk_trace_internal (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data);
static void throw_exception (MonoObject *ex, gboolean rethrow);

static void mono_summarize_managed_stack (MonoThreadSummary *out);
static void mono_summarize_unmanaged_stack (MonoThreadSummary *out);
static void mono_summarize_exception (MonoException *exc, MonoThreadSummary *out);
static void mono_crash_reporting_register_native_library (const char *module_path, const char *module_name);

static gboolean
first_managed (MonoStackFrameInfo *frame, MonoContext *ctx, gpointer addr)
{
        gpointer *data = (gpointer *)addr;

        if (!frame->managed)
                return FALSE;

        if (!ctx) {
                // FIXME: Happens with llvm_only
                *data = NULL;
                return TRUE;
        }

        *data = frame->frame_addr;
        g_assert (*data);
        return TRUE;
}

static gpointer
mono_thread_get_managed_sp (void)
{
        gpointer addr = NULL;
        mono_walk_stack (first_managed, MONO_UNWIND_SIGNAL_SAFE, &addr);
        return addr;
}

static inline void
mini_clear_abort_threshold (void)
{
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();
        jit_tls->abort_exc_stack_threshold = NULL;
}

static inline void
mini_set_abort_threshold (StackFrameInfo *frame)
{
        gpointer sp = frame->frame_addr;
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();
        // Only move it up, to avoid thrown/caught
        // exceptions lower in the stack from triggering
        // a rethrow
        gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;
        if (!jit_tls->abort_exc_stack_threshold || above_threshold) {
                jit_tls->abort_exc_stack_threshold = sp;
        }
}

// Note: In the case that the frame is above where the thread abort
// was set we bump the threshold so that functions called from the new,
// higher threshold don't trigger the thread abort exception
static inline gboolean
mini_above_abort_threshold (void)
{
        gpointer sp = mono_thread_get_managed_sp ();
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();

        if (!sp)
                return TRUE;

        gboolean above_threshold = (gsize) sp >= (gsize) jit_tls->abort_exc_stack_threshold;

        if (above_threshold)
                jit_tls->abort_exc_stack_threshold = sp;

        return above_threshold;
}

static int
mono_get_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset)
{
        SeqPoint sp;
        if (mono_find_prev_seq_point_for_native_offset (domain, method, native_offset, NULL, &sp))
                return sp.il_offset;
        return -1;
}

void
mono_exceptions_init (void)
{
        MonoRuntimeExceptionHandlingCallbacks cbs;
        if (mono_ee_features.use_aot_trampolines) {
                restore_context_func = mono_aot_get_trampoline ("restore_context");
                call_filter_func = mono_aot_get_trampoline ("call_filter");
                throw_exception_func = mono_aot_get_trampoline ("throw_exception");
                rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
                rethrow_preserve_exception_func = mono_aot_get_trampoline ("rethrow_preserve_exception");
        } else if (!mono_llvm_only) {
                MonoTrampInfo *info;

                restore_context_func = mono_arch_get_restore_context (&info, FALSE);
                mono_tramp_info_register (info, NULL);
                call_filter_func = mono_arch_get_call_filter (&info, FALSE);
                mono_tramp_info_register (info, NULL);
                throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
                mono_tramp_info_register (info, NULL);
                rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
                mono_tramp_info_register (info, NULL);
                rethrow_preserve_exception_func = mono_arch_get_rethrow_preserve_exception (&info, FALSE);
                mono_tramp_info_register (info, NULL);
        }

        mono_arch_exceptions_init ();

        cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
        cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
        cbs.mono_summarize_managed_stack = mono_summarize_managed_stack;
        cbs.mono_summarize_unmanaged_stack = mono_summarize_unmanaged_stack;
        cbs.mono_summarize_exception = mono_summarize_exception;
        cbs.mono_register_native_library = mono_crash_reporting_register_native_library;

        if (mono_llvm_only) {
                cbs.mono_raise_exception = mono_llvm_raise_exception;
                cbs.mono_reraise_exception = mono_llvm_reraise_exception;
        } else {
                cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
                cbs.mono_reraise_exception = (void (*)(MonoException *))mono_get_rethrow_exception ();
        }
        cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
        cbs.mono_exception_walk_trace = mono_exception_walk_trace;
        cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
        cbs.mono_uninstall_current_handler_block_guard = mono_uninstall_current_handler_block_guard;
        cbs.mono_current_thread_has_handle_block_guard = mono_current_thread_has_handle_block_guard;
        cbs.mono_clear_abort_threshold = mini_clear_abort_threshold;
        cbs.mono_above_abort_threshold = mini_above_abort_threshold;
        mono_install_eh_callbacks (&cbs);
        mono_install_get_seq_point (mono_get_seq_point_for_native_offset);
}

gpointer
mono_get_throw_exception (void)
{
        g_assert (throw_exception_func);
        return throw_exception_func;
}

gpointer
mono_get_rethrow_exception (void)
{
        g_assert (rethrow_exception_func);
        return rethrow_exception_func;
}

gpointer
mono_get_rethrow_preserve_exception (void)
{
        g_assert (rethrow_preserve_exception_func);
        return rethrow_preserve_exception_func;
}

static void
no_call_filter (void)
{
        g_assert_not_reached ();
}

gpointer
mono_get_call_filter (void)
{
        /* This is called even in llvmonly mode etc. */
        if (!call_filter_func)
                return (gpointer)no_call_filter;
        return call_filter_func;
}

gpointer
mono_get_restore_context (void)
{
        g_assert (restore_context_func);
        return restore_context_func;
}

gpointer
mono_get_throw_corlib_exception (void)
{
        gpointer code = NULL;
        MonoTrampInfo *info;

        /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
        if (throw_corlib_exception_func)
                return throw_corlib_exception_func;

        if (mono_ee_features.use_aot_trampolines)
                code = mono_aot_get_trampoline ("throw_corlib_exception");
        else {
                code = mono_arch_get_throw_corlib_exception (&info, FALSE);
                mono_tramp_info_register (info, NULL);
        }

        mono_memory_barrier ();

        throw_corlib_exception_func = code;

        return throw_corlib_exception_func;
}

/*
 * mono_get_throw_exception_addr:
 *
 *   Return an address which stores the result of
 * mono_get_throw_exception.
 */
gpointer
mono_get_throw_exception_addr (void)
{
        return &throw_exception_func;
}

gpointer
mono_get_rethrow_preserve_exception_addr (void)
{
        return &rethrow_preserve_exception_func;
}

static gboolean 
is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
{
        MonoTryBlockHoleTableJitInfo *table;
        int i;
        guint32 offset;
        guint16 clause;

        if (ei->try_start > ip || ip >= ei->try_end)
                return FALSE;

        if (!ji->has_try_block_holes)
                return TRUE;

        table = mono_jit_info_get_try_block_hole_table_info (ji);
        offset = (guint32)((char*)ip - (char*)ji->code_start);
        clause = (guint16)(ei - ji->clauses);
        g_assert (clause < ji->num_clauses);

        for (i = 0; i < table->num_holes; ++i) {
                MonoTryBlockHoleJitInfo *hole = &table->holes [i];
                if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
                        return FALSE;
        }
        return TRUE;
}

#ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE

#if 0
static gboolean show_native_addresses = TRUE;
#else
static gboolean show_native_addresses = FALSE;
#endif

static _Unwind_Reason_Code
build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
{
        MonoDomain *domain = mono_domain_get ();
        uintptr_t ip = _Unwind_GetIP (frame_ctx);

        if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
                GList **trace_ips = (GList **)state;
                *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
        }

        return _URC_NO_REASON;
}

static GSList*
get_unwind_backtrace (void)
{
        GSList *ips = NULL;

        _Unwind_Backtrace (build_stack_trace, &ips);

        return g_slist_reverse (ips);
}

#else

static GSList*
get_unwind_backtrace (void)
{
        return NULL;
}

#endif

static gboolean
arch_unwind_frame (MonoDomain *domain, MonoJitTlsData *jit_tls,
                                   MonoJitInfo *ji, MonoContext *ctx,
                                   MonoContext *new_ctx, MonoLMF **lmf,
                                   host_mgreg_t **save_locations,
                                   StackFrameInfo *frame)
{
        if (!ji && *lmf) {
                if (((gsize)(*lmf)->previous_lmf) & 2) {
                        MonoLMFExt *ext = (MonoLMFExt*)(*lmf);

                        memset (frame, 0, sizeof (StackFrameInfo));
                        frame->ji = ji;

                        *new_ctx = *ctx;

                        if (ext->kind == MONO_LMFEXT_DEBUGGER_INVOKE) {
                                /*
                                 * This LMF entry is created by the soft debug code to mark transitions to
                                 * managed code done during invokes.
                                 */
                                frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
                                memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
                        } else if (ext->kind == MONO_LMFEXT_INTERP_EXIT || ext->kind == MONO_LMFEXT_INTERP_EXIT_WITH_CTX) {
                                frame->type = FRAME_TYPE_INTERP_TO_MANAGED;
                                frame->interp_exit_data = ext->interp_exit_data;
                                if (ext->kind == MONO_LMFEXT_INTERP_EXIT_WITH_CTX) {
                                        frame->type = FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX;
                                        memcpy (new_ctx, &ext->ctx, sizeof (MonoContext));
                                }
                        } else {
                                g_assert_not_reached ();
                        }

                        *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~3);

                        return TRUE;
                }
        }

        return mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
}

/*
 * find_jit_info:
 *
 * Translate between the mono_arch_unwind_frame function and the old API.
 */
static MonoJitInfo *
find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx, 
                           MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
{
        StackFrameInfo frame;
        MonoJitInfo *ji;
        gboolean err;
        gpointer ip = MONO_CONTEXT_GET_IP (ctx);

        /* Avoid costly table lookup during stack overflow */
        if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
                ji = prev_ji;
        else
                ji = mini_jit_info_table_find (domain, ip, NULL);

        if (managed)
                *managed = FALSE;

        err = arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
        if (!err)
                return (MonoJitInfo *)-1;

        if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
                /*
                 * Remove any unused lmf.
                 * Mask out the lower bits which might be used to hold additional information.
                 */
                *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(TARGET_SIZEOF_VOID_P -1));
        }

        /* Convert between the new and the old APIs */
        switch (frame.type) {
        case FRAME_TYPE_MANAGED:
                if (managed)
                        *managed = TRUE;
                return frame.ji;
        case FRAME_TYPE_TRAMPOLINE:
                return frame.ji;
        case FRAME_TYPE_MANAGED_TO_NATIVE:
                if (frame.ji)
                        return frame.ji;
                else {
                        memset (res, 0, sizeof (MonoJitInfo));
                        res->d.method = frame.method;
                        return res;
                }
        case FRAME_TYPE_DEBUGGER_INVOKE: {
                MonoContext tmp_ctx;

                /*
                 * The normal exception handling code can't handle this frame, so just
                 * skip it.
                 */
                ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
                memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
                return ji;
        }
        default:
                g_assert_not_reached ();
                return NULL;
        }
}

/* mono_find_jit_info:
 *
 * This function is used to gather information from @ctx. It return the 
 * MonoJitInfo of the corresponding function, unwinds one stack frame and
 * stores the resulting context into @new_ctx. It also stores a string 
 * describing the stack location into @trace (if not NULL), and modifies
 * the @lmf if necessary. @native_offset return the IP offset from the 
 * start of the function or -1 if that info is not available.
 */
MonoJitInfo *
mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
                    MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
                    gboolean *managed)
{
        gboolean managed2;
        gpointer ip = MONO_CONTEXT_GET_IP (ctx);
        MonoJitInfo *ji;
        MonoMethod *method = NULL;

        if (trace)
                *trace = NULL;

        if (native_offset)
                *native_offset = -1;

        if (managed)
                *managed = FALSE;

        ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);

        if (ji == (gpointer)-1)
                return ji;

        if (ji && !ji->is_trampoline)
                method = jinfo_get_method (ji);

        if (managed2 || (method && method->wrapper_type)) {
                const char *real_ip, *start;
                gint32 offset;

                start = (const char *)ji->code_start;
                if (!managed2)
                        /* ctx->ip points into native code */
                        real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
                else
                        real_ip = (const char*)ip;

                if ((real_ip >= start) && (real_ip <= start + ji->code_size))
                        offset = real_ip - start;
                else
                        offset = -1;

                if (native_offset)
                        *native_offset = offset;

                if (managed)
                        if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
                                *managed = TRUE;

                if (trace)
                        *trace = mono_debug_print_stack_frame (method, offset, domain);
        } else {
                if (trace) {
                        char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
                        *trace = g_strdup_printf ("in (unmanaged) %s", fname);
                        g_free (fname);
                }
        }

        return ji;
}

/*
 * mono_find_jit_info_ext:
 *
 *   A version of mono_find_jit_info which returns all data in the StackFrameInfo
 * structure.
 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
 * to obtain the last managed frame.
 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
 * On return, it will be filled with the locations where callee saved registers are saved
 * by the current frame. This is returned outside of StackFrameInfo because it can be
 * quite large on some platforms.
 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
 * not be set.
 */
gboolean
mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, 
                                                MonoJitInfo *prev_ji, MonoContext *ctx,
                                                MonoContext *new_ctx, char **trace, MonoLMF **lmf,
                                                host_mgreg_t **save_locations,
                                                StackFrameInfo *frame)
{
        gboolean err;
        gpointer ip = MONO_CONTEXT_GET_IP (ctx);
        MonoJitInfo *ji;
        MonoDomain *target_domain = domain;
        MonoMethod *method = NULL;
        gboolean async = mono_thread_info_is_async_context ();

        if (trace)
                *trace = NULL;

        /* Avoid costly table lookup during stack overflow */
        if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
                ji = prev_ji;
        else
                ji = mini_jit_info_table_find_ext (domain, ip, TRUE, &target_domain);

        if (!target_domain)
                target_domain = domain;

        if (save_locations)
                memset (save_locations, 0, MONO_MAX_IREGS * sizeof (host_mgreg_t*));

        err = arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
        if (!err)
                return FALSE;

        gboolean not_i2m = frame->type != FRAME_TYPE_INTERP_TO_MANAGED && frame->type != FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX;

        if (not_i2m && *lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
                /*
                 * Remove any unused lmf.
                 * Mask out the lower bits which might be used to hold additional information.
                 */
                *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(TARGET_SIZEOF_VOID_P -1));
        }

        if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
                method = jinfo_get_method (frame->ji);

        if (frame->type == FRAME_TYPE_MANAGED && method) {
                if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
                        frame->managed = TRUE;
        }

        if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
                /*
                 * This type of frame is just a marker, the caller should unwind once more to get the
                 * last managed frame.
                 */
                frame->ji = NULL;
                frame->method = NULL;
        }

        frame->native_offset = -1;
        frame->domain = target_domain;
        frame->async_context = async;
        frame->frame_addr = MONO_CONTEXT_GET_SP (ctx);

        ji = frame->ji;

        if (frame->type == FRAME_TYPE_MANAGED)
                frame->method = method;

        if (ji && (frame->managed || (method && method->wrapper_type))) {
                const char *real_ip, *start;

                start = (const char *)ji->code_start;
                if (frame->type == FRAME_TYPE_MANAGED)
                        real_ip = (const char*)ip;
                else
                        /* ctx->ip points into native code */
                        real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);

                if ((real_ip >= start) && (real_ip <= start + ji->code_size))
                        frame->native_offset = real_ip - start;
                else {
                        frame->native_offset = -1;
                }

                if (trace)
                        *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
        } else {
                if (trace && frame->method) {
                        char *fname = mono_method_full_name (frame->method, TRUE);
                        *trace = g_strdup_printf ("in (unmanaged) %s", fname);
                        g_free (fname);
                }
        }

        return TRUE;
}

typedef struct {
        gboolean in_interp;
        MonoInterpStackIter interp_iter;
        gpointer last_frame_addr;
} Unwinder;

static void
unwinder_init (Unwinder *unwinder)
{
        memset (unwinder, 0, sizeof (Unwinder));
}

#if defined(__GNUC__) && defined(TARGET_ARM64)
/* gcc 4.9.2 seems to miscompile this on arm64 */
static __attribute__((optimize("O0"))) gboolean
#else
static gboolean
#endif
unwinder_unwind_frame (Unwinder *unwinder,
                                           MonoDomain *domain, MonoJitTlsData *jit_tls,
                                           MonoJitInfo *prev_ji, MonoContext *ctx,
                                           MonoContext *new_ctx, char **trace, MonoLMF **lmf,
                                           host_mgreg_t **save_locations,
                                           StackFrameInfo *frame)
{
        gpointer parent;
        if (unwinder->in_interp) {
                memcpy (new_ctx, ctx, sizeof (MonoContext));

                /* Process debugger invokes */
                /* The DEBUGGER_INVOKE should be returned before the first interpreter frame for the invoke */
                if (unwinder->last_frame_addr < (gpointer)(*lmf)) {
                        if (((gsize)(*lmf)->previous_lmf) & 2) {
                                MonoLMFExt *ext = (MonoLMFExt*)(*lmf);
                                if (ext->kind == MONO_LMFEXT_DEBUGGER_INVOKE) {
                                        *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~7);
                                        frame->type = FRAME_TYPE_DEBUGGER_INVOKE;
                                        return TRUE;
                                }
                        }
                }

                unwinder->in_interp = mini_get_interp_callbacks ()->frame_iter_next (&unwinder->interp_iter, frame);
                if (frame->type == FRAME_TYPE_INTERP) {
                        parent = mini_get_interp_callbacks ()->frame_get_parent (frame->interp_frame);
                        unwinder->last_frame_addr = parent;
                }
                if (!unwinder->in_interp)
                        return unwinder_unwind_frame (unwinder, domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf, save_locations, frame);
                return TRUE;
        } else {
                gboolean res = mono_find_jit_info_ext (domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf,
                                                                                           save_locations, frame);
                if (!res)
                        return FALSE;
                if (frame->type == FRAME_TYPE_INTERP_TO_MANAGED || frame->type == FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX) {
                        unwinder->in_interp = TRUE;
                        mini_get_interp_callbacks ()->frame_iter_init (&unwinder->interp_iter, frame->interp_exit_data);
                }
                unwinder->last_frame_addr = frame->frame_addr;
                return TRUE;
        }
}

/*
 * This function is async-safe.
 */
static gpointer
get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
{
        MonoGenericJitInfo *gi;
        MonoMethod *method;
        gpointer info;

        if (!ji->has_generic_jit_info)
                return NULL;
        gi = mono_jit_info_get_generic_jit_info (ji);
        if (!gi->has_this)
                return NULL;

        info = NULL;
        /*
         * Search location list if available, it contains the precise location of the
         * argument for every pc offset, even if the method was interrupted while it was in
         * its prolog.
         */
        if (gi->nlocs) {
                int offset = (gsize)MONO_CONTEXT_GET_IP (ctx) - (gsize)ji->code_start;
                int i;

                for (i = 0; i < gi->nlocs; ++i) {
                        MonoDwarfLocListEntry *entry = &gi->locations [i];

                        if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
                                if (entry->is_reg)
                                        info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
                                else
                                        info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
                                break;
                        }
                }
                g_assert (i < gi->nlocs);
        } else {
                if (gi->this_in_reg)
                        info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
                else
                        info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
                                                                                  gi->this_offset);
        }

        method = jinfo_get_method (ji);
        if (mono_method_get_context (method)->method_inst) {
                /* A MonoMethodRuntimeGenericContext* */
                return info;
        } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || m_class_is_valuetype (method->klass)) {
                /* A MonoVTable* */
                return info;
        } else {
                /* Avoid returning a managed object */
                MonoObject *this_obj = (MonoObject *)info;

                return this_obj->vtable;
        }
}

/*
 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
 */
static MonoGenericContext
get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
        MonoGenericContext context = { NULL, NULL };
        MonoClass *klass, *method_container_class;
        MonoMethod *method;

        g_assert (generic_info);

        method = jinfo_get_method (ji);
        g_assert (method->is_inflated);
        if (mono_method_get_context (method)->method_inst) {
                MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;

                klass = mrgctx->class_vtable->klass;
                context.method_inst = mrgctx->method_inst;
                g_assert (context.method_inst);
        } else {
                MonoVTable *vtable = (MonoVTable *)generic_info;

                klass = vtable->klass;
        }

        //g_assert (!mono_class_is_gtd (method->klass));
        if (mono_class_is_ginst (method->klass))
                method_container_class = mono_class_get_generic_class (method->klass)->container_class;
        else
                method_container_class = method->klass;

        /* class might refer to a subclass of method's class */
        while (!(klass == method->klass || (mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->container_class == method_container_class))) {
                klass = m_class_get_parent (klass);
                g_assert (klass);
        }

        if (mono_class_is_ginst (klass) || mono_class_is_gtd (klass))
                context.class_inst = mini_class_get_context (klass)->class_inst;

        if (mono_class_is_ginst (klass))
                g_assert (mono_class_has_parent_and_ignore_generics (mono_class_get_generic_class (klass)->container_class, method_container_class));
        else
                g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));

        return context;
}

static MonoMethod*
get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
{
        ERROR_DECL (error);
        MonoGenericContext context;
        MonoMethod *method;
        
        if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
                return jinfo_get_method (ji);
        context = get_generic_context_from_stack_frame (ji, generic_info);

        method = jinfo_get_method (ji);
        method = mono_method_get_declaring_generic_method (method);
        method = mono_class_inflate_generic_method_checked (method, &context, error);
        g_assert (mono_error_ok (error)); /* FIXME don't swallow the error */

        return method;
}

/**
 * mono_exception_walk_native_trace:
 * \param ex The exception object whose frames should be walked
 * \param func callback to call for each stack frame
 * \param user_data data passed to the callback
 * This function walks the stacktrace of an exception. For
 * each frame the callback function is called with the relevant info.
 * The walk ends when no more stack frames are found or when the callback
 * returns a TRUE value.
 */
 
gboolean
mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
        gboolean res;

        MONO_ENTER_GC_UNSAFE;
        res = mono_exception_walk_trace_internal (ex, func, user_data);
        MONO_EXIT_GC_UNSAFE;
        return res;
}

static gboolean
mono_exception_stackframe_obj_walk (MonoStackFrame *captured_frame, MonoExceptionFrameWalk func, gpointer user_data)
{
        if (!captured_frame)
                return TRUE;

        gpointer ip = (gpointer) (captured_frame->method_address + captured_frame->native_offset);
        MonoJitInfo *ji = mono_jit_info_table_find_internal (mono_domain_get (), ip, TRUE, TRUE);

        // Other domain maybe?
        if (!ji)
                return FALSE;
        MonoMethod *method = jinfo_get_method (ji);

        gboolean r = func (method, (gpointer) captured_frame->method_address, captured_frame->native_offset, TRUE, user_data);
        if (r)
                return TRUE;

        return FALSE;
}

static gboolean
mono_exception_stacktrace_obj_walk (MonoStackTrace *st, MonoExceptionFrameWalk func, gpointer user_data)
{
        int num_captured = st->captured_traces ? mono_array_length_internal (st->captured_traces) : 0;
        for (int i=0; i < num_captured; i++) {
                MonoStackTrace *curr_trace = mono_array_get_fast (st->captured_traces, MonoStackTrace *, i);
                mono_exception_stacktrace_obj_walk (curr_trace, func, user_data);
        }

        int num_frames = st->frames ? mono_array_length_internal (st->frames) : 0;
        for (int frame = 0; frame < num_frames; frame++) {
                gboolean r = mono_exception_stackframe_obj_walk (mono_array_get_fast (st->frames, MonoStackFrame *, frame), func, user_data);
                if (r)
                        return TRUE;
        }

        return TRUE;
}

gboolean
mono_exception_walk_trace_internal (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
{
        MONO_REQ_GC_UNSAFE_MODE;

        MonoDomain *domain = mono_domain_get ();
        MonoArray *ta = ex->trace_ips;

        /* Exception is not thrown yet */
        if (ta == NULL)
                return FALSE;

        int len = mono_array_length_internal (ta) / TRACE_IP_ENTRY_SIZE;
        gboolean otherwise_has_traces = len > 0;

        for (int i = 0; i < len; i++) {
                ExceptionTraceIp trace_ip;

                memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
                gpointer ip = trace_ip.ip;
                gpointer generic_info = trace_ip.generic_info;

                MonoJitInfo *ji = NULL;
                if (trace_ip.ji) {
                        ji = trace_ip.ji;
                } else {
                        ji = mono_jit_info_table_find (domain, ip);
                }

                if (ji == NULL) {
                        gboolean r;
                        MONO_ENTER_GC_SAFE;
                        r = func (NULL, ip, 0, FALSE, user_data);
                        MONO_EXIT_GC_SAFE;
                        if (r)
                                break;
                } else {
                        MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
                        if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
                                break;
                }
        }

        ta = (MonoArray *) ex->captured_traces;
        len = ta ? mono_array_length_internal (ta) : 0;
        gboolean captured_has_traces = len > 0;

        for (int i = 0; i < len; i++) {
                MonoStackTrace *captured_trace = mono_array_get_fast (ta, MonoStackTrace *, i);
                if (!captured_trace)
                        break;

                mono_exception_stacktrace_obj_walk (captured_trace, func, user_data);
        }

        return captured_has_traces || otherwise_has_traces;
}

MonoArray *
ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
{
        ERROR_DECL (error);
        MonoDomain *domain = mono_domain_get ();
        MonoArray *res;
        MonoArray *ta = exc->trace_ips;
        MonoDebugSourceLocation *location;
        int i, len;

        if (ta == NULL) {
                /* Exception is not thrown yet */
                res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, error);
                mono_error_set_pending_exception (error);
                return res;
        }

        len = mono_array_length_internal (ta) / TRACE_IP_ENTRY_SIZE;

        res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, error);
        if (mono_error_set_pending_exception (error))
                return NULL;

        for (i = skip; i < len; i++) {
                MonoJitInfo *ji;
                MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, error);
                if (!mono_error_ok (error)) {
                        mono_error_set_pending_exception (error);
                        return NULL;
                }
                ExceptionTraceIp trace_ip;
                memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
                gpointer ip = trace_ip.ip;
                gpointer generic_info = trace_ip.generic_info;
                MonoMethod *method;

                if (trace_ip.ji) {
                        ji = trace_ip.ji;
                } else {
                        ji = mono_jit_info_table_find (domain, ip);
                        if (ji == NULL) {
                                /* Unmanaged frame */
                                mono_array_setref_internal (res, i, sf);
                                continue;
                        }
                }

                g_assert (ji != NULL);

                if (mono_llvm_only || !generic_info)
                        /* Can't resolve actual method */
                        method = jinfo_get_method (ji);
                else
                        method = get_method_from_stack_frame (ji, generic_info);
                if (jinfo_get_method (ji)->wrapper_type) {
                        char *s;

                        sf->method = NULL;
                        s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
                        MonoString *name = mono_string_new_checked (domain, s, error);
                        g_free (s);
                        if (!is_ok (error)) {
                                mono_error_set_pending_exception (error);
                                return NULL;
                        }
                        MONO_OBJECT_SETREF_INTERNAL (sf, internal_method_name, name);
                }
                else {
                        MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, error);
                        if (!mono_error_ok (error)) {
                                mono_error_set_pending_exception (error);
                                return NULL;
                        }
                        MONO_OBJECT_SETREF_INTERNAL (sf, method, rm);
                }

                sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
                sf->method_address = (gsize) ji->code_start;
                sf->native_offset = (char *)ip - (char *)ji->code_start;

                /*
                 * mono_debug_lookup_source_location() returns both the file / line number information
                 * and the IL offset.  Note that computing the IL offset is already an expensive
                 * operation, so we shouldn't call this method twice.
                 */
                location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
                if (location) {
                        sf->il_offset = location->il_offset;
                } else {
                        SeqPoint sp;
                        if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
                                sf->il_offset = sp.il_offset;
                        else
                                sf->il_offset = -1;
                }

                if (need_file_info) {
                        if (location && location->source_file) {
                                MonoString *filename = mono_string_new_checked (domain, location->source_file, error);
                                if (!is_ok (error)) {
                                        mono_error_set_pending_exception (error);
                                        return NULL;
                                }
                                MONO_OBJECT_SETREF_INTERNAL (sf, filename, filename);
                                sf->line = location->row;
                                sf->column = location->column;
                        } else {
                                sf->line = sf->column = 0;
                                sf->filename = NULL;
                        }
                }

                mono_debug_free_source_location (location);
                mono_array_setref_internal (res, i, sf);
        }

        return res;
}

static void
mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
{
        if (!start_ctx) {
                MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
                if (jit_tls && jit_tls->orig_ex_ctx_set)
                        start_ctx = &jit_tls->orig_ex_ctx;
        }
        mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
}
/**
 * mono_walk_stack_with_ctx:
 * Unwind the current thread starting at \p start_ctx.
 * If \p start_ctx is null, we capture the current context.
 */
void
mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
{
        MonoContext extra_ctx;
        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
        MONO_ARCH_CONTEXT_DEF

        if (!thread || !thread->jit_data)
                return;

        if (!start_ctx) {
                mono_arch_flush_register_windows ();
                MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
                start_ctx = &extra_ctx;
        }

        mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data, FALSE);
}

/**
 * mono_walk_stack_with_state:
 * Unwind a thread described by \p state.
 *
 * State must be valid (state->valid == TRUE).
 *
 * If you are using this function to unwind another thread, make sure it is suspended.
 * 
 * If \p state is null, we capture the current context.
 */
void
mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
{
        MonoThreadUnwindState extra_state;
        if (!state) {
                g_assert (!mono_thread_info_is_async_context ());
                if (!mono_thread_state_init_from_current (&extra_state))
                        return;
                state = &extra_state;
        }

        g_assert (state->valid);

        if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
                /* Not attached */
                return;

        mono_walk_stack_full (func,
                &state->ctx, 
                (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
                (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
                (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
                unwind_options, user_data, FALSE);
}

void
mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
{
        MonoThreadUnwindState state;
        if (!mono_thread_state_init_from_current (&state))
                return;
        mono_walk_stack_with_state (func, &state, options, user_data);
}

/**
 * mono_walk_stack_full:
 * \param func callback to call for each stack frame
 * \param domain starting appdomain, can be NULL to use the current domain
 * \param unwind_options what extra information the unwinder should gather
 * \param start_ctx starting state of the stack walk, can be NULL.
 * \param thread the thread whose stack to walk, can be NULL to use the current thread
 * \param lmf the LMF of \p thread, can be NULL to use the LMF of the current thread
 * \param user_data data passed to the callback
 * \param crash_context tells us that we're in a context where it's not safe to lock or allocate
 * This function walks the stack of a thread, starting from the state
 * represented by \p start_ctx. For each frame the callback
 * function is called with the relevant info. The walk ends when no more
 * managed stack frames are found or when the callback returns a TRUE value.
 */
static void
mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data, gboolean crash_context)
{
        gint il_offset;
        MonoContext ctx, new_ctx;
        StackFrameInfo frame;
        gboolean res;
        host_mgreg_t *reg_locations [MONO_MAX_IREGS];
        host_mgreg_t *new_reg_locations [MONO_MAX_IREGS];
        gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
        gboolean async = mono_thread_info_is_async_context ();
        Unwinder unwinder;

        memset (&frame, 0, sizeof (StackFrameInfo));

#ifndef TARGET_WASM
        if (mono_llvm_only) {
                GSList *l, *ips;

                if (async)
                        return;

                ips = get_unwind_backtrace ();
                for (l = ips; l; l = l->next) {
                        guint8 *ip = (guint8*)l->data;
                        memset (&frame, 0, sizeof (StackFrameInfo));
                        frame.ji = mini_jit_info_table_find (domain, ip, &frame.domain);
                        if (!frame.ji || frame.ji->is_trampoline)
                                continue;
                        frame.type = FRAME_TYPE_MANAGED;
                        frame.method = jinfo_get_method (frame.ji);
                        // FIXME: Cannot lookup the actual method
                        frame.actual_method = frame.method;
                        if (frame.type == FRAME_TYPE_MANAGED) {
                                if (!frame.method->wrapper_type || frame.method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
                                        frame.managed = TRUE;
                        }
                        frame.native_offset = ip - (guint8*)frame.ji->code_start;
                        frame.il_offset = -1;

                        if (func (&frame, NULL, user_data))
                                break;
                }
                g_slist_free (ips);
                return;
        }
#endif

        if (!start_ctx) {
                g_warning ("start_ctx required for stack walk");
                return;
        }

        if (!domain) {
                g_warning ("domain required for stack walk");
                return;
        }

        if (!jit_tls) {
                g_warning ("jit_tls required for stack walk");
                return;
        }

        /*The LMF will be null if the target have no managed frames.*/
        /* g_assert (lmf); */
        if (async && (unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD)) {
                g_warning ("async && (unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) not legal");
                return;
        }

        memcpy (&ctx, start_ctx, sizeof (MonoContext));
        memset (reg_locations, 0, sizeof (reg_locations));

        unwinder_init (&unwinder);

        while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
                frame.lmf = lmf;
                res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
                if (!res)
                        return;

                if (frame.type == FRAME_TYPE_TRAMPOLINE)
                        goto next;

                if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
                        MonoDebugSourceLocation *source = NULL;

                        // Don't do this when we can be in a signal handler
                        if (!crash_context)
                                source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
                        if (source) {
                                il_offset = source->il_offset;
                        } else {
                                MonoSeqPointInfo *seq_points = NULL;

                                // It's more reliable to look into the global cache if possible
                                if (crash_context)
                                        seq_points = (MonoSeqPointInfo *) frame.ji->seq_points;
                                else
                                        seq_points = mono_get_seq_points (domain, jinfo_get_method (frame.ji));

                                SeqPoint sp;
                                if (seq_points && mono_seq_point_find_prev_by_native_offset (seq_points, frame.native_offset, &sp))
                                        il_offset = sp.il_offset;
                                else
                                        il_offset = -1;
                        }
                        mono_debug_free_source_location (source);
                } else
                        il_offset = -1;

                frame.il_offset = il_offset;

                if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
                        frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
                } else {
                        frame.actual_method = frame.method;
                }

                if (get_reg_locations)
                        frame.reg_locations = reg_locations;

                if (func (&frame, &ctx, user_data))
                        return;

next:
                if (get_reg_locations) {
                        for (int i = 0; i < MONO_MAX_IREGS; ++i)
                                if (new_reg_locations [i])
                                        reg_locations [i] = new_reg_locations [i];
                }
                
                ctx = new_ctx;
        }
}

#ifdef DISABLE_CRASH_REPORTING

static void 
mono_summarize_managed_stack (MonoThreadSummary *out)
{
        return;
}

static void 
mono_summarize_unmanaged_stack (MonoThreadSummary *out)
{
        return;
}

static void
mono_summarize_exception (MonoException *exc, MonoThreadSummary *out)
{
        return;
}

static void
mono_crash_reporting_register_native_library (const char *module_path, const char *module_name)
{
        return;
}


#else

typedef struct {
        MonoFrameSummary *frames;
        int num_frames;
        int max_frames;
        MonoStackHash *hashes;
        const char *error;
} MonoSummarizeUserData;

static void
copy_summary_string_safe (char *in, const char *out)
{
        for (int i=0; i < MONO_MAX_SUMMARY_NAME_LEN; i++) {
                in [i] = out [i];
                if (out [i] == '\0')
                        return;
        }

        // Overflowed
        in [MONO_MAX_SUMMARY_NAME_LEN] = '\0';
        return;
}

typedef struct {
        char *suffix;
        char *exported_name;
} MonoLibWhitelistEntry;

static GList *native_library_whitelist;

static void
mono_crash_reporting_register_native_library (const char *module_path, const char *module_name)
{
        // Examples: libsystem_pthread.dylib -> "pthread"
        // Examples: libsystem_platform.dylib -> "platform"
        // Examples: mono-sgen -> "mono" from above line
        MonoLibWhitelistEntry *entry = g_new0 (MonoLibWhitelistEntry, 1);
        entry->suffix = g_strdup (module_path);
        entry->exported_name = g_strdup (module_name);
        native_library_whitelist = g_list_append (native_library_whitelist, entry);
}

static gboolean
check_whitelisted_module (const char *in_name, const char **out_module)
{
#ifndef MONO_PRIVATE_CRASHES
                return TRUE;
#else
        if (g_str_has_suffix (in_name, "mono-sgen")) {
                if (out_module)
                        *out_module = "mono";
                return TRUE;
        }

        for (GList *cursor = native_library_whitelist; cursor; cursor = cursor->next) {
                MonoLibWhitelistEntry *iter = (MonoLibWhitelistEntry *) cursor->data;
                if (!g_str_has_suffix (in_name, iter->suffix))
                        continue;
                if (out_module)
                        *out_module = iter->exported_name;
                return TRUE;
        }

        return FALSE;
#endif
}

static intptr_t
mono_make_portable_ip (intptr_t in_ip, intptr_t module_base)
{
        // FIXME: Make generalize away from llvm tools?
        // So lldb starts the pointer base at 0x100000000
        // and expects to get pointers as (offset + constant)
        //
        // Quirk shared by:
        // /usr/bin/symbols  -- symbols version:                        @(#)PROGRAM:symbols  PROJECT:SamplingTools-63501
        // *CoreSymbolicationDT.framework version:      63750*/
        intptr_t offset = in_ip - module_base;
        intptr_t magic_value = offset + 0x100000000;
        return magic_value;
}

static gboolean
mono_get_portable_ip (intptr_t in_ip, intptr_t *out_ip, gint32 *out_offset, const char **out_module, char *out_name)
{
        // Note: it's not safe for us to be interrupted while inside of dl_addr, because if we
        // try to call dl_addr while interrupted while inside the lock, we will try to take a
        // non-recursive lock twice on this thread, and will deadlock.
        Dl_info info;
        gboolean success = dladdr ((void*)in_ip, &info);
        if (!success)
                return FALSE;

        if (!check_whitelisted_module (info.dli_fname, out_module))
                return FALSE;

        *out_ip = mono_make_portable_ip ((intptr_t) info.dli_saddr, (intptr_t) info.dli_fbase);
        *out_offset = in_ip - (intptr_t) info.dli_saddr;

#ifndef MONO_PRIVATE_CRASHES
        if (info.dli_saddr && out_name)
                copy_summary_string_safe (out_name, info.dli_sname);
#endif
        return TRUE;
}

static guint64
summarize_offset_free_hash (guint64 accum, MonoFrameSummary *frame)
{
        if (!frame->is_managed)
                return accum;

        // See: mono_ptrarray_hash
        guint64 hash_accum = accum;

        // The assembly and the method token, no offsets
        hash_accum += mono_metadata_str_hash (frame->str_descr);
        hash_accum += frame->managed_data.token;

        return hash_accum;
}

static guint64
summarize_offset_rich_hash (guint64 accum, MonoFrameSummary *frame)
{
        // See: mono_ptrarray_hash
        guint64 hash_accum = accum;

        if (!frame->is_managed) {
                hash_accum += frame->unmanaged_data.ip;
        } else {
                hash_accum += mono_metadata_str_hash (frame->str_descr);
                hash_accum += frame->managed_data.token;
                hash_accum += frame->managed_data.il_offset;
        }

        return hash_accum;
}

static gboolean
summarize_frame_internal (MonoMethod *method, gpointer ip, size_t native_offset, int il_offset, gboolean managed, gpointer user_data)
{
        MonoSummarizeUserData *ud = (MonoSummarizeUserData *) user_data;

        gboolean valid_state = ud->num_frames + 1 < ud->max_frames;
        if (!valid_state) {
                ud->error = "Exceeded the maximum number of frames";
                return TRUE;
        }

        MonoFrameSummary *dest = &ud->frames [ud->num_frames];

        dest->unmanaged_data.ip = (intptr_t) ip;
        dest->is_managed = managed;

        if (!managed && method && method->wrapper_type != MONO_WRAPPER_NONE && method->wrapper_type < MONO_WRAPPER_NUM) {
                dest->is_managed = FALSE;
                dest->unmanaged_data.has_name = TRUE;
                copy_summary_string_safe (dest->str_descr, mono_wrapper_type_to_str (method->wrapper_type));
        }
        
#ifndef MONO_PRIVATE_CRASHES
        if (method)
                dest->managed_data.name = (char *) method->name;
#endif

        if (managed) {
                if (!method) {
                        ud->error = "Managed method frame, but no provided managed method";
                        return TRUE;
                }

                MonoImage *image = mono_class_get_image (method->klass);
                // Used for hashing, more stable across rebuilds than using GUID
                copy_summary_string_safe (dest->str_descr, image->assembly_name);

                dest->managed_data.guid = image->guid;

                dest->managed_data.native_offset = native_offset;
                dest->managed_data.token = method->token;
                dest->managed_data.il_offset = il_offset;

                dest->managed_data.filename = image->module_name;

                MonoDotNetHeader *header = &image->image_info->cli_header;
                dest->managed_data.image_size = header->nt.pe_image_size;

                dest->managed_data.time_date_stamp = image->time_date_stamp;

        } else {
                dest->managed_data.token = -1;
        }


        ud->hashes->offset_free_hash = summarize_offset_free_hash (ud->hashes->offset_free_hash, dest);
        ud->hashes->offset_rich_hash = summarize_offset_rich_hash (ud->hashes->offset_rich_hash, dest);

        // We return FALSE, so we're continuing walking
        // And we increment the pointer because we're done with this cell in the array
        ud->num_frames++;
        return FALSE;
}

static gboolean
summarize_frame_managed_walk (MonoMethod *method, gpointer ip, size_t frame_native_offset, gboolean managed, gpointer user_data)
{
        int il_offset = -1;

        if (managed && method) {
                MonoDebugSourceLocation *location = mono_debug_lookup_source_location (method, frame_native_offset, mono_domain_get ());
                if (location) {
                        il_offset = location->il_offset;
                        mono_debug_free_source_location (location);
                }
        }

        intptr_t portable_ip = 0;
        gint32 offset = 0;
        mono_get_portable_ip ((intptr_t) ip, &portable_ip, &offset, NULL, NULL);

        return summarize_frame_internal (method, (gpointer) portable_ip, frame_native_offset, il_offset, managed, user_data);
}


static gboolean
summarize_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
        // Don't record trampolines between managed frames
        if (frame->ji && frame->ji->is_trampoline)
                return TRUE;

        if (frame->ji && (frame->ji->is_trampoline || frame->ji->async))
                return FALSE; // Keep unwinding

        intptr_t ip = 0;
        gint32 offset = 0;
        mono_get_portable_ip ((intptr_t) MONO_CONTEXT_GET_IP (ctx), &ip, &offset, NULL, NULL);
        // Don't need to handle return status "success" because this ip is stored below only, NULL is okay

        gboolean is_managed = (frame->type == FRAME_TYPE_MANAGED || frame->type == FRAME_TYPE_INTERP);
        MonoMethod *method = NULL;
        if (frame && frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
                method = jinfo_get_method (frame->ji);

        if (is_managed)
                method = jinfo_get_method (frame->ji);

        return summarize_frame_internal (method, (gpointer) ip, offset, frame->il_offset, is_managed, data);
}

static void
mono_summarize_exception (MonoException *exc, MonoThreadSummary *out)
{
        memset (out, 0, sizeof (MonoThreadSummary));

        MonoException *inner_exc = exc;
        int exc_index = 0;

        for (exc_index = 0; exc_index < MONO_MAX_SUMMARY_EXCEPTIONS; exc_index++) {
                if (inner_exc == NULL)
                        break;

                // Set up state to walk this MonoException's stack
                MonoSummarizeUserData data;
                memset (&data, 0, sizeof (MonoSummarizeUserData));
                data.max_frames = MONO_MAX_SUMMARY_FRAMES;
                data.num_frames = 0;
                data.frames = out->exceptions [exc_index].managed_frames;

                // Accumulate all hashes from all exceptions in traveral order
                data.hashes = &out->hashes;

                mono_exception_walk_trace (inner_exc, summarize_frame_managed_walk, &data);

                // Save per-MonoException info
                out->exceptions [exc_index].managed_exc_type = inner_exc->object.vtable->klass;
                out->exceptions [exc_index].num_managed_frames = data.num_frames;

                // Continue to traverse nesting of exceptions
                inner_exc = (MonoException *) inner_exc->inner_ex;
        }

        out->num_exceptions = exc_index;
}


static void 
mono_summarize_managed_stack (MonoThreadSummary *out)
{
        MonoSummarizeUserData data;
        memset (&data, 0, sizeof (MonoSummarizeUserData));
        data.max_frames = MONO_MAX_SUMMARY_FRAMES;
        data.num_frames = 0;
        data.frames = out->managed_frames;
        data.hashes = &out->hashes;

        // FIXME: collect stack pointer for both and sort frames by SP
        // so people can see relative ordering of both managed and unmanaged frames.

        // 
        // Summarize managed stack
        // 
        mono_walk_stack_full (summarize_frame, out->ctx, out->domain, out->jit_tls, out->lmf, MONO_UNWIND_LOOKUP_IL_OFFSET, &data, TRUE);
        out->num_managed_frames = data.num_frames;

        if (data.error != NULL)
                out->error_msg = data.error;
        out->is_managed = (out->num_managed_frames != 0);
}

// Always runs on the dumped thread
static void 
mono_summarize_unmanaged_stack (MonoThreadSummary *out)
{
        MONO_ARCH_CONTEXT_DEF
        // 
        // Summarize unmanaged stack
        // 
#ifdef HAVE_BACKTRACE_SYMBOLS
        intptr_t frame_ips [MONO_MAX_SUMMARY_FRAMES];

        out->num_unmanaged_frames = backtrace ((void **)frame_ips, MONO_MAX_SUMMARY_FRAMES);

        for (int i =0; i < out->num_unmanaged_frames; ++i) {
                intptr_t ip = frame_ips [i];
                MonoFrameSummary *frame = &out->unmanaged_frames [i];

                int success = mono_get_portable_ip (ip, &frame->unmanaged_data.ip, &frame->unmanaged_data.offset, &frame->unmanaged_data.module, (char *) frame->str_descr);
                if (!success)
                        continue;

                if (out->unmanaged_frames [i].str_descr [0] != '\0')
                        out->unmanaged_frames [i].unmanaged_data.has_name = TRUE;
        }
#endif

        out->lmf = mono_get_lmf ();

        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
        out->info_addr = (intptr_t) thread;
        out->jit_tls = thread->jit_data;
        out->domain = mono_domain_get ();

        if (!out->ctx) {
                out->ctx = &out->ctx_mem;
                mono_arch_flush_register_windows ();
                MONO_INIT_CONTEXT_FROM_FUNC (out->ctx, mono_summarize_unmanaged_stack);
        }

        return;
}
#endif


MonoBoolean
ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info, 
                          MonoReflectionMethod **method, 
                          gint32 *iloffset, gint32 *native_offset,
                          MonoString **file, gint32 *line, gint32 *column)
{
        ERROR_DECL (error);
        MonoDomain *domain = mono_domain_get ();
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        MonoLMF *lmf = mono_get_lmf ();
        MonoJitInfo *ji = NULL;
        MonoContext ctx, new_ctx;
        MonoDebugSourceLocation *location;
        MonoMethod *jmethod = NULL, *actual_method;
        StackFrameInfo frame;
        gboolean res;
        Unwinder unwinder;
        int il_offset = -1;

        MONO_ARCH_CONTEXT_DEF;

        g_assert (skip >= 0);

        if (mono_llvm_only) {
                GSList *l, *ips;
                MonoDomain *frame_domain;
                guint8 *frame_ip = NULL;

                /* FIXME: Generalize this code with an interface which returns an array of StackFrame structures */
                jmethod = NULL;
                ips = get_unwind_backtrace ();
                for (l = ips; l && skip >= 0; l = l->next) {
                        guint8 *ip = (guint8*)l->data;

                        frame_ip = ip;

                        ji = mini_jit_info_table_find (mono_domain_get (), ip, &frame_domain);
                        if (!ji || ji->is_trampoline)
                                continue;

                        /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
                        jmethod = jinfo_get_method (ji);
                        if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
                                continue;
                        skip--;
                }
                g_slist_free (ips);
                if (!jmethod || !l)
                        return FALSE;
                /* No way to resolve generic instances */
                actual_method = jmethod;
                *native_offset = frame_ip - (guint8*)ji->code_start;
        } else {
                mono_arch_flush_register_windows ();
                MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);

                unwinder_init (&unwinder);

                new_ctx = ctx;
                do {
                        ctx = new_ctx;
                        res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
                        if (!res)
                                return FALSE;
                        switch (frame.type) {
                        case FRAME_TYPE_MANAGED_TO_NATIVE:
                        case FRAME_TYPE_DEBUGGER_INVOKE:
                        case FRAME_TYPE_TRAMPOLINE:
                        case FRAME_TYPE_INTERP_TO_MANAGED:
                        case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
                                continue;
                        case FRAME_TYPE_INTERP:
                        case FRAME_TYPE_MANAGED:
                                ji = frame.ji;
                                *native_offset = frame.native_offset;

                                /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
                                jmethod = jinfo_get_method (ji);
                                if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
                                        continue;
                                skip--;
                                break;
                        default:
                                g_assert_not_reached ();
                        }
                } while (skip >= 0);

                if (frame.type == FRAME_TYPE_INTERP) {
                        jmethod = frame.method;
                        actual_method = frame.actual_method;
                } else {
                        actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
                }
        }

        MonoReflectionMethod *rm = mono_method_get_object_checked (domain, actual_method, NULL, error);
        if (!mono_error_ok (error)) {
                mono_error_set_pending_exception (error);
                return FALSE;
        }
        mono_gc_wbarrier_generic_store_internal (method, (MonoObject*) rm);

        if (il_offset != -1) {
                location = mono_debug_lookup_source_location_by_il (jmethod, il_offset, domain);
        } else {
                location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
        }
        if (location)
                *iloffset = location->il_offset;
        else
                *iloffset = 0;

        if (need_file_info) {
                if (location) {
                        MonoString *filename = mono_string_new_checked (domain, location->source_file, error);
                        if (!is_ok (error)) {
                                mono_error_set_pending_exception (error);
                                return FALSE;
                        }
                        mono_gc_wbarrier_generic_store_internal (file, (MonoObject*)filename);
                        *line = location->row;
                        *column = location->column;
                } else {
                        *file = NULL;
                        *line = *column = 0;
                }
        }

        mono_debug_free_source_location (location);

        return TRUE;
}

static MonoClass*
get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
{
        ERROR_DECL (error);
        MonoClass *catch_class = ei->data.catch_class;
        MonoType *inflated_type;
        MonoGenericContext context;

        /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
        if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
                return NULL;

        if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
                return catch_class;
        context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));

        /* FIXME: we shouldn't inflate but instead put the
           type in the rgctx and fetch it from there.  It
           might be a good idea to do this lazily, i.e. only
           when the exception is actually thrown, so as not to
           waste space for exception clauses which might never
           be encountered. */
        inflated_type = mono_class_inflate_generic_type_checked (m_class_get_byval_arg (catch_class), &context, error);
        mono_error_assert_ok (error); /* FIXME don't swallow the error */

        catch_class = mono_class_from_mono_type_internal (inflated_type);
        mono_metadata_free_type (inflated_type);

        return catch_class;
}

/*
 * mini_jit_info_table_find_ext:
 *
 *   Same as mono_jit_info_table_find, but search all the domains of the current thread
 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
 * OUT_DOMAIN if it is not NULL.
 */
MonoJitInfo*
mini_jit_info_table_find_ext (MonoDomain *domain, gpointer addr, gboolean allow_trampolines, MonoDomain **out_domain)
{
        MonoJitInfo *ji;
        MonoInternalThread *t = mono_thread_internal_current ();
        gpointer *refs;

        if (out_domain)
                *out_domain = NULL;

        ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
        if (ji) {
                if (out_domain)
                        *out_domain = domain;
                return ji;
        }

        /* maybe it is shared code, so we also search in the root domain */
        if (domain != mono_get_root_domain ()) {
                ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
                if (ji) {
                        if (out_domain)
                                *out_domain = mono_get_root_domain ();
                        return ji;
                }
        }

        if (!t)
                return NULL;

        refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
        for (; refs && *refs; refs++) {
                if (*refs != domain && *refs != mono_get_root_domain ()) {
                        ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
                        if (ji) {
                                if (out_domain)
                                        *out_domain = (MonoDomain*) *refs;
                                return ji;
                        }
                }
        }

        return NULL;
}

MonoJitInfo*
mini_jit_info_table_find (MonoDomain *domain, gpointer addr, MonoDomain **out_domain)
{
        return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
}

/* Class lazy loading functions */
static GENERATE_GET_CLASS_WITH_CACHE (runtime_compat_attr, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute")

/*
 * wrap_non_exception_throws:
 *
 *   Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
 * WrapNonExceptionThrows flag set.
 */
static gboolean
wrap_non_exception_throws (MonoMethod *m)
{
        ERROR_DECL (error);
        MonoAssembly *ass = m_class_get_image (m->klass)->assembly;
        MonoCustomAttrInfo* attrs;
        MonoClass *klass;
        int i;
        gboolean val = FALSE;

        if (m->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD) {
                MonoDynamicMethod *dm = (MonoDynamicMethod *)m;
                if (dm->assembly)
                        ass = dm->assembly;
        }
        g_assert (ass);
        if (ass->wrap_non_exception_throws_inited)
                return ass->wrap_non_exception_throws;

        klass = mono_class_get_runtime_compat_attr_class ();

        attrs = mono_custom_attrs_from_assembly_checked (ass, FALSE, error);
        mono_error_cleanup (error); /* FIXME don't swallow the error */
        if (attrs) {
                for (i = 0; i < attrs->num_attrs; ++i) {
                        MonoCustomAttrEntry *attr = &attrs->attrs [i];
                        const gchar *p;
                        int num_named, named_type, name_len;
                        char *name;

                        if (!attr->ctor || attr->ctor->klass != klass)
                                continue;
                        /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
                        p = (const char*)attr->data;
                        g_assert (read16 (p) == 0x0001);
                        p += 2;
                        num_named = read16 (p);
                        if (num_named != 1)
                                continue;
                        p += 2;
                        named_type = *p;
                        p ++;
                        /* data_type = *p; */
                        p ++;
                        /* Property */
                        if (named_type != 0x54)
                                continue;
                        name_len = mono_metadata_decode_blob_size (p, &p);
                        name = (char *)g_malloc (name_len + 1);
                        memcpy (name, p, name_len);
                        name [name_len] = 0;
                        p += name_len;
                        g_assert (!strcmp (name, "WrapNonExceptionThrows"));
                        g_free (name);
                        /* The value is a BOOLEAN */
                        val = *p;
                }
                mono_custom_attrs_free (attrs);
        }

        ass->wrap_non_exception_throws = val;
        mono_memory_barrier ();
        ass->wrap_non_exception_throws_inited = TRUE;

        return val;
}

#define MAX_UNMANAGED_BACKTRACE 128
static MonoArray*
build_native_trace (MonoError *error)
{
        error_init (error);
/* This puppy only makes sense on mobile, IOW, ARM. */
#if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
        MonoArray *res;
        void *native_trace [MAX_UNMANAGED_BACKTRACE];
        int size = -1;
        MONO_ENTER_GC_SAFE;
        size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
        MONO_EXIT_GC_SAFE;
        int i;

        if (!size)
                return NULL;
        res = mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, size, error);
        return_val_if_nok (error, NULL);

        for (i = 0; i < size; i++)
                mono_array_set_internal (res, gpointer, i, native_trace [i]);
        return res;
#else
        return NULL;
#endif
}

static void
remove_wrappers_from_trace (GList **trace_ips_p)
{
        GList *trace_ips = *trace_ips_p;
        GList *p = trace_ips;

        /* jit info, generic info, ip */
        while (p) {
                MonoJitInfo *jinfo = (MonoJitInfo*) p->data;
                GList *next_p = p->next->next->next;
                /* FIXME Maybe remove more wrapper types */
                if (jinfo->d.method->wrapper_type == MONO_WRAPPER_OTHER) {
                        trace_ips = g_list_delete_link (trace_ips, p->next->next);
                        trace_ips = g_list_delete_link (trace_ips, p->next);
                        trace_ips = g_list_delete_link (trace_ips, p);
                }
                p = next_p;
        }

        *trace_ips_p = trace_ips;
}

/* This can be called more than once on a MonoException. */
static void
setup_stack_trace (MonoException *mono_ex, GSList **dynamic_methods, GList *trace_ips, gboolean remove_wrappers)
{
        if (mono_ex) {
                GList *trace_ips_copy = g_list_copy (trace_ips);
                if (remove_wrappers)
                        remove_wrappers_from_trace (&trace_ips_copy);
                trace_ips_copy = g_list_reverse (trace_ips_copy);
                ERROR_DECL (error);
                MonoArray *ips_arr = mono_glist_to_array (trace_ips_copy, mono_defaults.int_class, error);
                mono_error_assert_ok (error);
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, trace_ips, ips_arr);
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, native_trace_ips, build_native_trace (error));
                mono_error_assert_ok (error);
                if (*dynamic_methods) {
                        /* These methods could go away anytime, so save a reference to them in the exception object */
                        GSList *l;
                        MonoMList *list = (MonoMList*)mono_ex->dynamic_methods;

                        for (l = *dynamic_methods; l; l = l->next) {
                                guint32 dis_link;
                                MonoDomain *domain = mono_domain_get ();

                                if (domain->method_to_dyn_method) {
                                        mono_domain_lock (domain);
                                        dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
                                        mono_domain_unlock (domain);
                                        if (dis_link) {
                                                MonoObject *o = mono_gchandle_get_target_internal (dis_link);
                                                if (o) {
                                                        list = mono_mlist_prepend_checked (list, o, error);
                                                        mono_error_assert_ok (error);
                                                }
                                        }
                                }
                        }

                        MONO_OBJECT_SETREF_INTERNAL (mono_ex, dynamic_methods, list);

                        g_slist_free (*dynamic_methods);
                        *dynamic_methods = NULL;
                }

                g_list_free (trace_ips_copy);
        }
}

typedef enum {
        MONO_FIRST_PASS_UNHANDLED,
        MONO_FIRST_PASS_CALLBACK_TO_NATIVE,
        MONO_FIRST_PASS_HANDLED,
} MonoFirstPassResult;

/*
 * handle_exception_first_pass:
 *
 *   The first pass of exception handling. Unwind the stack until a catch
 * clause which can catch OBJ is found. Store the index of the filter clause
 * which caught the exception into OUT_FILTER_IDX. Return
 * \c MONO_FIRST_PASS_HANDLED if the exception is caught,
 * \c MONO_FIRST_PASS_UNHANDLED otherwise, unless there is a native-to-managed
 * wrapper and an exception handling callback is installed (in which case
 * return \c MONO_FIRST_PASS_CALLBACK_TO_NATIVE).
 */
static MonoFirstPassResult
handle_exception_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception, StackFrameInfo *catch_frame)
{
        ERROR_DECL (error);
        MonoDomain *domain = mono_domain_get ();
        MonoJitInfo *ji = NULL;
        static int (*call_filter) (MonoContext *, gpointer) = NULL;
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        MonoLMF *lmf = mono_get_lmf ();
        GList *trace_ips = NULL;
        GSList *dynamic_methods = NULL;
        MonoException *mono_ex;
        gboolean stack_overflow = FALSE;
        MonoContext initial_ctx;
        MonoMethod *method;
        int frame_count = 0;
        gint32 filter_idx;
        int i;
        MonoObject *ex_obj;
        Unwinder unwinder;
        gboolean in_interp;

        MonoFirstPassResult result = MONO_FIRST_PASS_UNHANDLED;

        g_assert (ctx != NULL);

        if (obj == (MonoObject *)domain->stack_overflow_ex)
                stack_overflow = TRUE;

        mono_ex = (MonoException*)obj;
        MonoArray *initial_trace_ips = mono_ex->trace_ips;
        if (initial_trace_ips) {
                int len = mono_array_length_internal (initial_trace_ips) / TRACE_IP_ENTRY_SIZE;

                // If we catch in managed/non-wrapper, we don't save the catching frame
                if (!mono_ex->caught_in_unmanaged)
                        len -= 1;

                for (i = 0; i < len; i++) {
                        for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
                                gpointer p = mono_array_get_internal (initial_trace_ips, gpointer, (i * TRACE_IP_ENTRY_SIZE) + j);
                                trace_ips = g_list_prepend (trace_ips, p);
                        }
                }
        }

        // Reset the state because we're making it be caught somewhere
        if (mono_ex->caught_in_unmanaged)
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, caught_in_unmanaged, 0);

        if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
                mono_error_assert_ok (error);
                mono_ex = NULL;
        }

        if (!call_filter)
                call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();

        g_assert (jit_tls->end_of_stack);
        g_assert (jit_tls->abort_func);

        if (out_filter_idx)
                *out_filter_idx = -1;
        if (out_ji)
                *out_ji = NULL;
        if (out_prev_ji)
                *out_prev_ji = NULL;
        filter_idx = 0;
        initial_ctx = *ctx;

        unwinder_init (&unwinder);

        while (1) {
                MonoContext new_ctx;
                guint32 free_stack;
                int clause_index_start = 0;
                gboolean unwind_res = TRUE;
                
                StackFrameInfo frame;

                if (out_prev_ji)
                        *out_prev_ji = ji;

                unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
                if (!unwind_res) {
                        setup_stack_trace (mono_ex, &dynamic_methods, trace_ips, FALSE);
                        g_list_free (trace_ips);
                        return result;
                }

                switch (frame.type) {
                case FRAME_TYPE_DEBUGGER_INVOKE:
                case FRAME_TYPE_MANAGED_TO_NATIVE:
                case FRAME_TYPE_TRAMPOLINE:
                case FRAME_TYPE_INTERP_TO_MANAGED:
                case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
                        *ctx = new_ctx;
                        continue;
                case FRAME_TYPE_INTERP:
                case FRAME_TYPE_MANAGED:
                        break;
                default:
                        g_assert_not_reached ();
                        break;
                }

                in_interp = frame.type == FRAME_TYPE_INTERP;
                ji = frame.ji;

                gpointer ip;
                if (in_interp)
                        ip = (guint8*)ji->code_start + frame.native_offset;
                else
                        ip = MONO_CONTEXT_GET_IP (ctx);

                frame_count ++;
                method = jinfo_get_method (ji);
                //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);

                if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
                        g_error ("A native frame was found while unwinding the stack after an exception.\n"
                                         "The native frame called the managed method:\n%s\n",
                                         mono_method_full_name (method, TRUE));
                }

                if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
                        // avoid giant stack traces during a stack overflow
                        if (frame_count < 1000) {
                                trace_ips = g_list_prepend (trace_ips, ip);
                                trace_ips = g_list_prepend (trace_ips, get_generic_info_from_stack_frame (ji, ctx));
                                trace_ips = g_list_prepend (trace_ips, ji);
                        }
                }

                if (method->dynamic)
                        dynamic_methods = g_slist_prepend (dynamic_methods, method);

                if (stack_overflow) {
                        free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
                } else {
                        free_stack = 0xffffff;
                }

                if (method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED && ftnptr_eh_callback) {
                        result = MONO_FIRST_PASS_CALLBACK_TO_NATIVE;
                }
                                
                                
                for (i = clause_index_start; i < ji->num_clauses; i++) {
                        MonoJitExceptionInfo *ei = &ji->clauses [i];
                        gboolean filtered = FALSE;

                        /* 
                         * During stack overflow, wait till the unwinding frees some stack
                         * space before running handlers/finalizers.
                         */
                        if (free_stack <= (64 * 1024))
                                continue;

                        if (is_address_protected (ji, ei, ip)) {
                                /* catch block */
                                MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);

                                /*
                                 * Have to unwrap RuntimeWrappedExceptions if the
                                 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
                                 */
                                if (non_exception && !wrap_non_exception_throws (method))
                                        ex_obj = non_exception;
                                else
                                        ex_obj = obj;

                                if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
                                        setup_stack_trace (mono_ex, &dynamic_methods, trace_ips, FALSE);

#ifndef DISABLE_PERFCOUNTERS
                                        mono_atomic_inc_i32 (&mono_perfcounters->exceptions_filters);
#endif

                                        if (!ji->is_interp) {
#ifndef MONO_CROSS_COMPILE
#ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
                                                if (ji->from_llvm)
                                                        MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
                                                else
                                                        /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
                                                        *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#else
                                                g_assert (!ji->from_llvm);
                                                /* store the exception object in bp + ei->exvar_offset */
                                                *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#endif
#endif

#ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
                                                /*
                                                 * Pass the original il clause index to the landing pad so it can
                                                 * branch to the landing pad associated with the il clause.
                                                 * This is needed because llvm compiled code assumes that the EH
                                                 * code always branches to the innermost landing pad.
                                                 */
                                                if (ji->from_llvm)
                                                        MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
#endif
                                        }

                                        mini_get_dbg_callbacks ()->begin_exception_filter (mono_ex, ctx, &initial_ctx);

                                        if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
                                                jit_tls->orig_ex_ctx_set = TRUE;
                                                MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
                                                jit_tls->orig_ex_ctx_set = FALSE;
                                        }

                                        if (ji->is_interp) {
                                                /* The filter ends where the exception handler starts */
                                                filtered = mini_get_interp_callbacks ()->run_filter (&frame, (MonoException*)ex_obj, i, ei->data.filter, ei->handler_start);
                                        } else {
                                                filtered = call_filter (ctx, ei->data.filter);
                                        }
                                        mini_get_dbg_callbacks ()->end_exception_filter (mono_ex, ctx, &initial_ctx);
                                        if (filtered && out_filter_idx)
                                                *out_filter_idx = filter_idx;
                                        if (out_ji)
                                                *out_ji = ji;
                                        filter_idx ++;

                                        if (filtered) {
                                                g_list_free (trace_ips);
                                                /* mono_debugger_agent_handle_exception () needs this */
                                                mini_set_abort_threshold (&frame);
                                                MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
                                                frame.native_offset = (char*)ei->handler_start - (char*)ji->code_start;
                                                *catch_frame = frame;
                                                result = MONO_FIRST_PASS_HANDLED;
                                                return result;
                                        }
                                }

                                ERROR_DECL (isinst_error); // FIXME not used https://github.com/mono/mono/pull/3055/files#r240548187
                                if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (ex_obj, catch_class, error)) {
                                        /* runtime invokes catch even unhandled exceptions */
                                        setup_stack_trace (mono_ex, &dynamic_methods, trace_ips, method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE);
                                        g_list_free (trace_ips);

                                        if (out_ji)
                                                *out_ji = ji;

                                        /* mono_debugger_agent_handle_exception () needs this */
                                        if (!in_interp)
                                                MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
                                        frame.native_offset = (char*)ei->handler_start - (char*)ji->code_start;
                                        *catch_frame = frame;
                                        result = MONO_FIRST_PASS_HANDLED;
                                        return result;
                                }
                                mono_error_cleanup (isinst_error);
                        }
                }

                *ctx = new_ctx;
        }

        g_assert_not_reached ();
}

/*
 * We implement delaying of aborts when in finally blocks by reusing the
 * abort protected block mechanism. The problem is that when throwing an
 * exception in a finally block we don't get to exit the protected block.
 * We exit it here when unwinding. Given that the order of the clauses
 * in the jit info is from inner clauses to the outer clauses, when we
 * want to exit the finally blocks inner to the clause that handles the
 * exception, we need to search up to its index.
 *
 * FIXME We should do this inside interp, but with mixed mode we can
 * resume directly, without giving control back to the interp.
 */
static void
interp_exit_finally_abort_blocks (MonoJitInfo *ji, int start_clause, int end_clause, gpointer ip)
{
        int i;
        for (i = start_clause; i < end_clause; i++) {
                MonoJitExceptionInfo *ei = &ji->clauses [i];
                if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY &&
                                ip >= ei->handler_start &&
                                ip < ei->data.handler_end) {
                        mono_threads_end_abort_protected_block ();
                }
        }
}

static MonoException *
mono_get_exception_runtime_wrapped_checked (MonoObject *wrapped_exception_raw, MonoError *error)
{
        HANDLE_FUNCTION_ENTER ();
        MONO_HANDLE_DCL (MonoObject, wrapped_exception);
        MonoExceptionHandle ret = mono_get_exception_runtime_wrapped_handle (wrapped_exception, error);
        HANDLE_FUNCTION_RETURN_OBJ (ret);
}

/**
 * mono_handle_exception_internal:
 * \param ctx saved processor state
 * \param obj the exception object
 * \param resume whenever to resume unwinding based on the state in \c MonoJitTlsData.
 */
static gboolean
mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
{
        ERROR_DECL (error);
        MonoDomain *domain = mono_domain_get ();
        MonoJitInfo *ji, *prev_ji;
        static int (*call_filter) (MonoContext *, gpointer) = NULL;
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        MonoLMF *lmf = mono_get_lmf ();
        MonoException *mono_ex;
        gboolean stack_overflow = FALSE;
        MonoContext initial_ctx;
        MonoMethod *method;
        int frame_count = 0;
        gint32 filter_idx, first_filter_idx = 0;
        int i;
        MonoObject *ex_obj = NULL;
        MonoObject *non_exception = NULL;
        Unwinder unwinder;
        gboolean in_interp;

        g_assert (ctx != NULL);
        if (!obj) {
                MonoException *ex = mono_get_exception_null_reference ();
                MonoString *msg = mono_string_new_checked (domain, "Object reference not set to an instance of an object", error);
                mono_error_assert_ok (error);
                MONO_OBJECT_SETREF_INTERNAL (ex, message, msg);
                obj = (MonoObject *)ex;
        } 

        /*
         * Allocate a new exception object instead of the preconstructed ones.
         */
        if (obj == (MonoObject *)domain->stack_overflow_ex) {
                /*
                 * It is not a good idea to try and put even more pressure on the little stack available.
                 * obj = mono_get_exception_stack_overflow ();
                 */
                stack_overflow = TRUE;
        }
        else if (obj == (MonoObject *)domain->null_reference_ex) {
                obj = (MonoObject *)mono_get_exception_null_reference ();
        }

        if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
                mono_error_assert_ok (error);
                non_exception = obj;
                obj = (MonoObject *)mono_get_exception_runtime_wrapped_checked (obj, error);
                mono_error_assert_ok (error);
        }

        mono_ex = (MonoException*)obj;

        if (mini_get_debug_options ()->suspend_on_exception) {
                mono_runtime_printf_err ("Exception thrown, suspending...");
                while (1)
                        ;
        }

        if (mono_object_isinst_checked (obj, mono_defaults.exception_class, error)) {
                mono_ex = (MonoException*)obj;
        } else {
                mono_error_assert_ok (error);
                mono_ex = NULL;
        }

        if (mono_ex && jit_tls->class_cast_from) {
                if (!strcmp (m_class_get_name (mono_ex->object.vtable->klass), "InvalidCastException")) {
                        char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
                        char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
                        char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
                        mono_ex->message = mono_string_new_checked (domain, msg, error);
                        g_free (from_name);
                        g_free (to_name);
                        if (!is_ok (error)) {
                                mono_runtime_printf_err ("Error creating class cast exception message '%s'\n", msg);
                                mono_error_assert_ok (error);
                        }
                        g_free (msg);
                }
                if (!strcmp (m_class_get_name (mono_ex->object.vtable->klass), "ArrayTypeMismatchException")) {
                        char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
                        char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
                        char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
                        mono_ex->message = mono_string_new_checked (domain, msg, error);
                        g_free (from_name);
                        g_free (to_name);
                        if (!is_ok (error)) {
                                mono_runtime_printf_err ("Error creating array type mismatch exception message '%s'\n", msg);
                                mono_error_assert_ok (error);
                        }
                        g_free (msg);
                }
        }

        if (!call_filter)
                call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();

        g_assert (jit_tls->end_of_stack);
        g_assert (jit_tls->abort_func);

        /*
         * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
         * end up being TRUE on any code path.
         */
        memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));

        if (!resume) {
                MonoContext ctx_cp = *ctx;
                if (mono_trace_is_enabled ()) {
                        ERROR_DECL (error);
                        MonoMethod *system_exception_get_message = mono_class_get_method_from_name_checked (mono_defaults.exception_class, "get_Message", 0, 0, error);
                        mono_error_cleanup (error);
                        error_init (error);
                        MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method_internal (obj, system_exception_get_message);
                        MonoObject *message;
                        const char *type_name = m_class_get_name (mono_object_class (mono_ex));
                        char *msg = NULL;
                        if (get_message == NULL) {
                                message = NULL;
                        } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
                                message = NULL;
                                msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
                        } else {
                                MonoObject *exc = NULL;
                                message = mono_runtime_try_invoke (get_message, obj, NULL, &exc, error);
                                g_assert (exc == NULL);
                                mono_error_assert_ok (error);
                        }
                        if (msg == NULL) {
                                if (message) {
                                        msg = mono_string_to_utf8_checked_internal ((MonoString *) message, error);
                                        if (!is_ok (error)) {
                                                mono_error_cleanup (error);
                                                msg = g_strdup ("(error while display System.Exception.Message property)");
                                        }
                                } else {
                                        msg = g_strdup ("(System.Exception.Message property not available)");
                                }
                        }
                        g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)mono_native_thread_id_get (), m_class_get_name_space (mono_object_class (obj)), m_class_get_name (mono_object_class (obj)), msg);
                        g_free (msg);
                        if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
                                mono_print_thread_dump_from_ctx (ctx);
                }
                jit_tls->orig_ex_ctx_set = TRUE;
                MONO_PROFILER_RAISE (exception_throw, (obj));
                jit_tls->orig_ex_ctx_set = FALSE;

                StackFrameInfo catch_frame;
                MonoFirstPassResult res;
                res = handle_exception_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception, &catch_frame);

                if (res == MONO_FIRST_PASS_UNHANDLED) {
                        if (mono_aot_mode == MONO_AOT_MODE_LLVMONLY_INTERP) {
                                /* Reached the top interpreted frames, but there might be native frames above us */
                                throw_exception (obj, TRUE);
                                g_assert_not_reached ();
                        }
                        if (mini_get_debug_options ()->break_on_exc)
                                G_BREAKPOINT ();
                        mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, NULL, NULL);

                        if (mini_get_debug_options ()->suspend_on_unhandled) {
                                mono_runtime_printf_err ("Unhandled exception, suspending...");
                                while (1)
                                        ;
                        }

                        // FIXME: This runs managed code so it might cause another stack overflow when
                        // we are handling a stack overflow
                        mini_set_abort_threshold (&catch_frame);
                        mono_unhandled_exception_internal (obj);
                } else {
                        gboolean unhandled = FALSE;

                        /*
                         * The exceptions caught by the mono_runtime_invoke_checked () calls
                         * in the threadpool needs to be treated as unhandled (#669836).
                         *
                         * FIXME: The check below is hackish, but its hard to distinguish
                         * these runtime invoke calls from others in the runtime.
                         */
                        if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
                                if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
                                        unhandled = TRUE;
                        }

                        if (unhandled)
                                mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, NULL, NULL);
                        else if (jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
                                mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, NULL, NULL);
                                mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, &ctx_cp, &catch_frame);
                        }
                        else if (res != MONO_FIRST_PASS_CALLBACK_TO_NATIVE)
                                mini_get_dbg_callbacks ()->handle_exception ((MonoException *)obj, ctx, &ctx_cp, &catch_frame);
                }
        }

        if (out_ji)
                *out_ji = NULL;
        filter_idx = 0;
        initial_ctx = *ctx;

        unwinder_init (&unwinder);

        while (1) {
                MonoContext new_ctx;
                guint32 free_stack;
                int clause_index_start = 0;
                gboolean unwind_res = TRUE;
                StackFrameInfo frame;
                gpointer ip;
                
                if (resume) {
                        resume = FALSE;
                        ji = jit_tls->resume_state.ji;
                        new_ctx = jit_tls->resume_state.new_ctx;
                        clause_index_start = jit_tls->resume_state.clause_index;
                        lmf = jit_tls->resume_state.lmf;
                        first_filter_idx = jit_tls->resume_state.first_filter_idx;
                        filter_idx = jit_tls->resume_state.filter_idx;
                        in_interp = FALSE;
                } else {
                        unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
                        if (!unwind_res) {
                                *(mono_get_lmf_addr ()) = lmf;

                                jit_tls->abort_func (obj);
                                g_assert_not_reached ();
                        }
                        switch (frame.type) {
                        case FRAME_TYPE_DEBUGGER_INVOKE:
                        case FRAME_TYPE_MANAGED_TO_NATIVE:
                        case FRAME_TYPE_TRAMPOLINE:
                        case FRAME_TYPE_INTERP_TO_MANAGED_WITH_CTX:
                                *ctx = new_ctx;
                                continue;
                        case FRAME_TYPE_INTERP_TO_MANAGED:
                                continue;
                        case FRAME_TYPE_INTERP:
                        case FRAME_TYPE_MANAGED:
                                break;
                        default:
                                g_assert_not_reached ();
                                break;
                        }
                        in_interp = frame.type == FRAME_TYPE_INTERP;
                        ji = frame.ji;
                }

                if (in_interp)
                        ip = (guint8*)ji->code_start + frame.native_offset;
                else
                        ip = MONO_CONTEXT_GET_IP (ctx);

                method = jinfo_get_method (ji);
                frame_count ++;
                //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);

                if (stack_overflow) {
                        free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
                } else {
                        free_stack = 0xffffff;
                }

                if (method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED && ftnptr_eh_callback) {
                        guint32 handle = mono_gchandle_new_internal (obj, FALSE);
                        MONO_STACKDATA (stackptr);

                        mono_threads_enter_gc_safe_region_unbalanced_internal (&stackptr);
                        mono_set_lmf (lmf);
                        ftnptr_eh_callback (handle);
                        g_error ("Did not expect ftnptr_eh_callback to return.");
                }

                for (i = clause_index_start; i < ji->num_clauses; i++) {
                        MonoJitExceptionInfo *ei = &ji->clauses [i];
                        gboolean filtered = FALSE;

                        /* 
                         * During stack overflow, wait till the unwinding frees some stack
                         * space before running handlers/finalizers.
                         */
                        if (free_stack <= (64 * 1024))
                                continue;

                        if (is_address_protected (ji, ei, ip)) {
                                /* catch block */
                                MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);

                                /*
                                 * Have to unwrap RuntimeWrappedExceptions if the
                                 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
                                 */
                                if (non_exception && !wrap_non_exception_throws (method))
                                        ex_obj = non_exception;
                                else
                                        ex_obj = obj;

                                if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
#ifndef MONO_CROSS_COMPILE
#ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
                                        MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
#else
                                        g_assert (!ji->from_llvm);
                                        /* store the exception object in bp + ei->exvar_offset */
                                        *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
#endif
#endif
                                }

#ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
                                if (ji->from_llvm)
                                        MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
#endif

                                if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
                                        /* 
                                         * Filter clauses should only be run in the 
                                         * first pass of exception handling.
                                         */
                                        filtered = (filter_idx == first_filter_idx);
                                        filter_idx ++;
                                }

                                error_init (error);
                                if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE && 
                                     mono_object_isinst_checked (ex_obj, catch_class, error)) || filtered) {
                                        /*
                                         * This guards against the situation that we abort a thread that is executing a finally clause
                                         * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
                                         * check for this situation here and resume interruption if we are below the guarded block.
                                         */
                                        if (G_UNLIKELY (jit_tls->handler_block)) {
                                                gboolean is_outside = FALSE;
                                                gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
                                                gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
                                                //FIXME make this stack direction aware

                                                if (catch_bp > prot_bp) {
                                                        is_outside = TRUE;
                                                } else if (catch_bp == prot_bp) {
                                                        /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
                                                         * So we check if the catch handler_start is protected by the guarded handler protected region
                                                         *
                                                         * Assumptions:
                                                         *      If there is an outstanding guarded_block return address, it means the current thread must be aborted.
                                                         *      This is the only way to reach out the guarded block as other cases are handled by the trampoline.
                                                         *      There aren't any further finally/fault handler blocks down the stack over this exception.
                                                         *   This must be ensured by the code that installs the guard trampoline.
                                                         */
                                                        g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));

                                                        if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
                                                                is_outside = TRUE;
                                                        }
                                                }
                                                if (is_outside) {
                                                        jit_tls->handler_block = NULL;
                                                        mono_thread_resume_interruption (TRUE); /*We ignore the exception here, it will be raised later*/
                                                }
                                        }

                                        if (mono_trace_is_enabled () && mono_trace_eval (method))
                                                g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));

                                        /*
                                         * At this point, ei->flags can be either MONO_EXCEPTION_CLAUSE_NONE for a
                                         * a try-catch clause or MONO_EXCEPTION_CLAUSE_FILTER for a try-filter-catch
                                         * clause. Since we specifically want to indicate that we're executing the
                                         * catch portion of this EH clause, pass MONO_EXCEPTION_CLAUSE_NONE explicitly
                                         * instead of ei->flags.
                                         */
                                        if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
                                                jit_tls->orig_ex_ctx_set = TRUE;
                                                MONO_PROFILER_RAISE (exception_clause, (method, i, MONO_EXCEPTION_CLAUSE_NONE, ex_obj));
                                                jit_tls->orig_ex_ctx_set = FALSE;
                                        }

                                        mini_set_abort_threshold (&frame);

                                        if (in_interp) {
                                                interp_exit_finally_abort_blocks (ji, clause_index_start, i, ip);
                                                /*
                                                 * ctx->pc points into the interpreter, after the call which transitioned to
                                                 * JITted code. Store the unwind state into the
                                                 * interpeter state, then resume, the interpreter will unwind itself until
                                                 * it reaches the target frame and will continue execution from there.
                                                 * The resuming is kinda hackish, from the native code standpoint, it looks
                                                 * like the call which transitioned to JITted code has succeeded, but the
                                                 * return value register etc. is not set, so we have to be careful.
                                                 */
                                                mini_get_interp_callbacks ()->set_resume_state (jit_tls, mono_ex, ei, frame.interp_frame, ei->handler_start);
                                                /* Undo the IP adjustment done by mono_arch_unwind_frame () */
                                                /* ip == 0 means an interpreter frame */
                                                if (MONO_CONTEXT_GET_IP (ctx) != 0)
                                                        mono_arch_undo_ip_adjustment (ctx);
                                        } else {
                                                MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
                                        }
                                        mono_set_lmf (lmf);
#ifndef DISABLE_PERFCOUNTERS
                                        mono_atomic_fetch_add_i32 (&mono_perfcounters->exceptions_depth, frame_count);
#endif
                                        if (obj == (MonoObject *)domain->stack_overflow_ex)
                                                jit_tls->handling_stack_ovf = FALSE;

                                        return 0;
                                }
                                mono_error_cleanup (error);
                                if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
                                        if (mono_trace_is_enabled () && mono_trace_eval (method))
                                                g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));

                                        if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
                                                jit_tls->orig_ex_ctx_set = TRUE;
                                                MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
                                                jit_tls->orig_ex_ctx_set = FALSE;
                                        }
                                }
                                if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
                                        if (mono_trace_is_enabled () && mono_trace_eval (method))
                                                g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));

                                        if (G_UNLIKELY (mono_profiler_clauses_enabled ())) {
                                                jit_tls->orig_ex_ctx_set = TRUE;
                                                MONO_PROFILER_RAISE (exception_clause, (method, i, (MonoExceptionEnum)ei->flags, ex_obj));
                                                jit_tls->orig_ex_ctx_set = FALSE;
                                        }

#ifndef DISABLE_PERFCOUNTERS
                                        mono_atomic_inc_i32 (&mono_perfcounters->exceptions_finallys);
#endif
                                }
                                if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT || ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
                                        mono_set_lmf (lmf);
                                        if (ji->from_llvm) {
                                                /* 
                                                 * LLVM compiled finally handlers follow the design
                                                 * of the c++ ehabi, i.e. they call a resume function
                                                 * at the end instead of returning to the caller.
                                                 * So save the exception handling state,
                                                 * mono_resume_unwind () will call us again to continue
                                                 * the unwinding.
                                                 */
                                                jit_tls->resume_state.ex_obj = obj;
                                                jit_tls->resume_state.ji = ji;
                                                jit_tls->resume_state.clause_index = i + 1;
                                                jit_tls->resume_state.ctx = *ctx;
                                                jit_tls->resume_state.new_ctx = new_ctx;
                                                jit_tls->resume_state.lmf = lmf;
                                                jit_tls->resume_state.first_filter_idx = first_filter_idx;
                                                jit_tls->resume_state.filter_idx = filter_idx;
                                                mini_set_abort_threshold (&frame);
                                                MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
                                                return 0;
                                        } else {
                                                mini_set_abort_threshold (&frame);
                                                if (in_interp) {
                                                        gboolean has_ex = mini_get_interp_callbacks ()->run_finally (&frame, i, ei->handler_start, ei->data.handler_end);
                                                        if (has_ex) {
                                                                /*
                                                                 * If run_finally didn't resume to a context, it means that the handler frame
                                                                 * is linked to the frame calling finally through interpreter frames. This
                                                                 * means that we will reach the handler frame by resuming the current context.
                                                                 */
                                                                if (MONO_CONTEXT_GET_IP (ctx) != 0)
                                                                        mono_arch_undo_ip_adjustment (ctx);
                                                                return 0;
                                                        }
                                                } else {
                                                        call_filter (ctx, ei->handler_start);
                                                }
                                        }
                                }
                        }
                }

                if (in_interp)
                        interp_exit_finally_abort_blocks (ji, clause_index_start, ji->num_clauses, ip);

                if (MONO_PROFILER_ENABLED (method_exception_leave) &&
                    mono_profiler_get_call_instrumentation_flags (method) & MONO_PROFILER_CALL_INSTRUMENTATION_EXCEPTION_LEAVE) {
                        jit_tls->orig_ex_ctx_set = TRUE;
                        MONO_PROFILER_RAISE (method_exception_leave, (method, ex_obj));
                        jit_tls->orig_ex_ctx_set = FALSE;
                }

                *ctx = new_ctx;
        }

        g_assert_not_reached ();
}

/**
 * mono_debugger_run_finally:
 * \param start_ctx saved processor state
 * This method is called by the Mono Debugger to call all \c finally clauses of the
 * current stack frame.  It's used when the user issues a \c return command to make
 * the current stack frame return.  After returning from this method, the debugger
 * unwinds the stack one frame and gives control back to the user.
 * NOTE: This method is only used when running inside the Mono Debugger.
 */
void
mono_debugger_run_finally (MonoContext *start_ctx)
{
        static int (*call_filter) (MonoContext *, gpointer) = NULL;
        MonoDomain *domain = mono_domain_get ();
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        MonoLMF *lmf = mono_get_lmf ();
        MonoContext ctx, new_ctx;
        MonoJitInfo *ji, rji;
        int i;

        ctx = *start_ctx;

        ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
        if (!ji || ji == (gpointer)-1)
                return;

        if (!call_filter)
                call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();

        for (i = 0; i < ji->num_clauses; i++) {
                MonoJitExceptionInfo *ei = &ji->clauses [i];

                if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
                    (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
                        call_filter (&ctx, ei->handler_start);
                }
        }
}

/**
 * mono_handle_exception:
 * \param ctx saved processor state
 * \param obj the exception object
 *
 *   Handle the exception OBJ starting from the state CTX. Modify CTX to point to the handler clause if the exception is caught, and
 * return TRUE.
 */
gboolean
mono_handle_exception (MonoContext *ctx, gpointer void_obj)
{
        MonoObject *obj = (MonoObject*)void_obj;

        MONO_REQ_GC_UNSAFE_MODE;

#ifndef DISABLE_PERFCOUNTERS
        mono_atomic_inc_i32 (&mono_perfcounters->exceptions_thrown);
#endif

        return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
}

#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK

#ifndef MONO_ARCH_USE_SIGACTION
#error "Can't use sigaltstack without sigaction"
#endif

void
mono_setup_altstack (MonoJitTlsData *tls)
{
        size_t stsize = 0;
        stack_t sa;
        guint8 *staddr = NULL;
#ifdef TARGET_OSX
        /*
         * On macOS Mojave we are encountering a bug when changing mapping for main thread
         * stack pages. Stack overflow on main thread will kill the app.
         */
        gboolean disable_stack_guard = mono_threads_platform_is_main_thread ();
#else
        gboolean disable_stack_guard = FALSE;
#endif

        if (mono_running_on_valgrind ())
                return;

        mono_thread_info_get_stack_bounds (&staddr, &stsize);

        g_assert (staddr);

        tls->end_of_stack = staddr + stsize;
        tls->stack_size = stsize;

        /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/

        if (!disable_stack_guard) {
                tls->stack_ovf_guard_base = staddr + mono_pagesize ();
                tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());

                g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);

                if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
                        /* mprotect can fail for the main thread stack */
                        gpointer gaddr = mono_valloc (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON|MONO_MMAP_FIXED, MONO_MEM_ACCOUNT_EXCEPTIONS);
                        if (gaddr) {
                                g_assert (gaddr == tls->stack_ovf_guard_base);
                                tls->stack_ovf_valloced = TRUE;
                        } else {
                                g_warning ("couldn't allocate guard page, continue without it");
                                tls->stack_ovf_guard_base = NULL;
                                tls->stack_ovf_guard_size = 0;
                        }
                }
        }

        /* Setup an alternate signal stack */
        tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON, MONO_MEM_ACCOUNT_EXCEPTIONS);
        tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;

        g_assert (tls->signal_stack);

        sa.ss_sp = tls->signal_stack;
        sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
        sa.ss_flags = 0;
        g_assert (sigaltstack (&sa, NULL) == 0);

        if (tls->stack_ovf_guard_base)
                mono_gc_register_altstack ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size, (char*)staddr + stsize - ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size), tls->signal_stack, tls->signal_stack_size);
        else
                mono_gc_register_altstack (staddr, stsize, tls->signal_stack, tls->signal_stack_size);

}

void
mono_free_altstack (MonoJitTlsData *tls)
{
        stack_t sa;
        int err;

        sa.ss_sp = tls->signal_stack;
        sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
        sa.ss_flags = SS_DISABLE;
        err = sigaltstack  (&sa, NULL);
        g_assert (err == 0);

        if (tls->signal_stack)
                mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MEM_ACCOUNT_EXCEPTIONS);

        if (!tls->stack_ovf_guard_base)
                return;
        if (tls->stack_ovf_valloced)
                mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MEM_ACCOUNT_EXCEPTIONS);
        else
                mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
}

#else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */

void
mono_setup_altstack (MonoJitTlsData *tls)
{
}

void
mono_free_altstack (MonoJitTlsData *tls)
{
}

#endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */

gboolean
mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
{
        if (!jit_tls)
                return FALSE;

        if (mono_llvm_only)
                return FALSE;

        /* we got a stack overflow in the soft-guard pages
         * There are two cases:
         * 1) managed code caused the overflow: we unprotect the soft-guard page
         * and let the arch-specific code trigger the exception handling mechanism
         * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
         * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
         * and hope we can continue with those enabled, at least until the hard-guard page
         * is hit. The alternative to continuing here is to just print a message and abort.
         * We may add in the future the code to protect the pages again in the codepath
         * when we return from unmanaged to managed code.
         */
        if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
                        fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
                gboolean handled = FALSE;

                mono_mprotect (jit_tls->stack_ovf_guard_base, jit_tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
#ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
                if (ji) {
                        mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
                        handled = TRUE;
                }
#endif
                if (!handled) {
                        /* We print a message: after this even managed stack overflows
                         * may crash the runtime
                         */
                        mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
                        if (!jit_tls->handling_stack_ovf) {
                                jit_tls->handling_stack_ovf = 1;
                        } else {
                                /*fprintf (stderr, "Already handling stack overflow\n");*/
                        }
                }
                return TRUE;
        }
        return FALSE;
}

typedef struct {
        MonoMethod *omethod;
        int count;
} PrintOverflowUserData;

static gboolean
print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
        MonoMethod *method = NULL;
        PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
        gchar *location;

        if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
                method = jinfo_get_method (frame->ji);

        if (method) {
                if (user_data->count == 0) {
                        /* The first frame is in its prolog, so a line number cannot be computed */
                        user_data->count ++;
                        return FALSE;
                }

                /* If this is a one method overflow, skip the other instances */
                if (method == user_data->omethod)
                        return FALSE;

                location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
                mono_runtime_printf_err ("  %s", location);
                g_free (location);

                if (user_data->count == 1) {
                        mono_runtime_printf_err ("  <...>");
                        user_data->omethod = method;
                } else {
                        user_data->omethod = NULL;
                }

                user_data->count ++;
        } else
                mono_runtime_printf_err ("  at <unknown> <0x%05x>", frame->native_offset);

        return FALSE;
}

void
mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, MonoContext *mctx, guint8* fault_addr)
{
        PrintOverflowUserData ud;

        /* we don't do much now, but we can warn the user with a useful message */
        mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", MONO_CONTEXT_GET_IP (mctx), fault_addr);

        mono_runtime_printf_err ("Stacktrace:");

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

        mono_walk_stack_with_ctx (print_overflow_stack_frame, mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);

        _exit (1);
}

static gboolean
print_stack_frame_signal_safe (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
        MonoMethod *method = NULL;

        if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
                method = jinfo_get_method (frame->ji);

        if (method) {
                const char *name_space = m_class_get_name_space (method->klass);
                g_async_safe_printf("\t  at %s%s%s:%s <0x%05x>\n", name_space, (name_space [0] != '\0' ? "." : ""), m_class_get_name (method->klass), method->name, frame->native_offset);
        } else {
                g_async_safe_printf("\t  at <unknown> <0x%05x>\n", frame->native_offset);
        }

        return FALSE;
}

static G_GNUC_UNUSED gboolean
print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
        GString *p = (GString*)data;
        MonoMethod *method = NULL;

        if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
                method = jinfo_get_method (frame->ji);

        if (method && frame->domain) {
                gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
                g_string_append_printf (p, "  %s\n", location);
                g_free (location);
        } else
                g_string_append_printf (p, "  at <unknown> <0x%05x>\n", frame->native_offset);

        return FALSE;
}

#ifndef MONO_CROSS_COMPILE
static gboolean handle_crash_loop = FALSE;

/*
 * mono_handle_native_crash:
 *
 *   Handle a native crash (e.g. SIGSEGV) while in native code by
 *   printing diagnostic information and aborting.
 */
void
mono_handle_native_crash (const char *signal, MonoContext *mctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();

        if (handle_crash_loop)
                return;

        if (mini_get_debug_options ()->suspend_on_native_crash) {
                g_async_safe_printf ("Received %s, suspending...\n", signal);
                while (1) {
                        // Sleep for 1 second.
                        g_usleep (1000 * 1000);
                }
        }

        /* prevent infinite loops in crash handling */
        handle_crash_loop = TRUE;

        /*
         * A SIGSEGV indicates something went very wrong so we can no longer depend
         * on anything working. So try to print out lots of diagnostics, starting 
         * with ones which have a greater chance of working.
         */

        g_async_safe_printf("\n=================================================================\n");
        g_async_safe_printf("\tNative Crash Reporting\n");
        g_async_safe_printf("=================================================================\n");
        g_async_safe_printf("Got a %s while executing native code. This usually indicates\n", signal);
        g_async_safe_printf("a fatal error in the mono runtime or one of the native libraries \n");
        g_async_safe_printf("used by your application.\n");
        g_async_safe_printf("=================================================================\n");
        mono_dump_native_crash_info (signal, mctx, info);

        /* !jit_tls means the thread was not registered with the runtime */
        // This must be below the native crash dump, because we can't safely
        // do runtime state probing after we have walked the managed stack here.
        if (jit_tls && mono_thread_internal_current () && mctx) {
                g_async_safe_printf ("\n=================================================================\n");
                g_async_safe_printf ("\tManaged Stacktrace:\n");
                g_async_safe_printf ("=================================================================\n");

                mono_walk_stack_full (print_stack_frame_signal_safe, mctx, mono_domain_get (), jit_tls, mono_get_lmf (), MONO_UNWIND_LOOKUP_IL_OFFSET, NULL, TRUE);
                g_async_safe_printf ("=================================================================\n");
        }

#ifdef MONO_ARCH_USE_SIGACTION
        struct sigaction sa;
        sa.sa_handler = SIG_DFL;
        sigemptyset (&sa.sa_mask);
        sa.sa_flags = 0;

        /* Remove our SIGABRT handler */
        g_assert (sigaction (SIGABRT, &sa, NULL) != -1);

        /* On some systems we get a SIGILL when calling abort (), because it might
         * fail to raise SIGABRT */
        g_assert (sigaction (SIGILL, &sa, NULL) != -1);
#endif

        mono_post_native_crash_handler (signal, mctx, info, mono_do_crash_chaining);
}

#else

void
mono_handle_native_crash (const char *signal, MonoContext *mctx, MONO_SIG_HANDLER_INFO_TYPE *info)
{
        g_assert_not_reached ();
}

#endif /* !MONO_CROSS_COMPILE */

static void
mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
{
        MonoInternalThread *thread = mono_thread_internal_current ();
        MonoContext ctx;
        GString* text;
        char *name;
        GError *gerror = NULL;

        if (!thread)
                return;

        text = g_string_new (0);
        if (thread->name) {
                name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &gerror);
                g_assert (!gerror);
                g_string_append_printf (text, "\n\"%s\"", name);
                g_free (name);
        }
        else if (thread->threadpool_thread)
                g_string_append (text, "\n\"<threadpool thread>\"");
        else
                g_string_append (text, "\n\"<unnamed thread>\"");

        g_string_append_printf (text, " tid=%p this=%p ", (gpointer)(gsize)thread->tid, thread);
        mono_thread_internal_describe (thread, text);
        g_string_append (text, "\n");

        if (start_ctx) {
                memcpy (&ctx, start_ctx, sizeof (MonoContext));
        } else if (!sigctx)
                MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
        else
                mono_sigctx_to_monoctx (sigctx, &ctx);

        mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);

        mono_runtime_printf ("%s", text->str);

#if HOST_WIN32 && TARGET_WIN32 && _DEBUG
        OutputDebugStringA(text->str);
#endif

        g_string_free (text, TRUE);
        mono_runtime_stdout_fflush ();
}

/**
 * mono_print_thread_dump:
 *
 * Print information about the current thread to stdout.
 * \p sigctx can be NULL, allowing this to be called from gdb.
 */
void
mono_print_thread_dump (void *sigctx)
{
        mono_print_thread_dump_internal (sigctx, NULL);
}

void
mono_print_thread_dump_from_ctx (MonoContext *ctx)
{
        mono_print_thread_dump_internal (NULL, ctx);
}

/*
 * mono_resume_unwind:
 *
 *   This is called by a trampoline from LLVM compiled finally clauses to continue
 * unwinding.
 */
void
mono_resume_unwind (MonoContext *ctx)
{
        MONO_REQ_GC_UNSAFE_MODE;

        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        MonoContext new_ctx;

        MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
        MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
        new_ctx = *ctx;

        mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);

        mono_restore_context (&new_ctx);
}

typedef struct {
        MonoJitInfo *ji;
        MonoContext ctx;
        MonoJitExceptionInfo *ei;
} FindHandlerBlockData;

static gboolean
find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
{
        int i;
        gpointer ip;
        FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
        MonoJitInfo *ji = frame->ji;

        if (!ji)
                return FALSE;

        ip = MONO_CONTEXT_GET_IP (ctx);

        for (i = 0; i < ji->num_clauses; ++i) {
                MonoJitExceptionInfo *ei = ji->clauses + i;
                if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
                        continue;
                /*If ip points to the first instruction it means the handler block didn't start
                 so we can leave its execution to the EH machinery*/
                if (ei->handler_start <= ip && ip < ei->data.handler_end) {
                        pdata->ji = ji;
                        pdata->ei = ei;
                        pdata->ctx = *ctx;
                        break;
                }
        }
        return FALSE;
}


static void
install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
{
        int i;
        MonoJitExceptionInfo *clause = NULL;
        gpointer ip;
        guint8 *bp;

        ip = MONO_CONTEXT_GET_IP (ctx);

        for (i = 0; i < ji->num_clauses; ++i) {
                clause = &ji->clauses [i];
                if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
                        continue;
                if (clause->handler_start <= ip && clause->data.handler_end > ip)
                        break;
        }

        /*no matching finally - can't happen, we parallel the logic in find_last_handler_block. */
        g_assert (i < ji->num_clauses);

        /*Load the spvar*/
        bp = (guint8*)MONO_CONTEXT_GET_BP (ctx);
        *(bp + clause->exvar_offset) = 1;
}

/*
 * Finds the bottom handler block running and install a block guard if needed.
 */
static gboolean
mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
{
        FindHandlerBlockData data = { 0 };
        MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];

        /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
         * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
         */
        if (!jit_tls || jit_tls->handler_block)
                return FALSE;

        /* Do an async safe stack walk */
        mono_thread_info_set_is_async_context (TRUE);
        mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
        mono_thread_info_set_is_async_context (FALSE);

        if (!data.ji)
                return FALSE;

        memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));

        install_handler_block_guard (data.ji, &data.ctx);

        jit_tls->handler_block = data.ei;

        return TRUE;
}

static void
mono_uninstall_current_handler_block_guard (void)
{
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        if (jit_tls)
                jit_tls->handler_block = NULL;
}


static gboolean
mono_current_thread_has_handle_block_guard (void)
{
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        return jit_tls && jit_tls->handler_block != NULL;
}

void
mono_set_cast_details (MonoClass *from, MonoClass *to)
{
        MonoJitTlsData *jit_tls = NULL;

        if (mini_get_debug_options ()->better_cast_details) {
                jit_tls = mono_tls_get_jit_tls ();
                jit_tls->class_cast_from = from;
                jit_tls->class_cast_to = to;
        }
}


/*returns false if the thread is not attached*/
gboolean
mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
{
        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
        if (!thread) {
                ctx->valid = FALSE;
                return FALSE;
        }

        if (sigctx) {
                mono_sigctx_to_monoctx (sigctx, &ctx->ctx);

                ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
                ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
                ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
        }
        else {
                mono_thread_state_init (ctx);
        }

        if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
                return FALSE;

        ctx->valid = TRUE;
        return TRUE;
}

void
mono_thread_state_init (MonoThreadUnwindState *ctx)
{
        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();

#if defined(MONO_CROSS_COMPILE)
        ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
#elif MONO_ARCH_HAS_MONO_CONTEXT
        MONO_CONTEXT_GET_CURRENT (ctx->ctx);
#else
        g_error ("Use a null sigctx requires a working mono-context");
#endif

        ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
        ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
        ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
        ctx->valid = TRUE;
}


gboolean
mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
{
        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
        if (!thread) {
                ctx->valid = FALSE;
                return FALSE;
        }

        ctx->ctx = *mctx;
        ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
        ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
        ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
        ctx->valid = TRUE;
        return TRUE;
}

/*returns false if the thread is not attached*/
gboolean
mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
{
        MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
        MONO_ARCH_CONTEXT_DEF

        mono_arch_flush_register_windows ();

        if (!thread || !thread->jit_data) {
                ctx->valid = FALSE;
                return FALSE;
        }
        MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);

        ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
        ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
        ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
        ctx->valid = TRUE;
        return TRUE;
}

static void
mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
{
        mono_handle_exception (ctx, (MonoObject *)exc);
        mono_restore_context (ctx);
}

/*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
void
mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
{
#ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
        MonoJitTlsData *jit_tls = mono_tls_get_jit_tls ();
        jit_tls->ex_ctx = *ctx;

        mono_arch_setup_async_callback (ctx, async_cb, user_data);
#else
        g_error ("This target doesn't support mono_arch_setup_async_callback");
#endif
}

/*
 * mono_restore_context:
 *
 *   Call the architecture specific restore context function.
 */
void
mono_restore_context (MonoContext *ctx)
{
        static void (*restore_context) (MonoContext *);

        if (!restore_context)
                restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
        restore_context (ctx);
        g_assert_not_reached ();
}

/*
 * mono_jinfo_get_unwind_info:
 *
 *   Return the unwind info for JI.
 */
guint8*
mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
{
        if (ji->has_unwind_info) {
                /* The address/length in the MonoJitInfo structure itself */
                MonoUnwindJitInfo *info = mono_jit_info_get_unwind_info (ji);
                *unwind_info_len = info->unw_info_len;
                return info->unw_info;
        } else if (ji->from_aot)
                return mono_aot_get_unwind_info (ji, unwind_info_len);
        else
                return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
}

int
mono_jinfo_get_epilog_size (MonoJitInfo *ji)
{
        MonoArchEHJitInfo *info;

        info = mono_jit_info_get_arch_eh_info (ji);
        g_assert (info);

        return info->epilog_size;
}

/*
 * mono_install_ftnptr_eh_callback:
 *
 *   Install a callback that should be called when there is a managed exception
 *   in a native-to-managed wrapper. This is mainly used by iOS to convert a
 *   managed exception to a native exception, to properly unwind the native
 *   stack; this native exception will then be converted back to a managed
 *   exception in their managed-to-native wrapper.
 */
void
mono_install_ftnptr_eh_callback (MonoFtnPtrEHCallback callback)
{
        ftnptr_eh_callback = callback;
}

/*
 * LLVM/Bitcode exception handling.
 */

static void
throw_exception (MonoObject *ex, gboolean rethrow)
{
        MONO_REQ_GC_UNSAFE_MODE;

        ERROR_DECL (error);
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();
        MonoException *mono_ex;

        if (!mono_object_isinst_checked (ex, mono_defaults.exception_class, error)) {
                mono_error_assert_ok (error);
                mono_ex = mono_get_exception_runtime_wrapped_checked (ex, error);
                mono_error_assert_ok (error);
                jit_tls->thrown_non_exc = mono_gchandle_new_internal (ex, FALSE);
        }
        else
                mono_ex = (MonoException*)ex;

        // Note: Not pinned
        jit_tls->thrown_exc = mono_gchandle_new_internal ((MonoObject*)mono_ex, FALSE);

        if (!rethrow) {
#ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
                GList *l, *ips = NULL;
                GList *trace;

                _Unwind_Backtrace (build_stack_trace, &ips);
                /* The list contains ip-gshared info pairs */
                trace = NULL;
                ips = g_list_reverse (ips);
                for (l = ips; l; l = l->next) {
                        trace = g_list_append (trace, l->data);
                        trace = g_list_append (trace, NULL);
                        trace = g_list_append (trace, NULL);
                }
                MonoArray *ips_arr = mono_glist_to_array (trace, mono_defaults.int_class, error);
                mono_error_assert_ok (error);
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, trace_ips, ips_arr);
                g_list_free (l);
                g_list_free (trace);
#endif
        }

        mono_llvm_cpp_throw_exception ();
}

void
mono_llvm_throw_exception (MonoObject *ex)
{
        throw_exception (ex, FALSE);
}

void
mono_llvm_rethrow_exception (MonoObject *ex)
{
        throw_exception (ex, TRUE);
}

void
mono_llvm_raise_exception (MonoException *e)
{
        mono_llvm_throw_exception ((MonoObject*)e);
}

void
mono_llvm_reraise_exception (MonoException *e)
{
        mono_llvm_rethrow_exception ((MonoObject*)e);
}

void
mono_llvm_throw_corlib_exception (guint32 ex_token_index)
{
        guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
        MonoException *ex;

        ex = mono_exception_from_token (m_class_get_image (mono_defaults.exception_class), ex_token);

        mono_llvm_throw_exception ((MonoObject*)ex);
}

/*
 * mono_llvm_resume_exception:
 *
 *   Resume exception propagation.
 */
void
mono_llvm_resume_exception (void)
{
        mono_llvm_cpp_throw_exception ();
}

/*
 * mono_llvm_load_exception:
 *
 *   Return the currently thrown exception.
 */
MonoObject *
mono_llvm_load_exception (void)
{
        ERROR_DECL (error);
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();

        MonoException *mono_ex = (MonoException*)mono_gchandle_get_target_internal (jit_tls->thrown_exc);

        MonoArray *ta = mono_ex->trace_ips;

        if (ta) {
                GList *trace_ips = NULL;
                gpointer ip = MONO_RETURN_ADDRESS ();

                size_t upper = mono_array_length_internal (ta);

                for (int i = 0; i < upper; i += TRACE_IP_ENTRY_SIZE) {
                        gpointer curr_ip = mono_array_get_internal (ta, gpointer, i);
                        for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
                                gpointer p = mono_array_get_internal (ta, gpointer, i + j);
                                trace_ips = g_list_append (trace_ips, p);
                        }
                        if (ip == curr_ip)
                                break;
                }

                // FIXME: Does this work correctly for rethrows?
                // We may be discarding useful information
                // when this gets GC'ed
                MonoArray *ips_arr = mono_glist_to_array (trace_ips, mono_defaults.int_class, error);
                mono_error_assert_ok (error);
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, trace_ips, ips_arr);
                g_list_free (trace_ips);

                // FIXME:
                //MONO_OBJECT_SETREF_INTERNAL (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
        } else {
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, trace_ips, mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, 0, error));
                mono_error_assert_ok (error);
                MONO_OBJECT_SETREF_INTERNAL (mono_ex, stack_trace, mono_array_new_checked (mono_domain_get (), mono_defaults.stack_frame_class, 0, error));
                mono_error_assert_ok (error);
        }

        return &mono_ex->object;
}

/*
 * mono_llvm_clear_exception:
 *
 *   Mark the currently thrown exception as handled.
 */
void
mono_llvm_clear_exception (void)
{
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();
        mono_gchandle_free_internal (jit_tls->thrown_exc);
        jit_tls->thrown_exc = 0;
        if (jit_tls->thrown_non_exc)
                mono_gchandle_free_internal (jit_tls->thrown_non_exc);
        jit_tls->thrown_non_exc = 0;

        mono_memory_barrier ();
}

/*
 * mono_llvm_match_exception:
 *
 *   Return the innermost clause containing REGION_START-REGION_END which can handle
 * the current exception.
 */
gint32
mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
{
        ERROR_DECL (error);
        MonoJitTlsData *jit_tls = mono_get_jit_tls ();
        MonoObject *exc;
        gint32 index = -1;

        g_assert (jit_tls->thrown_exc);
        exc = mono_gchandle_get_target_internal (jit_tls->thrown_exc);
        if (jit_tls->thrown_non_exc) {
                /*
                 * Have to unwrap RuntimeWrappedExceptions if the
                 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
                 */
                if (!wrap_non_exception_throws (jinfo_get_method (jinfo)))
                        exc = mono_gchandle_get_target_internal (jit_tls->thrown_non_exc);
        }

        for (int i = 0; i < jinfo->num_clauses; i++) {
                MonoJitExceptionInfo *ei = &jinfo->clauses [i];
                MonoClass *catch_class;

                if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
                        continue;

                catch_class = ei->data.catch_class;
                if (mono_class_is_open_constructed_type (m_class_get_byval_arg (catch_class))) {
                        MonoGenericContext context;
                        MonoType *inflated_type;

                        g_assert (rgctx || this_obj);
                        context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
                        inflated_type = mono_class_inflate_generic_type_checked (m_class_get_byval_arg (catch_class), &context, error);
                        mono_error_assert_ok (error); /* FIXME don't swallow the error */

                        catch_class = mono_class_from_mono_type_internal (inflated_type);
                        mono_metadata_free_type (inflated_type);
                }

                // FIXME: Handle edge cases handled in get_exception_catch_class
                if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (exc, catch_class, error)) {
                        index = ei->clause_index;
                        break;
                } else
                        mono_error_assert_ok (error);
                
                if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
                        g_assert_not_reached ();
                }
        }

        return index;
}

#if defined(ENABLE_LLVM) && defined(HAVE_UNWIND_H)
G_EXTERN_C _Unwind_Reason_Code mono_debug_personality (int a, _Unwind_Action b,
        uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
{
        g_assert_not_reached ();
}
#else
G_EXTERN_C void mono_debug_personality (void);

void
mono_debug_personality (void)
{
        g_assert_not_reached ();
}
#endif