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/metadata/environment.h>
49 #include <mono/utils/mono-mmap.h>
50 #include <mono/utils/mono-logger-internal.h>
53 #include "debug-mini.h"
55 #include "debugger-agent.h"
57 #ifndef MONO_ARCH_CONTEXT_DEF
58 #define MONO_ARCH_CONTEXT_DEF
61 static gpointer restore_context_func, call_filter_func;
62 static gpointer throw_exception_func, rethrow_exception_func;
63 static gpointer throw_corlib_exception_func;
65 static gpointer try_more_restore_tramp = NULL;
66 static gpointer restore_stack_protection_tramp = NULL;
68 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
69 static gpointer unhandled_exception_hook_data = NULL;
71 static void try_more_restore (void);
72 static void restore_stack_protection (void);
73 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
74 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
75 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
78 mono_exceptions_init (void)
80 MonoRuntimeExceptionHandlingCallbacks cbs;
82 restore_context_func = mono_aot_get_trampoline ("restore_context");
83 call_filter_func = mono_aot_get_trampoline ("call_filter");
84 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
85 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
89 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
91 mono_save_trampoline_xdebug_info (info);
92 mono_tramp_info_free (info);
94 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
96 mono_save_trampoline_xdebug_info (info);
97 mono_tramp_info_free (info);
99 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
101 mono_save_trampoline_xdebug_info (info);
102 mono_tramp_info_free (info);
104 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
106 mono_save_trampoline_xdebug_info (info);
107 mono_tramp_info_free (info);
110 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
111 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
112 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
115 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
116 mono_arch_exceptions_init ();
118 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
119 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
120 cbs.mono_raise_exception = mono_get_throw_exception ();
121 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
122 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
123 mono_install_eh_callbacks (&cbs);
127 mono_get_throw_exception (void)
129 g_assert (throw_exception_func);
130 return throw_exception_func;
134 mono_get_rethrow_exception (void)
136 g_assert (rethrow_exception_func);
137 return rethrow_exception_func;
141 mono_get_call_filter (void)
143 g_assert (call_filter_func);
144 return call_filter_func;
148 mono_get_restore_context (void)
150 g_assert (restore_context_func);
151 return restore_context_func;
155 mono_get_throw_corlib_exception (void)
157 gpointer code = NULL;
160 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
161 if (throw_corlib_exception_func)
162 return throw_corlib_exception_func;
165 code = mono_aot_get_trampoline ("throw_corlib_exception");
167 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
169 mono_save_trampoline_xdebug_info (info);
170 mono_tramp_info_free (info);
174 mono_memory_barrier ();
176 throw_corlib_exception_func = code;
178 return throw_corlib_exception_func;
182 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
184 MonoTryBlockHoleTableJitInfo *table;
189 if (ei->try_start > ip || ip >= ei->try_end)
192 if (!ji->has_try_block_holes)
195 table = mono_jit_info_get_try_block_hole_table_info (ji);
196 offset = (guint32)((char*)ip - (char*)ji->code_start);
197 clause = (guint16)(ei - ji->clauses);
198 g_assert (clause < ji->num_clauses);
200 for (i = 0; i < table->num_holes; ++i) {
201 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
202 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
211 * Translate between the mono_arch_find_jit_info function and the old API.
214 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
215 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
217 StackFrameInfo frame;
220 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
222 /* Avoid costly table lookup during stack overflow */
223 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
226 ji = mini_jit_info_table_find (domain, ip, NULL);
231 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
235 /* Convert between the new and the old APIs */
236 switch (frame.type) {
237 case FRAME_TYPE_MANAGED:
241 case FRAME_TYPE_MANAGED_TO_NATIVE:
245 memset (res, 0, sizeof (MonoJitInfo));
246 res->method = frame.method;
249 case FRAME_TYPE_DEBUGGER_INVOKE: {
253 * The normal exception handling code can't handle this frame, so just
256 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
257 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
261 g_assert_not_reached ();
266 /* mono_find_jit_info:
268 * This function is used to gather information from @ctx. It return the
269 * MonoJitInfo of the corresponding function, unwinds one stack frame and
270 * stores the resulting context into @new_ctx. It also stores a string
271 * describing the stack location into @trace (if not NULL), and modifies
272 * the @lmf if necessary. @native_offset return the IP offset from the
273 * start of the function or -1 if that info is not available.
276 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
277 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
281 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
293 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
295 if (ji == (gpointer)-1)
298 if (managed2 || (ji && ji->method->wrapper_type)) {
299 const char *real_ip, *start;
302 start = (const char *)ji->code_start;
304 /* ctx->ip points into native code */
305 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
307 real_ip = (const char*)ip;
309 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
310 offset = real_ip - start;
315 *native_offset = offset;
318 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
322 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
325 char *fname = mono_method_full_name (res->method, TRUE);
326 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
335 * mono_find_jit_info_ext:
337 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
339 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
340 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
341 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
342 * to obtain the last managed frame.
343 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
344 * On return, it will be filled with the locations where callee saved registers are saved
345 * by the current frame. This is returned outside of StackFrameInfo because it can be
346 * quite large on some platforms.
349 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
350 MonoJitInfo *prev_ji, MonoContext *ctx,
351 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
352 mgreg_t **save_locations,
353 StackFrameInfo *frame)
356 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
358 MonoDomain *target_domain;
363 /* Avoid costly table lookup during stack overflow */
364 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
367 ji = mini_jit_info_table_find (domain, ip, &target_domain);
370 target_domain = domain;
373 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
375 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
379 if (frame->type == FRAME_TYPE_MANAGED) {
380 if (!frame->ji->method->wrapper_type || frame->ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
381 frame->managed = TRUE;
384 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
386 * This type of frame is just a marker, the caller should unwind once more to get the
387 * last managed frame.
390 frame->method = NULL;
393 frame->native_offset = -1;
394 frame->domain = target_domain;
398 if (frame->type == FRAME_TYPE_MANAGED)
399 frame->method = ji->method;
401 if (ji && (frame->managed || ji->method->wrapper_type)) {
402 const char *real_ip, *start;
404 start = (const char *)ji->code_start;
406 /* ctx->ip points into native code */
407 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
409 real_ip = (const char*)ip;
411 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
412 frame->native_offset = real_ip - start;
414 frame->native_offset = -1;
417 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
419 if (trace && frame->method) {
420 char *fname = mono_method_full_name (frame->method, TRUE);
421 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
430 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
432 MonoGenericJitInfo *gi;
435 if (!ji->has_generic_jit_info)
437 gi = mono_jit_info_get_generic_jit_info (ji);
443 * Search location list if available, it contains the precise location of the
444 * argument for every pc offset, even if the method was interrupted while it was in
448 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
451 for (i = 0; i < gi->nlocs; ++i) {
452 MonoDwarfLocListEntry *entry = &gi->locations [i];
454 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
456 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
458 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
462 g_assert (i < gi->nlocs);
465 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
467 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
471 if (mono_method_get_context (ji->method)->method_inst) {
473 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
476 /* Avoid returning a managed object */
477 MonoObject *this_obj = info;
479 return this_obj->vtable->klass;
483 static MonoGenericContext
484 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
486 MonoGenericContext context = { NULL, NULL };
487 MonoClass *class, *method_container_class;
489 g_assert (generic_info);
491 g_assert (ji->method->is_inflated);
492 if (mono_method_get_context (ji->method)->method_inst) {
493 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
495 class = mrgctx->class_vtable->klass;
496 context.method_inst = mrgctx->method_inst;
497 g_assert (context.method_inst);
498 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
499 MonoVTable *vtable = generic_info;
501 class = vtable->klass;
503 class = generic_info;
506 //g_assert (!ji->method->klass->generic_container);
507 if (ji->method->klass->generic_class)
508 method_container_class = ji->method->klass->generic_class->container_class;
510 method_container_class = ji->method->klass;
512 /* class might refer to a subclass of ji->method's class */
513 while (!(class == ji->method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
514 class = class->parent;
518 if (class->generic_class || class->generic_container)
519 context.class_inst = mini_class_get_context (class)->class_inst;
521 if (class->generic_class)
522 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
524 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
530 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
532 MonoGenericContext context;
535 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
537 context = get_generic_context_from_stack_frame (ji, generic_info);
539 method = mono_method_get_declaring_generic_method (ji->method);
540 method = mono_class_inflate_generic_method (method, &context);
546 ves_icall_System_Exception_get_trace (MonoException *ex)
548 MonoDomain *domain = mono_domain_get ();
550 MonoArray *ta = ex->trace_ips;
555 /* Exception is not thrown yet */
558 len = mono_array_length (ta) >> 1;
559 trace_str = g_string_new ("");
560 for (i = 0; i < len; i++) {
562 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
563 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
565 ji = mono_jit_info_table_find (domain, ip);
567 /* Unmanaged frame */
568 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
572 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
574 address = (char *)ip - (char *)ji->code_start;
575 location = mono_debug_print_stack_frame (
576 method, address, ex->object.vtable->domain);
578 g_string_append_printf (trace_str, "%s\n", location);
583 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
584 g_string_free (trace_str, TRUE);
590 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
592 MonoDomain *domain = mono_domain_get ();
594 MonoArray *ta = exc->trace_ips;
595 MonoDebugSourceLocation *location;
599 /* Exception is not thrown yet */
600 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
603 len = mono_array_length (ta) >> 1;
605 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
607 for (i = skip; i < len; i++) {
609 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
610 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
611 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
614 ji = mono_jit_info_table_find (domain, ip);
616 /* Unmanaged frame */
617 mono_array_setref (res, i, sf);
621 g_assert (ji != NULL);
623 method = get_method_from_stack_frame (ji, generic_info);
624 if (ji->method->wrapper_type) {
628 s = mono_method_full_name (method, TRUE);
629 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
633 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
634 sf->native_offset = (char *)ip - (char *)ji->code_start;
637 * mono_debug_lookup_source_location() returns both the file / line number information
638 * and the IL offset. Note that computing the IL offset is already an expensive
639 * operation, so we shouldn't call this method twice.
641 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
643 sf->il_offset = location->il_offset;
647 if (need_file_info) {
648 if (location && location->source_file) {
649 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
650 sf->line = location->row;
651 sf->column = location->column;
653 sf->line = sf->column = 0;
658 mono_debug_free_source_location (location);
659 mono_array_setref (res, i, sf);
666 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
669 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
670 if (jit_tls && jit_tls->orig_ex_ctx_set)
671 start_ctx = &jit_tls->orig_ex_ctx;
673 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
676 * mono_walk_stack_with_ctx:
678 * Unwind the current thread starting at @start_ctx.
680 * If @start_ctx is null, we capture the current context.
683 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
685 MonoContext extra_ctx;
686 MonoInternalThread *thread = mono_thread_internal_current ();
687 MONO_ARCH_CONTEXT_DEF
689 if (!thread || !thread->jit_data)
693 mono_arch_flush_register_windows ();
695 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
696 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
698 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
700 start_ctx = &extra_ctx;
703 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
707 * mono_walk_stack_with_state:
709 * Unwind a thread described by @state.
711 * State must be valid (state->valid == TRUE).
713 * If you are using this function to unwind another thread, make sure it is suspended.
715 * If @state is null, we capture the current context.
718 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
720 MonoThreadUnwindState extra_state;
722 if (!mono_thread_state_init_from_current (&extra_state))
724 state = &extra_state;
727 g_assert (state->valid);
729 mono_walk_stack_full (func,
731 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
732 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
733 state->unwind_data [MONO_UNWIND_DATA_LMF],
734 unwind_options, user_data);
738 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
740 MonoThreadUnwindState state;
741 if (!mono_thread_state_init_from_current (&state))
743 mono_walk_stack_with_state (func, &state, options, user_data);
747 * mono_walk_stack_full:
748 * @func: callback to call for each stack frame
749 * @domain: starting appdomain, can be NULL to use the current domain
750 * @unwind_options: what extra information the unwinder should gather
751 * @start_ctx: starting state of the stack walk, can be NULL.
752 * @thread: the thread whose stack to walk, can be NULL to use the current thread
753 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
754 * @user_data: data passed to the callback
756 * This function walks the stack of a thread, starting from the state
757 * represented by start_ctx. For each frame the callback
758 * function is called with the relevant info. The walk ends when no more
759 * managed stack frames are found or when the callback returns a TRUE value.
762 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
765 MonoContext ctx, new_ctx;
766 StackFrameInfo frame;
768 mgreg_t *reg_locations [MONO_MAX_IREGS];
769 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
770 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
772 g_assert (start_ctx);
775 /*The LMF will be null if the target have no managed frames.*/
776 /* g_assert (lmf); */
778 memcpy (&ctx, start_ctx, sizeof (MonoContext));
779 memset (reg_locations, 0, sizeof (reg_locations));
781 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
783 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
787 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
788 MonoDebugSourceLocation *source;
790 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
791 il_offset = source ? source->il_offset : -1;
792 mono_debug_free_source_location (source);
796 frame.il_offset = il_offset;
798 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
799 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
801 frame.actual_method = frame.method;
804 if (get_reg_locations)
805 frame.reg_locations = reg_locations;
807 if (func (&frame, &ctx, user_data))
810 if (get_reg_locations) {
811 for (i = 0; i < MONO_MAX_IREGS; ++i)
812 if (new_reg_locations [i])
813 reg_locations [i] = new_reg_locations [i];
821 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
822 MonoReflectionMethod **method,
823 gint32 *iloffset, gint32 *native_offset,
824 MonoString **file, gint32 *line, gint32 *column)
826 MonoDomain *domain = mono_domain_get ();
827 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
828 MonoLMF *lmf = mono_get_lmf ();
829 MonoJitInfo *ji = NULL;
830 MonoContext ctx, new_ctx;
831 MonoDebugSourceLocation *location;
832 MonoMethod *actual_method;
833 StackFrameInfo frame;
836 MONO_ARCH_CONTEXT_DEF;
838 mono_arch_flush_register_windows ();
840 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
841 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
843 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
849 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
853 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
857 *native_offset = frame.native_offset;
859 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
860 if (ji->method->wrapper_type != MONO_WRAPPER_NONE && ji->method->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && ji->method->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
865 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
867 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
869 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
871 *iloffset = location->il_offset;
875 if (need_file_info) {
877 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
878 *line = location->row;
879 *column = location->column;
886 mono_debug_free_source_location (location);
893 MonoSecurityFrame *frame;
894 } MonoFrameSecurityInfo;
897 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
899 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
900 MonoJitInfo *ji = frame->ji;
905 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
906 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
907 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
908 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
909 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
910 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
919 si->frame = mono_declsec_create_frame (frame->domain, ji);
921 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
926 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
927 * @skip: the number of stack frames to skip
929 * This function returns a the security informations of a single stack frame
930 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
931 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
935 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
937 MonoFrameSecurityInfo si;
942 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
944 return (si.skips == 0) ? si.frame : NULL;
956 grow_array (MonoSecurityStack *stack)
958 MonoDomain *domain = mono_domain_get ();
959 guint32 newsize = (stack->maximum << 1);
960 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
962 for (i=0; i < stack->maximum; i++) {
963 gpointer frame = mono_array_get (stack->stack, gpointer, i);
964 mono_array_setref (newstack, i, frame);
966 stack->maximum = newsize;
967 stack->stack = newstack;
971 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
973 MonoSecurityStack *ss = (MonoSecurityStack*) data;
974 MonoJitInfo *ji = frame->ji;
979 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
980 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
981 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
982 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
983 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
984 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
993 if (ss->count == ss->maximum)
996 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
998 /* continue down the stack */
1003 glist_to_array (GList *list, MonoClass *eclass)
1005 MonoDomain *domain = mono_domain_get ();
1012 len = g_list_length (list);
1013 res = mono_array_new (domain, eclass, len);
1015 for (i = 0; list; list = list->next, i++)
1016 mono_array_set (res, gpointer, i, list->data);
1022 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1023 * @skip: the number of stack frames to skip
1025 * This function returns an managed array of containing the security
1026 * informations for each frame (after the skipped ones). This is used for
1027 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1031 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1033 MonoSecurityStack ss;
1035 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1041 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1042 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1043 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1044 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1049 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1051 MonoClass *catch_class = ei->data.catch_class;
1052 MonoType *inflated_type;
1053 MonoGenericContext context;
1055 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1056 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1059 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1061 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1063 /* FIXME: we shouldn't inflate but instead put the
1064 type in the rgctx and fetch it from there. It
1065 might be a good idea to do this lazily, i.e. only
1066 when the exception is actually thrown, so as not to
1067 waste space for exception clauses which might never
1069 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1070 catch_class = mono_class_from_mono_type (inflated_type);
1071 mono_metadata_free_type (inflated_type);
1077 * mini_jit_info_table_find:
1079 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1080 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1081 * OUT_DOMAIN if it is not NULL.
1084 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1087 MonoInternalThread *t = mono_thread_internal_current ();
1093 ji = mono_jit_info_table_find (domain, addr);
1096 *out_domain = domain;
1100 /* maybe it is shared code, so we also search in the root domain */
1101 if (domain != mono_get_root_domain ()) {
1102 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1105 *out_domain = mono_get_root_domain ();
1110 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1111 for (; refs && *refs; refs++) {
1112 if (*refs != domain && *refs != mono_get_root_domain ()) {
1113 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1116 *out_domain = (MonoDomain*) *refs;
1126 * wrap_non_exception_throws:
1128 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1129 * WrapNonExceptionThrows flag set.
1132 wrap_non_exception_throws (MonoMethod *m)
1134 MonoAssembly *ass = m->klass->image->assembly;
1135 MonoCustomAttrInfo* attrs;
1136 static MonoClass *klass;
1138 gboolean val = FALSE;
1141 if (ass->wrap_non_exception_throws_inited)
1142 return ass->wrap_non_exception_throws;
1144 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1146 attrs = mono_custom_attrs_from_assembly (ass);
1148 for (i = 0; i < attrs->num_attrs; ++i) {
1149 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1151 int len, num_named, named_type, data_type, name_len;
1154 if (!attr->ctor || attr->ctor->klass != klass)
1156 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1157 len = attr->data_size;
1158 p = (const char*)attr->data;
1159 g_assert (read16 (p) == 0x0001);
1161 num_named = read16 (p);
1170 if (named_type != 0x54)
1172 name_len = mono_metadata_decode_blob_size (p, &p);
1173 name = g_malloc (name_len + 1);
1174 memcpy (name, p, name_len);
1175 name [name_len] = 0;
1177 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1179 /* The value is a BOOLEAN */
1182 mono_custom_attrs_free (attrs);
1185 ass->wrap_non_exception_throws = val;
1186 mono_memory_barrier ();
1187 ass->wrap_non_exception_throws_inited = TRUE;
1192 #ifndef MONO_ARCH_STACK_GROWS_UP
1193 #define DOES_STACK_GROWS_UP 1
1195 #define DOES_STACK_GROWS_UP 0
1198 #define MAX_UNMANAGED_BACKTRACE 128
1200 build_native_trace (void)
1202 /* This puppy only makes sense on mobile, IOW, ARM. */
1203 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1205 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1206 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1211 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1213 for (i = 0; i < size; i++)
1214 mono_array_set (res, gpointer, i, native_trace [i]);
1221 #define setup_managed_stacktrace_information() do { \
1222 if (mono_ex && !initial_trace_ips) { \
1223 trace_ips = g_list_reverse (trace_ips); \
1224 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1225 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1226 if (has_dynamic_methods) \
1227 /* These methods could go away anytime, so compute the stack trace now */ \
1228 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1230 g_list_free (trace_ips); \
1234 * mono_handle_exception_internal_first_pass:
1236 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1237 * OBJ is found. Run the index of the filter clause which caught the exception into
1238 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1241 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoObject *non_exception)
1243 MonoDomain *domain = mono_domain_get ();
1245 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1246 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1247 MonoLMF *lmf = mono_get_lmf ();
1248 MonoArray *initial_trace_ips = NULL;
1249 GList *trace_ips = NULL;
1250 MonoException *mono_ex;
1251 gboolean stack_overflow = FALSE;
1252 MonoContext initial_ctx;
1253 int frame_count = 0;
1254 gboolean has_dynamic_methods = FALSE;
1259 g_assert (ctx != NULL);
1261 if (obj == domain->stack_overflow_ex)
1262 stack_overflow = TRUE;
1264 mono_ex = (MonoException*)obj;
1265 initial_trace_ips = mono_ex->trace_ips;
1267 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1268 mono_ex = (MonoException*)obj;
1269 initial_trace_ips = mono_ex->trace_ips;
1275 call_filter = mono_get_call_filter ();
1277 g_assert (jit_tls->end_of_stack);
1278 g_assert (jit_tls->abort_func);
1281 *out_filter_idx = -1;
1288 MonoContext new_ctx;
1290 int clause_index_start = 0;
1291 gboolean unwind_res = TRUE;
1293 StackFrameInfo frame;
1295 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1297 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1301 g_assert (frame.type == FRAME_TYPE_MANAGED);
1306 setup_managed_stacktrace_information ();
1311 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1313 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1314 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1315 "The native frame called the managed method:\n%s\n",
1316 mono_method_full_name (ji->method, TRUE));
1319 if (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1321 * Avoid overwriting the stack trace if the exception is
1322 * rethrown. Also avoid giant stack traces during a stack
1325 if (!initial_trace_ips && (frame_count < 1000)) {
1326 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1327 trace_ips = g_list_prepend (trace_ips,
1328 get_generic_info_from_stack_frame (ji, ctx));
1332 if (ji->method->dynamic)
1333 has_dynamic_methods = TRUE;
1335 if (stack_overflow) {
1336 if (DOES_STACK_GROWS_UP)
1337 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1339 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1341 free_stack = 0xffffff;
1344 for (i = clause_index_start; i < ji->num_clauses; i++) {
1345 MonoJitExceptionInfo *ei = &ji->clauses [i];
1346 gboolean filtered = FALSE;
1349 * During stack overflow, wait till the unwinding frees some stack
1350 * space before running handlers/finalizers.
1352 if (free_stack <= (64 * 1024))
1355 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1357 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1360 * Have to unwrap RuntimeWrappedExceptions if the
1361 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1363 if (non_exception && !wrap_non_exception_throws (ji->method))
1364 ex_obj = non_exception;
1368 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1369 gboolean is_user_frame = ji->method->wrapper_type == MONO_WRAPPER_NONE || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1370 #ifndef DISABLE_PERFCOUNTERS
1371 mono_perfcounters->exceptions_filters++;
1373 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1376 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1377 trim the stackframe since if it returns FALSE we lose information.
1379 FIXME Not 100% sure if it's a good idea even with user clauses.
1382 setup_managed_stacktrace_information ();
1384 if (ji->from_llvm) {
1385 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1386 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1388 g_assert_not_reached ();
1391 /* store the exception object in bp + ei->exvar_offset */
1392 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1395 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1396 filtered = call_filter (ctx, ei->data.filter);
1397 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1398 if (filtered && out_filter_idx)
1399 *out_filter_idx = filter_idx;
1406 setup_managed_stacktrace_information ();
1407 /* mono_debugger_agent_handle_exception () needs this */
1408 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1413 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1414 setup_managed_stacktrace_information ();
1419 /* mono_debugger_agent_handle_exception () needs this */
1420 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1429 g_assert_not_reached ();
1433 * mono_handle_exception_internal:
1434 * @ctx: saved processor state
1435 * @obj: the exception object
1436 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1439 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1441 MonoDomain *domain = mono_domain_get ();
1443 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1444 static void (*restore_context) (void *);
1445 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1446 MonoLMF *lmf = mono_get_lmf ();
1447 MonoException *mono_ex;
1448 gboolean stack_overflow = FALSE;
1449 MonoContext initial_ctx;
1450 int frame_count = 0;
1451 gint32 filter_idx, first_filter_idx;
1454 MonoObject *non_exception = NULL;
1456 g_assert (ctx != NULL);
1458 MonoException *ex = mono_get_exception_null_reference ();
1459 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1460 obj = (MonoObject *)ex;
1464 * Allocate a new exception object instead of the preconstructed ones.
1466 if (obj == domain->stack_overflow_ex) {
1468 * It is not a good idea to try and put even more pressure on the little stack available.
1469 * obj = mono_get_exception_stack_overflow ();
1471 stack_overflow = TRUE;
1473 else if (obj == domain->null_reference_ex) {
1474 obj = mono_get_exception_null_reference ();
1477 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1478 non_exception = obj;
1479 obj = mono_get_exception_runtime_wrapped (obj);
1482 mono_ex = (MonoException*)obj;
1484 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1485 mono_ex = (MonoException*)obj;
1490 if (mono_ex && jit_tls->class_cast_from) {
1491 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1492 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1493 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1494 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1495 mono_ex->message = mono_string_new (domain, msg);
1500 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1501 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1502 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1503 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1504 mono_ex->message = mono_string_new (domain, msg);
1512 call_filter = mono_get_call_filter ();
1514 if (!restore_context)
1515 restore_context = mono_get_restore_context ();
1517 g_assert (jit_tls->end_of_stack);
1518 g_assert (jit_tls->abort_func);
1521 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1522 * end up being TRUE on any code path.
1524 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1529 MonoContext ctx_cp = *ctx;
1530 if (mono_trace_is_enabled ()) {
1531 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1532 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1533 MonoObject *message;
1534 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1536 MonoObject *exc = NULL;
1537 if (get_message == NULL) {
1539 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1541 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1543 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1547 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1549 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1551 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1552 mono_print_thread_dump_from_ctx (ctx);
1554 jit_tls->orig_ex_ctx_set = TRUE;
1555 mono_profiler_exception_thrown (obj);
1556 jit_tls->orig_ex_ctx_set = FALSE;
1558 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, non_exception);
1561 if (mini_get_debug_options ()->break_on_exc)
1563 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1565 if (mini_get_debug_options ()->suspend_on_unhandled) {
1566 mono_runtime_printf_err ("Unhandled exception, suspending...");
1571 // FIXME: This runs managed code so it might cause another stack overflow when
1572 // we are handling a stack overflow
1573 mono_unhandled_exception (obj);
1576 // Treat exceptions that are "handled" by mono_runtime_invoke() as unhandled.
1579 if (ji && ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)
1580 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1582 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1592 MonoContext new_ctx;
1594 int clause_index_start = 0;
1595 gboolean unwind_res = TRUE;
1599 ji = jit_tls->resume_state.ji;
1600 new_ctx = jit_tls->resume_state.new_ctx;
1601 clause_index_start = jit_tls->resume_state.clause_index;
1602 lmf = jit_tls->resume_state.lmf;
1603 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1604 filter_idx = jit_tls->resume_state.filter_idx;
1606 StackFrameInfo frame;
1608 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1610 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1614 g_assert (frame.type == FRAME_TYPE_MANAGED);
1620 *(mono_get_lmf_addr ()) = lmf;
1622 jit_tls->abort_func (obj);
1623 g_assert_not_reached ();
1627 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1629 if (stack_overflow) {
1630 if (DOES_STACK_GROWS_UP)
1631 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1633 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1635 free_stack = 0xffffff;
1638 for (i = clause_index_start; i < ji->num_clauses; i++) {
1639 MonoJitExceptionInfo *ei = &ji->clauses [i];
1640 gboolean filtered = FALSE;
1643 * During stack overflow, wait till the unwinding frees some stack
1644 * space before running handlers/finalizers.
1646 if (free_stack <= (64 * 1024))
1649 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1651 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1654 * Have to unwrap RuntimeWrappedExceptions if the
1655 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1657 if (non_exception && !wrap_non_exception_throws (ji->method))
1658 ex_obj = non_exception;
1662 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1663 if (ji->from_llvm) {
1664 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1665 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1667 g_assert_not_reached ();
1670 /* store the exception object in bp + ei->exvar_offset */
1671 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1675 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1677 * Filter clauses should only be run in the
1678 * first pass of exception handling.
1680 filtered = (filter_idx == first_filter_idx);
1684 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1685 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1687 * This guards against the situation that we abort a thread that is executing a finally clause
1688 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1689 * check for this situation here and resume interruption if we are below the guarded block.
1691 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1692 gboolean is_outside = FALSE;
1693 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1694 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1695 //FIXME make this stack direction aware
1696 if (catch_bp > prot_bp) {
1698 } else if (catch_bp == prot_bp) {
1699 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1700 * So we check if the catch handler_start is protected by the guarded handler protected region
1703 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1704 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1705 * There aren't any further finally/fault handler blocks down the stack over this exception.
1706 * This must be ensured by the code that installs the guard trampoline.
1708 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1710 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1715 jit_tls->handler_block_return_address = NULL;
1716 jit_tls->handler_block = NULL;
1717 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1721 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1722 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1723 jit_tls->orig_ex_ctx_set = TRUE;
1724 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1725 jit_tls->orig_ex_ctx_set = FALSE;
1726 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1727 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1728 *(mono_get_lmf_addr ()) = lmf;
1729 #ifndef DISABLE_PERFCOUNTERS
1730 mono_perfcounters->exceptions_depth += frame_count;
1732 if (obj == domain->stack_overflow_ex)
1733 jit_tls->handling_stack_ovf = FALSE;
1737 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1738 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1739 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1740 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1741 jit_tls->orig_ex_ctx_set = TRUE;
1742 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1743 jit_tls->orig_ex_ctx_set = FALSE;
1744 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1745 call_filter (ctx, ei->handler_start);
1747 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1748 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1749 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1750 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1751 jit_tls->orig_ex_ctx_set = TRUE;
1752 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1753 jit_tls->orig_ex_ctx_set = FALSE;
1754 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1755 #ifndef DISABLE_PERFCOUNTERS
1756 mono_perfcounters->exceptions_finallys++;
1758 *(mono_get_lmf_addr ()) = lmf;
1759 if (ji->from_llvm) {
1761 * LLVM compiled finally handlers follow the design
1762 * of the c++ ehabi, i.e. they call a resume function
1763 * at the end instead of returning to the caller.
1764 * So save the exception handling state,
1765 * mono_resume_unwind () will call us again to continue
1768 jit_tls->resume_state.ex_obj = obj;
1769 jit_tls->resume_state.ji = ji;
1770 jit_tls->resume_state.clause_index = i + 1;
1771 jit_tls->resume_state.ctx = *ctx;
1772 jit_tls->resume_state.new_ctx = new_ctx;
1773 jit_tls->resume_state.lmf = lmf;
1774 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1775 jit_tls->resume_state.filter_idx = filter_idx;
1776 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1779 call_filter (ctx, ei->handler_start);
1785 jit_tls->orig_ex_ctx_set = TRUE;
1786 mono_profiler_exception_method_leave (ji->method);
1787 jit_tls->orig_ex_ctx_set = FALSE;
1792 g_assert_not_reached ();
1796 * mono_debugger_handle_exception:
1798 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1799 * at the exception and FALSE to resume with the normal exception handling.
1801 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1802 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1803 * `callq throw' instruction.
1806 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1808 MonoDebuggerExceptionAction action;
1810 if (!mono_debug_using_mono_debugger ())
1814 MonoException *ex = mono_get_exception_null_reference ();
1815 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1816 obj = (MonoObject *)ex;
1819 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1821 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1823 * The debugger wants us to stop on the `throw' instruction.
1824 * By the time we get here, it already inserted a breakpoint there.
1827 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1828 MonoContext ctx_cp = *ctx;
1829 MonoJitInfo *ji = NULL;
1833 * The debugger wants us to stop only if this exception is user-unhandled.
1836 ret = mono_handle_exception_internal_first_pass (&ctx_cp, obj, NULL, &ji, NULL);
1837 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1839 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1840 * inside the method being invoked, so we handle it like a user-unhandled exception.
1847 * The exception is user-unhandled - tell the debugger to stop.
1849 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1853 * The exception is catched somewhere - resume with the normal exception handling and don't
1854 * stop in the debugger.
1862 * mono_debugger_run_finally:
1863 * @start_ctx: saved processor state
1865 * This method is called by the Mono Debugger to call all `finally' clauses of the
1866 * current stack frame. It's used when the user issues a `return' command to make
1867 * the current stack frame return. After returning from this method, the debugger
1868 * unwinds the stack one frame and gives control back to the user.
1870 * NOTE: This method is only used when running inside the Mono Debugger.
1873 mono_debugger_run_finally (MonoContext *start_ctx)
1875 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1876 MonoDomain *domain = mono_domain_get ();
1877 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1878 MonoLMF *lmf = mono_get_lmf ();
1879 MonoContext ctx, new_ctx;
1880 MonoJitInfo *ji, rji;
1885 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1886 if (!ji || ji == (gpointer)-1)
1890 call_filter = mono_get_call_filter ();
1892 for (i = 0; i < ji->num_clauses; i++) {
1893 MonoJitExceptionInfo *ei = &ji->clauses [i];
1895 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1896 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1897 call_filter (&ctx, ei->handler_start);
1903 * mono_handle_exception:
1904 * @ctx: saved processor state
1905 * @obj: the exception object
1908 mono_handle_exception (MonoContext *ctx, gpointer obj)
1910 #ifndef DISABLE_PERFCOUNTERS
1911 mono_perfcounters->exceptions_thrown++;
1914 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1917 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1919 #ifndef MONO_ARCH_USE_SIGACTION
1920 #error "Can't use sigaltstack without sigaction"
1923 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1926 mono_setup_altstack (MonoJitTlsData *tls)
1930 guint8 *staddr = NULL;
1932 if (mono_running_on_valgrind ())
1935 mono_thread_get_stack_bounds (&staddr, &stsize);
1939 tls->end_of_stack = staddr + stsize;
1940 tls->stack_size = stsize;
1942 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1944 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1945 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1947 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1949 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1950 /* mprotect can fail for the main thread stack */
1951 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);
1952 g_assert (gaddr == tls->stack_ovf_guard_base);
1953 tls->stack_ovf_valloced = TRUE;
1956 /* Setup an alternate signal stack */
1957 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1958 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1960 g_assert (tls->signal_stack);
1962 sa.ss_sp = tls->signal_stack;
1963 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1967 sa.ss_flags = SS_ONSTACK;
1969 g_assert (sigaltstack (&sa, NULL) == 0);
1971 mono_gc_register_altstack ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size, (char*)staddr + stsize - ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size), tls->signal_stack, tls->signal_stack_size);
1975 mono_free_altstack (MonoJitTlsData *tls)
1980 sa.ss_sp = tls->signal_stack;
1981 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1982 sa.ss_flags = SS_DISABLE;
1983 err = sigaltstack (&sa, NULL);
1984 g_assert (err == 0);
1986 if (tls->signal_stack)
1987 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1988 if (tls->stack_ovf_valloced)
1989 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1991 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1994 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1997 mono_setup_altstack (MonoJitTlsData *tls)
2002 mono_free_altstack (MonoJitTlsData *tls)
2006 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2009 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2011 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2012 /* we need to leave some room for throwing the exception */
2013 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2014 unprotect_size -= mono_pagesize ();
2015 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2016 * is sufficient stack
2018 //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);
2020 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2021 return unprotect_size == jit_tls->stack_ovf_guard_size;
2024 static G_GNUC_UNUSED void
2025 try_more_restore (void)
2027 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2028 if (try_restore_stack_protection (jit_tls, 500))
2029 jit_tls->restore_stack_prot = NULL;
2032 static G_GNUC_UNUSED void
2033 restore_stack_protection (void)
2035 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2036 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2037 /* if we can't restore the stack protection, keep a callback installed so
2038 * we'll try to restore as much stack as we can at each return from unmanaged
2041 if (try_restore_stack_protection (jit_tls, 4096))
2042 jit_tls->restore_stack_prot = NULL;
2044 jit_tls->restore_stack_prot = try_more_restore_tramp;
2045 /* here we also throw a stack overflow exception */
2046 ex->trace_ips = NULL;
2047 ex->stack_trace = NULL;
2048 mono_raise_exception (ex);
2052 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2054 void (*func)(void) = (gpointer)tramp_data;
2060 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2062 /* we got a stack overflow in the soft-guard pages
2063 * There are two cases:
2064 * 1) managed code caused the overflow: we unprotect the soft-guard page
2065 * and let the arch-specific code trigger the exception handling mechanism
2066 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2067 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2068 * and hope we can continue with those enabled, at least until the hard-guard page
2069 * is hit. The alternative to continuing here is to just print a message and abort.
2070 * We may add in the future the code to protect the pages again in the codepath
2071 * when we return from unmanaged to managed code.
2073 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2074 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2075 /* we unprotect the minimum amount we can */
2077 gboolean handled = FALSE;
2079 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2080 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2081 guard_size -= mono_pagesize ();
2083 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2084 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2085 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);
2086 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2088 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
2093 /* We print a message: after this even managed stack overflows
2094 * may crash the runtime
2096 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2097 if (!jit_tls->handling_stack_ovf) {
2098 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2099 jit_tls->handling_stack_ovf = 1;
2101 /*fprintf (stderr, "Already handling stack overflow\n");*/
2110 MonoMethod *omethod;
2112 } PrintOverflowUserData;
2115 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2117 MonoMethod *method = NULL;
2118 PrintOverflowUserData *user_data = data;
2122 method = frame->ji->method;
2125 if (user_data->count == 0) {
2126 /* The first frame is in its prolog, so a line number cannot be computed */
2127 user_data->count ++;
2131 /* If this is a one method overflow, skip the other instances */
2132 if (method == user_data->omethod)
2135 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2136 mono_runtime_printf_err (" %s", location);
2139 if (user_data->count == 1) {
2140 mono_runtime_printf_err (" <...>");
2141 user_data->omethod = method;
2143 user_data->omethod = NULL;
2146 user_data->count ++;
2148 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2154 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2156 PrintOverflowUserData ud;
2159 /* we don't do much now, but we can warn the user with a useful message */
2160 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2162 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2163 mono_arch_sigctx_to_monoctx (ctx, &mctx);
2165 mono_runtime_printf_err ("Stacktrace:");
2167 memset (&ud, 0, sizeof (ud));
2169 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2171 if (ji && ji->method)
2172 mono_runtime_printf_err ("At %s", mono_method_full_name (ji->method, TRUE));
2174 mono_runtime_printf_err ("At <unmanaged>.");
2181 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2183 MonoMethod *method = NULL;
2185 method = frame->ji->method;
2188 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2189 mono_runtime_printf_err (" %s", location);
2192 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2197 static G_GNUC_UNUSED gboolean
2198 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2200 GString *p = (GString*)data;
2201 MonoMethod *method = NULL;
2203 method = frame->ji->method;
2206 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2207 g_string_append_printf (p, " %s\n", location);
2210 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2215 static gboolean handling_sigsegv = FALSE;
2218 * mono_handle_native_sigsegv:
2220 * Handle a SIGSEGV received while in native code by printing diagnostic
2221 * information and aborting.
2224 mono_handle_native_sigsegv (int signal, void *ctx)
2226 #ifdef MONO_ARCH_USE_SIGACTION
2227 struct sigaction sa;
2229 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2231 if (handling_sigsegv)
2234 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2235 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2240 /* To prevent infinite loops when the stack walk causes a crash */
2241 handling_sigsegv = TRUE;
2243 /* !jit_tls means the thread was not registered with the runtime */
2244 if (jit_tls && mono_thread_internal_current ()) {
2245 mono_runtime_printf_err ("Stacktrace:\n");
2247 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2250 #ifdef HAVE_BACKTRACE_SYMBOLS
2255 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2257 mono_runtime_printf_err ("\nNative stacktrace:\n");
2259 size = backtrace (array, 256);
2260 names = backtrace_symbols (array, size);
2261 for (i =0; i < size; ++i) {
2262 mono_runtime_printf_err ("\t%s", names [i]);
2266 /* Try to get more meaningful information using gdb */
2268 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2269 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
2270 /* From g_spawn_command_line_sync () in eglib */
2273 pid_t crashed_pid = getpid ();
2277 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2278 * it will deadlock. Call the syscall directly instead.
2280 pid = mono_runtime_syscall_fork ();
2283 dup2 (STDERR_FILENO, STDOUT_FILENO);
2285 mono_gdb_render_native_backtraces (crashed_pid);
2289 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2290 waitpid (pid, &status, 0);
2294 * A SIGSEGV indicates something went very wrong so we can no longer depend
2295 * on anything working. So try to print out lots of diagnostics, starting
2296 * with ones which have a greater chance of working.
2298 mono_runtime_printf_err (
2300 "=================================================================\n"
2301 "Got a %s while executing native code. This usually indicates\n"
2302 "a fatal error in the mono runtime or one of the native libraries \n"
2303 "used by your application.\n"
2304 "=================================================================\n",
2310 #ifdef MONO_ARCH_USE_SIGACTION
2312 /* Remove our SIGABRT handler */
2313 sa.sa_handler = SIG_DFL;
2314 sigemptyset (&sa.sa_mask);
2317 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2325 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2327 MonoInternalThread *thread = mono_thread_internal_current ();
2328 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2331 GString* text = g_string_new (0);
2332 char *name, *wapi_desc;
2333 GError *error = NULL;
2336 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2338 g_string_append_printf (text, "\n\"%s\"", name);
2341 else if (thread->threadpool_thread)
2342 g_string_append (text, "\n\"<threadpool thread>\"");
2344 g_string_append (text, "\n\"<unnamed thread>\"");
2347 wapi_desc = wapi_current_thread_desc ();
2348 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2352 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2354 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2356 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2358 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2360 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2362 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2365 mono_runtime_printf ("%s", text->str);
2367 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2368 OutputDebugStringA(text->str);
2371 g_string_free (text, TRUE);
2372 mono_runtime_stdout_fflush ();
2376 * mono_print_thread_dump:
2378 * Print information about the current thread to stdout.
2379 * SIGCTX can be NULL, allowing this to be called from gdb.
2382 mono_print_thread_dump (void *sigctx)
2384 mono_print_thread_dump_internal (sigctx, NULL);
2388 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2390 mono_print_thread_dump_internal (NULL, ctx);
2394 * mono_resume_unwind:
2396 * This is called by a trampoline from LLVM compiled finally clauses to continue
2400 mono_resume_unwind (MonoContext *ctx)
2402 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2403 static void (*restore_context) (MonoContext *);
2404 MonoContext new_ctx;
2406 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2407 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2410 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2412 if (!restore_context)
2413 restore_context = mono_get_restore_context ();
2415 restore_context (&new_ctx);
2418 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2423 MonoJitExceptionInfo *ei;
2424 } FindHandlerBlockData;
2427 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2431 FindHandlerBlockData *pdata = data;
2432 MonoJitInfo *ji = frame->ji;
2437 if (ji->method->wrapper_type)
2440 ip = MONO_CONTEXT_GET_IP (ctx);
2442 for (i = 0; i < ji->num_clauses; ++i) {
2443 MonoJitExceptionInfo *ei = ji->clauses + i;
2444 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2446 /*If ip points to the first instruction it means the handler block didn't start
2447 so we can leave its execution to the EH machinery*/
2448 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2460 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2463 MonoJitExceptionInfo *clause = NULL;
2466 ip = MONO_CONTEXT_GET_IP (ctx);
2468 for (i = 0; i < ji->num_clauses; ++i) {
2469 clause = &ji->clauses [i];
2470 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2472 if (clause->handler_start < ip && clause->data.handler_end > ip)
2476 /*no matching finally */
2477 if (i == ji->num_clauses)
2480 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2481 if (ip == clause->handler_start)
2484 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2488 * Finds the bottom handler block running and install a block guard if needed.
2489 * FIXME add full-aot support.
2492 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2494 FindHandlerBlockData data = { 0 };
2495 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2502 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2503 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2505 if (!jit_tls || jit_tls->handler_block_return_address)
2508 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_SIGNAL_SAFE, &data);
2513 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2515 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2516 if (resume_ip == NULL)
2519 jit_tls->handler_block_return_address = resume_ip;
2520 jit_tls->handler_block = data.ei;
2527 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2535 mono_set_cast_details (MonoClass *from, MonoClass *to)
2537 MonoJitTlsData *jit_tls = NULL;
2539 if (mini_get_debug_options ()->better_cast_details) {
2540 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2541 jit_tls->class_cast_from = from;
2542 jit_tls->class_cast_to = to;
2547 /*returns false if the thread is not attached*/
2549 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2551 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2552 MonoInternalThread *thread = mono_thread_internal_current ();
2553 if (!thread || !thread->jit_data) {
2559 mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx);
2561 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2562 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2564 g_error ("Use a null sigctx requires a working mono-context");
2567 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2568 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2569 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2573 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2579 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2581 MonoInternalThread *thread = mono_thread_internal_current ();
2582 if (!thread || !thread->jit_data) {
2588 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2589 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2590 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2595 /*returns false if the thread is not attached*/
2597 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2599 MonoInternalThread *thread = mono_thread_internal_current ();
2600 MONO_ARCH_CONTEXT_DEF
2602 mono_arch_flush_register_windows ();
2604 if (!thread || !thread->jit_data) {
2608 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2609 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2611 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2614 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2615 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2616 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2622 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2624 void (*restore_context) (MonoContext *);
2625 restore_context = mono_get_restore_context ();
2627 mono_handle_exception (ctx, exc);
2628 restore_context (ctx);
2631 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2633 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2635 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2636 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2637 jit_tls->ex_ctx = *ctx;
2639 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2641 g_error ("This target doesn't support mono_arch_setup_async_callback");
2646 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2648 unhandled_exception_hook = func;
2649 unhandled_exception_hook_data = user_data;
2653 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2655 if (unhandled_exception_hook) {
2656 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2658 MonoObject *other = NULL;
2659 MonoString *str = mono_object_to_string (exc, &other);
2661 char *msg = mono_string_to_utf8 (str);
2662 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2666 #if defined(__APPLE__) && defined(__arm__)
2667 g_assertion_message ("Terminating runtime due to unhandled exception");
2669 exit (mono_environment_exitcode_get ());
2673 g_assert_not_reached ();