mono/mini/mini-trampolines.c

   1 /*
   2  * (C) 2003 Ximian, Inc.
   3  * (C) 2003-2011 Novell, Inc.
   4  * Copyright 2011 Xamarin, Inc (http://www.xamarin.com)
   5  */
   6 #include <config.h>
   7 #include <glib.h>
   8
   9 #include <mono/metadata/appdomain.h>
  10 #include <mono/metadata/metadata-internals.h>
  11 #include <mono/metadata/marshal.h>
  12 #include <mono/metadata/tabledefs.h>
  13 #include <mono/utils/mono-counters.h>
  14 #include <mono/utils/mono-error-internals.h>
  15 #include <mono/utils/mono-membar.h>
  16
  17 #include "mini.h"
  18
  19 /*
  20  * Address of the trampoline code.  This is used by the debugger to check
  21  * whether a method is a trampoline.
  22  */
  23 guint8* mono_trampoline_code [MONO_TRAMPOLINE_NUM];
  24
  25 static GHashTable *class_init_hash_addr = NULL;
  26 static GHashTable *rgctx_lazy_fetch_trampoline_hash = NULL;
  27 static GHashTable *rgctx_lazy_fetch_trampoline_hash_addr = NULL;
  28 static guint32 trampoline_calls, jit_trampolines, unbox_trampolines, static_rgctx_trampolines;
  29
  30 #define mono_trampolines_lock() EnterCriticalSection (&trampolines_mutex)
  31 #define mono_trampolines_unlock() LeaveCriticalSection (&trampolines_mutex)
  32 static CRITICAL_SECTION trampolines_mutex;
  33
  34 #ifdef MONO_ARCH_GSHARED_SUPPORTED
  35
  36 typedef struct {
  37         MonoMethod *m;
  38         gpointer addr;
  39 } RgctxTrampInfo;
  40
  41 static gint
  42 rgctx_tramp_info_equal (gconstpointer ka, gconstpointer kb)
  43 {
  44         const RgctxTrampInfo *i1 = ka;
  45         const RgctxTrampInfo *i2 = kb;
  46
  47         if (i1->m == i2->m && i1->addr == i2->addr)
  48                 return 1;
  49         else
  50                 return 0;
  51 }
  52
  53 static guint
  54 rgctx_tramp_info_hash (gconstpointer data)
  55 {
  56         const RgctxTrampInfo *info = data;
  57
  58         return GPOINTER_TO_UINT (info->m) ^ GPOINTER_TO_UINT (info->addr);
  59 }
  60
  61 /**
  62  * mono_create_static_rgctx_trampoline:
  63  * @m: the mono method to create a trampoline for
  64  * @addr: the address to jump to (where the compiled code for M lives)
  65  *
  66  * Creates a static rgctx trampoline for M which branches to ADDR which should
  67  * point to the compiled code of M.
  68  *
  69  * Static rgctx trampolines are used when a shared generic method which doesn't
  70  * have a this argument is called indirectly, ie. from code which can't pass in
  71  * the rgctx argument. The trampoline sets the rgctx argument and jumps to the
  72  * methods code. These trampolines are similar to the unbox trampolines, they
  73  * perform the same task as the static rgctx wrappers, but they are smaller/faster,
  74  * and can be made to work with full AOT.
  75  *
  76  * On PPC addr should be an ftnptr and the return value is an ftnptr too.
  77  *
  78  * Returns the generated static rgctx trampoline.
  79  */
  80 gpointer
  81 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
  82 {
  83         gpointer ctx;
  84         gpointer res;
  85         MonoDomain *domain;
  86         RgctxTrampInfo tmp_info;
  87         RgctxTrampInfo *info;
  88
  89 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
  90         g_assert (((gpointer*)addr) [2] == 0);
  91 #endif
  92
  93         ctx = mini_method_get_rgctx (m);
  94
  95         domain = mono_domain_get ();
  96
  97         /*
  98          * In the AOT case, addr might point to either the method, or to an unbox trampoline,
  99          * so make the hash keyed on the m+addr pair.
 100          */
 101         mono_domain_lock (domain);
 102         if (!domain_jit_info (domain)->static_rgctx_trampoline_hash)
 103                 domain_jit_info (domain)->static_rgctx_trampoline_hash = g_hash_table_new (rgctx_tramp_info_hash, rgctx_tramp_info_equal);
 104         tmp_info.m = m;
 105         tmp_info.addr = addr;
 106         res = g_hash_table_lookup (domain_jit_info (domain)->static_rgctx_trampoline_hash,
 107                                                            &tmp_info);
 108         mono_domain_unlock (domain);
 109         if (res)
 110                 return res;
 111
 112         if (mono_aot_only)
 113                 res = mono_aot_get_static_rgctx_trampoline (ctx, addr);
 114         else
 115                 res = mono_arch_get_static_rgctx_trampoline (m, ctx, addr);
 116
 117         mono_domain_lock (domain);
 118         /* Duplicates inserted while we didn't hold the lock are OK */
 119         info = mono_domain_alloc (domain, sizeof (RgctxTrampInfo));
 120         info->m = m;
 121         info->addr = addr;
 122         g_hash_table_insert (domain_jit_info (domain)->static_rgctx_trampoline_hash, info, res);
 123         mono_domain_unlock (domain);
 124
 125         static_rgctx_trampolines ++;
 126
 127         return res;
 128 }
 129 #else
 130 gpointer
 131 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
 132 {
 133        /*
 134         * This shouldn't happen as all arches which support generic sharing support
 135         * static rgctx trampolines as well.
 136         */
 137        g_assert_not_reached ();
 138 }
 139 #endif
 140
 141 #ifdef MONO_ARCH_HAVE_IMT
 142
 143 /*
 144  * Either IMPL_METHOD or AOT_ADDR will be set on return.
 145  */
 146 static gpointer*
 147 #ifdef __GNUC__
 148 /*
 149  * This works against problems when compiling with gcc 4.6 on arm. The 'then' part of
 150  * this line gets executed, even when the condition is false:
 151  *              if (impl && mono_method_needs_static_rgctx_invoke (impl, FALSE))
 152  *                      *need_rgctx_tramp = TRUE;
 153  */
 154 __attribute__ ((noinline))
 155 #endif
 156         mono_convert_imt_slot_to_vtable_slot (gpointer* slot, mgreg_t *regs, guint8 *code, MonoMethod *method, gboolean lookup_aot, MonoMethod **impl_method, gboolean *need_rgctx_tramp, gboolean *variance_used, gpointer *aot_addr)
 157 {
 158         MonoObject *this_argument = mono_arch_get_this_arg_from_call (regs, code);
 159         MonoVTable *vt = this_argument->vtable;
 160         int displacement = slot - ((gpointer*)vt);
 161
 162         if (displacement > 0) {
 163                 /* slot is in the vtable, not in the IMT */
 164 #if DEBUG_IMT
 165                 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p is in the vtable, not in the IMT\n", slot);
 166 #endif
 167                 return slot;
 168         } else {
 169                 MonoMethod *imt_method = mono_arch_find_imt_method (regs, code);
 170                 MonoMethod *impl;
 171                 int interface_offset;
 172                 int imt_slot = MONO_IMT_SIZE + displacement;
 173
 174                 /*This has to be variance aware since imt_method can be from an interface that vt->klass doesn't directly implement*/
 175                 interface_offset = mono_class_interface_offset_with_variance (vt->klass, imt_method->klass, variance_used);
 176
 177                 if (interface_offset < 0) {
 178                         g_error ("%s doesn't implement interface %s\n", mono_type_get_name_full (&vt->klass->byval_arg, 0), mono_type_get_name_full (&imt_method->klass->byval_arg, 0));
 179                 }
 180                 mono_vtable_build_imt_slot (vt, mono_method_get_imt_slot (imt_method));
 181
 182                 if (imt_method->is_inflated && ((MonoMethodInflated*)imt_method)->context.method_inst) {
 183                         MonoGenericContext context = { NULL, NULL };
 184
 185                         /*
 186                          * Generic virtual method, imt_method contains the inflated interface
 187                          * method, need to get the inflated impl method.
 188                          */
 189                         /* imt_method->slot might not be set */
 190                         impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_declaring_generic_method (imt_method)->slot);
 191
 192                         if (impl->klass->generic_class)
 193                                 context.class_inst = impl->klass->generic_class->context.class_inst;
 194                         context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
 195                         impl = mono_class_inflate_generic_method (impl, &context);
 196                 } else {
 197                         /* Avoid loading metadata or creating a generic vtable if possible */
 198                         if (lookup_aot && !vt->klass->valuetype)
 199                                 *aot_addr = mono_aot_get_method_from_vt_slot (mono_domain_get (), vt, interface_offset + mono_method_get_vtable_slot (imt_method));
 200                         else
 201                                 *aot_addr = NULL;
 202                         if (*aot_addr)
 203                                 impl = NULL;
 204                         else
 205                                 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_vtable_slot (imt_method));
 206                 }
 207
 208                 if (impl && mono_method_needs_static_rgctx_invoke (impl, FALSE))
 209                         *need_rgctx_tramp = TRUE;
 210                 if (impl && impl->wrapper_type == MONO_WRAPPER_MANAGED_TO_MANAGED) {
 211                         WrapperInfo *info = mono_marshal_get_wrapper_info (impl);
 212
 213                         if (info && info->subtype == WRAPPER_SUBTYPE_GENERIC_ARRAY_HELPER) {
 214                                 *need_rgctx_tramp = TRUE;
 215                         }
 216                 }
 217
 218                 *impl_method = impl;
 219 #if DEBUG_IMT
 220                 printf ("mono_convert_imt_slot_to_vtable_slot: method = %s.%s.%s, imt_method = %s.%s.%s\n",
 221                                 method->klass->name_space, method->klass->name, method->name,
 222                                 imt_method->klass->name_space, imt_method->klass->name, imt_method->name);
 223 #endif
 224
 225                 g_assert (imt_slot < MONO_IMT_SIZE);
 226                 if (vt->imt_collisions_bitmap & (1 << imt_slot)) {
 227                         int slot = mono_method_get_vtable_index (imt_method);
 228                         int vtable_offset;
 229                         gpointer *vtable_slot;
 230
 231                         g_assert (slot != -1);
 232                         vtable_offset = interface_offset + slot;
 233                         vtable_slot = & (vt->vtable [vtable_offset]);
 234 #if DEBUG_IMT
 235                         printf ("mono_convert_imt_slot_to_vtable_slot: slot %p[%d] is in the IMT, and colliding becomes %p[%d] (interface_offset = %d, method->slot = %d)\n", slot, imt_slot, vtable_slot, vtable_offset, interface_offset, imt_method->slot);
 236 #endif
 237                         return vtable_slot;
 238                 } else {
 239 #if DEBUG_IMT
 240                         printf ("mono_convert_imt_slot_to_vtable_slot: slot %p[%d] is in the IMT, but not colliding\n", slot, imt_slot);
 241 #endif
 242                         return slot;
 243                 }
 244         }
 245 }
 246 #endif
 247
 248 /*
 249  * This is a super-ugly hack to fix bug #616463.
 250  *
 251  * The problem is that we don't always set is_generic for generic
 252  * method definitions.  See the comment at the end of
 253  * mono_class_inflate_generic_method_full_checked() in class.c.
 254  */
 255 static gboolean
 256 is_generic_method_definition (MonoMethod *m)
 257 {
 258         MonoGenericContext *context;
 259         if (m->is_generic)
 260                 return TRUE;
 261         if (!m->is_inflated)
 262                 return FALSE;
 263
 264         context = mono_method_get_context (m);
 265         if (!context->method_inst)
 266                 return FALSE;
 267         if (context->method_inst == mono_method_get_generic_container (((MonoMethodInflated*)m)->declaring)->context.method_inst)
 268                 return TRUE;
 269         return FALSE;
 270 }
 271
 272 gboolean
 273 mini_jit_info_is_gsharedvt (MonoJitInfo *ji)
 274 {
 275         if (ji && ji->has_generic_jit_info && (mono_jit_info_get_generic_sharing_context (ji)->var_is_vt ||
 276                                                                                    mono_jit_info_get_generic_sharing_context (ji)->mvar_is_vt))
 277                 return TRUE;
 278         else
 279                 return FALSE;
 280 }
 281
 282 /**
 283  * mini_add_method_trampoline:
 284  * @orig_method: the method the caller originally called i.e. an iface method, or NULL.
 285  * @m:
 286  * @compiled_method:
 287  * @add_static_rgctx_tramp: adds a static rgctx trampoline
 288  * @add_unbox_tramp: adds an unboxing trampoline
 289  *
 290  * Add static rgctx/gsharedvt_in/unbox trampolines to
 291  * M/COMPILED_METHOD if needed.
 292  *
 293  * Returns the trampoline address, or COMPILED_METHOD if no trampoline
 294  * is needed.
 295  */
 296 gpointer
 297 mini_add_method_trampoline (MonoMethod *orig_method, MonoMethod *m, gpointer compiled_method, gboolean add_static_rgctx_tramp, gboolean add_unbox_tramp)
 298 {
 299         gpointer addr = compiled_method;
 300         gboolean callee_gsharedvt, callee_array_helper;
 301         MonoMethod *jmethod = NULL;
 302         MonoJitInfo *ji;
 303
 304         // FIXME: This loads information from AOT (perf problem)
 305         ji = mini_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (compiled_method), NULL);
 306         callee_gsharedvt = mini_jit_info_is_gsharedvt (ji);
 307
 308         callee_array_helper = FALSE;
 309         if (m->wrapper_type == MONO_WRAPPER_MANAGED_TO_MANAGED) {
 310                 WrapperInfo *info = mono_marshal_get_wrapper_info (m);
 311
 312                 /*
 313                  * generic array helpers.
 314                  * Have to replace the wrappers with the original generic instances.
 315                  */
 316                 if (info && info->subtype == WRAPPER_SUBTYPE_GENERIC_ARRAY_HELPER) {
 317                         callee_array_helper = TRUE;
 318                         m = info->d.generic_array_helper.method;
 319                 }
 320         } else if (m->wrapper_type == MONO_WRAPPER_UNKNOWN) {
 321                 WrapperInfo *info = mono_marshal_get_wrapper_info (m);
 322
 323                 /* Same for synchronized inner wrappers */
 324                 if (info && info->subtype == WRAPPER_SUBTYPE_SYNCHRONIZED_INNER) {
 325                         m = info->d.synchronized_inner.method;
 326                 }
 327         }
 328
 329         if (!orig_method)
 330                 orig_method = m;
 331
 332         if (callee_gsharedvt)
 333                 g_assert (m->is_inflated);
 334
 335         addr = compiled_method;
 336
 337         if (add_unbox_tramp) {
 338                 /*
 339                  * The unbox trampolines call the method directly, so need to add
 340                  * an rgctx tramp before them.
 341                  */
 342                 if (mono_aot_only) {
 343                         addr = mono_aot_get_unbox_trampoline (m);
 344                 } else {
 345                         unbox_trampolines ++;
 346                         addr = mono_arch_get_unbox_trampoline (m, addr);
 347                 }
 348         }
 349
 350         if (ji)
 351                 jmethod = jinfo_get_method (ji);
 352         if (callee_gsharedvt && mini_is_gsharedvt_variable_signature (mono_method_signature (jmethod))) {
 353                 MonoGenericSharingContext *gsctx;
 354                 MonoMethodSignature *sig, *gsig;
 355
 356                 /* Here m is a generic instance, while ji->method is the gsharedvt method implementing it */
 357
 358                 /* Call from normal/gshared code to gsharedvt code with variable signature */
 359                 gsctx = mono_jit_info_get_generic_sharing_context (ji);
 360
 361                 sig = mono_method_signature (m);
 362                 gsig = mono_method_signature (jmethod);
 363
 364                 addr = mini_get_gsharedvt_wrapper (TRUE, addr, sig, gsig, gsctx, -1, FALSE);
 365
 366                 //printf ("IN: %s\n", mono_method_full_name (m, TRUE));
 367         }
 368
 369         if (callee_array_helper) {
 370                 add_static_rgctx_tramp = FALSE;
 371                 /* FIXME: ji->from_aot is not set for llvm methods */
 372                 if (ji && (ji->from_aot || mono_aot_only)) {
 373                         /* In AOT mode, compiled_method points to one of the InternalArray methods in Array. */
 374                         if (mono_method_needs_static_rgctx_invoke (jinfo_get_method (ji), TRUE))
 375                                 add_static_rgctx_tramp = TRUE;
 376                 }
 377         }
 378
 379         if (add_static_rgctx_tramp)
 380                 addr = mono_create_static_rgctx_trampoline (m, addr);
 381
 382         return addr;
 383 }
 384
 385 /**
 386  * common_call_trampoline:
 387  *
 388  *   The code to handle normal, virtual, and interface method calls and jumps, both
 389  * from JITted and LLVM compiled code.
 390  */
 391 static gpointer
 392 common_call_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8* tramp, MonoVTable *vt, gpointer *vtable_slot, gboolean need_rgctx_tramp)
 393 {
 394         gpointer addr, compiled_method;
 395         gboolean generic_shared = FALSE;
 396         gboolean need_unbox_tramp = FALSE;
 397         MonoMethod *declaring = NULL;
 398         MonoMethod *generic_virtual = NULL, *variant_iface = NULL, *orig_method = NULL;
 399         int context_used;
 400         gboolean virtual, variance_used = FALSE;
 401         gpointer *orig_vtable_slot, *vtable_slot_to_patch = NULL;
 402         MonoJitInfo *ji = NULL;
 403
 404         virtual = (gpointer)vtable_slot > (gpointer)vt;
 405
 406         orig_vtable_slot = vtable_slot;
 407         vtable_slot_to_patch = vtable_slot;
 408
 409 #ifdef MONO_ARCH_HAVE_IMT
 410         /* IMT call */
 411         if (vt && (gpointer)vtable_slot < (gpointer)vt) {
 412                 MonoMethod *impl_method = NULL;
 413                 MonoObject *this_arg;
 414
 415                 /* we get the interface method because mono_convert_imt_slot_to_vtable_slot ()
 416                  * needs the signature to be able to find the this argument
 417                  */
 418                 m = mono_arch_find_imt_method (regs, code);
 419                 vtable_slot = orig_vtable_slot;
 420                 g_assert (vtable_slot);
 421
 422                 orig_method = m;
 423
 424                 this_arg = mono_arch_get_this_arg_from_call (regs, code);
 425
 426                 if (mono_object_is_transparent_proxy (this_arg)) {
 427                         /* Use the slow path for now */
 428                     m = mono_object_get_virtual_method (this_arg, m);
 429                         vtable_slot_to_patch = NULL;
 430                 } else {
 431                         gboolean lookup_aot;
 432
 433                         mono_class_interface_offset_with_variance (vt->klass, m->klass, &variance_used);
 434
 435                         if (m->is_inflated && ((MonoMethodInflated*)m)->context.method_inst) {
 436                                 /* Generic virtual method */
 437                                 generic_virtual = m;
 438                                 need_rgctx_tramp = TRUE;
 439                         } else if (variance_used && mono_class_has_variant_generic_params (m->klass)) {
 440                                 variant_iface = m;
 441                         }
 442
 443                         addr = NULL;
 444                         /* We can only use the AOT compiled code if we don't require further processing */
 445                         lookup_aot = !generic_virtual & !variant_iface;
 446                         vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, lookup_aot, &impl_method, &need_rgctx_tramp, &variance_used, &addr);
 447                         /* This is the vcall slot which gets called through the IMT thunk */
 448                         vtable_slot_to_patch = vtable_slot;
 449                         /* mono_convert_imt_slot_to_vtable_slot () also gives us the method that is supposed
 450                          * to be called, so we compile it and go ahead as usual.
 451                          */
 452                         /*g_print ("imt found method %p (%s) at %p\n", impl_method, impl_method->name, code);*/
 453
 454                         if (addr) {
 455                                 /*
 456                                  * We found AOT compiled code for the method, skip the rest.
 457                                  */
 458                                 if (mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))
 459                                         *vtable_slot = addr;
 460
 461                                 return mono_create_ftnptr (mono_domain_get (), addr);
 462                         }
 463
 464                         m = impl_method;
 465                 }
 466         }
 467 #endif
 468
 469         /*
 470          * The virtual check is needed because is_generic_method_definition (m) could
 471          * return TRUE for methods used in IMT calls too.
 472          */
 473         if (virtual && is_generic_method_definition (m)) {
 474                 MonoGenericContext context = { NULL, NULL };
 475                 MonoMethod *declaring;
 476
 477                 if (m->is_inflated)
 478                         declaring = mono_method_get_declaring_generic_method (m);
 479                 else
 480                         declaring = m;
 481
 482                 if (m->klass->generic_class)
 483                         context.class_inst = m->klass->generic_class->context.class_inst;
 484                 else
 485                         g_assert (!m->klass->generic_container);
 486
 487 #ifdef MONO_ARCH_HAVE_IMT
 488                 generic_virtual = mono_arch_find_imt_method (regs, code);
 489 #endif
 490                 if (generic_virtual) {
 491                         g_assert (generic_virtual->is_inflated);
 492                         context.method_inst = ((MonoMethodInflated*)generic_virtual)->context.method_inst;
 493                 }
 494
 495                 m = mono_class_inflate_generic_method (declaring, &context);
 496                 /* FIXME: only do this if the method is sharable */
 497                 need_rgctx_tramp = TRUE;
 498         } else if ((context_used = mono_method_check_context_used (m))) {
 499                 MonoClass *klass = NULL;
 500                 MonoMethod *actual_method = NULL;
 501                 MonoVTable *vt = NULL;
 502                 MonoGenericInst *method_inst = NULL;
 503
 504                 vtable_slot = NULL;
 505                 generic_shared = TRUE;
 506
 507                 g_assert (code);
 508
 509                 if (m->is_inflated && mono_method_get_context (m)->method_inst) {
 510 #ifdef MONO_ARCH_RGCTX_REG
 511                         MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext*)mono_arch_find_static_call_vtable (regs, code);
 512
 513                         klass = mrgctx->class_vtable->klass;
 514                         method_inst = mrgctx->method_inst;
 515 #else
 516                         g_assert_not_reached ();
 517 #endif
 518                 } else if ((m->flags & METHOD_ATTRIBUTE_STATIC) || m->klass->valuetype) {
 519 #ifdef MONO_ARCH_RGCTX_REG
 520                         MonoVTable *vtable = mono_arch_find_static_call_vtable (regs, code);
 521
 522                         klass = vtable->klass;
 523 #else
 524                         g_assert_not_reached ();
 525 #endif
 526                 } else {
 527 #ifdef MONO_ARCH_HAVE_IMT
 528                         MonoObject *this_argument = mono_arch_get_this_arg_from_call (regs, code);
 529
 530                         vt = this_argument->vtable;
 531                         vtable_slot = orig_vtable_slot;
 532
 533                         g_assert (this_argument->vtable->klass->inited);
 534                         //mono_class_init (this_argument->vtable->klass);
 535
 536                         if (!vtable_slot) {
 537                                 mono_class_setup_supertypes (this_argument->vtable->klass);
 538                                 klass = this_argument->vtable->klass->supertypes [m->klass->idepth - 1];
 539                         }
 540 #else
 541                         NOT_IMPLEMENTED;
 542 #endif
 543                 }
 544
 545                 g_assert (vtable_slot || klass);
 546
 547                 if (vtable_slot) {
 548                         int displacement = vtable_slot - ((gpointer*)vt);
 549
 550                         g_assert_not_reached ();
 551
 552                         g_assert (displacement > 0);
 553
 554                         actual_method = vt->klass->vtable [displacement];
 555                 }
 556
 557                 if (method_inst || m->wrapper_type) {
 558                         MonoGenericContext context = { NULL, NULL };
 559
 560                         if (m->is_inflated)
 561                                 declaring = mono_method_get_declaring_generic_method (m);
 562                         else
 563                                 declaring = m;
 564
 565                         if (klass->generic_class)
 566                                 context.class_inst = klass->generic_class->context.class_inst;
 567                         else if (klass->generic_container)
 568                                 context.class_inst = klass->generic_container->context.class_inst;
 569                         context.method_inst = method_inst;
 570
 571                         actual_method = mono_class_inflate_generic_method (declaring, &context);
 572                 } else {
 573                         actual_method = mono_class_get_method_generic (klass, m);
 574                 }
 575
 576                 g_assert (klass);
 577                 g_assert (actual_method);
 578                 g_assert (actual_method->klass == klass);
 579
 580                 if (actual_method->is_inflated)
 581                         declaring = mono_method_get_declaring_generic_method (actual_method);
 582                 else
 583                         declaring = NULL;
 584
 585                 m = actual_method;
 586         }
 587
 588         if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
 589                 m = mono_marshal_get_synchronized_wrapper (m);
 590                 need_rgctx_tramp = FALSE;
 591         }
 592
 593         /* Calls made through delegates on platforms without delegate trampolines */
 594         if (!code && mono_method_needs_static_rgctx_invoke (m, FALSE))
 595                 need_rgctx_tramp = TRUE;
 596
 597         addr = compiled_method = mono_compile_method (m);
 598         g_assert (addr);
 599
 600         if (generic_virtual || variant_iface) {
 601                 if (vt->klass->valuetype) /*FIXME is this required variant iface?*/
 602                         need_unbox_tramp = TRUE;
 603         } else if (orig_vtable_slot) {
 604                 if (m->klass->valuetype)
 605                         need_unbox_tramp = TRUE;
 606         }
 607
 608         addr = mini_add_method_trampoline (orig_method, m, compiled_method, need_rgctx_tramp, need_unbox_tramp);
 609
 610         if (generic_virtual || variant_iface) {
 611                 MonoMethod *target = generic_virtual ? generic_virtual : variant_iface;
 612
 613                 vtable_slot = orig_vtable_slot;
 614                 g_assert (vtable_slot);
 615
 616                 mono_method_add_generic_virtual_invocation (mono_domain_get (),
 617                                                                                                         vt, vtable_slot,
 618                                                                                                         target, addr);
 619
 620                 return addr;
 621         }
 622
 623         /* the method was jumped to */
 624         if (!code) {
 625                 MonoDomain *domain = mono_domain_get ();
 626
 627                 /* Patch the got entries pointing to this method */
 628                 /*
 629                  * We do this here instead of in mono_codegen () to cover the case when m
 630                  * was loaded from an aot image.
 631                  */
 632                 if (domain_jit_info (domain)->jump_target_got_slot_hash) {
 633                         GSList *list, *tmp;
 634
 635                         mono_domain_lock (domain);
 636                         list = g_hash_table_lookup (domain_jit_info (domain)->jump_target_got_slot_hash, m);
 637                         if (list) {
 638                                 for (tmp = list; tmp; tmp = tmp->next) {
 639                                         gpointer *got_slot = tmp->data;
 640                                         *got_slot = addr;
 641                                 }
 642                                 g_hash_table_remove (domain_jit_info (domain)->jump_target_got_slot_hash, m);
 643                                 g_slist_free (list);
 644                         }
 645                         mono_domain_unlock (domain);
 646                 }
 647
 648                 return addr;
 649         }
 650
 651         vtable_slot = orig_vtable_slot;
 652
 653         if (vtable_slot) {
 654                 if (vtable_slot_to_patch && (mono_aot_is_got_entry (code, (guint8*)vtable_slot_to_patch) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot_to_patch))) {
 655                         g_assert (*vtable_slot_to_patch);
 656                         *vtable_slot_to_patch = mono_get_addr_from_ftnptr (addr);
 657                 }
 658         }
 659         else {
 660                 guint8 *plt_entry = mono_aot_get_plt_entry (code);
 661                 gboolean no_patch = FALSE;
 662                 MonoJitInfo *target_ji;
 663
 664                 if (plt_entry) {
 665                         if (generic_shared) {
 666                                 target_ji =
 667                                         mini_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (compiled_method), NULL);
 668                                 if (!ji)
 669                                         ji = mini_jit_info_table_find (mono_domain_get (), (char*)code, NULL);
 670
 671                                 if (ji && target_ji && generic_shared && ji->has_generic_jit_info && !target_ji->has_generic_jit_info) {
 672                                         no_patch = TRUE;
 673                                 }
 674                         }
 675                         if (!no_patch)
 676                                 mono_aot_patch_plt_entry (code, plt_entry, NULL, regs, addr);
 677                 } else {
 678                         if (generic_shared) {
 679                                 if (m->wrapper_type != MONO_WRAPPER_NONE)
 680                                         m = mono_marshal_method_from_wrapper (m);
 681                                 //g_assert (mono_method_is_generic_sharable (m, FALSE));
 682                         }
 683
 684                         /* Patch calling code */
 685                         target_ji =
 686                                 mini_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (compiled_method), NULL);
 687                         if (!ji)
 688                                 ji = mini_jit_info_table_find (mono_domain_get (), (char*)code, NULL);
 689
 690                         if (ji && target_ji && generic_shared && ji->has_generic_jit_info && !target_ji->has_generic_jit_info) {
 691                                 /*
 692                                  * Can't patch the call as the caller is gshared, but the callee is not. Happens when
 693                                  * generic sharing fails.
 694                                  * FIXME: Performance problem.
 695                                  */
 696                                 no_patch = TRUE;
 697                         }
 698
 699                         if (!no_patch && mono_method_same_domain (ji, target_ji))
 700                                 mono_arch_patch_callsite (ji->code_start, code, addr);
 701                 }
 702         }
 703
 704         return addr;
 705 }
 706
 707 /**
 708  * mono_magic_trampoline:
 709  *
 710  * This trampoline handles normal calls from JITted code.
 711  */
 712 gpointer
 713 mono_magic_trampoline (mgreg_t *regs, guint8 *code, gpointer arg, guint8* tramp)
 714 {
 715         trampoline_calls ++;
 716
 717         return common_call_trampoline (regs, code, arg, tramp, NULL, NULL, FALSE);
 718 }
 719
 720 /**
 721  * mono_vcall_trampoline:
 722  *
 723  * This trampoline handles virtual calls.
 724  */
 725 static gpointer
 726 mono_vcall_trampoline (mgreg_t *regs, guint8 *code, int slot, guint8 *tramp)
 727 {
 728         MonoObject *this;
 729         MonoVTable *vt;
 730         gpointer *vtable_slot;
 731         MonoMethod *m;
 732         gboolean need_rgctx_tramp = FALSE;
 733         gpointer addr;
 734
 735         trampoline_calls ++;
 736
 737         /*
 738          * We need to obtain the following pieces of information:
 739          * - the method which needs to be compiled.
 740          * - the vtable slot.
 741          * We use one vtable trampoline per vtable slot index, so we need only the vtable,
 742          * the other two can be computed from the vtable + the slot index.
 743          */
 744 #ifndef MONO_ARCH_THIS_AS_FIRST_ARG
 745         /* All architectures should support this */
 746         g_assert_not_reached ();
 747 #endif
 748
 749         /*
 750          * Obtain the vtable from the 'this' arg.
 751          */
 752         this = mono_arch_get_this_arg_from_call (regs, code);
 753         g_assert (this);
 754
 755         vt = this->vtable;
 756
 757         if (slot >= 0) {
 758                 /* Normal virtual call */
 759                 vtable_slot = &(vt->vtable [slot]);
 760
 761                 /* Avoid loading metadata or creating a generic vtable if possible */
 762                 addr = mono_aot_get_method_from_vt_slot (mono_domain_get (), vt, slot);
 763                 if (addr && !vt->klass->valuetype) {
 764                         if (mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))
 765                                 *vtable_slot = addr;
 766
 767                         return mono_create_ftnptr (mono_domain_get (), addr);
 768                 }
 769
 770                 /*
 771                  * Bug #616463 (see
 772                  * is_generic_method_definition() above) also
 773                  * goes away if we do a
 774                  * mono_class_setup_vtable (vt->klass) here,
 775                  * because we then inflate the method
 776                  * correctly, put it in the cache, and the
 777                  * "wrong" inflation invocation still looks up
 778                  * the correctly inflated method.
 779                  *
 780                  * The hack above seems more stable and
 781                  * trustworthy.
 782                  */
 783                 m = mono_class_get_vtable_entry (vt->klass, slot);
 784
 785                 need_rgctx_tramp = mono_method_needs_static_rgctx_invoke (m, 0);
 786         } else {
 787                 /* IMT call */
 788                 vtable_slot = &(((gpointer*)vt) [slot]);
 789
 790                 m = NULL;
 791                 need_rgctx_tramp = FALSE;
 792         }
 793
 794         return common_call_trampoline (regs, code, m, tramp, vt, vtable_slot, need_rgctx_tramp);
 795 }
 796
 797 #ifndef DISABLE_REMOTING
 798 gpointer
 799 mono_generic_virtual_remoting_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
 800 {
 801         MonoGenericContext context = { NULL, NULL };
 802         MonoMethod *imt_method, *declaring;
 803         gpointer addr;
 804
 805         trampoline_calls ++;
 806
 807         g_assert (m->is_generic);
 808
 809         if (m->is_inflated)
 810                 declaring = mono_method_get_declaring_generic_method (m);
 811         else
 812                 declaring = m;
 813
 814         if (m->klass->generic_class)
 815                 context.class_inst = m->klass->generic_class->context.class_inst;
 816         else
 817                 g_assert (!m->klass->generic_container);
 818
 819 #ifdef MONO_ARCH_HAVE_IMT
 820         imt_method = mono_arch_find_imt_method (regs, code);
 821         if (imt_method->is_inflated)
 822                 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
 823 #endif
 824         m = mono_class_inflate_generic_method (declaring, &context);
 825         m = mono_marshal_get_remoting_invoke_with_check (m);
 826
 827         addr = mono_compile_method (m);
 828         g_assert (addr);
 829
 830         return addr;
 831 }
 832 #endif
 833
 834 /**
 835  * mono_aot_trampoline:
 836  *
 837  * This trampoline handles calls made from AOT code. We try to bypass the
 838  * normal JIT compilation logic to avoid loading the metadata for the method.
 839  */
 840 #ifdef MONO_ARCH_AOT_SUPPORTED
 841 gpointer
 842 mono_aot_trampoline (mgreg_t *regs, guint8 *code, guint8 *token_info,
 843                                          guint8* tramp)
 844 {
 845         MonoImage *image;
 846         guint32 token;
 847         MonoMethod *method = NULL;
 848         gpointer addr;
 849         guint8 *plt_entry;
 850
 851         trampoline_calls ++;
 852
 853         image = *(gpointer*)(gpointer)token_info;
 854         token_info += sizeof (gpointer);
 855         token = *(guint32*)(gpointer)token_info;
 856
 857         addr = mono_aot_get_method_from_token (mono_domain_get (), image, token);
 858         if (!addr) {
 859                 method = mono_get_method (image, token, NULL);
 860                 g_assert (method);
 861
 862                 /* Use the generic code */
 863                 return mono_magic_trampoline (regs, code, method, tramp);
 864         }
 865
 866         addr = mono_create_ftnptr (mono_domain_get (), addr);
 867
 868         /* This is a normal call through a PLT entry */
 869         plt_entry = mono_aot_get_plt_entry (code);
 870         g_assert (plt_entry);
 871
 872         mono_aot_patch_plt_entry (code, plt_entry, NULL, regs, addr);
 873
 874         return addr;
 875 }
 876
 877 /*
 878  * mono_aot_plt_trampoline:
 879  *
 880  *   This trampoline handles calls made from AOT code through the PLT table.
 881  */
 882 gpointer
 883 mono_aot_plt_trampoline (mgreg_t *regs, guint8 *code, guint8 *aot_module,
 884                                                  guint8* tramp)
 885 {
 886         guint32 plt_info_offset = mono_aot_get_plt_info_offset (regs, code);
 887         gpointer res;
 888
 889         trampoline_calls ++;
 890
 891         res = mono_aot_plt_resolve (aot_module, plt_info_offset, code);
 892         if (!res) {
 893                 if (mono_loader_get_last_error ())
 894                         mono_raise_exception (mono_loader_error_prepare_exception (mono_loader_get_last_error ()));
 895                 // FIXME: Error handling (how ?)
 896                 g_assert (res);
 897         }
 898
 899         return res;
 900 }
 901 #endif
 902
 903 /**
 904  * mono_class_init_trampoline:
 905  *
 906  * This method calls mono_runtime_class_init () to run the static constructor
 907  * for the type, then patches the caller code so it is not called again.
 908  */
 909 void
 910 mono_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
 911 {
 912         guint8 *plt_entry = mono_aot_get_plt_entry (code);
 913
 914         trampoline_calls ++;
 915
 916         mono_runtime_class_init (vtable);
 917
 918         if (vtable->initialized) {
 919                 if (plt_entry)
 920                         mono_aot_patch_plt_entry (code, plt_entry, NULL, regs, mini_get_nullified_class_init_trampoline ());
 921                 else
 922                         mono_arch_nullify_class_init_trampoline (code, regs);
 923         }
 924 }
 925
 926 /**
 927  * mono_generic_class_init_trampoline:
 928  *
 929  * This method calls mono_runtime_class_init () to run the static constructor
 930  * for the type.
 931  */
 932 void
 933 mono_generic_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
 934 {
 935         trampoline_calls ++;
 936
 937         mono_runtime_class_init (vtable);
 938 }
 939
 940 static gpointer
 941 mono_rgctx_lazy_fetch_trampoline (mgreg_t *regs, guint8 *code, gpointer data, guint8 *tramp)
 942 {
 943 #ifdef MONO_ARCH_VTABLE_REG
 944         static gboolean inited = FALSE;
 945         static int num_lookups = 0;
 946         guint32 slot = GPOINTER_TO_UINT (data);
 947         mgreg_t *r = (mgreg_t*)regs;
 948         gpointer arg = (gpointer)(gssize)r [MONO_ARCH_VTABLE_REG];
 949         guint32 index = MONO_RGCTX_SLOT_INDEX (slot);
 950         gboolean mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 951
 952         trampoline_calls ++;
 953
 954         if (!inited) {
 955                 mono_counters_register ("RGCTX unmanaged lookups", MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_lookups);
 956                 inited = TRUE;
 957         }
 958
 959         num_lookups++;
 960
 961         if (mrgctx)
 962                 return mono_method_fill_runtime_generic_context (arg, code, index);
 963         else
 964                 return mono_class_fill_runtime_generic_context (arg, code, index);
 965 #else
 966         g_assert_not_reached ();
 967 #endif
 968 }
 969
 970 void
 971 mono_monitor_enter_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
 972 {
 973         mono_monitor_enter (obj);
 974 }
 975
 976 void
 977 mono_monitor_exit_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
 978 {
 979         mono_monitor_exit (obj);
 980 }
 981
 982 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
 983
 984 typedef struct {
 985         MonoMethod *invoke;
 986         gpointer impl_this;
 987         gpointer impl_nothis;
 988         MonoMethod *method;
 989         MonoMethodSignature *invoke_sig;
 990         MonoMethodSignature *sig;
 991         gboolean need_rgctx_tramp;
 992 } DelegateTrampInfo;
 993
 994 /*
 995  * Precompute data to speed up mono_delegate_trampoline ().
 996  * METHOD might be NULL.
 997  */
 998 static gpointer
 999 create_delegate_trampoline_data (MonoDomain *domain, MonoClass *klass, MonoMethod *method)
1000 {
1001         DelegateTrampInfo *tramp_data;
1002         MonoMethod *invoke;
1003         MonoError err;
1004
1005         // Precompute the delegate invoke impl and pass it to the delegate trampoline
1006         invoke = mono_get_delegate_invoke (klass);
1007         g_assert (invoke);
1008
1009         tramp_data = mono_domain_alloc (domain, sizeof (DelegateTrampInfo));
1010         tramp_data->invoke = invoke;
1011         tramp_data->invoke_sig = mono_method_signature (invoke);
1012         tramp_data->impl_this = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), TRUE);
1013         tramp_data->impl_nothis = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), FALSE);
1014         tramp_data->method = method;
1015         if (method) {
1016                 mono_error_init (&err);
1017                 tramp_data->sig = mono_method_signature_checked (method, &err);
1018                 tramp_data->need_rgctx_tramp = mono_method_needs_static_rgctx_invoke (method, FALSE);
1019         }
1020
1021         return tramp_data;
1022 }
1023
1024 /**
1025  * mono_delegate_trampoline:
1026  *
1027  *   This trampoline handles calls made to Delegate:Invoke ().
1028  * This is called once the first time a delegate is invoked, so it must be fast.
1029  */
1030 gpointer
1031 mono_delegate_trampoline (mgreg_t *regs, guint8 *code, gpointer *arg, guint8* tramp)
1032 {
1033         MonoDomain *domain = mono_domain_get ();
1034         MonoDelegate *delegate;
1035         MonoJitInfo *ji;
1036         MonoMethod *m;
1037         MonoMethod *method = NULL;
1038         gboolean multicast, callvirt = FALSE, closed_over_null = FALSE;
1039         gboolean need_rgctx_tramp = FALSE;
1040         gboolean need_unbox_tramp = FALSE;
1041         gboolean enable_caching = TRUE;
1042         DelegateTrampInfo *tramp_info = (DelegateTrampInfo*)arg;
1043         MonoMethod *invoke = tramp_info->invoke;
1044         guint8 *impl_this = tramp_info->impl_this;
1045         guint8 *impl_nothis = tramp_info->impl_nothis;
1046         MonoError err;
1047         MonoMethodSignature *sig;
1048         gpointer addr, compiled_method;
1049         gboolean is_remote = FALSE;
1050
1051         trampoline_calls ++;
1052
1053         /* Obtain the delegate object according to the calling convention */
1054         delegate = mono_arch_get_this_arg_from_call (regs, code);
1055
1056         if (delegate->method) {
1057                 method = delegate->method;
1058
1059                 /*
1060                  * delegate->method_ptr == NULL means the delegate was initialized by
1061                  * mini_delegate_ctor, while != NULL means it is initialized by
1062                  * mono_delegate_ctor_with_method (). In both cases, we need to add wrappers
1063                  * (ctor_with_method () does this, but it doesn't store the wrapper back into
1064                  * delegate->method).
1065                  */
1066 #ifndef DISABLE_REMOTING
1067                 if (delegate->target && delegate->target->vtable->klass == mono_defaults.transparent_proxy_class) {
1068                         is_remote = TRUE;
1069 #ifndef DISABLE_COM
1070                         if (((MonoTransparentProxy *)delegate->target)->remote_class->proxy_class != mono_class_get_com_object_class () &&
1071                            !mono_class_is_com_object (((MonoTransparentProxy *)delegate->target)->remote_class->proxy_class))
1072 #endif
1073                                 method = mono_marshal_get_remoting_invoke (method);
1074                 }
1075 #endif
1076                 if (!is_remote) {
1077                         sig = tramp_info->sig;
1078                         if (!(sig && method == tramp_info->method)) {
1079                                 mono_error_init (&err);
1080                                 sig = mono_method_signature_checked (method, &err);
1081                                 if (!sig)
1082                                         mono_error_raise_exception (&err);
1083                         }
1084
1085                         if (sig->hasthis && method->klass->valuetype) {
1086                                 if (mono_aot_only)
1087                                         need_unbox_tramp = TRUE;
1088                                 else
1089                                         method = mono_marshal_get_unbox_wrapper (method);
1090                         }
1091                 }
1092         } else {
1093                 ji = mono_jit_info_table_find (domain, mono_get_addr_from_ftnptr (delegate->method_ptr));
1094                 if (ji)
1095                         method = jinfo_get_method (ji);
1096         }
1097
1098         if (method) {
1099                 sig = tramp_info->sig;
1100                 if (!(sig && method == tramp_info->method)) {
1101                         mono_error_init (&err);
1102                         sig = mono_method_signature_checked (method, &err);
1103                         if (!sig)
1104                                 mono_error_raise_exception (&err);
1105                 }
1106
1107                 callvirt = !delegate->target && sig->hasthis;
1108                 if (callvirt)
1109                         closed_over_null = tramp_info->invoke_sig->param_count == sig->param_count;
1110
1111                 if (callvirt && !closed_over_null) {
1112                         /*
1113                          * The delegate needs to make a virtual call to the target method using its
1114                          * first argument as the receiver. This is hard to support in full-aot, so
1115                          * optimize it in some cases if possible.
1116                          * If the target method is not virtual or is in a sealed class,
1117                          * the vcall will call it directly.
1118                          * If the call doesn't return a valuetype, then the vcall uses the same calling
1119                          * convention as a normal call.
1120                          */
1121                         if (((method->klass->flags & TYPE_ATTRIBUTE_SEALED) || !(method->flags & METHOD_ATTRIBUTE_VIRTUAL)) && !MONO_TYPE_ISSTRUCT (sig->ret)) {
1122                                 callvirt = FALSE;
1123                                 enable_caching = FALSE;
1124                         }
1125                 }
1126
1127                 if (delegate->target &&
1128                         method->flags & METHOD_ATTRIBUTE_VIRTUAL &&
1129                         method->flags & METHOD_ATTRIBUTE_ABSTRACT &&
1130                         method->klass->flags & TYPE_ATTRIBUTE_ABSTRACT) {
1131                         method = mono_object_get_virtual_method (delegate->target, method);
1132                         enable_caching = FALSE;
1133                 }
1134
1135                 if (method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
1136                         method = mono_marshal_get_synchronized_wrapper (method);
1137
1138                 if (method == tramp_info->method)
1139                         need_rgctx_tramp = tramp_info->need_rgctx_tramp;
1140                 else if (mono_method_needs_static_rgctx_invoke (method, FALSE))
1141                         need_rgctx_tramp = TRUE;
1142         }
1143
1144         /*
1145          * If the called address is a trampoline, replace it with the compiled method so
1146          * further calls don't have to go through the trampoline.
1147          */
1148         if (method && !callvirt) {
1149                 /* Avoid the overhead of looking up an already compiled method if possible */
1150                 if (enable_caching && delegate->method_code && *delegate->method_code) {
1151                         delegate->method_ptr = *delegate->method_code;
1152                 } else {
1153                         compiled_method = addr = mono_compile_method (method);
1154                         addr = mini_add_method_trampoline (NULL, method, compiled_method, need_rgctx_tramp, need_unbox_tramp);
1155                         delegate->method_ptr = addr;
1156                         if (enable_caching && delegate->method_code)
1157                                 *delegate->method_code = delegate->method_ptr;
1158                 }
1159         } else {
1160                 if (need_rgctx_tramp)
1161                         delegate->method_ptr = mono_create_static_rgctx_trampoline (method, delegate->method_ptr);
1162         }
1163
1164         multicast = ((MonoMulticastDelegate*)delegate)->prev != NULL;
1165         if (!multicast && !callvirt) {
1166                 if (method && (method->flags & METHOD_ATTRIBUTE_STATIC) && mono_method_signature (method)->param_count == mono_method_signature (invoke)->param_count + 1)
1167                         /* Closed static delegate */
1168                         code = impl_this;
1169                 else
1170                         code = delegate->target ? impl_this : impl_nothis;
1171
1172                 if (code) {
1173                         delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
1174                         return code;
1175                 }
1176         }
1177
1178         /* The general, unoptimized case */
1179         m = mono_marshal_get_delegate_invoke (invoke, delegate);
1180         code = mono_compile_method (m);
1181         code = mini_add_method_trampoline (NULL, m, code, mono_method_needs_static_rgctx_invoke (m, FALSE), FALSE);
1182         delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
1183
1184         return code;
1185 }
1186
1187 #endif
1188
1189 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
1190 static gpointer
1191 mono_handler_block_guard_trampoline (mgreg_t *regs, guint8 *code, gpointer *tramp_info, guint8* tramp)
1192 {
1193         MonoContext ctx;
1194         MonoException *exc;
1195         MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1196         gpointer resume_ip = jit_tls->handler_block_return_address;
1197
1198         memcpy (&ctx, &jit_tls->handler_block_context, sizeof (MonoContext));
1199         MONO_CONTEXT_SET_IP (&ctx, jit_tls->handler_block_return_address);
1200
1201         jit_tls->handler_block_return_address = NULL;
1202         jit_tls->handler_block = NULL;
1203
1204         if (!resume_ip) /*this should not happen, but we should avoid crashing */
1205                 exc = mono_get_exception_execution_engine ("Invalid internal state, resuming abort after handler block but no resume ip found");
1206         else
1207                 exc = mono_thread_resume_interruption ();
1208
1209         if (exc) {
1210                 mono_handle_exception (&ctx, exc);
1211                 mono_restore_context (&ctx);
1212         }
1213
1214         return resume_ip;
1215 }
1216
1217 gpointer
1218 mono_create_handler_block_trampoline (void)
1219 {
1220         static gpointer code;
1221         if (code) {
1222                 mono_memory_barrier ();
1223                 return code;
1224         }
1225
1226         g_assert (!mono_aot_only);
1227
1228         mono_trampolines_lock ();
1229
1230         if (!code) {
1231                 MonoTrampInfo *info;
1232                 gpointer tmp;
1233
1234                 tmp = mono_arch_create_handler_block_trampoline (&info, FALSE);
1235                 mono_tramp_info_register (info);
1236                 mono_memory_barrier ();
1237                 code = tmp;
1238         }
1239         mono_trampolines_unlock ();
1240
1241         return code;
1242 }
1243 #endif
1244
1245 /*
1246  * mono_get_trampoline_func:
1247  *
1248  *   Return the C function which needs to be called by the generic trampoline of type
1249  * TRAMP_TYPE.
1250  */
1251 gconstpointer
1252 mono_get_trampoline_func (MonoTrampolineType tramp_type)
1253 {
1254         switch (tramp_type) {
1255         case MONO_TRAMPOLINE_JIT:
1256         case MONO_TRAMPOLINE_JUMP:
1257                 return mono_magic_trampoline;
1258         case MONO_TRAMPOLINE_CLASS_INIT:
1259                 return mono_class_init_trampoline;
1260         case MONO_TRAMPOLINE_GENERIC_CLASS_INIT:
1261                 return mono_generic_class_init_trampoline;
1262         case MONO_TRAMPOLINE_RGCTX_LAZY_FETCH:
1263                 return mono_rgctx_lazy_fetch_trampoline;
1264 #ifdef MONO_ARCH_AOT_SUPPORTED
1265         case MONO_TRAMPOLINE_AOT:
1266                 return mono_aot_trampoline;
1267         case MONO_TRAMPOLINE_AOT_PLT:
1268                 return mono_aot_plt_trampoline;
1269 #endif
1270 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1271         case MONO_TRAMPOLINE_DELEGATE:
1272                 return mono_delegate_trampoline;
1273 #endif
1274         case MONO_TRAMPOLINE_RESTORE_STACK_PROT:
1275                 return mono_altstack_restore_prot;
1276 #ifndef DISABLE_REMOTING
1277         case MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING:
1278                 return mono_generic_virtual_remoting_trampoline;
1279 #endif
1280         case MONO_TRAMPOLINE_MONITOR_ENTER:
1281                 return mono_monitor_enter_trampoline;
1282         case MONO_TRAMPOLINE_MONITOR_EXIT:
1283                 return mono_monitor_exit_trampoline;
1284         case MONO_TRAMPOLINE_VCALL:
1285                 return mono_vcall_trampoline;
1286 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
1287         case MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD:
1288                 return mono_handler_block_guard_trampoline;
1289 #endif
1290         default:
1291                 g_assert_not_reached ();
1292                 return NULL;
1293         }
1294 }
1295
1296 static guchar*
1297 create_trampoline_code (MonoTrampolineType tramp_type)
1298 {
1299         MonoTrampInfo *info;
1300         guchar *code;
1301
1302         code = mono_arch_create_generic_trampoline (tramp_type, &info, FALSE);
1303         mono_tramp_info_register (info);
1304
1305         return code;
1306 }
1307
1308 void
1309 mono_trampolines_init (void)
1310 {
1311         InitializeCriticalSection (&trampolines_mutex);
1312
1313         if (mono_aot_only)
1314                 return;
1315
1316         mono_trampoline_code [MONO_TRAMPOLINE_JIT] = create_trampoline_code (MONO_TRAMPOLINE_JIT);
1317         mono_trampoline_code [MONO_TRAMPOLINE_JUMP] = create_trampoline_code (MONO_TRAMPOLINE_JUMP);
1318         mono_trampoline_code [MONO_TRAMPOLINE_CLASS_INIT] = create_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
1319         mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_CLASS_INIT] = create_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
1320         mono_trampoline_code [MONO_TRAMPOLINE_RGCTX_LAZY_FETCH] = create_trampoline_code (MONO_TRAMPOLINE_RGCTX_LAZY_FETCH);
1321 #ifdef MONO_ARCH_AOT_SUPPORTED
1322         mono_trampoline_code [MONO_TRAMPOLINE_AOT] = create_trampoline_code (MONO_TRAMPOLINE_AOT);
1323         mono_trampoline_code [MONO_TRAMPOLINE_AOT_PLT] = create_trampoline_code (MONO_TRAMPOLINE_AOT_PLT);
1324 #endif
1325 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1326         mono_trampoline_code [MONO_TRAMPOLINE_DELEGATE] = create_trampoline_code (MONO_TRAMPOLINE_DELEGATE);
1327 #endif
1328         mono_trampoline_code [MONO_TRAMPOLINE_RESTORE_STACK_PROT] = create_trampoline_code (MONO_TRAMPOLINE_RESTORE_STACK_PROT);
1329 #ifndef DISABLE_REMOTING
1330         mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING] = create_trampoline_code (MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING);
1331 #endif
1332         mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_ENTER] = create_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
1333         mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_EXIT] = create_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
1334         mono_trampoline_code [MONO_TRAMPOLINE_VCALL] = create_trampoline_code (MONO_TRAMPOLINE_VCALL);
1335 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
1336         mono_trampoline_code [MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD] = create_trampoline_code (MONO_TRAMPOLINE_HANDLER_BLOCK_GUARD);
1337         mono_create_handler_block_trampoline ();
1338 #endif
1339
1340         mono_counters_register ("Calls to trampolines", MONO_COUNTER_JIT | MONO_COUNTER_INT, &trampoline_calls);
1341         mono_counters_register ("JIT trampolines", MONO_COUNTER_JIT | MONO_COUNTER_INT, &jit_trampolines);
1342         mono_counters_register ("Unbox trampolines", MONO_COUNTER_JIT | MONO_COUNTER_INT, &unbox_trampolines);
1343         mono_counters_register ("Static rgctx trampolines", MONO_COUNTER_JIT | MONO_COUNTER_INT, &static_rgctx_trampolines);
1344 }
1345
1346 void
1347 mono_trampolines_cleanup (void)
1348 {
1349         if (class_init_hash_addr)
1350                 g_hash_table_destroy (class_init_hash_addr);
1351         if (rgctx_lazy_fetch_trampoline_hash)
1352                 g_hash_table_destroy (rgctx_lazy_fetch_trampoline_hash);
1353         if (rgctx_lazy_fetch_trampoline_hash_addr)
1354                 g_hash_table_destroy (rgctx_lazy_fetch_trampoline_hash_addr);
1355
1356         DeleteCriticalSection (&trampolines_mutex);
1357 }
1358
1359 guint8 *
1360 mono_get_trampoline_code (MonoTrampolineType tramp_type)
1361 {
1362         g_assert (mono_trampoline_code [tramp_type]);
1363
1364         return mono_trampoline_code [tramp_type];
1365 }
1366
1367 gpointer
1368 mono_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
1369 {
1370         if (mono_aot_only)
1371                 return mono_aot_create_specific_trampoline (mono_defaults.corlib, arg1, tramp_type, domain, code_len);
1372         else
1373                 return mono_arch_create_specific_trampoline (arg1, tramp_type, domain, code_len);
1374 }
1375
1376 gpointer
1377 mono_create_class_init_trampoline (MonoVTable *vtable)
1378 {
1379         gpointer code, ptr;
1380         MonoDomain *domain = vtable->domain;
1381
1382         g_assert (!vtable->klass->generic_container);
1383
1384         /* previously created trampoline code */
1385         mono_domain_lock (domain);
1386         ptr =
1387                 g_hash_table_lookup (domain_jit_info (domain)->class_init_trampoline_hash,
1388                                                                   vtable);
1389         mono_domain_unlock (domain);
1390         if (ptr)
1391                 return ptr;
1392
1393         code = mono_create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, domain, NULL);
1394
1395         ptr = mono_create_ftnptr (domain, code);
1396
1397         /* store trampoline address */
1398         mono_domain_lock (domain);
1399         g_hash_table_insert (domain_jit_info (domain)->class_init_trampoline_hash,
1400                                                           vtable, ptr);
1401         mono_domain_unlock (domain);
1402
1403         mono_trampolines_lock ();
1404         if (!class_init_hash_addr)
1405                 class_init_hash_addr = g_hash_table_new (NULL, NULL);
1406         g_hash_table_insert (class_init_hash_addr, ptr, vtable);
1407         mono_trampolines_unlock ();
1408
1409         return ptr;
1410 }
1411
1412 gpointer
1413 mono_create_generic_class_init_trampoline (void)
1414 {
1415 #ifdef MONO_ARCH_VTABLE_REG
1416         static gpointer code;
1417         MonoTrampInfo *info;
1418
1419         mono_trampolines_lock ();
1420
1421         if (!code) {
1422                 if (mono_aot_only)
1423                         /* get_named_code () might return an ftnptr, but our caller expects a direct pointer */
1424                         code = mono_get_addr_from_ftnptr (mono_aot_get_trampoline ("generic_class_init_trampoline"));
1425                 else {
1426                         code = mono_arch_create_generic_class_init_trampoline (&info, FALSE);
1427                         mono_tramp_info_register (info);
1428                 }
1429         }
1430
1431         mono_trampolines_unlock ();
1432
1433         return code;
1434 #else
1435         g_assert_not_reached ();
1436 #endif
1437 }
1438
1439 gpointer
1440 mono_create_jump_trampoline (MonoDomain *domain, MonoMethod *method, gboolean add_sync_wrapper)
1441 {
1442         MonoJitInfo *ji;
1443         gpointer code;
1444         guint32 code_size = 0;
1445
1446         code = mono_jit_find_compiled_method_with_jit_info (domain, method, &ji);
1447         /*
1448          * We cannot recover the correct type of a shared generic
1449          * method from its native code address, so we use the
1450          * trampoline instead.
1451          * For synchronized methods, the trampoline adds the wrapper.
1452          */
1453         if (code && !ji->has_generic_jit_info && !(method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED))
1454                 return code;
1455
1456         mono_domain_lock (domain);
1457         code = g_hash_table_lookup (domain_jit_info (domain)->jump_trampoline_hash, method);
1458         mono_domain_unlock (domain);
1459         if (code)
1460                 return code;
1461
1462         code = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get (), &code_size);
1463         g_assert (code_size);
1464
1465         ji = mono_domain_alloc0 (domain, MONO_SIZEOF_JIT_INFO);
1466         ji->code_start = code;
1467         ji->code_size = code_size;
1468         ji->d.method = method;
1469
1470         /*
1471          * mono_delegate_ctor needs to find the method metadata from the
1472          * trampoline address, so we save it here.
1473          */
1474
1475         mono_jit_info_table_add (domain, ji);
1476
1477         mono_domain_lock (domain);
1478         g_hash_table_insert (domain_jit_info (domain)->jump_trampoline_hash, method, ji->code_start);
1479         mono_domain_unlock (domain);
1480
1481         return ji->code_start;
1482 }
1483
1484 gpointer
1485 mono_create_jit_trampoline_in_domain (MonoDomain *domain, MonoMethod *method)
1486 {
1487         gpointer tramp;
1488
1489         if (mono_aot_only) {
1490                 /* Avoid creating trampolines if possible */
1491                 gpointer code = mono_jit_find_compiled_method (domain, method);
1492
1493                 if (code)
1494                         return code;
1495         }
1496
1497         mono_domain_lock (domain);
1498         tramp = g_hash_table_lookup (domain_jit_info (domain)->jit_trampoline_hash, method);
1499         mono_domain_unlock (domain);
1500         if (tramp)
1501                 return tramp;
1502
1503         tramp = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JIT, domain, NULL);
1504
1505         mono_domain_lock (domain);
1506         g_hash_table_insert (domain_jit_info (domain)->jit_trampoline_hash, method, tramp);
1507         mono_domain_unlock (domain);
1508
1509         jit_trampolines++;
1510
1511         return tramp;
1512 }
1513
1514 gpointer
1515 mono_create_jit_trampoline (MonoMethod *method)
1516 {
1517         return mono_create_jit_trampoline_in_domain (mono_domain_get (), method);
1518 }
1519
1520 gpointer
1521 mono_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
1522 {
1523         gpointer tramp;
1524
1525         MonoDomain *domain = mono_domain_get ();
1526         guint8 *buf, *start;
1527
1528         buf = start = mono_domain_alloc0 (domain, 2 * sizeof (gpointer));
1529
1530         *(gpointer*)(gpointer)buf = image;
1531         buf += sizeof (gpointer);
1532         *(guint32*)(gpointer)buf = token;
1533
1534         tramp = mono_create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain, NULL);
1535
1536         jit_trampolines++;
1537
1538         return tramp;
1539 }
1540
1541
1542 /*
1543  * mono_create_delegate_trampoline_with_method:
1544  *
1545  *   Create a delegate trampoline for the KLASS+METHOD pair.
1546  */
1547 gpointer
1548 mono_create_delegate_trampoline_with_method (MonoDomain *domain, MonoClass *klass, MonoMethod *method)
1549 {
1550 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1551         gpointer ptr;
1552         guint32 code_size = 0;
1553         gpointer tramp_info;
1554         MonoClassMethodPair pair, *dpair;
1555
1556         pair.klass = klass;
1557         pair.method = method;
1558         mono_domain_lock (domain);
1559         ptr = g_hash_table_lookup (domain_jit_info (domain)->delegate_trampoline_hash, &pair);
1560         mono_domain_unlock (domain);
1561         if (ptr)
1562                 return ptr;
1563
1564         tramp_info = create_delegate_trampoline_data (domain, klass, method);
1565
1566         ptr = mono_create_specific_trampoline (tramp_info, MONO_TRAMPOLINE_DELEGATE, domain, &code_size);
1567         g_assert (code_size);
1568
1569         dpair = mono_domain_alloc0 (domain, sizeof (MonoClassMethodPair));
1570         memcpy (dpair, &pair, sizeof (MonoClassMethodPair));
1571
1572         /* store trampoline address */
1573         mono_domain_lock (domain);
1574         g_hash_table_insert (domain_jit_info (domain)->delegate_trampoline_hash, dpair, ptr);
1575         mono_domain_unlock (domain);
1576
1577         return ptr;
1578 #else
1579         return NULL;
1580 #endif
1581 }
1582
1583 gpointer
1584 mono_create_delegate_trampoline (MonoDomain *domain, MonoClass *klass)
1585 {
1586         return mono_create_delegate_trampoline_with_method (domain, klass, NULL);
1587 }
1588
1589 gpointer
1590 mono_create_rgctx_lazy_fetch_trampoline (guint32 offset)
1591 {
1592         static gboolean inited = FALSE;
1593         static int num_trampolines = 0;
1594         MonoTrampInfo *info;
1595
1596         gpointer tramp, ptr;
1597
1598         mono_trampolines_lock ();
1599         if (rgctx_lazy_fetch_trampoline_hash)
1600                 tramp = g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset));
1601         else
1602                 tramp = NULL;
1603         mono_trampolines_unlock ();
1604         if (tramp)
1605                 return tramp;
1606
1607         if (mono_aot_only) {
1608                 ptr = mono_aot_get_lazy_fetch_trampoline (offset);
1609         } else {
1610                 tramp = mono_arch_create_rgctx_lazy_fetch_trampoline (offset, &info, FALSE);
1611                 mono_tramp_info_register (info);
1612                 ptr = mono_create_ftnptr (mono_get_root_domain (), tramp);
1613         }
1614
1615         mono_trampolines_lock ();
1616         if (!rgctx_lazy_fetch_trampoline_hash) {
1617                 rgctx_lazy_fetch_trampoline_hash = g_hash_table_new (NULL, NULL);
1618                 rgctx_lazy_fetch_trampoline_hash_addr = g_hash_table_new (NULL, NULL);
1619         }
1620         g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset), ptr);
1621         g_assert (offset != -1);
1622         g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash_addr, ptr, GUINT_TO_POINTER (offset + 1));
1623         mono_trampolines_unlock ();
1624
1625         if (!inited) {
1626                 mono_counters_register ("RGCTX num lazy fetch trampolines",
1627                                 MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_trampolines);
1628                 inited = TRUE;
1629         }
1630         num_trampolines++;
1631
1632         return ptr;
1633 }
1634
1635 gpointer
1636 mono_create_monitor_enter_trampoline (void)
1637 {
1638         static gpointer code;
1639
1640         if (mono_aot_only) {
1641                 if (!code)
1642                         code = mono_aot_get_trampoline ("monitor_enter_trampoline");
1643                 return code;
1644         }
1645
1646 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1647         mono_trampolines_lock ();
1648
1649         if (!code) {
1650                 MonoTrampInfo *info;
1651
1652                 code = mono_arch_create_monitor_enter_trampoline (&info, FALSE);
1653                 mono_tramp_info_register (info);
1654         }
1655
1656         mono_trampolines_unlock ();
1657 #else
1658         code = NULL;
1659         g_assert_not_reached ();
1660 #endif
1661
1662         return code;
1663 }
1664
1665 gpointer
1666 mono_create_monitor_exit_trampoline (void)
1667 {
1668         static gpointer code;
1669
1670         if (mono_aot_only) {
1671                 if (!code)
1672                         code = mono_aot_get_trampoline ("monitor_exit_trampoline");
1673                 return code;
1674         }
1675
1676 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1677         mono_trampolines_lock ();
1678
1679         if (!code) {
1680                 MonoTrampInfo *info;
1681
1682                 code = mono_arch_create_monitor_exit_trampoline (&info, FALSE);
1683                 mono_tramp_info_register (info);
1684         }
1685
1686         mono_trampolines_unlock ();
1687 #else
1688         code = NULL;
1689         g_assert_not_reached ();
1690 #endif
1691         return code;
1692 }
1693
1694 #ifdef MONO_ARCH_LLVM_SUPPORTED
1695 /*
1696  * mono_create_llvm_imt_trampoline:
1697  *
1698  *   LLVM compiled code can't pass in the IMT argument, so we use this trampoline, which
1699  * sets the IMT argument, then branches to the contents of the vtable slot given by
1700  * vt_offset in the vtable which is obtained from the argument list.
1701  */
1702 gpointer
1703 mono_create_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
1704 {
1705 #ifdef MONO_ARCH_HAVE_LLVM_IMT_TRAMPOLINE
1706         return mono_arch_get_llvm_imt_trampoline (domain, m, vt_offset);
1707 #else
1708         g_assert_not_reached ();
1709         return NULL;
1710 #endif
1711 }
1712 #endif
1713
1714 MonoVTable*
1715 mono_find_class_init_trampoline_by_addr (gconstpointer addr)
1716 {
1717         MonoVTable *res;
1718
1719         mono_trampolines_lock ();
1720         if (class_init_hash_addr)
1721                 res = g_hash_table_lookup (class_init_hash_addr, addr);
1722         else
1723                 res = NULL;
1724         mono_trampolines_unlock ();
1725         return res;
1726 }
1727
1728 guint32
1729 mono_find_rgctx_lazy_fetch_trampoline_by_addr (gconstpointer addr)
1730 {
1731         int offset;
1732
1733         mono_trampolines_lock ();
1734         if (rgctx_lazy_fetch_trampoline_hash_addr) {
1735                 /* We store the real offset + 1 so we can detect when the lookup fails */
1736                 offset = GPOINTER_TO_INT (g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash_addr, addr));
1737                 if (offset)
1738                         offset -= 1;
1739                 else
1740                         offset = -1;
1741         } else {
1742                 offset = -1;
1743         }
1744         mono_trampolines_unlock ();
1745         return offset;
1746 }
1747
1748 static const char*tramp_names [MONO_TRAMPOLINE_NUM] = {
1749         "jit",
1750         "jump",
1751         "class_init",
1752         "generic_class_init",
1753         "rgctx_lazy_fetch",
1754         "aot",
1755         "aot_plt",
1756         "delegate",
1757         "restore_stack_prot",
1758         "generic_virtual_remoting",
1759         "monitor_enter",
1760         "monitor_exit",
1761         "vcall",
1762         "handler_block_guard"
1763 };
1764
1765 /*
1766  * mono_get_generic_trampoline_name:
1767  *
1768  *   Returns a pointer to malloc-ed memory.
1769  */
1770 char*
1771 mono_get_generic_trampoline_name (MonoTrampolineType tramp_type)
1772 {
1773         return g_strdup_printf ("generic_trampoline_%s", tramp_names [tramp_type]);
1774 }
1775
1776 /*
1777  * mono_get_rgctx_fetch_trampoline_name:
1778  *
1779  *   Returns a pointer to malloc-ed memory.
1780  */
1781 char*
1782 mono_get_rgctx_fetch_trampoline_name (int slot)
1783 {
1784         gboolean mrgctx;
1785         int index;
1786
1787         mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
1788         index = MONO_RGCTX_SLOT_INDEX (slot);
1789
1790         return g_strdup_printf ("rgctx_fetch_trampoline_%s_%d", mrgctx ? "mrgctx" : "rgctx", index);
1791 }
1792
1793 gpointer
1794 mini_get_nullified_class_init_trampoline (void)
1795 {
1796         static gpointer nullified_class_init_trampoline;
1797
1798         if (!nullified_class_init_trampoline) {
1799                 gpointer tramp;
1800                 MonoTrampInfo *info;
1801
1802                 if (mono_aot_only) {
1803                         tramp = mono_aot_get_trampoline ("nullified_class_init_trampoline");
1804                 } else {
1805                         tramp = mono_arch_get_nullified_class_init_trampoline (&info);
1806                         mono_tramp_info_register (info);
1807                 }
1808                 mono_memory_barrier ();
1809                 nullified_class_init_trampoline = tramp;
1810         }
1811
1812         return nullified_class_init_trampoline;
1813 }