2 * mini-exceptions.c: generic exception support
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Ximian, Inc.
17 #ifdef HAVE_EXECINFO_H
21 #ifdef HAVE_SYS_TYPES_H
22 #include <sys/types.h>
25 #ifdef HAVE_SYS_WAIT_H
33 #ifdef HAVE_SYS_SYSCALL_H
34 #include <sys/syscall.h>
37 #include <mono/metadata/appdomain.h>
38 #include <mono/metadata/tabledefs.h>
39 #include <mono/metadata/threads.h>
40 #include <mono/metadata/threads-types.h>
41 #include <mono/metadata/debug-helpers.h>
42 #include <mono/metadata/exception.h>
43 #include <mono/metadata/gc-internal.h>
44 #include <mono/metadata/mono-debug.h>
45 #include <mono/metadata/profiler.h>
46 #include <mono/metadata/mono-endian.h>
47 #include <mono/utils/mono-mmap.h>
50 #include "debug-mini.h"
52 #include "debugger-agent.h"
54 #ifndef MONO_ARCH_CONTEXT_DEF
55 #define MONO_ARCH_CONTEXT_DEF
58 static gpointer restore_context_func, call_filter_func;
59 static gpointer throw_exception_func, rethrow_exception_func;
60 static gpointer throw_corlib_exception_func;
62 static gpointer try_more_restore_tramp = NULL;
63 static gpointer restore_stack_protection_tramp = NULL;
65 static void try_more_restore (void);
66 static void restore_stack_protection (void);
69 mono_exceptions_init (void)
72 restore_context_func = mono_aot_get_trampoline ("restore_context");
73 call_filter_func = mono_aot_get_trampoline ("call_filter");
74 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
75 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
79 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
81 mono_save_trampoline_xdebug_info (info);
82 mono_tramp_info_free (info);
84 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
86 mono_save_trampoline_xdebug_info (info);
87 mono_tramp_info_free (info);
89 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
91 mono_save_trampoline_xdebug_info (info);
92 mono_tramp_info_free (info);
94 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
96 mono_save_trampoline_xdebug_info (info);
97 mono_tramp_info_free (info);
100 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
101 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
102 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
105 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
106 mono_arch_exceptions_init ();
111 mono_get_throw_exception (void)
113 g_assert (throw_exception_func);
114 return throw_exception_func;
118 mono_get_rethrow_exception (void)
120 g_assert (rethrow_exception_func);
121 return rethrow_exception_func;
125 mono_get_call_filter (void)
127 g_assert (call_filter_func);
128 return call_filter_func;
132 mono_get_restore_context (void)
134 g_assert (restore_context_func);
135 return restore_context_func;
139 mono_get_throw_corlib_exception (void)
141 gpointer code = NULL;
144 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
145 if (throw_corlib_exception_func)
146 return throw_corlib_exception_func;
149 code = mono_aot_get_trampoline ("throw_corlib_exception");
151 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
153 mono_save_trampoline_xdebug_info (info);
154 mono_tramp_info_free (info);
158 mono_memory_barrier ();
160 throw_corlib_exception_func = code;
162 return throw_corlib_exception_func;
166 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
168 MonoTryBlockHoleTableJitInfo *table;
173 if (ei->try_start > ip || ip >= ei->try_end)
176 if (!ji->has_try_block_holes)
179 table = mono_jit_info_get_try_block_hole_table_info (ji);
180 offset = (guint32)((char*)ip - (char*)ji->code_start);
181 clause = (guint16)(ei - ji->clauses);
182 g_assert (clause < ji->num_clauses);
184 for (i = 0; i < table->num_holes; ++i) {
185 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
186 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
195 * Translate between the mono_arch_find_jit_info function and the old API.
198 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
199 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
201 StackFrameInfo frame;
204 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
206 /* Avoid costly table lookup during stack overflow */
207 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
210 ji = mini_jit_info_table_find (domain, ip, NULL);
215 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
219 /* Convert between the new and the old APIs */
220 switch (frame.type) {
221 case FRAME_TYPE_MANAGED:
225 case FRAME_TYPE_MANAGED_TO_NATIVE:
229 memset (res, 0, sizeof (MonoJitInfo));
230 res->method = frame.method;
233 case FRAME_TYPE_DEBUGGER_INVOKE: {
237 * The normal exception handling code can't handle this frame, so just
240 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
241 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
245 g_assert_not_reached ();
250 /* mono_find_jit_info:
252 * This function is used to gather information from @ctx. It return the
253 * MonoJitInfo of the corresponding function, unwinds one stack frame and
254 * stores the resulting context into @new_ctx. It also stores a string
255 * describing the stack location into @trace (if not NULL), and modifies
256 * the @lmf if necessary. @native_offset return the IP offset from the
257 * start of the function or -1 if that info is not available.
260 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
261 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
265 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
277 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
279 if (ji == (gpointer)-1)
282 if (managed2 || (ji && ji->method->wrapper_type)) {
283 const char *real_ip, *start;
286 start = (const char *)ji->code_start;
288 /* ctx->ip points into native code */
289 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
291 real_ip = (const char*)ip;
293 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
294 offset = real_ip - start;
299 *native_offset = offset;
302 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
306 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
309 char *fname = mono_method_full_name (res->method, TRUE);
310 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
319 * mono_find_jit_info_ext:
321 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
323 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
324 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
325 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
326 * to obtain the last managed frame.
327 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
328 * On return, it will be filled with the locations where callee saved registers are saved
329 * by the current frame. This is returned outside of StackFrameInfo because it can be
330 * quite large on some platforms.
333 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
334 MonoJitInfo *prev_ji, MonoContext *ctx,
335 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
336 mgreg_t **save_locations,
337 StackFrameInfo *frame)
340 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
342 MonoDomain *target_domain;
347 /* Avoid costly table lookup during stack overflow */
348 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
351 ji = mini_jit_info_table_find (domain, ip, &target_domain);
354 target_domain = domain;
357 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
359 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
363 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
365 * This type of frame is just a marker, the caller should unwind once more to get the
366 * last managed frame.
369 frame->method = NULL;
372 frame->native_offset = -1;
373 frame->domain = target_domain;
377 if (frame->type == FRAME_TYPE_MANAGED)
378 frame->method = ji->method;
380 if (ji && (frame->managed || ji->method->wrapper_type)) {
381 const char *real_ip, *start;
383 start = (const char *)ji->code_start;
385 /* ctx->ip points into native code */
386 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
388 real_ip = (const char*)ip;
390 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
391 frame->native_offset = real_ip - start;
393 frame->native_offset = -1;
396 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
398 if (trace && frame->method) {
399 char *fname = mono_method_full_name (frame->method, TRUE);
400 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
409 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
411 MonoGenericJitInfo *gi;
414 if (!ji->has_generic_jit_info)
416 gi = mono_jit_info_get_generic_jit_info (ji);
421 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
423 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
425 if (mono_method_get_context (ji->method)->method_inst) {
427 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
430 /* Avoid returning a managed object */
431 MonoObject *this_obj = info;
433 return this_obj->vtable->klass;
437 static MonoGenericContext
438 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
440 MonoGenericContext context = { NULL, NULL };
441 MonoClass *class, *method_container_class;
443 g_assert (generic_info);
445 g_assert (ji->method->is_inflated);
446 if (mono_method_get_context (ji->method)->method_inst) {
447 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
449 class = mrgctx->class_vtable->klass;
450 context.method_inst = mrgctx->method_inst;
451 g_assert (context.method_inst);
452 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
453 MonoVTable *vtable = generic_info;
455 class = vtable->klass;
457 class = generic_info;
460 //g_assert (!ji->method->klass->generic_container);
461 if (ji->method->klass->generic_class)
462 method_container_class = ji->method->klass->generic_class->container_class;
464 method_container_class = ji->method->klass;
466 /* class might refer to a subclass of ji->method's class */
467 while (!(class == ji->method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
468 class = class->parent;
472 if (class->generic_class || class->generic_container)
473 context.class_inst = mini_class_get_context (class)->class_inst;
475 if (class->generic_class)
476 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
478 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
484 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
486 MonoGenericContext context;
489 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
491 context = get_generic_context_from_stack_frame (ji, generic_info);
493 method = mono_method_get_declaring_generic_method (ji->method);
494 method = mono_class_inflate_generic_method (method, &context);
500 ves_icall_System_Exception_get_trace (MonoException *ex)
502 MonoDomain *domain = mono_domain_get ();
504 MonoArray *ta = ex->trace_ips;
509 /* Exception is not thrown yet */
512 len = mono_array_length (ta) >> 1;
513 trace_str = g_string_new ("");
514 for (i = 0; i < len; i++) {
516 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
517 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
519 ji = mono_jit_info_table_find (domain, ip);
521 /* Unmanaged frame */
522 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
526 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
528 address = (char *)ip - (char *)ji->code_start;
529 location = mono_debug_print_stack_frame (
530 method, address, ex->object.vtable->domain);
532 g_string_append_printf (trace_str, "%s\n", location);
537 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
538 g_string_free (trace_str, TRUE);
544 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
546 MonoDomain *domain = mono_domain_get ();
548 MonoArray *ta = exc->trace_ips;
549 MonoDebugSourceLocation *location;
553 /* Exception is not thrown yet */
554 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
557 len = mono_array_length (ta) >> 1;
559 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
561 for (i = skip; i < len; i++) {
563 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
564 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
565 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
568 ji = mono_jit_info_table_find (domain, ip);
570 /* Unmanaged frame */
571 mono_array_setref (res, i, sf);
575 g_assert (ji != NULL);
577 method = get_method_from_stack_frame (ji, generic_info);
578 if (ji->method->wrapper_type) {
582 s = mono_method_full_name (method, TRUE);
583 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
587 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
588 sf->native_offset = (char *)ip - (char *)ji->code_start;
591 * mono_debug_lookup_source_location() returns both the file / line number information
592 * and the IL offset. Note that computing the IL offset is already an expensive
593 * operation, so we shouldn't call this method twice.
595 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
597 sf->il_offset = location->il_offset;
601 if (need_file_info) {
602 if (location && location->source_file) {
603 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
604 sf->line = location->row;
605 sf->column = location->column;
607 sf->line = sf->column = 0;
612 mono_debug_free_source_location (location);
613 mono_array_setref (res, i, sf);
625 stack_walk_adapter (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
627 StackWalkUserData *d = data;
629 switch (frame->type) {
630 case FRAME_TYPE_DEBUGGER_INVOKE:
631 case FRAME_TYPE_MANAGED_TO_NATIVE:
633 case FRAME_TYPE_MANAGED:
634 g_assert (frame->ji);
635 return d->func (frame->ji->method, frame->native_offset, frame->il_offset, frame->managed, d->user_data);
638 g_assert_not_reached ();
644 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, gpointer user_data)
649 d.user_data = user_data;
651 mono_walk_stack (stack_walk_adapter, mono_domain_get (), start_ctx, unwind_options, mono_thread_internal_current (), mono_get_lmf (), &d);
655 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
657 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
658 MonoUnwindOptions unwind_options = do_il_offset ? MONO_UNWIND_LOOKUP_ALL : MONO_UNWIND_DEFAULT;
659 if (jit_tls && jit_tls->orig_ex_ctx_set)
660 mono_jit_walk_stack_from_ctx (func, &jit_tls->orig_ex_ctx, unwind_options, user_data);
662 mono_jit_walk_stack_from_ctx (func, NULL, unwind_options, user_data);
667 * @func: callback to call for each stack frame
668 * @domain: starting appdomain, can be NULL to use the current domain
669 * @unwind_options: what extra information the unwinder should gather
670 * @start_ctx: starting state of the stack walk, can be NULL.
671 * @thread: the thread whose stack to walk, can be NULL to use the current thread
672 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
673 * @user_data: data passed to the callback
675 * This function walks the stack of a thread, starting from the state
676 * represented by start_ctx. For each frame the callback
677 * function is called with the relevant info. The walk ends when no more
678 * managed stack frames are found or when the callback returns a TRUE value.
681 mono_walk_stack (MonoJitStackWalk func, MonoDomain *domain, MonoContext *start_ctx, MonoUnwindOptions unwind_options, MonoInternalThread *thread, MonoLMF *lmf, gpointer user_data)
683 MonoJitTlsData *jit_tls;
685 MonoContext ctx, new_ctx;
686 StackFrameInfo frame;
689 MONO_ARCH_CONTEXT_DEF
691 mono_arch_flush_register_windows ();
694 thread = mono_thread_internal_current ();
695 lmf = mono_get_lmf ();
698 /* A NULL thread->jit_data can happen in a small window during thread startup: the thread
699 * allocation happens, we do a stack walk (for example with
700 * --profile=log:nocalls and xsp) but the jit is not fully setup for the thread
701 * yet. Of course there are no stack frames, so just returning is ok.
702 * A NULL thread can happen during domain unload with the same test.
704 if (!thread || !thread->jit_data)
706 jit_tls = thread->jit_data;
709 memcpy (&ctx, start_ctx, sizeof (MonoContext));
711 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
712 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
714 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
716 g_assert (thread == mono_thread_internal_current ());
719 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
721 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
725 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
726 MonoDebugSourceLocation *source;
728 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
729 il_offset = source ? source->il_offset : -1;
730 mono_debug_free_source_location (source);
734 frame.il_offset = il_offset;
736 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
737 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
739 frame.actual_method = frame.method;
742 if (func (&frame, &ctx, user_data))
750 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
751 MonoReflectionMethod **method,
752 gint32 *iloffset, gint32 *native_offset,
753 MonoString **file, gint32 *line, gint32 *column)
755 MonoDomain *domain = mono_domain_get ();
756 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
757 MonoLMF *lmf = mono_get_lmf ();
758 MonoJitInfo *ji = NULL;
759 MonoContext ctx, new_ctx;
760 MonoDebugSourceLocation *location;
761 MonoMethod *actual_method;
762 StackFrameInfo frame;
765 MONO_ARCH_CONTEXT_DEF;
767 mono_arch_flush_register_windows ();
769 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
770 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
772 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
778 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
782 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
786 *native_offset = frame.native_offset;
788 /* skip all wrappers ??*/
789 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
790 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
791 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
792 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
793 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
794 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
800 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
802 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
804 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
806 *iloffset = location->il_offset;
810 if (need_file_info) {
812 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
813 *line = location->row;
814 *column = location->column;
821 mono_debug_free_source_location (location);
828 MonoSecurityFrame *frame;
829 } MonoFrameSecurityInfo;
832 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
834 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
835 MonoJitInfo *ji = frame->ji;
840 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
841 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
842 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
843 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
844 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
845 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
854 si->frame = mono_declsec_create_frame (frame->domain, ji);
856 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
861 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
862 * @skip: the number of stack frames to skip
864 * This function returns a the security informations of a single stack frame
865 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
866 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
870 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
872 MonoDomain *domain = mono_domain_get ();
873 MonoFrameSecurityInfo si;
878 mono_walk_stack (callback_get_first_frame_security_info, domain, NULL, MONO_UNWIND_DEFAULT, NULL, NULL, &si);
880 return (si.skips == 0) ? si.frame : NULL;
892 grow_array (MonoSecurityStack *stack)
894 MonoDomain *domain = mono_domain_get ();
895 guint32 newsize = (stack->maximum << 1);
896 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
898 for (i=0; i < stack->maximum; i++) {
899 gpointer frame = mono_array_get (stack->stack, gpointer, i);
900 mono_array_setref (newstack, i, frame);
902 stack->maximum = newsize;
903 stack->stack = newstack;
907 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
909 MonoSecurityStack *ss = (MonoSecurityStack*) data;
910 MonoJitInfo *ji = frame->ji;
915 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
916 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
917 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
918 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
919 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
920 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
929 if (ss->count == ss->maximum)
932 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
934 /* continue down the stack */
939 glist_to_array (GList *list, MonoClass *eclass)
941 MonoDomain *domain = mono_domain_get ();
948 len = g_list_length (list);
949 res = mono_array_new (domain, eclass, len);
951 for (i = 0; list; list = list->next, i++)
952 mono_array_set (res, gpointer, i, list->data);
958 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
959 * @skip: the number of stack frames to skip
961 * This function returns an managed array of containing the security
962 * informations for each frame (after the skipped ones). This is used for
963 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
967 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
969 MonoDomain *domain = mono_domain_get ();
970 MonoSecurityStack ss;
972 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
978 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
979 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
980 mono_walk_stack (callback_get_stack_frames_security_info, domain, NULL, MONO_UNWIND_DEFAULT, NULL, NULL, &ss);
981 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
986 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
988 MonoClass *catch_class = ei->data.catch_class;
989 MonoType *inflated_type;
990 MonoGenericContext context;
992 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
993 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
996 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
998 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1000 /* FIXME: we shouldn't inflate but instead put the
1001 type in the rgctx and fetch it from there. It
1002 might be a good idea to do this lazily, i.e. only
1003 when the exception is actually thrown, so as not to
1004 waste space for exception clauses which might never
1006 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1007 catch_class = mono_class_from_mono_type (inflated_type);
1008 mono_metadata_free_type (inflated_type);
1014 * mini_jit_info_table_find:
1016 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1017 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1018 * OUT_DOMAIN if it is not NULL.
1021 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1024 MonoInternalThread *t = mono_thread_internal_current ();
1030 ji = mono_jit_info_table_find (domain, addr);
1033 *out_domain = domain;
1037 /* maybe it is shared code, so we also search in the root domain */
1038 if (domain != mono_get_root_domain ()) {
1039 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1042 *out_domain = mono_get_root_domain ();
1047 for (l = t->appdomain_refs; l; l = l->next) {
1048 if (l->data != domain) {
1049 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1052 *out_domain = (MonoDomain*)l->data;
1062 * wrap_non_exception_throws:
1064 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1065 * WrapNonExceptionThrows flag set.
1068 wrap_non_exception_throws (MonoMethod *m)
1070 MonoAssembly *ass = m->klass->image->assembly;
1071 MonoCustomAttrInfo* attrs;
1072 static MonoClass *klass;
1074 gboolean val = FALSE;
1077 if (ass->wrap_non_exception_throws_inited)
1078 return ass->wrap_non_exception_throws;
1080 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1082 attrs = mono_custom_attrs_from_assembly (ass);
1084 for (i = 0; i < attrs->num_attrs; ++i) {
1085 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1087 int len, num_named, named_type, data_type, name_len;
1090 if (!attr->ctor || attr->ctor->klass != klass)
1092 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1093 len = attr->data_size;
1094 p = (const char*)attr->data;
1095 g_assert (read16 (p) == 0x0001);
1097 num_named = read16 (p);
1106 if (named_type != 0x54)
1108 name_len = mono_metadata_decode_blob_size (p, &p);
1109 name = g_malloc (name_len + 1);
1110 memcpy (name, p, name_len);
1111 name [name_len] = 0;
1113 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1115 /* The value is a BOOLEAN */
1118 mono_custom_attrs_free (attrs);
1121 ass->wrap_non_exception_throws = val;
1122 mono_memory_barrier ();
1123 ass->wrap_non_exception_throws_inited = TRUE;
1128 #ifndef MONO_ARCH_STACK_GROWS_UP
1129 #define DOES_STACK_GROWS_UP 1
1131 #define DOES_STACK_GROWS_UP 0
1135 * mono_handle_exception_internal_first_pass:
1137 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1138 * OBJ is found. Run the index of the filter clause which caught the exception into
1139 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1142 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gpointer original_ip, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoObject *non_exception)
1144 MonoDomain *domain = mono_domain_get ();
1146 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1147 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1148 MonoLMF *lmf = mono_get_lmf ();
1149 MonoArray *initial_trace_ips = NULL;
1150 GList *trace_ips = NULL;
1151 MonoException *mono_ex;
1152 gboolean stack_overflow = FALSE;
1153 MonoContext initial_ctx;
1154 int frame_count = 0;
1155 gboolean has_dynamic_methods = FALSE;
1160 g_assert (ctx != NULL);
1162 if (obj == domain->stack_overflow_ex)
1163 stack_overflow = TRUE;
1165 mono_ex = (MonoException*)obj;
1166 initial_trace_ips = mono_ex->trace_ips;
1168 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1169 mono_ex = (MonoException*)obj;
1170 initial_trace_ips = mono_ex->trace_ips;
1176 call_filter = mono_get_call_filter ();
1178 g_assert (jit_tls->end_of_stack);
1179 g_assert (jit_tls->abort_func);
1182 *out_filter_idx = -1;
1189 MonoContext new_ctx;
1191 int clause_index_start = 0;
1192 gboolean unwind_res = TRUE;
1194 StackFrameInfo frame;
1196 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1198 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1202 g_assert (frame.type == FRAME_TYPE_MANAGED);
1207 if (mono_ex && !initial_trace_ips) {
1208 trace_ips = g_list_reverse (trace_ips);
1209 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1210 if (has_dynamic_methods)
1211 /* These methods could go away anytime, so compute the stack trace now */
1212 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1214 g_list_free (trace_ips);
1219 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1221 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1222 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1223 "The native frame called the managed method:\n%s\n",
1224 mono_method_full_name (ji->method, TRUE));
1227 if (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1229 * Avoid overwriting the stack trace if the exception is
1230 * rethrown. Also avoid giant stack traces during a stack
1233 if (!initial_trace_ips && (frame_count < 1000)) {
1234 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1235 trace_ips = g_list_prepend (trace_ips,
1236 get_generic_info_from_stack_frame (ji, ctx));
1240 if (ji->method->dynamic)
1241 has_dynamic_methods = TRUE;
1243 if (stack_overflow) {
1244 if (DOES_STACK_GROWS_UP)
1245 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1247 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1249 free_stack = 0xffffff;
1252 for (i = clause_index_start; i < ji->num_clauses; i++) {
1253 MonoJitExceptionInfo *ei = &ji->clauses [i];
1254 gboolean filtered = FALSE;
1257 * During stack overflow, wait till the unwinding frees some stack
1258 * space before running handlers/finalizers.
1260 if (free_stack <= (64 * 1024))
1263 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1265 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1268 * Have to unwrap RuntimeWrappedExceptions if the
1269 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1271 if (non_exception && !wrap_non_exception_throws (ji->method))
1272 ex_obj = non_exception;
1276 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1277 mono_perfcounters->exceptions_filters++;
1278 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1279 if (mono_ex && !initial_trace_ips) {
1280 trace_ips = g_list_reverse (trace_ips);
1281 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1283 if (has_dynamic_methods)
1284 /* These methods could go away anytime, so compute the stack trace now */
1285 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1287 g_list_free (trace_ips);
1290 if (ji->from_llvm) {
1291 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1292 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1294 g_assert_not_reached ();
1297 /* store the exception object in bp + ei->exvar_offset */
1298 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1301 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1302 filtered = call_filter (ctx, ei->data.filter);
1303 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1304 if (filtered && out_filter_idx)
1305 *out_filter_idx = filter_idx;
1311 /* mono_debugger_agent_handle_exception () needs this */
1312 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1317 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1318 if (mono_ex && !initial_trace_ips) {
1319 trace_ips = g_list_reverse (trace_ips);
1320 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1321 if (has_dynamic_methods)
1322 /* These methods could go away anytime, so compute the stack trace now */
1323 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1325 g_list_free (trace_ips);
1327 /* mono_debugger_agent_handle_exception () needs this */
1328 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1337 g_assert_not_reached ();
1341 * mono_handle_exception_internal:
1342 * @ctx: saved processor state
1343 * @obj: the exception object
1344 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1347 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean resume, MonoJitInfo **out_ji)
1349 MonoDomain *domain = mono_domain_get ();
1351 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1352 static void (*restore_context) (void *);
1353 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1354 MonoLMF *lmf = mono_get_lmf ();
1355 MonoException *mono_ex;
1356 gboolean stack_overflow = FALSE;
1357 MonoContext initial_ctx;
1358 int frame_count = 0;
1359 gint32 filter_idx, first_filter_idx;
1362 MonoObject *non_exception = NULL;
1364 g_assert (ctx != NULL);
1366 MonoException *ex = mono_get_exception_null_reference ();
1367 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1368 obj = (MonoObject *)ex;
1372 * Allocate a new exception object instead of the preconstructed ones.
1374 if (obj == domain->stack_overflow_ex) {
1376 * It is not a good idea to try and put even more pressure on the little stack available.
1377 * obj = mono_get_exception_stack_overflow ();
1379 stack_overflow = TRUE;
1381 else if (obj == domain->null_reference_ex) {
1382 obj = mono_get_exception_null_reference ();
1385 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1386 non_exception = obj;
1387 obj = mono_get_exception_runtime_wrapped (obj);
1390 mono_ex = (MonoException*)obj;
1392 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1393 mono_ex = (MonoException*)obj;
1398 if (mono_ex && jit_tls->class_cast_from) {
1399 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1400 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1401 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1402 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1403 mono_ex->message = mono_string_new (domain, msg);
1408 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1409 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1410 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1411 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1412 mono_ex->message = mono_string_new (domain, msg);
1420 call_filter = mono_get_call_filter ();
1422 if (!restore_context)
1423 restore_context = mono_get_restore_context ();
1425 g_assert (jit_tls->end_of_stack);
1426 g_assert (jit_tls->abort_func);
1429 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1430 * end up being TRUE on any code path.
1432 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1437 MonoContext ctx_cp = *ctx;
1438 if (mono_trace_is_enabled ()) {
1439 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1440 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1441 MonoObject *message;
1442 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1444 MonoObject *exc = NULL;
1445 if (get_message == NULL) {
1447 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1449 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1451 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1455 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1457 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1459 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1460 mono_print_thread_dump_from_ctx (ctx);
1462 jit_tls->orig_ex_ctx_set = TRUE;
1463 mono_profiler_exception_thrown (obj);
1464 jit_tls->orig_ex_ctx_set = FALSE;
1466 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, original_ip, &first_filter_idx, out_ji, non_exception);
1469 if (mono_break_on_exc)
1471 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1472 // FIXME: This runs managed code so it might cause another stack overflow when
1473 // we are handling a stack overflow
1474 mono_unhandled_exception (obj);
1476 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1486 MonoContext new_ctx;
1488 int clause_index_start = 0;
1489 gboolean unwind_res = TRUE;
1493 ji = jit_tls->resume_state.ji;
1494 new_ctx = jit_tls->resume_state.new_ctx;
1495 clause_index_start = jit_tls->resume_state.clause_index;
1496 lmf = jit_tls->resume_state.lmf;
1497 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1498 filter_idx = jit_tls->resume_state.filter_idx;
1500 StackFrameInfo frame;
1502 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1504 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1508 g_assert (frame.type == FRAME_TYPE_MANAGED);
1514 *(mono_get_lmf_addr ()) = lmf;
1516 jit_tls->abort_func (obj);
1517 g_assert_not_reached ();
1521 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1523 if (stack_overflow) {
1524 if (DOES_STACK_GROWS_UP)
1525 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1527 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1529 free_stack = 0xffffff;
1532 for (i = clause_index_start; i < ji->num_clauses; i++) {
1533 MonoJitExceptionInfo *ei = &ji->clauses [i];
1534 gboolean filtered = FALSE;
1537 * During stack overflow, wait till the unwinding frees some stack
1538 * space before running handlers/finalizers.
1540 if (free_stack <= (64 * 1024))
1543 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1545 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1548 * Have to unwrap RuntimeWrappedExceptions if the
1549 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1551 if (non_exception && !wrap_non_exception_throws (ji->method))
1552 ex_obj = non_exception;
1556 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1557 if (ji->from_llvm) {
1558 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1559 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1561 g_assert_not_reached ();
1564 /* store the exception object in bp + ei->exvar_offset */
1565 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1569 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1571 * Filter clauses should only be run in the
1572 * first pass of exception handling.
1574 filtered = (filter_idx == first_filter_idx);
1578 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1579 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1581 * This guards against the situation that we abort a thread that is executing a finally clause
1582 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1583 * check for this situation here and resume interruption if we are below the guarded block.
1585 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1586 gboolean is_outside = FALSE;
1587 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1588 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1589 //FIXME make this stack direction aware
1590 if (catch_bp > prot_bp) {
1592 } else if (catch_bp == prot_bp) {
1593 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1594 * So we check if the catch handler_start is protected by the guarded handler protected region
1597 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1598 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1599 * There aren't any further finally/fault handler blocks down the stack over this exception.
1600 * This must be ensured by the code that installs the guard trampoline.
1602 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1604 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1609 jit_tls->handler_block_return_address = NULL;
1610 jit_tls->handler_block = NULL;
1611 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1615 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1616 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1617 jit_tls->orig_ex_ctx_set = TRUE;
1618 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1619 jit_tls->orig_ex_ctx_set = FALSE;
1620 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1621 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1622 *(mono_get_lmf_addr ()) = lmf;
1623 mono_perfcounters->exceptions_depth += frame_count;
1624 if (obj == domain->stack_overflow_ex)
1625 jit_tls->handling_stack_ovf = FALSE;
1629 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1630 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1631 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1632 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1633 jit_tls->orig_ex_ctx_set = TRUE;
1634 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1635 jit_tls->orig_ex_ctx_set = FALSE;
1636 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1637 call_filter (ctx, ei->handler_start);
1639 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1640 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1641 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1642 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1643 jit_tls->orig_ex_ctx_set = TRUE;
1644 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1645 jit_tls->orig_ex_ctx_set = FALSE;
1646 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1647 mono_perfcounters->exceptions_finallys++;
1648 *(mono_get_lmf_addr ()) = lmf;
1649 if (ji->from_llvm) {
1651 * LLVM compiled finally handlers follow the design
1652 * of the c++ ehabi, i.e. they call a resume function
1653 * at the end instead of returning to the caller.
1654 * So save the exception handling state,
1655 * mono_resume_unwind () will call us again to continue
1658 jit_tls->resume_state.ex_obj = obj;
1659 jit_tls->resume_state.ji = ji;
1660 jit_tls->resume_state.clause_index = i + 1;
1661 jit_tls->resume_state.ctx = *ctx;
1662 jit_tls->resume_state.new_ctx = new_ctx;
1663 jit_tls->resume_state.lmf = lmf;
1664 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1665 jit_tls->resume_state.filter_idx = filter_idx;
1666 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1669 call_filter (ctx, ei->handler_start);
1675 jit_tls->orig_ex_ctx_set = TRUE;
1676 mono_profiler_exception_method_leave (ji->method);
1677 jit_tls->orig_ex_ctx_set = FALSE;
1682 g_assert_not_reached ();
1686 * mono_debugger_handle_exception:
1688 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1689 * at the exception and FALSE to resume with the normal exception handling.
1691 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1692 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1693 * `callq throw' instruction.
1696 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1698 MonoDebuggerExceptionAction action;
1700 if (!mono_debug_using_mono_debugger ())
1704 MonoException *ex = mono_get_exception_null_reference ();
1705 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1706 obj = (MonoObject *)ex;
1709 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1711 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1713 * The debugger wants us to stop on the `throw' instruction.
1714 * By the time we get here, it already inserted a breakpoint there.
1717 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1718 MonoContext ctx_cp = *ctx;
1719 MonoJitInfo *ji = NULL;
1723 * The debugger wants us to stop only if this exception is user-unhandled.
1726 ret = mono_handle_exception_internal_first_pass (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), NULL, &ji, NULL);
1727 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1729 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1730 * inside the method being invoked, so we handle it like a user-unhandled exception.
1737 * The exception is user-unhandled - tell the debugger to stop.
1739 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1743 * The exception is catched somewhere - resume with the normal exception handling and don't
1744 * stop in the debugger.
1752 * mono_debugger_run_finally:
1753 * @start_ctx: saved processor state
1755 * This method is called by the Mono Debugger to call all `finally' clauses of the
1756 * current stack frame. It's used when the user issues a `return' command to make
1757 * the current stack frame return. After returning from this method, the debugger
1758 * unwinds the stack one frame and gives control back to the user.
1760 * NOTE: This method is only used when running inside the Mono Debugger.
1763 mono_debugger_run_finally (MonoContext *start_ctx)
1765 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1766 MonoDomain *domain = mono_domain_get ();
1767 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1768 MonoLMF *lmf = mono_get_lmf ();
1769 MonoContext ctx, new_ctx;
1770 MonoJitInfo *ji, rji;
1775 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1776 if (!ji || ji == (gpointer)-1)
1780 call_filter = mono_get_call_filter ();
1782 for (i = 0; i < ji->num_clauses; i++) {
1783 MonoJitExceptionInfo *ei = &ji->clauses [i];
1785 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1786 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1787 call_filter (&ctx, ei->handler_start);
1793 * mono_handle_exception:
1794 * @ctx: saved processor state
1795 * @obj: the exception object
1796 * @test_only: only test if the exception is caught, but dont call handlers
1799 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1802 mono_perfcounters->exceptions_thrown++;
1804 g_assert (!test_only);
1805 return mono_handle_exception_internal (ctx, obj, original_ip, FALSE, NULL);
1808 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1810 #ifndef MONO_ARCH_USE_SIGACTION
1811 #error "Can't use sigaltstack without sigaction"
1814 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1817 mono_setup_altstack (MonoJitTlsData *tls)
1820 struct sigaltstack sa;
1821 guint8 *staddr = NULL;
1823 if (mono_running_on_valgrind ())
1826 mono_thread_get_stack_bounds (&staddr, &stsize);
1830 tls->end_of_stack = staddr + stsize;
1831 tls->stack_size = stsize;
1833 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1835 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1836 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1838 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1840 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1841 /* mprotect can fail for the main thread stack */
1842 gpointer gaddr = mono_valloc (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON|MONO_MMAP_FIXED);
1843 g_assert (gaddr == tls->stack_ovf_guard_base);
1844 tls->stack_ovf_valloced = TRUE;
1847 /* Setup an alternate signal stack */
1848 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1849 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1851 g_assert (tls->signal_stack);
1853 sa.ss_sp = tls->signal_stack;
1854 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1855 sa.ss_flags = SS_ONSTACK;
1856 sigaltstack (&sa, NULL);
1860 mono_free_altstack (MonoJitTlsData *tls)
1862 struct sigaltstack sa;
1865 sa.ss_sp = tls->signal_stack;
1866 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1867 sa.ss_flags = SS_DISABLE;
1868 err = sigaltstack (&sa, NULL);
1869 g_assert (err == 0);
1871 if (tls->signal_stack)
1872 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1873 if (tls->stack_ovf_valloced)
1874 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1876 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1879 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1882 mono_setup_altstack (MonoJitTlsData *tls)
1887 mono_free_altstack (MonoJitTlsData *tls)
1891 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1894 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1896 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1897 /* we need to leave some room for throwing the exception */
1898 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1899 unprotect_size -= mono_pagesize ();
1900 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1901 * is sufficient stack
1903 //fprintf (stderr, "restoring stack protection: %p-%p (%d)\n", jit_tls->stack_ovf_guard_base, (char*)jit_tls->stack_ovf_guard_base + unprotect_size, unprotect_size);
1905 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1906 return unprotect_size == jit_tls->stack_ovf_guard_size;
1910 try_more_restore (void)
1912 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1913 if (try_restore_stack_protection (jit_tls, 500))
1914 jit_tls->restore_stack_prot = NULL;
1918 restore_stack_protection (void)
1920 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1921 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1922 /* if we can't restore the stack protection, keep a callback installed so
1923 * we'll try to restore as much stack as we can at each return from unmanaged
1926 if (try_restore_stack_protection (jit_tls, 4096))
1927 jit_tls->restore_stack_prot = NULL;
1929 jit_tls->restore_stack_prot = try_more_restore_tramp;
1930 /* here we also throw a stack overflow exception */
1931 ex->trace_ips = NULL;
1932 ex->stack_trace = NULL;
1933 mono_raise_exception (ex);
1937 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1939 void (*func)(void) = (gpointer)tramp_data;
1945 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1947 /* we got a stack overflow in the soft-guard pages
1948 * There are two cases:
1949 * 1) managed code caused the overflow: we unprotect the soft-guard page
1950 * and let the arch-specific code trigger the exception handling mechanism
1951 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1952 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1953 * and hope we can continue with those enabled, at least until the hard-guard page
1954 * is hit. The alternative to continuing here is to just print a message and abort.
1955 * We may add in the future the code to protect the pages again in the codepath
1956 * when we return from unmanaged to managed code.
1958 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1959 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1960 /* we unprotect the minimum amount we can */
1962 gboolean handled = FALSE;
1964 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1965 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1966 guard_size -= mono_pagesize ();
1968 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1969 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1970 mono_mprotect ((char*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size - guard_size, guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1971 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1973 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1978 /* We print a message: after this even managed stack overflows
1979 * may crash the runtime
1981 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1982 if (!jit_tls->handling_stack_ovf) {
1983 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1984 jit_tls->handling_stack_ovf = 1;
1986 /*fprintf (stderr, "Already handling stack overflow\n");*/
1995 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1997 FILE *stream = (FILE*)data;
2000 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
2001 fprintf (stream, " %s\n", location);
2004 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
2009 static G_GNUC_UNUSED gboolean
2010 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
2013 GString *p = (GString*)data;
2016 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
2017 g_string_append_printf (p, " %s\n", location);
2020 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
2025 static gboolean handling_sigsegv = FALSE;
2028 * mono_handle_native_sigsegv:
2030 * Handle a SIGSEGV received while in native code by printing diagnostic
2031 * information and aborting.
2034 mono_handle_native_sigsegv (int signal, void *ctx)
2036 #ifdef MONO_ARCH_USE_SIGACTION
2037 struct sigaction sa;
2039 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2041 if (handling_sigsegv)
2044 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2045 fprintf (stderr, "Received SIGSEGV, suspending...");
2050 /* To prevent infinite loops when the stack walk causes a crash */
2051 handling_sigsegv = TRUE;
2053 /* !jit_tls means the thread was not registered with the runtime */
2054 if (jit_tls && mono_thread_internal_current ()) {
2055 fprintf (stderr, "Stacktrace:\n\n");
2057 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
2062 #ifdef HAVE_BACKTRACE_SYMBOLS
2067 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2069 fprintf (stderr, "\nNative stacktrace:\n\n");
2071 size = backtrace (array, 256);
2072 names = backtrace_symbols (array, size);
2073 for (i =0; i < size; ++i) {
2074 fprintf (stderr, "\t%s\n", names [i]);
2080 /* Try to get more meaningful information using gdb */
2082 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2083 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
2084 /* From g_spawn_command_line_sync () in eglib */
2086 int stdout_pipe [2] = { -1, -1 };
2091 res = pipe (stdout_pipe);
2092 g_assert (res != -1);
2096 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2097 * it will deadlock. Call the syscall directly instead.
2099 pid = mono_runtime_syscall_fork ();
2102 close (stdout_pipe [0]);
2103 dup2 (stdout_pipe [1], STDOUT_FILENO);
2105 for (i = getdtablesize () - 1; i >= 3; i--)
2108 if (!mono_gdb_render_native_backtraces ())
2109 close (STDOUT_FILENO);
2114 close (stdout_pipe [1]);
2116 fprintf (stderr, "\nDebug info from gdb:\n\n");
2119 int nread = read (stdout_pipe [0], buffer, 1024);
2123 write (STDERR_FILENO, buffer, nread);
2126 waitpid (pid, &status, WNOHANG);
2130 * A SIGSEGV indicates something went very wrong so we can no longer depend
2131 * on anything working. So try to print out lots of diagnostics, starting
2132 * with ones which have a greater chance of working.
2136 "=================================================================\n"
2137 "Got a %s while executing native code. This usually indicates\n"
2138 "a fatal error in the mono runtime or one of the native libraries \n"
2139 "used by your application.\n"
2140 "=================================================================\n"
2146 #ifdef MONO_ARCH_USE_SIGACTION
2148 /* Remove our SIGABRT handler */
2149 sa.sa_handler = SIG_DFL;
2150 sigemptyset (&sa.sa_mask);
2153 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2161 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2163 MonoInternalThread *thread = mono_thread_internal_current ();
2164 #if defined(__i386__) || defined(__x86_64__)
2167 GString* text = g_string_new (0);
2168 char *name, *wapi_desc;
2169 GError *error = NULL;
2172 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2174 g_string_append_printf (text, "\n\"%s\"", name);
2177 else if (thread->threadpool_thread)
2178 g_string_append (text, "\n\"<threadpool thread>\"");
2180 g_string_append (text, "\n\"<unnamed thread>\"");
2183 wapi_desc = wapi_current_thread_desc ();
2184 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2188 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2190 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2192 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2194 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2196 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2198 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2201 fprintf (stdout, "%s", text->str);
2202 g_string_free (text, TRUE);
2207 * mono_print_thread_dump:
2209 * Print information about the current thread to stdout.
2210 * SIGCTX can be NULL, allowing this to be called from gdb.
2213 mono_print_thread_dump (void *sigctx)
2215 mono_print_thread_dump_internal (sigctx, NULL);
2219 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2221 mono_print_thread_dump_internal (NULL, ctx);
2225 * mono_resume_unwind:
2227 * This is called by a trampoline from LLVM compiled finally clauses to continue
2231 mono_resume_unwind (MonoContext *ctx)
2233 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2234 static void (*restore_context) (MonoContext *);
2235 MonoContext new_ctx;
2237 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2238 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2241 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, NULL, TRUE, NULL);
2243 if (!restore_context)
2244 restore_context = mono_get_restore_context ();
2246 restore_context (&new_ctx);
2249 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2254 MonoJitExceptionInfo *ei;
2255 } FindHandlerBlockData;
2258 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2262 FindHandlerBlockData *pdata = data;
2263 MonoJitInfo *ji = frame->ji;
2268 if (ji->method->wrapper_type)
2271 ip = MONO_CONTEXT_GET_IP (ctx);
2273 for (i = 0; i < ji->num_clauses; ++i) {
2274 MonoJitExceptionInfo *ei = ji->clauses + i;
2275 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2277 /*If ip points to the first instruction it means the handler block didn't start
2278 so we can leave its execution to the EH machinery*/
2279 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2291 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2294 MonoJitExceptionInfo *clause = NULL;
2297 ip = MONO_CONTEXT_GET_IP (ctx);
2299 for (i = 0; i < ji->num_clauses; ++i) {
2300 clause = &ji->clauses [i];
2301 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2303 if (clause->handler_start < ip && clause->data.handler_end > ip)
2307 /*no matching finally */
2308 if (i == ji->num_clauses)
2311 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2312 if (ip == clause->handler_start)
2315 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2319 * Finds the bottom handler block running and install a block guard if needed.
2322 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)
2324 FindHandlerBlockData data = { 0 };
2325 MonoDomain *domain = mono_domain_get ();
2326 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2329 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2330 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2332 if (!jit_tls || jit_tls->handler_block_return_address)
2335 mono_walk_stack (find_last_handler_block, domain, ctx, MONO_UNWIND_SIGNAL_SAFE, NULL, NULL, &data);
2340 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2342 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2343 if (resume_ip == NULL)
2346 jit_tls->handler_block_return_address = resume_ip;
2347 jit_tls->handler_block = data.ei;
2350 /*Clear current thread from been wapi interrupted otherwise things can go south*/
2351 wapi_clear_interruption ();
2358 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)