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 g_assert (!ji->method->klass->generic_container);
311 if (ji->method->klass->generic_class)
312 method_container_class = ji->method->klass->generic_class->container_class;
314 method_container_class = ji->method->klass;
316 /* class might refer to a subclass of ji->method's class */
317 while (class->generic_class && class->generic_class->container_class != method_container_class) {
318 class = class->parent;
322 if (class->generic_class || class->generic_container)
323 context.class_inst = mini_class_get_context (class)->class_inst;
325 if (class->generic_class)
326 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
328 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
334 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
336 MonoGenericContext context;
339 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
341 context = get_generic_context_from_stack_frame (ji, generic_info);
343 method = mono_method_get_declaring_generic_method (ji->method);
344 method = mono_class_inflate_generic_method (method, &context);
350 ves_icall_System_Exception_get_trace (MonoException *ex)
352 MonoDomain *domain = mono_domain_get ();
354 MonoArray *ta = ex->trace_ips;
359 /* Exception is not thrown yet */
362 len = mono_array_length (ta) >> 1;
363 trace_str = g_string_new ("");
364 for (i = 0; i < len; i++) {
366 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
367 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
369 ji = mono_jit_info_table_find (domain, ip);
371 /* Unmanaged frame */
372 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
376 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
378 address = (char *)ip - (char *)ji->code_start;
379 location = mono_debug_print_stack_frame (
380 method, address, ex->object.vtable->domain);
382 g_string_append_printf (trace_str, "%s\n", location);
387 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
388 g_string_free (trace_str, TRUE);
394 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
396 MonoDomain *domain = mono_domain_get ();
398 MonoArray *ta = exc->trace_ips;
399 MonoDebugSourceLocation *location;
403 /* Exception is not thrown yet */
404 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
407 len = mono_array_length (ta) >> 1;
409 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
411 for (i = skip; i < len; i++) {
413 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
414 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
415 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
418 ji = mono_jit_info_table_find (domain, ip);
420 /* Unmanaged frame */
421 mono_array_setref (res, i, sf);
425 g_assert (ji != NULL);
427 method = get_method_from_stack_frame (ji, generic_info);
428 if (ji->method->wrapper_type) {
432 s = mono_method_full_name (method, TRUE);
433 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
437 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
438 sf->native_offset = (char *)ip - (char *)ji->code_start;
441 * mono_debug_lookup_source_location() returns both the file / line number information
442 * and the IL offset. Note that computing the IL offset is already an expensive
443 * operation, so we shouldn't call this method twice.
445 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
447 sf->il_offset = location->il_offset;
451 if (need_file_info) {
452 if (location && location->source_file) {
453 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
454 sf->line = location->row;
455 sf->column = location->column;
457 sf->line = sf->column = 0;
462 mono_debug_free_source_location (location);
463 mono_array_setref (res, i, sf);
471 * @domain: starting appdomain
472 * @jit_tls: JIT data for the thread
473 * @start_ctx: starting state of the stack frame
474 * @func: callback to call for each stack frame
475 * @user_data: data passed to the callback
477 * This function walks the stack of a thread, starting from the state
478 * represented by jit_tls and start_ctx. For each frame the callback
479 * function is called with the relevant info. The walk ends when no more
480 * managed stack frames are found or when the callback returns a TRUE value.
481 * Note that the function can be used to walk the stack of a thread
482 * different from the current.
485 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
487 MonoLMF *lmf = mono_get_lmf ();
488 MonoJitInfo *ji, rji;
491 MonoContext ctx, new_ctx;
495 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
497 * FIXME: mono_find_jit_info () will need to be able to return a different
498 * MonoDomain when apddomain transitions are found on the stack.
500 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
501 if (!ji || ji == (gpointer)-1)
504 if (func (domain, &new_ctx, ji, user_data))
512 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
514 MonoDomain *domain = mono_domain_get ();
515 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
516 MonoLMF *lmf = mono_get_lmf ();
517 MonoJitInfo *ji, rji;
518 gint native_offset, il_offset;
520 MonoContext ctx, new_ctx;
522 MONO_ARCH_CONTEXT_DEF
524 mono_arch_flush_register_windows ();
527 memcpy (&ctx, start_ctx, sizeof (MonoContext));
529 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
530 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
532 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
536 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
537 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
540 if (ji == (gpointer)-1)
544 MonoDebugSourceLocation *source;
546 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
547 il_offset = source ? source->il_offset : -1;
548 mono_debug_free_source_location (source);
552 if (func (ji->method, native_offset, il_offset, managed, user_data))
560 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
562 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
566 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
567 MonoReflectionMethod **method,
568 gint32 *iloffset, gint32 *native_offset,
569 MonoString **file, gint32 *line, gint32 *column)
571 MonoDomain *domain = mono_domain_get ();
572 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
573 MonoLMF *lmf = mono_get_lmf ();
574 MonoJitInfo *ji, rji;
575 MonoContext ctx, new_ctx, ji_ctx;
576 MonoDebugSourceLocation *location;
577 MonoMethod *last_method = NULL, *actual_method;
579 MONO_ARCH_CONTEXT_DEF;
581 mono_arch_flush_register_windows ();
583 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
584 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
586 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
591 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
594 if (ji && ji != (gpointer)-1 &&
595 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
596 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
600 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
603 /* skip all wrappers ??*/
604 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
605 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
606 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
607 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
608 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
609 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
612 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
614 * FIXME: Native-to-managed wrappers sometimes show up twice.
615 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
621 last_method = ji->method;
627 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
629 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
631 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
633 *iloffset = location->il_offset;
637 if (need_file_info) {
639 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
640 *line = location->row;
641 *column = location->column;
648 mono_debug_free_source_location (location);
655 MonoSecurityFrame *frame;
656 } MonoFrameSecurityInfo;
659 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
661 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
663 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
664 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
665 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
666 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
667 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
668 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
677 si->frame = mono_declsec_create_frame (domain, ji);
679 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
684 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
685 * @skip: the number of stack frames to skip
687 * This function returns a the security informations of a single stack frame
688 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
689 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
693 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
695 MonoDomain *domain = mono_domain_get ();
696 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
697 MonoFrameSecurityInfo si;
700 MONO_ARCH_CONTEXT_DEF
702 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
703 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
705 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
708 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
714 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
716 return (si.skips == 0) ? si.frame : NULL;
728 grow_array (MonoSecurityStack *stack)
730 MonoDomain *domain = mono_domain_get ();
731 guint32 newsize = (stack->maximum << 1);
732 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
734 for (i=0; i < stack->maximum; i++) {
735 gpointer frame = mono_array_get (stack->stack, gpointer, i);
736 mono_array_setref (newstack, i, frame);
738 stack->maximum = newsize;
739 stack->stack = newstack;
743 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
745 MonoSecurityStack *ss = (MonoSecurityStack*) data;
747 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
748 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
749 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
750 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
751 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
752 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
761 if (ss->count == ss->maximum)
764 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
766 /* continue down the stack */
771 glist_to_array (GList *list, MonoClass *eclass)
773 MonoDomain *domain = mono_domain_get ();
780 len = g_list_length (list);
781 res = mono_array_new (domain, eclass, len);
783 for (i = 0; list; list = list->next, i++)
784 mono_array_set (res, gpointer, i, list->data);
790 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
791 * @skip: the number of stack frames to skip
793 * This function returns an managed array of containing the security
794 * informations for each frame (after the skipped ones). This is used for
795 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
799 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
801 MonoDomain *domain = mono_domain_get ();
802 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
803 MonoSecurityStack ss;
806 MONO_ARCH_CONTEXT_DEF
808 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
809 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
811 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
814 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
820 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
821 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
822 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
823 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
828 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
830 MonoClass *catch_class = ei->data.catch_class;
831 MonoType *inflated_type;
832 MonoGenericContext context;
837 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
839 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
841 /* FIXME: we shouldn't inflate but instead put the
842 type in the rgctx and fetch it from there. It
843 might be a good idea to do this lazily, i.e. only
844 when the exception is actually thrown, so as not to
845 waste space for exception clauses which might never
847 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
848 catch_class = mono_class_from_mono_type (inflated_type);
849 mono_metadata_free_type (inflated_type);
855 * mono_handle_exception_internal:
856 * @ctx: saved processor state
857 * @obj: the exception object
858 * @test_only: only test if the exception is caught, but dont call handlers
859 * @out_filter_idx: out parameter. if test_only is true, set to the index of
860 * the first filter clause which caught the exception.
863 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gint32 *out_filter_idx, MonoJitInfo **out_ji)
865 MonoDomain *domain = mono_domain_get ();
866 MonoJitInfo *ji, rji;
867 static int (*call_filter) (MonoContext *, gpointer) = NULL;
868 static void (*restore_context) (void *);
869 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
870 MonoLMF *lmf = mono_get_lmf ();
871 MonoArray *initial_trace_ips = NULL;
872 GList *trace_ips = NULL;
873 MonoException *mono_ex;
874 gboolean stack_overflow = FALSE;
875 MonoContext initial_ctx;
877 gboolean has_dynamic_methods = FALSE;
878 gint32 filter_idx, first_filter_idx;
880 g_assert (ctx != NULL);
882 MonoException *ex = mono_get_exception_null_reference ();
883 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
884 obj = (MonoObject *)ex;
888 * Allocate a new exception object instead of the preconstructed ones.
890 if (obj == domain->stack_overflow_ex) {
892 * It is not a good idea to try and put even more pressure on the little stack available.
893 * obj = mono_get_exception_stack_overflow ();
895 stack_overflow = TRUE;
897 else if (obj == domain->null_reference_ex) {
898 obj = mono_get_exception_null_reference ();
901 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
902 mono_ex = (MonoException*)obj;
903 initial_trace_ips = mono_ex->trace_ips;
908 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
909 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
910 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
911 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
912 mono_ex->message = mono_string_new (domain, msg);
919 call_filter = mono_get_call_filter ();
921 if (!restore_context)
922 restore_context = mono_get_restore_context ();
924 g_assert (jit_tls->end_of_stack);
925 g_assert (jit_tls->abort_func);
928 MonoContext ctx_cp = *ctx;
929 if (mono_trace_is_enabled ())
930 g_print ("[%p:] EXCEPTION handling: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name);
931 mono_profiler_exception_thrown (obj);
932 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, &first_filter_idx, out_ji)) {
933 if (mono_break_on_exc)
935 // FIXME: This runs managed code so it might cause another stack overflow when
936 // we are handling a stack overflow
937 mono_unhandled_exception (obj);
942 *out_filter_idx = -1;
947 memset (&rji, 0, sizeof (rji));
953 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
954 NULL, &lmf, NULL, NULL);
956 g_warning ("Exception inside function without unwind info");
957 g_assert_not_reached ();
960 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))))) {
962 * The exception was raised in native code and we got back to managed code
969 if (ji != (gpointer)-1) {
971 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
973 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
975 * Avoid overwriting the stack trace if the exception is
976 * rethrown. Also avoid giant stack traces during a stack
979 if (!initial_trace_ips && (frame_count < 1000)) {
980 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
981 trace_ips = g_list_prepend (trace_ips,
982 get_generic_info_from_stack_frame (ji, ctx));
986 if (ji->method->dynamic)
987 has_dynamic_methods = TRUE;
990 #ifndef MONO_ARCH_STACK_GROWS_UP
991 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
993 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
996 free_stack = 0xffffff;
999 * During stack overflow, wait till the unwinding frees some stack
1000 * space before running handlers/finalizers.
1002 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1005 for (i = 0; i < ji->num_clauses; i++) {
1006 MonoJitExceptionInfo *ei = &ji->clauses [i];
1007 gboolean filtered = FALSE;
1009 #if defined(__s390__)
1011 * This is required in cases where a try block starts immediately after
1012 * a call which causes an exception. Testcase: tests/exception8.cs.
1013 * FIXME: Clean this up.
1015 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1017 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1019 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1021 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1023 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1024 /* store the exception object in bp + ei->exvar_offset */
1025 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1028 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1030 mono_perfcounters->exceptions_filters++;
1031 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1032 filtered = call_filter (ctx, ei->data.filter);
1033 if (filtered && out_filter_idx)
1034 *out_filter_idx = filter_idx;
1040 * Filter clauses should only be run in the
1041 * first pass of exception handling.
1043 filtered = (filter_idx == first_filter_idx);
1048 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1049 mono_object_isinst (obj, catch_class)) || filtered) {
1051 if (mono_ex && !initial_trace_ips) {
1052 trace_ips = g_list_reverse (trace_ips);
1053 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1054 if (has_dynamic_methods)
1055 /* These methods could go away anytime, so compute the stack trace now */
1056 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1058 g_list_free (trace_ips);
1062 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1063 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1064 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1065 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1066 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1067 *(mono_get_lmf_addr ()) = lmf;
1068 mono_perfcounters->exceptions_depth += frame_count;
1069 if (obj == domain->stack_overflow_ex)
1070 jit_tls->handling_stack_ovf = FALSE;
1074 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1075 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1076 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1077 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1078 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1079 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1080 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1081 call_filter (ctx, ei->handler_start);
1083 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1084 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1085 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1086 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1087 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1088 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1089 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1090 mono_perfcounters->exceptions_finallys++;
1091 call_filter (ctx, ei->handler_start);
1098 mono_profiler_exception_method_leave (ji->method);
1103 if (ji == (gpointer)-1) {
1106 *(mono_get_lmf_addr ()) = lmf;
1108 jit_tls->abort_func (obj);
1109 g_assert_not_reached ();
1111 if (mono_ex && !initial_trace_ips) {
1112 trace_ips = g_list_reverse (trace_ips);
1113 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1114 if (has_dynamic_methods)
1115 /* These methods could go away anytime, so compute the stack trace now */
1116 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1118 g_list_free (trace_ips);
1124 g_assert_not_reached ();
1128 * mono_debugger_handle_exception:
1130 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1131 * at the exception and FALSE to resume with the normal exception handling.
1133 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1134 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1135 * `callq throw' instruction.
1138 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1140 MonoDebuggerExceptionAction action;
1142 if (!mono_debug_using_mono_debugger ())
1146 MonoException *ex = mono_get_exception_null_reference ();
1147 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1148 obj = (MonoObject *)ex;
1151 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1153 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1155 * The debugger wants us to stop on the `throw' instruction.
1156 * By the time we get here, it already inserted a breakpoint there.
1159 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1160 MonoContext ctx_cp = *ctx;
1161 MonoJitInfo *ji = NULL;
1165 * The debugger wants us to stop only if this exception is user-unhandled.
1168 ret = mono_handle_exception_internal (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), TRUE, NULL, &ji);
1169 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1171 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1172 * inside the method being invoked, so we handle it like a user-unhandled exception.
1179 * The exception is user-unhandled - tell the debugger to stop.
1181 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1185 * The exception is catched somewhere - resume with the normal exception handling and don't
1186 * stop in the debugger.
1194 * mono_debugger_run_finally:
1195 * @start_ctx: saved processor state
1197 * This method is called by the Mono Debugger to call all `finally' clauses of the
1198 * current stack frame. It's used when the user issues a `return' command to make
1199 * the current stack frame return. After returning from this method, the debugger
1200 * unwinds the stack one frame and gives control back to the user.
1202 * NOTE: This method is only used when running inside the Mono Debugger.
1205 mono_debugger_run_finally (MonoContext *start_ctx)
1207 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1208 MonoDomain *domain = mono_domain_get ();
1209 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1210 MonoLMF *lmf = mono_get_lmf ();
1211 MonoContext ctx, new_ctx;
1212 MonoJitInfo *ji, rji;
1217 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1218 if (!ji || ji == (gpointer)-1)
1222 call_filter = mono_get_call_filter ();
1224 for (i = 0; i < ji->num_clauses; i++) {
1225 MonoJitExceptionInfo *ei = &ji->clauses [i];
1227 if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
1228 (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
1229 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1230 call_filter (&ctx, ei->handler_start);
1236 * mono_handle_exception:
1237 * @ctx: saved processor state
1238 * @obj: the exception object
1239 * @test_only: only test if the exception is caught, but dont call handlers
1242 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1245 mono_perfcounters->exceptions_thrown++;
1246 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, NULL, NULL);
1249 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1251 #ifndef MONO_ARCH_USE_SIGACTION
1252 #error "Can't use sigaltstack without sigaction"
1255 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1258 mono_setup_altstack (MonoJitTlsData *tls)
1261 struct sigaltstack sa;
1262 guint8 *staddr = NULL;
1264 if (mono_running_on_valgrind ())
1267 mono_thread_get_stack_bounds (&staddr, &stsize);
1271 tls->end_of_stack = staddr + stsize;
1273 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1275 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1276 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1278 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1279 /* mprotect can fail for the main thread stack */
1280 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);
1281 g_assert (gaddr == tls->stack_ovf_guard_base);
1285 * threads created by nptl does not seem to have a guard page, and
1286 * since the main thread is not created by us, we can't even set one.
1287 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1288 * is a stack overflow exception.
1290 tls->stack_size = stsize + mono_pagesize ();
1292 /* Setup an alternate signal stack */
1293 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1294 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1296 g_assert (tls->signal_stack);
1298 sa.ss_sp = tls->signal_stack;
1299 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1300 sa.ss_flags = SS_ONSTACK;
1301 sigaltstack (&sa, NULL);
1305 mono_free_altstack (MonoJitTlsData *tls)
1307 struct sigaltstack sa;
1310 sa.ss_sp = tls->signal_stack;
1311 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1312 sa.ss_flags = SS_DISABLE;
1313 err = sigaltstack (&sa, NULL);
1314 g_assert (err == 0);
1316 if (tls->signal_stack)
1317 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1320 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1323 mono_setup_altstack (MonoJitTlsData *tls)
1328 mono_free_altstack (MonoJitTlsData *tls)
1332 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1335 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1337 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1338 /* we need to leave some room for throwing the exception */
1339 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1340 unprotect_size -= mono_pagesize ();
1341 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1342 * is sufficient stack
1344 //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);
1346 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1347 return unprotect_size == jit_tls->stack_ovf_guard_size;
1351 try_more_restore (void)
1353 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1354 if (try_restore_stack_protection (jit_tls, 500))
1355 jit_tls->restore_stack_prot = NULL;
1359 restore_stack_protection (void)
1361 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1362 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1363 /* if we can't restore the stack protection, keep a callback installed so
1364 * we'll try to restore as much stack as we can at each return from unmanaged
1367 if (try_restore_stack_protection (jit_tls, 4096))
1368 jit_tls->restore_stack_prot = NULL;
1370 jit_tls->restore_stack_prot = try_more_restore_tramp;
1371 /* here we also throw a stack overflow exception */
1372 ex->trace_ips = NULL;
1373 ex->stack_trace = NULL;
1374 mono_raise_exception (ex);
1378 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1380 void (*func)(void) = (gpointer)tramp_data;
1386 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1388 /* we got a stack overflow in the soft-guard pages
1389 * There are two cases:
1390 * 1) managed code caused the overflow: we unprotect the soft-guard page
1391 * and let the arch-specific code trigger the exception handling mechanism
1392 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1393 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1394 * and hope we can continue with those enabled, at least until the hard-guard page
1395 * is hit. The alternative to continuing here is to just print a message and abort.
1396 * We may add in the future the code to protect the pages again in the codepath
1397 * when we return from unmanaged to managed code.
1399 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1400 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1401 /* we unprotect the minimum amount we can */
1403 gboolean handled = FALSE;
1405 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1406 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1407 guard_size -= mono_pagesize ();
1409 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1410 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1411 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);
1412 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1414 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1419 /* We print a message: after this even managed stack overflows
1420 * may crash the runtime
1422 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1423 if (!jit_tls->handling_stack_ovf) {
1424 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1425 jit_tls->handling_stack_ovf = 1;
1427 /*fprintf (stderr, "Already handling stack overflow\n");*/
1436 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1438 FILE *stream = (FILE*)data;
1441 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1442 fprintf (stream, " %s\n", location);
1445 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1450 static G_GNUC_UNUSED gboolean
1451 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1454 GString *p = (GString*)data;
1457 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1458 g_string_append_printf (p, " %s\n", location);
1461 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1466 static gboolean handling_sigsegv = FALSE;
1469 * mono_handle_native_sigsegv:
1471 * Handle a SIGSEGV received while in native code by printing diagnostic
1472 * information and aborting.
1475 mono_handle_native_sigsegv (int signal, void *ctx)
1477 #ifdef MONO_ARCH_USE_SIGACTION
1478 struct sigaction sa;
1480 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1482 if (handling_sigsegv)
1485 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1486 fprintf (stderr, "Received SIGSEGV, suspending...");
1491 /* To prevent infinite loops when the stack walk causes a crash */
1492 handling_sigsegv = TRUE;
1494 /* !jit_tls means the thread was not registered with the runtime */
1496 fprintf (stderr, "Stacktrace:\n\n");
1498 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1503 #ifdef HAVE_BACKTRACE_SYMBOLS
1508 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1510 fprintf (stderr, "\nNative stacktrace:\n\n");
1512 size = backtrace (array, 256);
1513 names = backtrace_symbols (array, size);
1514 for (i =0; i < size; ++i) {
1515 fprintf (stderr, "\t%s\n", names [i]);
1521 /* Try to get more meaningful information using gdb */
1523 #if !defined(PLATFORM_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1524 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1525 /* From g_spawn_command_line_sync () in eglib */
1527 int stdout_pipe [2] = { -1, -1 };
1532 res = pipe (stdout_pipe);
1533 g_assert (res != -1);
1537 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1538 * it will deadlock. Call the syscall directly instead.
1540 pid = mono_runtime_syscall_fork ();
1543 close (stdout_pipe [0]);
1544 dup2 (stdout_pipe [1], STDOUT_FILENO);
1546 for (i = getdtablesize () - 1; i >= 3; i--)
1549 if (!mono_gdb_render_native_backtraces ())
1550 close (STDOUT_FILENO);
1555 close (stdout_pipe [1]);
1557 fprintf (stderr, "\nDebug info from gdb:\n\n");
1560 int nread = read (stdout_pipe [0], buffer, 1024);
1564 write (STDERR_FILENO, buffer, nread);
1567 waitpid (pid, &status, WNOHANG);
1571 * A SIGSEGV indicates something went very wrong so we can no longer depend
1572 * on anything working. So try to print out lots of diagnostics, starting
1573 * with ones which have a greater chance of working.
1577 "=================================================================\n"
1578 "Got a %s while executing native code. This usually indicates\n"
1579 "a fatal error in the mono runtime or one of the native libraries \n"
1580 "used by your application.\n"
1581 "=================================================================\n"
1587 #ifdef MONO_ARCH_USE_SIGACTION
1589 /* Remove our SIGABRT handler */
1590 sa.sa_handler = SIG_DFL;
1591 sigemptyset (&sa.sa_mask);
1594 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1602 * mono_print_thread_dump:
1604 * Print information about the current thread to stdout.
1605 * SIGCTX can be NULL, allowing this to be called from gdb.
1608 mono_print_thread_dump (void *sigctx)
1610 MonoThread *thread = mono_thread_current ();
1611 #if defined(__i386__) || defined(__x86_64__)
1614 GString* text = g_string_new (0);
1615 char *name, *wapi_desc;
1616 GError *error = NULL;
1619 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1621 g_string_append_printf (text, "\n\"%s\"", name);
1624 else if (thread->threadpool_thread)
1625 g_string_append (text, "\n\"<threadpool thread>\"");
1627 g_string_append (text, "\n\"<unnamed thread>\"");
1629 #ifndef PLATFORM_WIN32
1630 wapi_desc = wapi_current_thread_desc ();
1631 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
1635 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
1637 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
1639 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
1641 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
1643 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
1646 fprintf (stdout, text->str);
1647 g_string_free (text, TRUE);