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>
11 #ifdef HAVE_VALGRIND_MEMCHECK_H
12 #include <valgrind/memcheck.h>
16 #include "debug-mini.h"
19 * Address of the trampoline code. This is used by the debugger to check
20 * whether a method is a trampoline.
22 guint8* mono_trampoline_code [MONO_TRAMPOLINE_NUM];
24 static GHashTable *class_init_hash_addr = NULL;
25 static GHashTable *rgctx_lazy_fetch_trampoline_hash = NULL;
26 static GHashTable *rgctx_lazy_fetch_trampoline_hash_addr = NULL;
28 #define mono_trampolines_lock() EnterCriticalSection (&trampolines_mutex)
29 #define mono_trampolines_unlock() LeaveCriticalSection (&trampolines_mutex)
30 static CRITICAL_SECTION trampolines_mutex;
33 get_unbox_trampoline (MonoGenericSharingContext *gsctx, MonoMethod *m, gpointer addr, gboolean need_rgctx_tramp)
38 * The unbox trampolines call the method directly, so need to add
39 * an rgctx tramp before them.
41 return mono_create_static_rgctx_trampoline (m, mono_aot_get_unbox_trampoline (m));
43 return mono_aot_get_unbox_trampoline (m);
45 return mono_arch_get_unbox_trampoline (gsctx, m, addr);
49 #ifdef MONO_ARCH_HAVE_STATIC_RGCTX_TRAMPOLINE
51 * mono_create_static_rgctx_trampoline:
53 * Return a static rgctx trampoline for M which branches to ADDR which should
54 * point to the compiled code of M.
56 * Static rgctx trampolines are used when a shared generic method which doesn't
57 * have a this argument is called indirectly, ie. from code which can't pass in
58 * the rgctx argument. The trampoline sets the rgctx argument and jumps to the
59 * methods code. These trampolines are similar to the unbox trampolines, they
60 * perform the same task as the static rgctx wrappers, but they are smaller/faster,
61 * and can be made to work with full AOT.
64 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
70 if (mini_method_get_context (m)->method_inst)
71 ctx = mono_method_lookup_rgctx (mono_class_vtable (mono_domain_get (), m->klass), mini_method_get_context (m)->method_inst);
73 ctx = mono_class_vtable (mono_domain_get (), m->klass);
76 return mono_aot_get_static_rgctx_trampoline (ctx, addr);
78 domain = mono_domain_get ();
80 mono_domain_lock (domain);
81 res = g_hash_table_lookup (domain_jit_info (domain)->static_rgctx_trampoline_hash,
83 mono_domain_unlock (domain);
87 res = mono_arch_get_static_rgctx_trampoline (m, ctx, addr);
89 mono_domain_lock (domain);
90 /* Duplicates inserted while we didn't hold the lock are OK */
91 g_hash_table_insert (domain_jit_info (domain)->static_rgctx_trampoline_hash, m, res);
92 mono_domain_unlock (domain);
98 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
101 * This shouldn't happen as all arches which support generic sharing support
102 * static rgctx trampolines as well.
104 g_assert_not_reached ();
109 mono_get_vcall_slot_addr (guint8* code, mgreg_t *regs)
113 vt = mono_arch_get_vcall_slot (code, regs, &displacement);
116 return (gpointer*)((char*)vt + displacement);
119 #ifdef MONO_ARCH_HAVE_IMT
122 mono_convert_imt_slot_to_vtable_slot (gpointer* slot, mgreg_t *regs, guint8 *code, MonoMethod *method, MonoMethod **impl_method, gboolean *need_rgctx_tramp)
124 MonoGenericSharingContext *gsctx = mono_get_generic_context_from_code (code);
125 MonoObject *this_argument = mono_arch_find_this_argument (regs, method, gsctx);
126 MonoVTable *vt = this_argument->vtable;
127 int displacement = slot - ((gpointer*)vt);
129 if (displacement > 0) {
130 /* slot is in the vtable, not in the IMT */
132 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p is in the vtable, not in the IMT\n", slot);
136 MonoMethod *imt_method = mono_arch_find_imt_method (regs, code);
137 int interface_offset;
138 int imt_slot = MONO_IMT_SIZE + displacement;
140 interface_offset = mono_class_interface_offset (vt->klass, imt_method->klass);
142 if (interface_offset < 0) {
143 g_print ("%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));
144 g_assert_not_reached ();
146 mono_vtable_build_imt_slot (vt, mono_method_get_imt_slot (imt_method));
151 if (imt_method->is_inflated && ((MonoMethodInflated*)imt_method)->context.method_inst) {
152 MonoGenericContext context = { NULL, NULL };
155 * Generic virtual method, imt_method contains the inflated interface
156 * method, need to get the inflated impl method.
158 /* imt_method->slot might not be set */
159 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_declaring_generic_method (imt_method)->slot);
161 if (impl->klass->generic_class)
162 context.class_inst = impl->klass->generic_class->context.class_inst;
163 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
164 impl = mono_class_inflate_generic_method (impl, &context);
166 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + imt_method->slot);
169 if (mono_method_needs_static_rgctx_invoke (impl, FALSE))
170 *need_rgctx_tramp = TRUE;
174 printf ("mono_convert_imt_slot_to_vtable_slot: method = %s.%s.%s, imt_method = %s.%s.%s\n",
175 method->klass->name_space, method->klass->name, method->name,
176 imt_method->klass->name_space, imt_method->klass->name, imt_method->name);
179 g_assert (imt_slot < MONO_IMT_SIZE);
180 if (vt->imt_collisions_bitmap & (1 << imt_slot)) {
181 int vtable_offset = interface_offset + mono_method_get_vtable_index (imt_method);
182 gpointer *vtable_slot = & (vt->vtable [vtable_offset]);
184 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);
189 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p[%d] is in the IMT, but not colliding\n", slot, imt_slot);
198 * mono_magic_trampoline:
200 * This trampoline handles calls from JITted code.
203 mono_magic_trampoline (mgreg_t *regs, guint8 *code, gpointer arg, guint8* tramp)
206 gpointer *vtable_slot;
207 gboolean generic_shared = FALSE;
209 MonoMethod *declaring = NULL;
210 MonoMethod *generic_virtual = NULL;
212 gboolean proxy = FALSE;
213 gboolean need_rgctx_tramp = FALSE;
217 if (m == MONO_FAKE_VTABLE_METHOD) {
219 MonoVTable *vt = mono_arch_get_vcall_slot (code, regs, &displacement);
224 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
226 printf ("Caller: %s\n", mono_method_full_name (ji->method, TRUE));
227 /* Print some debug info */
228 for (i = 0; i < 32; ++i)
229 printf ("0x%x ", code [-32 + i]);
233 if (displacement > 0) {
234 displacement -= G_STRUCT_OFFSET (MonoVTable, vtable);
235 g_assert (displacement >= 0);
236 displacement /= sizeof (gpointer);
238 /* Avoid loading metadata or creating a generic vtable if possible */
239 addr = mono_aot_get_method_from_vt_slot (mono_domain_get (), vt, displacement);
241 addr = mono_create_ftnptr (mono_domain_get (), addr);
242 if (addr && !vt->klass->valuetype) {
243 vtable_slot = mono_get_vcall_slot_addr (code, regs);
244 if (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot)) {
245 *vtable_slot = mono_get_addr_from_ftnptr (addr);
251 m = mono_class_get_vtable_entry (vt->klass, displacement);
252 if (mono_method_needs_static_rgctx_invoke (m, FALSE))
253 need_rgctx_tramp = TRUE;
255 /*g_print ("%s with disp %d: %s at %p\n", vt->klass->name, displacement, m->name, code);*/
257 /* We got here from an interface method: redirect to IMT handling */
258 m = MONO_FAKE_IMT_METHOD;
259 /*g_print ("vtable with disp %d at %p\n", displacement, code);*/
263 /* this is the IMT trampoline */
264 #ifdef MONO_ARCH_HAVE_IMT
265 if (m == MONO_FAKE_IMT_METHOD) {
266 MonoMethod *impl_method;
267 MonoGenericSharingContext *gsctx;
268 MonoObject *this_arg;
270 /* we get the interface method because mono_convert_imt_slot_to_vtable_slot ()
271 * needs the signature to be able to find the this argument
273 m = mono_arch_find_imt_method (regs, code);
274 vtable_slot = mono_get_vcall_slot_addr (code, regs);
275 g_assert (vtable_slot);
277 gsctx = mono_get_generic_context_from_code (code);
278 this_arg = mono_arch_find_this_argument (regs, m, gsctx);
280 if (this_arg->vtable->klass == mono_defaults.transparent_proxy_class) {
281 /* Use the slow path for now */
283 m = mono_object_get_virtual_method (this_arg, m);
285 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, &impl_method, &need_rgctx_tramp);
286 /* mono_convert_imt_slot_to_vtable_slot () also gives us the method that is supposed
287 * to be called, so we compile it and go ahead as usual.
289 /*g_print ("imt found method %p (%s) at %p\n", impl_method, impl_method->name, code);*/
290 if (m->is_inflated && ((MonoMethodInflated*)m)->context.method_inst) {
291 /* Generic virtual method */
294 need_rgctx_tramp = TRUE;
303 MonoGenericContext context = { NULL, NULL };
304 MonoMethod *declaring;
307 declaring = mono_method_get_declaring_generic_method (m);
311 if (m->klass->generic_class)
312 context.class_inst = m->klass->generic_class->context.class_inst;
314 g_assert (!m->klass->generic_container);
316 #ifdef MONO_ARCH_HAVE_IMT
317 generic_virtual = mono_arch_find_imt_method (regs, code);
319 if (generic_virtual) {
320 g_assert (generic_virtual->is_inflated);
321 context.method_inst = ((MonoMethodInflated*)generic_virtual)->context.method_inst;
324 m = mono_class_inflate_generic_method (declaring, &context);
325 /* FIXME: only do this if the method is sharable */
326 need_rgctx_tramp = TRUE;
327 } else if ((context_used = mono_method_check_context_used (m))) {
328 MonoClass *klass = NULL;
329 MonoMethod *actual_method = NULL;
330 MonoVTable *vt = NULL;
331 MonoGenericInst *method_inst = NULL;
334 generic_shared = TRUE;
338 if (m->is_inflated && mono_method_get_context (m)->method_inst) {
339 #ifdef MONO_ARCH_RGCTX_REG
340 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext*)mono_arch_find_static_call_vtable (regs, code);
342 klass = mrgctx->class_vtable->klass;
343 method_inst = mrgctx->method_inst;
345 g_assert_not_reached ();
347 } else if ((m->flags & METHOD_ATTRIBUTE_STATIC) || m->klass->valuetype) {
348 #ifdef MONO_ARCH_RGCTX_REG
349 MonoVTable *vtable = mono_arch_find_static_call_vtable (regs, code);
351 klass = vtable->klass;
353 g_assert_not_reached ();
356 #ifdef MONO_ARCH_HAVE_IMT
357 MonoObject *this_argument = mono_arch_find_this_argument (regs, m,
358 mono_get_generic_context_from_code (code));
360 vt = this_argument->vtable;
361 vtable_slot = mono_get_vcall_slot_addr (code, regs);
363 g_assert (this_argument->vtable->klass->inited);
364 //mono_class_init (this_argument->vtable->klass);
367 klass = this_argument->vtable->klass->supertypes [m->klass->idepth - 1];
373 g_assert (vtable_slot || klass);
376 int displacement = vtable_slot - ((gpointer*)vt);
378 g_assert_not_reached ();
380 g_assert (displacement > 0);
382 actual_method = vt->klass->vtable [displacement];
386 MonoGenericContext context = { NULL, NULL };
389 declaring = mono_method_get_declaring_generic_method (m);
393 if (klass->generic_class)
394 context.class_inst = klass->generic_class->context.class_inst;
395 else if (klass->generic_container)
396 context.class_inst = klass->generic_container->context.class_inst;
397 context.method_inst = method_inst;
399 actual_method = mono_class_inflate_generic_method (declaring, &context);
401 actual_method = mono_class_get_method_generic (klass, m);
405 g_assert (actual_method->klass == klass);
407 if (actual_method->is_inflated)
408 declaring = mono_method_get_declaring_generic_method (actual_method);
415 if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
419 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
423 /* Avoid recursion */
424 if (!(ji && ji->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED))
425 m = mono_marshal_get_synchronized_wrapper (m);
428 /* Calls made through delegates on platforms without delegate trampolines */
429 if (!code && mono_method_needs_static_rgctx_invoke (m, FALSE))
430 need_rgctx_tramp = TRUE;
432 addr = mono_compile_method (m);
435 mono_debugger_trampoline_compiled (m, addr);
437 if (need_rgctx_tramp)
438 addr = mono_create_static_rgctx_trampoline (m, addr);
440 if (generic_virtual) {
442 MonoVTable *vt = mono_arch_get_vcall_slot (code, regs, &displacement);
444 vtable_slot = mono_get_vcall_slot_addr (code, regs);
445 g_assert (vtable_slot);
447 if (vt->klass->valuetype)
448 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr, need_rgctx_tramp);
450 mono_method_add_generic_virtual_invocation (mono_domain_get (),
452 generic_virtual, addr);
457 /* the method was jumped to */
459 MonoDomain *domain = mono_domain_get ();
461 /* Patch the got entries pointing to this method */
463 * We do this here instead of in mono_codegen () to cover the case when m
464 * was loaded from an aot image.
466 if (domain_jit_info (domain)->jump_target_got_slot_hash) {
469 mono_domain_lock (domain);
470 list = g_hash_table_lookup (domain_jit_info (domain)->jump_target_got_slot_hash, m);
472 for (tmp = list; tmp; tmp = tmp->next) {
473 gpointer *got_slot = tmp->data;
476 g_hash_table_remove (domain_jit_info (domain)->jump_target_got_slot_hash, m);
479 mono_domain_unlock (domain);
485 vtable_slot = mono_get_vcall_slot_addr (code, regs);
488 if (m->klass->valuetype)
489 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr, need_rgctx_tramp);
490 g_assert (*vtable_slot);
492 if (!proxy && (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))) {
493 #ifdef MONO_ARCH_HAVE_IMT
494 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, NULL, &need_rgctx_tramp);
496 *vtable_slot = mono_get_addr_from_ftnptr (addr);
500 guint8 *plt_entry = mono_aot_get_plt_entry (code);
503 mono_arch_patch_plt_entry (plt_entry, NULL, regs, addr);
504 } else if (!generic_shared || (m->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
505 mono_domain_lookup_shared_generic (mono_domain_get (), declaring)) {
506 if (generic_shared) {
507 if (m->wrapper_type != MONO_WRAPPER_NONE)
508 m = mono_marshal_method_from_wrapper (m);
509 g_assert (mono_method_is_generic_sharable_impl (m, FALSE));
512 /* Patch calling code */
517 mono_jit_info_table_find (mono_domain_get (), (char*)code);
518 MonoJitInfo *target_ji =
519 mono_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (addr));
521 if (mono_method_same_domain (ji, target_ji))
522 mono_arch_patch_callsite (ji->code_start, code, addr);
532 * mono_llvm_vcall_trampoline:
534 * This trampoline handles virtual calls when using LLVM.
537 mono_llvm_vcall_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
542 gpointer *vtable_slot;
543 gboolean proxy = FALSE;
544 gboolean need_rgctx_tramp = FALSE;
547 * We have the method which is called, we need to obtain the vtable slot without
548 * disassembly which is impossible with LLVM.
549 * So we use the this argument.
551 this = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (m), regs, code);
556 g_assert (!m->is_generic);
558 /* This is a simplified version of mono_magic_trampoline () */
559 /* FIXME: Avoid code duplication */
561 if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
565 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
569 /* Avoid recursion */
570 if (!(ji && ji->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED))
571 m = mono_marshal_get_synchronized_wrapper (m);
574 addr = mono_compile_method (m);
577 if (m->klass->valuetype)
578 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr, need_rgctx_tramp);
580 vtable_slot = &(vt->vtable [mono_method_get_vtable_slot (m)]);
581 g_assert (*vtable_slot);
583 if (!proxy && (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))) {
584 #ifdef MONO_ARCH_HAVE_IMT
585 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, m, NULL, &need_rgctx_tramp);
587 *vtable_slot = mono_get_addr_from_ftnptr (addr);
590 mono_debugger_trampoline_compiled (m, addr);
597 mono_generic_virtual_remoting_trampoline (mgreg_t *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
599 MonoGenericContext context = { NULL, NULL };
600 MonoMethod *imt_method, *declaring;
603 g_assert (m->is_generic);
606 declaring = mono_method_get_declaring_generic_method (m);
610 if (m->klass->generic_class)
611 context.class_inst = m->klass->generic_class->context.class_inst;
613 g_assert (!m->klass->generic_container);
615 #ifdef MONO_ARCH_HAVE_IMT
616 imt_method = mono_arch_find_imt_method (regs, code);
617 if (imt_method->is_inflated)
618 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
620 m = mono_class_inflate_generic_method (declaring, &context);
621 m = mono_marshal_get_remoting_invoke_with_check (m);
623 addr = mono_compile_method (m);
626 mono_debugger_trampoline_compiled (m, addr);
632 * mono_aot_trampoline:
634 * This trampoline handles calls made from AOT code. We try to bypass the
635 * normal JIT compilation logic to avoid loading the metadata for the method.
637 #ifdef MONO_ARCH_AOT_SUPPORTED
639 mono_aot_trampoline (mgreg_t *regs, guint8 *code, guint8 *token_info,
644 MonoMethod *method = NULL;
646 gpointer *vtable_slot;
647 gboolean is_got_entry;
649 gboolean need_rgctx_tramp = FALSE;
651 image = *(gpointer*)(gpointer)token_info;
652 token_info += sizeof (gpointer);
653 token = *(guint32*)(gpointer)token_info;
655 addr = mono_aot_get_method_from_token (mono_domain_get (), image, token);
657 method = mono_get_method (image, token, NULL);
660 /* Use the generic code */
661 return mono_magic_trampoline (regs, code, method, tramp);
664 addr = mono_create_ftnptr (mono_domain_get (), addr);
666 vtable_slot = mono_get_vcall_slot_addr (code, regs);
667 g_assert (!vtable_slot);
669 /* This is a normal call through a PLT entry */
670 plt_entry = mono_aot_get_plt_entry (code);
671 g_assert (plt_entry);
673 mono_arch_patch_plt_entry (plt_entry, NULL, regs, addr);
675 is_got_entry = FALSE;
678 * Since AOT code is only used in the root domain,
679 * mono_domain_get () != mono_get_root_domain () means the calling method
680 * is AppDomain:InvokeInDomain, so this is the same check as in
681 * mono_method_same_domain () but without loading the metadata for the method.
683 if ((is_got_entry && (mono_domain_get () == mono_get_root_domain ())) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot)) {
684 #ifdef MONO_ARCH_HAVE_IMT
686 method = mono_get_method (image, token, NULL);
687 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, regs, code, method, NULL, &need_rgctx_tramp);
696 * mono_aot_plt_trampoline:
698 * This trampoline handles calls made from AOT code through the PLT table.
701 mono_aot_plt_trampoline (mgreg_t *regs, guint8 *code, guint8 *aot_module,
704 guint32 plt_info_offset = mono_aot_get_plt_info_offset (regs, code);
706 return mono_aot_plt_resolve (aot_module, plt_info_offset, code);
711 * mono_class_init_trampoline:
713 * This method calls mono_runtime_class_init () to run the static constructor
714 * for the type, then patches the caller code so it is not called again.
717 mono_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
719 guint8 *plt_entry = mono_aot_get_plt_entry (code);
721 mono_runtime_class_init (vtable);
724 mono_arch_nullify_plt_entry (plt_entry, regs);
726 mono_arch_nullify_class_init_trampoline (code, regs);
731 * mono_generic_class_init_trampoline:
733 * This method calls mono_runtime_class_init () to run the static constructor
737 mono_generic_class_init_trampoline (mgreg_t *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
739 mono_runtime_class_init (vtable);
743 mono_rgctx_lazy_fetch_trampoline (mgreg_t *regs, guint8 *code, gpointer data, guint8 *tramp)
745 #ifdef MONO_ARCH_VTABLE_REG
746 static gboolean inited = FALSE;
747 static int num_lookups = 0;
748 guint32 slot = GPOINTER_TO_UINT (data);
749 mgreg_t *r = (mgreg_t*)regs;
750 gpointer arg = (gpointer)(gssize)r [MONO_ARCH_VTABLE_REG];
751 guint32 index = MONO_RGCTX_SLOT_INDEX (slot);
752 gboolean mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
755 mono_counters_register ("RGCTX unmanaged lookups", MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_lookups);
762 return mono_method_fill_runtime_generic_context (arg, index);
764 return mono_class_fill_runtime_generic_context (arg, index);
766 g_assert_not_reached ();
771 mono_monitor_enter_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
773 mono_monitor_enter (obj);
777 mono_monitor_exit_trampoline (mgreg_t *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
779 mono_monitor_exit (obj);
782 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
785 * mono_delegate_trampoline:
787 * This trampoline handles calls made to Delegate:Invoke ().
788 * This is called once the first time a delegate is invoked, so it must be fast.
791 mono_delegate_trampoline (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
793 MonoDomain *domain = mono_domain_get ();
794 MonoDelegate *delegate;
797 MonoMethod *method = NULL;
798 gboolean multicast, callvirt;
799 gboolean need_rgctx_tramp = FALSE;
800 MonoMethod *invoke = tramp_data [0];
801 guint8 *impl_this = tramp_data [1];
802 guint8 *impl_nothis = tramp_data [2];
804 /* Obtain the delegate object according to the calling convention */
807 * Avoid calling mono_get_generic_context_from_code () now since it is expensive,
808 * get_this_arg_from_call will call it if needed.
810 delegate = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (invoke), regs, code);
812 if (delegate->method) {
813 method = delegate->method;
816 * delegate->method_ptr == NULL means the delegate was initialized by
817 * mini_delegate_ctor, while != NULL means it is initialized by
818 * mono_delegate_ctor_with_method (). In both cases, we need to add wrappers
819 * (ctor_with_method () does this, but it doesn't store the wrapper back into
822 if (delegate->target && delegate->target->vtable->klass == mono_defaults.transparent_proxy_class)
823 method = mono_marshal_get_remoting_invoke (method);
824 else if (mono_method_signature (method)->hasthis && method->klass->valuetype)
825 method = mono_marshal_get_unbox_wrapper (method);
827 ji = mono_jit_info_table_find (domain, mono_get_addr_from_ftnptr (delegate->method_ptr));
831 callvirt = !delegate->target && method && mono_method_signature (method)->hasthis;
833 if (method && method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
834 method = mono_marshal_get_synchronized_wrapper (method);
836 if (method && mono_method_needs_static_rgctx_invoke (method, FALSE))
837 need_rgctx_tramp = TRUE;
840 * If the called address is a trampoline, replace it with the compiled method so
841 * further calls don't have to go through the trampoline.
843 if (method && !callvirt) {
844 /* Avoid the overhead of looking up an already compiled method if possible */
845 if (delegate->method_code && *delegate->method_code) {
846 delegate->method_ptr = *delegate->method_code;
848 delegate->method_ptr = mono_compile_method (method);
849 if (delegate->method_code)
850 *delegate->method_code = delegate->method_ptr;
851 mono_debugger_trampoline_compiled (method, delegate->method_ptr);
855 if (need_rgctx_tramp)
856 delegate->method_ptr = mono_create_static_rgctx_trampoline (method, delegate->method_ptr);
858 multicast = ((MonoMulticastDelegate*)delegate)->prev != NULL;
859 if (!multicast && !callvirt) {
860 if (method && (method->flags & METHOD_ATTRIBUTE_STATIC) && mono_method_signature (method)->param_count == mono_method_signature (invoke)->param_count + 1)
861 /* Closed static delegate */
864 code = delegate->target ? impl_this : impl_nothis;
867 delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
872 /* The general, unoptimized case */
873 m = mono_marshal_get_delegate_invoke (invoke, delegate);
874 code = mono_compile_method (m);
875 delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
876 mono_debugger_trampoline_compiled (m, delegate->invoke_impl);
884 * mono_get_trampoline_func:
886 * Return the C function which needs to be called by the generic trampoline of type
890 mono_get_trampoline_func (MonoTrampolineType tramp_type)
892 switch (tramp_type) {
893 case MONO_TRAMPOLINE_JIT:
894 case MONO_TRAMPOLINE_JUMP:
895 return mono_magic_trampoline;
896 case MONO_TRAMPOLINE_CLASS_INIT:
897 return mono_class_init_trampoline;
898 case MONO_TRAMPOLINE_GENERIC_CLASS_INIT:
899 return mono_generic_class_init_trampoline;
900 case MONO_TRAMPOLINE_RGCTX_LAZY_FETCH:
901 return mono_rgctx_lazy_fetch_trampoline;
902 #ifdef MONO_ARCH_AOT_SUPPORTED
903 case MONO_TRAMPOLINE_AOT:
904 return mono_aot_trampoline;
905 case MONO_TRAMPOLINE_AOT_PLT:
906 return mono_aot_plt_trampoline;
908 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
909 case MONO_TRAMPOLINE_DELEGATE:
910 return mono_delegate_trampoline;
912 case MONO_TRAMPOLINE_RESTORE_STACK_PROT:
913 return mono_altstack_restore_prot;
914 case MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING:
915 return mono_generic_virtual_remoting_trampoline;
916 case MONO_TRAMPOLINE_MONITOR_ENTER:
917 return mono_monitor_enter_trampoline;
918 case MONO_TRAMPOLINE_MONITOR_EXIT:
919 return mono_monitor_exit_trampoline;
921 case MONO_TRAMPOLINE_LLVM_VCALL:
922 return mono_llvm_vcall_trampoline;
925 g_assert_not_reached ();
931 mono_trampolines_init (void)
933 InitializeCriticalSection (&trampolines_mutex);
938 mono_trampoline_code [MONO_TRAMPOLINE_JIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JIT);
939 mono_trampoline_code [MONO_TRAMPOLINE_JUMP] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JUMP);
940 mono_trampoline_code [MONO_TRAMPOLINE_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
941 mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
942 mono_trampoline_code [MONO_TRAMPOLINE_RGCTX_LAZY_FETCH] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RGCTX_LAZY_FETCH);
943 #ifdef MONO_ARCH_AOT_SUPPORTED
944 mono_trampoline_code [MONO_TRAMPOLINE_AOT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT);
945 mono_trampoline_code [MONO_TRAMPOLINE_AOT_PLT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT_PLT);
947 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
948 mono_trampoline_code [MONO_TRAMPOLINE_DELEGATE] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_DELEGATE);
950 mono_trampoline_code [MONO_TRAMPOLINE_RESTORE_STACK_PROT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RESTORE_STACK_PROT);
951 mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING);
952 mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_ENTER] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
953 mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_EXIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
955 mono_trampoline_code [MONO_TRAMPOLINE_LLVM_VCALL] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_LLVM_VCALL);
960 mono_trampolines_cleanup (void)
962 if (class_init_hash_addr)
963 g_hash_table_destroy (class_init_hash_addr);
965 DeleteCriticalSection (&trampolines_mutex);
969 mono_get_trampoline_code (MonoTrampolineType tramp_type)
971 g_assert (mono_trampoline_code [tramp_type]);
973 return mono_trampoline_code [tramp_type];
977 mono_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
980 return mono_aot_create_specific_trampoline (mono_defaults.corlib, arg1, tramp_type, domain, code_len);
982 return mono_arch_create_specific_trampoline (arg1, tramp_type, domain, code_len);
986 mono_create_class_init_trampoline (MonoVTable *vtable)
989 MonoDomain *domain = vtable->domain;
991 g_assert (!vtable->klass->generic_container);
993 /* previously created trampoline code */
994 mono_domain_lock (domain);
996 g_hash_table_lookup (domain_jit_info (domain)->class_init_trampoline_hash,
998 mono_domain_unlock (domain);
1002 code = mono_create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, domain, NULL);
1004 ptr = mono_create_ftnptr (domain, code);
1006 /* store trampoline address */
1007 mono_domain_lock (domain);
1008 g_hash_table_insert (domain_jit_info (domain)->class_init_trampoline_hash,
1010 mono_domain_unlock (domain);
1012 mono_trampolines_lock ();
1013 if (!class_init_hash_addr)
1014 class_init_hash_addr = g_hash_table_new (NULL, NULL);
1015 g_hash_table_insert (class_init_hash_addr, ptr, vtable);
1016 mono_trampolines_unlock ();
1022 mono_create_generic_class_init_trampoline (void)
1024 #ifdef MONO_ARCH_VTABLE_REG
1025 static gpointer code;
1027 mono_trampolines_lock ();
1031 code = mono_aot_get_named_code ("generic_class_init_trampoline");
1033 code = mono_arch_create_generic_class_init_trampoline ();
1036 mono_trampolines_unlock ();
1040 g_assert_not_reached ();
1045 mono_create_jump_trampoline (MonoDomain *domain, MonoMethod *method, gboolean add_sync_wrapper)
1049 guint32 code_size = 0;
1051 code = mono_jit_find_compiled_method_with_jit_info (domain, method, &ji);
1053 * We cannot recover the correct type of a shared generic
1054 * method from its native code address, so we use the
1055 * trampoline instead.
1057 if (code && !ji->has_generic_jit_info)
1060 mono_domain_lock (domain);
1061 code = g_hash_table_lookup (domain_jit_info (domain)->jump_trampoline_hash, method);
1062 mono_domain_unlock (domain);
1066 code = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get (), &code_size);
1067 g_assert (code_size);
1069 ji = mono_domain_alloc0 (domain, MONO_SIZEOF_JIT_INFO);
1070 ji->code_start = code;
1071 ji->code_size = code_size;
1072 ji->method = method;
1075 * mono_delegate_ctor needs to find the method metadata from the
1076 * trampoline address, so we save it here.
1079 mono_jit_info_table_add (domain, ji);
1081 mono_domain_lock (domain);
1082 g_hash_table_insert (domain_jit_info (domain)->jump_trampoline_hash, method, ji->code_start);
1083 mono_domain_unlock (domain);
1085 return ji->code_start;
1089 mono_create_jit_trampoline_in_domain (MonoDomain *domain, MonoMethod *method)
1093 if (mono_aot_only) {
1094 /* Avoid creating trampolines if possible */
1095 gpointer code = mono_jit_find_compiled_method (domain, method);
1101 mono_domain_lock (domain);
1102 tramp = g_hash_table_lookup (domain_jit_info (domain)->jit_trampoline_hash, method);
1103 mono_domain_unlock (domain);
1107 tramp = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JIT, domain, NULL);
1109 mono_domain_lock (domain);
1110 g_hash_table_insert (domain_jit_info (domain)->jit_trampoline_hash, method, tramp);
1111 mono_domain_unlock (domain);
1113 mono_jit_stats.method_trampolines++;
1119 mono_create_jit_trampoline (MonoMethod *method)
1121 return mono_create_jit_trampoline_in_domain (mono_domain_get (), method);
1125 mono_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
1129 MonoDomain *domain = mono_domain_get ();
1130 guint8 *buf, *start;
1132 buf = start = mono_domain_code_reserve (domain, 2 * sizeof (gpointer));
1134 *(gpointer*)(gpointer)buf = image;
1135 buf += sizeof (gpointer);
1136 *(guint32*)(gpointer)buf = token;
1138 tramp = mono_create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain, NULL);
1140 mono_jit_stats.method_trampolines++;
1146 mono_create_delegate_trampoline (MonoClass *klass)
1148 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1149 MonoDomain *domain = mono_domain_get ();
1151 guint32 code_size = 0;
1152 gpointer *tramp_data;
1155 mono_domain_lock (domain);
1156 ptr = g_hash_table_lookup (domain_jit_info (domain)->delegate_trampoline_hash, klass);
1157 mono_domain_unlock (domain);
1161 // Precompute the delegate invoke impl and pass it to the delegate trampoline
1162 invoke = mono_get_delegate_invoke (klass);
1165 tramp_data = mono_domain_alloc (domain, sizeof (gpointer) * 3);
1166 tramp_data [0] = invoke;
1167 tramp_data [1] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), TRUE);
1168 tramp_data [2] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), FALSE);
1170 ptr = mono_create_specific_trampoline (tramp_data, MONO_TRAMPOLINE_DELEGATE, mono_domain_get (), &code_size);
1171 g_assert (code_size);
1173 /* store trampoline address */
1174 mono_domain_lock (domain);
1175 g_hash_table_insert (domain_jit_info (domain)->delegate_trampoline_hash,
1177 mono_domain_unlock (domain);
1186 mono_create_rgctx_lazy_fetch_trampoline (guint32 offset)
1188 static gboolean inited = FALSE;
1189 static int num_trampolines = 0;
1191 gpointer tramp, ptr;
1194 return mono_aot_get_lazy_fetch_trampoline (offset);
1196 mono_trampolines_lock ();
1197 if (rgctx_lazy_fetch_trampoline_hash)
1198 tramp = g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset));
1201 mono_trampolines_unlock ();
1205 tramp = mono_arch_create_rgctx_lazy_fetch_trampoline (offset);
1206 ptr = mono_create_ftnptr (mono_get_root_domain (), tramp);
1208 mono_trampolines_lock ();
1209 if (!rgctx_lazy_fetch_trampoline_hash) {
1210 rgctx_lazy_fetch_trampoline_hash = g_hash_table_new (NULL, NULL);
1211 rgctx_lazy_fetch_trampoline_hash_addr = g_hash_table_new (NULL, NULL);
1213 g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset), ptr);
1214 g_assert (offset != -1);
1215 g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash_addr, ptr, GUINT_TO_POINTER (offset + 1));
1216 mono_trampolines_unlock ();
1219 mono_counters_register ("RGCTX num lazy fetch trampolines",
1220 MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_trampolines);
1229 mono_create_monitor_enter_trampoline (void)
1231 static gpointer code;
1233 if (mono_aot_only) {
1235 code = mono_aot_get_named_code ("monitor_enter_trampoline");
1239 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1240 mono_trampolines_lock ();
1243 code = mono_arch_create_monitor_enter_trampoline ();
1245 mono_trampolines_unlock ();
1248 g_assert_not_reached ();
1255 mono_create_monitor_exit_trampoline (void)
1257 static gpointer code;
1259 if (mono_aot_only) {
1261 code = mono_aot_get_named_code ("monitor_exit_trampoline");
1265 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1266 mono_trampolines_lock ();
1269 code = mono_arch_create_monitor_exit_trampoline ();
1271 mono_trampolines_unlock ();
1274 g_assert_not_reached ();
1281 * mono_create_llvm_vcall_trampoline:
1283 * LLVM emits code for virtual calls which mono_get_vcall_slot is unable to
1284 * decode, i.e. only the final branch address is available:
1285 * mov <offset>(%rax), %rax
1286 * <random code inserted by instruction scheduling>
1289 * To work around this problem, we don't use the common vtable trampoline when
1290 * llvm is enabled. Instead, we use one trampoline per method.
1293 mono_create_llvm_vcall_trampoline (MonoMethod *method)
1298 domain = mono_domain_get ();
1300 mono_domain_lock (domain);
1301 res = g_hash_table_lookup (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method);
1302 mono_domain_unlock (domain);
1306 res = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_LLVM_VCALL, domain, NULL);
1308 mono_domain_lock (domain);
1309 g_hash_table_insert (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method, res);
1310 mono_domain_unlock (domain);
1317 mono_find_class_init_trampoline_by_addr (gconstpointer addr)
1321 mono_trampolines_lock ();
1322 if (class_init_hash_addr)
1323 res = g_hash_table_lookup (class_init_hash_addr, addr);
1326 mono_trampolines_unlock ();
1331 mono_find_rgctx_lazy_fetch_trampoline_by_addr (gconstpointer addr)
1335 mono_trampolines_lock ();
1336 if (rgctx_lazy_fetch_trampoline_hash_addr) {
1337 /* We store the real offset + 1 so we can detect when the lookup fails */
1338 offset = GPOINTER_TO_INT (g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash_addr, addr));
1346 mono_trampolines_unlock ();