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 #include <mono/metadata/appdomain.h>
42 #include <mono/metadata/tabledefs.h>
43 #include <mono/metadata/threads.h>
44 #include <mono/metadata/threads-types.h>
45 #include <mono/metadata/debug-helpers.h>
46 #include <mono/metadata/exception.h>
47 #include <mono/metadata/gc-internal.h>
48 #include <mono/metadata/mono-debug.h>
49 #include <mono/metadata/profiler.h>
50 #include <mono/metadata/mono-endian.h>
51 #include <mono/metadata/environment.h>
52 #include <mono/utils/mono-mmap.h>
53 #include <mono/utils/mono-logger-internal.h>
57 #include "debugger-agent.h"
58 #include "seq-points.h"
60 #ifdef ENABLE_EXTENSION_MODULE
61 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
64 #ifndef MONO_ARCH_CONTEXT_DEF
65 #define MONO_ARCH_CONTEXT_DEF
68 static gpointer restore_context_func, call_filter_func;
69 static gpointer throw_exception_func, rethrow_exception_func;
70 static gpointer throw_corlib_exception_func;
72 static gpointer try_more_restore_tramp = NULL;
73 static gpointer restore_stack_protection_tramp = NULL;
75 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
76 static gpointer unhandled_exception_hook_data = NULL;
78 static void try_more_restore (void);
79 static void restore_stack_protection (void);
80 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
81 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
82 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
85 mono_exceptions_init (void)
87 MonoRuntimeExceptionHandlingCallbacks cbs;
89 restore_context_func = mono_aot_get_trampoline ("restore_context");
90 call_filter_func = mono_aot_get_trampoline ("call_filter");
91 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
92 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
96 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
97 mono_tramp_info_register (info);
98 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
99 mono_tramp_info_register (info);
100 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
101 mono_tramp_info_register (info);
102 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
103 mono_tramp_info_register (info);
105 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
106 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
107 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
110 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
111 mono_arch_exceptions_init ();
113 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
114 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
115 cbs.mono_raise_exception = mono_get_throw_exception ();
116 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
117 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
118 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
119 mono_install_eh_callbacks (&cbs);
123 mono_get_throw_exception (void)
125 g_assert (throw_exception_func);
126 return throw_exception_func;
130 mono_get_rethrow_exception (void)
132 g_assert (rethrow_exception_func);
133 return rethrow_exception_func;
137 mono_get_call_filter (void)
139 g_assert (call_filter_func);
140 return call_filter_func;
144 mono_get_restore_context (void)
146 g_assert (restore_context_func);
147 return restore_context_func;
151 mono_get_throw_corlib_exception (void)
153 gpointer code = NULL;
156 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
157 if (throw_corlib_exception_func)
158 return throw_corlib_exception_func;
161 code = mono_aot_get_trampoline ("throw_corlib_exception");
163 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
164 mono_tramp_info_register (info);
167 mono_memory_barrier ();
169 throw_corlib_exception_func = code;
171 return throw_corlib_exception_func;
175 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
177 MonoTryBlockHoleTableJitInfo *table;
182 if (ei->try_start > ip || ip >= ei->try_end)
185 if (!ji->has_try_block_holes)
188 table = mono_jit_info_get_try_block_hole_table_info (ji);
189 offset = (guint32)((char*)ip - (char*)ji->code_start);
190 clause = (guint16)(ei - ji->clauses);
191 g_assert (clause < ji->num_clauses);
193 for (i = 0; i < table->num_holes; ++i) {
194 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
195 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
204 * Translate between the mono_arch_find_jit_info function and the old API.
207 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
208 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
210 StackFrameInfo frame;
213 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
215 /* Avoid costly table lookup during stack overflow */
216 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
219 ji = mini_jit_info_table_find (domain, ip, NULL);
224 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
228 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
230 * Remove any unused lmf.
231 * Mask out the lower bits which might be used to hold additional information.
233 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
236 /* Convert between the new and the old APIs */
237 switch (frame.type) {
238 case FRAME_TYPE_MANAGED:
242 case FRAME_TYPE_MANAGED_TO_NATIVE:
246 memset (res, 0, sizeof (MonoJitInfo));
247 res->d.method = frame.method;
250 case FRAME_TYPE_DEBUGGER_INVOKE: {
254 * The normal exception handling code can't handle this frame, so just
257 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
258 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
262 g_assert_not_reached ();
267 /* mono_find_jit_info:
269 * This function is used to gather information from @ctx. It return the
270 * MonoJitInfo of the corresponding function, unwinds one stack frame and
271 * stores the resulting context into @new_ctx. It also stores a string
272 * describing the stack location into @trace (if not NULL), and modifies
273 * the @lmf if necessary. @native_offset return the IP offset from the
274 * start of the function or -1 if that info is not available.
277 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
278 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
282 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
284 MonoMethod *method = NULL;
295 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
297 if (ji == (gpointer)-1)
301 method = jinfo_get_method (ji);
303 if (managed2 || (ji && method->wrapper_type)) {
304 const char *real_ip, *start;
307 start = (const char *)ji->code_start;
309 /* ctx->ip points into native code */
310 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
312 real_ip = (const char*)ip;
314 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
315 offset = real_ip - start;
320 *native_offset = offset;
323 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
327 *trace = mono_debug_print_stack_frame (method, offset, domain);
330 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
331 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
340 * mono_find_jit_info_ext:
342 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
344 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
345 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
346 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
347 * to obtain the last managed frame.
348 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
349 * On return, it will be filled with the locations where callee saved registers are saved
350 * by the current frame. This is returned outside of StackFrameInfo because it can be
351 * quite large on some platforms.
352 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
356 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
357 MonoJitInfo *prev_ji, MonoContext *ctx,
358 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
359 mgreg_t **save_locations,
360 StackFrameInfo *frame)
363 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
365 MonoDomain *target_domain = domain;
366 MonoMethod *method = NULL;
367 gboolean async = mono_thread_info_is_async_context ();
372 /* Avoid costly table lookup during stack overflow */
373 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
376 ji = mini_jit_info_table_find (domain, ip, &target_domain);
379 target_domain = domain;
382 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
384 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
388 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
390 * Remove any unused lmf.
391 * Mask out the lower bits which might be used to hold additional information.
393 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
396 if (frame->ji && !frame->ji->async)
397 method = jinfo_get_method (frame->ji);
399 if (frame->type == FRAME_TYPE_MANAGED && method) {
400 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
401 frame->managed = TRUE;
404 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
406 * This type of frame is just a marker, the caller should unwind once more to get the
407 * last managed frame.
410 frame->method = NULL;
413 frame->native_offset = -1;
414 frame->domain = target_domain;
415 frame->async_context = async;
419 if (frame->type == FRAME_TYPE_MANAGED)
420 frame->method = method;
422 if (ji && (frame->managed || (method && method->wrapper_type))) {
423 const char *real_ip, *start;
425 start = (const char *)ji->code_start;
427 /* ctx->ip points into native code */
428 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
430 real_ip = (const char*)ip;
432 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
433 frame->native_offset = real_ip - start;
435 frame->native_offset = -1;
438 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
440 if (trace && frame->method) {
441 char *fname = mono_method_full_name (frame->method, TRUE);
442 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
451 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
453 MonoGenericJitInfo *gi;
457 if (!ji->has_generic_jit_info)
459 gi = mono_jit_info_get_generic_jit_info (ji);
465 * Search location list if available, it contains the precise location of the
466 * argument for every pc offset, even if the method was interrupted while it was in
470 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
473 for (i = 0; i < gi->nlocs; ++i) {
474 MonoDwarfLocListEntry *entry = &gi->locations [i];
476 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
478 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
480 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
484 g_assert (i < gi->nlocs);
487 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
489 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
493 method = jinfo_get_method (ji);
494 if (mono_method_get_context (method)->method_inst) {
496 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
499 /* Avoid returning a managed object */
500 MonoObject *this_obj = info;
502 return this_obj->vtable->klass;
506 static MonoGenericContext
507 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
509 MonoGenericContext context = { NULL, NULL };
510 MonoClass *class, *method_container_class;
513 g_assert (generic_info);
515 method = jinfo_get_method (ji);
516 g_assert (method->is_inflated);
517 if (mono_method_get_context (method)->method_inst) {
518 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
520 class = mrgctx->class_vtable->klass;
521 context.method_inst = mrgctx->method_inst;
522 g_assert (context.method_inst);
523 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
524 MonoVTable *vtable = generic_info;
526 class = vtable->klass;
528 class = generic_info;
531 //g_assert (!method->klass->generic_container);
532 if (method->klass->generic_class)
533 method_container_class = method->klass->generic_class->container_class;
535 method_container_class = method->klass;
537 /* class might refer to a subclass of method's class */
538 while (!(class == method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
539 class = class->parent;
543 if (class->generic_class || class->generic_container)
544 context.class_inst = mini_class_get_context (class)->class_inst;
546 if (class->generic_class)
547 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
549 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
555 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
558 MonoGenericContext context;
561 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
562 return jinfo_get_method (ji);
563 context = get_generic_context_from_stack_frame (ji, generic_info);
565 method = jinfo_get_method (ji);
566 method = mono_method_get_declaring_generic_method (method);
567 method = mono_class_inflate_generic_method_checked (method, &context, &error);
568 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
574 * mono_exception_walk_native_trace:
575 * @ex: The exception object whose frames should be walked
576 * @func: callback to call for each stack frame
577 * @user_data: data passed to the callback
579 * This function walks the stacktrace of an exception. For
580 * each frame the callback function is called with the relevant info.
581 * The walk ends when no more stack frames are found or when the callback
582 * returns a TRUE value.
586 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
588 MonoDomain *domain = mono_domain_get ();
589 MonoArray *ta = ex->trace_ips;
595 len = mono_array_length (ta) >> 1;
596 for (i = 0; i < len; i++) {
597 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
598 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
599 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
602 if (func (NULL, ip, 0, FALSE, user_data))
605 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
606 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
615 ves_icall_System_Exception_get_trace (MonoException *ex)
617 MonoDomain *domain = mono_domain_get ();
619 MonoArray *ta = ex->trace_ips;
624 /* Exception is not thrown yet */
627 len = mono_array_length (ta) >> 1;
628 trace_str = g_string_new ("");
629 for (i = 0; i < len; i++) {
631 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
632 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
634 ji = mono_jit_info_table_find (domain, ip);
636 /* Unmanaged frame */
637 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
641 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
643 address = (char *)ip - (char *)ji->code_start;
644 location = mono_debug_print_stack_frame (
645 method, address, ex->object.vtable->domain);
647 g_string_append_printf (trace_str, "%s\n", location);
652 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
653 g_string_free (trace_str, TRUE);
659 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
661 MonoDomain *domain = mono_domain_get ();
663 MonoArray *ta = exc->trace_ips;
664 MonoDebugSourceLocation *location;
668 /* Exception is not thrown yet */
669 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
672 len = mono_array_length (ta) >> 1;
674 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
676 for (i = skip; i < len; i++) {
678 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
679 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
680 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
683 ji = mono_jit_info_table_find (domain, ip);
685 /* Unmanaged frame */
686 mono_array_setref (res, i, sf);
690 g_assert (ji != NULL);
692 method = get_method_from_stack_frame (ji, generic_info);
693 if (jinfo_get_method (ji)->wrapper_type) {
697 s = mono_method_full_name (method, TRUE);
698 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
702 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
704 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
705 sf->method_address = (gsize) ji->code_start;
706 sf->native_offset = (char *)ip - (char *)ji->code_start;
709 * mono_debug_lookup_source_location() returns both the file / line number information
710 * and the IL offset. Note that computing the IL offset is already an expensive
711 * operation, so we shouldn't call this method twice.
713 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
715 sf->il_offset = location->il_offset;
718 if (find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
719 sf->il_offset = sp.il_offset;
724 if (need_file_info) {
725 if (location && location->source_file) {
726 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
727 sf->line = location->row;
728 sf->column = location->column;
730 sf->line = sf->column = 0;
735 mono_debug_free_source_location (location);
736 mono_array_setref (res, i, sf);
743 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
746 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
747 if (jit_tls && jit_tls->orig_ex_ctx_set)
748 start_ctx = &jit_tls->orig_ex_ctx;
750 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
753 * mono_walk_stack_with_ctx:
755 * Unwind the current thread starting at @start_ctx.
757 * If @start_ctx is null, we capture the current context.
760 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
762 MonoContext extra_ctx;
763 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
764 MONO_ARCH_CONTEXT_DEF
766 if (!thread || !thread->jit_data)
770 mono_arch_flush_register_windows ();
772 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
773 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
775 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
777 start_ctx = &extra_ctx;
780 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
784 * mono_walk_stack_with_state:
786 * Unwind a thread described by @state.
788 * State must be valid (state->valid == TRUE).
790 * If you are using this function to unwind another thread, make sure it is suspended.
792 * If @state is null, we capture the current context.
795 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
797 MonoThreadUnwindState extra_state;
799 g_assert (!mono_thread_info_is_async_context ());
800 if (!mono_thread_state_init_from_current (&extra_state))
802 state = &extra_state;
805 g_assert (state->valid);
807 mono_walk_stack_full (func,
809 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
810 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
811 state->unwind_data [MONO_UNWIND_DATA_LMF],
812 unwind_options, user_data);
816 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
818 MonoThreadUnwindState state;
819 if (!mono_thread_state_init_from_current (&state))
821 mono_walk_stack_with_state (func, &state, options, user_data);
825 * mono_walk_stack_full:
826 * @func: callback to call for each stack frame
827 * @domain: starting appdomain, can be NULL to use the current domain
828 * @unwind_options: what extra information the unwinder should gather
829 * @start_ctx: starting state of the stack walk, can be NULL.
830 * @thread: the thread whose stack to walk, can be NULL to use the current thread
831 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
832 * @user_data: data passed to the callback
834 * This function walks the stack of a thread, starting from the state
835 * represented by start_ctx. For each frame the callback
836 * function is called with the relevant info. The walk ends when no more
837 * managed stack frames are found or when the callback returns a TRUE value.
840 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
843 MonoContext ctx, new_ctx;
844 StackFrameInfo frame;
846 mgreg_t *reg_locations [MONO_MAX_IREGS];
847 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
848 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
849 gboolean async = mono_thread_info_is_async_context ();
851 g_assert (start_ctx);
854 /*The LMF will be null if the target have no managed frames.*/
855 /* g_assert (lmf); */
858 g_assert (unwind_options == MONO_UNWIND_NONE);
860 memcpy (&ctx, start_ctx, sizeof (MonoContext));
861 memset (reg_locations, 0, sizeof (reg_locations));
863 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
865 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
869 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
870 MonoDebugSourceLocation *source;
872 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
874 il_offset = source->il_offset;
877 if (find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
878 il_offset = sp.il_offset;
882 mono_debug_free_source_location (source);
886 frame.il_offset = il_offset;
888 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
889 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
891 frame.actual_method = frame.method;
894 if (get_reg_locations)
895 frame.reg_locations = reg_locations;
897 if (func (&frame, &ctx, user_data))
900 if (get_reg_locations) {
901 for (i = 0; i < MONO_MAX_IREGS; ++i)
902 if (new_reg_locations [i])
903 reg_locations [i] = new_reg_locations [i];
911 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
912 MonoReflectionMethod **method,
913 gint32 *iloffset, gint32 *native_offset,
914 MonoString **file, gint32 *line, gint32 *column)
916 MonoDomain *domain = mono_domain_get ();
917 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
918 MonoLMF *lmf = mono_get_lmf ();
919 MonoJitInfo *ji = NULL;
920 MonoContext ctx, new_ctx;
921 MonoDebugSourceLocation *location;
922 MonoMethod *jmethod = NULL, *actual_method;
923 StackFrameInfo frame;
926 MONO_ARCH_CONTEXT_DEF;
928 mono_arch_flush_register_windows ();
930 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
931 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
933 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
939 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
943 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
947 *native_offset = frame.native_offset;
949 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
950 jmethod = jinfo_get_method (ji);
951 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
956 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
958 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
960 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
962 *iloffset = location->il_offset;
966 if (need_file_info) {
968 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
969 *line = location->row;
970 *column = location->column;
977 mono_debug_free_source_location (location);
984 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
991 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
997 glist_to_array (GList *list, MonoClass *eclass)
999 MonoDomain *domain = mono_domain_get ();
1006 len = g_list_length (list);
1007 res = mono_array_new (domain, eclass, len);
1009 for (i = 0; list; list = list->next, i++)
1010 mono_array_set (res, gpointer, i, list->data);
1016 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1018 MonoClass *catch_class = ei->data.catch_class;
1019 MonoType *inflated_type;
1020 MonoGenericContext context;
1022 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1023 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1026 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1028 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1030 /* FIXME: we shouldn't inflate but instead put the
1031 type in the rgctx and fetch it from there. It
1032 might be a good idea to do this lazily, i.e. only
1033 when the exception is actually thrown, so as not to
1034 waste space for exception clauses which might never
1036 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1037 catch_class = mono_class_from_mono_type (inflated_type);
1038 mono_metadata_free_type (inflated_type);
1044 * mini_jit_info_table_find_ext:
1046 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1047 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1048 * OUT_DOMAIN if it is not NULL.
1051 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1054 MonoInternalThread *t = mono_thread_internal_current ();
1060 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1063 *out_domain = domain;
1067 /* maybe it is shared code, so we also search in the root domain */
1068 if (domain != mono_get_root_domain ()) {
1069 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1072 *out_domain = mono_get_root_domain ();
1080 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1081 for (; refs && *refs; refs++) {
1082 if (*refs != domain && *refs != mono_get_root_domain ()) {
1083 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1086 *out_domain = (MonoDomain*) *refs;
1096 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1098 return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
1102 * wrap_non_exception_throws:
1104 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1105 * WrapNonExceptionThrows flag set.
1108 wrap_non_exception_throws (MonoMethod *m)
1110 MonoAssembly *ass = m->klass->image->assembly;
1111 MonoCustomAttrInfo* attrs;
1112 static MonoClass *klass;
1114 gboolean val = FALSE;
1117 if (ass->wrap_non_exception_throws_inited)
1118 return ass->wrap_non_exception_throws;
1120 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1122 attrs = mono_custom_attrs_from_assembly (ass);
1124 for (i = 0; i < attrs->num_attrs; ++i) {
1125 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1127 int num_named, named_type, name_len;
1130 if (!attr->ctor || attr->ctor->klass != klass)
1132 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1133 p = (const char*)attr->data;
1134 g_assert (read16 (p) == 0x0001);
1136 num_named = read16 (p);
1142 /* data_type = *p; */
1145 if (named_type != 0x54)
1147 name_len = mono_metadata_decode_blob_size (p, &p);
1148 name = g_malloc (name_len + 1);
1149 memcpy (name, p, name_len);
1150 name [name_len] = 0;
1152 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1154 /* The value is a BOOLEAN */
1157 mono_custom_attrs_free (attrs);
1160 ass->wrap_non_exception_throws = val;
1161 mono_memory_barrier ();
1162 ass->wrap_non_exception_throws_inited = TRUE;
1167 #ifndef MONO_ARCH_STACK_GROWS_UP
1168 #define DOES_STACK_GROWS_UP 1
1170 #define DOES_STACK_GROWS_UP 0
1173 #define MAX_UNMANAGED_BACKTRACE 128
1175 build_native_trace (void)
1177 /* This puppy only makes sense on mobile, IOW, ARM. */
1178 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1180 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1181 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1186 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1188 for (i = 0; i < size; i++)
1189 mono_array_set (res, gpointer, i, native_trace [i]);
1196 #define setup_managed_stacktrace_information() do { \
1197 if (mono_ex && !initial_trace_ips) { \
1198 trace_ips = g_list_reverse (trace_ips); \
1199 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1200 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1201 if (has_dynamic_methods) \
1202 /* These methods could go away anytime, so compute the stack trace now */ \
1203 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1205 g_list_free (trace_ips); \
1209 * mono_handle_exception_internal_first_pass:
1211 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1212 * OBJ is found. Run the index of the filter clause which caught the exception into
1213 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1216 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1218 MonoDomain *domain = mono_domain_get ();
1219 MonoJitInfo *ji = NULL;
1220 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1221 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1222 MonoLMF *lmf = mono_get_lmf ();
1223 MonoArray *initial_trace_ips = NULL;
1224 GList *trace_ips = NULL;
1225 MonoException *mono_ex;
1226 gboolean stack_overflow = FALSE;
1227 MonoContext initial_ctx;
1229 int frame_count = 0;
1230 gboolean has_dynamic_methods = FALSE;
1235 g_assert (ctx != NULL);
1237 if (obj == domain->stack_overflow_ex)
1238 stack_overflow = TRUE;
1240 mono_ex = (MonoException*)obj;
1241 initial_trace_ips = mono_ex->trace_ips;
1243 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1244 mono_ex = (MonoException*)obj;
1245 initial_trace_ips = mono_ex->trace_ips;
1251 call_filter = mono_get_call_filter ();
1253 g_assert (jit_tls->end_of_stack);
1254 g_assert (jit_tls->abort_func);
1257 *out_filter_idx = -1;
1261 *out_prev_ji = NULL;
1266 MonoContext new_ctx;
1268 int clause_index_start = 0;
1269 gboolean unwind_res = TRUE;
1271 StackFrameInfo frame;
1276 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1278 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1282 g_assert (frame.type == FRAME_TYPE_MANAGED);
1287 setup_managed_stacktrace_information ();
1292 method = jinfo_get_method (ji);
1293 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1295 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1296 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1297 "The native frame called the managed method:\n%s\n",
1298 mono_method_full_name (method, TRUE));
1301 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1303 * Avoid overwriting the stack trace if the exception is
1304 * rethrown. Also avoid giant stack traces during a stack
1307 if (!initial_trace_ips && (frame_count < 1000)) {
1308 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1309 trace_ips = g_list_prepend (trace_ips,
1310 get_generic_info_from_stack_frame (ji, ctx));
1314 if (method->dynamic)
1315 has_dynamic_methods = TRUE;
1317 if (stack_overflow) {
1318 if (DOES_STACK_GROWS_UP)
1319 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1321 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1323 free_stack = 0xffffff;
1326 for (i = clause_index_start; i < ji->num_clauses; i++) {
1327 MonoJitExceptionInfo *ei = &ji->clauses [i];
1328 gboolean filtered = FALSE;
1331 * During stack overflow, wait till the unwinding frees some stack
1332 * space before running handlers/finalizers.
1334 if (free_stack <= (64 * 1024))
1337 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1339 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1342 * Have to unwrap RuntimeWrappedExceptions if the
1343 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1345 if (non_exception && !wrap_non_exception_throws (method))
1346 ex_obj = non_exception;
1350 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1351 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1352 #ifndef DISABLE_PERFCOUNTERS
1353 mono_perfcounters->exceptions_filters++;
1356 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1357 trim the stackframe since if it returns FALSE we lose information.
1359 FIXME Not 100% sure if it's a good idea even with user clauses.
1362 setup_managed_stacktrace_information ();
1364 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1366 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1368 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1369 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1371 g_assert (!ji->from_llvm);
1372 /* store the exception object in bp + ei->exvar_offset */
1373 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1376 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1378 * Pass the original il clause index to the landing pad so it can
1379 * branch to the landing pad associated with the il clause.
1380 * This is needed because llvm compiled code assumes that the EH
1381 * code always branches to the innermost landing pad.
1384 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1387 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1388 filtered = call_filter (ctx, ei->data.filter);
1389 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1390 if (filtered && out_filter_idx)
1391 *out_filter_idx = filter_idx;
1398 setup_managed_stacktrace_information ();
1399 /* mono_debugger_agent_handle_exception () needs this */
1400 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1405 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1406 setup_managed_stacktrace_information ();
1411 /* mono_debugger_agent_handle_exception () needs this */
1412 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1421 g_assert_not_reached ();
1425 * mono_handle_exception_internal:
1426 * @ctx: saved processor state
1427 * @obj: the exception object
1428 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1431 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1433 MonoDomain *domain = mono_domain_get ();
1434 MonoJitInfo *ji, *prev_ji;
1435 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1436 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1437 MonoLMF *lmf = mono_get_lmf ();
1438 MonoException *mono_ex;
1439 gboolean stack_overflow = FALSE;
1440 MonoContext initial_ctx;
1442 int frame_count = 0;
1443 gint32 filter_idx, first_filter_idx = 0;
1446 MonoObject *non_exception = NULL;
1448 g_assert (ctx != NULL);
1450 MonoException *ex = mono_get_exception_null_reference ();
1451 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1452 obj = (MonoObject *)ex;
1456 * Allocate a new exception object instead of the preconstructed ones.
1458 if (obj == domain->stack_overflow_ex) {
1460 * It is not a good idea to try and put even more pressure on the little stack available.
1461 * obj = mono_get_exception_stack_overflow ();
1463 stack_overflow = TRUE;
1465 else if (obj == domain->null_reference_ex) {
1466 obj = mono_get_exception_null_reference ();
1469 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1470 non_exception = obj;
1471 obj = mono_get_exception_runtime_wrapped (obj);
1474 mono_ex = (MonoException*)obj;
1476 if (mini_get_debug_options ()->suspend_on_exception) {
1477 mono_runtime_printf_err ("Exception thrown, suspending...");
1482 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1483 mono_ex = (MonoException*)obj;
1488 if (mono_ex && jit_tls->class_cast_from) {
1489 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1490 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1491 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1492 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1493 mono_ex->message = mono_string_new (domain, msg);
1498 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1499 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1500 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1501 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1502 mono_ex->message = mono_string_new (domain, msg);
1510 call_filter = mono_get_call_filter ();
1512 g_assert (jit_tls->end_of_stack);
1513 g_assert (jit_tls->abort_func);
1516 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1517 * end up being TRUE on any code path.
1519 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1524 MonoContext ctx_cp = *ctx;
1525 if (mono_trace_is_enabled ()) {
1526 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1527 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1528 MonoObject *message;
1529 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1531 MonoObject *exc = NULL;
1532 if (get_message == NULL) {
1534 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1536 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1538 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1542 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1544 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1546 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1547 mono_print_thread_dump_from_ctx (ctx);
1549 jit_tls->orig_ex_ctx_set = TRUE;
1550 mono_profiler_exception_thrown (obj);
1551 jit_tls->orig_ex_ctx_set = FALSE;
1553 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1556 if (mini_get_debug_options ()->break_on_exc)
1558 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1560 if (mini_get_debug_options ()->suspend_on_unhandled) {
1561 mono_runtime_printf_err ("Unhandled exception, suspending...");
1566 // FIXME: This runs managed code so it might cause another stack overflow when
1567 // we are handling a stack overflow
1568 mono_unhandled_exception (obj);
1570 gboolean unhandled = FALSE;
1573 * The exceptions caught by the mono_runtime_invoke () calls in mono_async_invoke () needs to be treated as
1574 * unhandled (#669836).
1575 * FIXME: The check below is hackish, but its hard to distinguish these runtime invoke calls from others
1578 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1580 MonoInternalThread *thread = mono_thread_internal_current ();
1581 if (jinfo_get_method (prev_ji) == thread->async_invoke_method)
1586 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1588 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1598 MonoContext new_ctx;
1600 int clause_index_start = 0;
1601 gboolean unwind_res = TRUE;
1605 ji = jit_tls->resume_state.ji;
1606 new_ctx = jit_tls->resume_state.new_ctx;
1607 clause_index_start = jit_tls->resume_state.clause_index;
1608 lmf = jit_tls->resume_state.lmf;
1609 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1610 filter_idx = jit_tls->resume_state.filter_idx;
1612 StackFrameInfo frame;
1614 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1616 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1620 g_assert (frame.type == FRAME_TYPE_MANAGED);
1626 *(mono_get_lmf_addr ()) = lmf;
1628 jit_tls->abort_func (obj);
1629 g_assert_not_reached ();
1632 method = jinfo_get_method (ji);
1634 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1636 if (stack_overflow) {
1637 if (DOES_STACK_GROWS_UP)
1638 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1640 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1642 free_stack = 0xffffff;
1645 for (i = clause_index_start; i < ji->num_clauses; i++) {
1646 MonoJitExceptionInfo *ei = &ji->clauses [i];
1647 gboolean filtered = FALSE;
1650 * During stack overflow, wait till the unwinding frees some stack
1651 * space before running handlers/finalizers.
1653 if (free_stack <= (64 * 1024))
1656 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1658 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1661 * Have to unwrap RuntimeWrappedExceptions if the
1662 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1664 if (non_exception && !wrap_non_exception_throws (method))
1665 ex_obj = non_exception;
1669 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1670 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1671 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1673 g_assert (!ji->from_llvm);
1674 /* store the exception object in bp + ei->exvar_offset */
1675 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1679 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1681 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1684 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1686 * Filter clauses should only be run in the
1687 * first pass of exception handling.
1689 filtered = (filter_idx == first_filter_idx);
1693 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1694 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1696 * This guards against the situation that we abort a thread that is executing a finally clause
1697 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1698 * check for this situation here and resume interruption if we are below the guarded block.
1700 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1701 gboolean is_outside = FALSE;
1702 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1703 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1704 //FIXME make this stack direction aware
1705 if (catch_bp > prot_bp) {
1707 } else if (catch_bp == prot_bp) {
1708 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1709 * So we check if the catch handler_start is protected by the guarded handler protected region
1712 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1713 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1714 * There aren't any further finally/fault handler blocks down the stack over this exception.
1715 * This must be ensured by the code that installs the guard trampoline.
1717 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1719 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1724 jit_tls->handler_block_return_address = NULL;
1725 jit_tls->handler_block = NULL;
1726 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1730 if (mono_trace_is_enabled () && mono_trace_eval (method))
1731 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1732 jit_tls->orig_ex_ctx_set = TRUE;
1733 mono_profiler_exception_clause_handler (method, ei->flags, i);
1734 jit_tls->orig_ex_ctx_set = FALSE;
1735 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1737 #ifndef DISABLE_PERFCOUNTERS
1738 mono_perfcounters->exceptions_depth += frame_count;
1740 if (obj == domain->stack_overflow_ex)
1741 jit_tls->handling_stack_ovf = FALSE;
1745 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1746 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1747 if (mono_trace_is_enabled () && mono_trace_eval (method))
1748 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1749 jit_tls->orig_ex_ctx_set = TRUE;
1750 mono_profiler_exception_clause_handler (method, ei->flags, i);
1751 jit_tls->orig_ex_ctx_set = FALSE;
1752 call_filter (ctx, ei->handler_start);
1754 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1755 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1756 if (mono_trace_is_enabled () && mono_trace_eval (method))
1757 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1758 jit_tls->orig_ex_ctx_set = TRUE;
1759 mono_profiler_exception_clause_handler (method, ei->flags, i);
1760 jit_tls->orig_ex_ctx_set = FALSE;
1761 #ifndef DISABLE_PERFCOUNTERS
1762 mono_perfcounters->exceptions_finallys++;
1765 if (ji->from_llvm) {
1767 * LLVM compiled finally handlers follow the design
1768 * of the c++ ehabi, i.e. they call a resume function
1769 * at the end instead of returning to the caller.
1770 * So save the exception handling state,
1771 * mono_resume_unwind () will call us again to continue
1774 jit_tls->resume_state.ex_obj = obj;
1775 jit_tls->resume_state.ji = ji;
1776 jit_tls->resume_state.clause_index = i + 1;
1777 jit_tls->resume_state.ctx = *ctx;
1778 jit_tls->resume_state.new_ctx = new_ctx;
1779 jit_tls->resume_state.lmf = lmf;
1780 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1781 jit_tls->resume_state.filter_idx = filter_idx;
1782 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1785 call_filter (ctx, ei->handler_start);
1791 jit_tls->orig_ex_ctx_set = TRUE;
1792 mono_profiler_exception_method_leave (method);
1793 jit_tls->orig_ex_ctx_set = FALSE;
1798 g_assert_not_reached ();
1802 * mono_debugger_run_finally:
1803 * @start_ctx: saved processor state
1805 * This method is called by the Mono Debugger to call all `finally' clauses of the
1806 * current stack frame. It's used when the user issues a `return' command to make
1807 * the current stack frame return. After returning from this method, the debugger
1808 * unwinds the stack one frame and gives control back to the user.
1810 * NOTE: This method is only used when running inside the Mono Debugger.
1813 mono_debugger_run_finally (MonoContext *start_ctx)
1815 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1816 MonoDomain *domain = mono_domain_get ();
1817 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1818 MonoLMF *lmf = mono_get_lmf ();
1819 MonoContext ctx, new_ctx;
1820 MonoJitInfo *ji, rji;
1825 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1826 if (!ji || ji == (gpointer)-1)
1830 call_filter = mono_get_call_filter ();
1832 for (i = 0; i < ji->num_clauses; i++) {
1833 MonoJitExceptionInfo *ei = &ji->clauses [i];
1835 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1836 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1837 call_filter (&ctx, ei->handler_start);
1843 * mono_handle_exception:
1844 * @ctx: saved processor state
1845 * @obj: the exception object
1848 mono_handle_exception (MonoContext *ctx, gpointer obj)
1850 #ifndef DISABLE_PERFCOUNTERS
1851 mono_perfcounters->exceptions_thrown++;
1854 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1857 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1859 #ifndef MONO_ARCH_USE_SIGACTION
1860 #error "Can't use sigaltstack without sigaction"
1863 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1866 mono_setup_altstack (MonoJitTlsData *tls)
1870 guint8 *staddr = NULL;
1872 if (mono_running_on_valgrind ())
1875 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1879 tls->end_of_stack = staddr + stsize;
1880 tls->stack_size = stsize;
1882 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1884 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1885 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1887 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1889 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1890 /* mprotect can fail for the main thread stack */
1891 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);
1892 g_assert (gaddr == tls->stack_ovf_guard_base);
1893 tls->stack_ovf_valloced = TRUE;
1896 /* Setup an alternate signal stack */
1897 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1898 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1900 g_assert (tls->signal_stack);
1902 sa.ss_sp = tls->signal_stack;
1903 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1905 g_assert (sigaltstack (&sa, NULL) == 0);
1907 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);
1911 mono_free_altstack (MonoJitTlsData *tls)
1916 sa.ss_sp = tls->signal_stack;
1917 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1918 sa.ss_flags = SS_DISABLE;
1919 err = sigaltstack (&sa, NULL);
1920 g_assert (err == 0);
1922 if (tls->signal_stack)
1923 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1924 if (tls->stack_ovf_valloced)
1925 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1927 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1930 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1933 mono_setup_altstack (MonoJitTlsData *tls)
1938 mono_free_altstack (MonoJitTlsData *tls)
1942 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1945 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1947 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1948 /* we need to leave some room for throwing the exception */
1949 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1950 unprotect_size -= mono_pagesize ();
1951 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1952 * is sufficient stack
1954 //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);
1956 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1957 return unprotect_size == jit_tls->stack_ovf_guard_size;
1960 static G_GNUC_UNUSED void
1961 try_more_restore (void)
1963 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1964 if (try_restore_stack_protection (jit_tls, 500))
1965 jit_tls->restore_stack_prot = NULL;
1968 static G_GNUC_UNUSED void
1969 restore_stack_protection (void)
1971 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1972 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1973 /* if we can't restore the stack protection, keep a callback installed so
1974 * we'll try to restore as much stack as we can at each return from unmanaged
1977 if (try_restore_stack_protection (jit_tls, 4096))
1978 jit_tls->restore_stack_prot = NULL;
1980 jit_tls->restore_stack_prot = try_more_restore_tramp;
1981 /* here we also throw a stack overflow exception */
1982 ex->trace_ips = NULL;
1983 ex->stack_trace = NULL;
1984 mono_raise_exception (ex);
1988 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1990 void (*func)(void) = (gpointer)tramp_data;
1996 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1998 /* we got a stack overflow in the soft-guard pages
1999 * There are two cases:
2000 * 1) managed code caused the overflow: we unprotect the soft-guard page
2001 * and let the arch-specific code trigger the exception handling mechanism
2002 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2003 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2004 * and hope we can continue with those enabled, at least until the hard-guard page
2005 * is hit. The alternative to continuing here is to just print a message and abort.
2006 * We may add in the future the code to protect the pages again in the codepath
2007 * when we return from unmanaged to managed code.
2009 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2010 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2011 /* we unprotect the minimum amount we can */
2013 gboolean handled = FALSE;
2015 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2016 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2017 guard_size -= mono_pagesize ();
2019 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2020 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2021 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);
2022 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2024 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2029 /* We print a message: after this even managed stack overflows
2030 * may crash the runtime
2032 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2033 if (!jit_tls->handling_stack_ovf) {
2034 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2035 jit_tls->handling_stack_ovf = 1;
2037 /*fprintf (stderr, "Already handling stack overflow\n");*/
2046 MonoMethod *omethod;
2048 } PrintOverflowUserData;
2050 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2052 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2054 MonoMethod *method = NULL;
2055 PrintOverflowUserData *user_data = data;
2059 method = jinfo_get_method (frame->ji);
2062 if (user_data->count == 0) {
2063 /* The first frame is in its prolog, so a line number cannot be computed */
2064 user_data->count ++;
2068 /* If this is a one method overflow, skip the other instances */
2069 if (method == user_data->omethod)
2072 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2073 mono_runtime_printf_err (" %s", location);
2076 if (user_data->count == 1) {
2077 mono_runtime_printf_err (" <...>");
2078 user_data->omethod = method;
2080 user_data->omethod = NULL;
2083 user_data->count ++;
2085 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2092 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2094 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2095 PrintOverflowUserData ud;
2099 /* we don't do much now, but we can warn the user with a useful message */
2100 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2102 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2103 mono_sigctx_to_monoctx (ctx, &mctx);
2105 mono_runtime_printf_err ("Stacktrace:");
2107 memset (&ud, 0, sizeof (ud));
2109 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2111 if (ji && jinfo_get_method (ji))
2112 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2114 mono_runtime_printf_err ("At <unmanaged>.");
2121 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2123 MonoMethod *method = NULL;
2126 method = jinfo_get_method (frame->ji);
2129 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2130 mono_runtime_printf_err (" %s", location);
2133 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2138 static G_GNUC_UNUSED gboolean
2139 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2141 GString *p = (GString*)data;
2142 MonoMethod *method = NULL;
2145 method = jinfo_get_method (frame->ji);
2147 if (method && frame->domain) {
2148 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2149 g_string_append_printf (p, " %s\n", location);
2152 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2157 #ifndef MONO_CROSS_COMPILE
2159 static gboolean handling_sigsegv = FALSE;
2162 * mono_handle_native_sigsegv:
2164 * Handle a SIGSEGV received while in native code by printing diagnostic
2165 * information and aborting.
2168 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2170 #ifdef MONO_ARCH_USE_SIGACTION
2171 struct sigaction sa;
2173 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2174 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2176 if (handling_sigsegv)
2179 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2180 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2191 /* To prevent infinite loops when the stack walk causes a crash */
2192 handling_sigsegv = TRUE;
2194 /* !jit_tls means the thread was not registered with the runtime */
2195 if (jit_tls && mono_thread_internal_current ()) {
2196 mono_runtime_printf_err ("Stacktrace:\n");
2198 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2201 #ifdef HAVE_BACKTRACE_SYMBOLS
2207 mono_runtime_printf_err ("\nNative stacktrace:\n");
2209 size = backtrace (array, 256);
2210 names = backtrace_symbols (array, size);
2211 for (i =0; i < size; ++i) {
2212 mono_runtime_printf_err ("\t%s", names [i]);
2216 /* Try to get more meaningful information using gdb */
2218 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2219 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2220 /* From g_spawn_command_line_sync () in eglib */
2223 pid_t crashed_pid = getpid ();
2227 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2228 * it will deadlock. Call the syscall directly instead.
2230 pid = mono_runtime_syscall_fork ();
2233 dup2 (STDERR_FILENO, STDOUT_FILENO);
2235 mono_gdb_render_native_backtraces (crashed_pid);
2239 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2240 waitpid (pid, &status, 0);
2244 #elif defined (ENABLE_EXTENSION_MODULE)
2245 mono_extension_handle_native_sigsegv (ctx, info);
2249 * A SIGSEGV indicates something went very wrong so we can no longer depend
2250 * on anything working. So try to print out lots of diagnostics, starting
2251 * with ones which have a greater chance of working.
2253 mono_runtime_printf_err (
2255 "=================================================================\n"
2256 "Got a %s while executing native code. This usually indicates\n"
2257 "a fatal error in the mono runtime or one of the native libraries \n"
2258 "used by your application.\n"
2259 "=================================================================\n",
2263 #ifdef MONO_ARCH_USE_SIGACTION
2265 /* Remove our SIGABRT handler */
2266 sa.sa_handler = SIG_DFL;
2267 sigemptyset (&sa.sa_mask);
2270 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2274 if (!mono_do_crash_chaining) {
2275 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2276 #if defined (PLATFORM_ANDROID)
2287 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2289 g_assert_not_reached ();
2292 #endif /* !MONO_CROSS_COMPILE */
2295 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2297 MonoInternalThread *thread = mono_thread_internal_current ();
2298 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2306 GError *error = NULL;
2311 text = g_string_new (0);
2313 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2315 g_string_append_printf (text, "\n\"%s\"", name);
2318 else if (thread->threadpool_thread)
2319 g_string_append (text, "\n\"<threadpool thread>\"");
2321 g_string_append (text, "\n\"<unnamed thread>\"");
2324 wapi_desc = wapi_current_thread_desc ();
2325 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2329 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2331 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2333 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2335 mono_sigctx_to_monoctx (sigctx, &ctx);
2337 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2339 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2342 mono_runtime_printf ("%s", text->str);
2344 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2345 OutputDebugStringA(text->str);
2348 g_string_free (text, TRUE);
2349 mono_runtime_stdout_fflush ();
2353 * mono_print_thread_dump:
2355 * Print information about the current thread to stdout.
2356 * SIGCTX can be NULL, allowing this to be called from gdb.
2359 mono_print_thread_dump (void *sigctx)
2361 mono_print_thread_dump_internal (sigctx, NULL);
2365 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2367 mono_print_thread_dump_internal (NULL, ctx);
2371 * mono_resume_unwind:
2373 * This is called by a trampoline from LLVM compiled finally clauses to continue
2377 mono_resume_unwind (MonoContext *ctx)
2379 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2380 MonoContext new_ctx;
2382 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2383 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2386 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2388 mono_restore_context (&new_ctx);
2391 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2396 MonoJitExceptionInfo *ei;
2397 } FindHandlerBlockData;
2400 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2404 FindHandlerBlockData *pdata = data;
2405 MonoJitInfo *ji = frame->ji;
2410 ip = MONO_CONTEXT_GET_IP (ctx);
2412 for (i = 0; i < ji->num_clauses; ++i) {
2413 MonoJitExceptionInfo *ei = ji->clauses + i;
2414 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2416 /*If ip points to the first instruction it means the handler block didn't start
2417 so we can leave its execution to the EH machinery*/
2418 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2430 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2433 MonoJitExceptionInfo *clause = NULL;
2436 ip = MONO_CONTEXT_GET_IP (ctx);
2438 for (i = 0; i < ji->num_clauses; ++i) {
2439 clause = &ji->clauses [i];
2440 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2442 if (clause->handler_start < ip && clause->data.handler_end > ip)
2446 /*no matching finally */
2447 if (i == ji->num_clauses)
2450 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2451 if (ip == clause->handler_start)
2454 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2458 * Finds the bottom handler block running and install a block guard if needed.
2459 * FIXME add full-aot support.
2462 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2464 FindHandlerBlockData data = { 0 };
2465 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2472 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2473 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2475 if (!jit_tls || jit_tls->handler_block_return_address)
2478 /* Do an async safe stack walk */
2479 mono_thread_info_set_is_async_context (TRUE);
2480 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2481 mono_thread_info_set_is_async_context (FALSE);
2486 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2488 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2489 if (resume_ip == NULL)
2492 jit_tls->handler_block_return_address = resume_ip;
2493 jit_tls->handler_block = data.ei;
2500 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2508 mono_set_cast_details (MonoClass *from, MonoClass *to)
2510 MonoJitTlsData *jit_tls = NULL;
2512 if (mini_get_debug_options ()->better_cast_details) {
2513 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2514 jit_tls->class_cast_from = from;
2515 jit_tls->class_cast_to = to;
2520 /*returns false if the thread is not attached*/
2522 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2524 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2525 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2533 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2535 #if defined(MONO_CROSS_COMPILE)
2536 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2537 #elif MONO_ARCH_HAS_MONO_CONTEXT
2538 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2540 g_error ("Use a null sigctx requires a working mono-context");
2543 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2544 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2545 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2549 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2555 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2557 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2564 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2565 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2566 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2571 /*returns false if the thread is not attached*/
2573 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2575 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2576 MONO_ARCH_CONTEXT_DEF
2578 mono_arch_flush_register_windows ();
2580 if (!thread || !thread->jit_data) {
2584 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2585 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2587 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2590 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2591 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2592 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2598 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2600 mono_handle_exception (ctx, exc);
2601 mono_restore_context (ctx);
2604 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2606 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2608 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2609 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2610 jit_tls->ex_ctx = *ctx;
2612 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2614 g_error ("This target doesn't support mono_arch_setup_async_callback");
2619 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2621 unhandled_exception_hook = func;
2622 unhandled_exception_hook_data = user_data;
2626 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2628 if (unhandled_exception_hook) {
2629 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2631 MonoObject *other = NULL;
2632 MonoString *str = mono_object_to_string (exc, &other);
2636 msg = mono_string_to_utf8 (str);
2638 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2639 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2641 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2642 original_backtrace, nested_backtrace);
2644 g_free (original_backtrace);
2645 g_free (nested_backtrace);
2647 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2649 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2651 #if defined(HOST_IOS)
2652 g_assertion_message ("Terminating runtime due to unhandled exception");
2654 exit (mono_environment_exitcode_get ());
2658 g_assert_not_reached ();
2662 * mono_restore_context:
2664 * Call the architecture specific restore context function.
2667 mono_restore_context (MonoContext *ctx)
2669 static void (*restore_context) (MonoContext *);
2671 if (!restore_context)
2672 restore_context = mono_get_restore_context ();
2673 restore_context (ctx);
2674 g_assert_not_reached ();
2678 * mono_jinfo_get_unwind_info:
2680 * Return the unwind info for JI.
2683 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2686 return mono_aot_get_unwind_info (ji, unwind_info_len);
2688 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2692 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2694 MonoArchEHJitInfo *info;
2696 info = mono_jit_info_get_arch_eh_info (ji);
2699 return info->epilog_size;