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>
49 #include <mono/metadata/appdomain.h>
50 #include <mono/metadata/tabledefs.h>
51 #include <mono/metadata/threads.h>
52 #include <mono/metadata/threads-types.h>
53 #include <mono/metadata/debug-helpers.h>
54 #include <mono/metadata/exception.h>
55 #include <mono/metadata/object-internals.h>
56 #include <mono/metadata/gc-internals.h>
57 #include <mono/metadata/mono-debug.h>
58 #include <mono/metadata/profiler.h>
59 #include <mono/metadata/mono-endian.h>
60 #include <mono/metadata/environment.h>
61 #include <mono/metadata/mono-mlist.h>
62 #include <mono/utils/mono-mmap.h>
63 #include <mono/utils/mono-logger-internals.h>
67 #include "debugger-agent.h"
68 #include "seq-points.h"
69 #include "llvm-runtime.h"
70 #include "mini-llvm.h"
73 #include "mini-llvm-cpp.h"
76 #ifdef ENABLE_EXTENSION_MODULE
77 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
80 #ifndef MONO_ARCH_CONTEXT_DEF
81 #define MONO_ARCH_CONTEXT_DEF
84 static gpointer restore_context_func, call_filter_func;
85 static gpointer throw_exception_func, rethrow_exception_func;
86 static gpointer throw_corlib_exception_func;
88 static gpointer try_more_restore_tramp = NULL;
89 static gpointer restore_stack_protection_tramp = NULL;
91 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
92 static gpointer unhandled_exception_hook_data = NULL;
94 static void try_more_restore (void);
95 static void restore_stack_protection (void);
96 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
97 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
98 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
101 mono_exceptions_init (void)
103 MonoRuntimeExceptionHandlingCallbacks cbs;
105 restore_context_func = mono_aot_get_trampoline ("restore_context");
106 call_filter_func = mono_aot_get_trampoline ("call_filter");
107 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
108 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
112 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
113 mono_tramp_info_register (info, NULL);
114 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
115 mono_tramp_info_register (info, NULL);
116 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
117 mono_tramp_info_register (info, NULL);
118 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
119 mono_tramp_info_register (info, NULL);
121 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
122 if (!mono_llvm_only) {
123 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
124 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
128 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
129 mono_arch_exceptions_init ();
131 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
132 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
135 cbs.mono_raise_exception = mono_llvm_raise_exception;
137 cbs.mono_raise_exception = mono_get_throw_exception ();
138 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
139 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
140 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
141 mono_install_eh_callbacks (&cbs);
145 mono_get_throw_exception (void)
147 g_assert (throw_exception_func);
148 return throw_exception_func;
152 mono_get_rethrow_exception (void)
154 g_assert (rethrow_exception_func);
155 return rethrow_exception_func;
159 mono_get_call_filter (void)
161 g_assert (call_filter_func);
162 return call_filter_func;
166 mono_get_restore_context (void)
168 g_assert (restore_context_func);
169 return restore_context_func;
173 mono_get_throw_corlib_exception (void)
175 gpointer code = NULL;
178 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
179 if (throw_corlib_exception_func)
180 return throw_corlib_exception_func;
183 code = mono_aot_get_trampoline ("throw_corlib_exception");
185 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
186 mono_tramp_info_register (info, NULL);
189 mono_memory_barrier ();
191 throw_corlib_exception_func = code;
193 return throw_corlib_exception_func;
197 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
199 MonoTryBlockHoleTableJitInfo *table;
204 if (ei->try_start > ip || ip >= ei->try_end)
207 if (!ji->has_try_block_holes)
210 table = mono_jit_info_get_try_block_hole_table_info (ji);
211 offset = (guint32)((char*)ip - (char*)ji->code_start);
212 clause = (guint16)(ei - ji->clauses);
213 g_assert (clause < ji->num_clauses);
215 for (i = 0; i < table->num_holes; ++i) {
216 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
217 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
226 * Translate between the mono_arch_unwind_frame function and the old API.
229 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
230 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
232 StackFrameInfo frame;
235 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
237 /* Avoid costly table lookup during stack overflow */
238 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
241 ji = mini_jit_info_table_find (domain, ip, NULL);
246 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
250 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
252 * Remove any unused lmf.
253 * Mask out the lower bits which might be used to hold additional information.
255 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
258 /* Convert between the new and the old APIs */
259 switch (frame.type) {
260 case FRAME_TYPE_MANAGED:
264 case FRAME_TYPE_TRAMPOLINE:
266 case FRAME_TYPE_MANAGED_TO_NATIVE:
270 memset (res, 0, sizeof (MonoJitInfo));
271 res->d.method = frame.method;
274 case FRAME_TYPE_DEBUGGER_INVOKE: {
278 * The normal exception handling code can't handle this frame, so just
281 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
282 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
286 g_assert_not_reached ();
291 /* mono_find_jit_info:
293 * This function is used to gather information from @ctx. It return the
294 * MonoJitInfo of the corresponding function, unwinds one stack frame and
295 * stores the resulting context into @new_ctx. It also stores a string
296 * describing the stack location into @trace (if not NULL), and modifies
297 * the @lmf if necessary. @native_offset return the IP offset from the
298 * start of the function or -1 if that info is not available.
301 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
302 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
306 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
308 MonoMethod *method = NULL;
319 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
321 if (ji == (gpointer)-1)
324 if (ji && !ji->is_trampoline)
325 method = jinfo_get_method (ji);
327 if (managed2 || (method && method->wrapper_type)) {
328 const char *real_ip, *start;
331 start = (const char *)ji->code_start;
333 /* ctx->ip points into native code */
334 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
336 real_ip = (const char*)ip;
338 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
339 offset = real_ip - start;
344 *native_offset = offset;
347 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
351 *trace = mono_debug_print_stack_frame (method, offset, domain);
354 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
355 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
364 * mono_find_jit_info_ext:
366 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
368 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
369 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
370 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
371 * to obtain the last managed frame.
372 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
373 * On return, it will be filled with the locations where callee saved registers are saved
374 * by the current frame. This is returned outside of StackFrameInfo because it can be
375 * quite large on some platforms.
376 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
380 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
381 MonoJitInfo *prev_ji, MonoContext *ctx,
382 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
383 mgreg_t **save_locations,
384 StackFrameInfo *frame)
387 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
389 MonoDomain *target_domain = domain;
390 MonoMethod *method = NULL;
391 gboolean async = mono_thread_info_is_async_context ();
396 /* Avoid costly table lookup during stack overflow */
397 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
400 ji = mini_jit_info_table_find (domain, ip, &target_domain);
403 target_domain = domain;
406 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
408 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
412 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
414 * Remove any unused lmf.
415 * Mask out the lower bits which might be used to hold additional information.
417 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
420 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
421 method = jinfo_get_method (frame->ji);
423 if (frame->type == FRAME_TYPE_MANAGED && method) {
424 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
425 frame->managed = TRUE;
428 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
430 * This type of frame is just a marker, the caller should unwind once more to get the
431 * last managed frame.
434 frame->method = NULL;
437 frame->native_offset = -1;
438 frame->domain = target_domain;
439 frame->async_context = async;
443 if (frame->type == FRAME_TYPE_MANAGED)
444 frame->method = method;
446 if (ji && (frame->managed || (method && method->wrapper_type))) {
447 const char *real_ip, *start;
449 start = (const char *)ji->code_start;
451 /* ctx->ip points into native code */
452 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
454 real_ip = (const char*)ip;
456 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
457 frame->native_offset = real_ip - start;
459 frame->native_offset = -1;
462 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
464 if (trace && frame->method) {
465 char *fname = mono_method_full_name (frame->method, TRUE);
466 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
475 * This function is async-safe.
478 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
480 MonoGenericJitInfo *gi;
484 if (!ji->has_generic_jit_info)
486 gi = mono_jit_info_get_generic_jit_info (ji);
492 * Search location list if available, it contains the precise location of the
493 * argument for every pc offset, even if the method was interrupted while it was in
497 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
500 for (i = 0; i < gi->nlocs; ++i) {
501 MonoDwarfLocListEntry *entry = &gi->locations [i];
503 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
505 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
507 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
511 g_assert (i < gi->nlocs);
514 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
516 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
520 method = jinfo_get_method (ji);
521 if (mono_method_get_context (method)->method_inst) {
523 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
526 /* Avoid returning a managed object */
527 MonoObject *this_obj = info;
529 return this_obj->vtable->klass;
533 static MonoGenericContext
534 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
536 MonoGenericContext context = { NULL, NULL };
537 MonoClass *klass, *method_container_class;
540 g_assert (generic_info);
542 method = jinfo_get_method (ji);
543 g_assert (method->is_inflated);
544 if (mono_method_get_context (method)->method_inst) {
545 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
547 klass = mrgctx->class_vtable->klass;
548 context.method_inst = mrgctx->method_inst;
549 g_assert (context.method_inst);
550 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
551 MonoVTable *vtable = generic_info;
553 klass = vtable->klass;
555 klass = generic_info;
558 //g_assert (!method->klass->generic_container);
559 if (method->klass->generic_class)
560 method_container_class = method->klass->generic_class->container_class;
562 method_container_class = method->klass;
564 /* class might refer to a subclass of method's class */
565 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
566 klass = klass->parent;
570 if (klass->generic_class || klass->generic_container)
571 context.class_inst = mini_class_get_context (klass)->class_inst;
573 if (klass->generic_class)
574 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
576 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
582 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
585 MonoGenericContext context;
588 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
589 return jinfo_get_method (ji);
590 context = get_generic_context_from_stack_frame (ji, generic_info);
592 method = jinfo_get_method (ji);
593 method = mono_method_get_declaring_generic_method (method);
594 method = mono_class_inflate_generic_method_checked (method, &context, &error);
595 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
601 * mono_exception_walk_native_trace:
602 * @ex: The exception object whose frames should be walked
603 * @func: callback to call for each stack frame
604 * @user_data: data passed to the callback
606 * This function walks the stacktrace of an exception. For
607 * each frame the callback function is called with the relevant info.
608 * The walk ends when no more stack frames are found or when the callback
609 * returns a TRUE value.
613 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
615 MonoDomain *domain = mono_domain_get ();
616 MonoArray *ta = ex->trace_ips;
622 len = mono_array_length (ta) >> 1;
623 for (i = 0; i < len; i++) {
624 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
625 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
626 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
629 if (func (NULL, ip, 0, FALSE, user_data))
632 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
633 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
642 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
644 MonoDomain *domain = mono_domain_get ();
646 MonoArray *ta = exc->trace_ips;
647 MonoDebugSourceLocation *location;
651 /* Exception is not thrown yet */
652 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
655 len = mono_array_length (ta) >> 1;
657 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
659 for (i = skip; i < len; i++) {
661 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
662 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
663 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
666 ji = mono_jit_info_table_find (domain, ip);
668 /* Unmanaged frame */
669 mono_array_setref (res, i, sf);
673 g_assert (ji != NULL);
675 method = get_method_from_stack_frame (ji, generic_info);
676 if (jinfo_get_method (ji)->wrapper_type) {
680 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
681 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
685 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
687 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
688 sf->method_address = (gsize) ji->code_start;
689 sf->native_offset = (char *)ip - (char *)ji->code_start;
692 * mono_debug_lookup_source_location() returns both the file / line number information
693 * and the IL offset. Note that computing the IL offset is already an expensive
694 * operation, so we shouldn't call this method twice.
696 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
698 sf->il_offset = location->il_offset;
701 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
702 sf->il_offset = sp.il_offset;
707 if (need_file_info) {
708 if (location && location->source_file) {
709 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
710 sf->line = location->row;
711 sf->column = location->column;
713 sf->line = sf->column = 0;
718 mono_debug_free_source_location (location);
719 mono_array_setref (res, i, sf);
726 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
729 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
730 if (jit_tls && jit_tls->orig_ex_ctx_set)
731 start_ctx = &jit_tls->orig_ex_ctx;
733 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
736 * mono_walk_stack_with_ctx:
738 * Unwind the current thread starting at @start_ctx.
740 * If @start_ctx is null, we capture the current context.
743 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
745 MonoContext extra_ctx;
746 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
747 MONO_ARCH_CONTEXT_DEF
749 if (!thread || !thread->jit_data)
753 mono_arch_flush_register_windows ();
755 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
756 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
758 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
760 start_ctx = &extra_ctx;
763 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
767 * mono_walk_stack_with_state:
769 * Unwind a thread described by @state.
771 * State must be valid (state->valid == TRUE).
773 * If you are using this function to unwind another thread, make sure it is suspended.
775 * If @state is null, we capture the current context.
778 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
780 MonoThreadUnwindState extra_state;
782 g_assert (!mono_thread_info_is_async_context ());
783 if (!mono_thread_state_init_from_current (&extra_state))
785 state = &extra_state;
788 g_assert (state->valid);
790 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
794 mono_walk_stack_full (func,
796 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
797 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
798 state->unwind_data [MONO_UNWIND_DATA_LMF],
799 unwind_options, user_data);
803 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
805 MonoThreadUnwindState state;
806 if (!mono_thread_state_init_from_current (&state))
808 mono_walk_stack_with_state (func, &state, options, user_data);
812 * mono_walk_stack_full:
813 * @func: callback to call for each stack frame
814 * @domain: starting appdomain, can be NULL to use the current domain
815 * @unwind_options: what extra information the unwinder should gather
816 * @start_ctx: starting state of the stack walk, can be NULL.
817 * @thread: the thread whose stack to walk, can be NULL to use the current thread
818 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
819 * @user_data: data passed to the callback
821 * This function walks the stack of a thread, starting from the state
822 * represented by start_ctx. For each frame the callback
823 * function is called with the relevant info. The walk ends when no more
824 * managed stack frames are found or when the callback returns a TRUE value.
827 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
830 MonoContext ctx, new_ctx;
831 StackFrameInfo frame;
833 mgreg_t *reg_locations [MONO_MAX_IREGS];
834 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
835 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
836 gboolean async = mono_thread_info_is_async_context ();
838 g_assert (start_ctx);
841 /*The LMF will be null if the target have no managed frames.*/
842 /* g_assert (lmf); */
845 g_assert (unwind_options == MONO_UNWIND_NONE);
847 memcpy (&ctx, start_ctx, sizeof (MonoContext));
848 memset (reg_locations, 0, sizeof (reg_locations));
850 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
852 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
856 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
857 MonoDebugSourceLocation *source;
859 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
861 il_offset = source->il_offset;
864 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
865 il_offset = sp.il_offset;
869 mono_debug_free_source_location (source);
873 frame.il_offset = il_offset;
875 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
876 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
878 frame.actual_method = frame.method;
881 if (get_reg_locations)
882 frame.reg_locations = reg_locations;
884 if (func (&frame, &ctx, user_data))
887 if (get_reg_locations) {
888 for (i = 0; i < MONO_MAX_IREGS; ++i)
889 if (new_reg_locations [i])
890 reg_locations [i] = new_reg_locations [i];
898 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
899 MonoReflectionMethod **method,
900 gint32 *iloffset, gint32 *native_offset,
901 MonoString **file, gint32 *line, gint32 *column)
903 MonoDomain *domain = mono_domain_get ();
904 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
905 MonoLMF *lmf = mono_get_lmf ();
906 MonoJitInfo *ji = NULL;
907 MonoContext ctx, new_ctx;
908 MonoDebugSourceLocation *location;
909 MonoMethod *jmethod = NULL, *actual_method;
910 StackFrameInfo frame;
913 MONO_ARCH_CONTEXT_DEF;
915 mono_arch_flush_register_windows ();
917 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
918 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
920 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
926 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
930 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
931 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
932 frame.type == FRAME_TYPE_TRAMPOLINE)
936 *native_offset = frame.native_offset;
938 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
939 jmethod = jinfo_get_method (ji);
940 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
945 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
947 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
949 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
951 *iloffset = location->il_offset;
955 if (need_file_info) {
957 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
958 *line = location->row;
959 *column = location->column;
966 mono_debug_free_source_location (location);
972 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
974 MonoClass *catch_class = ei->data.catch_class;
975 MonoType *inflated_type;
976 MonoGenericContext context;
978 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
979 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
982 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
984 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
986 /* FIXME: we shouldn't inflate but instead put the
987 type in the rgctx and fetch it from there. It
988 might be a good idea to do this lazily, i.e. only
989 when the exception is actually thrown, so as not to
990 waste space for exception clauses which might never
992 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
993 catch_class = mono_class_from_mono_type (inflated_type);
994 mono_metadata_free_type (inflated_type);
1000 * mini_jit_info_table_find_ext:
1002 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1003 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1004 * OUT_DOMAIN if it is not NULL.
1007 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1010 MonoInternalThread *t = mono_thread_internal_current ();
1016 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1019 *out_domain = domain;
1023 /* maybe it is shared code, so we also search in the root domain */
1024 if (domain != mono_get_root_domain ()) {
1025 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1028 *out_domain = mono_get_root_domain ();
1036 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1037 for (; refs && *refs; refs++) {
1038 if (*refs != domain && *refs != mono_get_root_domain ()) {
1039 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1042 *out_domain = (MonoDomain*) *refs;
1052 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1054 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1058 * wrap_non_exception_throws:
1060 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1061 * WrapNonExceptionThrows flag set.
1064 wrap_non_exception_throws (MonoMethod *m)
1066 MonoAssembly *ass = m->klass->image->assembly;
1067 MonoCustomAttrInfo* attrs;
1068 static MonoClass *klass;
1070 gboolean val = FALSE;
1073 if (ass->wrap_non_exception_throws_inited)
1074 return ass->wrap_non_exception_throws;
1076 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1078 attrs = mono_custom_attrs_from_assembly (ass);
1080 for (i = 0; i < attrs->num_attrs; ++i) {
1081 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1083 int num_named, named_type, name_len;
1086 if (!attr->ctor || attr->ctor->klass != klass)
1088 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1089 p = (const char*)attr->data;
1090 g_assert (read16 (p) == 0x0001);
1092 num_named = read16 (p);
1098 /* data_type = *p; */
1101 if (named_type != 0x54)
1103 name_len = mono_metadata_decode_blob_size (p, &p);
1104 name = g_malloc (name_len + 1);
1105 memcpy (name, p, name_len);
1106 name [name_len] = 0;
1108 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1110 /* The value is a BOOLEAN */
1113 mono_custom_attrs_free (attrs);
1116 ass->wrap_non_exception_throws = val;
1117 mono_memory_barrier ();
1118 ass->wrap_non_exception_throws_inited = TRUE;
1123 #ifndef MONO_ARCH_STACK_GROWS_UP
1124 #define DOES_STACK_GROWS_UP 1
1126 #define DOES_STACK_GROWS_UP 0
1129 #define MAX_UNMANAGED_BACKTRACE 128
1131 build_native_trace (void)
1133 /* This puppy only makes sense on mobile, IOW, ARM. */
1134 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1136 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1137 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1142 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1144 for (i = 0; i < size; i++)
1145 mono_array_set (res, gpointer, i, native_trace [i]);
1153 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1155 if (mono_ex && !initial_trace_ips) {
1156 *trace_ips = g_list_reverse (*trace_ips);
1157 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (*trace_ips, mono_defaults.int_class));
1158 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1159 if (dynamic_methods) {
1160 /* These methods could go away anytime, so save a reference to them in the exception object */
1162 MonoMList *list = NULL;
1164 for (l = dynamic_methods; l; l = l->next) {
1166 MonoDomain *domain = mono_domain_get ();
1168 if (domain->method_to_dyn_method) {
1169 mono_domain_lock (domain);
1170 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1171 mono_domain_unlock (domain);
1173 MonoObject *o = mono_gchandle_get_target (dis_link);
1175 list = mono_mlist_prepend (list, o);
1181 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1184 g_list_free (*trace_ips);
1189 * mono_handle_exception_internal_first_pass:
1191 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1192 * OBJ is found. Run the index of the filter clause which caught the exception into
1193 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1196 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1198 MonoDomain *domain = mono_domain_get ();
1199 MonoJitInfo *ji = NULL;
1200 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1201 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1202 MonoLMF *lmf = mono_get_lmf ();
1203 MonoArray *initial_trace_ips = NULL;
1204 GList *trace_ips = NULL;
1205 GSList *dynamic_methods = NULL;
1206 MonoException *mono_ex;
1207 gboolean stack_overflow = FALSE;
1208 MonoContext initial_ctx;
1210 int frame_count = 0;
1215 g_assert (ctx != NULL);
1217 if (obj == domain->stack_overflow_ex)
1218 stack_overflow = TRUE;
1220 mono_ex = (MonoException*)obj;
1221 initial_trace_ips = mono_ex->trace_ips;
1223 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1224 mono_ex = (MonoException*)obj;
1225 initial_trace_ips = mono_ex->trace_ips;
1231 call_filter = mono_get_call_filter ();
1233 g_assert (jit_tls->end_of_stack);
1234 g_assert (jit_tls->abort_func);
1237 *out_filter_idx = -1;
1241 *out_prev_ji = NULL;
1246 MonoContext new_ctx;
1248 int clause_index_start = 0;
1249 gboolean unwind_res = TRUE;
1251 StackFrameInfo frame;
1256 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1258 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1259 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1260 frame.type == FRAME_TYPE_TRAMPOLINE) {
1264 g_assert (frame.type == FRAME_TYPE_MANAGED);
1269 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1270 g_slist_free (dynamic_methods);
1275 method = jinfo_get_method (ji);
1276 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1278 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1279 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1280 "The native frame called the managed method:\n%s\n",
1281 mono_method_full_name (method, TRUE));
1284 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1286 * Avoid overwriting the stack trace if the exception is
1287 * rethrown. Also avoid giant stack traces during a stack
1290 if (!initial_trace_ips && (frame_count < 1000)) {
1291 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1292 trace_ips = g_list_prepend (trace_ips,
1293 get_generic_info_from_stack_frame (ji, ctx));
1297 if (method->dynamic)
1298 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1300 if (stack_overflow) {
1301 if (DOES_STACK_GROWS_UP)
1302 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1304 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1306 free_stack = 0xffffff;
1309 for (i = clause_index_start; i < ji->num_clauses; i++) {
1310 MonoJitExceptionInfo *ei = &ji->clauses [i];
1311 gboolean filtered = FALSE;
1314 * During stack overflow, wait till the unwinding frees some stack
1315 * space before running handlers/finalizers.
1317 if (free_stack <= (64 * 1024))
1320 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1322 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1325 * Have to unwrap RuntimeWrappedExceptions if the
1326 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1328 if (non_exception && !wrap_non_exception_throws (method))
1329 ex_obj = non_exception;
1333 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1334 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1335 #ifndef DISABLE_PERFCOUNTERS
1336 mono_perfcounters->exceptions_filters++;
1339 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1340 trim the stackframe since if it returns FALSE we lose information.
1342 FIXME Not 100% sure if it's a good idea even with user clauses.
1345 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1347 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1349 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1351 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1352 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1354 g_assert (!ji->from_llvm);
1355 /* store the exception object in bp + ei->exvar_offset */
1356 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1359 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1361 * Pass the original il clause index to the landing pad so it can
1362 * branch to the landing pad associated with the il clause.
1363 * This is needed because llvm compiled code assumes that the EH
1364 * code always branches to the innermost landing pad.
1367 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1370 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1371 filtered = call_filter (ctx, ei->data.filter);
1372 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1373 if (filtered && out_filter_idx)
1374 *out_filter_idx = filter_idx;
1381 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1382 g_slist_free (dynamic_methods);
1383 /* mono_debugger_agent_handle_exception () needs this */
1384 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1389 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1390 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1391 g_slist_free (dynamic_methods);
1396 /* mono_debugger_agent_handle_exception () needs this */
1397 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1406 g_assert_not_reached ();
1410 * mono_handle_exception_internal:
1411 * @ctx: saved processor state
1412 * @obj: the exception object
1413 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1416 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1418 MonoDomain *domain = mono_domain_get ();
1419 MonoJitInfo *ji, *prev_ji;
1420 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1421 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1422 MonoLMF *lmf = mono_get_lmf ();
1423 MonoException *mono_ex;
1424 gboolean stack_overflow = FALSE;
1425 MonoContext initial_ctx;
1427 int frame_count = 0;
1428 gint32 filter_idx, first_filter_idx = 0;
1431 MonoObject *non_exception = NULL;
1433 g_assert (ctx != NULL);
1435 MonoException *ex = mono_get_exception_null_reference ();
1436 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1437 obj = (MonoObject *)ex;
1441 * Allocate a new exception object instead of the preconstructed ones.
1443 if (obj == domain->stack_overflow_ex) {
1445 * It is not a good idea to try and put even more pressure on the little stack available.
1446 * obj = mono_get_exception_stack_overflow ();
1448 stack_overflow = TRUE;
1450 else if (obj == domain->null_reference_ex) {
1451 obj = mono_get_exception_null_reference ();
1454 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1455 non_exception = obj;
1456 obj = mono_get_exception_runtime_wrapped (obj);
1459 mono_ex = (MonoException*)obj;
1461 if (mini_get_debug_options ()->suspend_on_exception) {
1462 mono_runtime_printf_err ("Exception thrown, suspending...");
1467 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1468 mono_ex = (MonoException*)obj;
1473 if (mono_ex && jit_tls->class_cast_from) {
1474 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1475 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1476 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1477 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1478 mono_ex->message = mono_string_new (domain, msg);
1483 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1484 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1485 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1486 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1487 mono_ex->message = mono_string_new (domain, msg);
1495 call_filter = mono_get_call_filter ();
1497 g_assert (jit_tls->end_of_stack);
1498 g_assert (jit_tls->abort_func);
1501 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1502 * end up being TRUE on any code path.
1504 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1509 MonoContext ctx_cp = *ctx;
1510 if (mono_trace_is_enabled ()) {
1511 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1512 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1513 MonoObject *message;
1514 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1516 MonoObject *exc = NULL;
1517 if (get_message == NULL) {
1519 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1521 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1523 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1527 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1529 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)mono_native_thread_id_get (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1531 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1532 mono_print_thread_dump_from_ctx (ctx);
1534 jit_tls->orig_ex_ctx_set = TRUE;
1535 mono_profiler_exception_thrown (obj);
1536 jit_tls->orig_ex_ctx_set = FALSE;
1538 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1541 if (mini_get_debug_options ()->break_on_exc)
1543 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1545 if (mini_get_debug_options ()->suspend_on_unhandled) {
1546 mono_runtime_printf_err ("Unhandled exception, suspending...");
1551 // FIXME: This runs managed code so it might cause another stack overflow when
1552 // we are handling a stack overflow
1553 mono_unhandled_exception (obj);
1555 gboolean unhandled = FALSE;
1558 * The exceptions caught by the mono_runtime_invoke () calls
1559 * in the threadpool needs to be treated as unhandled (#669836).
1561 * FIXME: The check below is hackish, but its hard to distinguish
1562 * these runtime invoke calls from others in the runtime.
1564 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1565 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1570 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1572 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1582 MonoContext new_ctx;
1584 int clause_index_start = 0;
1585 gboolean unwind_res = TRUE;
1589 ji = jit_tls->resume_state.ji;
1590 new_ctx = jit_tls->resume_state.new_ctx;
1591 clause_index_start = jit_tls->resume_state.clause_index;
1592 lmf = jit_tls->resume_state.lmf;
1593 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1594 filter_idx = jit_tls->resume_state.filter_idx;
1596 StackFrameInfo frame;
1598 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1600 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1601 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1602 frame.type == FRAME_TYPE_TRAMPOLINE) {
1606 g_assert (frame.type == FRAME_TYPE_MANAGED);
1612 *(mono_get_lmf_addr ()) = lmf;
1614 jit_tls->abort_func (obj);
1615 g_assert_not_reached ();
1618 method = jinfo_get_method (ji);
1620 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1622 if (stack_overflow) {
1623 if (DOES_STACK_GROWS_UP)
1624 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1626 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1628 free_stack = 0xffffff;
1631 for (i = clause_index_start; i < ji->num_clauses; i++) {
1632 MonoJitExceptionInfo *ei = &ji->clauses [i];
1633 gboolean filtered = FALSE;
1636 * During stack overflow, wait till the unwinding frees some stack
1637 * space before running handlers/finalizers.
1639 if (free_stack <= (64 * 1024))
1642 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1644 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1647 * Have to unwrap RuntimeWrappedExceptions if the
1648 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1650 if (non_exception && !wrap_non_exception_throws (method))
1651 ex_obj = non_exception;
1655 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1656 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1657 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1659 g_assert (!ji->from_llvm);
1660 /* store the exception object in bp + ei->exvar_offset */
1661 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1665 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1667 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1670 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1672 * Filter clauses should only be run in the
1673 * first pass of exception handling.
1675 filtered = (filter_idx == first_filter_idx);
1679 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1680 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1682 * This guards against the situation that we abort a thread that is executing a finally clause
1683 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1684 * check for this situation here and resume interruption if we are below the guarded block.
1686 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1687 gboolean is_outside = FALSE;
1688 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1689 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1690 //FIXME make this stack direction aware
1691 if (catch_bp > prot_bp) {
1693 } else if (catch_bp == prot_bp) {
1694 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1695 * So we check if the catch handler_start is protected by the guarded handler protected region
1698 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1699 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1700 * There aren't any further finally/fault handler blocks down the stack over this exception.
1701 * This must be ensured by the code that installs the guard trampoline.
1703 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1705 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1710 jit_tls->handler_block_return_address = NULL;
1711 jit_tls->handler_block = NULL;
1712 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1716 if (mono_trace_is_enabled () && mono_trace_eval (method))
1717 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1718 jit_tls->orig_ex_ctx_set = TRUE;
1719 mono_profiler_exception_clause_handler (method, ei->flags, i);
1720 jit_tls->orig_ex_ctx_set = FALSE;
1721 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1723 #ifndef DISABLE_PERFCOUNTERS
1724 mono_perfcounters->exceptions_depth += frame_count;
1726 if (obj == domain->stack_overflow_ex)
1727 jit_tls->handling_stack_ovf = FALSE;
1731 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1732 if (mono_trace_is_enabled () && mono_trace_eval (method))
1733 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1734 jit_tls->orig_ex_ctx_set = TRUE;
1735 mono_profiler_exception_clause_handler (method, ei->flags, i);
1736 jit_tls->orig_ex_ctx_set = FALSE;
1737 call_filter (ctx, ei->handler_start);
1739 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1740 if (mono_trace_is_enabled () && mono_trace_eval (method))
1741 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1742 jit_tls->orig_ex_ctx_set = TRUE;
1743 mono_profiler_exception_clause_handler (method, ei->flags, i);
1744 jit_tls->orig_ex_ctx_set = FALSE;
1745 #ifndef DISABLE_PERFCOUNTERS
1746 mono_perfcounters->exceptions_finallys++;
1749 if (ji->from_llvm) {
1751 * LLVM compiled finally handlers follow the design
1752 * of the c++ ehabi, i.e. they call a resume function
1753 * at the end instead of returning to the caller.
1754 * So save the exception handling state,
1755 * mono_resume_unwind () will call us again to continue
1758 jit_tls->resume_state.ex_obj = obj;
1759 jit_tls->resume_state.ji = ji;
1760 jit_tls->resume_state.clause_index = i + 1;
1761 jit_tls->resume_state.ctx = *ctx;
1762 jit_tls->resume_state.new_ctx = new_ctx;
1763 jit_tls->resume_state.lmf = lmf;
1764 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1765 jit_tls->resume_state.filter_idx = filter_idx;
1766 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1769 call_filter (ctx, ei->handler_start);
1775 jit_tls->orig_ex_ctx_set = TRUE;
1776 mono_profiler_exception_method_leave (method);
1777 jit_tls->orig_ex_ctx_set = FALSE;
1782 g_assert_not_reached ();
1786 * mono_debugger_run_finally:
1787 * @start_ctx: saved processor state
1789 * This method is called by the Mono Debugger to call all `finally' clauses of the
1790 * current stack frame. It's used when the user issues a `return' command to make
1791 * the current stack frame return. After returning from this method, the debugger
1792 * unwinds the stack one frame and gives control back to the user.
1794 * NOTE: This method is only used when running inside the Mono Debugger.
1797 mono_debugger_run_finally (MonoContext *start_ctx)
1799 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1800 MonoDomain *domain = mono_domain_get ();
1801 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1802 MonoLMF *lmf = mono_get_lmf ();
1803 MonoContext ctx, new_ctx;
1804 MonoJitInfo *ji, rji;
1809 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1810 if (!ji || ji == (gpointer)-1)
1814 call_filter = mono_get_call_filter ();
1816 for (i = 0; i < ji->num_clauses; i++) {
1817 MonoJitExceptionInfo *ei = &ji->clauses [i];
1819 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1820 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1821 call_filter (&ctx, ei->handler_start);
1827 * mono_handle_exception:
1828 * @ctx: saved processor state
1829 * @obj: the exception object
1832 mono_handle_exception (MonoContext *ctx, gpointer obj)
1834 #ifndef DISABLE_PERFCOUNTERS
1835 mono_perfcounters->exceptions_thrown++;
1838 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1841 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1843 #ifndef MONO_ARCH_USE_SIGACTION
1844 #error "Can't use sigaltstack without sigaction"
1847 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1850 mono_setup_altstack (MonoJitTlsData *tls)
1854 guint8 *staddr = NULL;
1856 if (mono_running_on_valgrind ())
1859 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1863 tls->end_of_stack = staddr + stsize;
1864 tls->stack_size = stsize;
1866 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1868 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1869 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1871 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1873 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1874 /* mprotect can fail for the main thread stack */
1875 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);
1876 g_assert (gaddr == tls->stack_ovf_guard_base);
1877 tls->stack_ovf_valloced = TRUE;
1880 /* Setup an alternate signal stack */
1881 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1882 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1884 g_assert (tls->signal_stack);
1886 sa.ss_sp = tls->signal_stack;
1887 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1889 g_assert (sigaltstack (&sa, NULL) == 0);
1891 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);
1895 mono_free_altstack (MonoJitTlsData *tls)
1900 sa.ss_sp = tls->signal_stack;
1901 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1902 sa.ss_flags = SS_DISABLE;
1903 err = sigaltstack (&sa, NULL);
1904 g_assert (err == 0);
1906 if (tls->signal_stack)
1907 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1908 if (tls->stack_ovf_valloced)
1909 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1911 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1914 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1917 mono_setup_altstack (MonoJitTlsData *tls)
1922 mono_free_altstack (MonoJitTlsData *tls)
1926 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1929 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1931 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1932 /* we need to leave some room for throwing the exception */
1933 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1934 unprotect_size -= mono_pagesize ();
1935 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1936 * is sufficient stack
1938 //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);
1940 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1941 return unprotect_size == jit_tls->stack_ovf_guard_size;
1944 static G_GNUC_UNUSED void
1945 try_more_restore (void)
1947 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1948 if (try_restore_stack_protection (jit_tls, 500))
1949 jit_tls->restore_stack_prot = NULL;
1952 static G_GNUC_UNUSED void
1953 restore_stack_protection (void)
1955 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1956 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1957 /* if we can't restore the stack protection, keep a callback installed so
1958 * we'll try to restore as much stack as we can at each return from unmanaged
1961 if (try_restore_stack_protection (jit_tls, 4096))
1962 jit_tls->restore_stack_prot = NULL;
1964 jit_tls->restore_stack_prot = try_more_restore_tramp;
1965 /* here we also throw a stack overflow exception */
1966 ex->trace_ips = NULL;
1967 ex->stack_trace = NULL;
1968 mono_raise_exception (ex);
1972 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1974 void (*func)(void) = (gpointer)tramp_data;
1980 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1985 /* we got a stack overflow in the soft-guard pages
1986 * There are two cases:
1987 * 1) managed code caused the overflow: we unprotect the soft-guard page
1988 * and let the arch-specific code trigger the exception handling mechanism
1989 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1990 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1991 * and hope we can continue with those enabled, at least until the hard-guard page
1992 * is hit. The alternative to continuing here is to just print a message and abort.
1993 * We may add in the future the code to protect the pages again in the codepath
1994 * when we return from unmanaged to managed code.
1996 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1997 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1998 /* we unprotect the minimum amount we can */
2000 gboolean handled = FALSE;
2002 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2003 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2004 guard_size -= mono_pagesize ();
2006 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2007 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2008 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);
2009 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2011 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2016 /* We print a message: after this even managed stack overflows
2017 * may crash the runtime
2019 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2020 if (!jit_tls->handling_stack_ovf) {
2021 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2022 jit_tls->handling_stack_ovf = 1;
2024 /*fprintf (stderr, "Already handling stack overflow\n");*/
2033 MonoMethod *omethod;
2035 } PrintOverflowUserData;
2037 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2039 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2041 MonoMethod *method = NULL;
2042 PrintOverflowUserData *user_data = data;
2045 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2046 method = jinfo_get_method (frame->ji);
2049 if (user_data->count == 0) {
2050 /* The first frame is in its prolog, so a line number cannot be computed */
2051 user_data->count ++;
2055 /* If this is a one method overflow, skip the other instances */
2056 if (method == user_data->omethod)
2059 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2060 mono_runtime_printf_err (" %s", location);
2063 if (user_data->count == 1) {
2064 mono_runtime_printf_err (" <...>");
2065 user_data->omethod = method;
2067 user_data->omethod = NULL;
2070 user_data->count ++;
2072 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2079 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2081 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2082 PrintOverflowUserData ud;
2086 /* we don't do much now, but we can warn the user with a useful message */
2087 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2089 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2090 mono_sigctx_to_monoctx (ctx, &mctx);
2092 mono_runtime_printf_err ("Stacktrace:");
2094 memset (&ud, 0, sizeof (ud));
2096 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2098 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2099 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2101 mono_runtime_printf_err ("At <unmanaged>.");
2108 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2110 MonoMethod *method = NULL;
2112 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2113 method = jinfo_get_method (frame->ji);
2116 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2117 mono_runtime_printf_err (" %s", location);
2120 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2125 static G_GNUC_UNUSED gboolean
2126 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2128 GString *p = (GString*)data;
2129 MonoMethod *method = NULL;
2131 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2132 method = jinfo_get_method (frame->ji);
2134 if (method && frame->domain) {
2135 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2136 g_string_append_printf (p, " %s\n", location);
2139 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2144 #ifndef MONO_CROSS_COMPILE
2146 static gboolean handling_sigsegv = FALSE;
2149 * mono_handle_native_sigsegv:
2151 * Handle a SIGSEGV received while in native code by printing diagnostic
2152 * information and aborting.
2155 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2157 #ifdef MONO_ARCH_USE_SIGACTION
2158 struct sigaction sa;
2160 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2161 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2163 if (handling_sigsegv)
2166 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2167 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2178 /* To prevent infinite loops when the stack walk causes a crash */
2179 handling_sigsegv = TRUE;
2181 /* !jit_tls means the thread was not registered with the runtime */
2182 if (jit_tls && mono_thread_internal_current ()) {
2183 mono_runtime_printf_err ("Stacktrace:\n");
2185 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2188 #ifdef HAVE_BACKTRACE_SYMBOLS
2194 mono_runtime_printf_err ("\nNative stacktrace:\n");
2196 size = backtrace (array, 256);
2197 names = backtrace_symbols (array, size);
2198 for (i =0; i < size; ++i) {
2199 mono_runtime_printf_err ("\t%s", names [i]);
2203 /* Try to get more meaningful information using gdb */
2205 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2206 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2207 /* From g_spawn_command_line_sync () in eglib */
2210 pid_t crashed_pid = getpid ();
2214 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2215 * it will deadlock. Call the syscall directly instead.
2217 pid = mono_runtime_syscall_fork ();
2218 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2220 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2221 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2222 // distributions set the scope to 1 which allows attaching only to direct children of
2223 // the current process
2224 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2228 dup2 (STDERR_FILENO, STDOUT_FILENO);
2230 mono_gdb_render_native_backtraces (crashed_pid);
2234 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2235 waitpid (pid, &status, 0);
2239 #elif defined (ENABLE_EXTENSION_MODULE)
2240 mono_extension_handle_native_sigsegv (ctx, info);
2244 * A SIGSEGV indicates something went very wrong so we can no longer depend
2245 * on anything working. So try to print out lots of diagnostics, starting
2246 * with ones which have a greater chance of working.
2248 mono_runtime_printf_err (
2250 "=================================================================\n"
2251 "Got a %s while executing native code. This usually indicates\n"
2252 "a fatal error in the mono runtime or one of the native libraries \n"
2253 "used by your application.\n"
2254 "=================================================================\n",
2258 #ifdef MONO_ARCH_USE_SIGACTION
2260 /* Remove our SIGABRT handler */
2261 sa.sa_handler = SIG_DFL;
2262 sigemptyset (&sa.sa_mask);
2265 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2269 if (!mono_do_crash_chaining) {
2270 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2271 #if defined (PLATFORM_ANDROID)
2282 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2284 g_assert_not_reached ();
2287 #endif /* !MONO_CROSS_COMPILE */
2290 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2292 MonoInternalThread *thread = mono_thread_internal_current ();
2293 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2301 GError *error = NULL;
2306 text = g_string_new (0);
2308 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2310 g_string_append_printf (text, "\n\"%s\"", name);
2313 else if (thread->threadpool_thread)
2314 g_string_append (text, "\n\"<threadpool thread>\"");
2316 g_string_append (text, "\n\"<unnamed thread>\"");
2319 wapi_desc = wapi_current_thread_desc ();
2320 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2324 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2326 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2328 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2330 mono_sigctx_to_monoctx (sigctx, &ctx);
2332 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2334 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2337 mono_runtime_printf ("%s", text->str);
2339 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2340 OutputDebugStringA(text->str);
2343 g_string_free (text, TRUE);
2344 mono_runtime_stdout_fflush ();
2348 * mono_print_thread_dump:
2350 * Print information about the current thread to stdout.
2351 * SIGCTX can be NULL, allowing this to be called from gdb.
2354 mono_print_thread_dump (void *sigctx)
2356 mono_print_thread_dump_internal (sigctx, NULL);
2360 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2362 mono_print_thread_dump_internal (NULL, ctx);
2366 * mono_resume_unwind:
2368 * This is called by a trampoline from LLVM compiled finally clauses to continue
2372 mono_resume_unwind (MonoContext *ctx)
2374 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2375 MonoContext new_ctx;
2377 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2378 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2381 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2383 mono_restore_context (&new_ctx);
2386 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2391 MonoJitExceptionInfo *ei;
2392 } FindHandlerBlockData;
2395 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2399 FindHandlerBlockData *pdata = data;
2400 MonoJitInfo *ji = frame->ji;
2405 ip = MONO_CONTEXT_GET_IP (ctx);
2407 for (i = 0; i < ji->num_clauses; ++i) {
2408 MonoJitExceptionInfo *ei = ji->clauses + i;
2409 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2411 /*If ip points to the first instruction it means the handler block didn't start
2412 so we can leave its execution to the EH machinery*/
2413 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2425 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2428 MonoJitExceptionInfo *clause = NULL;
2431 ip = MONO_CONTEXT_GET_IP (ctx);
2433 for (i = 0; i < ji->num_clauses; ++i) {
2434 clause = &ji->clauses [i];
2435 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2437 if (clause->handler_start < ip && clause->data.handler_end > ip)
2441 /*no matching finally */
2442 if (i == ji->num_clauses)
2445 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2446 if (ip == clause->handler_start)
2449 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2453 * Finds the bottom handler block running and install a block guard if needed.
2454 * FIXME add full-aot support.
2457 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2459 FindHandlerBlockData data = { 0 };
2460 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2467 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2468 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2470 if (!jit_tls || jit_tls->handler_block_return_address)
2473 /* Do an async safe stack walk */
2474 mono_thread_info_set_is_async_context (TRUE);
2475 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2476 mono_thread_info_set_is_async_context (FALSE);
2481 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2483 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2484 if (resume_ip == NULL)
2487 jit_tls->handler_block_return_address = resume_ip;
2488 jit_tls->handler_block = data.ei;
2495 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2503 mono_set_cast_details (MonoClass *from, MonoClass *to)
2505 MonoJitTlsData *jit_tls = NULL;
2507 if (mini_get_debug_options ()->better_cast_details) {
2508 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2509 jit_tls->class_cast_from = from;
2510 jit_tls->class_cast_to = to;
2515 /*returns false if the thread is not attached*/
2517 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2519 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2520 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2528 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2530 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2531 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2532 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2535 mono_thread_state_init (ctx);
2538 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2544 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2550 mono_thread_state_init (MonoThreadUnwindState *ctx)
2552 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2554 #if defined(MONO_CROSS_COMPILE)
2555 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2556 #elif MONO_ARCH_HAS_MONO_CONTEXT
2557 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2559 g_error ("Use a null sigctx requires a working mono-context");
2562 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2563 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2564 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2570 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2572 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2579 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2580 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2581 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2586 /*returns false if the thread is not attached*/
2588 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2590 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2591 MONO_ARCH_CONTEXT_DEF
2593 mono_arch_flush_register_windows ();
2595 if (!thread || !thread->jit_data) {
2599 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2600 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2602 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2605 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2606 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2607 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2613 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2615 mono_handle_exception (ctx, exc);
2616 mono_restore_context (ctx);
2619 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2621 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2623 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2624 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2625 jit_tls->ex_ctx = *ctx;
2627 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2629 g_error ("This target doesn't support mono_arch_setup_async_callback");
2634 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2636 unhandled_exception_hook = func;
2637 unhandled_exception_hook_data = user_data;
2641 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2643 if (unhandled_exception_hook) {
2644 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2646 MonoObject *other = NULL;
2647 MonoString *str = mono_object_to_string (exc, &other);
2651 msg = mono_string_to_utf8 (str);
2653 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2654 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2656 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2657 original_backtrace, nested_backtrace);
2659 g_free (original_backtrace);
2660 g_free (nested_backtrace);
2662 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2664 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2666 #if defined(HOST_IOS)
2667 g_assertion_message ("Terminating runtime due to unhandled exception");
2669 exit (mono_environment_exitcode_get ());
2673 g_assert_not_reached ();
2677 * mono_restore_context:
2679 * Call the architecture specific restore context function.
2682 mono_restore_context (MonoContext *ctx)
2684 static void (*restore_context) (MonoContext *);
2686 if (!restore_context)
2687 restore_context = mono_get_restore_context ();
2688 restore_context (ctx);
2689 g_assert_not_reached ();
2693 * mono_jinfo_get_unwind_info:
2695 * Return the unwind info for JI.
2698 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2701 return mono_aot_get_unwind_info (ji, unwind_info_len);
2703 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2707 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2709 MonoArchEHJitInfo *info;
2711 info = mono_jit_info_get_arch_eh_info (ji);
2714 return info->epilog_size;
2718 * LLVM/Bitcode exception handling.
2721 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2724 static gboolean show_native_addresses = TRUE;
2726 static gboolean show_native_addresses = FALSE;
2729 static _Unwind_Reason_Code
2730 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
2732 MonoDomain *domain = mono_domain_get ();
2733 uintptr_t ip = _Unwind_GetIP (frame_ctx);
2735 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
2736 GList **trace_ips = (GList **)state;
2737 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
2740 return _URC_NO_REASON;
2746 throw_exception (MonoObject *ex, gboolean rethrow)
2748 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2749 MonoException *mono_ex;
2751 if (!mono_object_isinst (ex, mono_defaults.exception_class))
2752 mono_ex = mono_get_exception_runtime_wrapped (ex);
2754 mono_ex = (MonoException*)ex;
2757 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2760 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2761 GList *l, *ips = NULL;
2764 _Unwind_Backtrace (build_stack_trace, &ips);
2765 /* The list contains gshared info-ip pairs */
2767 ips = g_list_reverse (ips);
2768 for (l = ips; l; l = l->next) {
2770 trace = g_list_append (trace, l->data);
2771 trace = g_list_append (trace, NULL);
2773 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace, mono_defaults.int_class));
2775 g_list_free (trace);
2779 mono_llvm_cpp_throw_exception ();
2783 mono_llvm_throw_exception (MonoObject *ex)
2785 throw_exception (ex, FALSE);
2789 mono_llvm_rethrow_exception (MonoObject *ex)
2791 throw_exception (ex, TRUE);
2795 mono_llvm_raise_exception (MonoException *e)
2797 mono_llvm_throw_exception ((MonoObject*)e);
2801 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2803 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2806 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2808 mono_llvm_throw_exception ((MonoObject*)ex);
2812 * mono_llvm_resume_exception:
2814 * Resume exception propagation.
2817 mono_llvm_resume_exception (void)
2819 mono_llvm_cpp_throw_exception ();
2823 * mono_llvm_load_exception:
2825 * Return the currently thrown exception.
2828 mono_llvm_load_exception (void)
2830 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2832 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2833 g_assert (mono_ex->trace_ips);
2835 GList *trace_ips = NULL;
2836 gpointer ip = __builtin_return_address (0);
2838 size_t upper = mono_array_length (mono_ex->trace_ips);
2840 for (int i = 0; i < upper; i++) {
2841 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2842 trace_ips = g_list_prepend (trace_ips, curr_ip);
2848 // FIXME: Does this work correctly for rethrows?
2849 // We may be discarding useful information
2850 // when this gets GC'ed
2851 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace_ips, mono_defaults.int_class));
2852 g_list_free (trace_ips);
2855 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2857 return &mono_ex->object;
2861 * mono_llvm_clear_exception:
2863 * Mark the currently thrown exception as handled.
2866 mono_llvm_clear_exception (void)
2868 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2869 mono_gchandle_free (jit_tls->thrown_exc);
2870 jit_tls->thrown_exc = 0;
2872 mono_memory_barrier ();
2876 * mono_llvm_match_exception:
2878 * Return the innermost clause containing REGION_START-REGION_END which can handle
2879 * the current exception.
2882 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end)
2884 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2888 g_assert (jit_tls->thrown_exc);
2889 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
2890 for (int i = 0; i < jinfo->num_clauses; i++) {
2891 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
2893 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
2896 // FIXME: Handle edge cases handled in get_exception_catch_class
2897 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (exc, ei->data.catch_class)) {
2898 index = ei->clause_index;
2900 } else if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2901 g_assert_not_reached ();
2910 mono_debug_personality (int a, _Unwind_Action b,
2911 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
2913 g_assert_not_reached ();
2917 mono_debug_personality (void);
2920 mono_debug_personality (void)
2922 g_assert_not_reached ();