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)
36 return mono_aot_get_unbox_trampoline (m);
38 return mono_arch_get_unbox_trampoline (gsctx, m, addr);
41 #ifdef MONO_ARCH_HAVE_STATIC_RGCTX_TRAMPOLINE
43 * mono_create_static_rgctx_trampoline:
45 * Return a static rgctx trampoline for M which branches to ADDR which should
46 * point to the compiled code of M.
48 * Static rgctx trampolines are used when a shared generic method which doesn't
49 * have a this argument is called indirectly, ie. from code which can't pass in
50 * the rgctx argument. The trampoline sets the rgctx argument and jumps to the
51 * methods code. These trampolines are similar to the unbox trampolines, they
52 * perform the same task as the static rgctx wrappers, but they are smaller/faster,
53 * and can be made to work with full AOT.
56 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
62 if (mini_method_get_context (m)->method_inst)
63 ctx = mono_method_lookup_rgctx (mono_class_vtable (mono_domain_get (), m->klass), mini_method_get_context (m)->method_inst);
65 ctx = mono_class_vtable (mono_domain_get (), m->klass);
68 return mono_aot_get_static_rgctx_trampoline (ctx, addr);
70 domain = mono_domain_get ();
72 mono_domain_lock (domain);
73 res = g_hash_table_lookup (domain_jit_info (domain)->static_rgctx_trampoline_hash,
75 mono_domain_unlock (domain);
79 res = mono_arch_get_static_rgctx_trampoline (m, ctx, addr);
81 mono_domain_lock (domain);
82 /* Duplicates inserted while we didn't hold the lock are OK */
83 g_hash_table_insert (domain_jit_info (domain)->static_rgctx_trampoline_hash, m, res);
84 mono_domain_unlock (domain);
90 mono_create_static_rgctx_trampoline (MonoMethod *m, gpointer addr)
93 * This shouldn't happen as all arches which support generic sharing support
94 * static rgctx trampolines as well.
96 g_assert_not_reached ();
101 mono_get_vcall_slot_addr (guint8* code, gpointer *regs)
105 vt = mono_arch_get_vcall_slot (code, regs, &displacement);
108 return (gpointer*)((char*)vt + displacement);
111 #ifdef MONO_ARCH_HAVE_IMT
114 mono_convert_imt_slot_to_vtable_slot (gpointer* slot, gpointer *regs, guint8 *code, MonoMethod *method, MonoMethod **impl_method, gboolean *need_rgctx_tramp)
116 MonoGenericSharingContext *gsctx = mono_get_generic_context_from_code (code);
117 MonoObject *this_argument = mono_arch_find_this_argument (regs, method, gsctx);
118 MonoVTable *vt = this_argument->vtable;
119 int displacement = slot - ((gpointer*)vt);
121 if (displacement > 0) {
122 /* slot is in the vtable, not in the IMT */
124 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p is in the vtable, not in the IMT\n", slot);
128 MonoMethod *imt_method = mono_arch_find_imt_method (regs, code);
129 int interface_offset;
130 int imt_slot = MONO_IMT_SIZE + displacement;
132 interface_offset = mono_class_interface_offset (vt->klass, imt_method->klass);
134 if (interface_offset < 0) {
135 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));
136 g_assert_not_reached ();
138 mono_vtable_build_imt_slot (vt, mono_method_get_imt_slot (imt_method));
143 if (imt_method->is_inflated && ((MonoMethodInflated*)imt_method)->context.method_inst) {
144 MonoGenericContext context = { NULL, NULL };
147 * Generic virtual method, imt_method contains the inflated interface
148 * method, need to get the inflated impl method.
150 /* imt_method->slot might not be set */
151 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + mono_method_get_declaring_generic_method (imt_method)->slot);
153 if (impl->klass->generic_class)
154 context.class_inst = impl->klass->generic_class->context.class_inst;
155 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
156 impl = mono_class_inflate_generic_method (impl, &context);
158 impl = mono_class_get_vtable_entry (vt->klass, interface_offset + imt_method->slot);
161 if (mono_method_needs_static_rgctx_invoke (impl, FALSE))
162 *need_rgctx_tramp = TRUE;
166 printf ("mono_convert_imt_slot_to_vtable_slot: method = %s.%s.%s, imt_method = %s.%s.%s\n",
167 method->klass->name_space, method->klass->name, method->name,
168 imt_method->klass->name_space, imt_method->klass->name, imt_method->name);
171 g_assert (imt_slot < MONO_IMT_SIZE);
172 if (vt->imt_collisions_bitmap & (1 << imt_slot)) {
173 int vtable_offset = interface_offset + mono_method_get_vtable_index (imt_method);
174 gpointer *vtable_slot = & (vt->vtable [vtable_offset]);
176 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);
181 printf ("mono_convert_imt_slot_to_vtable_slot: slot %p[%d] is in the IMT, but not colliding\n", slot, imt_slot);
190 * mono_magic_trampoline:
192 * This trampoline handles calls from JITted code.
195 mono_magic_trampoline (gssize *regs, guint8 *code, MonoMethod *m, guint8* tramp)
198 gpointer *vtable_slot;
199 gboolean generic_shared = FALSE;
200 MonoMethod *declaring = NULL;
201 MonoMethod *generic_virtual = NULL;
203 gboolean proxy = FALSE;
204 gboolean need_rgctx_tramp = FALSE;
206 if (m == MONO_FAKE_VTABLE_METHOD) {
208 MonoVTable *vt = mono_arch_get_vcall_slot (code, (gpointer*)regs, &displacement);
213 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
215 printf ("Caller: %s\n", mono_method_full_name (ji->method, TRUE));
216 /* Print some debug info */
217 for (i = 0; i < 32; ++i)
218 printf ("0x%x ", code [-32 + i]);
222 if (displacement > 0) {
223 displacement -= G_STRUCT_OFFSET (MonoVTable, vtable);
224 g_assert (displacement >= 0);
225 displacement /= sizeof (gpointer);
227 /* Avoid loading metadata or creating a generic vtable if possible */
228 addr = mono_aot_get_method_from_vt_slot (mono_domain_get (), vt, displacement);
230 addr = mono_create_ftnptr (mono_domain_get (), addr);
231 if (addr && !vt->klass->valuetype) {
232 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
233 if (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot)) {
234 *vtable_slot = mono_get_addr_from_ftnptr (addr);
240 m = mono_class_get_vtable_entry (vt->klass, displacement);
241 if (mono_method_needs_static_rgctx_invoke (m, FALSE))
242 need_rgctx_tramp = TRUE;
244 /*g_print ("%s with disp %d: %s at %p\n", vt->klass->name, displacement, m->name, code);*/
246 /* We got here from an interface method: redirect to IMT handling */
247 m = MONO_FAKE_IMT_METHOD;
248 /*g_print ("vtable with disp %d at %p\n", displacement, code);*/
252 /* this is the IMT trampoline */
253 #ifdef MONO_ARCH_HAVE_IMT
254 if (m == MONO_FAKE_IMT_METHOD) {
255 MonoMethod *impl_method;
256 MonoGenericSharingContext *gsctx;
257 MonoObject *this_arg;
259 /* we get the interface method because mono_convert_imt_slot_to_vtable_slot ()
260 * needs the signature to be able to find the this argument
262 m = mono_arch_find_imt_method ((gpointer*)regs, code);
263 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
264 g_assert (vtable_slot);
266 gsctx = mono_get_generic_context_from_code (code);
267 this_arg = mono_arch_find_this_argument ((gpointer*)regs, m, gsctx);
269 if (this_arg->vtable->klass == mono_defaults.transparent_proxy_class) {
270 /* Use the slow path for now */
272 m = mono_object_get_virtual_method (this_arg, m);
274 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, (gpointer*)regs, code, m, &impl_method, &need_rgctx_tramp);
275 /* mono_convert_imt_slot_to_vtable_slot () also gives us the method that is supposed
276 * to be called, so we compile it and go ahead as usual.
278 /*g_print ("imt found method %p (%s) at %p\n", impl_method, impl_method->name, code);*/
279 if (m->is_inflated && ((MonoMethodInflated*)m)->context.method_inst) {
280 /* Generic virtual method */
283 need_rgctx_tramp = TRUE;
292 MonoGenericContext context = { NULL, NULL };
293 MonoMethod *declaring;
296 declaring = mono_method_get_declaring_generic_method (m);
300 if (m->klass->generic_class)
301 context.class_inst = m->klass->generic_class->context.class_inst;
303 g_assert (!m->klass->generic_container);
305 #ifdef MONO_ARCH_HAVE_IMT
306 generic_virtual = mono_arch_find_imt_method ((gpointer*)regs, code);
308 if (generic_virtual) {
309 g_assert (generic_virtual->is_inflated);
310 context.method_inst = ((MonoMethodInflated*)generic_virtual)->context.method_inst;
313 m = mono_class_inflate_generic_method (declaring, &context);
314 /* FIXME: only do this if the method is sharable */
315 need_rgctx_tramp = TRUE;
316 } else if ((context_used = mono_method_check_context_used (m))) {
317 MonoClass *klass = NULL;
318 MonoMethod *actual_method = NULL;
319 MonoVTable *vt = NULL;
320 MonoGenericInst *method_inst = NULL;
323 generic_shared = TRUE;
327 if (m->is_inflated && mono_method_get_context (m)->method_inst) {
328 #ifdef MONO_ARCH_RGCTX_REG
329 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext*)mono_arch_find_static_call_vtable ((gpointer*)regs, code);
331 klass = mrgctx->class_vtable->klass;
332 method_inst = mrgctx->method_inst;
334 g_assert_not_reached ();
336 } else if ((m->flags & METHOD_ATTRIBUTE_STATIC) || m->klass->valuetype) {
337 #ifdef MONO_ARCH_RGCTX_REG
338 MonoVTable *vtable = mono_arch_find_static_call_vtable ((gpointer*)regs, code);
340 klass = vtable->klass;
342 g_assert_not_reached ();
345 #ifdef MONO_ARCH_HAVE_IMT
346 MonoObject *this_argument = mono_arch_find_this_argument ((gpointer*)regs, m,
347 mono_get_generic_context_from_code (code));
349 vt = this_argument->vtable;
350 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
352 g_assert (this_argument->vtable->klass->inited);
353 //mono_class_init (this_argument->vtable->klass);
356 klass = this_argument->vtable->klass->supertypes [m->klass->idepth - 1];
362 g_assert (vtable_slot || klass);
365 int displacement = vtable_slot - ((gpointer*)vt);
367 g_assert_not_reached ();
369 g_assert (displacement > 0);
371 actual_method = vt->klass->vtable [displacement];
375 MonoGenericContext context = { NULL, NULL };
378 declaring = mono_method_get_declaring_generic_method (m);
382 if (klass->generic_class)
383 context.class_inst = klass->generic_class->context.class_inst;
384 else if (klass->generic_container)
385 context.class_inst = klass->generic_container->context.class_inst;
386 context.method_inst = method_inst;
388 actual_method = mono_class_inflate_generic_method (declaring, &context);
390 actual_method = mono_class_get_method_generic (klass, m);
394 g_assert (actual_method->klass == klass);
396 if (actual_method->is_inflated)
397 declaring = mono_method_get_declaring_generic_method (actual_method);
404 if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
408 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
412 /* Avoid recursion */
413 if (!(ji && ji->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED))
414 m = mono_marshal_get_synchronized_wrapper (m);
417 /* Calls made through delegates on platforms without delegate trampolines */
418 if (!code && mono_method_needs_static_rgctx_invoke (m, FALSE))
419 need_rgctx_tramp = TRUE;
421 addr = mono_compile_method (m);
424 mono_debugger_trampoline_compiled (m, addr);
426 if (need_rgctx_tramp)
427 addr = mono_create_static_rgctx_trampoline (m, addr);
429 if (generic_virtual) {
431 MonoVTable *vt = mono_arch_get_vcall_slot (code, (gpointer*)regs, &displacement);
433 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
434 g_assert (vtable_slot);
436 if (vt->klass->valuetype)
437 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr);
439 mono_method_add_generic_virtual_invocation (mono_domain_get (),
441 generic_virtual, addr);
446 /* the method was jumped to */
448 MonoDomain *domain = mono_domain_get ();
450 /* Patch the got entries pointing to this method */
452 * We do this here instead of in mono_codegen () to cover the case when m
453 * was loaded from an aot image.
455 if (domain_jit_info (domain)->jump_target_got_slot_hash) {
458 mono_domain_lock (domain);
459 list = g_hash_table_lookup (domain_jit_info (domain)->jump_target_got_slot_hash, m);
461 for (tmp = list; tmp; tmp = tmp->next) {
462 gpointer *got_slot = tmp->data;
465 g_hash_table_remove (domain_jit_info (domain)->jump_target_got_slot_hash, m);
468 mono_domain_unlock (domain);
474 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
477 if (m->klass->valuetype)
478 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr);
479 g_assert (*vtable_slot);
481 if (!proxy && (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))) {
482 #ifdef MONO_ARCH_HAVE_IMT
483 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, (gpointer*)regs, code, m, NULL, &need_rgctx_tramp);
485 *vtable_slot = mono_get_addr_from_ftnptr (addr);
489 guint8 *plt_entry = mono_aot_get_plt_entry (code);
492 mono_arch_patch_plt_entry (plt_entry, NULL, regs, addr);
493 } else if (!generic_shared || (m->iflags & METHOD_IMPL_ATTRIBUTE_INTERNAL_CALL) ||
494 mono_domain_lookup_shared_generic (mono_domain_get (), declaring)) {
495 if (generic_shared) {
496 if (m->wrapper_type != MONO_WRAPPER_NONE)
497 m = mono_marshal_method_from_wrapper (m);
498 g_assert (mono_method_is_generic_sharable_impl (m, FALSE));
501 /* Patch calling code */
506 mono_jit_info_table_find (mono_domain_get (), (char*)code);
507 MonoJitInfo *target_ji =
508 mono_jit_info_table_find (mono_domain_get (), mono_get_addr_from_ftnptr (addr));
510 if (mono_method_same_domain (ji, target_ji))
511 mono_arch_patch_callsite (ji->code_start, code, addr);
521 * mono_llvm_vcall_trampoline:
523 * This trampoline handles virtual calls when using LLVM.
526 mono_llvm_vcall_trampoline (gssize *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
531 gpointer *vtable_slot;
532 gboolean proxy = FALSE;
533 gboolean need_rgctx_tramp = FALSE;
536 * We have the method which is called, we need to obtain the vtable slot without
537 * disassembly which is impossible with LLVM.
538 * So we use the this argument.
540 this = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (m), regs, code);
545 g_assert (!m->is_generic);
547 /* This is a simplified version of mono_magic_trampoline () */
548 /* FIXME: Avoid code duplication */
550 if (m->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED) {
554 ji = mono_jit_info_table_find (mono_domain_get (), (char*)code);
558 /* Avoid recursion */
559 if (!(ji && ji->method->wrapper_type == MONO_WRAPPER_SYNCHRONIZED))
560 m = mono_marshal_get_synchronized_wrapper (m);
563 addr = mono_compile_method (m);
566 if (m->klass->valuetype)
567 addr = get_unbox_trampoline (mono_get_generic_context_from_code (code), m, addr);
569 vtable_slot = &(vt->vtable [mono_method_get_vtable_slot (m)]);
570 g_assert (*vtable_slot);
572 if (!proxy && (mono_aot_is_got_entry (code, (guint8*)vtable_slot) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot))) {
573 #ifdef MONO_ARCH_HAVE_IMT
574 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, (gpointer*)regs, code, m, NULL, &need_rgctx_tramp);
576 *vtable_slot = mono_get_addr_from_ftnptr (addr);
579 mono_debugger_trampoline_compiled (m, addr);
586 mono_generic_virtual_remoting_trampoline (gssize *regs, guint8 *code, MonoMethod *m, guint8 *tramp)
588 MonoGenericContext context = { NULL, NULL };
589 MonoMethod *imt_method, *declaring;
592 g_assert (m->is_generic);
595 declaring = mono_method_get_declaring_generic_method (m);
599 if (m->klass->generic_class)
600 context.class_inst = m->klass->generic_class->context.class_inst;
602 g_assert (!m->klass->generic_container);
604 #ifdef MONO_ARCH_HAVE_IMT
605 imt_method = mono_arch_find_imt_method ((gpointer*)regs, code);
606 if (imt_method->is_inflated)
607 context.method_inst = ((MonoMethodInflated*)imt_method)->context.method_inst;
609 m = mono_class_inflate_generic_method (declaring, &context);
610 m = mono_marshal_get_remoting_invoke_with_check (m);
612 addr = mono_compile_method (m);
615 mono_debugger_trampoline_compiled (m, addr);
621 * mono_aot_trampoline:
623 * This trampoline handles calls made from AOT code. We try to bypass the
624 * normal JIT compilation logic to avoid loading the metadata for the method.
626 #ifdef MONO_ARCH_AOT_SUPPORTED
628 mono_aot_trampoline (gssize *regs, guint8 *code, guint8 *token_info,
633 MonoMethod *method = NULL;
635 gpointer *vtable_slot;
636 gboolean is_got_entry;
638 gboolean need_rgctx_tramp = FALSE;
640 image = *(gpointer*)(gpointer)token_info;
641 token_info += sizeof (gpointer);
642 token = *(guint32*)(gpointer)token_info;
644 addr = mono_aot_get_method_from_token (mono_domain_get (), image, token);
646 method = mono_get_method (image, token, NULL);
649 /* Use the generic code */
650 return mono_magic_trampoline (regs, code, method, tramp);
653 addr = mono_create_ftnptr (mono_domain_get (), addr);
655 vtable_slot = mono_get_vcall_slot_addr (code, (gpointer*)regs);
656 g_assert (!vtable_slot);
658 /* This is a normal call through a PLT entry */
659 plt_entry = mono_aot_get_plt_entry (code);
660 g_assert (plt_entry);
662 mono_arch_patch_plt_entry (plt_entry, NULL, regs, addr);
664 is_got_entry = FALSE;
667 * Since AOT code is only used in the root domain,
668 * mono_domain_get () != mono_get_root_domain () means the calling method
669 * is AppDomain:InvokeInDomain, so this is the same check as in
670 * mono_method_same_domain () but without loading the metadata for the method.
672 if ((is_got_entry && (mono_domain_get () == mono_get_root_domain ())) || mono_domain_owns_vtable_slot (mono_domain_get (), vtable_slot)) {
673 #ifdef MONO_ARCH_HAVE_IMT
675 method = mono_get_method (image, token, NULL);
676 vtable_slot = mono_convert_imt_slot_to_vtable_slot (vtable_slot, (gpointer*)regs, code, method, NULL, &need_rgctx_tramp);
685 * mono_aot_plt_trampoline:
687 * This trampoline handles calls made from AOT code through the PLT table.
690 mono_aot_plt_trampoline (gssize *regs, guint8 *code, guint8 *aot_module,
693 guint32 plt_info_offset = mono_aot_get_plt_info_offset (regs, code);
695 return mono_aot_plt_resolve (aot_module, plt_info_offset, code);
700 * mono_class_init_trampoline:
702 * This method calls mono_runtime_class_init () to run the static constructor
703 * for the type, then patches the caller code so it is not called again.
706 mono_class_init_trampoline (gssize *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
708 guint8 *plt_entry = mono_aot_get_plt_entry (code);
710 mono_runtime_class_init (vtable);
713 mono_arch_nullify_plt_entry (plt_entry, regs);
715 mono_arch_nullify_class_init_trampoline (code, regs);
720 * mono_generic_class_init_trampoline:
722 * This method calls mono_runtime_class_init () to run the static constructor
726 mono_generic_class_init_trampoline (gssize *regs, guint8 *code, MonoVTable *vtable, guint8 *tramp)
728 mono_runtime_class_init (vtable);
732 mono_rgctx_lazy_fetch_trampoline (gssize *regs, guint8 *code, gpointer data, guint8 *tramp)
734 #ifdef MONO_ARCH_VTABLE_REG
735 static gboolean inited = FALSE;
736 static int num_lookups = 0;
737 guint32 slot = GPOINTER_TO_UINT (data);
738 gpointer arg = (gpointer)(gssize)regs [MONO_ARCH_VTABLE_REG];
739 guint32 index = MONO_RGCTX_SLOT_INDEX (slot);
740 gboolean mrgctx = MONO_RGCTX_SLOT_IS_MRGCTX (slot);
743 mono_counters_register ("RGCTX unmanaged lookups", MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_lookups);
750 return mono_method_fill_runtime_generic_context (arg, index);
752 return mono_class_fill_runtime_generic_context (arg, index);
754 g_assert_not_reached ();
759 mono_monitor_enter_trampoline (gssize *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
761 mono_monitor_enter (obj);
765 mono_monitor_exit_trampoline (gssize *regs, guint8 *code, MonoObject *obj, guint8 *tramp)
767 mono_monitor_exit (obj);
770 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
773 * mono_delegate_trampoline:
775 * This trampoline handles calls made to Delegate:Invoke ().
776 * This is called once the first time a delegate is invoked, so it must be fast.
779 mono_delegate_trampoline (gssize *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
781 MonoDomain *domain = mono_domain_get ();
782 MonoDelegate *delegate;
785 MonoMethod *method = NULL;
786 gboolean multicast, callvirt;
787 gboolean need_rgctx_tramp = FALSE;
788 MonoMethod *invoke = tramp_data [0];
789 guint8 *impl_this = tramp_data [1];
790 guint8 *impl_nothis = tramp_data [2];
792 /* Obtain the delegate object according to the calling convention */
795 * Avoid calling mono_get_generic_context_from_code () now since it is expensive,
796 * get_this_arg_from_call will call it if needed.
798 delegate = mono_arch_get_this_arg_from_call (NULL, mono_method_signature (invoke), regs, code);
800 if (delegate->method) {
801 method = delegate->method;
804 * delegate->method_ptr == NULL means the delegate was initialized by
805 * mini_delegate_ctor, while != NULL means it is initialized by
806 * mono_delegate_ctor_with_method (). In both cases, we need to add wrappers
807 * (ctor_with_method () does this, but it doesn't store the wrapper back into
810 if (delegate->target && delegate->target->vtable->klass == mono_defaults.transparent_proxy_class)
811 method = mono_marshal_get_remoting_invoke (method);
812 else if (mono_method_signature (method)->hasthis && method->klass->valuetype)
813 method = mono_marshal_get_unbox_wrapper (method);
815 ji = mono_jit_info_table_find (domain, mono_get_addr_from_ftnptr (delegate->method_ptr));
819 callvirt = !delegate->target && method && mono_method_signature (method)->hasthis;
821 if (method && method->iflags & METHOD_IMPL_ATTRIBUTE_SYNCHRONIZED)
822 method = mono_marshal_get_synchronized_wrapper (method);
824 if (method && mono_method_needs_static_rgctx_invoke (method, FALSE))
825 need_rgctx_tramp = TRUE;
828 * If the called address is a trampoline, replace it with the compiled method so
829 * further calls don't have to go through the trampoline.
831 if (method && !callvirt) {
832 /* Avoid the overhead of looking up an already compiled method if possible */
833 if (delegate->method_code && *delegate->method_code) {
834 delegate->method_ptr = *delegate->method_code;
836 delegate->method_ptr = mono_compile_method (method);
837 if (delegate->method_code)
838 *delegate->method_code = delegate->method_ptr;
839 mono_debugger_trampoline_compiled (method, delegate->method_ptr);
843 if (need_rgctx_tramp)
844 delegate->method_ptr = mono_create_static_rgctx_trampoline (method, delegate->method_ptr);
846 multicast = ((MonoMulticastDelegate*)delegate)->prev != NULL;
847 if (!multicast && !callvirt) {
848 if (method && (method->flags & METHOD_ATTRIBUTE_STATIC) && mono_method_signature (method)->param_count == mono_method_signature (invoke)->param_count + 1)
849 /* Closed static delegate */
852 code = delegate->target ? impl_this : impl_nothis;
855 delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
860 /* The general, unoptimized case */
861 m = mono_marshal_get_delegate_invoke (invoke, delegate);
862 code = mono_compile_method (m);
863 delegate->invoke_impl = mono_get_addr_from_ftnptr (code);
864 mono_debugger_trampoline_compiled (m, delegate->invoke_impl);
872 * mono_get_trampoline_func:
874 * Return the C function which needs to be called by the generic trampoline of type
878 mono_get_trampoline_func (MonoTrampolineType tramp_type)
880 switch (tramp_type) {
881 case MONO_TRAMPOLINE_JIT:
882 case MONO_TRAMPOLINE_JUMP:
883 return mono_magic_trampoline;
884 case MONO_TRAMPOLINE_CLASS_INIT:
885 return mono_class_init_trampoline;
886 case MONO_TRAMPOLINE_GENERIC_CLASS_INIT:
887 return mono_generic_class_init_trampoline;
888 case MONO_TRAMPOLINE_RGCTX_LAZY_FETCH:
889 return mono_rgctx_lazy_fetch_trampoline;
890 #ifdef MONO_ARCH_AOT_SUPPORTED
891 case MONO_TRAMPOLINE_AOT:
892 return mono_aot_trampoline;
893 case MONO_TRAMPOLINE_AOT_PLT:
894 return mono_aot_plt_trampoline;
896 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
897 case MONO_TRAMPOLINE_DELEGATE:
898 return mono_delegate_trampoline;
900 case MONO_TRAMPOLINE_RESTORE_STACK_PROT:
901 return mono_altstack_restore_prot;
902 case MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING:
903 return mono_generic_virtual_remoting_trampoline;
904 case MONO_TRAMPOLINE_MONITOR_ENTER:
905 return mono_monitor_enter_trampoline;
906 case MONO_TRAMPOLINE_MONITOR_EXIT:
907 return mono_monitor_exit_trampoline;
909 case MONO_TRAMPOLINE_LLVM_VCALL:
910 return mono_llvm_vcall_trampoline;
913 g_assert_not_reached ();
919 mono_trampolines_init (void)
921 InitializeCriticalSection (&trampolines_mutex);
926 mono_trampoline_code [MONO_TRAMPOLINE_JIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JIT);
927 mono_trampoline_code [MONO_TRAMPOLINE_JUMP] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_JUMP);
928 mono_trampoline_code [MONO_TRAMPOLINE_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_CLASS_INIT);
929 mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_CLASS_INIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_CLASS_INIT);
930 mono_trampoline_code [MONO_TRAMPOLINE_RGCTX_LAZY_FETCH] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RGCTX_LAZY_FETCH);
931 #ifdef MONO_ARCH_AOT_SUPPORTED
932 mono_trampoline_code [MONO_TRAMPOLINE_AOT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT);
933 mono_trampoline_code [MONO_TRAMPOLINE_AOT_PLT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_AOT_PLT);
935 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
936 mono_trampoline_code [MONO_TRAMPOLINE_DELEGATE] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_DELEGATE);
938 mono_trampoline_code [MONO_TRAMPOLINE_RESTORE_STACK_PROT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_RESTORE_STACK_PROT);
939 mono_trampoline_code [MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_GENERIC_VIRTUAL_REMOTING);
940 mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_ENTER] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_ENTER);
941 mono_trampoline_code [MONO_TRAMPOLINE_MONITOR_EXIT] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_MONITOR_EXIT);
943 mono_trampoline_code [MONO_TRAMPOLINE_LLVM_VCALL] = mono_arch_create_trampoline_code (MONO_TRAMPOLINE_LLVM_VCALL);
948 mono_trampolines_cleanup (void)
950 if (class_init_hash_addr)
951 g_hash_table_destroy (class_init_hash_addr);
953 DeleteCriticalSection (&trampolines_mutex);
957 mono_get_trampoline_code (MonoTrampolineType tramp_type)
959 g_assert (mono_trampoline_code [tramp_type]);
961 return mono_trampoline_code [tramp_type];
965 mono_create_specific_trampoline (gpointer arg1, MonoTrampolineType tramp_type, MonoDomain *domain, guint32 *code_len)
968 return mono_aot_create_specific_trampoline (mono_defaults.corlib, arg1, tramp_type, domain, code_len);
970 return mono_arch_create_specific_trampoline (arg1, tramp_type, domain, code_len);
974 mono_create_class_init_trampoline (MonoVTable *vtable)
977 MonoDomain *domain = vtable->domain;
979 g_assert (!vtable->klass->generic_container);
981 /* previously created trampoline code */
982 mono_domain_lock (domain);
984 g_hash_table_lookup (domain_jit_info (domain)->class_init_trampoline_hash,
986 mono_domain_unlock (domain);
990 code = mono_create_specific_trampoline (vtable, MONO_TRAMPOLINE_CLASS_INIT, domain, NULL);
992 ptr = mono_create_ftnptr (domain, code);
994 /* store trampoline address */
995 mono_domain_lock (domain);
996 g_hash_table_insert (domain_jit_info (domain)->class_init_trampoline_hash,
998 mono_domain_unlock (domain);
1000 mono_trampolines_lock ();
1001 if (!class_init_hash_addr)
1002 class_init_hash_addr = g_hash_table_new (NULL, NULL);
1003 g_hash_table_insert (class_init_hash_addr, ptr, vtable);
1004 mono_trampolines_unlock ();
1010 mono_create_generic_class_init_trampoline (void)
1012 #ifdef MONO_ARCH_VTABLE_REG
1013 static gpointer code;
1015 mono_trampolines_lock ();
1019 code = mono_aot_get_named_code ("generic_class_init_trampoline");
1021 code = mono_arch_create_generic_class_init_trampoline ();
1024 mono_trampolines_unlock ();
1028 g_assert_not_reached ();
1033 mono_create_jump_trampoline (MonoDomain *domain, MonoMethod *method, gboolean add_sync_wrapper)
1037 guint32 code_size = 0;
1039 code = mono_jit_find_compiled_method_with_jit_info (domain, method, &ji);
1041 * We cannot recover the correct type of a shared generic
1042 * method from its native code address, so we use the
1043 * trampoline instead.
1045 if (code && !ji->has_generic_jit_info)
1048 mono_domain_lock (domain);
1049 code = g_hash_table_lookup (domain_jit_info (domain)->jump_trampoline_hash, method);
1050 mono_domain_unlock (domain);
1054 code = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JUMP, mono_domain_get (), &code_size);
1055 g_assert (code_size);
1057 ji = mono_domain_alloc0 (domain, sizeof (MonoJitInfo));
1058 ji->code_start = code;
1059 ji->code_size = code_size;
1060 ji->method = method;
1063 * mono_delegate_ctor needs to find the method metadata from the
1064 * trampoline address, so we save it here.
1067 mono_jit_info_table_add (domain, ji);
1069 mono_domain_lock (domain);
1070 g_hash_table_insert (domain_jit_info (domain)->jump_trampoline_hash, method, ji->code_start);
1071 mono_domain_unlock (domain);
1073 return ji->code_start;
1077 mono_create_jit_trampoline_in_domain (MonoDomain *domain, MonoMethod *method)
1081 if (mono_aot_only) {
1082 /* Avoid creating trampolines if possible */
1083 gpointer code = mono_jit_find_compiled_method (domain, method);
1089 mono_domain_lock (domain);
1090 tramp = g_hash_table_lookup (domain_jit_info (domain)->jit_trampoline_hash, method);
1091 mono_domain_unlock (domain);
1095 tramp = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_JIT, domain, NULL);
1097 mono_domain_lock (domain);
1098 g_hash_table_insert (domain_jit_info (domain)->jit_trampoline_hash, method, tramp);
1099 mono_domain_unlock (domain);
1101 mono_jit_stats.method_trampolines++;
1107 mono_create_jit_trampoline (MonoMethod *method)
1109 return mono_create_jit_trampoline_in_domain (mono_domain_get (), method);
1113 mono_create_jit_trampoline_from_token (MonoImage *image, guint32 token)
1117 MonoDomain *domain = mono_domain_get ();
1118 guint8 *buf, *start;
1120 buf = start = mono_domain_code_reserve (domain, 2 * sizeof (gpointer));
1122 *(gpointer*)(gpointer)buf = image;
1123 buf += sizeof (gpointer);
1124 *(guint32*)(gpointer)buf = token;
1126 tramp = mono_create_specific_trampoline (start, MONO_TRAMPOLINE_AOT, domain, NULL);
1128 mono_jit_stats.method_trampolines++;
1134 mono_create_delegate_trampoline (MonoClass *klass)
1136 #ifdef MONO_ARCH_HAVE_CREATE_DELEGATE_TRAMPOLINE
1137 MonoDomain *domain = mono_domain_get ();
1139 guint32 code_size = 0;
1140 gpointer *tramp_data;
1143 mono_domain_lock (domain);
1144 ptr = g_hash_table_lookup (domain_jit_info (domain)->delegate_trampoline_hash, klass);
1145 mono_domain_unlock (domain);
1149 // Precompute the delegate invoke impl and pass it to the delegate trampoline
1150 invoke = mono_get_delegate_invoke (klass);
1153 tramp_data = mono_domain_alloc (domain, sizeof (gpointer) * 3);
1154 tramp_data [0] = invoke;
1155 tramp_data [1] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), TRUE);
1156 tramp_data [2] = mono_arch_get_delegate_invoke_impl (mono_method_signature (invoke), FALSE);
1158 ptr = mono_create_specific_trampoline (tramp_data, MONO_TRAMPOLINE_DELEGATE, mono_domain_get (), &code_size);
1159 g_assert (code_size);
1161 /* store trampoline address */
1162 mono_domain_lock (domain);
1163 g_hash_table_insert (domain_jit_info (domain)->delegate_trampoline_hash,
1165 mono_domain_unlock (domain);
1174 mono_create_rgctx_lazy_fetch_trampoline (guint32 offset)
1176 static gboolean inited = FALSE;
1177 static int num_trampolines = 0;
1179 gpointer tramp, ptr;
1182 return mono_aot_get_lazy_fetch_trampoline (offset);
1184 mono_trampolines_lock ();
1185 if (rgctx_lazy_fetch_trampoline_hash)
1186 tramp = g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset));
1189 mono_trampolines_unlock ();
1193 tramp = mono_arch_create_rgctx_lazy_fetch_trampoline (offset);
1194 ptr = mono_create_ftnptr (mono_get_root_domain (), tramp);
1196 mono_trampolines_lock ();
1197 if (!rgctx_lazy_fetch_trampoline_hash) {
1198 rgctx_lazy_fetch_trampoline_hash = g_hash_table_new (NULL, NULL);
1199 rgctx_lazy_fetch_trampoline_hash_addr = g_hash_table_new (NULL, NULL);
1201 g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash, GUINT_TO_POINTER (offset), ptr);
1202 g_assert (offset != -1);
1203 g_hash_table_insert (rgctx_lazy_fetch_trampoline_hash_addr, ptr, GUINT_TO_POINTER (offset + 1));
1204 mono_trampolines_unlock ();
1207 mono_counters_register ("RGCTX num lazy fetch trampolines",
1208 MONO_COUNTER_GENERICS | MONO_COUNTER_INT, &num_trampolines);
1217 mono_create_monitor_enter_trampoline (void)
1219 static gpointer code;
1221 if (mono_aot_only) {
1223 code = mono_aot_get_named_code ("monitor_enter_trampoline");
1227 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1228 mono_trampolines_lock ();
1231 code = mono_arch_create_monitor_enter_trampoline ();
1233 mono_trampolines_unlock ();
1236 g_assert_not_reached ();
1243 mono_create_monitor_exit_trampoline (void)
1245 static gpointer code;
1247 if (mono_aot_only) {
1249 code = mono_aot_get_named_code ("monitor_exit_trampoline");
1253 #ifdef MONO_ARCH_MONITOR_OBJECT_REG
1254 mono_trampolines_lock ();
1257 code = mono_arch_create_monitor_exit_trampoline ();
1259 mono_trampolines_unlock ();
1262 g_assert_not_reached ();
1269 * mono_create_llvm_vcall_trampoline:
1271 * LLVM emits code for virtual calls which mono_get_vcall_slot is unable to
1272 * decode, i.e. only the final branch address is available:
1273 * mov <offset>(%rax), %rax
1274 * <random code inserted by instruction scheduling>
1277 * To work around this problem, we don't use the common vtable trampoline when
1278 * llvm is enabled. Instead, we use one trampoline per method.
1281 mono_create_llvm_vcall_trampoline (MonoMethod *method)
1286 domain = mono_domain_get ();
1288 mono_domain_lock (domain);
1289 res = g_hash_table_lookup (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method);
1290 mono_domain_unlock (domain);
1294 res = mono_create_specific_trampoline (method, MONO_TRAMPOLINE_LLVM_VCALL, domain, NULL);
1296 mono_domain_lock (domain);
1297 g_hash_table_insert (domain_jit_info (domain)->llvm_vcall_trampoline_hash, method, res);
1298 mono_domain_unlock (domain);
1305 mono_find_class_init_trampoline_by_addr (gconstpointer addr)
1309 mono_trampolines_lock ();
1310 if (class_init_hash_addr)
1311 res = g_hash_table_lookup (class_init_hash_addr, addr);
1314 mono_trampolines_unlock ();
1319 mono_find_rgctx_lazy_fetch_trampoline_by_addr (gconstpointer addr)
1323 mono_trampolines_lock ();
1324 if (rgctx_lazy_fetch_trampoline_hash_addr) {
1325 /* We store the real offset + 1 so we can detect when the lookup fails */
1326 offset = GPOINTER_TO_INT (g_hash_table_lookup (rgctx_lazy_fetch_trampoline_hash_addr, addr));
1334 mono_trampolines_unlock ();