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/utils/mono-mmap.h>
49 #include "debug-mini.h"
52 #ifndef MONO_ARCH_CONTEXT_DEF
53 #define MONO_ARCH_CONTEXT_DEF
56 static gpointer restore_context_func, call_filter_func;
57 static gpointer throw_exception_func, rethrow_exception_func;
58 static gpointer throw_exception_by_name_func, throw_corlib_exception_func;
60 static gpointer try_more_restore_tramp = NULL;
61 static gpointer restore_stack_protection_tramp = NULL;
63 static void try_more_restore (void);
64 static void restore_stack_protection (void);
67 mono_exceptions_init (void)
69 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
74 restore_context_func = mono_aot_get_named_code ("restore_context");
75 call_filter_func = mono_aot_get_named_code ("call_filter");
76 throw_exception_func = mono_aot_get_named_code ("throw_exception");
77 rethrow_exception_func = mono_aot_get_named_code ("rethrow_exception");
79 restore_context_func = mono_arch_get_restore_context_full (&code_size, &ji, FALSE);
80 call_filter_func = mono_arch_get_call_filter_full (&code_size, &ji, FALSE);
81 throw_exception_func = mono_arch_get_throw_exception_full (&code_size, &ji, FALSE);
82 rethrow_exception_func = mono_arch_get_rethrow_exception_full (&code_size, &ji, FALSE);
85 restore_context_func = mono_arch_get_restore_context ();
86 call_filter_func = mono_arch_get_call_filter ();
87 throw_exception_func = mono_arch_get_throw_exception ();
88 rethrow_exception_func = mono_arch_get_rethrow_exception ();
90 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
91 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
92 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
95 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
96 mono_arch_exceptions_init ();
101 mono_get_throw_exception (void)
103 g_assert (throw_exception_func);
104 return throw_exception_func;
108 mono_get_rethrow_exception (void)
110 g_assert (rethrow_exception_func);
111 return rethrow_exception_func;
115 mono_get_call_filter (void)
117 g_assert (call_filter_func);
118 return call_filter_func;
122 mono_get_restore_context (void)
124 g_assert (restore_context_func);
125 return restore_context_func;
129 mono_get_throw_exception_by_name (void)
131 gpointer code = NULL;
132 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
137 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
138 if (throw_exception_by_name_func)
139 return throw_exception_by_name_func;
141 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
143 code = mono_aot_get_named_code ("throw_exception_by_name");
145 code = mono_arch_get_throw_exception_by_name_full (&code_size, &ji, FALSE);
147 code = mono_arch_get_throw_exception_by_name ();
150 mono_memory_barrier ();
152 throw_exception_by_name_func = code;
154 return throw_exception_by_name_func;
158 mono_get_throw_corlib_exception (void)
160 gpointer code = NULL;
161 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
166 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
167 if (throw_corlib_exception_func)
168 return throw_corlib_exception_func;
170 #if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
171 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
173 code = mono_aot_get_named_code ("throw_corlib_exception");
175 code = mono_arch_get_throw_corlib_exception_full (&code_size, &ji, FALSE);
177 code = mono_arch_get_throw_corlib_exception ();
180 g_assert_not_reached ();
183 mono_memory_barrier ();
185 throw_corlib_exception_func = code;
187 return throw_corlib_exception_func;
190 /* mono_find_jit_info:
192 * This function is used to gather information from @ctx. It return the
193 * MonoJitInfo of the corresponding function, unwinds one stack frame and
194 * stores the resulting context into @new_ctx. It also stores a string
195 * describing the stack location into @trace (if not NULL), and modifies
196 * the @lmf if necessary. @native_offset return the IP offset from the
197 * start of the function or -1 if that info is not available.
200 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
201 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
205 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
217 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
219 if (ji == (gpointer)-1)
222 if (managed2 || ji->method->wrapper_type) {
223 const char *real_ip, *start;
226 start = (const char *)ji->code_start;
228 /* ctx->ip points into native code */
229 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
231 real_ip = (const char*)ip;
233 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
234 offset = real_ip - start;
239 *native_offset = offset;
242 if (!ji->method->wrapper_type)
246 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
249 char *fname = mono_method_full_name (res->method, TRUE);
250 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
259 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
261 MonoGenericJitInfo *gi;
264 if (!ji->has_generic_jit_info)
266 gi = mono_jit_info_get_generic_jit_info (ji);
271 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
273 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
275 if (mono_method_get_context (ji->method)->method_inst) {
277 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
280 /* Avoid returning a managed object */
281 MonoObject *this_obj = info;
283 return this_obj->vtable->klass;
287 static MonoGenericContext
288 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
290 MonoGenericContext context = { NULL, NULL };
291 MonoClass *class, *method_container_class;
293 g_assert (generic_info);
295 g_assert (ji->method->is_inflated);
296 if (mono_method_get_context (ji->method)->method_inst) {
297 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
299 class = mrgctx->class_vtable->klass;
300 context.method_inst = mrgctx->method_inst;
301 g_assert (context.method_inst);
302 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
303 MonoVTable *vtable = generic_info;
305 class = vtable->klass;
307 class = generic_info;
310 if (class->generic_class || class->generic_container)
311 context.class_inst = mini_class_get_context (class)->class_inst;
313 g_assert (!ji->method->klass->generic_container);
314 if (ji->method->klass->generic_class)
315 method_container_class = ji->method->klass->generic_class->container_class;
317 method_container_class = ji->method->klass;
319 if (class->generic_class)
320 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
322 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
328 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
330 MonoGenericContext context;
333 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
335 context = get_generic_context_from_stack_frame (ji, generic_info);
337 method = mono_method_get_declaring_generic_method (ji->method);
338 method = mono_class_inflate_generic_method (method, &context);
344 ves_icall_System_Exception_get_trace (MonoException *ex)
346 MonoDomain *domain = mono_domain_get ();
348 MonoArray *ta = ex->trace_ips;
353 /* Exception is not thrown yet */
356 len = mono_array_length (ta) >> 1;
357 trace_str = g_string_new ("");
358 for (i = 0; i < len; i++) {
360 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
361 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
363 ji = mono_jit_info_table_find (domain, ip);
365 /* Unmanaged frame */
366 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
370 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
372 address = (char *)ip - (char *)ji->code_start;
373 location = mono_debug_print_stack_frame (
374 method, address, ex->object.vtable->domain);
376 g_string_append_printf (trace_str, "%s\n", location);
381 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
382 g_string_free (trace_str, TRUE);
388 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
390 MonoDomain *domain = mono_domain_get ();
392 MonoArray *ta = exc->trace_ips;
393 MonoDebugSourceLocation *location;
397 /* Exception is not thrown yet */
398 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
401 len = mono_array_length (ta) >> 1;
403 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
405 for (i = skip; i < len; i++) {
407 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
408 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
409 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
412 ji = mono_jit_info_table_find (domain, ip);
414 /* Unmanaged frame */
415 mono_array_setref (res, i, sf);
419 g_assert (ji != NULL);
421 method = get_method_from_stack_frame (ji, generic_info);
422 if (ji->method->wrapper_type) {
426 s = mono_method_full_name (method, TRUE);
427 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
431 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
432 sf->native_offset = (char *)ip - (char *)ji->code_start;
435 * mono_debug_lookup_source_location() returns both the file / line number information
436 * and the IL offset. Note that computing the IL offset is already an expensive
437 * operation, so we shouldn't call this method twice.
439 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
441 sf->il_offset = location->il_offset;
445 if (need_file_info) {
446 if (location && location->source_file) {
447 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
448 sf->line = location->row;
449 sf->column = location->column;
451 sf->line = sf->column = 0;
456 mono_debug_free_source_location (location);
457 mono_array_setref (res, i, sf);
465 * @domain: starting appdomain
466 * @jit_tls: JIT data for the thread
467 * @start_ctx: starting state of the stack frame
468 * @func: callback to call for each stack frame
469 * @user_data: data passed to the callback
471 * This function walks the stack of a thread, starting from the state
472 * represented by jit_tls and start_ctx. For each frame the callback
473 * function is called with the relevant info. The walk ends when no more
474 * managed stack frames are found or when the callback returns a TRUE value.
475 * Note that the function can be used to walk the stack of a thread
476 * different from the current.
479 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
481 MonoLMF *lmf = mono_get_lmf ();
482 MonoJitInfo *ji, rji;
485 MonoContext ctx, new_ctx;
489 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
491 * FIXME: mono_find_jit_info () will need to be able to return a different
492 * MonoDomain when apddomain transitions are found on the stack.
494 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
495 if (!ji || ji == (gpointer)-1)
498 if (func (domain, &new_ctx, ji, user_data))
506 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
508 MonoDomain *domain = mono_domain_get ();
509 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
510 MonoLMF *lmf = mono_get_lmf ();
511 MonoJitInfo *ji, rji;
512 gint native_offset, il_offset;
514 MonoContext ctx, new_ctx;
516 MONO_ARCH_CONTEXT_DEF
518 mono_arch_flush_register_windows ();
521 memcpy (&ctx, start_ctx, sizeof (MonoContext));
523 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
524 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
526 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
530 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
531 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
534 if (ji == (gpointer)-1)
538 MonoDebugSourceLocation *source;
540 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
541 il_offset = source ? source->il_offset : -1;
542 mono_debug_free_source_location (source);
546 if (func (ji->method, native_offset, il_offset, managed, user_data))
554 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
556 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
560 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
561 MonoReflectionMethod **method,
562 gint32 *iloffset, gint32 *native_offset,
563 MonoString **file, gint32 *line, gint32 *column)
565 MonoDomain *domain = mono_domain_get ();
566 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
567 MonoLMF *lmf = mono_get_lmf ();
568 MonoJitInfo *ji, rji;
569 MonoContext ctx, new_ctx, ji_ctx;
570 MonoDebugSourceLocation *location;
571 MonoMethod *last_method = NULL, *actual_method;
573 MONO_ARCH_CONTEXT_DEF;
575 mono_arch_flush_register_windows ();
577 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
578 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
580 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
585 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
588 if (ji && ji != (gpointer)-1 &&
589 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
590 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
594 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
597 /* skip all wrappers ??*/
598 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
599 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
600 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
601 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
602 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
603 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
606 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
608 * FIXME: Native-to-managed wrappers sometimes show up twice.
609 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
615 last_method = ji->method;
621 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
623 *method = mono_method_get_object (domain, actual_method, NULL);
625 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
627 *iloffset = location->il_offset;
631 if (need_file_info) {
633 *file = mono_string_new (domain, location->source_file);
634 *line = location->row;
635 *column = location->column;
642 mono_debug_free_source_location (location);
649 MonoSecurityFrame *frame;
650 } MonoFrameSecurityInfo;
653 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
655 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
657 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
658 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
659 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
660 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
661 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
662 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
671 si->frame = mono_declsec_create_frame (domain, ji);
673 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
678 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
679 * @skip: the number of stack frames to skip
681 * This function returns a the security informations of a single stack frame
682 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
683 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
687 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
689 MonoDomain *domain = mono_domain_get ();
690 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
691 MonoFrameSecurityInfo si;
694 MONO_ARCH_CONTEXT_DEF
696 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
697 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
699 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
702 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
708 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
710 return (si.skips == 0) ? si.frame : NULL;
722 grow_array (MonoSecurityStack *stack)
724 MonoDomain *domain = mono_domain_get ();
725 guint32 newsize = (stack->maximum << 1);
726 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
728 for (i=0; i < stack->maximum; i++) {
729 gpointer frame = mono_array_get (stack->stack, gpointer, i);
730 mono_array_setref (newstack, i, frame);
732 stack->maximum = newsize;
733 stack->stack = newstack;
737 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
739 MonoSecurityStack *ss = (MonoSecurityStack*) data;
741 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
742 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
743 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
744 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
745 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
746 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
755 if (ss->count == ss->maximum)
758 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
760 /* continue down the stack */
765 glist_to_array (GList *list, MonoClass *eclass)
767 MonoDomain *domain = mono_domain_get ();
774 len = g_list_length (list);
775 res = mono_array_new (domain, eclass, len);
777 for (i = 0; list; list = list->next, i++)
778 mono_array_set (res, gpointer, i, list->data);
784 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
785 * @skip: the number of stack frames to skip
787 * This function returns an managed array of containing the security
788 * informations for each frame (after the skipped ones). This is used for
789 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
793 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
795 MonoDomain *domain = mono_domain_get ();
796 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
797 MonoSecurityStack ss;
800 MONO_ARCH_CONTEXT_DEF
802 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
803 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
805 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
808 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
814 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
815 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
816 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
817 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
822 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
824 MonoClass *catch_class = ei->data.catch_class;
825 MonoType *inflated_type;
826 MonoGenericContext context;
831 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
833 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
835 /* FIXME: we shouldn't inflate but instead put the
836 type in the rgctx and fetch it from there. It
837 might be a good idea to do this lazily, i.e. only
838 when the exception is actually thrown, so as not to
839 waste space for exception clauses which might never
841 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
842 catch_class = mono_class_from_mono_type (inflated_type);
843 mono_metadata_free_type (inflated_type);
849 * mono_handle_exception_internal:
850 * @ctx: saved processor state
851 * @obj: the exception object
852 * @test_only: only test if the exception is caught, but dont call handlers
853 * @out_filter_idx: out parameter. if test_only is true, set to the index of
854 * the first filter clause which caught the exception.
857 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gint32 *out_filter_idx)
859 MonoDomain *domain = mono_domain_get ();
860 MonoJitInfo *ji, rji;
861 static int (*call_filter) (MonoContext *, gpointer) = NULL;
862 static void (*restore_context) (void *);
863 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
864 MonoLMF *lmf = mono_get_lmf ();
865 MonoArray *initial_trace_ips = NULL;
866 GList *trace_ips = NULL;
867 MonoException *mono_ex;
868 gboolean stack_overflow = FALSE;
869 MonoContext initial_ctx;
871 gboolean has_dynamic_methods = FALSE;
872 gint32 filter_idx, first_filter_idx;
874 g_assert (ctx != NULL);
876 MonoException *ex = mono_get_exception_null_reference ();
877 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
878 obj = (MonoObject *)ex;
882 * Allocate a new exception object instead of the preconstructed ones.
884 if (obj == domain->stack_overflow_ex) {
886 * It is not a good idea to try and put even more pressure on the little stack available.
887 * obj = mono_get_exception_stack_overflow ();
889 stack_overflow = TRUE;
891 else if (obj == domain->null_reference_ex) {
892 obj = mono_get_exception_null_reference ();
895 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
896 mono_ex = (MonoException*)obj;
897 initial_trace_ips = mono_ex->trace_ips;
902 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
903 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
904 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
905 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
906 mono_ex->message = mono_string_new (domain, msg);
913 call_filter = mono_get_call_filter ();
915 if (!restore_context)
916 restore_context = mono_get_restore_context ();
918 g_assert (jit_tls->end_of_stack);
919 g_assert (jit_tls->abort_func);
922 MonoContext ctx_cp = *ctx;
923 if (mono_trace_is_enabled ())
924 g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
925 mono_profiler_exception_thrown (obj);
926 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, &first_filter_idx)) {
927 if (mono_break_on_exc)
929 // FIXME: This runs managed code so it might cause another stack overflow when
930 // we are handling a stack overflow
931 mono_unhandled_exception (obj);
936 *out_filter_idx = -1;
939 memset (&rji, 0, sizeof (rji));
945 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
946 NULL, &lmf, NULL, NULL);
948 g_warning ("Exception inside function without unwind info");
949 g_assert_not_reached ();
952 if (ji != (gpointer)-1 && !(ji->code_start <= MONO_CONTEXT_GET_IP (ctx) && (((guint8*)ji->code_start + ji->code_size >= (guint8*)MONO_CONTEXT_GET_IP (ctx))))) {
954 * The exception was raised in native code and we got back to managed code
961 if (ji != (gpointer)-1) {
963 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
965 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
967 * Avoid overwriting the stack trace if the exception is
968 * rethrown. Also avoid giant stack traces during a stack
971 if (!initial_trace_ips && (frame_count < 1000)) {
972 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
973 trace_ips = g_list_prepend (trace_ips,
974 get_generic_info_from_stack_frame (ji, ctx));
978 if (ji->method->dynamic)
979 has_dynamic_methods = TRUE;
982 #ifndef MONO_ARCH_STACK_GROWS_UP
983 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
985 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
988 free_stack = 0xffffff;
991 * During stack overflow, wait till the unwinding frees some stack
992 * space before running handlers/finalizers.
994 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
997 for (i = 0; i < ji->num_clauses; i++) {
998 MonoJitExceptionInfo *ei = &ji->clauses [i];
999 gboolean filtered = FALSE;
1001 #if defined(__s390__)
1003 * This is required in cases where a try block starts immediately after
1004 * a call which causes an exception. Testcase: tests/exception8.cs.
1005 * FIXME: Clean this up.
1007 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1009 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1011 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1013 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1015 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1016 /* store the exception object in bp + ei->exvar_offset */
1017 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1020 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1021 // mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1023 mono_perfcounters->exceptions_filters++;
1024 filtered = call_filter (ctx, ei->data.filter);
1025 if (filtered && out_filter_idx)
1026 *out_filter_idx = filter_idx;
1030 * Filter clauses should only be run in the
1031 * first pass of exception handling.
1033 filtered = (filter_idx == first_filter_idx);
1038 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1039 mono_object_isinst (obj, catch_class)) || filtered) {
1041 if (mono_ex && !initial_trace_ips) {
1042 trace_ips = g_list_reverse (trace_ips);
1043 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1044 if (has_dynamic_methods)
1045 /* These methods could go away anytime, so compute the stack trace now */
1046 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1048 g_list_free (trace_ips);
1052 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1053 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1054 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1055 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1056 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1057 *(mono_get_lmf_addr ()) = lmf;
1058 mono_perfcounters->exceptions_depth += frame_count;
1059 if (obj == domain->stack_overflow_ex)
1060 jit_tls->handling_stack_ovf = FALSE;
1064 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1065 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1066 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1067 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1068 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1069 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1070 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1071 call_filter (ctx, ei->handler_start);
1073 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1074 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1075 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1076 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1077 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1078 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1079 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1080 mono_perfcounters->exceptions_finallys++;
1081 call_filter (ctx, ei->handler_start);
1088 mono_profiler_exception_method_leave (ji->method);
1093 if (ji == (gpointer)-1) {
1096 *(mono_get_lmf_addr ()) = lmf;
1098 jit_tls->abort_func (obj);
1099 g_assert_not_reached ();
1101 if (mono_ex && !initial_trace_ips) {
1102 trace_ips = g_list_reverse (trace_ips);
1103 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1104 if (has_dynamic_methods)
1105 /* These methods could go away anytime, so compute the stack trace now */
1106 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1108 g_list_free (trace_ips);
1114 g_assert_not_reached ();
1118 * mono_debugger_run_finally:
1119 * @start_ctx: saved processor state
1121 * This method is called by the Mono Debugger to call all `finally' clauses of the
1122 * current stack frame. It's used when the user issues a `return' command to make
1123 * the current stack frame return. After returning from this method, the debugger
1124 * unwinds the stack one frame and gives control back to the user.
1126 * NOTE: This method is only used when running inside the Mono Debugger.
1129 mono_debugger_run_finally (MonoContext *start_ctx)
1131 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1132 MonoDomain *domain = mono_domain_get ();
1133 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1134 MonoLMF *lmf = mono_get_lmf ();
1135 MonoContext ctx, new_ctx;
1136 MonoJitInfo *ji, rji;
1141 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1142 if (!ji || ji == (gpointer)-1)
1146 call_filter = mono_get_call_filter ();
1148 for (i = 0; i < ji->num_clauses; i++) {
1149 MonoJitExceptionInfo *ei = &ji->clauses [i];
1151 if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
1152 (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
1153 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1154 call_filter (&ctx, ei->handler_start);
1160 * mono_handle_exception:
1161 * @ctx: saved processor state
1162 * @obj: the exception object
1163 * @test_only: only test if the exception is caught, but dont call handlers
1166 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1169 mono_perfcounters->exceptions_thrown++;
1170 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, NULL);
1173 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1175 #ifndef MONO_ARCH_USE_SIGACTION
1176 #error "Can't use sigaltstack without sigaction"
1179 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1182 mono_setup_altstack (MonoJitTlsData *tls)
1185 struct sigaltstack sa;
1186 guint8 *staddr = NULL;
1188 if (mono_running_on_valgrind ())
1191 mono_thread_get_stack_bounds (&staddr, &stsize);
1195 tls->end_of_stack = staddr + stsize;
1197 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1199 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1200 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1202 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1203 /* mprotect can fail for the main thread stack */
1204 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);
1205 g_assert (gaddr == tls->stack_ovf_guard_base);
1209 * threads created by nptl does not seem to have a guard page, and
1210 * since the main thread is not created by us, we can't even set one.
1211 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1212 * is a stack overflow exception.
1214 tls->stack_size = stsize + mono_pagesize ();
1216 /* Setup an alternate signal stack */
1217 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1218 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1220 g_assert (tls->signal_stack);
1222 sa.ss_sp = tls->signal_stack;
1223 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1224 sa.ss_flags = SS_ONSTACK;
1225 sigaltstack (&sa, NULL);
1229 mono_free_altstack (MonoJitTlsData *tls)
1231 struct sigaltstack sa;
1234 sa.ss_sp = tls->signal_stack;
1235 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1236 sa.ss_flags = SS_DISABLE;
1237 err = sigaltstack (&sa, NULL);
1238 g_assert (err == 0);
1240 if (tls->signal_stack)
1241 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1244 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1247 mono_setup_altstack (MonoJitTlsData *tls)
1252 mono_free_altstack (MonoJitTlsData *tls)
1256 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1259 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1261 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1262 /* we need to leave some room for throwing the exception */
1263 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1264 unprotect_size -= mono_pagesize ();
1265 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1266 * is sufficient stack
1268 //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);
1270 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1271 return unprotect_size == jit_tls->stack_ovf_guard_size;
1275 try_more_restore (void)
1277 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1278 if (try_restore_stack_protection (jit_tls, 500))
1279 jit_tls->restore_stack_prot = NULL;
1283 restore_stack_protection (void)
1285 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1286 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1287 /* if we can't restore the stack protection, keep a callback installed so
1288 * we'll try to restore as much stack as we can at each return from unmanaged
1291 if (try_restore_stack_protection (jit_tls, 4096))
1292 jit_tls->restore_stack_prot = NULL;
1294 jit_tls->restore_stack_prot = try_more_restore_tramp;
1295 /* here we also throw a stack overflow exception */
1296 ex->trace_ips = NULL;
1297 ex->stack_trace = NULL;
1298 mono_raise_exception (ex);
1302 mono_altstack_restore_prot (gssize *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1304 void (*func)(void) = (gpointer)tramp_data;
1310 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1312 /* we got a stack overflow in the soft-guard pages
1313 * There are two cases:
1314 * 1) managed code caused the overflow: we unprotect the soft-guard page
1315 * and let the arch-specific code trigger the exception handling mechanism
1316 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1317 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1318 * and hope we can continue with those enabled, at least until the hard-guard page
1319 * is hit. The alternative to continuing here is to just print a message and abort.
1320 * We may add in the future the code to protect the pages again in the codepath
1321 * when we return from unmanaged to managed code.
1323 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1324 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1325 /* we unprotect the minimum amount we can */
1327 gboolean handled = FALSE;
1329 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1330 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1331 guard_size -= mono_pagesize ();
1333 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1334 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1335 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);
1336 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1338 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1343 /* We print a message: after this even managed stack overflows
1344 * may crash the runtime
1346 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1347 if (!jit_tls->handling_stack_ovf) {
1348 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1349 jit_tls->handling_stack_ovf = 1;
1351 /*fprintf (stderr, "Already handling stack overflow\n");*/
1360 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1362 FILE *stream = (FILE*)data;
1365 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1366 fprintf (stream, " %s\n", location);
1369 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1374 static G_GNUC_UNUSED gboolean
1375 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1378 GString *p = (GString*)data;
1381 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1382 g_string_append_printf (p, " %s\n", location);
1385 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1390 static gboolean handling_sigsegv = FALSE;
1393 * mono_handle_native_sigsegv:
1395 * Handle a SIGSEGV received while in native code by printing diagnostic
1396 * information and aborting.
1399 mono_handle_native_sigsegv (int signal, void *ctx)
1401 #ifdef MONO_ARCH_USE_SIGACTION
1402 struct sigaction sa;
1404 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1406 if (handling_sigsegv)
1409 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1410 fprintf (stderr, "Received SIGSEGV, suspending...");
1415 /* To prevent infinite loops when the stack walk causes a crash */
1416 handling_sigsegv = TRUE;
1418 /* !jit_tls means the thread was not registered with the runtime */
1420 fprintf (stderr, "Stacktrace:\n\n");
1422 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1427 #ifdef HAVE_BACKTRACE_SYMBOLS
1432 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1434 fprintf (stderr, "\nNative stacktrace:\n\n");
1436 size = backtrace (array, 256);
1437 names = backtrace_symbols (array, size);
1438 for (i =0; i < size; ++i) {
1439 fprintf (stderr, "\t%s\n", names [i]);
1445 /* Try to get more meaningful information using gdb */
1447 #if !defined(PLATFORM_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1448 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1449 /* From g_spawn_command_line_sync () in eglib */
1451 int stdout_pipe [2] = { -1, -1 };
1453 const char *argv [16];
1458 res = pipe (stdout_pipe);
1459 g_assert (res != -1);
1463 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1464 * it will deadlock. Call the syscall directly instead.
1466 pid = syscall (SYS_fork);
1468 close (stdout_pipe [0]);
1469 dup2 (stdout_pipe [1], STDOUT_FILENO);
1471 for (i = getdtablesize () - 1; i >= 3; i--)
1474 argv [0] = g_find_program_in_path ("gdb");
1475 if (argv [0] == NULL) {
1476 close (STDOUT_FILENO);
1481 sprintf (buf1, "attach %ld", (long)getpid ());
1484 argv [4] = "info threads";
1486 argv [6] = "thread apply all bt";
1487 argv [7] = "--batch";
1490 execv (argv [0], (char**)argv);
1494 close (stdout_pipe [1]);
1496 fprintf (stderr, "\nDebug info from gdb:\n\n");
1499 int nread = read (stdout_pipe [0], buffer, 1024);
1503 write (STDERR_FILENO, buffer, nread);
1506 waitpid (pid, &status, WNOHANG);
1510 * A SIGSEGV indicates something went very wrong so we can no longer depend
1511 * on anything working. So try to print out lots of diagnostics, starting
1512 * with ones which have a greater chance of working.
1516 "=================================================================\n"
1517 "Got a %s while executing native code. This usually indicates\n"
1518 "a fatal error in the mono runtime or one of the native libraries \n"
1519 "used by your application.\n"
1520 "=================================================================\n"
1526 #ifdef MONO_ARCH_USE_SIGACTION
1528 /* Remove our SIGABRT handler */
1529 sa.sa_handler = SIG_DFL;
1530 sigemptyset (&sa.sa_mask);
1533 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1541 * mono_print_thread_dump:
1543 * Print information about the current thread to stdout.
1544 * SIGCTX can be NULL, allowing this to be called from gdb.
1547 mono_print_thread_dump (void *sigctx)
1549 MonoThread *thread = mono_thread_current ();
1550 #if defined(__i386__) || defined(__x86_64__)
1553 GString* text = g_string_new (0);
1554 char *name, *wapi_desc;
1555 GError *error = NULL;
1558 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1560 g_string_append_printf (text, "\n\"%s\"", name);
1563 else if (thread->threadpool_thread)
1564 g_string_append (text, "\n\"<threadpool thread>\"");
1566 g_string_append (text, "\n\"<unnamed thread>\"");
1568 #ifndef PLATFORM_WIN32
1569 wapi_desc = wapi_current_thread_desc ();
1570 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
1574 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
1576 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
1578 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
1580 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
1582 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
1585 fprintf (stdout, text->str);
1586 g_string_free (text, TRUE);