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;
263 if (!ji->has_generic_jit_info)
265 gi = mono_jit_info_get_generic_jit_info (ji);
270 return mono_arch_context_get_int_reg (ctx, gi->this_reg);
272 return *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
276 static MonoGenericContext
277 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
279 MonoGenericContext context = { NULL, NULL };
280 MonoClass *class, *method_container_class;
282 g_assert (generic_info);
284 g_assert (ji->method->is_inflated);
285 if (mono_method_get_context (ji->method)->method_inst) {
286 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
288 class = mrgctx->class_vtable->klass;
289 context.method_inst = mrgctx->method_inst;
290 g_assert (context.method_inst);
291 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
292 MonoVTable *vtable = generic_info;
294 class = vtable->klass;
296 MonoObject *this = generic_info;
298 class = this->vtable->klass;
301 if (class->generic_class || class->generic_container)
302 context.class_inst = mini_class_get_context (class)->class_inst;
304 g_assert (!ji->method->klass->generic_container);
305 if (ji->method->klass->generic_class)
306 method_container_class = ji->method->klass->generic_class->container_class;
308 method_container_class = ji->method->klass;
310 if (class->generic_class)
311 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
313 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
319 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
321 MonoGenericContext context;
324 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
326 context = get_generic_context_from_stack_frame (ji, generic_info);
328 method = mono_method_get_declaring_generic_method (ji->method);
329 method = mono_class_inflate_generic_method (method, &context);
335 ves_icall_System_Exception_get_trace (MonoException *ex)
337 MonoDomain *domain = mono_domain_get ();
339 MonoArray *ta = ex->trace_ips;
344 /* Exception is not thrown yet */
347 len = mono_array_length (ta) >> 1;
348 trace_str = g_string_new ("");
349 for (i = 0; i < len; i++) {
351 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
352 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
354 ji = mono_jit_info_table_find (domain, ip);
356 /* Unmanaged frame */
357 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
361 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
363 address = (char *)ip - (char *)ji->code_start;
364 location = mono_debug_print_stack_frame (
365 method, address, ex->object.vtable->domain);
367 g_string_append_printf (trace_str, "%s\n", location);
372 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
373 g_string_free (trace_str, TRUE);
379 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
381 MonoDomain *domain = mono_domain_get ();
383 MonoArray *ta = exc->trace_ips;
384 MonoDebugSourceLocation *location;
388 /* Exception is not thrown yet */
389 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
392 len = mono_array_length (ta) >> 1;
394 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
396 for (i = skip; i < len; i++) {
398 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
399 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
400 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
403 ji = mono_jit_info_table_find (domain, ip);
405 /* Unmanaged frame */
406 mono_array_setref (res, i, sf);
410 g_assert (ji != NULL);
412 method = get_method_from_stack_frame (ji, generic_info);
413 if (ji->method->wrapper_type) {
417 s = mono_method_full_name (method, TRUE);
418 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
422 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
423 sf->native_offset = (char *)ip - (char *)ji->code_start;
426 * mono_debug_lookup_source_location() returns both the file / line number information
427 * and the IL offset. Note that computing the IL offset is already an expensive
428 * operation, so we shouldn't call this method twice.
430 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
432 sf->il_offset = location->il_offset;
436 if (need_file_info) {
437 if (location && location->source_file) {
438 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
439 sf->line = location->row;
440 sf->column = location->column;
442 sf->line = sf->column = 0;
447 mono_debug_free_source_location (location);
448 mono_array_setref (res, i, sf);
456 * @domain: starting appdomain
457 * @jit_tls: JIT data for the thread
458 * @start_ctx: starting state of the stack frame
459 * @func: callback to call for each stack frame
460 * @user_data: data passed to the callback
462 * This function walks the stack of a thread, starting from the state
463 * represented by jit_tls and start_ctx. For each frame the callback
464 * function is called with the relevant info. The walk ends when no more
465 * managed stack frames are found or when the callback returns a TRUE value.
466 * Note that the function can be used to walk the stack of a thread
467 * different from the current.
470 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
472 MonoLMF *lmf = mono_get_lmf ();
473 MonoJitInfo *ji, rji;
476 MonoContext ctx, new_ctx;
480 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
482 * FIXME: mono_find_jit_info () will need to be able to return a different
483 * MonoDomain when apddomain transitions are found on the stack.
485 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
486 if (!ji || ji == (gpointer)-1)
489 if (func (domain, &new_ctx, ji, user_data))
497 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
499 MonoDomain *domain = mono_domain_get ();
500 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
501 MonoLMF *lmf = mono_get_lmf ();
502 MonoJitInfo *ji, rji;
503 gint native_offset, il_offset;
505 MonoContext ctx, new_ctx;
507 MONO_ARCH_CONTEXT_DEF
509 mono_arch_flush_register_windows ();
512 memcpy (&ctx, start_ctx, sizeof (MonoContext));
514 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
515 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
517 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
521 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
522 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
525 if (ji == (gpointer)-1)
529 MonoDebugSourceLocation *source;
531 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
532 il_offset = source ? source->il_offset : -1;
533 mono_debug_free_source_location (source);
537 if (func (ji->method, native_offset, il_offset, managed, user_data))
545 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
547 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
551 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
552 MonoReflectionMethod **method,
553 gint32 *iloffset, gint32 *native_offset,
554 MonoString **file, gint32 *line, gint32 *column)
556 MonoDomain *domain = mono_domain_get ();
557 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
558 MonoLMF *lmf = mono_get_lmf ();
559 MonoJitInfo *ji, rji;
560 MonoContext ctx, new_ctx, ji_ctx;
561 MonoDebugSourceLocation *location;
562 MonoMethod *last_method = NULL, *actual_method;
564 MONO_ARCH_CONTEXT_DEF;
566 mono_arch_flush_register_windows ();
568 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
569 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
571 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
576 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
579 if (ji && ji != (gpointer)-1 &&
580 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
581 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
585 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
588 /* skip all wrappers ??*/
589 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
590 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
591 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
592 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
593 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
594 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
597 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
599 * FIXME: Native-to-managed wrappers sometimes show up twice.
600 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
606 last_method = ji->method;
612 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
614 *method = mono_method_get_object (domain, actual_method, NULL);
616 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
618 *iloffset = location->il_offset;
622 if (need_file_info) {
624 *file = mono_string_new (domain, location->source_file);
625 *line = location->row;
626 *column = location->column;
633 mono_debug_free_source_location (location);
640 MonoSecurityFrame *frame;
641 } MonoFrameSecurityInfo;
644 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
646 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
648 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
649 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
650 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
651 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
652 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
653 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
662 si->frame = mono_declsec_create_frame (domain, ji);
664 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
669 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
670 * @skip: the number of stack frames to skip
672 * This function returns a the security informations of a single stack frame
673 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
674 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
678 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
680 MonoDomain *domain = mono_domain_get ();
681 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
682 MonoFrameSecurityInfo si;
685 MONO_ARCH_CONTEXT_DEF
687 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
688 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
690 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
693 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
699 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
701 return (si.skips == 0) ? si.frame : NULL;
713 grow_array (MonoSecurityStack *stack)
715 MonoDomain *domain = mono_domain_get ();
716 guint32 newsize = (stack->maximum << 1);
717 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
719 for (i=0; i < stack->maximum; i++) {
720 gpointer frame = mono_array_get (stack->stack, gpointer, i);
721 mono_array_setref (newstack, i, frame);
723 stack->maximum = newsize;
724 stack->stack = newstack;
728 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
730 MonoSecurityStack *ss = (MonoSecurityStack*) data;
732 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
733 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
734 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
735 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
736 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
737 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
746 if (ss->count == ss->maximum)
749 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
751 /* continue down the stack */
756 glist_to_array (GList *list, MonoClass *eclass)
758 MonoDomain *domain = mono_domain_get ();
765 len = g_list_length (list);
766 res = mono_array_new (domain, eclass, len);
768 for (i = 0; list; list = list->next, i++)
769 mono_array_set (res, gpointer, i, list->data);
775 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
776 * @skip: the number of stack frames to skip
778 * This function returns an managed array of containing the security
779 * informations for each frame (after the skipped ones). This is used for
780 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
784 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
786 MonoDomain *domain = mono_domain_get ();
787 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
788 MonoSecurityStack ss;
791 MONO_ARCH_CONTEXT_DEF
793 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
794 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
796 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
799 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
805 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
806 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
807 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
808 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
813 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
815 MonoClass *catch_class = ei->data.catch_class;
816 MonoType *inflated_type;
817 MonoGenericContext context;
822 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
824 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
826 /* FIXME: we shouldn't inflate but instead put the
827 type in the rgctx and fetch it from there. It
828 might be a good idea to do this lazily, i.e. only
829 when the exception is actually thrown, so as not to
830 waste space for exception clauses which might never
832 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
833 catch_class = mono_class_from_mono_type (inflated_type);
834 mono_metadata_free_type (inflated_type);
840 * mono_handle_exception_internal:
841 * @ctx: saved processor state
842 * @obj: the exception object
843 * @test_only: only test if the exception is caught, but dont call handlers
844 * @out_filter_idx: out parameter. if test_only is true, set to the index of
845 * the first filter clause which caught the exception.
848 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gint32 *out_filter_idx)
850 MonoDomain *domain = mono_domain_get ();
851 MonoJitInfo *ji, rji;
852 static int (*call_filter) (MonoContext *, gpointer) = NULL;
853 static void (*restore_context) (void *);
854 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
855 MonoLMF *lmf = mono_get_lmf ();
856 MonoArray *initial_trace_ips = NULL;
857 GList *trace_ips = NULL;
858 MonoException *mono_ex;
859 gboolean stack_overflow = FALSE;
860 MonoContext initial_ctx;
862 gboolean has_dynamic_methods = FALSE;
863 gint32 filter_idx, first_filter_idx;
865 g_assert (ctx != NULL);
867 MonoException *ex = mono_get_exception_null_reference ();
868 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
869 obj = (MonoObject *)ex;
873 * Allocate a new exception object instead of the preconstructed ones.
875 if (obj == domain->stack_overflow_ex) {
877 * It is not a good idea to try and put even more pressure on the little stack available.
878 * obj = mono_get_exception_stack_overflow ();
880 stack_overflow = TRUE;
882 else if (obj == domain->null_reference_ex) {
883 obj = mono_get_exception_null_reference ();
886 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
887 mono_ex = (MonoException*)obj;
888 initial_trace_ips = mono_ex->trace_ips;
893 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
894 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
895 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
896 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
897 mono_ex->message = mono_string_new (domain, msg);
904 call_filter = mono_get_call_filter ();
906 if (!restore_context)
907 restore_context = mono_get_restore_context ();
909 g_assert (jit_tls->end_of_stack);
910 g_assert (jit_tls->abort_func);
913 MonoContext ctx_cp = *ctx;
914 if (mono_trace_is_enabled ())
915 g_print ("EXCEPTION handling: %s\n", mono_object_class (obj)->name);
916 mono_profiler_exception_thrown (obj);
917 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, &first_filter_idx)) {
918 if (mono_break_on_exc)
920 // FIXME: This runs managed code so it might cause another stack overflow when
921 // we are handling a stack overflow
922 mono_unhandled_exception (obj);
927 *out_filter_idx = -1;
930 memset (&rji, 0, sizeof (rji));
936 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
937 NULL, &lmf, NULL, NULL);
939 g_warning ("Exception inside function without unwind info");
940 g_assert_not_reached ();
943 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))))) {
945 * The exception was raised in native code and we got back to managed code
952 if (ji != (gpointer)-1) {
954 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
956 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
958 * Avoid overwriting the stack trace if the exception is
959 * rethrown. Also avoid giant stack traces during a stack
962 if (!initial_trace_ips && (frame_count < 1000)) {
963 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
964 trace_ips = g_list_prepend (trace_ips,
965 get_generic_info_from_stack_frame (ji, ctx));
969 if (ji->method->dynamic)
970 has_dynamic_methods = TRUE;
973 #ifndef MONO_ARCH_STACK_GROWS_UP
974 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
976 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
979 free_stack = 0xffffff;
982 * During stack overflow, wait till the unwinding frees some stack
983 * space before running handlers/finalizers.
985 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
988 for (i = 0; i < ji->num_clauses; i++) {
989 MonoJitExceptionInfo *ei = &ji->clauses [i];
990 gboolean filtered = FALSE;
992 #if defined(__s390__)
994 * This is required in cases where a try block starts immediately after
995 * a call which causes an exception. Testcase: tests/exception8.cs.
996 * FIXME: Clean this up.
998 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1000 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1002 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1004 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1006 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1007 /* store the exception object in bp + ei->exvar_offset */
1008 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1011 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1012 // mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1014 mono_perfcounters->exceptions_filters++;
1015 filtered = call_filter (ctx, ei->data.filter);
1016 if (filtered && out_filter_idx)
1017 *out_filter_idx = filter_idx;
1021 * Filter clauses should only be run in the
1022 * first pass of exception handling.
1024 filtered = (filter_idx == first_filter_idx);
1029 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1030 mono_object_isinst (obj, catch_class)) || filtered) {
1032 if (mono_ex && !initial_trace_ips) {
1033 trace_ips = g_list_reverse (trace_ips);
1034 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1035 if (has_dynamic_methods)
1036 /* These methods could go away anytime, so compute the stack trace now */
1037 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1039 g_list_free (trace_ips);
1043 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1044 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1045 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1046 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1047 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1048 *(mono_get_lmf_addr ()) = lmf;
1049 mono_perfcounters->exceptions_depth += frame_count;
1050 if (obj == domain->stack_overflow_ex)
1051 jit_tls->handling_stack_ovf = FALSE;
1055 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1056 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1057 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1058 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1059 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1060 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1061 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1062 call_filter (ctx, ei->handler_start);
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_FINALLY)) {
1067 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1068 g_print ("EXCEPTION: finally 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 mono_perfcounters->exceptions_finallys++;
1072 call_filter (ctx, ei->handler_start);
1079 mono_profiler_exception_method_leave (ji->method);
1084 if (ji == (gpointer)-1) {
1087 *(mono_get_lmf_addr ()) = lmf;
1089 jit_tls->abort_func (obj);
1090 g_assert_not_reached ();
1092 if (mono_ex && !initial_trace_ips) {
1093 trace_ips = g_list_reverse (trace_ips);
1094 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1095 if (has_dynamic_methods)
1096 /* These methods could go away anytime, so compute the stack trace now */
1097 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1099 g_list_free (trace_ips);
1105 g_assert_not_reached ();
1109 * mono_debugger_run_finally:
1110 * @start_ctx: saved processor state
1112 * This method is called by the Mono Debugger to call all `finally' clauses of the
1113 * current stack frame. It's used when the user issues a `return' command to make
1114 * the current stack frame return. After returning from this method, the debugger
1115 * unwinds the stack one frame and gives control back to the user.
1117 * NOTE: This method is only used when running inside the Mono Debugger.
1120 mono_debugger_run_finally (MonoContext *start_ctx)
1122 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1123 MonoDomain *domain = mono_domain_get ();
1124 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1125 MonoLMF *lmf = mono_get_lmf ();
1126 MonoContext ctx, new_ctx;
1127 MonoJitInfo *ji, rji;
1132 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1133 if (!ji || ji == (gpointer)-1)
1137 call_filter = mono_get_call_filter ();
1139 for (i = 0; i < ji->num_clauses; i++) {
1140 MonoJitExceptionInfo *ei = &ji->clauses [i];
1142 if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
1143 (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
1144 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1145 call_filter (&ctx, ei->handler_start);
1151 * mono_handle_exception:
1152 * @ctx: saved processor state
1153 * @obj: the exception object
1154 * @test_only: only test if the exception is caught, but dont call handlers
1157 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1160 mono_perfcounters->exceptions_thrown++;
1161 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, NULL);
1164 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1166 #ifndef MONO_ARCH_USE_SIGACTION
1167 #error "Can't use sigaltstack without sigaction"
1170 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1173 mono_setup_altstack (MonoJitTlsData *tls)
1176 struct sigaltstack sa;
1177 guint8 *staddr = NULL;
1179 if (mono_running_on_valgrind ())
1182 mono_thread_get_stack_bounds (&staddr, &stsize);
1186 tls->end_of_stack = staddr + stsize;
1188 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1190 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1191 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1193 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1194 /* mprotect can fail for the main thread stack */
1195 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);
1196 g_assert (gaddr == tls->stack_ovf_guard_base);
1200 * threads created by nptl does not seem to have a guard page, and
1201 * since the main thread is not created by us, we can't even set one.
1202 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1203 * is a stack overflow exception.
1205 tls->stack_size = stsize + mono_pagesize ();
1207 /* Setup an alternate signal stack */
1208 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1209 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1211 g_assert (tls->signal_stack);
1213 sa.ss_sp = tls->signal_stack;
1214 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1215 sa.ss_flags = SS_ONSTACK;
1216 sigaltstack (&sa, NULL);
1220 mono_free_altstack (MonoJitTlsData *tls)
1222 struct sigaltstack sa;
1225 sa.ss_sp = tls->signal_stack;
1226 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1227 sa.ss_flags = SS_DISABLE;
1228 err = sigaltstack (&sa, NULL);
1229 g_assert (err == 0);
1231 if (tls->signal_stack)
1232 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1235 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1238 mono_setup_altstack (MonoJitTlsData *tls)
1243 mono_free_altstack (MonoJitTlsData *tls)
1247 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1250 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1252 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1253 /* we need to leave some room for throwing the exception */
1254 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1255 unprotect_size -= mono_pagesize ();
1256 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1257 * is sufficient stack
1259 //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);
1261 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1262 return unprotect_size == jit_tls->stack_ovf_guard_size;
1266 try_more_restore (void)
1268 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1269 if (try_restore_stack_protection (jit_tls, 500))
1270 jit_tls->restore_stack_prot = NULL;
1274 restore_stack_protection (void)
1276 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1277 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1278 /* if we can't restore the stack protection, keep a callback installed so
1279 * we'll try to restore as much stack as we can at each return from unmanaged
1282 if (try_restore_stack_protection (jit_tls, 4096))
1283 jit_tls->restore_stack_prot = NULL;
1285 jit_tls->restore_stack_prot = try_more_restore_tramp;
1286 /* here we also throw a stack overflow exception */
1287 ex->trace_ips = NULL;
1288 ex->stack_trace = NULL;
1289 mono_raise_exception (ex);
1293 mono_altstack_restore_prot (gssize *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1295 void (*func)(void) = (gpointer)tramp_data;
1301 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1303 /* we got a stack overflow in the soft-guard pages
1304 * There are two cases:
1305 * 1) managed code caused the overflow: we unprotect the soft-guard page
1306 * and let the arch-specific code trigger the exception handling mechanism
1307 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1308 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1309 * and hope we can continue with those enabled, at least until the hard-guard page
1310 * is hit. The alternative to continuing here is to just print a message and abort.
1311 * We may add in the future the code to protect the pages again in the codepath
1312 * when we return from unmanaged to managed code.
1314 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1315 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1316 /* we unprotect the minimum amount we can */
1318 gboolean handled = FALSE;
1320 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1321 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1322 guard_size -= mono_pagesize ();
1324 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1325 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1326 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);
1327 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1329 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1334 /* We print a message: after this even managed stack overflows
1335 * may crash the runtime
1337 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1338 if (!jit_tls->handling_stack_ovf) {
1339 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1340 jit_tls->handling_stack_ovf = 1;
1342 /*fprintf (stderr, "Already handling stack overflow\n");*/
1351 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1353 FILE *stream = (FILE*)data;
1356 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1357 fprintf (stream, " %s\n", location);
1360 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1365 static G_GNUC_UNUSED gboolean
1366 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1369 GString *p = (GString*)data;
1372 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1373 g_string_append_printf (p, " %s\n", location);
1376 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1381 static gboolean handling_sigsegv = FALSE;
1384 * mono_handle_native_sigsegv:
1386 * Handle a SIGSEGV received while in native code by printing diagnostic
1387 * information and aborting.
1390 mono_handle_native_sigsegv (int signal, void *ctx)
1392 #ifdef MONO_ARCH_USE_SIGACTION
1393 struct sigaction sa;
1395 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1397 if (handling_sigsegv)
1400 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1401 fprintf (stderr, "Received SIGSEGV, suspending...");
1406 /* To prevent infinite loops when the stack walk causes a crash */
1407 handling_sigsegv = TRUE;
1409 /* !jit_tls means the thread was not registered with the runtime */
1411 fprintf (stderr, "Stacktrace:\n\n");
1413 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1418 #ifdef HAVE_BACKTRACE_SYMBOLS
1423 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1425 fprintf (stderr, "\nNative stacktrace:\n\n");
1427 size = backtrace (array, 256);
1428 names = backtrace_symbols (array, size);
1429 for (i =0; i < size; ++i) {
1430 fprintf (stderr, "\t%s\n", names [i]);
1436 /* Try to get more meaningful information using gdb */
1438 #if !defined(PLATFORM_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1439 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1440 /* From g_spawn_command_line_sync () in eglib */
1442 int stdout_pipe [2] = { -1, -1 };
1444 const char *argv [16];
1449 res = pipe (stdout_pipe);
1450 g_assert (res != -1);
1454 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1455 * it will deadlock. Call the syscall directly instead.
1457 pid = syscall (SYS_fork);
1459 close (stdout_pipe [0]);
1460 dup2 (stdout_pipe [1], STDOUT_FILENO);
1462 for (i = getdtablesize () - 1; i >= 3; i--)
1465 argv [0] = g_find_program_in_path ("gdb");
1466 if (argv [0] == NULL) {
1467 close (STDOUT_FILENO);
1472 sprintf (buf1, "attach %ld", (long)getpid ());
1475 argv [4] = "info threads";
1477 argv [6] = "thread apply all bt";
1478 argv [7] = "--batch";
1481 execv (argv [0], (char**)argv);
1485 close (stdout_pipe [1]);
1487 fprintf (stderr, "\nDebug info from gdb:\n\n");
1490 int nread = read (stdout_pipe [0], buffer, 1024);
1494 write (STDERR_FILENO, buffer, nread);
1497 waitpid (pid, &status, WNOHANG);
1501 * A SIGSEGV indicates something went very wrong so we can no longer depend
1502 * on anything working. So try to print out lots of diagnostics, starting
1503 * with ones which have a greater chance of working.
1507 "=================================================================\n"
1508 "Got a %s while executing native code. This usually indicates\n"
1509 "a fatal error in the mono runtime or one of the native libraries \n"
1510 "used by your application.\n"
1511 "=================================================================\n"
1517 #ifdef MONO_ARCH_USE_SIGACTION
1519 /* Remove our SIGABRT handler */
1520 sa.sa_handler = SIG_DFL;
1521 sigemptyset (&sa.sa_mask);
1524 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1532 * mono_print_thread_dump:
1534 * Print information about the current thread to stdout.
1535 * SIGCTX can be NULL, allowing this to be called from gdb.
1538 mono_print_thread_dump (void *sigctx)
1540 MonoThread *thread = mono_thread_current ();
1541 #if defined(__i386__) || defined(__x86_64__)
1544 GString* text = g_string_new (0);
1545 char *name, *wapi_desc;
1546 GError *error = NULL;
1549 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1551 g_string_append_printf (text, "\n\"%s\"", name);
1554 else if (thread->threadpool_thread)
1555 g_string_append (text, "\n\"<threadpool thread>\"");
1557 g_string_append (text, "\n\"<unnamed thread>\"");
1559 #ifndef PLATFORM_WIN32
1560 wapi_desc = wapi_current_thread_desc ();
1561 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
1565 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
1567 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
1569 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
1571 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
1573 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
1576 fprintf (stdout, text->str);
1577 g_string_free (text, TRUE);