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 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
820 mono_walk_stack_full (func,
822 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
823 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
824 state->unwind_data [MONO_UNWIND_DATA_LMF],
825 unwind_options, user_data);
829 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
831 MonoThreadUnwindState state;
832 if (!mono_thread_state_init_from_current (&state))
834 mono_walk_stack_with_state (func, &state, options, user_data);
838 * mono_walk_stack_full:
839 * @func: callback to call for each stack frame
840 * @domain: starting appdomain, can be NULL to use the current domain
841 * @unwind_options: what extra information the unwinder should gather
842 * @start_ctx: starting state of the stack walk, can be NULL.
843 * @thread: the thread whose stack to walk, can be NULL to use the current thread
844 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
845 * @user_data: data passed to the callback
847 * This function walks the stack of a thread, starting from the state
848 * represented by start_ctx. For each frame the callback
849 * function is called with the relevant info. The walk ends when no more
850 * managed stack frames are found or when the callback returns a TRUE value.
853 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
856 MonoContext ctx, new_ctx;
857 StackFrameInfo frame;
859 mgreg_t *reg_locations [MONO_MAX_IREGS];
860 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
861 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
862 gboolean async = mono_thread_info_is_async_context ();
864 g_assert (start_ctx);
867 /*The LMF will be null if the target have no managed frames.*/
868 /* g_assert (lmf); */
871 g_assert (unwind_options == MONO_UNWIND_NONE);
873 memcpy (&ctx, start_ctx, sizeof (MonoContext));
874 memset (reg_locations, 0, sizeof (reg_locations));
876 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
878 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
882 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
883 MonoDebugSourceLocation *source;
885 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
887 il_offset = source->il_offset;
890 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
891 il_offset = sp.il_offset;
895 mono_debug_free_source_location (source);
899 frame.il_offset = il_offset;
901 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
902 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
904 frame.actual_method = frame.method;
907 if (get_reg_locations)
908 frame.reg_locations = reg_locations;
910 if (func (&frame, &ctx, user_data))
913 if (get_reg_locations) {
914 for (i = 0; i < MONO_MAX_IREGS; ++i)
915 if (new_reg_locations [i])
916 reg_locations [i] = new_reg_locations [i];
924 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
925 MonoReflectionMethod **method,
926 gint32 *iloffset, gint32 *native_offset,
927 MonoString **file, gint32 *line, gint32 *column)
929 MonoDomain *domain = mono_domain_get ();
930 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
931 MonoLMF *lmf = mono_get_lmf ();
932 MonoJitInfo *ji = NULL;
933 MonoContext ctx, new_ctx;
934 MonoDebugSourceLocation *location;
935 MonoMethod *jmethod = NULL, *actual_method;
936 StackFrameInfo frame;
939 MONO_ARCH_CONTEXT_DEF;
941 mono_arch_flush_register_windows ();
943 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
944 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
946 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
952 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
956 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
957 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
958 frame.type == FRAME_TYPE_TRAMPOLINE)
962 *native_offset = frame.native_offset;
964 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
965 jmethod = jinfo_get_method (ji);
966 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
971 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
973 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
975 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
977 *iloffset = location->il_offset;
981 if (need_file_info) {
983 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
984 *line = location->row;
985 *column = location->column;
992 mono_debug_free_source_location (location);
998 glist_to_array (GList *list, MonoClass *eclass)
1000 MonoDomain *domain = mono_domain_get ();
1007 len = g_list_length (list);
1008 res = mono_array_new (domain, eclass, len);
1010 for (i = 0; list; list = list->next, i++)
1011 mono_array_set (res, gpointer, i, list->data);
1017 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1019 MonoClass *catch_class = ei->data.catch_class;
1020 MonoType *inflated_type;
1021 MonoGenericContext context;
1023 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1024 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1027 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1029 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1031 /* FIXME: we shouldn't inflate but instead put the
1032 type in the rgctx and fetch it from there. It
1033 might be a good idea to do this lazily, i.e. only
1034 when the exception is actually thrown, so as not to
1035 waste space for exception clauses which might never
1037 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1038 catch_class = mono_class_from_mono_type (inflated_type);
1039 mono_metadata_free_type (inflated_type);
1045 * mini_jit_info_table_find_ext:
1047 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1048 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1049 * OUT_DOMAIN if it is not NULL.
1052 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1055 MonoInternalThread *t = mono_thread_internal_current ();
1061 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1064 *out_domain = domain;
1068 /* maybe it is shared code, so we also search in the root domain */
1069 if (domain != mono_get_root_domain ()) {
1070 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1073 *out_domain = mono_get_root_domain ();
1081 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1082 for (; refs && *refs; refs++) {
1083 if (*refs != domain && *refs != mono_get_root_domain ()) {
1084 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1087 *out_domain = (MonoDomain*) *refs;
1097 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1099 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1103 * wrap_non_exception_throws:
1105 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1106 * WrapNonExceptionThrows flag set.
1109 wrap_non_exception_throws (MonoMethod *m)
1111 MonoAssembly *ass = m->klass->image->assembly;
1112 MonoCustomAttrInfo* attrs;
1113 static MonoClass *klass;
1115 gboolean val = FALSE;
1118 if (ass->wrap_non_exception_throws_inited)
1119 return ass->wrap_non_exception_throws;
1121 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1123 attrs = mono_custom_attrs_from_assembly (ass);
1125 for (i = 0; i < attrs->num_attrs; ++i) {
1126 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1128 int num_named, named_type, name_len;
1131 if (!attr->ctor || attr->ctor->klass != klass)
1133 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1134 p = (const char*)attr->data;
1135 g_assert (read16 (p) == 0x0001);
1137 num_named = read16 (p);
1143 /* data_type = *p; */
1146 if (named_type != 0x54)
1148 name_len = mono_metadata_decode_blob_size (p, &p);
1149 name = g_malloc (name_len + 1);
1150 memcpy (name, p, name_len);
1151 name [name_len] = 0;
1153 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1155 /* The value is a BOOLEAN */
1158 mono_custom_attrs_free (attrs);
1161 ass->wrap_non_exception_throws = val;
1162 mono_memory_barrier ();
1163 ass->wrap_non_exception_throws_inited = TRUE;
1168 #ifndef MONO_ARCH_STACK_GROWS_UP
1169 #define DOES_STACK_GROWS_UP 1
1171 #define DOES_STACK_GROWS_UP 0
1174 #define MAX_UNMANAGED_BACKTRACE 128
1176 build_native_trace (void)
1178 /* This puppy only makes sense on mobile, IOW, ARM. */
1179 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1181 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1182 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1187 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1189 for (i = 0; i < size; i++)
1190 mono_array_set (res, gpointer, i, native_trace [i]);
1197 #define setup_managed_stacktrace_information() do { \
1198 if (mono_ex && !initial_trace_ips) { \
1199 trace_ips = g_list_reverse (trace_ips); \
1200 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1201 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1202 if (has_dynamic_methods) \
1203 /* These methods could go away anytime, so compute the stack trace now */ \
1204 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1206 g_list_free (trace_ips); \
1210 * mono_handle_exception_internal_first_pass:
1212 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1213 * OBJ is found. Run the index of the filter clause which caught the exception into
1214 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1217 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1219 MonoDomain *domain = mono_domain_get ();
1220 MonoJitInfo *ji = NULL;
1221 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1222 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1223 MonoLMF *lmf = mono_get_lmf ();
1224 MonoArray *initial_trace_ips = NULL;
1225 GList *trace_ips = NULL;
1226 MonoException *mono_ex;
1227 gboolean stack_overflow = FALSE;
1228 MonoContext initial_ctx;
1230 int frame_count = 0;
1231 gboolean has_dynamic_methods = FALSE;
1236 g_assert (ctx != NULL);
1238 if (obj == domain->stack_overflow_ex)
1239 stack_overflow = TRUE;
1241 mono_ex = (MonoException*)obj;
1242 initial_trace_ips = mono_ex->trace_ips;
1244 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1245 mono_ex = (MonoException*)obj;
1246 initial_trace_ips = mono_ex->trace_ips;
1252 call_filter = mono_get_call_filter ();
1254 g_assert (jit_tls->end_of_stack);
1255 g_assert (jit_tls->abort_func);
1258 *out_filter_idx = -1;
1262 *out_prev_ji = NULL;
1267 MonoContext new_ctx;
1269 int clause_index_start = 0;
1270 gboolean unwind_res = TRUE;
1272 StackFrameInfo frame;
1277 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1279 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1280 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1281 frame.type == FRAME_TYPE_TRAMPOLINE) {
1285 g_assert (frame.type == FRAME_TYPE_MANAGED);
1290 setup_managed_stacktrace_information ();
1295 method = jinfo_get_method (ji);
1296 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1298 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1299 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1300 "The native frame called the managed method:\n%s\n",
1301 mono_method_full_name (method, TRUE));
1304 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1306 * Avoid overwriting the stack trace if the exception is
1307 * rethrown. Also avoid giant stack traces during a stack
1310 if (!initial_trace_ips && (frame_count < 1000)) {
1311 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1312 trace_ips = g_list_prepend (trace_ips,
1313 get_generic_info_from_stack_frame (ji, ctx));
1317 if (method->dynamic)
1318 has_dynamic_methods = TRUE;
1320 if (stack_overflow) {
1321 if (DOES_STACK_GROWS_UP)
1322 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1324 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1326 free_stack = 0xffffff;
1329 for (i = clause_index_start; i < ji->num_clauses; i++) {
1330 MonoJitExceptionInfo *ei = &ji->clauses [i];
1331 gboolean filtered = FALSE;
1334 * During stack overflow, wait till the unwinding frees some stack
1335 * space before running handlers/finalizers.
1337 if (free_stack <= (64 * 1024))
1340 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1342 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1345 * Have to unwrap RuntimeWrappedExceptions if the
1346 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1348 if (non_exception && !wrap_non_exception_throws (method))
1349 ex_obj = non_exception;
1353 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1354 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1355 #ifndef DISABLE_PERFCOUNTERS
1356 mono_perfcounters->exceptions_filters++;
1359 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1360 trim the stackframe since if it returns FALSE we lose information.
1362 FIXME Not 100% sure if it's a good idea even with user clauses.
1365 setup_managed_stacktrace_information ();
1367 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1369 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1371 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1372 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1374 g_assert (!ji->from_llvm);
1375 /* store the exception object in bp + ei->exvar_offset */
1376 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1379 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1381 * Pass the original il clause index to the landing pad so it can
1382 * branch to the landing pad associated with the il clause.
1383 * This is needed because llvm compiled code assumes that the EH
1384 * code always branches to the innermost landing pad.
1387 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1390 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1391 filtered = call_filter (ctx, ei->data.filter);
1392 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1393 if (filtered && out_filter_idx)
1394 *out_filter_idx = filter_idx;
1401 setup_managed_stacktrace_information ();
1402 /* mono_debugger_agent_handle_exception () needs this */
1403 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1408 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1409 setup_managed_stacktrace_information ();
1414 /* mono_debugger_agent_handle_exception () needs this */
1415 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1424 g_assert_not_reached ();
1428 * mono_handle_exception_internal:
1429 * @ctx: saved processor state
1430 * @obj: the exception object
1431 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1434 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1436 MonoDomain *domain = mono_domain_get ();
1437 MonoJitInfo *ji, *prev_ji;
1438 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1439 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1440 MonoLMF *lmf = mono_get_lmf ();
1441 MonoException *mono_ex;
1442 gboolean stack_overflow = FALSE;
1443 MonoContext initial_ctx;
1445 int frame_count = 0;
1446 gint32 filter_idx, first_filter_idx = 0;
1449 MonoObject *non_exception = NULL;
1451 g_assert (ctx != NULL);
1453 MonoException *ex = mono_get_exception_null_reference ();
1454 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1455 obj = (MonoObject *)ex;
1459 * Allocate a new exception object instead of the preconstructed ones.
1461 if (obj == domain->stack_overflow_ex) {
1463 * It is not a good idea to try and put even more pressure on the little stack available.
1464 * obj = mono_get_exception_stack_overflow ();
1466 stack_overflow = TRUE;
1468 else if (obj == domain->null_reference_ex) {
1469 obj = mono_get_exception_null_reference ();
1472 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1473 non_exception = obj;
1474 obj = mono_get_exception_runtime_wrapped (obj);
1477 mono_ex = (MonoException*)obj;
1479 if (mini_get_debug_options ()->suspend_on_exception) {
1480 mono_runtime_printf_err ("Exception thrown, suspending...");
1485 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1486 mono_ex = (MonoException*)obj;
1491 if (mono_ex && jit_tls->class_cast_from) {
1492 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1493 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1494 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1495 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1496 mono_ex->message = mono_string_new (domain, msg);
1501 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1502 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1503 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1504 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1505 mono_ex->message = mono_string_new (domain, msg);
1513 call_filter = mono_get_call_filter ();
1515 g_assert (jit_tls->end_of_stack);
1516 g_assert (jit_tls->abort_func);
1519 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1520 * end up being TRUE on any code path.
1522 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1527 MonoContext ctx_cp = *ctx;
1528 if (mono_trace_is_enabled ()) {
1529 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1530 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1531 MonoObject *message;
1532 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1534 MonoObject *exc = NULL;
1535 if (get_message == NULL) {
1537 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1539 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1541 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1545 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1547 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1549 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1550 mono_print_thread_dump_from_ctx (ctx);
1552 jit_tls->orig_ex_ctx_set = TRUE;
1553 mono_profiler_exception_thrown (obj);
1554 jit_tls->orig_ex_ctx_set = FALSE;
1556 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1559 if (mini_get_debug_options ()->break_on_exc)
1561 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1563 if (mini_get_debug_options ()->suspend_on_unhandled) {
1564 mono_runtime_printf_err ("Unhandled exception, suspending...");
1569 // FIXME: This runs managed code so it might cause another stack overflow when
1570 // we are handling a stack overflow
1571 mono_unhandled_exception (obj);
1573 gboolean unhandled = FALSE;
1576 * The exceptions caught by the mono_runtime_invoke () calls
1577 * in the threadpool needs to be treated as unhandled (#669836).
1579 * FIXME: The check below is hackish, but its hard to distinguish
1580 * these runtime invoke calls from others in the runtime.
1582 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1583 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1588 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1590 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1600 MonoContext new_ctx;
1602 int clause_index_start = 0;
1603 gboolean unwind_res = TRUE;
1607 ji = jit_tls->resume_state.ji;
1608 new_ctx = jit_tls->resume_state.new_ctx;
1609 clause_index_start = jit_tls->resume_state.clause_index;
1610 lmf = jit_tls->resume_state.lmf;
1611 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1612 filter_idx = jit_tls->resume_state.filter_idx;
1614 StackFrameInfo frame;
1616 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1618 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1619 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1620 frame.type == FRAME_TYPE_TRAMPOLINE) {
1624 g_assert (frame.type == FRAME_TYPE_MANAGED);
1630 *(mono_get_lmf_addr ()) = lmf;
1632 jit_tls->abort_func (obj);
1633 g_assert_not_reached ();
1636 method = jinfo_get_method (ji);
1638 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1640 if (stack_overflow) {
1641 if (DOES_STACK_GROWS_UP)
1642 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1644 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1646 free_stack = 0xffffff;
1649 for (i = clause_index_start; i < ji->num_clauses; i++) {
1650 MonoJitExceptionInfo *ei = &ji->clauses [i];
1651 gboolean filtered = FALSE;
1654 * During stack overflow, wait till the unwinding frees some stack
1655 * space before running handlers/finalizers.
1657 if (free_stack <= (64 * 1024))
1660 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1662 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1665 * Have to unwrap RuntimeWrappedExceptions if the
1666 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1668 if (non_exception && !wrap_non_exception_throws (method))
1669 ex_obj = non_exception;
1673 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1674 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1675 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1677 g_assert (!ji->from_llvm);
1678 /* store the exception object in bp + ei->exvar_offset */
1679 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1683 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1685 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1688 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1690 * Filter clauses should only be run in the
1691 * first pass of exception handling.
1693 filtered = (filter_idx == first_filter_idx);
1697 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1698 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1700 * This guards against the situation that we abort a thread that is executing a finally clause
1701 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1702 * check for this situation here and resume interruption if we are below the guarded block.
1704 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1705 gboolean is_outside = FALSE;
1706 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1707 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1708 //FIXME make this stack direction aware
1709 if (catch_bp > prot_bp) {
1711 } else if (catch_bp == prot_bp) {
1712 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1713 * So we check if the catch handler_start is protected by the guarded handler protected region
1716 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1717 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1718 * There aren't any further finally/fault handler blocks down the stack over this exception.
1719 * This must be ensured by the code that installs the guard trampoline.
1721 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1723 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1728 jit_tls->handler_block_return_address = NULL;
1729 jit_tls->handler_block = NULL;
1730 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1734 if (mono_trace_is_enabled () && mono_trace_eval (method))
1735 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1736 jit_tls->orig_ex_ctx_set = TRUE;
1737 mono_profiler_exception_clause_handler (method, ei->flags, i);
1738 jit_tls->orig_ex_ctx_set = FALSE;
1739 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1741 #ifndef DISABLE_PERFCOUNTERS
1742 mono_perfcounters->exceptions_depth += frame_count;
1744 if (obj == domain->stack_overflow_ex)
1745 jit_tls->handling_stack_ovf = FALSE;
1749 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1750 if (mono_trace_is_enabled () && mono_trace_eval (method))
1751 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1752 jit_tls->orig_ex_ctx_set = TRUE;
1753 mono_profiler_exception_clause_handler (method, ei->flags, i);
1754 jit_tls->orig_ex_ctx_set = FALSE;
1755 call_filter (ctx, ei->handler_start);
1757 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1758 if (mono_trace_is_enabled () && mono_trace_eval (method))
1759 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1760 jit_tls->orig_ex_ctx_set = TRUE;
1761 mono_profiler_exception_clause_handler (method, ei->flags, i);
1762 jit_tls->orig_ex_ctx_set = FALSE;
1763 #ifndef DISABLE_PERFCOUNTERS
1764 mono_perfcounters->exceptions_finallys++;
1767 if (ji->from_llvm) {
1769 * LLVM compiled finally handlers follow the design
1770 * of the c++ ehabi, i.e. they call a resume function
1771 * at the end instead of returning to the caller.
1772 * So save the exception handling state,
1773 * mono_resume_unwind () will call us again to continue
1776 jit_tls->resume_state.ex_obj = obj;
1777 jit_tls->resume_state.ji = ji;
1778 jit_tls->resume_state.clause_index = i + 1;
1779 jit_tls->resume_state.ctx = *ctx;
1780 jit_tls->resume_state.new_ctx = new_ctx;
1781 jit_tls->resume_state.lmf = lmf;
1782 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1783 jit_tls->resume_state.filter_idx = filter_idx;
1784 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1787 call_filter (ctx, ei->handler_start);
1793 jit_tls->orig_ex_ctx_set = TRUE;
1794 mono_profiler_exception_method_leave (method);
1795 jit_tls->orig_ex_ctx_set = FALSE;
1800 g_assert_not_reached ();
1804 * mono_debugger_run_finally:
1805 * @start_ctx: saved processor state
1807 * This method is called by the Mono Debugger to call all `finally' clauses of the
1808 * current stack frame. It's used when the user issues a `return' command to make
1809 * the current stack frame return. After returning from this method, the debugger
1810 * unwinds the stack one frame and gives control back to the user.
1812 * NOTE: This method is only used when running inside the Mono Debugger.
1815 mono_debugger_run_finally (MonoContext *start_ctx)
1817 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1818 MonoDomain *domain = mono_domain_get ();
1819 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1820 MonoLMF *lmf = mono_get_lmf ();
1821 MonoContext ctx, new_ctx;
1822 MonoJitInfo *ji, rji;
1827 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1828 if (!ji || ji == (gpointer)-1)
1832 call_filter = mono_get_call_filter ();
1834 for (i = 0; i < ji->num_clauses; i++) {
1835 MonoJitExceptionInfo *ei = &ji->clauses [i];
1837 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1838 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1839 call_filter (&ctx, ei->handler_start);
1845 * mono_handle_exception:
1846 * @ctx: saved processor state
1847 * @obj: the exception object
1850 mono_handle_exception (MonoContext *ctx, gpointer obj)
1852 #ifndef DISABLE_PERFCOUNTERS
1853 mono_perfcounters->exceptions_thrown++;
1856 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1859 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1861 #ifndef MONO_ARCH_USE_SIGACTION
1862 #error "Can't use sigaltstack without sigaction"
1865 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1868 mono_setup_altstack (MonoJitTlsData *tls)
1872 guint8 *staddr = NULL;
1874 if (mono_running_on_valgrind ())
1877 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1881 tls->end_of_stack = staddr + stsize;
1882 tls->stack_size = stsize;
1884 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1886 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1887 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1889 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1891 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1892 /* mprotect can fail for the main thread stack */
1893 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);
1894 g_assert (gaddr == tls->stack_ovf_guard_base);
1895 tls->stack_ovf_valloced = TRUE;
1898 /* Setup an alternate signal stack */
1899 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1900 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1902 g_assert (tls->signal_stack);
1904 sa.ss_sp = tls->signal_stack;
1905 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1907 g_assert (sigaltstack (&sa, NULL) == 0);
1909 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);
1913 mono_free_altstack (MonoJitTlsData *tls)
1918 sa.ss_sp = tls->signal_stack;
1919 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1920 sa.ss_flags = SS_DISABLE;
1921 err = sigaltstack (&sa, NULL);
1922 g_assert (err == 0);
1924 if (tls->signal_stack)
1925 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1926 if (tls->stack_ovf_valloced)
1927 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1929 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1932 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1935 mono_setup_altstack (MonoJitTlsData *tls)
1940 mono_free_altstack (MonoJitTlsData *tls)
1944 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1947 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1949 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1950 /* we need to leave some room for throwing the exception */
1951 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1952 unprotect_size -= mono_pagesize ();
1953 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1954 * is sufficient stack
1956 //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);
1958 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1959 return unprotect_size == jit_tls->stack_ovf_guard_size;
1962 static G_GNUC_UNUSED void
1963 try_more_restore (void)
1965 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1966 if (try_restore_stack_protection (jit_tls, 500))
1967 jit_tls->restore_stack_prot = NULL;
1970 static G_GNUC_UNUSED void
1971 restore_stack_protection (void)
1973 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1974 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1975 /* if we can't restore the stack protection, keep a callback installed so
1976 * we'll try to restore as much stack as we can at each return from unmanaged
1979 if (try_restore_stack_protection (jit_tls, 4096))
1980 jit_tls->restore_stack_prot = NULL;
1982 jit_tls->restore_stack_prot = try_more_restore_tramp;
1983 /* here we also throw a stack overflow exception */
1984 ex->trace_ips = NULL;
1985 ex->stack_trace = NULL;
1986 mono_raise_exception (ex);
1990 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1992 void (*func)(void) = (gpointer)tramp_data;
1998 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2000 /* we got a stack overflow in the soft-guard pages
2001 * There are two cases:
2002 * 1) managed code caused the overflow: we unprotect the soft-guard page
2003 * and let the arch-specific code trigger the exception handling mechanism
2004 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2005 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2006 * and hope we can continue with those enabled, at least until the hard-guard page
2007 * is hit. The alternative to continuing here is to just print a message and abort.
2008 * We may add in the future the code to protect the pages again in the codepath
2009 * when we return from unmanaged to managed code.
2011 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2012 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2013 /* we unprotect the minimum amount we can */
2015 gboolean handled = FALSE;
2017 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2018 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2019 guard_size -= mono_pagesize ();
2021 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2022 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2023 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);
2024 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2026 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2031 /* We print a message: after this even managed stack overflows
2032 * may crash the runtime
2034 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2035 if (!jit_tls->handling_stack_ovf) {
2036 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2037 jit_tls->handling_stack_ovf = 1;
2039 /*fprintf (stderr, "Already handling stack overflow\n");*/
2048 MonoMethod *omethod;
2050 } PrintOverflowUserData;
2052 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2054 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2056 MonoMethod *method = NULL;
2057 PrintOverflowUserData *user_data = data;
2060 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2061 method = jinfo_get_method (frame->ji);
2064 if (user_data->count == 0) {
2065 /* The first frame is in its prolog, so a line number cannot be computed */
2066 user_data->count ++;
2070 /* If this is a one method overflow, skip the other instances */
2071 if (method == user_data->omethod)
2074 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2075 mono_runtime_printf_err (" %s", location);
2078 if (user_data->count == 1) {
2079 mono_runtime_printf_err (" <...>");
2080 user_data->omethod = method;
2082 user_data->omethod = NULL;
2085 user_data->count ++;
2087 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2094 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2096 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2097 PrintOverflowUserData ud;
2101 /* we don't do much now, but we can warn the user with a useful message */
2102 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2104 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2105 mono_sigctx_to_monoctx (ctx, &mctx);
2107 mono_runtime_printf_err ("Stacktrace:");
2109 memset (&ud, 0, sizeof (ud));
2111 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2113 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2114 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2116 mono_runtime_printf_err ("At <unmanaged>.");
2123 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2125 MonoMethod *method = NULL;
2127 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2128 method = jinfo_get_method (frame->ji);
2131 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2132 mono_runtime_printf_err (" %s", location);
2135 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2140 static G_GNUC_UNUSED gboolean
2141 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2143 GString *p = (GString*)data;
2144 MonoMethod *method = NULL;
2146 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2147 method = jinfo_get_method (frame->ji);
2149 if (method && frame->domain) {
2150 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2151 g_string_append_printf (p, " %s\n", location);
2154 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2159 #ifndef MONO_CROSS_COMPILE
2161 static gboolean handling_sigsegv = FALSE;
2164 * mono_handle_native_sigsegv:
2166 * Handle a SIGSEGV received while in native code by printing diagnostic
2167 * information and aborting.
2170 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2172 #ifdef MONO_ARCH_USE_SIGACTION
2173 struct sigaction sa;
2175 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2176 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2178 if (handling_sigsegv)
2181 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2182 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2193 /* To prevent infinite loops when the stack walk causes a crash */
2194 handling_sigsegv = TRUE;
2196 /* !jit_tls means the thread was not registered with the runtime */
2197 if (jit_tls && mono_thread_internal_current ()) {
2198 mono_runtime_printf_err ("Stacktrace:\n");
2200 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2203 #ifdef HAVE_BACKTRACE_SYMBOLS
2209 mono_runtime_printf_err ("\nNative stacktrace:\n");
2211 size = backtrace (array, 256);
2212 names = backtrace_symbols (array, size);
2213 for (i =0; i < size; ++i) {
2214 mono_runtime_printf_err ("\t%s", names [i]);
2218 /* Try to get more meaningful information using gdb */
2220 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2221 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2222 /* From g_spawn_command_line_sync () in eglib */
2225 pid_t crashed_pid = getpid ();
2229 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2230 * it will deadlock. Call the syscall directly instead.
2232 pid = mono_runtime_syscall_fork ();
2233 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2235 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2236 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2237 // distributions set the scope to 1 which allows attaching only to direct children of
2238 // the current process
2239 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2243 dup2 (STDERR_FILENO, STDOUT_FILENO);
2245 mono_gdb_render_native_backtraces (crashed_pid);
2249 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2250 waitpid (pid, &status, 0);
2254 #elif defined (ENABLE_EXTENSION_MODULE)
2255 mono_extension_handle_native_sigsegv (ctx, info);
2259 * A SIGSEGV indicates something went very wrong so we can no longer depend
2260 * on anything working. So try to print out lots of diagnostics, starting
2261 * with ones which have a greater chance of working.
2263 mono_runtime_printf_err (
2265 "=================================================================\n"
2266 "Got a %s while executing native code. This usually indicates\n"
2267 "a fatal error in the mono runtime or one of the native libraries \n"
2268 "used by your application.\n"
2269 "=================================================================\n",
2273 #ifdef MONO_ARCH_USE_SIGACTION
2275 /* Remove our SIGABRT handler */
2276 sa.sa_handler = SIG_DFL;
2277 sigemptyset (&sa.sa_mask);
2280 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2284 if (!mono_do_crash_chaining) {
2285 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2286 #if defined (PLATFORM_ANDROID)
2297 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2299 g_assert_not_reached ();
2302 #endif /* !MONO_CROSS_COMPILE */
2305 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2307 MonoInternalThread *thread = mono_thread_internal_current ();
2308 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2316 GError *error = NULL;
2321 text = g_string_new (0);
2323 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2325 g_string_append_printf (text, "\n\"%s\"", name);
2328 else if (thread->threadpool_thread)
2329 g_string_append (text, "\n\"<threadpool thread>\"");
2331 g_string_append (text, "\n\"<unnamed thread>\"");
2334 wapi_desc = wapi_current_thread_desc ();
2335 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2339 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2341 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2343 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2345 mono_sigctx_to_monoctx (sigctx, &ctx);
2347 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2349 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2352 mono_runtime_printf ("%s", text->str);
2354 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2355 OutputDebugStringA(text->str);
2358 g_string_free (text, TRUE);
2359 mono_runtime_stdout_fflush ();
2363 * mono_print_thread_dump:
2365 * Print information about the current thread to stdout.
2366 * SIGCTX can be NULL, allowing this to be called from gdb.
2369 mono_print_thread_dump (void *sigctx)
2371 mono_print_thread_dump_internal (sigctx, NULL);
2375 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2377 mono_print_thread_dump_internal (NULL, ctx);
2381 * mono_resume_unwind:
2383 * This is called by a trampoline from LLVM compiled finally clauses to continue
2387 mono_resume_unwind (MonoContext *ctx)
2389 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2390 MonoContext new_ctx;
2392 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2393 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2396 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2398 mono_restore_context (&new_ctx);
2401 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2406 MonoJitExceptionInfo *ei;
2407 } FindHandlerBlockData;
2410 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2414 FindHandlerBlockData *pdata = data;
2415 MonoJitInfo *ji = frame->ji;
2420 ip = MONO_CONTEXT_GET_IP (ctx);
2422 for (i = 0; i < ji->num_clauses; ++i) {
2423 MonoJitExceptionInfo *ei = ji->clauses + i;
2424 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2426 /*If ip points to the first instruction it means the handler block didn't start
2427 so we can leave its execution to the EH machinery*/
2428 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2440 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2443 MonoJitExceptionInfo *clause = NULL;
2446 ip = MONO_CONTEXT_GET_IP (ctx);
2448 for (i = 0; i < ji->num_clauses; ++i) {
2449 clause = &ji->clauses [i];
2450 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2452 if (clause->handler_start < ip && clause->data.handler_end > ip)
2456 /*no matching finally */
2457 if (i == ji->num_clauses)
2460 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2461 if (ip == clause->handler_start)
2464 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2468 * Finds the bottom handler block running and install a block guard if needed.
2469 * FIXME add full-aot support.
2472 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2474 FindHandlerBlockData data = { 0 };
2475 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2482 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2483 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2485 if (!jit_tls || jit_tls->handler_block_return_address)
2488 /* Do an async safe stack walk */
2489 mono_thread_info_set_is_async_context (TRUE);
2490 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2491 mono_thread_info_set_is_async_context (FALSE);
2496 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2498 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2499 if (resume_ip == NULL)
2502 jit_tls->handler_block_return_address = resume_ip;
2503 jit_tls->handler_block = data.ei;
2510 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2518 mono_set_cast_details (MonoClass *from, MonoClass *to)
2520 MonoJitTlsData *jit_tls = NULL;
2522 if (mini_get_debug_options ()->better_cast_details) {
2523 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2524 jit_tls->class_cast_from = from;
2525 jit_tls->class_cast_to = to;
2530 /*returns false if the thread is not attached*/
2532 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2534 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2535 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2543 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2545 #if defined(MONO_CROSS_COMPILE)
2546 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2547 #elif MONO_ARCH_HAS_MONO_CONTEXT
2548 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2550 g_error ("Use a null sigctx requires a working mono-context");
2553 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2554 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2555 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2557 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2563 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2569 mono_thread_state_init (MonoThreadUnwindState *ctx)
2571 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2573 #if defined(MONO_CROSS_COMPILE)
2574 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2575 #elif MONO_ARCH_HAS_MONO_CONTEXT
2576 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2578 g_error ("Use a null sigctx requires a working mono-context");
2581 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2582 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2583 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2589 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2591 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2598 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2599 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2600 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2605 /*returns false if the thread is not attached*/
2607 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2609 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2610 MONO_ARCH_CONTEXT_DEF
2612 mono_arch_flush_register_windows ();
2614 if (!thread || !thread->jit_data) {
2618 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2619 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2621 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2624 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2625 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2626 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2632 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2634 mono_handle_exception (ctx, exc);
2635 mono_restore_context (ctx);
2638 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2640 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2642 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2643 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2644 jit_tls->ex_ctx = *ctx;
2646 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2648 g_error ("This target doesn't support mono_arch_setup_async_callback");
2653 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2655 unhandled_exception_hook = func;
2656 unhandled_exception_hook_data = user_data;
2660 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2662 if (unhandled_exception_hook) {
2663 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2665 MonoObject *other = NULL;
2666 MonoString *str = mono_object_to_string (exc, &other);
2670 msg = mono_string_to_utf8 (str);
2672 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2673 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2675 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2676 original_backtrace, nested_backtrace);
2678 g_free (original_backtrace);
2679 g_free (nested_backtrace);
2681 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2683 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2685 #if defined(HOST_IOS)
2686 g_assertion_message ("Terminating runtime due to unhandled exception");
2688 exit (mono_environment_exitcode_get ());
2692 g_assert_not_reached ();
2696 * mono_restore_context:
2698 * Call the architecture specific restore context function.
2701 mono_restore_context (MonoContext *ctx)
2703 static void (*restore_context) (MonoContext *);
2705 if (!restore_context)
2706 restore_context = mono_get_restore_context ();
2707 restore_context (ctx);
2708 g_assert_not_reached ();
2712 * mono_jinfo_get_unwind_info:
2714 * Return the unwind info for JI.
2717 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2720 return mono_aot_get_unwind_info (ji, unwind_info_len);
2722 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2726 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2728 MonoArchEHJitInfo *info;
2730 info = mono_jit_info_get_arch_eh_info (ji);
2733 return info->epilog_size;