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/metadata/mono-mlist.h>
57 #include <mono/utils/mono-mmap.h>
58 #include <mono/utils/mono-logger-internal.h>
62 #include "debugger-agent.h"
63 #include "seq-points.h"
65 #ifdef ENABLE_EXTENSION_MODULE
66 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
69 #ifndef MONO_ARCH_CONTEXT_DEF
70 #define MONO_ARCH_CONTEXT_DEF
73 static gpointer restore_context_func, call_filter_func;
74 static gpointer throw_exception_func, rethrow_exception_func;
75 static gpointer throw_corlib_exception_func;
77 static gpointer try_more_restore_tramp = NULL;
78 static gpointer restore_stack_protection_tramp = NULL;
80 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
81 static gpointer unhandled_exception_hook_data = NULL;
83 static void try_more_restore (void);
84 static void restore_stack_protection (void);
85 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
86 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
87 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
90 mono_exceptions_init (void)
92 MonoRuntimeExceptionHandlingCallbacks cbs;
94 restore_context_func = mono_aot_get_trampoline ("restore_context");
95 call_filter_func = mono_aot_get_trampoline ("call_filter");
96 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
97 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
101 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
102 mono_tramp_info_register (info, NULL);
103 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
104 mono_tramp_info_register (info, NULL);
105 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
106 mono_tramp_info_register (info, NULL);
107 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
108 mono_tramp_info_register (info, NULL);
110 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
111 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
112 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
115 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
116 mono_arch_exceptions_init ();
118 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
119 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
120 cbs.mono_raise_exception = mono_get_throw_exception ();
121 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
122 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
123 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
124 mono_install_eh_callbacks (&cbs);
128 mono_get_throw_exception (void)
130 g_assert (throw_exception_func);
131 return throw_exception_func;
135 mono_get_rethrow_exception (void)
137 g_assert (rethrow_exception_func);
138 return rethrow_exception_func;
142 mono_get_call_filter (void)
144 g_assert (call_filter_func);
145 return call_filter_func;
149 mono_get_restore_context (void)
151 g_assert (restore_context_func);
152 return restore_context_func;
156 mono_get_throw_corlib_exception (void)
158 gpointer code = NULL;
161 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
162 if (throw_corlib_exception_func)
163 return throw_corlib_exception_func;
166 code = mono_aot_get_trampoline ("throw_corlib_exception");
168 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
169 mono_tramp_info_register (info, NULL);
172 mono_memory_barrier ();
174 throw_corlib_exception_func = code;
176 return throw_corlib_exception_func;
180 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
182 MonoTryBlockHoleTableJitInfo *table;
187 if (ei->try_start > ip || ip >= ei->try_end)
190 if (!ji->has_try_block_holes)
193 table = mono_jit_info_get_try_block_hole_table_info (ji);
194 offset = (guint32)((char*)ip - (char*)ji->code_start);
195 clause = (guint16)(ei - ji->clauses);
196 g_assert (clause < ji->num_clauses);
198 for (i = 0; i < table->num_holes; ++i) {
199 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
200 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
209 * Translate between the mono_arch_unwind_frame function and the old API.
212 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
213 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
215 StackFrameInfo frame;
218 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
220 /* Avoid costly table lookup during stack overflow */
221 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
224 ji = mini_jit_info_table_find (domain, ip, NULL);
229 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
233 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
235 * Remove any unused lmf.
236 * Mask out the lower bits which might be used to hold additional information.
238 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
241 /* Convert between the new and the old APIs */
242 switch (frame.type) {
243 case FRAME_TYPE_MANAGED:
247 case FRAME_TYPE_TRAMPOLINE:
249 case FRAME_TYPE_MANAGED_TO_NATIVE:
253 memset (res, 0, sizeof (MonoJitInfo));
254 res->d.method = frame.method;
257 case FRAME_TYPE_DEBUGGER_INVOKE: {
261 * The normal exception handling code can't handle this frame, so just
264 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
265 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
269 g_assert_not_reached ();
274 /* mono_find_jit_info:
276 * This function is used to gather information from @ctx. It return the
277 * MonoJitInfo of the corresponding function, unwinds one stack frame and
278 * stores the resulting context into @new_ctx. It also stores a string
279 * describing the stack location into @trace (if not NULL), and modifies
280 * the @lmf if necessary. @native_offset return the IP offset from the
281 * start of the function or -1 if that info is not available.
284 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
285 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
289 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
291 MonoMethod *method = NULL;
302 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
304 if (ji == (gpointer)-1)
307 if (ji && !ji->is_trampoline)
308 method = jinfo_get_method (ji);
310 if (managed2 || (method && method->wrapper_type)) {
311 const char *real_ip, *start;
314 start = (const char *)ji->code_start;
316 /* ctx->ip points into native code */
317 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
319 real_ip = (const char*)ip;
321 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
322 offset = real_ip - start;
327 *native_offset = offset;
330 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
334 *trace = mono_debug_print_stack_frame (method, offset, domain);
337 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
338 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
347 * mono_find_jit_info_ext:
349 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
351 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
352 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
353 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
354 * to obtain the last managed frame.
355 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
356 * On return, it will be filled with the locations where callee saved registers are saved
357 * by the current frame. This is returned outside of StackFrameInfo because it can be
358 * quite large on some platforms.
359 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
363 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
364 MonoJitInfo *prev_ji, MonoContext *ctx,
365 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
366 mgreg_t **save_locations,
367 StackFrameInfo *frame)
370 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
372 MonoDomain *target_domain = domain;
373 MonoMethod *method = NULL;
374 gboolean async = mono_thread_info_is_async_context ();
379 /* Avoid costly table lookup during stack overflow */
380 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
383 ji = mini_jit_info_table_find (domain, ip, &target_domain);
386 target_domain = domain;
389 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
391 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
395 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
397 * Remove any unused lmf.
398 * Mask out the lower bits which might be used to hold additional information.
400 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
403 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
404 method = jinfo_get_method (frame->ji);
406 if (frame->type == FRAME_TYPE_MANAGED && method) {
407 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
408 frame->managed = TRUE;
411 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
413 * This type of frame is just a marker, the caller should unwind once more to get the
414 * last managed frame.
417 frame->method = NULL;
420 frame->native_offset = -1;
421 frame->domain = target_domain;
422 frame->async_context = async;
426 if (frame->type == FRAME_TYPE_MANAGED)
427 frame->method = method;
429 if (ji && (frame->managed || (method && method->wrapper_type))) {
430 const char *real_ip, *start;
432 start = (const char *)ji->code_start;
434 /* ctx->ip points into native code */
435 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
437 real_ip = (const char*)ip;
439 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
440 frame->native_offset = real_ip - start;
442 frame->native_offset = -1;
445 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
447 if (trace && frame->method) {
448 char *fname = mono_method_full_name (frame->method, TRUE);
449 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
458 * This function is async-safe.
461 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
463 MonoGenericJitInfo *gi;
467 if (!ji->has_generic_jit_info)
469 gi = mono_jit_info_get_generic_jit_info (ji);
475 * Search location list if available, it contains the precise location of the
476 * argument for every pc offset, even if the method was interrupted while it was in
480 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
483 for (i = 0; i < gi->nlocs; ++i) {
484 MonoDwarfLocListEntry *entry = &gi->locations [i];
486 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
488 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
490 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
494 g_assert (i < gi->nlocs);
497 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
499 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
503 method = jinfo_get_method (ji);
504 if (mono_method_get_context (method)->method_inst) {
506 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
509 /* Avoid returning a managed object */
510 MonoObject *this_obj = info;
512 return this_obj->vtable->klass;
516 static MonoGenericContext
517 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
519 MonoGenericContext context = { NULL, NULL };
520 MonoClass *klass, *method_container_class;
523 g_assert (generic_info);
525 method = jinfo_get_method (ji);
526 g_assert (method->is_inflated);
527 if (mono_method_get_context (method)->method_inst) {
528 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
530 klass = mrgctx->class_vtable->klass;
531 context.method_inst = mrgctx->method_inst;
532 g_assert (context.method_inst);
533 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
534 MonoVTable *vtable = generic_info;
536 klass = vtable->klass;
538 klass = generic_info;
541 //g_assert (!method->klass->generic_container);
542 if (method->klass->generic_class)
543 method_container_class = method->klass->generic_class->container_class;
545 method_container_class = method->klass;
547 /* class might refer to a subclass of method's class */
548 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
549 klass = klass->parent;
553 if (klass->generic_class || klass->generic_container)
554 context.class_inst = mini_class_get_context (klass)->class_inst;
556 if (klass->generic_class)
557 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
559 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
565 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
568 MonoGenericContext context;
571 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
572 return jinfo_get_method (ji);
573 context = get_generic_context_from_stack_frame (ji, generic_info);
575 method = jinfo_get_method (ji);
576 method = mono_method_get_declaring_generic_method (method);
577 method = mono_class_inflate_generic_method_checked (method, &context, &error);
578 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
584 * mono_exception_walk_native_trace:
585 * @ex: The exception object whose frames should be walked
586 * @func: callback to call for each stack frame
587 * @user_data: data passed to the callback
589 * This function walks the stacktrace of an exception. For
590 * each frame the callback function is called with the relevant info.
591 * The walk ends when no more stack frames are found or when the callback
592 * returns a TRUE value.
596 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
598 MonoDomain *domain = mono_domain_get ();
599 MonoArray *ta = ex->trace_ips;
605 len = mono_array_length (ta) >> 1;
606 for (i = 0; i < len; i++) {
607 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
608 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
609 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
612 if (func (NULL, ip, 0, FALSE, user_data))
615 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
616 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
625 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
627 MonoDomain *domain = mono_domain_get ();
629 MonoArray *ta = exc->trace_ips;
630 MonoDebugSourceLocation *location;
634 /* Exception is not thrown yet */
635 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
638 len = mono_array_length (ta) >> 1;
640 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
642 for (i = skip; i < len; i++) {
644 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
645 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
646 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
649 ji = mono_jit_info_table_find (domain, ip);
651 /* Unmanaged frame */
652 mono_array_setref (res, i, sf);
656 g_assert (ji != NULL);
658 method = get_method_from_stack_frame (ji, generic_info);
659 if (jinfo_get_method (ji)->wrapper_type) {
663 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
664 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
668 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
670 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
671 sf->method_address = (gsize) ji->code_start;
672 sf->native_offset = (char *)ip - (char *)ji->code_start;
675 * mono_debug_lookup_source_location() returns both the file / line number information
676 * and the IL offset. Note that computing the IL offset is already an expensive
677 * operation, so we shouldn't call this method twice.
679 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
681 sf->il_offset = location->il_offset;
684 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
685 sf->il_offset = sp.il_offset;
690 if (need_file_info) {
691 if (location && location->source_file) {
692 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
693 sf->line = location->row;
694 sf->column = location->column;
696 sf->line = sf->column = 0;
701 mono_debug_free_source_location (location);
702 mono_array_setref (res, i, sf);
709 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
712 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
713 if (jit_tls && jit_tls->orig_ex_ctx_set)
714 start_ctx = &jit_tls->orig_ex_ctx;
716 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
719 * mono_walk_stack_with_ctx:
721 * Unwind the current thread starting at @start_ctx.
723 * If @start_ctx is null, we capture the current context.
726 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
728 MonoContext extra_ctx;
729 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
730 MONO_ARCH_CONTEXT_DEF
732 if (!thread || !thread->jit_data)
736 mono_arch_flush_register_windows ();
738 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
739 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
741 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
743 start_ctx = &extra_ctx;
746 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
750 * mono_walk_stack_with_state:
752 * Unwind a thread described by @state.
754 * State must be valid (state->valid == TRUE).
756 * If you are using this function to unwind another thread, make sure it is suspended.
758 * If @state is null, we capture the current context.
761 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
763 MonoThreadUnwindState extra_state;
765 g_assert (!mono_thread_info_is_async_context ());
766 if (!mono_thread_state_init_from_current (&extra_state))
768 state = &extra_state;
771 g_assert (state->valid);
773 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
777 mono_walk_stack_full (func,
779 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
780 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
781 state->unwind_data [MONO_UNWIND_DATA_LMF],
782 unwind_options, user_data);
786 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
788 MonoThreadUnwindState state;
789 if (!mono_thread_state_init_from_current (&state))
791 mono_walk_stack_with_state (func, &state, options, user_data);
795 * mono_walk_stack_full:
796 * @func: callback to call for each stack frame
797 * @domain: starting appdomain, can be NULL to use the current domain
798 * @unwind_options: what extra information the unwinder should gather
799 * @start_ctx: starting state of the stack walk, can be NULL.
800 * @thread: the thread whose stack to walk, can be NULL to use the current thread
801 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
802 * @user_data: data passed to the callback
804 * This function walks the stack of a thread, starting from the state
805 * represented by start_ctx. For each frame the callback
806 * function is called with the relevant info. The walk ends when no more
807 * managed stack frames are found or when the callback returns a TRUE value.
810 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
813 MonoContext ctx, new_ctx;
814 StackFrameInfo frame;
816 mgreg_t *reg_locations [MONO_MAX_IREGS];
817 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
818 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
819 gboolean async = mono_thread_info_is_async_context ();
821 g_assert (start_ctx);
824 /*The LMF will be null if the target have no managed frames.*/
825 /* g_assert (lmf); */
828 g_assert (unwind_options == MONO_UNWIND_NONE);
830 memcpy (&ctx, start_ctx, sizeof (MonoContext));
831 memset (reg_locations, 0, sizeof (reg_locations));
833 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
835 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
839 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
840 MonoDebugSourceLocation *source;
842 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
844 il_offset = source->il_offset;
847 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
848 il_offset = sp.il_offset;
852 mono_debug_free_source_location (source);
856 frame.il_offset = il_offset;
858 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
859 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
861 frame.actual_method = frame.method;
864 if (get_reg_locations)
865 frame.reg_locations = reg_locations;
867 if (func (&frame, &ctx, user_data))
870 if (get_reg_locations) {
871 for (i = 0; i < MONO_MAX_IREGS; ++i)
872 if (new_reg_locations [i])
873 reg_locations [i] = new_reg_locations [i];
881 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
882 MonoReflectionMethod **method,
883 gint32 *iloffset, gint32 *native_offset,
884 MonoString **file, gint32 *line, gint32 *column)
886 MonoDomain *domain = mono_domain_get ();
887 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
888 MonoLMF *lmf = mono_get_lmf ();
889 MonoJitInfo *ji = NULL;
890 MonoContext ctx, new_ctx;
891 MonoDebugSourceLocation *location;
892 MonoMethod *jmethod = NULL, *actual_method;
893 StackFrameInfo frame;
896 MONO_ARCH_CONTEXT_DEF;
898 mono_arch_flush_register_windows ();
900 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
901 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
903 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
909 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
913 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
914 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
915 frame.type == FRAME_TYPE_TRAMPOLINE)
919 *native_offset = frame.native_offset;
921 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
922 jmethod = jinfo_get_method (ji);
923 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
928 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
930 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
932 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
934 *iloffset = location->il_offset;
938 if (need_file_info) {
940 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
941 *line = location->row;
942 *column = location->column;
949 mono_debug_free_source_location (location);
955 glist_to_array (GList *list, MonoClass *eclass)
957 MonoDomain *domain = mono_domain_get ();
964 len = g_list_length (list);
965 res = mono_array_new (domain, eclass, len);
967 for (i = 0; list; list = list->next, i++)
968 mono_array_set (res, gpointer, i, list->data);
974 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
976 MonoClass *catch_class = ei->data.catch_class;
977 MonoType *inflated_type;
978 MonoGenericContext context;
980 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
981 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
984 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
986 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
988 /* FIXME: we shouldn't inflate but instead put the
989 type in the rgctx and fetch it from there. It
990 might be a good idea to do this lazily, i.e. only
991 when the exception is actually thrown, so as not to
992 waste space for exception clauses which might never
994 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
995 catch_class = mono_class_from_mono_type (inflated_type);
996 mono_metadata_free_type (inflated_type);
1002 * mini_jit_info_table_find_ext:
1004 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1005 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1006 * OUT_DOMAIN if it is not NULL.
1009 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1012 MonoInternalThread *t = mono_thread_internal_current ();
1018 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1021 *out_domain = domain;
1025 /* maybe it is shared code, so we also search in the root domain */
1026 if (domain != mono_get_root_domain ()) {
1027 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1030 *out_domain = mono_get_root_domain ();
1038 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1039 for (; refs && *refs; refs++) {
1040 if (*refs != domain && *refs != mono_get_root_domain ()) {
1041 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1044 *out_domain = (MonoDomain*) *refs;
1054 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1056 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1060 * wrap_non_exception_throws:
1062 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1063 * WrapNonExceptionThrows flag set.
1066 wrap_non_exception_throws (MonoMethod *m)
1068 MonoAssembly *ass = m->klass->image->assembly;
1069 MonoCustomAttrInfo* attrs;
1070 static MonoClass *klass;
1072 gboolean val = FALSE;
1075 if (ass->wrap_non_exception_throws_inited)
1076 return ass->wrap_non_exception_throws;
1078 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1080 attrs = mono_custom_attrs_from_assembly (ass);
1082 for (i = 0; i < attrs->num_attrs; ++i) {
1083 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1085 int num_named, named_type, name_len;
1088 if (!attr->ctor || attr->ctor->klass != klass)
1090 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1091 p = (const char*)attr->data;
1092 g_assert (read16 (p) == 0x0001);
1094 num_named = read16 (p);
1100 /* data_type = *p; */
1103 if (named_type != 0x54)
1105 name_len = mono_metadata_decode_blob_size (p, &p);
1106 name = g_malloc (name_len + 1);
1107 memcpy (name, p, name_len);
1108 name [name_len] = 0;
1110 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1112 /* The value is a BOOLEAN */
1115 mono_custom_attrs_free (attrs);
1118 ass->wrap_non_exception_throws = val;
1119 mono_memory_barrier ();
1120 ass->wrap_non_exception_throws_inited = TRUE;
1125 #ifndef MONO_ARCH_STACK_GROWS_UP
1126 #define DOES_STACK_GROWS_UP 1
1128 #define DOES_STACK_GROWS_UP 0
1131 #define MAX_UNMANAGED_BACKTRACE 128
1133 build_native_trace (void)
1135 /* This puppy only makes sense on mobile, IOW, ARM. */
1136 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1138 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1139 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1144 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1146 for (i = 0; i < size; i++)
1147 mono_array_set (res, gpointer, i, native_trace [i]);
1155 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1157 if (mono_ex && !initial_trace_ips) {
1158 *trace_ips = g_list_reverse (*trace_ips);
1159 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (*trace_ips, mono_defaults.int_class));
1160 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1161 if (dynamic_methods) {
1162 /* These methods could go away anytime, so save a reference to them in the exception object */
1164 MonoMList *list = NULL;
1166 for (l = dynamic_methods; l; l = l->next) {
1168 MonoDomain *domain = mono_domain_get ();
1170 if (domain->method_to_dyn_method) {
1171 mono_domain_lock (domain);
1172 dis_link = g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1173 mono_domain_unlock (domain);
1175 MonoObject *o = mono_gc_weak_link_get (dis_link);
1177 list = mono_mlist_prepend (list, o);
1183 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1186 g_list_free (*trace_ips);
1191 * mono_handle_exception_internal_first_pass:
1193 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1194 * OBJ is found. Run the index of the filter clause which caught the exception into
1195 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1198 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1200 MonoDomain *domain = mono_domain_get ();
1201 MonoJitInfo *ji = NULL;
1202 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1203 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1204 MonoLMF *lmf = mono_get_lmf ();
1205 MonoArray *initial_trace_ips = NULL;
1206 GList *trace_ips = NULL;
1207 GSList *dynamic_methods = NULL;
1208 MonoException *mono_ex;
1209 gboolean stack_overflow = FALSE;
1210 MonoContext initial_ctx;
1212 int frame_count = 0;
1217 g_assert (ctx != NULL);
1219 if (obj == domain->stack_overflow_ex)
1220 stack_overflow = TRUE;
1222 mono_ex = (MonoException*)obj;
1223 initial_trace_ips = mono_ex->trace_ips;
1225 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1226 mono_ex = (MonoException*)obj;
1227 initial_trace_ips = mono_ex->trace_ips;
1233 call_filter = mono_get_call_filter ();
1235 g_assert (jit_tls->end_of_stack);
1236 g_assert (jit_tls->abort_func);
1239 *out_filter_idx = -1;
1243 *out_prev_ji = NULL;
1248 MonoContext new_ctx;
1250 int clause_index_start = 0;
1251 gboolean unwind_res = TRUE;
1253 StackFrameInfo frame;
1258 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1260 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1261 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1262 frame.type == FRAME_TYPE_TRAMPOLINE) {
1266 g_assert (frame.type == FRAME_TYPE_MANAGED);
1271 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1272 g_slist_free (dynamic_methods);
1277 method = jinfo_get_method (ji);
1278 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1280 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1281 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1282 "The native frame called the managed method:\n%s\n",
1283 mono_method_full_name (method, TRUE));
1286 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1288 * Avoid overwriting the stack trace if the exception is
1289 * rethrown. Also avoid giant stack traces during a stack
1292 if (!initial_trace_ips && (frame_count < 1000)) {
1293 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1294 trace_ips = g_list_prepend (trace_ips,
1295 get_generic_info_from_stack_frame (ji, ctx));
1299 if (method->dynamic)
1300 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1302 if (stack_overflow) {
1303 if (DOES_STACK_GROWS_UP)
1304 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1306 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1308 free_stack = 0xffffff;
1311 for (i = clause_index_start; i < ji->num_clauses; i++) {
1312 MonoJitExceptionInfo *ei = &ji->clauses [i];
1313 gboolean filtered = FALSE;
1316 * During stack overflow, wait till the unwinding frees some stack
1317 * space before running handlers/finalizers.
1319 if (free_stack <= (64 * 1024))
1322 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1324 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1327 * Have to unwrap RuntimeWrappedExceptions if the
1328 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1330 if (non_exception && !wrap_non_exception_throws (method))
1331 ex_obj = non_exception;
1335 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1336 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1337 #ifndef DISABLE_PERFCOUNTERS
1338 mono_perfcounters->exceptions_filters++;
1341 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1342 trim the stackframe since if it returns FALSE we lose information.
1344 FIXME Not 100% sure if it's a good idea even with user clauses.
1347 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1349 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1351 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1353 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1354 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1356 g_assert (!ji->from_llvm);
1357 /* store the exception object in bp + ei->exvar_offset */
1358 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1361 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1363 * Pass the original il clause index to the landing pad so it can
1364 * branch to the landing pad associated with the il clause.
1365 * This is needed because llvm compiled code assumes that the EH
1366 * code always branches to the innermost landing pad.
1369 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1372 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1373 filtered = call_filter (ctx, ei->data.filter);
1374 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1375 if (filtered && out_filter_idx)
1376 *out_filter_idx = filter_idx;
1383 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1384 g_slist_free (dynamic_methods);
1385 /* mono_debugger_agent_handle_exception () needs this */
1386 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1391 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1392 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1393 g_slist_free (dynamic_methods);
1398 /* mono_debugger_agent_handle_exception () needs this */
1399 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1408 g_assert_not_reached ();
1412 * mono_handle_exception_internal:
1413 * @ctx: saved processor state
1414 * @obj: the exception object
1415 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1418 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1420 MonoDomain *domain = mono_domain_get ();
1421 MonoJitInfo *ji, *prev_ji;
1422 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1423 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1424 MonoLMF *lmf = mono_get_lmf ();
1425 MonoException *mono_ex;
1426 gboolean stack_overflow = FALSE;
1427 MonoContext initial_ctx;
1429 int frame_count = 0;
1430 gint32 filter_idx, first_filter_idx = 0;
1433 MonoObject *non_exception = NULL;
1435 g_assert (ctx != NULL);
1437 MonoException *ex = mono_get_exception_null_reference ();
1438 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1439 obj = (MonoObject *)ex;
1443 * Allocate a new exception object instead of the preconstructed ones.
1445 if (obj == domain->stack_overflow_ex) {
1447 * It is not a good idea to try and put even more pressure on the little stack available.
1448 * obj = mono_get_exception_stack_overflow ();
1450 stack_overflow = TRUE;
1452 else if (obj == domain->null_reference_ex) {
1453 obj = mono_get_exception_null_reference ();
1456 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1457 non_exception = obj;
1458 obj = mono_get_exception_runtime_wrapped (obj);
1461 mono_ex = (MonoException*)obj;
1463 if (mini_get_debug_options ()->suspend_on_exception) {
1464 mono_runtime_printf_err ("Exception thrown, suspending...");
1469 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1470 mono_ex = (MonoException*)obj;
1475 if (mono_ex && jit_tls->class_cast_from) {
1476 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1477 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1478 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1479 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1480 mono_ex->message = mono_string_new (domain, msg);
1485 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1486 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1487 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1488 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1489 mono_ex->message = mono_string_new (domain, msg);
1497 call_filter = mono_get_call_filter ();
1499 g_assert (jit_tls->end_of_stack);
1500 g_assert (jit_tls->abort_func);
1503 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1504 * end up being TRUE on any code path.
1506 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1511 MonoContext ctx_cp = *ctx;
1512 if (mono_trace_is_enabled ()) {
1513 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1514 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1515 MonoObject *message;
1516 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1518 MonoObject *exc = NULL;
1519 if (get_message == NULL) {
1521 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1523 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1525 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1529 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1531 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1533 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1534 mono_print_thread_dump_from_ctx (ctx);
1536 jit_tls->orig_ex_ctx_set = TRUE;
1537 mono_profiler_exception_thrown (obj);
1538 jit_tls->orig_ex_ctx_set = FALSE;
1540 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1543 if (mini_get_debug_options ()->break_on_exc)
1545 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1547 if (mini_get_debug_options ()->suspend_on_unhandled) {
1548 mono_runtime_printf_err ("Unhandled exception, suspending...");
1553 // FIXME: This runs managed code so it might cause another stack overflow when
1554 // we are handling a stack overflow
1555 mono_unhandled_exception (obj);
1557 gboolean unhandled = FALSE;
1560 * The exceptions caught by the mono_runtime_invoke () calls
1561 * in the threadpool needs to be treated as unhandled (#669836).
1563 * FIXME: The check below is hackish, but its hard to distinguish
1564 * these runtime invoke calls from others in the runtime.
1566 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1567 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1572 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1574 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1584 MonoContext new_ctx;
1586 int clause_index_start = 0;
1587 gboolean unwind_res = TRUE;
1591 ji = jit_tls->resume_state.ji;
1592 new_ctx = jit_tls->resume_state.new_ctx;
1593 clause_index_start = jit_tls->resume_state.clause_index;
1594 lmf = jit_tls->resume_state.lmf;
1595 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1596 filter_idx = jit_tls->resume_state.filter_idx;
1598 StackFrameInfo frame;
1600 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1602 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1603 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1604 frame.type == FRAME_TYPE_TRAMPOLINE) {
1608 g_assert (frame.type == FRAME_TYPE_MANAGED);
1614 *(mono_get_lmf_addr ()) = lmf;
1616 jit_tls->abort_func (obj);
1617 g_assert_not_reached ();
1620 method = jinfo_get_method (ji);
1622 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1624 if (stack_overflow) {
1625 if (DOES_STACK_GROWS_UP)
1626 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1628 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1630 free_stack = 0xffffff;
1633 for (i = clause_index_start; i < ji->num_clauses; i++) {
1634 MonoJitExceptionInfo *ei = &ji->clauses [i];
1635 gboolean filtered = FALSE;
1638 * During stack overflow, wait till the unwinding frees some stack
1639 * space before running handlers/finalizers.
1641 if (free_stack <= (64 * 1024))
1644 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1646 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1649 * Have to unwrap RuntimeWrappedExceptions if the
1650 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1652 if (non_exception && !wrap_non_exception_throws (method))
1653 ex_obj = non_exception;
1657 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1658 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1659 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1661 g_assert (!ji->from_llvm);
1662 /* store the exception object in bp + ei->exvar_offset */
1663 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1667 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1669 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1672 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1674 * Filter clauses should only be run in the
1675 * first pass of exception handling.
1677 filtered = (filter_idx == first_filter_idx);
1681 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1682 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1684 * This guards against the situation that we abort a thread that is executing a finally clause
1685 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1686 * check for this situation here and resume interruption if we are below the guarded block.
1688 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1689 gboolean is_outside = FALSE;
1690 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1691 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1692 //FIXME make this stack direction aware
1693 if (catch_bp > prot_bp) {
1695 } else if (catch_bp == prot_bp) {
1696 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1697 * So we check if the catch handler_start is protected by the guarded handler protected region
1700 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1701 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1702 * There aren't any further finally/fault handler blocks down the stack over this exception.
1703 * This must be ensured by the code that installs the guard trampoline.
1705 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1707 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1712 jit_tls->handler_block_return_address = NULL;
1713 jit_tls->handler_block = NULL;
1714 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1718 if (mono_trace_is_enabled () && mono_trace_eval (method))
1719 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1720 jit_tls->orig_ex_ctx_set = TRUE;
1721 mono_profiler_exception_clause_handler (method, ei->flags, i);
1722 jit_tls->orig_ex_ctx_set = FALSE;
1723 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1725 #ifndef DISABLE_PERFCOUNTERS
1726 mono_perfcounters->exceptions_depth += frame_count;
1728 if (obj == domain->stack_overflow_ex)
1729 jit_tls->handling_stack_ovf = FALSE;
1733 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1734 if (mono_trace_is_enabled () && mono_trace_eval (method))
1735 g_print ("EXCEPTION: fault 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 call_filter (ctx, ei->handler_start);
1741 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1742 if (mono_trace_is_enabled () && mono_trace_eval (method))
1743 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1744 jit_tls->orig_ex_ctx_set = TRUE;
1745 mono_profiler_exception_clause_handler (method, ei->flags, i);
1746 jit_tls->orig_ex_ctx_set = FALSE;
1747 #ifndef DISABLE_PERFCOUNTERS
1748 mono_perfcounters->exceptions_finallys++;
1751 if (ji->from_llvm) {
1753 * LLVM compiled finally handlers follow the design
1754 * of the c++ ehabi, i.e. they call a resume function
1755 * at the end instead of returning to the caller.
1756 * So save the exception handling state,
1757 * mono_resume_unwind () will call us again to continue
1760 jit_tls->resume_state.ex_obj = obj;
1761 jit_tls->resume_state.ji = ji;
1762 jit_tls->resume_state.clause_index = i + 1;
1763 jit_tls->resume_state.ctx = *ctx;
1764 jit_tls->resume_state.new_ctx = new_ctx;
1765 jit_tls->resume_state.lmf = lmf;
1766 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1767 jit_tls->resume_state.filter_idx = filter_idx;
1768 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1771 call_filter (ctx, ei->handler_start);
1777 jit_tls->orig_ex_ctx_set = TRUE;
1778 mono_profiler_exception_method_leave (method);
1779 jit_tls->orig_ex_ctx_set = FALSE;
1784 g_assert_not_reached ();
1788 * mono_debugger_run_finally:
1789 * @start_ctx: saved processor state
1791 * This method is called by the Mono Debugger to call all `finally' clauses of the
1792 * current stack frame. It's used when the user issues a `return' command to make
1793 * the current stack frame return. After returning from this method, the debugger
1794 * unwinds the stack one frame and gives control back to the user.
1796 * NOTE: This method is only used when running inside the Mono Debugger.
1799 mono_debugger_run_finally (MonoContext *start_ctx)
1801 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1802 MonoDomain *domain = mono_domain_get ();
1803 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1804 MonoLMF *lmf = mono_get_lmf ();
1805 MonoContext ctx, new_ctx;
1806 MonoJitInfo *ji, rji;
1811 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1812 if (!ji || ji == (gpointer)-1)
1816 call_filter = mono_get_call_filter ();
1818 for (i = 0; i < ji->num_clauses; i++) {
1819 MonoJitExceptionInfo *ei = &ji->clauses [i];
1821 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1822 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1823 call_filter (&ctx, ei->handler_start);
1829 * mono_handle_exception:
1830 * @ctx: saved processor state
1831 * @obj: the exception object
1834 mono_handle_exception (MonoContext *ctx, gpointer obj)
1836 #ifndef DISABLE_PERFCOUNTERS
1837 mono_perfcounters->exceptions_thrown++;
1840 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1843 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1845 #ifndef MONO_ARCH_USE_SIGACTION
1846 #error "Can't use sigaltstack without sigaction"
1849 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1852 mono_setup_altstack (MonoJitTlsData *tls)
1856 guint8 *staddr = NULL;
1858 if (mono_running_on_valgrind ())
1861 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1865 tls->end_of_stack = staddr + stsize;
1866 tls->stack_size = stsize;
1868 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1870 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1871 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1873 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1875 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1876 /* mprotect can fail for the main thread stack */
1877 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);
1878 g_assert (gaddr == tls->stack_ovf_guard_base);
1879 tls->stack_ovf_valloced = TRUE;
1882 /* Setup an alternate signal stack */
1883 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1884 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1886 g_assert (tls->signal_stack);
1888 sa.ss_sp = tls->signal_stack;
1889 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1891 g_assert (sigaltstack (&sa, NULL) == 0);
1893 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);
1897 mono_free_altstack (MonoJitTlsData *tls)
1902 sa.ss_sp = tls->signal_stack;
1903 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1904 sa.ss_flags = SS_DISABLE;
1905 err = sigaltstack (&sa, NULL);
1906 g_assert (err == 0);
1908 if (tls->signal_stack)
1909 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1910 if (tls->stack_ovf_valloced)
1911 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1913 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1916 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1919 mono_setup_altstack (MonoJitTlsData *tls)
1924 mono_free_altstack (MonoJitTlsData *tls)
1928 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1931 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1933 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1934 /* we need to leave some room for throwing the exception */
1935 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1936 unprotect_size -= mono_pagesize ();
1937 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1938 * is sufficient stack
1940 //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);
1942 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1943 return unprotect_size == jit_tls->stack_ovf_guard_size;
1946 static G_GNUC_UNUSED void
1947 try_more_restore (void)
1949 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1950 if (try_restore_stack_protection (jit_tls, 500))
1951 jit_tls->restore_stack_prot = NULL;
1954 static G_GNUC_UNUSED void
1955 restore_stack_protection (void)
1957 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1958 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1959 /* if we can't restore the stack protection, keep a callback installed so
1960 * we'll try to restore as much stack as we can at each return from unmanaged
1963 if (try_restore_stack_protection (jit_tls, 4096))
1964 jit_tls->restore_stack_prot = NULL;
1966 jit_tls->restore_stack_prot = try_more_restore_tramp;
1967 /* here we also throw a stack overflow exception */
1968 ex->trace_ips = NULL;
1969 ex->stack_trace = NULL;
1970 mono_raise_exception (ex);
1974 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1976 void (*func)(void) = (gpointer)tramp_data;
1982 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1984 /* we got a stack overflow in the soft-guard pages
1985 * There are two cases:
1986 * 1) managed code caused the overflow: we unprotect the soft-guard page
1987 * and let the arch-specific code trigger the exception handling mechanism
1988 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1989 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1990 * and hope we can continue with those enabled, at least until the hard-guard page
1991 * is hit. The alternative to continuing here is to just print a message and abort.
1992 * We may add in the future the code to protect the pages again in the codepath
1993 * when we return from unmanaged to managed code.
1995 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1996 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1997 /* we unprotect the minimum amount we can */
1999 gboolean handled = FALSE;
2001 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2002 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2003 guard_size -= mono_pagesize ();
2005 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2006 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2007 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);
2008 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2010 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2015 /* We print a message: after this even managed stack overflows
2016 * may crash the runtime
2018 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2019 if (!jit_tls->handling_stack_ovf) {
2020 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2021 jit_tls->handling_stack_ovf = 1;
2023 /*fprintf (stderr, "Already handling stack overflow\n");*/
2032 MonoMethod *omethod;
2034 } PrintOverflowUserData;
2036 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2038 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2040 MonoMethod *method = NULL;
2041 PrintOverflowUserData *user_data = data;
2044 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2045 method = jinfo_get_method (frame->ji);
2048 if (user_data->count == 0) {
2049 /* The first frame is in its prolog, so a line number cannot be computed */
2050 user_data->count ++;
2054 /* If this is a one method overflow, skip the other instances */
2055 if (method == user_data->omethod)
2058 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2059 mono_runtime_printf_err (" %s", location);
2062 if (user_data->count == 1) {
2063 mono_runtime_printf_err (" <...>");
2064 user_data->omethod = method;
2066 user_data->omethod = NULL;
2069 user_data->count ++;
2071 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2078 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2080 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2081 PrintOverflowUserData ud;
2085 /* we don't do much now, but we can warn the user with a useful message */
2086 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2088 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2089 mono_sigctx_to_monoctx (ctx, &mctx);
2091 mono_runtime_printf_err ("Stacktrace:");
2093 memset (&ud, 0, sizeof (ud));
2095 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2097 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2098 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2100 mono_runtime_printf_err ("At <unmanaged>.");
2107 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2109 MonoMethod *method = NULL;
2111 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2112 method = jinfo_get_method (frame->ji);
2115 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2116 mono_runtime_printf_err (" %s", location);
2119 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2124 static G_GNUC_UNUSED gboolean
2125 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2127 GString *p = (GString*)data;
2128 MonoMethod *method = NULL;
2130 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2131 method = jinfo_get_method (frame->ji);
2133 if (method && frame->domain) {
2134 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2135 g_string_append_printf (p, " %s\n", location);
2138 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2143 #ifndef MONO_CROSS_COMPILE
2145 static gboolean handling_sigsegv = FALSE;
2148 * mono_handle_native_sigsegv:
2150 * Handle a SIGSEGV received while in native code by printing diagnostic
2151 * information and aborting.
2154 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2156 #ifdef MONO_ARCH_USE_SIGACTION
2157 struct sigaction sa;
2159 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2160 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2162 if (handling_sigsegv)
2165 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2166 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2177 /* To prevent infinite loops when the stack walk causes a crash */
2178 handling_sigsegv = TRUE;
2180 /* !jit_tls means the thread was not registered with the runtime */
2181 if (jit_tls && mono_thread_internal_current ()) {
2182 mono_runtime_printf_err ("Stacktrace:\n");
2184 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2187 #ifdef HAVE_BACKTRACE_SYMBOLS
2193 mono_runtime_printf_err ("\nNative stacktrace:\n");
2195 size = backtrace (array, 256);
2196 names = backtrace_symbols (array, size);
2197 for (i =0; i < size; ++i) {
2198 mono_runtime_printf_err ("\t%s", names [i]);
2202 /* Try to get more meaningful information using gdb */
2204 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2205 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2206 /* From g_spawn_command_line_sync () in eglib */
2209 pid_t crashed_pid = getpid ();
2213 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2214 * it will deadlock. Call the syscall directly instead.
2216 pid = mono_runtime_syscall_fork ();
2217 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2219 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2220 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2221 // distributions set the scope to 1 which allows attaching only to direct children of
2222 // the current process
2223 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2227 dup2 (STDERR_FILENO, STDOUT_FILENO);
2229 mono_gdb_render_native_backtraces (crashed_pid);
2233 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2234 waitpid (pid, &status, 0);
2238 #elif defined (ENABLE_EXTENSION_MODULE)
2239 mono_extension_handle_native_sigsegv (ctx, info);
2243 * A SIGSEGV indicates something went very wrong so we can no longer depend
2244 * on anything working. So try to print out lots of diagnostics, starting
2245 * with ones which have a greater chance of working.
2247 mono_runtime_printf_err (
2249 "=================================================================\n"
2250 "Got a %s while executing native code. This usually indicates\n"
2251 "a fatal error in the mono runtime or one of the native libraries \n"
2252 "used by your application.\n"
2253 "=================================================================\n",
2257 #ifdef MONO_ARCH_USE_SIGACTION
2259 /* Remove our SIGABRT handler */
2260 sa.sa_handler = SIG_DFL;
2261 sigemptyset (&sa.sa_mask);
2264 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2268 if (!mono_do_crash_chaining) {
2269 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2270 #if defined (PLATFORM_ANDROID)
2281 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2283 g_assert_not_reached ();
2286 #endif /* !MONO_CROSS_COMPILE */
2289 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2291 MonoInternalThread *thread = mono_thread_internal_current ();
2292 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2300 GError *error = NULL;
2305 text = g_string_new (0);
2307 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2309 g_string_append_printf (text, "\n\"%s\"", name);
2312 else if (thread->threadpool_thread)
2313 g_string_append (text, "\n\"<threadpool thread>\"");
2315 g_string_append (text, "\n\"<unnamed thread>\"");
2318 wapi_desc = wapi_current_thread_desc ();
2319 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2323 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2325 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2327 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2329 mono_sigctx_to_monoctx (sigctx, &ctx);
2331 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2333 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2336 mono_runtime_printf ("%s", text->str);
2338 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2339 OutputDebugStringA(text->str);
2342 g_string_free (text, TRUE);
2343 mono_runtime_stdout_fflush ();
2347 * mono_print_thread_dump:
2349 * Print information about the current thread to stdout.
2350 * SIGCTX can be NULL, allowing this to be called from gdb.
2353 mono_print_thread_dump (void *sigctx)
2355 mono_print_thread_dump_internal (sigctx, NULL);
2359 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2361 mono_print_thread_dump_internal (NULL, ctx);
2365 * mono_resume_unwind:
2367 * This is called by a trampoline from LLVM compiled finally clauses to continue
2371 mono_resume_unwind (MonoContext *ctx)
2373 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2374 MonoContext new_ctx;
2376 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2377 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2380 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2382 mono_restore_context (&new_ctx);
2385 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2390 MonoJitExceptionInfo *ei;
2391 } FindHandlerBlockData;
2394 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2398 FindHandlerBlockData *pdata = data;
2399 MonoJitInfo *ji = frame->ji;
2404 ip = MONO_CONTEXT_GET_IP (ctx);
2406 for (i = 0; i < ji->num_clauses; ++i) {
2407 MonoJitExceptionInfo *ei = ji->clauses + i;
2408 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2410 /*If ip points to the first instruction it means the handler block didn't start
2411 so we can leave its execution to the EH machinery*/
2412 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2424 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2427 MonoJitExceptionInfo *clause = NULL;
2430 ip = MONO_CONTEXT_GET_IP (ctx);
2432 for (i = 0; i < ji->num_clauses; ++i) {
2433 clause = &ji->clauses [i];
2434 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2436 if (clause->handler_start < ip && clause->data.handler_end > ip)
2440 /*no matching finally */
2441 if (i == ji->num_clauses)
2444 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2445 if (ip == clause->handler_start)
2448 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2452 * Finds the bottom handler block running and install a block guard if needed.
2453 * FIXME add full-aot support.
2456 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2458 FindHandlerBlockData data = { 0 };
2459 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2466 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2467 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2469 if (!jit_tls || jit_tls->handler_block_return_address)
2472 /* Do an async safe stack walk */
2473 mono_thread_info_set_is_async_context (TRUE);
2474 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2475 mono_thread_info_set_is_async_context (FALSE);
2480 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2482 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2483 if (resume_ip == NULL)
2486 jit_tls->handler_block_return_address = resume_ip;
2487 jit_tls->handler_block = data.ei;
2494 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2502 mono_set_cast_details (MonoClass *from, MonoClass *to)
2504 MonoJitTlsData *jit_tls = NULL;
2506 if (mini_get_debug_options ()->better_cast_details) {
2507 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2508 jit_tls->class_cast_from = from;
2509 jit_tls->class_cast_to = to;
2514 /*returns false if the thread is not attached*/
2516 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2518 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2519 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2527 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2529 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2530 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2531 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2534 mono_thread_state_init (ctx);
2537 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2543 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2549 mono_thread_state_init (MonoThreadUnwindState *ctx)
2551 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2553 #if defined(MONO_CROSS_COMPILE)
2554 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2555 #elif MONO_ARCH_HAS_MONO_CONTEXT
2556 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2558 g_error ("Use a null sigctx requires a working mono-context");
2561 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2562 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2563 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2569 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2571 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2578 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2579 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2580 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2585 /*returns false if the thread is not attached*/
2587 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2589 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2590 MONO_ARCH_CONTEXT_DEF
2592 mono_arch_flush_register_windows ();
2594 if (!thread || !thread->jit_data) {
2598 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2599 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2601 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2604 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2605 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2606 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2612 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2614 mono_handle_exception (ctx, exc);
2615 mono_restore_context (ctx);
2618 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2620 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2622 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2623 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2624 jit_tls->ex_ctx = *ctx;
2626 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2628 g_error ("This target doesn't support mono_arch_setup_async_callback");
2633 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2635 unhandled_exception_hook = func;
2636 unhandled_exception_hook_data = user_data;
2640 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2642 if (unhandled_exception_hook) {
2643 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2645 MonoObject *other = NULL;
2646 MonoString *str = mono_object_to_string (exc, &other);
2650 msg = mono_string_to_utf8 (str);
2652 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2653 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2655 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2656 original_backtrace, nested_backtrace);
2658 g_free (original_backtrace);
2659 g_free (nested_backtrace);
2661 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2663 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2665 #if defined(HOST_IOS)
2666 g_assertion_message ("Terminating runtime due to unhandled exception");
2668 exit (mono_environment_exitcode_get ());
2672 g_assert_not_reached ();
2676 * mono_restore_context:
2678 * Call the architecture specific restore context function.
2681 mono_restore_context (MonoContext *ctx)
2683 static void (*restore_context) (MonoContext *);
2685 if (!restore_context)
2686 restore_context = mono_get_restore_context ();
2687 restore_context (ctx);
2688 g_assert_not_reached ();
2692 * mono_jinfo_get_unwind_info:
2694 * Return the unwind info for JI.
2697 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2700 return mono_aot_get_unwind_info (ji, unwind_info_len);
2702 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2706 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2708 MonoArchEHJitInfo *info;
2710 info = mono_jit_info_get_arch_eh_info (ji);
2713 return info->epilog_size;