mono/mini/mini-trampolines.c

   1
   2 #include <config.h>
   3 #include <glib.h>
   4
   5 #include <mono/metadata/appdomain.h>
   6 #include <mono/metadata/metadata-internals.h>
   7 #include <mono/metadata/marshal.h>
   8 #include <mono/metadata/tabledefs.h>
   9 #include <mono/utils/mono-counters.h>
  10 #include <mono/utils/mono-error-internals.h>
  11
  12 #include "mini.h"
  13 #include "debug-mini.h"
  14
  15 /*
  16  * Address of the trampoline code.  This is used by the debugger to check
  17  * whether a method is a trampoline.
  18  */
  19 guint8* mono_trampoline_code [MONO_TRAMPOLINE_NUM];
  20
  21 static GHashTable *class_init_hash_addr = NULL;
  22 static GHashTable *rgctx_lazy_fetch_trampoline_hash = NULL;
  23 static GHashTable *rgctx_lazy_fetch_trampoline_hash_addr = NULL;
  24 static guint32 trampoline_calls;
  25
  26 #define mono_trampolines_lock() EnterCriticalSection (&trampolines_mutex)
  27 #define mono_trampolines_unlock() LeaveCriticalSection (&trampolines_mutex)
  28 static CRITICAL_SECTION trampolines_mutex;
  29
  30 static gpointer
  31 get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr, gboolean need_rgctx_tramp)
  32 {
  33         if (mono_aot_only) {
  34                 if (need_rgctx_tramp)
  35                         /*
  36                          * The unbox trampolines call the method directly, so need to add
  37                          * an rgctx tramp before them.
  38                          */
  39                         return mono_create_static_rgctx_trampoline (m, mono_aot_get_unbox_trampoline (m));
  40                 else
  41                         return mono_aot_get_unbox_trampoline (m);
  42         } else {
  43                 return mono_arch_get_unbox_trampoline (gsctx, m, addr);
  44         }
  45 }
  46
  47 #ifdef MONO_ARCH_HAVE_STATIC_RGCTX_TRAMPOLINE
  48
  49 typedef struct {
  50         MonoMethod *m;
  51         gpointer addr;
  52 } RgctxTrampInfo;
  53
  54 static gint
  55 rgctx_tramp_info_equal (gconstpointer ka, gconstpointer kb)
  56 {
  57         const RgctxTrampInfo *i1 = ka;
  58         const RgctxTrampInfo *i2 = kb;
  59
  60         if (i1->m == i2->m && i1->addr == i2->addr)
  61                 return 1;
  62         else
  63                 return 0;
  64 }
  65
  66 static guint
  67 rgctx_tramp_info_hash (gconstpointer data)
  68 {
  69         const RgctxTrampInfo *info = data;
  70
  71         return GPOINTER_TO_UINT (info->m) ^ GPOINTER_TO_UINT (info->addr);
  72 }
  73
  74 /*
  75  * mono_create_static_rgctx_trampoline:
  76  *
  77  *   Return a static rgctx trampoline for M which branches to ADDR which should
  78  * point to the compiled code of M.
  79  *
  80  *   Static rgctx trampolines are used when a shared generic method which doesn't
  81  * have a this argument is called indirectly, ie. from code which can't pass in
  82  * the rgctx argument. The trampoline sets the rgctx argument and jumps to the
  83  * methods code. These trampolines are similar to the unbox trampolines, they
  84  * perform the same task as the static rgctx wrappers, but they are smaller/faster,
  85  * and can be made to work with full AOT.
  86  * On PPC addr should be an ftnptr and the return value is an ftnptr too.
  87  */
  88 gpointer
  89 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
  90 {
  91         gpointer ctx;
  92         gpointer res;
  93         MonoDomain *domain;
  94         RgctxTrampInfo tmp_info;
  95         RgctxTrampInfo *info;
  96
  97 #ifdef PPC_USES_FUNCTION_DESCRIPTOR
  98         g_assert (((gpointer*)addr) [2] == 0);
  99 #endif
 100
 101         if (mini_method_get_context (m)->method_inst)
 102                 ctx = mono_method_lookup_rgctx (mono_class_vtable (mono_domain_get (), m->klass), mini_method_get_context (m)->method_inst);
 103         else
 104                 ctx = mono_class_vtable (mono_domain_get (), m->klass);
 105
 106         domain = mono_domain_get ();
 107
 108         /*
 109          * In the AOT case, addr might point to either the method, or to an unbox trampoline,
 110          * so make the hash keyed on the m+addr pair.
 111          */
 112         mono_domain_lock (domain);
 113         if (!domain_jit_info (domain)->static_rgctx_trampoline_hash)
 114                 domain_jit_info (domain)->static_rgctx_trampoline_hash = g_hash_table_new (rgctx_tramp_info_hash, rgctx_tramp_info_equal);
 115         tmp_info.m = m;
 116         tmp_info.addr = addr;
 117         res = g_hash_table_lookup (domain_jit_info (domain)->static_rgctx_trampoline_hash,
 118                                                            &tmp_info);
 119         mono_domain_unlock (domain);
 120         if (res)
 121                 return res;
 122
 123         if (mono_aot_only)
 124                 res = mono_aot_get_static_rgctx_trampoline (ctx, addr);
 125         else
 126                 res = mono_arch_get_static_rgctx_trampoline (m, ctx, addr);
 127
 128         mono_domain_lock (domain);
 129         /* Duplicates inserted while we didn't hold the lock are OK */
 130         info = mono_domain_alloc (domain, sizeof (RgctxTrampInfo));
 131         info->m = m;
 132         info->addr = addr;
 133         g_hash_table_insert (domain_jit_info (domain)->static_rgctx_trampoline_hash, info, res);
 134         mono_domain_unlock (domain);
 135
 136         return res;
 137 }
 138 #else
 139 gpointer
 140 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
 141 {
 142         /*
 143          * This shouldn't happen as all arches which support generic sharing support
 144          * static rgctx trampolines as well.
 145          */
 146         g_assert_not_reached ();
 147 }
 148 #endif
 149
 150 gpointer*
 151 mono_get_vcall_slot_addr (guint8* code, mgreg_t *regs)
 152 {
 153         gpointer vt;
 154         int displacement;
 155         vt = mono_arch_get_vcall_slot (code, regs, &displacement);
 156         if (!vt)
 157                 return NULL;
 158         return (gpointer*)((char*)vt + displacement);
 159 }
 160
 161 #ifdef MONO_ARCH_HAVE_IMT
 162
 163 static gpointer*
 164 mono_convert_imt_slot_to_vtable_slot (gpointer* slot, mgreg_t *regs, guint8 *code, MonoMethod *method, MonoMethod **impl_method, gboolean *need_rgctx_tramp, gboolean *variance_used)
 165 {
 166         MonoObject *this_argument = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (method), regs, code);
 167         MonoVTable *vt = this_argument->vtable;
 168         int displacement = slot - ((gpointer*)vt);
 169
 170         if (displacement > 0) {
 171                 /* slot is in the vtable, not in the IMT */
 172 #if DEBUG_IMT
 173                 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p is in the vtable, not in the IMT\n", slot);
 174 #endif
 175                 return slot;
 176         } else {
 177                 MonoMethod *imt_method = mono_arch_find_imt_method (regs, code);
 178                 int interface_offset;
 179                 int imt_slot = MONO_IMT_SIZE + displacement;
 180
 181                 /*This has to be variance aware since imt_method can be from an interface that vt->klass doesn't directly implement*/
 182                 interface_offset = mono_class_interface_offset_with_variance (vt->klass, imt_method->klass, variance_used);
 183
 184                 if (interface_offset < 0) {
 185                         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));
 186                 }
 187                 mono_vtable_build_imt_slot (vt, mono_method_get_imt_slot (imt_method));
 188
 189                 if (impl_method) {
 190                         MonoMethod *impl;
 191
 192                         if (imt_method->is_inflated && ((MonoMethodInflated*)imt_method)->context.method_inst) {
 193                                 MonoGenericContext context = { NULL, NULL };
 194
 195                                 /*
 196                                  * Generic virtual method, imt_method contains the inflated interface
 197                                  * method, need to get the inflated impl method.
 198                                  */
 199                                 /* imt_method->slot might not be set */
 200                                 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_declaring_generic_method (imt_method)->slot);
 201
 202                                 if (impl->klass->generic_class)
 203                                         context.class_inst = impl->klass->generic_class->context.class_inst;
 204                                 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
 205                                 impl = mono_class_inflate_generic_method (impl, &context);
 206                         } else {
 207                                 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_vtable_slot (imt_method));
 208                         }
 209
 210                         if (mono_method_needs_static_rgctx_invoke (impl, FALSE))
 211                                 *need_rgctx_tramp = TRUE;
 212
 213                         *impl_method = impl;
 214 #if DEBUG_IMT
 215                 printf ("mono_convert_imt_slot_to_vtable_slot: method = %s.%s.%s, imt_method = %s.%s.%s\n",
 216                                 method->klass->name_space, method->klass->name, method->name,
 217                                 imt_method->klass->name_space, imt_method->klass->name, imt_method->name);
 218 #endif
 219                 }
 220                 g_assert (imt_slot < MONO_IMT_SIZE);
 221                 if (vt->imt_collisions_bitmap & (1 << imt_slot)) {
 222                         int slot = mono_method_get_vtable_index (imt_method);
 223                         int vtable_offset;
 224                         gpointer *vtable_slot;
 225
 226                         g_assert (slot != -1);
 227                         vtable_offset = interface_offset + slot;
 228                         vtable_slot = & (vt->vtable [vtable_offset]);
 229 #if DEBUG_IMT
 230                         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);
 231 #endif
 232                         return vtable_slot;
 233                 } else {
 234 #if DEBUG_IMT
 235                         printf ("mono_convert_imt_slot_to_vtable_slot: slot %p[%d] is in the IMT, but not colliding\n", slot, imt_slot);
 236 #endif
 237                         return slot;
 238                 }
 239         }
 240 }
 241 #endif
 242
 243 /**
 244  * common_call_trampoline:
 245  *
 246  *   The code to handle normal, virtual, and interface method calls and jumps, both
 247  * from JITted and LLVM compiled code.
 248  */
 249 static gpointer
 250 common_call_trampoline (mgreg_t *regs, guint8 *code, gpointer arg, guint8* tramp, MonoVTable *vt, gpointer *vtable_slot, gboolean need_rgctx_tramp)
 251 {
 252         gpointer addr, compiled_method;
 253         gboolean generic_shared = FALSE;
 254         MonoMethod *m;
 255         MonoMethod *declaring = NULL;
 256         MonoMethod *generic_virtual = NULL, *variant_iface = NULL;
 257         int context_used;
 258         gboolean proxy = FALSE, variance_used = FALSE;
 259         gpointer *orig_vtable_slot;
 260         MonoJitInfo *ji = NULL;
 261
 262         m = arg;
 263
 264         orig_vtable_slot = vtable_slot;
 265
 266         if (m == MONO_FAKE_VTABLE_METHOD) {
 267                 int displacement;
 268                 if (!vt) {
 269                         int i;
 270                         MonoJitInfo *ji;
 271
 272                         ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
 273                         if (ji)
 274                                 printf ("Caller: %s\n", mono_method_full_name (ji->method, TRUE));
 275                         /* Print some debug info */
 276                         for (i = 0; i < 32; ++i)
 277                                 printf ("0x%x ", code [-32 + i]);
 278                         printf ("\n");
 279                         g_assert (vt);
 280                 }
 281                 displacement = (guint8*)vtable_slot - (guint8*)vt;
 282                 if (displacement > 0) {
 283                         int slot = (displacement - G_STRUCT_OFFSET (MonoVTable, vtable)) / sizeof (gpointer);
 284                         g_assert (slot >= 0);
 285
 286                         /* Avoid loading metadata or creating a generic vtable if possible */
 287                         addr = mono_aot_get_method_from_vt_slot (mono_domain_get (), vt, slot);
 288                         if (addr)
 289                                 addr = mono_create_ftnptr (mono_domain_get (), addr);
 290                         if (addr && !vt->klass->valuetype) {
 291                                 vtable_slot = mono_get_vcall_slot_addr (code, regs);
 292                                 if (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot)) {
 293                                         *vtable_slot = mono_get_addr_from_ftnptr (addr);
 294                                 }
 295
 296                                 return addr;
 297                         }
 298
 299                         m = mono_class_get_vtable_entry (vt->klass, slot);
 300                         if (mono_method_needs_static_rgctx_invoke (m, FALSE))
 301                                 need_rgctx_tramp = TRUE;
 302
 303                         /*g_print ("%s with disp %d: %s at %p\n", vt->klass->name, displacement, m->name, code);*/
 304                 } else {
 305                         /* We got here from an interface method: redirect to IMT handling */
 306                         m = MONO_FAKE_IMT_METHOD;
 307                         /*g_print ("vtable with disp %d at %p\n", displacement, code);*/
 308                 }
 309         }
 310
 311         /* this is the IMT trampoline */
 312 #ifdef MONO_ARCH_HAVE_IMT
 313         if (m == MONO_FAKE_IMT_METHOD) {
 314                 MonoMethod *impl_method;
 315                 MonoObject *this_arg;
 316
 317                 /* we get the interface method because mono_convert_imt_slot_to_vtable_slot ()
 318                  * needs the signature to be able to find the this argument
 319                  */
 320                 m = mono_arch_find_imt_method (regs, code);
 321                 vtable_slot = orig_vtable_slot;
 322                 g_assert (vtable_slot);
 323
 324                 this_arg = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (m), regs, code);
 325
 326                 if (this_arg->vtable->klass == mono_defaults.transparent_proxy_class) {
 327                         /* Use the slow path for now */
 328                         proxy = TRUE;
 329                     m = mono_object_get_virtual_method (this_arg, m);
 330                 } else {
 331                         vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, &impl_method, &need_rgctx_tramp, &variance_used);
 332                         /* mono_convert_imt_slot_to_vtable_slot () also gives us the method that is supposed
 333                          * to be called, so we compile it and go ahead as usual.
 334                          */
 335                         /*g_print ("imt found method %p (%s) at %p\n", impl_method, impl_method->name, code);*/
 336                         if (m->is_inflated && ((MonoMethodInflated*)m)->context.method_inst) {
 337                                 /* Generic virtual method */
 338                                 generic_virtual = m;
 339                                 need_rgctx_tramp = TRUE;
 340                         } else if (variance_used && mono_class_has_variant_generic_params (m->klass)) {
 341                                 variant_iface = m;
 342                         }
 343                         m = impl_method;
 344                 }
 345         }
 346 #endif
 347
 348 #ifdef MONO_ARCH_LLVM_SUPPORTED
 349         if (!vtable_slot && code && !need_rgctx_tramp && mono_method_needs_static_rgctx_invoke (m, FALSE)) {
 350                 /*
 351                  * Call this only if the called method is shared, cause it is slow/loads a lot of
 352                  * data in AOT.
 353                  */
 354                 ji = mini_jit_info_table_find (mono_domain_get (), (char*)code, NULL);
 355                 if (ji && ji->from_llvm) {
 356                         /* LLVM can't pass an rgctx arg */
 357                         need_rgctx_tramp = TRUE;
 358                 }
 359         }
 360 #endif
 361
 362         if (m->is_generic) {
 363                 MonoGenericContext context = { NULL, NULL };
 364                 MonoMethod *declaring;
 365
 366                 if (m->is_inflated)
 367                         declaring = mono_method_get_declaring_generic_method (m);
 368                 else
 369                         declaring = m;
 370
 371                 if (m->klass->generic_class)
 372                         context.class_inst = m->klass->generic_class->context.class_inst;
 373                 else
 374                         g_assert (!m->klass->generic_container);
 375
 376 #ifdef MONO_ARCH_HAVE_IMT
 377                 generic_virtual = mono_arch_find_imt_method (regs, code);
 378 #endif
 379                 if (generic_virtual) {
 380                         g_assert (generic_virtual->is_inflated);
 381                         context.method_inst = ((MonoMethodInflated*)generic_virtual)->context.method_inst;
 382                 }
 383
 384                 m = mono_class_inflate_generic_method (declaring, &context);
 385                 /* FIXME: only do this if the method is sharable */
 386                 need_rgctx_tramp = TRUE;
 387         } else if ((context_used = mono_method_check_context_used (m))) {
 388                 MonoClass *klass = NULL;
 389                 MonoMethod *actual_method = NULL;
 390                 MonoVTable *vt = NULL;
 391                 MonoGenericInst *method_inst = NULL;
 392
 393                 vtable_slot = NULL;
 394                 generic_shared = TRUE;
 395
 396                 g_assert (code);
 397
 398                 if (m->is_inflated && mono_method_get_context (m)->method_inst) {
 399 #ifdef MONO_ARCH_RGCTX_REG
 400                         MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext*)mono_arch_find_static_call_vtable (regs, code);
 401
 402                         klass = mrgctx->class_vtable->klass;
 403                         method_inst = mrgctx->method_inst;
 404 #else
 405                         g_assert_not_reached ();
 406 #endif
 407                 } else if ((m->flags & METHOD_ATTRIBUTE_STATIC) || m->klass->valuetype) {
 408 #ifdef MONO_ARCH_RGCTX_REG
 409                         MonoVTable *vtable = mono_arch_find_static_call_vtable (regs, code);
 410
 411                         klass = vtable->klass;
 412 #else
 413                         g_assert_not_reached ();
 414 #endif
 415                 } else {
 416 #ifdef MONO_ARCH_HAVE_IMT
 417                         MonoObject *this_argument = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (m), regs, code);
 418
 419                         vt = this_argument->vtable;
 420                         vtable_slot = orig_vtable_slot;
 421
 422                         g_assert (this_argument->vtable->klass->inited);
 423                         //mono_class_init (this_argument->vtable->klass);
 424
 425                         if (!vtable_slot)
 426                                 klass = this_argument->vtable->klass->supertypes [m->klass->idepth - 1];
 427 #else
 428                         NOT_IMPLEMENTED;
 429 #endif
 430                 }
 431
 432                 g_assert (vtable_slot || klass);
 433
 434                 if (vtable_slot) {
 435                         int displacement = vtable_slot - ((gpointer*)vt);
 436
 437                         g_assert_not_reached ();
 438
 439                         g_assert (displacement > 0);
 440
 441                         actual_method = vt->klass->vtable [displacement];
 442                 }
 443
 444                 if (method_inst) {
 445                         MonoGenericContext context = { NULL, NULL };
 446
 447                         if (m->is_inflated)
 448                                 declaring = mono_method_get_declaring_generic_method (m);
 449                         else
 450                                 declaring = m;
 451
 452                         if (klass->generic_class)
 453                                 context.class_inst = klass->generic_class->context.class_inst;
 454                         else if (klass->generic_container)
 455                                 context.class_inst = klass->generic_container->context.class_inst;
 456                         context.method_inst = method_inst;
 457
 458                         actual_method = mono_class_inflate_generic_method (declaring, &context);
 459                 } else {
 460                         actual_method = mono_class_get_method_generic (klass, m);
 461                 }
 462
 463                 g_assert (klass);
 464                 g_assert (actual_method);
 465                 g_assert (actual_method->klass == klass);
 466
 467                 if (actual_method->is_inflated)
 468                         declaring = mono_method_get_declaring_generic_method (actual_method);
 469                 else
 470                         declaring = NULL;
 471
 472                 m = actual_method;
 473         }
 474
 475         if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
 476                 MonoJitInfo *ji;
 477
 478                 if (code)
 479                         ji = mini_jit_info_table_find (mono_domain_get (), (char*)code, NULL);
 480                 else
 481                         ji = NULL;
 482
 483                 /* Avoid recursion */
 484                 if (!(ji && ji->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED))
 485                         m = mono_marshal_get_synchronized_wrapper (m);
 486         }
 487
 488         /* Calls made through delegates on platforms without delegate trampolines */
 489         if (!code && mono_method_needs_static_rgctx_invoke (m, FALSE))
 490                 need_rgctx_tramp = TRUE;
 491
 492         addr = compiled_method = mono_compile_method (m);
 493         g_assert (addr);
 494
 495         mono_debugger_trampoline_compiled (code, m, addr);
 496
 497         if (need_rgctx_tramp)
 498                 addr = mono_create_static_rgctx_trampoline (m, addr);
 499
 500         if (generic_virtual || variant_iface) {
 501                 MonoMethod *target = generic_virtual ? generic_virtual : variant_iface;
 502
 503                 vtable_slot = orig_vtable_slot;
 504                 g_assert (vtable_slot);
 505
 506                 if (vt->klass->valuetype) /*FIXME is this required variant iface?*/
 507                         addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr, need_rgctx_tramp);
 508
 509                 mono_method_add_generic_virtual_invocation (mono_domain_get (),
 510                                                                                                         vt, vtable_slot,
 511                                                                                                         target, addr);
 512
 513                 return addr;
 514         }
 515
 516         /* the method was jumped to */
 517         if (!code) {
 518                 MonoDomain *domain = mono_domain_get ();
 519
 520                 /* Patch the got entries pointing to this method */
 521                 /*
 522                  * We do this here instead of in mono_codegen () to cover the case when m
 523                  * was loaded from an aot image.
 524                  */
 525                 if (domain_jit_info (domain)->jump_target_got_slot_hash) {
 526                         GSList *list, *tmp;
 527
 528                         mono_domain_lock (domain);
 529                         list = g_hash_table_lookup (domain_jit_info (domain)->jump_target_got_slot_hash, m);
 530                         if (list) {
 531                                 for (tmp = list; tmp; tmp = tmp->next) {
 532                                         gpointer *got_slot = tmp->data;
 533                                         *got_slot = addr;
 534                                 }
 535                                 g_hash_table_remove (domain_jit_info (domain)->jump_target_got_slot_hash, m);
 536                                 g_slist_free (list);
 537                         }
 538                         mono_domain_unlock (domain);
 539                 }
 540
 541                 return addr;
 542         }
 543
 544         vtable_slot = orig_vtable_slot;
 545
 546         if (vtable_slot) {
 547                 gboolean variance_used = FALSE;
 548                 if (m->klass->valuetype)
 549                         addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr, need_rgctx_tramp);
 550                 g_assert (*vtable_slot);
 551
 552                 if (!proxy && (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))) {
 553 #ifdef MONO_ARCH_HAVE_IMT
 554                         vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, NULL, &need_rgctx_tramp, &variance_used);
 555 #endif
 556                         *vtable_slot = mono_get_addr_from_ftnptr (addr);
 557                 }
 558         }
 559         else {
 560                 guint8 *plt_entry = mono_aot_get_plt_entry (code);
 561
 562                 if (plt_entry) {
 563                                 mono_aot_patch_plt_entry (plt_entry, NULL, regs, addr);
 564                 } else {
 565                         if (generic_shared) {
 566                                 if (m->wrapper_type != MONO_WRAPPER_NONE)
 567                                         m = mono_marshal_method_from_wrapper (m);
 568                                 g_assert (mono_method_is_generic_sharable_impl (m, FALSE));
 569                         }
 570
 571                         /* Patch calling code */
 572                         {
 573                                 MonoJitInfo *target_ji =
 574                                         mono_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (compiled_method));
 575
 576                                 if (!ji)
 577                                         ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
 578
 579                                 if (mono_method_same_domain (ji, target_ji))
 580                                         mono_arch_patch_callsite (ji->code_start, code, addr);
 581                         }
 582                 }
 583         }
 584
 585         return addr;
 586 }
 587
 588 /**
 589  * mono_magic_trampoline:
 590  *
 591  *   This trampoline handles calls from JITted code.
 592  */
 593 gpointer
 594 mono_magic_trampoline (mgreg_t *regs, guint8 *code, gpointer arg, guint8* tramp)
 595 {
 596         gpointer *vtable_slot;
 597         int displacement;
 598         MonoVTable *vt;
 599
 600         trampoline_calls ++;
 601
 602         if (code && !mono_use_llvm)
 603                 vt = mono_arch_get_vcall_slot (code, regs, &displacement);
 604         else
 605                 vt = NULL;
 606         if (vt)
 607                 vtable_slot = (gpointer*)((char*)vt + displacement);
 608         else
 609                 vtable_slot = NULL;
 610
 611         return common_call_trampoline (regs, code, arg, tramp, vt, vtable_slot, FALSE);
 612 }
 613
 614 #ifdef MONO_ARCH_LLVM_SUPPORTED
 615 /*
 616  * mono_llvm_vcall_trampoline:
 617  *
 618  *   This trampoline handles virtual calls when using LLVM.
 619  */
 620 static gpointer
 621 mono_llvm_vcall_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
 622 {
 623         MonoObject *this;
 624         MonoVTable *vt;
 625         gpointer *vtable_slot;
 626         int slot;
 627
 628         trampoline_calls ++;
 629
 630         /*
 631          * We have the method which is called, we need to obtain the vtable slot without
 632          * disassembly which is impossible with LLVM.
 633          * So we use the this argument.
 634          */
 635         this = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (m), regs, code);
 636         g_assert (this);
 637
 638         slot = mono_method_get_vtable_slot (m);
 639
 640         g_assert (slot != -1);
 641
 642         g_assert (this->vtable->klass->vtable [slot] == m);
 643
 644         vt = this->vtable;
 645
 646         g_assert (!m->is_generic);
 647
 648         vtable_slot = &(vt->vtable [slot]);
 649
 650         return common_call_trampoline (regs, code, m, tramp, vt, vtable_slot, mono_method_needs_static_rgctx_invoke (m, 0));
 651 }
 652 #endif
 653
 654 gpointer
 655 mono_generic_virtual_remoting_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
 656 {
 657         MonoGenericContext context = { NULL, NULL };
 658         MonoMethod *imt_method, *declaring;
 659         gpointer addr;
 660
 661         trampoline_calls ++;
 662
 663         g_assert (m->is_generic);
 664
 665         if (m->is_inflated)
 666                 declaring = mono_method_get_declaring_generic_method (m);
 667         else
 668                 declaring = m;
 669
 670         if (m->klass->generic_class)
 671                 context.class_inst = m->klass->generic_class->context.class_inst;
 672         else
 673                 g_assert (!m->klass->generic_container);
 674
 675 #ifdef MONO_ARCH_HAVE_IMT
 676         imt_method = mono_arch_find_imt_method (regs, code);
 677         if (imt_method->is_inflated)
 678                 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
 679 #endif
 680         m = mono_class_inflate_generic_method (declaring, &context);
 681         m = mono_marshal_get_remoting_invoke_with_check (m);
 682
 683         addr = mono_compile_method (m);
 684         g_assert (addr);
 685
 686         mono_debugger_trampoline_compiled (NULL, m, addr);
 687
 688         return addr;
 689 }
 690
 691 /*
 692  * mono_aot_trampoline:
 693  *
 694  *   This trampoline handles calls made from AOT code. We try to bypass the
 695  * normal JIT compilation logic to avoid loading the metadata for the method.
 696  */
 697 #ifdef MONO_ARCH_AOT_SUPPORTED
 698 gpointer
 699 mono_aot_trampoline (mgreg_t *regs, guint8 *code, guint8 *token_info,
 700                                          guint8* tramp)
 701 {
 702         MonoImage *image;
 703         guint32 token;
 704         MonoMethod *method = NULL;
 705         gpointer addr;
 706         gpointer *vtable_slot;
 707         guint8 *plt_entry;
 708
 709         trampoline_calls ++;
 710
 711         image = *(gpointer*)(gpointer)token_info;
 712         token_info += sizeof (gpointer);
 713         token = *(guint32*)(gpointer)token_info;
 714
 715         addr = mono_aot_get_method_from_token (mono_domain_get (), image, token);
 716         if (!addr) {
 717                 method = mono_get_method (image, token, NULL);
 718                 g_assert (method);
 719
 720                 /* Use the generic code */
 721                 return mono_magic_trampoline (regs, code, method, tramp);
 722         }
 723
 724         addr = mono_create_ftnptr (mono_domain_get (), addr);
 725
 726         vtable_slot = mono_get_vcall_slot_addr (code, regs);
 727         g_assert (!vtable_slot);
 728
 729         /* This is a normal call through a PLT entry */
 730         plt_entry = mono_aot_get_plt_entry (code);
 731         g_assert (plt_entry);
 732
 733         mono_aot_patch_plt_entry (plt_entry, NULL, regs, addr);
 734
 735         return addr;
 736 }
 737
 738 /*
 739  * mono_aot_plt_trampoline:
 740  *
 741  *   This trampoline handles calls made from AOT code through the PLT table.
 742  */
 743 gpointer
 744 mono_aot_plt_trampoline (mgreg_t *regs, guint8 *code, guint8 *aot_module,
 745                                                  guint8* tramp)
 746 {
 747         guint32 plt_info_offset = mono_aot_get_plt_info_offset (regs, code);
 748         gpointer res;
 749
 750         trampoline_calls ++;
 751
 752         res = mono_aot_plt_resolve (aot_module, plt_info_offset, code);
 753         if (!res) {
 754                 if (mono_loader_get_last_error ())
 755                         mono_raise_exception (mono_loader_error_prepare_exception (mono_loader_get_last_error ()));
 756                 // FIXME: Error handling (how ?)
 757                 g_assert (res);
 758         }
 759
 760         return res;
 761 }
 762 #endif
 763
 764 /**
 765  * mono_class_init_trampoline:
 766  *
 767  * This method calls mono_runtime_class_init () to run the static constructor
 768  * for the type, then patches the caller code so it is not called again.
 769  */
 770 void
 771 mono_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
 772 {
 773         guint8 *plt_entry = mono_aot_get_plt_entry (code);
 774
 775         trampoline_calls ++;
 776
 777         mono_runtime_class_init (vtable);
 778
 779         if (plt_entry) {
 780                 mono_arch_nullify_plt_entry (plt_entry, regs);
 781         } else {
 782                 mono_arch_nullify_class_init_trampoline (code, regs);
 783         }
 784 }
 785
 786 /**
 787  * mono_generic_class_init_trampoline:
 788  *
 789  * This method calls mono_runtime_class_init () to run the static constructor
 790  * for the type.
 791  */
 792 void
 793 mono_generic_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
 794 {
 795         trampoline_calls ++;
 796
 797         mono_runtime_class_init (vtable);
 798 }
 799
 800 static gpointer
 801 mono_rgctx_lazy_fetch_trampoline (mgreg_t *regs, guint8 *code, gpointer data, guint8 *tramp)
 802 {
 803 #ifdef MONO_ARCH_VTABLE_REG
 804         static gboolean inited = FALSE;
 805         static int num_lookups = 0;
 806         guint32 slot = GPOINTER_TO_UINT (data);
 807         mgreg_t *r = (mgreg_t*)regs;
 808         gpointer arg = (gpointer)(gssize)r [MONO_ARCH_VTABLE_REG];
 809         guint32 index = MONO_RGCTX_SLOT_INDEX (slot);
 810         gboolean mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
 811
 812         trampoline_calls ++;
 813
 814         if (!inited) {
 815                 mono_counters_register ("RGCTX unmanaged lookups", MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_lookups);
 816                 inited = TRUE;
 817         }
 818
 819         num_lookups++;
 820
 821         if (mrgctx)
 822                 return mono_method_fill_runtime_generic_context (arg, index);
 823         else
 824                 return mono_class_fill_runtime_generic_context (arg, index);
 825 #else
 826         g_assert_not_reached ();
 827 #endif
 828 }
 829
 830 void
 831 mono_monitor_enter_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
 832 {
 833         mono_monitor_enter (obj);
 834 }
 835
 836 void
 837 mono_monitor_exit_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
 838 {
 839         mono_monitor_exit (obj);
 840 }
 841
 842 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
 843
 844 /**
 845  * mono_delegate_trampoline:
 846  *
 847  *   This trampoline handles calls made to Delegate:Invoke ().
 848  * This is called once the first time a delegate is invoked, so it must be fast.
 849  */
 850 gpointer
 851 mono_delegate_trampoline (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
 852 {
 853         MonoDomain *domain = mono_domain_get ();
 854         MonoDelegate *delegate;
 855         MonoJitInfo *ji;
 856         MonoMethod *m;
 857         MonoMethod *method = NULL;
 858         gboolean multicast, callvirt;
 859         gboolean need_rgctx_tramp = FALSE;
 860         MonoMethod *invoke = tramp_data [0];
 861         guint8 *impl_this = tramp_data [1];
 862         guint8 *impl_nothis = tramp_data [2];
 863         MonoError err;
 864         MonoMethodSignature *sig;
 865
 866         trampoline_calls ++;
 867
 868         /* Obtain the delegate object according to the calling convention */
 869
 870         /*
 871          * Avoid calling mono_get_generic_context_from_code () now since it is expensive,
 872          * get_this_arg_from_call will call it if needed.
 873          */
 874         delegate = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (invoke), regs, code);
 875
 876         if (delegate->method) {
 877                 method = delegate->method;
 878
 879                 /*
 880                  * delegate->method_ptr == NULL means the delegate was initialized by
 881                  * mini_delegate_ctor, while != NULL means it is initialized by
 882                  * mono_delegate_ctor_with_method (). In both cases, we need to add wrappers
 883                  * (ctor_with_method () does this, but it doesn't store the wrapper back into
 884                  * delegate->method).
 885                  */
 886                 if (delegate->target && delegate->target->vtable->klass == mono_defaults.transparent_proxy_class) {
 887 #ifndef DISABLE_COM
 888                         if (((MonoTransparentProxy *)delegate->target)->remote_class->proxy_class != mono_defaults.com_object_class &&
 889                            !((MonoTransparentProxy *)delegate->target)->remote_class->proxy_class->is_com_object)
 890 #endif
 891                                 method = mono_marshal_get_remoting_invoke (method);
 892                 }
 893                 else {
 894                         mono_error_init (&err);
 895                         sig = mono_method_signature_checked (method, &err);
 896                         if (!sig)
 897                                 mono_error_raise_exception (&err);
 898
 899                         if (sig->hasthis && method->klass->valuetype)
 900                                 method = mono_marshal_get_unbox_wrapper (method);
 901                 }
 902         } else {
 903                 ji = mono_jit_info_table_find (domain, mono_get_addr_from_ftnptr (delegate->method_ptr));
 904                 if (ji)
 905                         method = ji->method;
 906         }
 907
 908         if (method) {
 909                 mono_error_init (&err);
 910                 sig = mono_method_signature_checked (method, &err);
 911                 if (!sig)
 912                         mono_error_raise_exception (&err);
 913
 914                 callvirt = !delegate->target && sig->hasthis;
 915         }
 916
 917         if (method && method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
 918                 method = mono_marshal_get_synchronized_wrapper (method);
 919
 920         if (method && mono_method_needs_static_rgctx_invoke (method, FALSE))
 921                 need_rgctx_tramp = TRUE;
 922
 923         /*
 924          * If the called address is a trampoline, replace it with the compiled method so
 925          * further calls don't have to go through the trampoline.
 926          */
 927         if (method && !callvirt) {
 928                 /* Avoid the overhead of looking up an already compiled method if possible */
 929                 if (delegate->method_code && *delegate->method_code) {
 930                         delegate->method_ptr = *delegate->method_code;
 931                 } else {
 932                         delegate->method_ptr = mono_compile_method (method);
 933                         if (need_rgctx_tramp)
 934                                 delegate->method_ptr = mono_create_static_rgctx_trampoline (method, delegate->method_ptr);
 935                         if (delegate->method_code)
 936                                 *delegate->method_code = delegate->method_ptr;
 937                         mono_debugger_trampoline_compiled (NULL, method, delegate->method_ptr);
 938                 }
 939         } else {
 940                 if (need_rgctx_tramp)
 941                         delegate->method_ptr = mono_create_static_rgctx_trampoline (method, delegate->method_ptr);
 942         }
 943
 944         multicast = ((MonoMulticastDelegate*)delegate)->prev != NULL;
 945         if (!multicast && !callvirt) {
 946                 if (method && (method->flags & METHOD_ATTRIBUTE_STATIC) && mono_method_signature (method)->param_count == mono_method_signature (invoke)->param_count + 1)
 947                         /* Closed static delegate */
 948                         code = impl_this;
 949                 else
 950                         code = delegate->target ? impl_this : impl_nothis;
 951
 952                 if (code) {
 953                         delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
 954                         return code;
 955                 }
 956         }
 957
 958         /* The general, unoptimized case */
 959         m = mono_marshal_get_delegate_invoke (invoke, delegate);
 960         code = mono_compile_method (m);
 961         delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
 962         mono_debugger_trampoline_compiled (NULL, m, delegate->invoke_impl);
 963
 964         return code;
 965 }
 966
 967 #endif
 968
 969 /*
 970  * mono_get_trampoline_func:
 971  *
 972  *   Return the C function which needs to be called by the generic trampoline of type
 973  * TRAMP_TYPE.
 974  */
 975 gconstpointer
 976 mono_get_trampoline_func (MonoTrampolineType tramp_type)
 977 {
 978         switch (tramp_type) {
 979         case MONO_TRAMPOLINE_JIT:
 980         case MONO_TRAMPOLINE_JUMP:
 981                 return mono_magic_trampoline;
 982         case MONO_TRAMPOLINE_CLASS_INIT:
 983                 return mono_class_init_trampoline;
 984         case MONO_TRAMPOLINE_GENERIC_CLASS_INIT:
 985                 return mono_generic_class_init_trampoline;
 986         case MONO_TRAMPOLINE_RGCTX_LAZY_FETCH:
 987                 return mono_rgctx_lazy_fetch_trampoline;
 988 #ifdef MONO_ARCH_AOT_SUPPORTED
 989         case MONO_TRAMPOLINE_AOT:
 990                 return mono_aot_trampoline;
 991         case MONO_TRAMPOLINE_AOT_PLT:
 992                 return mono_aot_plt_trampoline;
 993 #endif
 994 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
 995         case MONO_TRAMPOLINE_DELEGATE:
 996                 return mono_delegate_trampoline;
 997 #endif
 998         case MONO_TRAMPOLINE_RESTORE_STACK_PROT:
 999                 return mono_altstack_restore_prot;
1000         case MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING:
1001                 return mono_generic_virtual_remoting_trampoline;
1002         case MONO_TRAMPOLINE_MONITOR_ENTER:
1003                 return mono_monitor_enter_trampoline;
1004         case MONO_TRAMPOLINE_MONITOR_EXIT:
1005                 return mono_monitor_exit_trampoline;
1006 #ifdef MONO_ARCH_LLVM_SUPPORTED
1007         case MONO_TRAMPOLINE_LLVM_VCALL:
1008                 return mono_llvm_vcall_trampoline;
1009 #endif
1010         default:
1011                 g_assert_not_reached ();
1012                 return NULL;
1013         }
1014 }
1015
1016 void
1017 mono_trampolines_init (void)
1018 {
1019         InitializeCriticalSection (&trampolines_mutex);
1020
1021         if (mono_aot_only)
1022                 return;
1023
1024         mono_trampoline_code [MONO_TRAMPOLINE_JIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JIT);
1025         mono_trampoline_code [MONO_TRAMPOLINE_JUMP] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JUMP);
1026         mono_trampoline_code [MONO_TRAMPOLINE_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
1027         mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
1028         mono_trampoline_code [MONO_TRAMPOLINE_RGCTX_LAZY_FETCH] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RGCTX_LAZY_FETCH);
1029 #ifdef MONO_ARCH_AOT_SUPPORTED
1030         mono_trampoline_code [MONO_TRAMPOLINE_AOT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT);
1031         mono_trampoline_code [MONO_TRAMPOLINE_AOT_PLT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT_PLT);
1032 #endif
1033 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1034         mono_trampoline_code [MONO_TRAMPOLINE_DELEGATE] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_DELEGATE);
1035 #endif
1036         mono_trampoline_code [MONO_TRAMPOLINE_RESTORE_STACK_PROT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RESTORE_STACK_PROT);
1037         mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING);
1038         mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_ENTER] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
1039         mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_EXIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
1040 #ifdef MONO_ARCH_LLVM_SUPPORTED
1041         mono_trampoline_code [MONO_TRAMPOLINE_LLVM_VCALL] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_LLVM_VCALL);
1042 #endif
1043
1044         mono_counters_register ("Calls to trampolines", MONO_COUNTER_JIT | MONO_COUNTER_INT, &trampoline_calls);
1045 }
1046
1047 void
1048 mono_trampolines_cleanup (void)
1049 {
1050         if (class_init_hash_addr)
1051                 g_hash_table_destroy (class_init_hash_addr);
1052
1053         DeleteCriticalSection (&trampolines_mutex);
1054 }
1055
1056 guint8 *
1057 mono_get_trampoline_code (MonoTrampolineType tramp_type)
1058 {
1059         g_assert (mono_trampoline_code [tramp_type]);
1060
1061         return mono_trampoline_code [tramp_type];
1062 }
1063
1064 gpointer
1065 mono_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
1066 {
1067         if (mono_aot_only)
1068                 return mono_aot_create_specific_trampoline (mono_defaults.corlib, arg1, tramp_type, domain, code_len);
1069         else
1070                 return mono_arch_create_specific_trampoline (arg1, tramp_type, domain, code_len);
1071 }
1072
1073 gpointer
1074 mono_create_class_init_trampoline (MonoVTable *vtable)
1075 {
1076         gpointer code, ptr;
1077         MonoDomain *domain = vtable->domain;
1078
1079         g_assert (!vtable->klass->generic_container);
1080
1081         /* previously created trampoline code */
1082         mono_domain_lock (domain);
1083         ptr =
1084                 g_hash_table_lookup (domain_jit_info (domain)->class_init_trampoline_hash,
1085                                                                   vtable);
1086         mono_domain_unlock (domain);
1087         if (ptr)
1088                 return ptr;
1089
1090         code = mono_create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, domain, NULL);
1091
1092         ptr = mono_create_ftnptr (domain, code);
1093
1094         /* store trampoline address */
1095         mono_domain_lock (domain);
1096         g_hash_table_insert (domain_jit_info (domain)->class_init_trampoline_hash,
1097                                                           vtable, ptr);
1098         mono_domain_unlock (domain);
1099
1100         mono_trampolines_lock ();
1101         if (!class_init_hash_addr)
1102                 class_init_hash_addr = g_hash_table_new (NULL, NULL);
1103         g_hash_table_insert (class_init_hash_addr, ptr, vtable);
1104         mono_trampolines_unlock ();
1105
1106         return ptr;
1107 }
1108
1109 gpointer
1110 mono_create_generic_class_init_trampoline (void)
1111 {
1112 #ifdef MONO_ARCH_VTABLE_REG
1113         static gpointer code;
1114
1115         mono_trampolines_lock ();
1116
1117         if (!code) {
1118                 if (mono_aot_only)
1119                         /* get_named_code () might return an ftnptr, but our caller expects a direct pointer */
1120                         code = mono_get_addr_from_ftnptr (mono_aot_get_named_code ("generic_class_init_trampoline"));
1121                 else
1122                         code = mono_arch_create_generic_class_init_trampoline ();
1123         }
1124
1125         mono_trampolines_unlock ();
1126
1127         return code;
1128 #else
1129         g_assert_not_reached ();
1130 #endif
1131 }
1132
1133 gpointer
1134 mono_create_jump_trampoline (MonoDomain *domain, MonoMethod *method, gboolean add_sync_wrapper)
1135 {
1136         MonoJitInfo *ji;
1137         gpointer code;
1138         guint32 code_size = 0;
1139
1140         code = mono_jit_find_compiled_method_with_jit_info (domain, method, &ji);
1141         /*
1142          * We cannot recover the correct type of a shared generic
1143          * method from its native code address, so we use the
1144          * trampoline instead.
1145          */
1146         if (code && !ji->has_generic_jit_info)
1147                 return code;
1148
1149         mono_domain_lock (domain);
1150         code = g_hash_table_lookup (domain_jit_info (domain)->jump_trampoline_hash, method);
1151         mono_domain_unlock (domain);
1152         if (code)
1153                 return code;
1154
1155         code = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get (), &code_size);
1156         g_assert (code_size);
1157
1158         ji = mono_domain_alloc0 (domain, MONO_SIZEOF_JIT_INFO);
1159         ji->code_start = code;
1160         ji->code_size = code_size;
1161         ji->method = method;
1162
1163         /*
1164          * mono_delegate_ctor needs to find the method metadata from the
1165          * trampoline address, so we save it here.
1166          */
1167
1168         mono_jit_info_table_add (domain, ji);
1169
1170         mono_domain_lock (domain);
1171         g_hash_table_insert (domain_jit_info (domain)->jump_trampoline_hash, method, ji->code_start);
1172         mono_domain_unlock (domain);
1173
1174         return ji->code_start;
1175 }
1176
1177 gpointer
1178 mono_create_jit_trampoline_in_domain (MonoDomain *domain, MonoMethod *method)
1179 {
1180         gpointer tramp;
1181
1182         if (mono_aot_only) {
1183                 /* Avoid creating trampolines if possible */
1184                 gpointer code = mono_jit_find_compiled_method (domain, method);
1185
1186                 if (code)
1187                         return code;
1188         }
1189
1190         mono_domain_lock (domain);
1191         tramp = g_hash_table_lookup (domain_jit_info (domain)->jit_trampoline_hash, method);
1192         mono_domain_unlock (domain);
1193         if (tramp)
1194                 return tramp;
1195
1196         tramp = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JIT, domain, NULL);
1197
1198         mono_domain_lock (domain);
1199         g_hash_table_insert (domain_jit_info (domain)->jit_trampoline_hash, method, tramp);
1200         mono_domain_unlock (domain);
1201
1202         mono_jit_stats.method_trampolines++;
1203
1204         return tramp;
1205 }
1206
1207 gpointer
1208 mono_create_jit_trampoline (MonoMethod *method)
1209 {
1210         return mono_create_jit_trampoline_in_domain (mono_domain_get (), method);
1211 }
1212
1213 gpointer
1214 mono_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
1215 {
1216         gpointer tramp;
1217
1218         MonoDomain *domain = mono_domain_get ();
1219         guint8 *buf, *start;
1220
1221         buf = start = mono_domain_code_reserve (domain, 2 * sizeof (gpointer));
1222
1223         *(gpointer*)(gpointer)buf = image;
1224         buf += sizeof (gpointer);
1225         *(guint32*)(gpointer)buf = token;
1226
1227         tramp = mono_create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain, NULL);
1228
1229         mono_jit_stats.method_trampolines++;
1230
1231         return tramp;
1232 }
1233
1234 gpointer
1235 mono_create_delegate_trampoline (MonoClass *klass)
1236 {
1237 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1238         MonoDomain *domain = mono_domain_get ();
1239         gpointer ptr;
1240         guint32 code_size = 0;
1241         gpointer *tramp_data;
1242         MonoMethod *invoke;
1243
1244         mono_domain_lock (domain);
1245         ptr = g_hash_table_lookup (domain_jit_info (domain)->delegate_trampoline_hash, klass);
1246         mono_domain_unlock (domain);
1247         if (ptr)
1248                 return ptr;
1249
1250         // Precompute the delegate invoke impl and pass it to the delegate trampoline
1251         invoke = mono_get_delegate_invoke (klass);
1252         g_assert (invoke);
1253
1254         tramp_data = mono_domain_alloc (domain, sizeof (gpointer) * 3);
1255         tramp_data [0] = invoke;
1256         tramp_data [1] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), TRUE);
1257         tramp_data [2] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), FALSE);
1258
1259         ptr = mono_create_specific_trampoline (tramp_data, MONO_TRAMPOLINE_DELEGATE, mono_domain_get (), &code_size);
1260         g_assert (code_size);
1261
1262         /* store trampoline address */
1263         mono_domain_lock (domain);
1264         g_hash_table_insert (domain_jit_info (domain)->delegate_trampoline_hash,
1265                                                           klass, ptr);
1266         mono_domain_unlock (domain);
1267
1268         return ptr;
1269 #else
1270         return NULL;
1271 #endif
1272 }
1273
1274 gpointer
1275 mono_create_rgctx_lazy_fetch_trampoline (guint32 offset)
1276 {
1277         static gboolean inited = FALSE;
1278         static int num_trampolines = 0;
1279
1280         gpointer tramp, ptr;
1281
1282         if (mono_aot_only)
1283                 return mono_aot_get_lazy_fetch_trampoline (offset);
1284
1285         mono_trampolines_lock ();
1286         if (rgctx_lazy_fetch_trampoline_hash)
1287                 tramp = g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset));
1288         else
1289                 tramp = NULL;
1290         mono_trampolines_unlock ();
1291         if (tramp)
1292                 return tramp;
1293
1294         tramp = mono_arch_create_rgctx_lazy_fetch_trampoline (offset);
1295         ptr = mono_create_ftnptr (mono_get_root_domain (), tramp);
1296
1297         mono_trampolines_lock ();
1298         if (!rgctx_lazy_fetch_trampoline_hash) {
1299                 rgctx_lazy_fetch_trampoline_hash = g_hash_table_new (NULL, NULL);
1300                 rgctx_lazy_fetch_trampoline_hash_addr = g_hash_table_new (NULL, NULL);
1301         }
1302         g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset), ptr);
1303         g_assert (offset != -1);
1304         g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash_addr, ptr, GUINT_TO_POINTER (offset + 1));
1305         mono_trampolines_unlock ();
1306
1307         if (!inited) {
1308                 mono_counters_register ("RGCTX num lazy fetch trampolines",
1309                                 MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_trampolines);
1310                 inited = TRUE;
1311         }
1312         num_trampolines++;
1313
1314         return ptr;
1315 }
1316
1317 gpointer
1318 mono_create_monitor_enter_trampoline (void)
1319 {
1320         static gpointer code;
1321
1322         if (mono_aot_only) {
1323                 if (!code)
1324                         code = mono_aot_get_named_code ("monitor_enter_trampoline");
1325                 return code;
1326         }
1327
1328 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1329         mono_trampolines_lock ();
1330
1331         if (!code)
1332                 code = mono_arch_create_monitor_enter_trampoline ();
1333
1334         mono_trampolines_unlock ();
1335 #else
1336         code = NULL;
1337         g_assert_not_reached ();
1338 #endif
1339
1340         return code;
1341 }
1342
1343 gpointer
1344 mono_create_monitor_exit_trampoline (void)
1345 {
1346         static gpointer code;
1347
1348         if (mono_aot_only) {
1349                 if (!code)
1350                         code = mono_aot_get_named_code ("monitor_exit_trampoline");
1351                 return code;
1352         }
1353
1354 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1355         mono_trampolines_lock ();
1356
1357         if (!code)
1358                 code = mono_arch_create_monitor_exit_trampoline ();
1359
1360         mono_trampolines_unlock ();
1361 #else
1362         code = NULL;
1363         g_assert_not_reached ();
1364 #endif
1365         return code;
1366 }
1367
1368 #ifdef MONO_ARCH_LLVM_SUPPORTED
1369 /*
1370  * mono_create_llvm_vcall_trampoline:
1371  *
1372  *  LLVM emits code for virtual calls which mono_get_vcall_slot is unable to
1373  * decode, i.e. only the final branch address is available:
1374  * mov <offset>(%rax), %rax
1375  * <random code inserted by instruction scheduling>
1376  * call *%rax
1377  *
1378  * To work around this problem, we don't use the common vtable trampoline when
1379  * llvm is enabled. Instead, we use one trampoline per method.
1380  */
1381 gpointer
1382 mono_create_llvm_vcall_trampoline (MonoMethod *method)
1383 {
1384         MonoDomain *domain;
1385         gpointer res;
1386
1387         domain = mono_domain_get ();
1388
1389         mono_domain_lock (domain);
1390         res = g_hash_table_lookup (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method);
1391         mono_domain_unlock (domain);
1392         if (res)
1393                 return res;
1394
1395         res = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_LLVM_VCALL, domain, NULL);
1396
1397         mono_domain_lock (domain);
1398         g_hash_table_insert (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method, res);
1399         mono_domain_unlock (domain);
1400
1401         return res;
1402 }
1403
1404 /*
1405  * mono_create_llvm_imt_trampoline:
1406  *
1407  *   LLVM compiled code can't pass in the IMT argument, so we use this trampoline, which
1408  * sets the IMT argument, then branches to the contents of the vtable slot given by
1409  * vt_offset in the vtable which is obtained from the argument list.
1410  */
1411 gpointer
1412 mono_create_llvm_imt_trampoline (MonoDomain *domain, MonoMethod *m, int vt_offset)
1413 {
1414 #ifdef MONO_ARCH_HAVE_LLVM_IMT_TRAMPOLINE
1415         return mono_arch_get_llvm_imt_trampoline (domain, m, vt_offset);
1416 #else
1417         g_assert_not_reached ();
1418         return NULL;
1419 #endif
1420 }
1421 #endif
1422
1423 MonoVTable*
1424 mono_find_class_init_trampoline_by_addr (gconstpointer addr)
1425 {
1426         MonoVTable *res;
1427
1428         mono_trampolines_lock ();
1429         if (class_init_hash_addr)
1430                 res = g_hash_table_lookup (class_init_hash_addr, addr);
1431         else
1432                 res = NULL;
1433         mono_trampolines_unlock ();
1434         return res;
1435 }
1436
1437 guint32
1438 mono_find_rgctx_lazy_fetch_trampoline_by_addr (gconstpointer addr)
1439 {
1440         int offset;
1441
1442         mono_trampolines_lock ();
1443         if (rgctx_lazy_fetch_trampoline_hash_addr) {
1444                 /* We store the real offset + 1 so we can detect when the lookup fails */
1445                 offset = GPOINTER_TO_INT (g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash_addr, addr));
1446                 if (offset)
1447                         offset -= 1;
1448                 else
1449                         offset = -1;
1450         } else {
1451                 offset = -1;
1452         }
1453         mono_trampolines_unlock ();
1454         return offset;
1455 }