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).
21 #ifdef HAVE_EXECINFO_H
25 #ifdef HAVE_SYS_TYPES_H
26 #include <sys/types.h>
29 #ifdef HAVE_SYS_WAIT_H
37 #ifdef HAVE_SYS_SYSCALL_H
38 #include <sys/syscall.h>
41 #ifdef HAVE_SYS_PRCTL_H
42 #include <sys/prctl.h>
45 #include <mono/metadata/appdomain.h>
46 #include <mono/metadata/tabledefs.h>
47 #include <mono/metadata/threads.h>
48 #include <mono/metadata/threads-types.h>
49 #include <mono/metadata/debug-helpers.h>
50 #include <mono/metadata/exception.h>
51 #include <mono/metadata/gc-internal.h>
52 #include <mono/metadata/mono-debug.h>
53 #include <mono/metadata/profiler.h>
54 #include <mono/metadata/mono-endian.h>
55 #include <mono/metadata/environment.h>
56 #include <mono/utils/mono-mmap.h>
57 #include <mono/utils/mono-logger-internal.h>
61 #include "debugger-agent.h"
62 #include "seq-points.h"
64 #ifdef ENABLE_EXTENSION_MODULE
65 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
68 #ifndef MONO_ARCH_CONTEXT_DEF
69 #define MONO_ARCH_CONTEXT_DEF
72 static gpointer restore_context_func, call_filter_func;
73 static gpointer throw_exception_func, rethrow_exception_func;
74 static gpointer throw_corlib_exception_func;
76 static gpointer try_more_restore_tramp = NULL;
77 static gpointer restore_stack_protection_tramp = NULL;
79 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
80 static gpointer unhandled_exception_hook_data = NULL;
82 static void try_more_restore (void);
83 static void restore_stack_protection (void);
84 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
85 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
86 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
89 mono_exceptions_init (void)
91 MonoRuntimeExceptionHandlingCallbacks cbs;
93 restore_context_func = mono_aot_get_trampoline ("restore_context");
94 call_filter_func = mono_aot_get_trampoline ("call_filter");
95 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
96 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
100 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
101 mono_tramp_info_register (info, NULL);
102 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
103 mono_tramp_info_register (info, NULL);
104 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
105 mono_tramp_info_register (info, NULL);
106 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
107 mono_tramp_info_register (info, NULL);
109 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
110 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
111 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
114 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
115 mono_arch_exceptions_init ();
117 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
118 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
119 cbs.mono_raise_exception = mono_get_throw_exception ();
120 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
121 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
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);
168 mono_tramp_info_register (info, NULL);
171 mono_memory_barrier ();
173 throw_corlib_exception_func = code;
175 return throw_corlib_exception_func;
179 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
181 MonoTryBlockHoleTableJitInfo *table;
186 if (ei->try_start > ip || ip >= ei->try_end)
189 if (!ji->has_try_block_holes)
192 table = mono_jit_info_get_try_block_hole_table_info (ji);
193 offset = (guint32)((char*)ip - (char*)ji->code_start);
194 clause = (guint16)(ei - ji->clauses);
195 g_assert (clause < ji->num_clauses);
197 for (i = 0; i < table->num_holes; ++i) {
198 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
199 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
208 * Translate between the mono_arch_unwind_frame function and the old API.
211 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
212 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
214 StackFrameInfo frame;
217 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
219 /* Avoid costly table lookup during stack overflow */
220 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
223 ji = mini_jit_info_table_find (domain, ip, NULL);
228 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
232 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
234 * Remove any unused lmf.
235 * Mask out the lower bits which might be used to hold additional information.
237 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
240 /* Convert between the new and the old APIs */
241 switch (frame.type) {
242 case FRAME_TYPE_MANAGED:
246 case FRAME_TYPE_TRAMPOLINE:
248 case FRAME_TYPE_MANAGED_TO_NATIVE:
252 memset (res, 0, sizeof (MonoJitInfo));
253 res->d.method = frame.method;
256 case FRAME_TYPE_DEBUGGER_INVOKE: {
260 * The normal exception handling code can't handle this frame, so just
263 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
264 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
268 g_assert_not_reached ();
273 /* mono_find_jit_info:
275 * This function is used to gather information from @ctx. It return the
276 * MonoJitInfo of the corresponding function, unwinds one stack frame and
277 * stores the resulting context into @new_ctx. It also stores a string
278 * describing the stack location into @trace (if not NULL), and modifies
279 * the @lmf if necessary. @native_offset return the IP offset from the
280 * start of the function or -1 if that info is not available.
283 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
284 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
288 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
290 MonoMethod *method = NULL;
301 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
303 if (ji == (gpointer)-1)
306 if (ji && !ji->is_trampoline)
307 method = jinfo_get_method (ji);
309 if (managed2 || (method && method->wrapper_type)) {
310 const char *real_ip, *start;
313 start = (const char *)ji->code_start;
315 /* ctx->ip points into native code */
316 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
318 real_ip = (const char*)ip;
320 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
321 offset = real_ip - start;
326 *native_offset = offset;
329 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
333 *trace = mono_debug_print_stack_frame (method, offset, domain);
336 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
337 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
346 * mono_find_jit_info_ext:
348 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
350 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
351 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
352 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
353 * to obtain the last managed frame.
354 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
355 * On return, it will be filled with the locations where callee saved registers are saved
356 * by the current frame. This is returned outside of StackFrameInfo because it can be
357 * quite large on some platforms.
358 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
362 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
363 MonoJitInfo *prev_ji, MonoContext *ctx,
364 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
365 mgreg_t **save_locations,
366 StackFrameInfo *frame)
369 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
371 MonoDomain *target_domain = domain;
372 MonoMethod *method = NULL;
373 gboolean async = mono_thread_info_is_async_context ();
378 /* Avoid costly table lookup during stack overflow */
379 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
382 ji = mini_jit_info_table_find (domain, ip, &target_domain);
385 target_domain = domain;
388 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
390 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
394 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
396 * Remove any unused lmf.
397 * Mask out the lower bits which might be used to hold additional information.
399 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
402 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
403 method = jinfo_get_method (frame->ji);
405 if (frame->type == FRAME_TYPE_MANAGED && method) {
406 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
407 frame->managed = TRUE;
410 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
412 * This type of frame is just a marker, the caller should unwind once more to get the
413 * last managed frame.
416 frame->method = NULL;
419 frame->native_offset = -1;
420 frame->domain = target_domain;
421 frame->async_context = async;
425 if (frame->type == FRAME_TYPE_MANAGED)
426 frame->method = method;
428 if (ji && (frame->managed || (method && method->wrapper_type))) {
429 const char *real_ip, *start;
431 start = (const char *)ji->code_start;
433 /* ctx->ip points into native code */
434 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
436 real_ip = (const char*)ip;
438 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
439 frame->native_offset = real_ip - start;
441 frame->native_offset = -1;
444 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
446 if (trace && frame->method) {
447 char *fname = mono_method_full_name (frame->method, TRUE);
448 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
457 * This function is async-safe.
460 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
462 MonoGenericJitInfo *gi;
466 if (!ji->has_generic_jit_info)
468 gi = mono_jit_info_get_generic_jit_info (ji);
474 * Search location list if available, it contains the precise location of the
475 * argument for every pc offset, even if the method was interrupted while it was in
479 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
482 for (i = 0; i < gi->nlocs; ++i) {
483 MonoDwarfLocListEntry *entry = &gi->locations [i];
485 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
487 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
489 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
493 g_assert (i < gi->nlocs);
496 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
498 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
502 method = jinfo_get_method (ji);
503 if (mono_method_get_context (method)->method_inst) {
505 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
508 /* Avoid returning a managed object */
509 MonoObject *this_obj = info;
511 return this_obj->vtable->klass;
515 static MonoGenericContext
516 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
518 MonoGenericContext context = { NULL, NULL };
519 MonoClass *klass, *method_container_class;
522 g_assert (generic_info);
524 method = jinfo_get_method (ji);
525 g_assert (method->is_inflated);
526 if (mono_method_get_context (method)->method_inst) {
527 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
529 klass = mrgctx->class_vtable->klass;
530 context.method_inst = mrgctx->method_inst;
531 g_assert (context.method_inst);
532 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
533 MonoVTable *vtable = generic_info;
535 klass = vtable->klass;
537 klass = generic_info;
540 //g_assert (!method->klass->generic_container);
541 if (method->klass->generic_class)
542 method_container_class = method->klass->generic_class->container_class;
544 method_container_class = method->klass;
546 /* class might refer to a subclass of method's class */
547 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
548 klass = klass->parent;
552 if (klass->generic_class || klass->generic_container)
553 context.class_inst = mini_class_get_context (klass)->class_inst;
555 if (klass->generic_class)
556 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
558 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
564 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
567 MonoGenericContext context;
570 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
571 return jinfo_get_method (ji);
572 context = get_generic_context_from_stack_frame (ji, generic_info);
574 method = jinfo_get_method (ji);
575 method = mono_method_get_declaring_generic_method (method);
576 method = mono_class_inflate_generic_method_checked (method, &context, &error);
577 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
583 * mono_exception_walk_native_trace:
584 * @ex: The exception object whose frames should be walked
585 * @func: callback to call for each stack frame
586 * @user_data: data passed to the callback
588 * This function walks the stacktrace of an exception. For
589 * each frame the callback function is called with the relevant info.
590 * The walk ends when no more stack frames are found or when the callback
591 * returns a TRUE value.
595 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
597 MonoDomain *domain = mono_domain_get ();
598 MonoArray *ta = ex->trace_ips;
604 len = mono_array_length (ta) >> 1;
605 for (i = 0; i < len; i++) {
606 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
607 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
608 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
611 if (func (NULL, ip, 0, FALSE, user_data))
614 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
615 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
624 ves_icall_System_Exception_get_trace (MonoException *ex)
626 MonoDomain *domain = mono_domain_get ();
628 MonoArray *ta = ex->trace_ips;
633 /* Exception is not thrown yet */
636 len = mono_array_length (ta) >> 1;
637 trace_str = g_string_new ("");
638 for (i = 0; i < len; i++) {
640 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
641 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
643 ji = mono_jit_info_table_find_internal (domain, ip, TRUE, TRUE);
645 /* Unmanaged frame */
646 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
647 } else if (!ji->is_trampoline) {
650 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
652 address = (char *)ip - (char *)ji->code_start;
653 location = mono_debug_print_stack_frame (
654 method, address, ex->object.vtable->domain);
656 g_string_append_printf (trace_str, "%s\n", location);
661 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
662 g_string_free (trace_str, TRUE);
668 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
670 MonoDomain *domain = mono_domain_get ();
672 MonoArray *ta = exc->trace_ips;
673 MonoDebugSourceLocation *location;
677 /* Exception is not thrown yet */
678 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
681 len = mono_array_length (ta) >> 1;
683 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
685 for (i = skip; i < len; i++) {
687 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
688 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
689 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
692 ji = mono_jit_info_table_find (domain, ip);
694 /* Unmanaged frame */
695 mono_array_setref (res, i, sf);
699 g_assert (ji != NULL);
701 method = get_method_from_stack_frame (ji, generic_info);
702 if (jinfo_get_method (ji)->wrapper_type) {
706 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
707 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
711 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
713 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
714 sf->method_address = (gsize) ji->code_start;
715 sf->native_offset = (char *)ip - (char *)ji->code_start;
718 * mono_debug_lookup_source_location() returns both the file / line number information
719 * and the IL offset. Note that computing the IL offset is already an expensive
720 * operation, so we shouldn't call this method twice.
722 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
724 sf->il_offset = location->il_offset;
727 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
728 sf->il_offset = sp.il_offset;
733 if (need_file_info) {
734 if (location && location->source_file) {
735 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
736 sf->line = location->row;
737 sf->column = location->column;
739 sf->line = sf->column = 0;
744 mono_debug_free_source_location (location);
745 mono_array_setref (res, i, sf);
752 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
755 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
756 if (jit_tls && jit_tls->orig_ex_ctx_set)
757 start_ctx = &jit_tls->orig_ex_ctx;
759 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
762 * mono_walk_stack_with_ctx:
764 * Unwind the current thread starting at @start_ctx.
766 * If @start_ctx is null, we capture the current context.
769 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
771 MonoContext extra_ctx;
772 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
773 MONO_ARCH_CONTEXT_DEF
775 if (!thread || !thread->jit_data)
779 mono_arch_flush_register_windows ();
781 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
782 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
784 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
786 start_ctx = &extra_ctx;
789 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
793 * mono_walk_stack_with_state:
795 * Unwind a thread described by @state.
797 * State must be valid (state->valid == TRUE).
799 * If you are using this function to unwind another thread, make sure it is suspended.
801 * If @state is null, we capture the current context.
804 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
806 MonoThreadUnwindState extra_state;
808 g_assert (!mono_thread_info_is_async_context ());
809 if (!mono_thread_state_init_from_current (&extra_state))
811 state = &extra_state;
814 g_assert (state->valid);
816 mono_walk_stack_full (func,
818 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
819 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
820 state->unwind_data [MONO_UNWIND_DATA_LMF],
821 unwind_options, user_data);
825 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
827 MonoThreadUnwindState state;
828 if (!mono_thread_state_init_from_current (&state))
830 mono_walk_stack_with_state (func, &state, options, user_data);
834 * mono_walk_stack_full:
835 * @func: callback to call for each stack frame
836 * @domain: starting appdomain, can be NULL to use the current domain
837 * @unwind_options: what extra information the unwinder should gather
838 * @start_ctx: starting state of the stack walk, can be NULL.
839 * @thread: the thread whose stack to walk, can be NULL to use the current thread
840 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
841 * @user_data: data passed to the callback
843 * This function walks the stack of a thread, starting from the state
844 * represented by start_ctx. For each frame the callback
845 * function is called with the relevant info. The walk ends when no more
846 * managed stack frames are found or when the callback returns a TRUE value.
849 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
852 MonoContext ctx, new_ctx;
853 StackFrameInfo frame;
855 mgreg_t *reg_locations [MONO_MAX_IREGS];
856 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
857 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
858 gboolean async = mono_thread_info_is_async_context ();
860 g_assert (start_ctx);
863 /*The LMF will be null if the target have no managed frames.*/
864 /* g_assert (lmf); */
867 g_assert (unwind_options == MONO_UNWIND_NONE);
869 memcpy (&ctx, start_ctx, sizeof (MonoContext));
870 memset (reg_locations, 0, sizeof (reg_locations));
872 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
874 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
878 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
879 MonoDebugSourceLocation *source;
881 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
883 il_offset = source->il_offset;
886 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
887 il_offset = sp.il_offset;
891 mono_debug_free_source_location (source);
895 frame.il_offset = il_offset;
897 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
898 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
900 frame.actual_method = frame.method;
903 if (get_reg_locations)
904 frame.reg_locations = reg_locations;
906 if (func (&frame, &ctx, user_data))
909 if (get_reg_locations) {
910 for (i = 0; i < MONO_MAX_IREGS; ++i)
911 if (new_reg_locations [i])
912 reg_locations [i] = new_reg_locations [i];
920 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
921 MonoReflectionMethod **method,
922 gint32 *iloffset, gint32 *native_offset,
923 MonoString **file, gint32 *line, gint32 *column)
925 MonoDomain *domain = mono_domain_get ();
926 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
927 MonoLMF *lmf = mono_get_lmf ();
928 MonoJitInfo *ji = NULL;
929 MonoContext ctx, new_ctx;
930 MonoDebugSourceLocation *location;
931 MonoMethod *jmethod = NULL, *actual_method;
932 StackFrameInfo frame;
935 MONO_ARCH_CONTEXT_DEF;
937 mono_arch_flush_register_windows ();
939 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
940 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
942 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
948 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
952 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
953 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
954 frame.type == FRAME_TYPE_TRAMPOLINE)
958 *native_offset = frame.native_offset;
960 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
961 jmethod = jinfo_get_method (ji);
962 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
967 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
969 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
971 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
973 *iloffset = location->il_offset;
977 if (need_file_info) {
979 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
980 *line = location->row;
981 *column = location->column;
988 mono_debug_free_source_location (location);
994 glist_to_array (GList *list, MonoClass *eclass)
996 MonoDomain *domain = mono_domain_get ();
1003 len = g_list_length (list);
1004 res = mono_array_new (domain, eclass, len);
1006 for (i = 0; list; list = list->next, i++)
1007 mono_array_set (res, gpointer, i, list->data);
1013 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1015 MonoClass *catch_class = ei->data.catch_class;
1016 MonoType *inflated_type;
1017 MonoGenericContext context;
1019 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1020 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1023 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1025 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1027 /* FIXME: we shouldn't inflate but instead put the
1028 type in the rgctx and fetch it from there. It
1029 might be a good idea to do this lazily, i.e. only
1030 when the exception is actually thrown, so as not to
1031 waste space for exception clauses which might never
1033 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1034 catch_class = mono_class_from_mono_type (inflated_type);
1035 mono_metadata_free_type (inflated_type);
1041 * mini_jit_info_table_find_ext:
1043 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1044 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1045 * OUT_DOMAIN if it is not NULL.
1048 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1051 MonoInternalThread *t = mono_thread_internal_current ();
1057 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1060 *out_domain = domain;
1064 /* maybe it is shared code, so we also search in the root domain */
1065 if (domain != mono_get_root_domain ()) {
1066 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1069 *out_domain = mono_get_root_domain ();
1077 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1078 for (; refs && *refs; refs++) {
1079 if (*refs != domain && *refs != mono_get_root_domain ()) {
1080 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1083 *out_domain = (MonoDomain*) *refs;
1093 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1095 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1099 * wrap_non_exception_throws:
1101 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1102 * WrapNonExceptionThrows flag set.
1105 wrap_non_exception_throws (MonoMethod *m)
1107 MonoAssembly *ass = m->klass->image->assembly;
1108 MonoCustomAttrInfo* attrs;
1109 static MonoClass *klass;
1111 gboolean val = FALSE;
1114 if (ass->wrap_non_exception_throws_inited)
1115 return ass->wrap_non_exception_throws;
1117 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1119 attrs = mono_custom_attrs_from_assembly (ass);
1121 for (i = 0; i < attrs->num_attrs; ++i) {
1122 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1124 int num_named, named_type, name_len;
1127 if (!attr->ctor || attr->ctor->klass != klass)
1129 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1130 p = (const char*)attr->data;
1131 g_assert (read16 (p) == 0x0001);
1133 num_named = read16 (p);
1139 /* data_type = *p; */
1142 if (named_type != 0x54)
1144 name_len = mono_metadata_decode_blob_size (p, &p);
1145 name = g_malloc (name_len + 1);
1146 memcpy (name, p, name_len);
1147 name [name_len] = 0;
1149 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1151 /* The value is a BOOLEAN */
1154 mono_custom_attrs_free (attrs);
1157 ass->wrap_non_exception_throws = val;
1158 mono_memory_barrier ();
1159 ass->wrap_non_exception_throws_inited = TRUE;
1164 #ifndef MONO_ARCH_STACK_GROWS_UP
1165 #define DOES_STACK_GROWS_UP 1
1167 #define DOES_STACK_GROWS_UP 0
1170 #define MAX_UNMANAGED_BACKTRACE 128
1172 build_native_trace (void)
1174 /* This puppy only makes sense on mobile, IOW, ARM. */
1175 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1177 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1178 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1183 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1185 for (i = 0; i < size; i++)
1186 mono_array_set (res, gpointer, i, native_trace [i]);
1193 #define setup_managed_stacktrace_information() do { \
1194 if (mono_ex && !initial_trace_ips) { \
1195 trace_ips = g_list_reverse (trace_ips); \
1196 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1197 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1198 if (has_dynamic_methods) \
1199 /* These methods could go away anytime, so compute the stack trace now */ \
1200 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1202 g_list_free (trace_ips); \
1206 * mono_handle_exception_internal_first_pass:
1208 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1209 * OBJ is found. Run the index of the filter clause which caught the exception into
1210 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1213 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1215 MonoDomain *domain = mono_domain_get ();
1216 MonoJitInfo *ji = NULL;
1217 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1218 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1219 MonoLMF *lmf = mono_get_lmf ();
1220 MonoArray *initial_trace_ips = NULL;
1221 GList *trace_ips = NULL;
1222 MonoException *mono_ex;
1223 gboolean stack_overflow = FALSE;
1224 MonoContext initial_ctx;
1226 int frame_count = 0;
1227 gboolean has_dynamic_methods = FALSE;
1232 g_assert (ctx != NULL);
1234 if (obj == domain->stack_overflow_ex)
1235 stack_overflow = TRUE;
1237 mono_ex = (MonoException*)obj;
1238 initial_trace_ips = mono_ex->trace_ips;
1240 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1241 mono_ex = (MonoException*)obj;
1242 initial_trace_ips = mono_ex->trace_ips;
1248 call_filter = mono_get_call_filter ();
1250 g_assert (jit_tls->end_of_stack);
1251 g_assert (jit_tls->abort_func);
1254 *out_filter_idx = -1;
1258 *out_prev_ji = NULL;
1263 MonoContext new_ctx;
1265 int clause_index_start = 0;
1266 gboolean unwind_res = TRUE;
1268 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 ||
1276 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1277 frame.type == FRAME_TYPE_TRAMPOLINE) {
1281 g_assert (frame.type == FRAME_TYPE_MANAGED);
1286 setup_managed_stacktrace_information ();
1291 method = jinfo_get_method (ji);
1292 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1294 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1295 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1296 "The native frame called the managed method:\n%s\n",
1297 mono_method_full_name (method, TRUE));
1300 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1302 * Avoid overwriting the stack trace if the exception is
1303 * rethrown. Also avoid giant stack traces during a stack
1306 if (!initial_trace_ips && (frame_count < 1000)) {
1307 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1308 trace_ips = g_list_prepend (trace_ips,
1309 get_generic_info_from_stack_frame (ji, ctx));
1313 if (method->dynamic)
1314 has_dynamic_methods = TRUE;
1316 if (stack_overflow) {
1317 if (DOES_STACK_GROWS_UP)
1318 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1320 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1322 free_stack = 0xffffff;
1325 for (i = clause_index_start; i < ji->num_clauses; i++) {
1326 MonoJitExceptionInfo *ei = &ji->clauses [i];
1327 gboolean filtered = FALSE;
1330 * During stack overflow, wait till the unwinding frees some stack
1331 * space before running handlers/finalizers.
1333 if (free_stack <= (64 * 1024))
1336 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1338 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1341 * Have to unwrap RuntimeWrappedExceptions if the
1342 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1344 if (non_exception && !wrap_non_exception_throws (method))
1345 ex_obj = non_exception;
1349 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1350 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1351 #ifndef DISABLE_PERFCOUNTERS
1352 mono_perfcounters->exceptions_filters++;
1355 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1356 trim the stackframe since if it returns FALSE we lose information.
1358 FIXME Not 100% sure if it's a good idea even with user clauses.
1361 setup_managed_stacktrace_information ();
1363 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1365 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1367 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1368 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1370 g_assert (!ji->from_llvm);
1371 /* store the exception object in bp + ei->exvar_offset */
1372 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1375 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1377 * Pass the original il clause index to the landing pad so it can
1378 * branch to the landing pad associated with the il clause.
1379 * This is needed because llvm compiled code assumes that the EH
1380 * code always branches to the innermost landing pad.
1383 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1386 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1387 filtered = call_filter (ctx, ei->data.filter);
1388 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1389 if (filtered && out_filter_idx)
1390 *out_filter_idx = filter_idx;
1397 setup_managed_stacktrace_information ();
1398 /* mono_debugger_agent_handle_exception () needs this */
1399 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1404 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1405 setup_managed_stacktrace_information ();
1410 /* mono_debugger_agent_handle_exception () needs this */
1411 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1420 g_assert_not_reached ();
1424 * mono_handle_exception_internal:
1425 * @ctx: saved processor state
1426 * @obj: the exception object
1427 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1430 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1432 MonoDomain *domain = mono_domain_get ();
1433 MonoJitInfo *ji, *prev_ji;
1434 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1435 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1436 MonoLMF *lmf = mono_get_lmf ();
1437 MonoException *mono_ex;
1438 gboolean stack_overflow = FALSE;
1439 MonoContext initial_ctx;
1441 int frame_count = 0;
1442 gint32 filter_idx, first_filter_idx = 0;
1445 MonoObject *non_exception = NULL;
1447 g_assert (ctx != NULL);
1449 MonoException *ex = mono_get_exception_null_reference ();
1450 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1451 obj = (MonoObject *)ex;
1455 * Allocate a new exception object instead of the preconstructed ones.
1457 if (obj == domain->stack_overflow_ex) {
1459 * It is not a good idea to try and put even more pressure on the little stack available.
1460 * obj = mono_get_exception_stack_overflow ();
1462 stack_overflow = TRUE;
1464 else if (obj == domain->null_reference_ex) {
1465 obj = mono_get_exception_null_reference ();
1468 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1469 non_exception = obj;
1470 obj = mono_get_exception_runtime_wrapped (obj);
1473 mono_ex = (MonoException*)obj;
1475 if (mini_get_debug_options ()->suspend_on_exception) {
1476 mono_runtime_printf_err ("Exception thrown, suspending...");
1481 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1482 mono_ex = (MonoException*)obj;
1487 if (mono_ex && jit_tls->class_cast_from) {
1488 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1489 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1490 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1491 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1492 mono_ex->message = mono_string_new (domain, msg);
1497 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1498 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1499 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1500 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1501 mono_ex->message = mono_string_new (domain, msg);
1509 call_filter = mono_get_call_filter ();
1511 g_assert (jit_tls->end_of_stack);
1512 g_assert (jit_tls->abort_func);
1515 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1516 * end up being TRUE on any code path.
1518 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1523 MonoContext ctx_cp = *ctx;
1524 if (mono_trace_is_enabled ()) {
1525 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1526 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1527 MonoObject *message;
1528 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1530 MonoObject *exc = NULL;
1531 if (get_message == NULL) {
1533 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1535 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1537 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1541 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1543 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1545 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1546 mono_print_thread_dump_from_ctx (ctx);
1548 jit_tls->orig_ex_ctx_set = TRUE;
1549 mono_profiler_exception_thrown (obj);
1550 jit_tls->orig_ex_ctx_set = FALSE;
1552 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1555 if (mini_get_debug_options ()->break_on_exc)
1557 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1559 if (mini_get_debug_options ()->suspend_on_unhandled) {
1560 mono_runtime_printf_err ("Unhandled exception, suspending...");
1565 // FIXME: This runs managed code so it might cause another stack overflow when
1566 // we are handling a stack overflow
1567 mono_unhandled_exception (obj);
1569 gboolean unhandled = FALSE;
1572 * The exceptions caught by the mono_runtime_invoke () calls
1573 * in the threadpool needs to be treated as unhandled (#669836).
1575 * FIXME: The check below is hackish, but its hard to distinguish
1576 * these runtime invoke calls from others in the runtime.
1578 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1579 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1584 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1586 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1596 MonoContext new_ctx;
1598 int clause_index_start = 0;
1599 gboolean unwind_res = TRUE;
1603 ji = jit_tls->resume_state.ji;
1604 new_ctx = jit_tls->resume_state.new_ctx;
1605 clause_index_start = jit_tls->resume_state.clause_index;
1606 lmf = jit_tls->resume_state.lmf;
1607 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1608 filter_idx = jit_tls->resume_state.filter_idx;
1610 StackFrameInfo frame;
1612 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1614 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1615 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1616 frame.type == FRAME_TYPE_TRAMPOLINE) {
1620 g_assert (frame.type == FRAME_TYPE_MANAGED);
1626 *(mono_get_lmf_addr ()) = lmf;
1628 jit_tls->abort_func (obj);
1629 g_assert_not_reached ();
1632 method = jinfo_get_method (ji);
1634 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1636 if (stack_overflow) {
1637 if (DOES_STACK_GROWS_UP)
1638 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1640 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1642 free_stack = 0xffffff;
1645 for (i = clause_index_start; i < ji->num_clauses; i++) {
1646 MonoJitExceptionInfo *ei = &ji->clauses [i];
1647 gboolean filtered = FALSE;
1650 * During stack overflow, wait till the unwinding frees some stack
1651 * space before running handlers/finalizers.
1653 if (free_stack <= (64 * 1024))
1656 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1658 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1661 * Have to unwrap RuntimeWrappedExceptions if the
1662 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1664 if (non_exception && !wrap_non_exception_throws (method))
1665 ex_obj = non_exception;
1669 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1670 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1671 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1673 g_assert (!ji->from_llvm);
1674 /* store the exception object in bp + ei->exvar_offset */
1675 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1679 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1681 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1684 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1686 * Filter clauses should only be run in the
1687 * first pass of exception handling.
1689 filtered = (filter_idx == first_filter_idx);
1693 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1694 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1696 * This guards against the situation that we abort a thread that is executing a finally clause
1697 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1698 * check for this situation here and resume interruption if we are below the guarded block.
1700 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1701 gboolean is_outside = FALSE;
1702 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1703 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1704 //FIXME make this stack direction aware
1705 if (catch_bp > prot_bp) {
1707 } else if (catch_bp == prot_bp) {
1708 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1709 * So we check if the catch handler_start is protected by the guarded handler protected region
1712 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1713 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1714 * There aren't any further finally/fault handler blocks down the stack over this exception.
1715 * This must be ensured by the code that installs the guard trampoline.
1717 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1719 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1724 jit_tls->handler_block_return_address = NULL;
1725 jit_tls->handler_block = NULL;
1726 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1730 if (mono_trace_is_enabled () && mono_trace_eval (method))
1731 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1732 jit_tls->orig_ex_ctx_set = TRUE;
1733 mono_profiler_exception_clause_handler (method, ei->flags, i);
1734 jit_tls->orig_ex_ctx_set = FALSE;
1735 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1737 #ifndef DISABLE_PERFCOUNTERS
1738 mono_perfcounters->exceptions_depth += frame_count;
1740 if (obj == domain->stack_overflow_ex)
1741 jit_tls->handling_stack_ovf = FALSE;
1745 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1746 if (mono_trace_is_enabled () && mono_trace_eval (method))
1747 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1748 jit_tls->orig_ex_ctx_set = TRUE;
1749 mono_profiler_exception_clause_handler (method, ei->flags, i);
1750 jit_tls->orig_ex_ctx_set = FALSE;
1751 call_filter (ctx, ei->handler_start);
1753 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1754 if (mono_trace_is_enabled () && mono_trace_eval (method))
1755 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1756 jit_tls->orig_ex_ctx_set = TRUE;
1757 mono_profiler_exception_clause_handler (method, ei->flags, i);
1758 jit_tls->orig_ex_ctx_set = FALSE;
1759 #ifndef DISABLE_PERFCOUNTERS
1760 mono_perfcounters->exceptions_finallys++;
1763 if (ji->from_llvm) {
1765 * LLVM compiled finally handlers follow the design
1766 * of the c++ ehabi, i.e. they call a resume function
1767 * at the end instead of returning to the caller.
1768 * So save the exception handling state,
1769 * mono_resume_unwind () will call us again to continue
1772 jit_tls->resume_state.ex_obj = obj;
1773 jit_tls->resume_state.ji = ji;
1774 jit_tls->resume_state.clause_index = i + 1;
1775 jit_tls->resume_state.ctx = *ctx;
1776 jit_tls->resume_state.new_ctx = new_ctx;
1777 jit_tls->resume_state.lmf = lmf;
1778 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1779 jit_tls->resume_state.filter_idx = filter_idx;
1780 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1783 call_filter (ctx, ei->handler_start);
1789 jit_tls->orig_ex_ctx_set = TRUE;
1790 mono_profiler_exception_method_leave (method);
1791 jit_tls->orig_ex_ctx_set = FALSE;
1796 g_assert_not_reached ();
1800 * mono_debugger_run_finally:
1801 * @start_ctx: saved processor state
1803 * This method is called by the Mono Debugger to call all `finally' clauses of the
1804 * current stack frame. It's used when the user issues a `return' command to make
1805 * the current stack frame return. After returning from this method, the debugger
1806 * unwinds the stack one frame and gives control back to the user.
1808 * NOTE: This method is only used when running inside the Mono Debugger.
1811 mono_debugger_run_finally (MonoContext *start_ctx)
1813 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1814 MonoDomain *domain = mono_domain_get ();
1815 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1816 MonoLMF *lmf = mono_get_lmf ();
1817 MonoContext ctx, new_ctx;
1818 MonoJitInfo *ji, rji;
1823 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1824 if (!ji || ji == (gpointer)-1)
1828 call_filter = mono_get_call_filter ();
1830 for (i = 0; i < ji->num_clauses; i++) {
1831 MonoJitExceptionInfo *ei = &ji->clauses [i];
1833 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1834 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1835 call_filter (&ctx, ei->handler_start);
1841 * mono_handle_exception:
1842 * @ctx: saved processor state
1843 * @obj: the exception object
1846 mono_handle_exception (MonoContext *ctx, gpointer obj)
1848 #ifndef DISABLE_PERFCOUNTERS
1849 mono_perfcounters->exceptions_thrown++;
1852 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1855 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1857 #ifndef MONO_ARCH_USE_SIGACTION
1858 #error "Can't use sigaltstack without sigaction"
1861 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1864 mono_setup_altstack (MonoJitTlsData *tls)
1868 guint8 *staddr = NULL;
1870 if (mono_running_on_valgrind ())
1873 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1877 tls->end_of_stack = staddr + stsize;
1878 tls->stack_size = stsize;
1880 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1882 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1883 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1885 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1887 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1888 /* mprotect can fail for the main thread stack */
1889 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);
1890 g_assert (gaddr == tls->stack_ovf_guard_base);
1891 tls->stack_ovf_valloced = TRUE;
1894 /* Setup an alternate signal stack */
1895 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1896 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1898 g_assert (tls->signal_stack);
1900 sa.ss_sp = tls->signal_stack;
1901 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1903 g_assert (sigaltstack (&sa, NULL) == 0);
1905 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);
1909 mono_free_altstack (MonoJitTlsData *tls)
1914 sa.ss_sp = tls->signal_stack;
1915 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1916 sa.ss_flags = SS_DISABLE;
1917 err = sigaltstack (&sa, NULL);
1918 g_assert (err == 0);
1920 if (tls->signal_stack)
1921 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1922 if (tls->stack_ovf_valloced)
1923 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1925 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1928 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1931 mono_setup_altstack (MonoJitTlsData *tls)
1936 mono_free_altstack (MonoJitTlsData *tls)
1940 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1943 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1945 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1946 /* we need to leave some room for throwing the exception */
1947 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1948 unprotect_size -= mono_pagesize ();
1949 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1950 * is sufficient stack
1952 //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);
1954 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1955 return unprotect_size == jit_tls->stack_ovf_guard_size;
1958 static G_GNUC_UNUSED void
1959 try_more_restore (void)
1961 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1962 if (try_restore_stack_protection (jit_tls, 500))
1963 jit_tls->restore_stack_prot = NULL;
1966 static G_GNUC_UNUSED void
1967 restore_stack_protection (void)
1969 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1970 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1971 /* if we can't restore the stack protection, keep a callback installed so
1972 * we'll try to restore as much stack as we can at each return from unmanaged
1975 if (try_restore_stack_protection (jit_tls, 4096))
1976 jit_tls->restore_stack_prot = NULL;
1978 jit_tls->restore_stack_prot = try_more_restore_tramp;
1979 /* here we also throw a stack overflow exception */
1980 ex->trace_ips = NULL;
1981 ex->stack_trace = NULL;
1982 mono_raise_exception (ex);
1986 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1988 void (*func)(void) = (gpointer)tramp_data;
1994 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1996 /* we got a stack overflow in the soft-guard pages
1997 * There are two cases:
1998 * 1) managed code caused the overflow: we unprotect the soft-guard page
1999 * and let the arch-specific code trigger the exception handling mechanism
2000 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2001 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2002 * and hope we can continue with those enabled, at least until the hard-guard page
2003 * is hit. The alternative to continuing here is to just print a message and abort.
2004 * We may add in the future the code to protect the pages again in the codepath
2005 * when we return from unmanaged to managed code.
2007 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2008 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2009 /* we unprotect the minimum amount we can */
2011 gboolean handled = FALSE;
2013 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2014 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2015 guard_size -= mono_pagesize ();
2017 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2018 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2019 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);
2020 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2022 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2027 /* We print a message: after this even managed stack overflows
2028 * may crash the runtime
2030 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2031 if (!jit_tls->handling_stack_ovf) {
2032 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2033 jit_tls->handling_stack_ovf = 1;
2035 /*fprintf (stderr, "Already handling stack overflow\n");*/
2044 MonoMethod *omethod;
2046 } PrintOverflowUserData;
2048 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2050 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2052 MonoMethod *method = NULL;
2053 PrintOverflowUserData *user_data = data;
2056 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2057 method = jinfo_get_method (frame->ji);
2060 if (user_data->count == 0) {
2061 /* The first frame is in its prolog, so a line number cannot be computed */
2062 user_data->count ++;
2066 /* If this is a one method overflow, skip the other instances */
2067 if (method == user_data->omethod)
2070 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2071 mono_runtime_printf_err (" %s", location);
2074 if (user_data->count == 1) {
2075 mono_runtime_printf_err (" <...>");
2076 user_data->omethod = method;
2078 user_data->omethod = NULL;
2081 user_data->count ++;
2083 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2090 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2092 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2093 PrintOverflowUserData ud;
2097 /* we don't do much now, but we can warn the user with a useful message */
2098 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2100 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2101 mono_sigctx_to_monoctx (ctx, &mctx);
2103 mono_runtime_printf_err ("Stacktrace:");
2105 memset (&ud, 0, sizeof (ud));
2107 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2109 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2110 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2112 mono_runtime_printf_err ("At <unmanaged>.");
2119 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2121 MonoMethod *method = NULL;
2123 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2124 method = jinfo_get_method (frame->ji);
2127 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2128 mono_runtime_printf_err (" %s", location);
2131 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2136 static G_GNUC_UNUSED gboolean
2137 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2139 GString *p = (GString*)data;
2140 MonoMethod *method = NULL;
2142 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2143 method = jinfo_get_method (frame->ji);
2145 if (method && frame->domain) {
2146 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2147 g_string_append_printf (p, " %s\n", location);
2150 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2155 #ifndef MONO_CROSS_COMPILE
2157 static gboolean handling_sigsegv = FALSE;
2160 * mono_handle_native_sigsegv:
2162 * Handle a SIGSEGV received while in native code by printing diagnostic
2163 * information and aborting.
2166 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2168 #ifdef MONO_ARCH_USE_SIGACTION
2169 struct sigaction sa;
2171 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2172 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2174 if (handling_sigsegv)
2177 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2178 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2189 /* To prevent infinite loops when the stack walk causes a crash */
2190 handling_sigsegv = TRUE;
2192 /* !jit_tls means the thread was not registered with the runtime */
2193 if (jit_tls && mono_thread_internal_current ()) {
2194 mono_runtime_printf_err ("Stacktrace:\n");
2196 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2199 #ifdef HAVE_BACKTRACE_SYMBOLS
2205 mono_runtime_printf_err ("\nNative stacktrace:\n");
2207 size = backtrace (array, 256);
2208 names = backtrace_symbols (array, size);
2209 for (i =0; i < size; ++i) {
2210 mono_runtime_printf_err ("\t%s", names [i]);
2214 /* Try to get more meaningful information using gdb */
2216 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2217 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2218 /* From g_spawn_command_line_sync () in eglib */
2221 pid_t crashed_pid = getpid ();
2225 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2226 * it will deadlock. Call the syscall directly instead.
2228 pid = mono_runtime_syscall_fork ();
2229 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2231 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2232 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2233 // distributions set the scope to 1 which allows attaching only to direct children of
2234 // the current process
2235 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2239 dup2 (STDERR_FILENO, STDOUT_FILENO);
2241 mono_gdb_render_native_backtraces (crashed_pid);
2245 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2246 waitpid (pid, &status, 0);
2250 #elif defined (ENABLE_EXTENSION_MODULE)
2251 mono_extension_handle_native_sigsegv (ctx, info);
2255 * A SIGSEGV indicates something went very wrong so we can no longer depend
2256 * on anything working. So try to print out lots of diagnostics, starting
2257 * with ones which have a greater chance of working.
2259 mono_runtime_printf_err (
2261 "=================================================================\n"
2262 "Got a %s while executing native code. This usually indicates\n"
2263 "a fatal error in the mono runtime or one of the native libraries \n"
2264 "used by your application.\n"
2265 "=================================================================\n",
2269 #ifdef MONO_ARCH_USE_SIGACTION
2271 /* Remove our SIGABRT handler */
2272 sa.sa_handler = SIG_DFL;
2273 sigemptyset (&sa.sa_mask);
2276 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2280 if (!mono_do_crash_chaining) {
2281 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2282 #if defined (PLATFORM_ANDROID)
2293 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2295 g_assert_not_reached ();
2298 #endif /* !MONO_CROSS_COMPILE */
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
2312 GError *error = NULL;
2317 text = g_string_new (0);
2319 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2321 g_string_append_printf (text, "\n\"%s\"", name);
2324 else if (thread->threadpool_thread)
2325 g_string_append (text, "\n\"<threadpool thread>\"");
2327 g_string_append (text, "\n\"<unnamed thread>\"");
2330 wapi_desc = wapi_current_thread_desc ();
2331 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2335 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2337 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2339 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2341 mono_sigctx_to_monoctx (sigctx, &ctx);
2343 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2345 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2348 mono_runtime_printf ("%s", text->str);
2350 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2351 OutputDebugStringA(text->str);
2354 g_string_free (text, TRUE);
2355 mono_runtime_stdout_fflush ();
2359 * mono_print_thread_dump:
2361 * Print information about the current thread to stdout.
2362 * SIGCTX can be NULL, allowing this to be called from gdb.
2365 mono_print_thread_dump (void *sigctx)
2367 mono_print_thread_dump_internal (sigctx, NULL);
2371 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2373 mono_print_thread_dump_internal (NULL, ctx);
2377 * mono_resume_unwind:
2379 * This is called by a trampoline from LLVM compiled finally clauses to continue
2383 mono_resume_unwind (MonoContext *ctx)
2385 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2386 MonoContext new_ctx;
2388 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2389 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2392 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2394 mono_restore_context (&new_ctx);
2397 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2402 MonoJitExceptionInfo *ei;
2403 } FindHandlerBlockData;
2406 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2410 FindHandlerBlockData *pdata = data;
2411 MonoJitInfo *ji = frame->ji;
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 /* Do an async safe stack walk */
2485 mono_thread_info_set_is_async_context (TRUE);
2486 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2487 mono_thread_info_set_is_async_context (FALSE);
2492 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2494 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2495 if (resume_ip == NULL)
2498 jit_tls->handler_block_return_address = resume_ip;
2499 jit_tls->handler_block = data.ei;
2506 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2514 mono_set_cast_details (MonoClass *from, MonoClass *to)
2516 MonoJitTlsData *jit_tls = NULL;
2518 if (mini_get_debug_options ()->better_cast_details) {
2519 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2520 jit_tls->class_cast_from = from;
2521 jit_tls->class_cast_to = to;
2526 /*returns false if the thread is not attached*/
2528 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2530 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2531 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2539 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2541 #if defined(MONO_CROSS_COMPILE)
2542 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2543 #elif MONO_ARCH_HAS_MONO_CONTEXT
2544 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2546 g_error ("Use a null sigctx requires a working mono-context");
2549 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2550 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2551 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2553 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2559 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2565 mono_thread_state_init (MonoThreadUnwindState *ctx)
2567 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2569 #if defined(MONO_CROSS_COMPILE)
2570 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2571 #elif MONO_ARCH_HAS_MONO_CONTEXT
2572 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2574 g_error ("Use a null sigctx requires a working mono-context");
2577 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2578 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2579 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2585 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2587 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2594 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2595 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2596 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2601 /*returns false if the thread is not attached*/
2603 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2605 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2606 MONO_ARCH_CONTEXT_DEF
2608 mono_arch_flush_register_windows ();
2610 if (!thread || !thread->jit_data) {
2614 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2615 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2617 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2620 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2621 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2622 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2628 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2630 mono_handle_exception (ctx, exc);
2631 mono_restore_context (ctx);
2634 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2636 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2638 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2639 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2640 jit_tls->ex_ctx = *ctx;
2642 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2644 g_error ("This target doesn't support mono_arch_setup_async_callback");
2649 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2651 unhandled_exception_hook = func;
2652 unhandled_exception_hook_data = user_data;
2656 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2658 if (unhandled_exception_hook) {
2659 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2661 MonoObject *other = NULL;
2662 MonoString *str = mono_object_to_string (exc, &other);
2666 msg = mono_string_to_utf8 (str);
2668 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2669 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2671 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2672 original_backtrace, nested_backtrace);
2674 g_free (original_backtrace);
2675 g_free (nested_backtrace);
2677 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2679 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2681 #if defined(HOST_IOS)
2682 g_assertion_message ("Terminating runtime due to unhandled exception");
2684 exit (mono_environment_exitcode_get ());
2688 g_assert_not_reached ();
2692 * mono_restore_context:
2694 * Call the architecture specific restore context function.
2697 mono_restore_context (MonoContext *ctx)
2699 static void (*restore_context) (MonoContext *);
2701 if (!restore_context)
2702 restore_context = mono_get_restore_context ();
2703 restore_context (ctx);
2704 g_assert_not_reached ();
2708 * mono_jinfo_get_unwind_info:
2710 * Return the unwind info for JI.
2713 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2716 return mono_aot_get_unwind_info (ji, unwind_info_len);
2718 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2722 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2724 MonoArchEHJitInfo *info;
2726 info = mono_jit_info_get_arch_eh_info (ji);
2729 return info->epilog_size;