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 Novell, Inc.
10 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
18 #ifdef HAVE_EXECINFO_H
22 #ifdef HAVE_SYS_TYPES_H
23 #include <sys/types.h>
26 #ifdef HAVE_SYS_WAIT_H
34 #ifdef HAVE_SYS_SYSCALL_H
35 #include <sys/syscall.h>
38 #include <mono/metadata/appdomain.h>
39 #include <mono/metadata/tabledefs.h>
40 #include <mono/metadata/threads.h>
41 #include <mono/metadata/threads-types.h>
42 #include <mono/metadata/debug-helpers.h>
43 #include <mono/metadata/exception.h>
44 #include <mono/metadata/gc-internal.h>
45 #include <mono/metadata/mono-debug.h>
46 #include <mono/metadata/profiler.h>
47 #include <mono/metadata/mono-endian.h>
48 #include <mono/utils/mono-mmap.h>
51 #include "debug-mini.h"
53 #include "debugger-agent.h"
55 #ifndef MONO_ARCH_CONTEXT_DEF
56 #define MONO_ARCH_CONTEXT_DEF
59 static gpointer restore_context_func, call_filter_func;
60 static gpointer throw_exception_func, rethrow_exception_func;
61 static gpointer throw_corlib_exception_func;
63 static gpointer try_more_restore_tramp = NULL;
64 static gpointer restore_stack_protection_tramp = NULL;
66 static void try_more_restore (void);
67 static void restore_stack_protection (void);
68 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
69 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
70 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
73 mono_exceptions_init (void)
75 MonoRuntimeExceptionHandlingCallbacks cbs;
77 restore_context_func = mono_aot_get_trampoline ("restore_context");
78 call_filter_func = mono_aot_get_trampoline ("call_filter");
79 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
80 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
84 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
86 mono_save_trampoline_xdebug_info (info);
87 mono_tramp_info_free (info);
89 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
91 mono_save_trampoline_xdebug_info (info);
92 mono_tramp_info_free (info);
94 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
96 mono_save_trampoline_xdebug_info (info);
97 mono_tramp_info_free (info);
99 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
101 mono_save_trampoline_xdebug_info (info);
102 mono_tramp_info_free (info);
105 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
106 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
107 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
110 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
111 mono_arch_exceptions_init ();
113 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
114 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
115 cbs.mono_raise_exception = mono_get_throw_exception ();
116 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
117 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
118 mono_install_eh_callbacks (&cbs);
122 mono_get_throw_exception (void)
124 g_assert (throw_exception_func);
125 return throw_exception_func;
129 mono_get_rethrow_exception (void)
131 g_assert (rethrow_exception_func);
132 return rethrow_exception_func;
136 mono_get_call_filter (void)
138 g_assert (call_filter_func);
139 return call_filter_func;
143 mono_get_restore_context (void)
145 g_assert (restore_context_func);
146 return restore_context_func;
150 mono_get_throw_corlib_exception (void)
152 gpointer code = NULL;
155 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
156 if (throw_corlib_exception_func)
157 return throw_corlib_exception_func;
160 code = mono_aot_get_trampoline ("throw_corlib_exception");
162 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
164 mono_save_trampoline_xdebug_info (info);
165 mono_tramp_info_free (info);
169 mono_memory_barrier ();
171 throw_corlib_exception_func = code;
173 return throw_corlib_exception_func;
177 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
179 MonoTryBlockHoleTableJitInfo *table;
184 if (ei->try_start > ip || ip >= ei->try_end)
187 if (!ji->has_try_block_holes)
190 table = mono_jit_info_get_try_block_hole_table_info (ji);
191 offset = (guint32)((char*)ip - (char*)ji->code_start);
192 clause = (guint16)(ei - ji->clauses);
193 g_assert (clause < ji->num_clauses);
195 for (i = 0; i < table->num_holes; ++i) {
196 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
197 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
206 * Translate between the mono_arch_find_jit_info function and the old API.
209 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
210 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
212 StackFrameInfo frame;
215 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
217 /* Avoid costly table lookup during stack overflow */
218 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
221 ji = mini_jit_info_table_find (domain, ip, NULL);
226 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
230 /* Convert between the new and the old APIs */
231 switch (frame.type) {
232 case FRAME_TYPE_MANAGED:
236 case FRAME_TYPE_MANAGED_TO_NATIVE:
240 memset (res, 0, sizeof (MonoJitInfo));
241 res->method = frame.method;
244 case FRAME_TYPE_DEBUGGER_INVOKE: {
248 * The normal exception handling code can't handle this frame, so just
251 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
252 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
256 g_assert_not_reached ();
261 /* mono_find_jit_info:
263 * This function is used to gather information from @ctx. It return the
264 * MonoJitInfo of the corresponding function, unwinds one stack frame and
265 * stores the resulting context into @new_ctx. It also stores a string
266 * describing the stack location into @trace (if not NULL), and modifies
267 * the @lmf if necessary. @native_offset return the IP offset from the
268 * start of the function or -1 if that info is not available.
271 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
272 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
276 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
288 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
290 if (ji == (gpointer)-1)
293 if (managed2 || (ji && ji->method->wrapper_type)) {
294 const char *real_ip, *start;
297 start = (const char *)ji->code_start;
299 /* ctx->ip points into native code */
300 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
302 real_ip = (const char*)ip;
304 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
305 offset = real_ip - start;
310 *native_offset = offset;
313 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
317 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
320 char *fname = mono_method_full_name (res->method, TRUE);
321 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
330 * mono_find_jit_info_ext:
332 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
334 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
335 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
336 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
337 * to obtain the last managed frame.
338 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
339 * On return, it will be filled with the locations where callee saved registers are saved
340 * by the current frame. This is returned outside of StackFrameInfo because it can be
341 * quite large on some platforms.
344 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
345 MonoJitInfo *prev_ji, MonoContext *ctx,
346 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
347 mgreg_t **save_locations,
348 StackFrameInfo *frame)
351 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
353 MonoDomain *target_domain;
358 /* Avoid costly table lookup during stack overflow */
359 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
362 ji = mini_jit_info_table_find (domain, ip, &target_domain);
365 target_domain = domain;
368 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
370 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
374 if (frame->type == FRAME_TYPE_MANAGED) {
375 if (!frame->ji->method->wrapper_type || frame->ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
376 frame->managed = TRUE;
379 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
381 * This type of frame is just a marker, the caller should unwind once more to get the
382 * last managed frame.
385 frame->method = NULL;
388 frame->native_offset = -1;
389 frame->domain = target_domain;
393 if (frame->type == FRAME_TYPE_MANAGED)
394 frame->method = ji->method;
396 if (ji && (frame->managed || ji->method->wrapper_type)) {
397 const char *real_ip, *start;
399 start = (const char *)ji->code_start;
401 /* ctx->ip points into native code */
402 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
404 real_ip = (const char*)ip;
406 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
407 frame->native_offset = real_ip - start;
409 frame->native_offset = -1;
412 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
414 if (trace && frame->method) {
415 char *fname = mono_method_full_name (frame->method, TRUE);
416 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
425 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
427 MonoGenericJitInfo *gi;
430 if (!ji->has_generic_jit_info)
432 gi = mono_jit_info_get_generic_jit_info (ji);
438 * Search location list if available, it contains the precise location of the
439 * argument for every pc offset, even if the method was interrupted while it was in
443 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
446 for (i = 0; i < gi->nlocs; ++i) {
447 MonoDwarfLocListEntry *entry = &gi->locations [i];
449 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
451 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
453 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
457 g_assert (i < gi->nlocs);
460 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
462 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
466 if (mono_method_get_context (ji->method)->method_inst) {
468 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
471 /* Avoid returning a managed object */
472 MonoObject *this_obj = info;
474 return this_obj->vtable->klass;
478 static MonoGenericContext
479 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
481 MonoGenericContext context = { NULL, NULL };
482 MonoClass *class, *method_container_class;
484 g_assert (generic_info);
486 g_assert (ji->method->is_inflated);
487 if (mono_method_get_context (ji->method)->method_inst) {
488 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
490 class = mrgctx->class_vtable->klass;
491 context.method_inst = mrgctx->method_inst;
492 g_assert (context.method_inst);
493 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
494 MonoVTable *vtable = generic_info;
496 class = vtable->klass;
498 class = generic_info;
501 //g_assert (!ji->method->klass->generic_container);
502 if (ji->method->klass->generic_class)
503 method_container_class = ji->method->klass->generic_class->container_class;
505 method_container_class = ji->method->klass;
507 /* class might refer to a subclass of ji->method's class */
508 while (!(class == ji->method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
509 class = class->parent;
513 if (class->generic_class || class->generic_container)
514 context.class_inst = mini_class_get_context (class)->class_inst;
516 if (class->generic_class)
517 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
519 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
525 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
527 MonoGenericContext context;
530 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
532 context = get_generic_context_from_stack_frame (ji, generic_info);
534 method = mono_method_get_declaring_generic_method (ji->method);
535 method = mono_class_inflate_generic_method (method, &context);
541 ves_icall_System_Exception_get_trace (MonoException *ex)
543 MonoDomain *domain = mono_domain_get ();
545 MonoArray *ta = ex->trace_ips;
550 /* Exception is not thrown yet */
553 len = mono_array_length (ta) >> 1;
554 trace_str = g_string_new ("");
555 for (i = 0; i < len; i++) {
557 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
558 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
560 ji = mono_jit_info_table_find (domain, ip);
562 /* Unmanaged frame */
563 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
567 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
569 address = (char *)ip - (char *)ji->code_start;
570 location = mono_debug_print_stack_frame (
571 method, address, ex->object.vtable->domain);
573 g_string_append_printf (trace_str, "%s\n", location);
578 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
579 g_string_free (trace_str, TRUE);
585 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
587 MonoDomain *domain = mono_domain_get ();
589 MonoArray *ta = exc->trace_ips;
590 MonoDebugSourceLocation *location;
594 /* Exception is not thrown yet */
595 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
598 len = mono_array_length (ta) >> 1;
600 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
602 for (i = skip; i < len; i++) {
604 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
605 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
606 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
609 ji = mono_jit_info_table_find (domain, ip);
611 /* Unmanaged frame */
612 mono_array_setref (res, i, sf);
616 g_assert (ji != NULL);
618 method = get_method_from_stack_frame (ji, generic_info);
619 if (ji->method->wrapper_type) {
623 s = mono_method_full_name (method, TRUE);
624 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
628 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
629 sf->native_offset = (char *)ip - (char *)ji->code_start;
632 * mono_debug_lookup_source_location() returns both the file / line number information
633 * and the IL offset. Note that computing the IL offset is already an expensive
634 * operation, so we shouldn't call this method twice.
636 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
638 sf->il_offset = location->il_offset;
642 if (need_file_info) {
643 if (location && location->source_file) {
644 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
645 sf->line = location->row;
646 sf->column = location->column;
648 sf->line = sf->column = 0;
653 mono_debug_free_source_location (location);
654 mono_array_setref (res, i, sf);
661 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
664 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
665 if (jit_tls && jit_tls->orig_ex_ctx_set)
666 start_ctx = &jit_tls->orig_ex_ctx;
668 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
671 * mono_walk_stack_with_ctx:
673 * Unwind the current thread starting at @start_ctx.
675 * If @start_ctx is null, we capture the current context.
678 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
680 MonoContext extra_ctx;
681 MonoInternalThread *thread = mono_thread_internal_current ();
682 MONO_ARCH_CONTEXT_DEF
684 if (!thread || !thread->jit_data)
688 mono_arch_flush_register_windows ();
690 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
691 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
693 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
695 start_ctx = &extra_ctx;
698 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
702 * mono_walk_stack_with_state:
704 * Unwind a thread described by @state.
706 * State must be valid (state->valid == TRUE).
708 * If you are using this function to unwind another thread, make sure it is suspended.
710 * If @state is null, we capture the current context.
713 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
715 MonoThreadUnwindState extra_state;
717 if (!mono_thread_state_init_from_current (&extra_state))
719 state = &extra_state;
722 g_assert (state->valid);
724 mono_walk_stack_full (func,
726 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
727 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
728 state->unwind_data [MONO_UNWIND_DATA_LMF],
729 unwind_options, user_data);
733 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
735 MonoThreadUnwindState state;
736 if (!mono_thread_state_init_from_current (&state))
738 mono_walk_stack_with_state (func, &state, options, user_data);
742 * mono_walk_stack_full:
743 * @func: callback to call for each stack frame
744 * @domain: starting appdomain, can be NULL to use the current domain
745 * @unwind_options: what extra information the unwinder should gather
746 * @start_ctx: starting state of the stack walk, can be NULL.
747 * @thread: the thread whose stack to walk, can be NULL to use the current thread
748 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
749 * @user_data: data passed to the callback
751 * This function walks the stack of a thread, starting from the state
752 * represented by start_ctx. For each frame the callback
753 * function is called with the relevant info. The walk ends when no more
754 * managed stack frames are found or when the callback returns a TRUE value.
757 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
760 MonoContext ctx, new_ctx;
761 StackFrameInfo frame;
763 mgreg_t *reg_locations [MONO_MAX_IREGS];
764 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
765 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
767 g_assert (start_ctx);
770 /*The LMF will be null if the target have no managed frames.*/
771 /* g_assert (lmf); */
773 memcpy (&ctx, start_ctx, sizeof (MonoContext));
774 memset (reg_locations, 0, sizeof (reg_locations));
776 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
778 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
782 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
783 MonoDebugSourceLocation *source;
785 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
786 il_offset = source ? source->il_offset : -1;
787 mono_debug_free_source_location (source);
791 frame.il_offset = il_offset;
793 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
794 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
796 frame.actual_method = frame.method;
799 if (get_reg_locations)
800 frame.reg_locations = reg_locations;
802 if (func (&frame, &ctx, user_data))
805 if (get_reg_locations) {
806 for (i = 0; i < MONO_MAX_IREGS; ++i)
807 if (new_reg_locations [i])
808 reg_locations [i] = new_reg_locations [i];
816 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
817 MonoReflectionMethod **method,
818 gint32 *iloffset, gint32 *native_offset,
819 MonoString **file, gint32 *line, gint32 *column)
821 MonoDomain *domain = mono_domain_get ();
822 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
823 MonoLMF *lmf = mono_get_lmf ();
824 MonoJitInfo *ji = NULL;
825 MonoContext ctx, new_ctx;
826 MonoDebugSourceLocation *location;
827 MonoMethod *actual_method;
828 StackFrameInfo frame;
831 MONO_ARCH_CONTEXT_DEF;
833 mono_arch_flush_register_windows ();
835 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
836 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
838 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
844 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
848 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
852 *native_offset = frame.native_offset;
854 /* skip all wrappers ??*/
855 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
856 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
857 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
858 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
859 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
860 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
866 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
868 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
870 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
872 *iloffset = location->il_offset;
876 if (need_file_info) {
878 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
879 *line = location->row;
880 *column = location->column;
887 mono_debug_free_source_location (location);
894 MonoSecurityFrame *frame;
895 } MonoFrameSecurityInfo;
898 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
900 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
901 MonoJitInfo *ji = frame->ji;
906 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
907 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
908 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
909 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
910 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
911 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
920 si->frame = mono_declsec_create_frame (frame->domain, ji);
922 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
927 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
928 * @skip: the number of stack frames to skip
930 * This function returns a the security informations of a single stack frame
931 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
932 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
936 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
938 MonoFrameSecurityInfo si;
943 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
945 return (si.skips == 0) ? si.frame : NULL;
957 grow_array (MonoSecurityStack *stack)
959 MonoDomain *domain = mono_domain_get ();
960 guint32 newsize = (stack->maximum << 1);
961 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
963 for (i=0; i < stack->maximum; i++) {
964 gpointer frame = mono_array_get (stack->stack, gpointer, i);
965 mono_array_setref (newstack, i, frame);
967 stack->maximum = newsize;
968 stack->stack = newstack;
972 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
974 MonoSecurityStack *ss = (MonoSecurityStack*) data;
975 MonoJitInfo *ji = frame->ji;
980 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
981 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
982 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
983 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
984 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
985 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
994 if (ss->count == ss->maximum)
997 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
999 /* continue down the stack */
1004 glist_to_array (GList *list, MonoClass *eclass)
1006 MonoDomain *domain = mono_domain_get ();
1013 len = g_list_length (list);
1014 res = mono_array_new (domain, eclass, len);
1016 for (i = 0; list; list = list->next, i++)
1017 mono_array_set (res, gpointer, i, list->data);
1023 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1024 * @skip: the number of stack frames to skip
1026 * This function returns an managed array of containing the security
1027 * informations for each frame (after the skipped ones). This is used for
1028 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1032 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1034 MonoSecurityStack ss;
1036 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1042 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1043 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1044 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1045 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1050 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1052 MonoClass *catch_class = ei->data.catch_class;
1053 MonoType *inflated_type;
1054 MonoGenericContext context;
1056 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1057 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1060 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1062 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1064 /* FIXME: we shouldn't inflate but instead put the
1065 type in the rgctx and fetch it from there. It
1066 might be a good idea to do this lazily, i.e. only
1067 when the exception is actually thrown, so as not to
1068 waste space for exception clauses which might never
1070 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1071 catch_class = mono_class_from_mono_type (inflated_type);
1072 mono_metadata_free_type (inflated_type);
1078 * mini_jit_info_table_find:
1080 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1081 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1082 * OUT_DOMAIN if it is not NULL.
1085 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1088 MonoInternalThread *t = mono_thread_internal_current ();
1094 ji = mono_jit_info_table_find (domain, addr);
1097 *out_domain = domain;
1101 /* maybe it is shared code, so we also search in the root domain */
1102 if (domain != mono_get_root_domain ()) {
1103 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1106 *out_domain = mono_get_root_domain ();
1111 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1112 for (; refs && *refs; refs++) {
1113 if (*refs != domain && *refs != mono_get_root_domain ()) {
1114 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1117 *out_domain = (MonoDomain*) *refs;
1127 * wrap_non_exception_throws:
1129 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1130 * WrapNonExceptionThrows flag set.
1133 wrap_non_exception_throws (MonoMethod *m)
1135 MonoAssembly *ass = m->klass->image->assembly;
1136 MonoCustomAttrInfo* attrs;
1137 static MonoClass *klass;
1139 gboolean val = FALSE;
1142 if (ass->wrap_non_exception_throws_inited)
1143 return ass->wrap_non_exception_throws;
1145 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1147 attrs = mono_custom_attrs_from_assembly (ass);
1149 for (i = 0; i < attrs->num_attrs; ++i) {
1150 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1152 int len, num_named, named_type, data_type, name_len;
1155 if (!attr->ctor || attr->ctor->klass != klass)
1157 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1158 len = attr->data_size;
1159 p = (const char*)attr->data;
1160 g_assert (read16 (p) == 0x0001);
1162 num_named = read16 (p);
1171 if (named_type != 0x54)
1173 name_len = mono_metadata_decode_blob_size (p, &p);
1174 name = g_malloc (name_len + 1);
1175 memcpy (name, p, name_len);
1176 name [name_len] = 0;
1178 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1180 /* The value is a BOOLEAN */
1183 mono_custom_attrs_free (attrs);
1186 ass->wrap_non_exception_throws = val;
1187 mono_memory_barrier ();
1188 ass->wrap_non_exception_throws_inited = TRUE;
1193 #ifndef MONO_ARCH_STACK_GROWS_UP
1194 #define DOES_STACK_GROWS_UP 1
1196 #define DOES_STACK_GROWS_UP 0
1200 #define setup_managed_stacktrace_information() do { \
1201 if (mono_ex && !initial_trace_ips) { \
1202 trace_ips = g_list_reverse (trace_ips); \
1203 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1204 if (has_dynamic_methods) \
1205 /* These methods could go away anytime, so compute the stack trace now */ \
1206 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1208 g_list_free (trace_ips); \
1212 * mono_handle_exception_internal_first_pass:
1214 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1215 * OBJ is found. Run the index of the filter clause which caught the exception into
1216 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1219 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoObject *non_exception)
1221 MonoDomain *domain = mono_domain_get ();
1223 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1224 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1225 MonoLMF *lmf = mono_get_lmf ();
1226 MonoArray *initial_trace_ips = NULL;
1227 GList *trace_ips = NULL;
1228 MonoException *mono_ex;
1229 gboolean stack_overflow = FALSE;
1230 MonoContext initial_ctx;
1231 int frame_count = 0;
1232 gboolean has_dynamic_methods = FALSE;
1237 g_assert (ctx != NULL);
1239 if (obj == domain->stack_overflow_ex)
1240 stack_overflow = TRUE;
1242 mono_ex = (MonoException*)obj;
1243 initial_trace_ips = mono_ex->trace_ips;
1245 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1246 mono_ex = (MonoException*)obj;
1247 initial_trace_ips = mono_ex->trace_ips;
1253 call_filter = mono_get_call_filter ();
1255 g_assert (jit_tls->end_of_stack);
1256 g_assert (jit_tls->abort_func);
1259 *out_filter_idx = -1;
1266 MonoContext new_ctx;
1268 int clause_index_start = 0;
1269 gboolean unwind_res = TRUE;
1271 StackFrameInfo frame;
1273 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1275 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1279 g_assert (frame.type == FRAME_TYPE_MANAGED);
1284 setup_managed_stacktrace_information ();
1289 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1291 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1292 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1293 "The native frame called the managed method:\n%s\n",
1294 mono_method_full_name (ji->method, TRUE));
1297 if (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1299 * Avoid overwriting the stack trace if the exception is
1300 * rethrown. Also avoid giant stack traces during a stack
1303 if (!initial_trace_ips && (frame_count < 1000)) {
1304 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1305 trace_ips = g_list_prepend (trace_ips,
1306 get_generic_info_from_stack_frame (ji, ctx));
1310 if (ji->method->dynamic)
1311 has_dynamic_methods = TRUE;
1313 if (stack_overflow) {
1314 if (DOES_STACK_GROWS_UP)
1315 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1317 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1319 free_stack = 0xffffff;
1322 for (i = clause_index_start; i < ji->num_clauses; i++) {
1323 MonoJitExceptionInfo *ei = &ji->clauses [i];
1324 gboolean filtered = FALSE;
1327 * During stack overflow, wait till the unwinding frees some stack
1328 * space before running handlers/finalizers.
1330 if (free_stack <= (64 * 1024))
1333 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1335 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1338 * Have to unwrap RuntimeWrappedExceptions if the
1339 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1341 if (non_exception && !wrap_non_exception_throws (ji->method))
1342 ex_obj = non_exception;
1346 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1347 gboolean is_user_frame = ji->method->wrapper_type == MONO_WRAPPER_NONE || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1348 mono_perfcounters->exceptions_filters++;
1349 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1352 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1353 trim the stackframe since if it returns FALSE we lose information.
1355 FIXME Not 100% sure if it's a good idea even with user clauses.
1358 setup_managed_stacktrace_information ();
1360 if (ji->from_llvm) {
1361 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1362 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1364 g_assert_not_reached ();
1367 /* store the exception object in bp + ei->exvar_offset */
1368 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1371 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1372 filtered = call_filter (ctx, ei->data.filter);
1373 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1374 if (filtered && out_filter_idx)
1375 *out_filter_idx = filter_idx;
1382 setup_managed_stacktrace_information ();
1383 /* mono_debugger_agent_handle_exception () needs this */
1384 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1389 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1390 setup_managed_stacktrace_information ();
1395 /* mono_debugger_agent_handle_exception () needs this */
1396 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1405 g_assert_not_reached ();
1409 * mono_handle_exception_internal:
1410 * @ctx: saved processor state
1411 * @obj: the exception object
1412 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1415 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1417 MonoDomain *domain = mono_domain_get ();
1419 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1420 static void (*restore_context) (void *);
1421 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1422 MonoLMF *lmf = mono_get_lmf ();
1423 MonoException *mono_ex;
1424 gboolean stack_overflow = FALSE;
1425 MonoContext initial_ctx;
1426 int frame_count = 0;
1427 gint32 filter_idx, first_filter_idx;
1430 MonoObject *non_exception = NULL;
1432 g_assert (ctx != NULL);
1434 MonoException *ex = mono_get_exception_null_reference ();
1435 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1436 obj = (MonoObject *)ex;
1440 * Allocate a new exception object instead of the preconstructed ones.
1442 if (obj == domain->stack_overflow_ex) {
1444 * It is not a good idea to try and put even more pressure on the little stack available.
1445 * obj = mono_get_exception_stack_overflow ();
1447 stack_overflow = TRUE;
1449 else if (obj == domain->null_reference_ex) {
1450 obj = mono_get_exception_null_reference ();
1453 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1454 non_exception = obj;
1455 obj = mono_get_exception_runtime_wrapped (obj);
1458 mono_ex = (MonoException*)obj;
1460 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1461 mono_ex = (MonoException*)obj;
1466 if (mono_ex && jit_tls->class_cast_from) {
1467 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1468 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1469 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1470 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1471 mono_ex->message = mono_string_new (domain, msg);
1476 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1477 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1478 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1479 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1480 mono_ex->message = mono_string_new (domain, msg);
1488 call_filter = mono_get_call_filter ();
1490 if (!restore_context)
1491 restore_context = mono_get_restore_context ();
1493 g_assert (jit_tls->end_of_stack);
1494 g_assert (jit_tls->abort_func);
1497 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1498 * end up being TRUE on any code path.
1500 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1505 MonoContext ctx_cp = *ctx;
1506 if (mono_trace_is_enabled ()) {
1507 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1508 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1509 MonoObject *message;
1510 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1512 MonoObject *exc = NULL;
1513 if (get_message == NULL) {
1515 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1517 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1519 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1523 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1525 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1527 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1528 mono_print_thread_dump_from_ctx (ctx);
1530 jit_tls->orig_ex_ctx_set = TRUE;
1531 mono_profiler_exception_thrown (obj);
1532 jit_tls->orig_ex_ctx_set = FALSE;
1534 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, non_exception);
1537 if (mini_get_debug_options ()->break_on_exc)
1539 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1541 if (mini_get_debug_options ()->suspend_on_unhandled) {
1542 fprintf (stderr, "Unhandled exception, suspending...");
1547 // FIXME: This runs managed code so it might cause another stack overflow when
1548 // we are handling a stack overflow
1549 mono_unhandled_exception (obj);
1552 // Treat exceptions that are "handled" by mono_runtime_invoke() as unhandled.
1555 if (ji && ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)
1556 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1558 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1568 MonoContext new_ctx;
1570 int clause_index_start = 0;
1571 gboolean unwind_res = TRUE;
1575 ji = jit_tls->resume_state.ji;
1576 new_ctx = jit_tls->resume_state.new_ctx;
1577 clause_index_start = jit_tls->resume_state.clause_index;
1578 lmf = jit_tls->resume_state.lmf;
1579 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1580 filter_idx = jit_tls->resume_state.filter_idx;
1582 StackFrameInfo frame;
1584 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1586 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1590 g_assert (frame.type == FRAME_TYPE_MANAGED);
1596 *(mono_get_lmf_addr ()) = lmf;
1598 jit_tls->abort_func (obj);
1599 g_assert_not_reached ();
1603 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1605 if (stack_overflow) {
1606 if (DOES_STACK_GROWS_UP)
1607 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1609 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1611 free_stack = 0xffffff;
1614 for (i = clause_index_start; i < ji->num_clauses; i++) {
1615 MonoJitExceptionInfo *ei = &ji->clauses [i];
1616 gboolean filtered = FALSE;
1619 * During stack overflow, wait till the unwinding frees some stack
1620 * space before running handlers/finalizers.
1622 if (free_stack <= (64 * 1024))
1625 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1627 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1630 * Have to unwrap RuntimeWrappedExceptions if the
1631 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1633 if (non_exception && !wrap_non_exception_throws (ji->method))
1634 ex_obj = non_exception;
1638 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1639 if (ji->from_llvm) {
1640 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1641 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1643 g_assert_not_reached ();
1646 /* store the exception object in bp + ei->exvar_offset */
1647 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1651 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1653 * Filter clauses should only be run in the
1654 * first pass of exception handling.
1656 filtered = (filter_idx == first_filter_idx);
1660 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1661 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1663 * This guards against the situation that we abort a thread that is executing a finally clause
1664 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1665 * check for this situation here and resume interruption if we are below the guarded block.
1667 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1668 gboolean is_outside = FALSE;
1669 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1670 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1671 //FIXME make this stack direction aware
1672 if (catch_bp > prot_bp) {
1674 } else if (catch_bp == prot_bp) {
1675 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1676 * So we check if the catch handler_start is protected by the guarded handler protected region
1679 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1680 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1681 * There aren't any further finally/fault handler blocks down the stack over this exception.
1682 * This must be ensured by the code that installs the guard trampoline.
1684 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1686 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1691 jit_tls->handler_block_return_address = NULL;
1692 jit_tls->handler_block = NULL;
1693 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1697 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1698 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1699 jit_tls->orig_ex_ctx_set = TRUE;
1700 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1701 jit_tls->orig_ex_ctx_set = FALSE;
1702 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1703 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1704 *(mono_get_lmf_addr ()) = lmf;
1705 mono_perfcounters->exceptions_depth += frame_count;
1706 if (obj == domain->stack_overflow_ex)
1707 jit_tls->handling_stack_ovf = FALSE;
1711 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1712 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1713 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1714 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1715 jit_tls->orig_ex_ctx_set = TRUE;
1716 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1717 jit_tls->orig_ex_ctx_set = FALSE;
1718 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1719 call_filter (ctx, ei->handler_start);
1721 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1722 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1723 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1724 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1725 jit_tls->orig_ex_ctx_set = TRUE;
1726 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1727 jit_tls->orig_ex_ctx_set = FALSE;
1728 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1729 mono_perfcounters->exceptions_finallys++;
1730 *(mono_get_lmf_addr ()) = lmf;
1731 if (ji->from_llvm) {
1733 * LLVM compiled finally handlers follow the design
1734 * of the c++ ehabi, i.e. they call a resume function
1735 * at the end instead of returning to the caller.
1736 * So save the exception handling state,
1737 * mono_resume_unwind () will call us again to continue
1740 jit_tls->resume_state.ex_obj = obj;
1741 jit_tls->resume_state.ji = ji;
1742 jit_tls->resume_state.clause_index = i + 1;
1743 jit_tls->resume_state.ctx = *ctx;
1744 jit_tls->resume_state.new_ctx = new_ctx;
1745 jit_tls->resume_state.lmf = lmf;
1746 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1747 jit_tls->resume_state.filter_idx = filter_idx;
1748 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1751 call_filter (ctx, ei->handler_start);
1757 jit_tls->orig_ex_ctx_set = TRUE;
1758 mono_profiler_exception_method_leave (ji->method);
1759 jit_tls->orig_ex_ctx_set = FALSE;
1764 g_assert_not_reached ();
1768 * mono_debugger_handle_exception:
1770 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1771 * at the exception and FALSE to resume with the normal exception handling.
1773 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1774 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1775 * `callq throw' instruction.
1778 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1780 MonoDebuggerExceptionAction action;
1782 if (!mono_debug_using_mono_debugger ())
1786 MonoException *ex = mono_get_exception_null_reference ();
1787 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1788 obj = (MonoObject *)ex;
1791 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1793 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1795 * The debugger wants us to stop on the `throw' instruction.
1796 * By the time we get here, it already inserted a breakpoint there.
1799 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1800 MonoContext ctx_cp = *ctx;
1801 MonoJitInfo *ji = NULL;
1805 * The debugger wants us to stop only if this exception is user-unhandled.
1808 ret = mono_handle_exception_internal_first_pass (&ctx_cp, obj, NULL, &ji, NULL);
1809 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1811 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1812 * inside the method being invoked, so we handle it like a user-unhandled exception.
1819 * The exception is user-unhandled - tell the debugger to stop.
1821 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1825 * The exception is catched somewhere - resume with the normal exception handling and don't
1826 * stop in the debugger.
1834 * mono_debugger_run_finally:
1835 * @start_ctx: saved processor state
1837 * This method is called by the Mono Debugger to call all `finally' clauses of the
1838 * current stack frame. It's used when the user issues a `return' command to make
1839 * the current stack frame return. After returning from this method, the debugger
1840 * unwinds the stack one frame and gives control back to the user.
1842 * NOTE: This method is only used when running inside the Mono Debugger.
1845 mono_debugger_run_finally (MonoContext *start_ctx)
1847 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1848 MonoDomain *domain = mono_domain_get ();
1849 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1850 MonoLMF *lmf = mono_get_lmf ();
1851 MonoContext ctx, new_ctx;
1852 MonoJitInfo *ji, rji;
1857 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1858 if (!ji || ji == (gpointer)-1)
1862 call_filter = mono_get_call_filter ();
1864 for (i = 0; i < ji->num_clauses; i++) {
1865 MonoJitExceptionInfo *ei = &ji->clauses [i];
1867 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1868 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1869 call_filter (&ctx, ei->handler_start);
1875 * mono_handle_exception:
1876 * @ctx: saved processor state
1877 * @obj: the exception object
1880 mono_handle_exception (MonoContext *ctx, gpointer obj)
1882 mono_perfcounters->exceptions_thrown++;
1884 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1887 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1889 #ifndef MONO_ARCH_USE_SIGACTION
1890 #error "Can't use sigaltstack without sigaction"
1893 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1896 mono_setup_altstack (MonoJitTlsData *tls)
1900 guint8 *staddr = NULL;
1902 if (mono_running_on_valgrind ())
1905 mono_thread_get_stack_bounds (&staddr, &stsize);
1909 tls->end_of_stack = staddr + stsize;
1910 tls->stack_size = stsize;
1912 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1914 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1915 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1917 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1919 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1920 /* mprotect can fail for the main thread stack */
1921 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);
1922 g_assert (gaddr == tls->stack_ovf_guard_base);
1923 tls->stack_ovf_valloced = TRUE;
1926 /* Setup an alternate signal stack */
1927 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1928 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1930 g_assert (tls->signal_stack);
1932 sa.ss_sp = tls->signal_stack;
1933 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1937 sa.ss_flags = SS_ONSTACK;
1939 g_assert (sigaltstack (&sa, NULL) == 0);
1943 mono_free_altstack (MonoJitTlsData *tls)
1948 sa.ss_sp = tls->signal_stack;
1949 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1950 sa.ss_flags = SS_DISABLE;
1951 err = sigaltstack (&sa, NULL);
1952 g_assert (err == 0);
1954 if (tls->signal_stack)
1955 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1956 if (tls->stack_ovf_valloced)
1957 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1959 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1962 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1965 mono_setup_altstack (MonoJitTlsData *tls)
1970 mono_free_altstack (MonoJitTlsData *tls)
1974 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1977 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1979 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1980 /* we need to leave some room for throwing the exception */
1981 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1982 unprotect_size -= mono_pagesize ();
1983 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1984 * is sufficient stack
1986 //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);
1988 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1989 return unprotect_size == jit_tls->stack_ovf_guard_size;
1992 static G_GNUC_UNUSED void
1993 try_more_restore (void)
1995 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1996 if (try_restore_stack_protection (jit_tls, 500))
1997 jit_tls->restore_stack_prot = NULL;
2000 static G_GNUC_UNUSED void
2001 restore_stack_protection (void)
2003 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2004 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2005 /* if we can't restore the stack protection, keep a callback installed so
2006 * we'll try to restore as much stack as we can at each return from unmanaged
2009 if (try_restore_stack_protection (jit_tls, 4096))
2010 jit_tls->restore_stack_prot = NULL;
2012 jit_tls->restore_stack_prot = try_more_restore_tramp;
2013 /* here we also throw a stack overflow exception */
2014 ex->trace_ips = NULL;
2015 ex->stack_trace = NULL;
2016 mono_raise_exception (ex);
2020 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2022 void (*func)(void) = (gpointer)tramp_data;
2028 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2030 /* we got a stack overflow in the soft-guard pages
2031 * There are two cases:
2032 * 1) managed code caused the overflow: we unprotect the soft-guard page
2033 * and let the arch-specific code trigger the exception handling mechanism
2034 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2035 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2036 * and hope we can continue with those enabled, at least until the hard-guard page
2037 * is hit. The alternative to continuing here is to just print a message and abort.
2038 * We may add in the future the code to protect the pages again in the codepath
2039 * when we return from unmanaged to managed code.
2041 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2042 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2043 /* we unprotect the minimum amount we can */
2045 gboolean handled = FALSE;
2047 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2048 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2049 guard_size -= mono_pagesize ();
2051 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2052 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2053 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);
2054 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2056 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
2061 /* We print a message: after this even managed stack overflows
2062 * may crash the runtime
2064 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
2065 if (!jit_tls->handling_stack_ovf) {
2066 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2067 jit_tls->handling_stack_ovf = 1;
2069 /*fprintf (stderr, "Already handling stack overflow\n");*/
2079 MonoMethod *omethod;
2081 } PrintOverflowUserData;
2084 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2086 MonoMethod *method = NULL;
2087 PrintOverflowUserData *user_data = data;
2088 FILE *stream = user_data->stream;
2092 method = frame->ji->method;
2095 if (user_data->count == 0) {
2096 /* The first frame is in its prolog, so a line number cannot be computed */
2097 user_data->count ++;
2101 /* If this is a one method overflow, skip the other instances */
2102 if (method == user_data->omethod)
2105 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2106 fprintf (stream, " %s\n", location);
2109 if (user_data->count == 1) {
2110 fprintf (stream, " <...>\n");
2111 user_data->omethod = method;
2113 user_data->omethod = NULL;
2116 user_data->count ++;
2118 fprintf (stream, " at <unknown> <0x%05x>\n", frame->native_offset);
2124 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2126 PrintOverflowUserData ud;
2129 /* we don't do much now, but we can warn the user with a useful message */
2130 fprintf (stderr, "Stack overflow: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
2132 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2133 mono_arch_sigctx_to_monoctx (ctx, &mctx);
2135 fprintf (stderr, "Stacktrace:\n");
2137 memset (&ud, 0, sizeof (ud));
2140 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2142 if (ji && ji->method)
2143 fprintf (stderr, "At %s\n", mono_method_full_name (ji->method, TRUE));
2145 fprintf (stderr, "At <unmanaged>.\n");
2152 print_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2154 FILE *stream = (FILE*)data;
2155 MonoMethod *method = NULL;
2157 method = frame->ji->method;
2160 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2161 fprintf (stream, " %s\n", location);
2164 fprintf (stream, " at <unknown> <0x%05x>\n", frame->native_offset);
2169 static G_GNUC_UNUSED gboolean
2170 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2172 GString *p = (GString*)data;
2173 MonoMethod *method = NULL;
2175 method = frame->ji->method;
2178 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2179 g_string_append_printf (p, " %s\n", location);
2182 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2187 static gboolean handling_sigsegv = FALSE;
2190 * mono_handle_native_sigsegv:
2192 * Handle a SIGSEGV received while in native code by printing diagnostic
2193 * information and aborting.
2196 mono_handle_native_sigsegv (int signal, void *ctx)
2198 #ifdef MONO_ARCH_USE_SIGACTION
2199 struct sigaction sa;
2201 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2203 if (handling_sigsegv)
2206 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2207 fprintf (stderr, "Received SIGSEGV, suspending...");
2212 /* To prevent infinite loops when the stack walk causes a crash */
2213 handling_sigsegv = TRUE;
2215 /* !jit_tls means the thread was not registered with the runtime */
2216 if (jit_tls && mono_thread_internal_current ()) {
2217 fprintf (stderr, "Stacktrace:\n\n");
2219 mono_walk_stack (print_stack_frame, TRUE, stderr);
2224 #ifdef HAVE_BACKTRACE_SYMBOLS
2229 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2231 fprintf (stderr, "\nNative stacktrace:\n\n");
2233 size = backtrace (array, 256);
2234 names = backtrace_symbols (array, size);
2235 for (i =0; i < size; ++i) {
2236 fprintf (stderr, "\t%s\n", names [i]);
2242 /* Try to get more meaningful information using gdb */
2244 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2245 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
2246 /* From g_spawn_command_line_sync () in eglib */
2249 pid_t crashed_pid = getpid ();
2253 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2254 * it will deadlock. Call the syscall directly instead.
2256 pid = mono_runtime_syscall_fork ();
2259 dup2 (STDERR_FILENO, STDOUT_FILENO);
2261 mono_gdb_render_native_backtraces (crashed_pid);
2265 fprintf (stderr, "\nDebug info from gdb:\n\n");
2266 waitpid (pid, &status, 0);
2270 * A SIGSEGV indicates something went very wrong so we can no longer depend
2271 * on anything working. So try to print out lots of diagnostics, starting
2272 * with ones which have a greater chance of working.
2276 "=================================================================\n"
2277 "Got a %s while executing native code. This usually indicates\n"
2278 "a fatal error in the mono runtime or one of the native libraries \n"
2279 "used by your application.\n"
2280 "=================================================================\n"
2286 #ifdef MONO_ARCH_USE_SIGACTION
2288 /* Remove our SIGABRT handler */
2289 sa.sa_handler = SIG_DFL;
2290 sigemptyset (&sa.sa_mask);
2293 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2301 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2303 MonoInternalThread *thread = mono_thread_internal_current ();
2304 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2307 GString* text = g_string_new (0);
2308 char *name, *wapi_desc;
2309 GError *error = NULL;
2312 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2314 g_string_append_printf (text, "\n\"%s\"", name);
2317 else if (thread->threadpool_thread)
2318 g_string_append (text, "\n\"<threadpool thread>\"");
2320 g_string_append (text, "\n\"<unnamed thread>\"");
2323 wapi_desc = wapi_current_thread_desc ();
2324 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2328 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2330 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2332 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2334 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2336 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2338 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2341 fprintf (stdout, "%s", text->str);
2343 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2344 OutputDebugStringA(text->str);
2347 g_string_free (text, TRUE);
2352 * mono_print_thread_dump:
2354 * Print information about the current thread to stdout.
2355 * SIGCTX can be NULL, allowing this to be called from gdb.
2358 mono_print_thread_dump (void *sigctx)
2360 mono_print_thread_dump_internal (sigctx, NULL);
2364 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2366 mono_print_thread_dump_internal (NULL, ctx);
2370 * mono_resume_unwind:
2372 * This is called by a trampoline from LLVM compiled finally clauses to continue
2376 mono_resume_unwind (MonoContext *ctx)
2378 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2379 static void (*restore_context) (MonoContext *);
2380 MonoContext new_ctx;
2382 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2383 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2386 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2388 if (!restore_context)
2389 restore_context = mono_get_restore_context ();
2391 restore_context (&new_ctx);
2394 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2399 MonoJitExceptionInfo *ei;
2400 } FindHandlerBlockData;
2403 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2407 FindHandlerBlockData *pdata = data;
2408 MonoJitInfo *ji = frame->ji;
2413 if (ji->method->wrapper_type)
2416 ip = MONO_CONTEXT_GET_IP (ctx);
2418 for (i = 0; i < ji->num_clauses; ++i) {
2419 MonoJitExceptionInfo *ei = ji->clauses + i;
2420 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2422 /*If ip points to the first instruction it means the handler block didn't start
2423 so we can leave its execution to the EH machinery*/
2424 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2436 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2439 MonoJitExceptionInfo *clause = NULL;
2442 ip = MONO_CONTEXT_GET_IP (ctx);
2444 for (i = 0; i < ji->num_clauses; ++i) {
2445 clause = &ji->clauses [i];
2446 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2448 if (clause->handler_start < ip && clause->data.handler_end > ip)
2452 /*no matching finally */
2453 if (i == ji->num_clauses)
2456 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2457 if (ip == clause->handler_start)
2460 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2464 * Finds the bottom handler block running and install a block guard if needed.
2465 * FIXME add full-aot support.
2468 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2470 FindHandlerBlockData data = { 0 };
2471 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2478 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2479 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2481 if (!jit_tls || jit_tls->handler_block_return_address)
2484 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_SIGNAL_SAFE, &data);
2489 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2491 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2492 if (resume_ip == NULL)
2495 jit_tls->handler_block_return_address = resume_ip;
2496 jit_tls->handler_block = data.ei;
2503 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2511 mono_set_cast_details (MonoClass *from, MonoClass *to)
2513 MonoJitTlsData *jit_tls = NULL;
2515 if (mini_get_debug_options ()->better_cast_details) {
2516 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2517 jit_tls->class_cast_from = from;
2518 jit_tls->class_cast_to = to;
2523 /*returns false if the thread is not attached*/
2525 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2527 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2528 MonoInternalThread *thread = mono_thread_internal_current ();
2529 if (!thread || !thread->jit_data) {
2535 mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx);
2537 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2538 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2540 g_error ("Use a null sigctx requires a working mono-context");
2543 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2544 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2545 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2549 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2555 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2557 MonoInternalThread *thread = mono_thread_internal_current ();
2558 if (!thread || !thread->jit_data) {
2564 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2565 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2566 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2571 /*returns false if the thread is not attached*/
2573 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2575 MonoInternalThread *thread = mono_thread_internal_current ();
2576 MONO_ARCH_CONTEXT_DEF
2578 mono_arch_flush_register_windows ();
2580 if (!thread || !thread->jit_data) {
2584 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2585 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2587 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2590 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2591 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2592 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2598 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2600 void (*restore_context) (MonoContext *);
2601 restore_context = mono_get_restore_context ();
2603 mono_handle_exception (ctx, exc);
2604 restore_context (ctx);
2607 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2609 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2611 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2612 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2613 jit_tls->ex_ctx = *ctx;
2615 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2617 g_error ("This target doesn't support mono_arch_setup_async_callback");