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).
18 #ifdef HAVE_EXECINFO_H
22 #ifdef HAVE_SYS_TYPES_H
23 #include <sys/types.h>
26 #ifdef HAVE_SYS_WAIT_H
34 #ifdef HAVE_SYS_SYSCALL_H
35 #include <sys/syscall.h>
38 #include <mono/metadata/appdomain.h>
39 #include <mono/metadata/tabledefs.h>
40 #include <mono/metadata/threads.h>
41 #include <mono/metadata/threads-types.h>
42 #include <mono/metadata/debug-helpers.h>
43 #include <mono/metadata/exception.h>
44 #include <mono/metadata/gc-internal.h>
45 #include <mono/metadata/mono-debug.h>
46 #include <mono/metadata/profiler.h>
47 #include <mono/metadata/mono-endian.h>
48 #include <mono/metadata/environment.h>
49 #include <mono/utils/mono-mmap.h>
50 #include <mono/utils/mono-logger-internal.h>
53 #include "debug-mini.h"
55 #include "debugger-agent.h"
57 #ifndef MONO_ARCH_CONTEXT_DEF
58 #define MONO_ARCH_CONTEXT_DEF
61 static gpointer restore_context_func, call_filter_func;
62 static gpointer throw_exception_func, rethrow_exception_func;
63 static gpointer throw_corlib_exception_func;
65 static gpointer try_more_restore_tramp = NULL;
66 static gpointer restore_stack_protection_tramp = NULL;
68 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
69 static gpointer unhandled_exception_hook_data = NULL;
71 static void try_more_restore (void);
72 static void restore_stack_protection (void);
73 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
74 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
75 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
78 mono_exceptions_init (void)
80 MonoRuntimeExceptionHandlingCallbacks cbs;
82 restore_context_func = mono_aot_get_trampoline ("restore_context");
83 call_filter_func = mono_aot_get_trampoline ("call_filter");
84 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
85 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
89 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
91 mono_save_trampoline_xdebug_info (info);
92 mono_tramp_info_free (info);
94 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
96 mono_save_trampoline_xdebug_info (info);
97 mono_tramp_info_free (info);
99 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
101 mono_save_trampoline_xdebug_info (info);
102 mono_tramp_info_free (info);
104 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
106 mono_save_trampoline_xdebug_info (info);
107 mono_tramp_info_free (info);
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_install_handler_block_guard = mono_install_handler_block_guard;
123 mono_install_eh_callbacks (&cbs);
127 mono_get_throw_exception (void)
129 g_assert (throw_exception_func);
130 return throw_exception_func;
134 mono_get_rethrow_exception (void)
136 g_assert (rethrow_exception_func);
137 return rethrow_exception_func;
141 mono_get_call_filter (void)
143 g_assert (call_filter_func);
144 return call_filter_func;
148 mono_get_restore_context (void)
150 g_assert (restore_context_func);
151 return restore_context_func;
155 mono_get_throw_corlib_exception (void)
157 gpointer code = NULL;
160 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
161 if (throw_corlib_exception_func)
162 return throw_corlib_exception_func;
165 code = mono_aot_get_trampoline ("throw_corlib_exception");
167 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
169 mono_save_trampoline_xdebug_info (info);
170 mono_tramp_info_free (info);
174 mono_memory_barrier ();
176 throw_corlib_exception_func = code;
178 return throw_corlib_exception_func;
182 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
184 MonoTryBlockHoleTableJitInfo *table;
189 if (ei->try_start > ip || ip >= ei->try_end)
192 if (!ji->has_try_block_holes)
195 table = mono_jit_info_get_try_block_hole_table_info (ji);
196 offset = (guint32)((char*)ip - (char*)ji->code_start);
197 clause = (guint16)(ei - ji->clauses);
198 g_assert (clause < ji->num_clauses);
200 for (i = 0; i < table->num_holes; ++i) {
201 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
202 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
211 * Translate between the mono_arch_find_jit_info function and the old API.
214 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
215 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
217 StackFrameInfo frame;
220 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
222 /* Avoid costly table lookup during stack overflow */
223 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
226 ji = mini_jit_info_table_find (domain, ip, NULL);
231 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
235 /* Convert between the new and the old APIs */
236 switch (frame.type) {
237 case FRAME_TYPE_MANAGED:
241 case FRAME_TYPE_MANAGED_TO_NATIVE:
245 memset (res, 0, sizeof (MonoJitInfo));
246 res->method = frame.method;
249 case FRAME_TYPE_DEBUGGER_INVOKE: {
253 * The normal exception handling code can't handle this frame, so just
256 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
257 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
261 g_assert_not_reached ();
266 /* mono_find_jit_info:
268 * This function is used to gather information from @ctx. It return the
269 * MonoJitInfo of the corresponding function, unwinds one stack frame and
270 * stores the resulting context into @new_ctx. It also stores a string
271 * describing the stack location into @trace (if not NULL), and modifies
272 * the @lmf if necessary. @native_offset return the IP offset from the
273 * start of the function or -1 if that info is not available.
276 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
277 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
281 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
293 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
295 if (ji == (gpointer)-1)
298 if (managed2 || (ji && ji->method->wrapper_type)) {
299 const char *real_ip, *start;
302 start = (const char *)ji->code_start;
304 /* ctx->ip points into native code */
305 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
307 real_ip = (const char*)ip;
309 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
310 offset = real_ip - start;
315 *native_offset = offset;
318 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
322 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
325 char *fname = mono_method_full_name (res->method, TRUE);
326 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
335 * mono_find_jit_info_ext:
337 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
339 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
340 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
341 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
342 * to obtain the last managed frame.
343 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
344 * On return, it will be filled with the locations where callee saved registers are saved
345 * by the current frame. This is returned outside of StackFrameInfo because it can be
346 * quite large on some platforms.
349 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
350 MonoJitInfo *prev_ji, MonoContext *ctx,
351 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
352 mgreg_t **save_locations,
353 StackFrameInfo *frame)
356 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
358 MonoDomain *target_domain;
363 /* Avoid costly table lookup during stack overflow */
364 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
367 ji = mini_jit_info_table_find (domain, ip, &target_domain);
370 target_domain = domain;
373 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
375 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
379 if (frame->type == FRAME_TYPE_MANAGED) {
380 if (!frame->ji->method->wrapper_type || frame->ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
381 frame->managed = TRUE;
384 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
386 * This type of frame is just a marker, the caller should unwind once more to get the
387 * last managed frame.
390 frame->method = NULL;
393 frame->native_offset = -1;
394 frame->domain = target_domain;
398 if (frame->type == FRAME_TYPE_MANAGED)
399 frame->method = ji->method;
401 if (ji && (frame->managed || ji->method->wrapper_type)) {
402 const char *real_ip, *start;
404 start = (const char *)ji->code_start;
406 /* ctx->ip points into native code */
407 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
409 real_ip = (const char*)ip;
411 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
412 frame->native_offset = real_ip - start;
414 frame->native_offset = -1;
417 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
419 if (trace && frame->method) {
420 char *fname = mono_method_full_name (frame->method, TRUE);
421 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
430 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
432 MonoGenericJitInfo *gi;
435 if (!ji->has_generic_jit_info)
437 gi = mono_jit_info_get_generic_jit_info (ji);
443 * Search location list if available, it contains the precise location of the
444 * argument for every pc offset, even if the method was interrupted while it was in
448 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
451 for (i = 0; i < gi->nlocs; ++i) {
452 MonoDwarfLocListEntry *entry = &gi->locations [i];
454 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
456 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
458 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
462 g_assert (i < gi->nlocs);
465 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
467 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
471 if (mono_method_get_context (ji->method)->method_inst) {
473 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
476 /* Avoid returning a managed object */
477 MonoObject *this_obj = info;
479 return this_obj->vtable->klass;
483 static MonoGenericContext
484 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
486 MonoGenericContext context = { NULL, NULL };
487 MonoClass *class, *method_container_class;
489 g_assert (generic_info);
491 g_assert (ji->method->is_inflated);
492 if (mono_method_get_context (ji->method)->method_inst) {
493 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
495 class = mrgctx->class_vtable->klass;
496 context.method_inst = mrgctx->method_inst;
497 g_assert (context.method_inst);
498 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
499 MonoVTable *vtable = generic_info;
501 class = vtable->klass;
503 class = generic_info;
506 //g_assert (!ji->method->klass->generic_container);
507 if (ji->method->klass->generic_class)
508 method_container_class = ji->method->klass->generic_class->container_class;
510 method_container_class = ji->method->klass;
512 /* class might refer to a subclass of ji->method's class */
513 while (!(class == ji->method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
514 class = class->parent;
518 if (class->generic_class || class->generic_container)
519 context.class_inst = mini_class_get_context (class)->class_inst;
521 if (class->generic_class)
522 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
524 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
530 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
532 MonoGenericContext context;
535 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
537 context = get_generic_context_from_stack_frame (ji, generic_info);
539 method = mono_method_get_declaring_generic_method (ji->method);
540 method = mono_class_inflate_generic_method (method, &context);
546 * mono_exception_walk_native_trace:
547 * @ex: The exception object whose frames should be walked
548 * @func: callback to call for each stack frame
549 * @user_data: data passed to the callback
551 * This function walks the stacktrace of an exception. For
552 * each frame the callback function is called with the relevant info.
553 * The walk ends when no more stack frames are found or when the callback
554 * returns a TRUE value.
558 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
560 MonoDomain *domain = mono_domain_get ();
561 MonoArray *ta = ex->trace_ips;
567 len = mono_array_length (ta) >> 1;
568 for (i = 0; i < len; i++) {
569 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
570 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
571 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
574 if (func (NULL, ip, 0, FALSE, user_data))
577 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
578 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
587 ves_icall_System_Exception_get_trace (MonoException *ex)
589 MonoDomain *domain = mono_domain_get ();
591 MonoArray *ta = ex->trace_ips;
596 /* Exception is not thrown yet */
599 len = mono_array_length (ta) >> 1;
600 trace_str = g_string_new ("");
601 for (i = 0; i < len; i++) {
603 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
604 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
606 ji = mono_jit_info_table_find (domain, ip);
608 /* Unmanaged frame */
609 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
613 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
615 address = (char *)ip - (char *)ji->code_start;
616 location = mono_debug_print_stack_frame (
617 method, address, ex->object.vtable->domain);
619 g_string_append_printf (trace_str, "%s\n", location);
624 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
625 g_string_free (trace_str, TRUE);
631 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
633 MonoDomain *domain = mono_domain_get ();
635 MonoArray *ta = exc->trace_ips;
636 MonoDebugSourceLocation *location;
640 /* Exception is not thrown yet */
641 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
644 len = mono_array_length (ta) >> 1;
646 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
648 for (i = skip; i < len; i++) {
650 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
651 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
652 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
655 ji = mono_jit_info_table_find (domain, ip);
657 /* Unmanaged frame */
658 mono_array_setref (res, i, sf);
662 g_assert (ji != NULL);
664 method = get_method_from_stack_frame (ji, generic_info);
665 if (ji->method->wrapper_type) {
669 s = mono_method_full_name (method, TRUE);
670 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
674 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
675 sf->native_offset = (char *)ip - (char *)ji->code_start;
678 * mono_debug_lookup_source_location() returns both the file / line number information
679 * and the IL offset. Note that computing the IL offset is already an expensive
680 * operation, so we shouldn't call this method twice.
682 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
684 sf->il_offset = location->il_offset;
688 if (need_file_info) {
689 if (location && location->source_file) {
690 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
691 sf->line = location->row;
692 sf->column = location->column;
694 sf->line = sf->column = 0;
699 mono_debug_free_source_location (location);
700 mono_array_setref (res, i, sf);
707 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
710 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
711 if (jit_tls && jit_tls->orig_ex_ctx_set)
712 start_ctx = &jit_tls->orig_ex_ctx;
714 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
717 * mono_walk_stack_with_ctx:
719 * Unwind the current thread starting at @start_ctx.
721 * If @start_ctx is null, we capture the current context.
724 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
726 MonoContext extra_ctx;
727 MonoInternalThread *thread = mono_thread_internal_current ();
728 MONO_ARCH_CONTEXT_DEF
730 if (!thread || !thread->jit_data)
734 mono_arch_flush_register_windows ();
736 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
737 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
739 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
741 start_ctx = &extra_ctx;
744 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
748 * mono_walk_stack_with_state:
750 * Unwind a thread described by @state.
752 * State must be valid (state->valid == TRUE).
754 * If you are using this function to unwind another thread, make sure it is suspended.
756 * If @state is null, we capture the current context.
759 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
761 MonoThreadUnwindState extra_state;
763 if (!mono_thread_state_init_from_current (&extra_state))
765 state = &extra_state;
768 g_assert (state->valid);
770 mono_walk_stack_full (func,
772 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
773 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
774 state->unwind_data [MONO_UNWIND_DATA_LMF],
775 unwind_options, user_data);
779 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
781 MonoThreadUnwindState state;
782 if (!mono_thread_state_init_from_current (&state))
784 mono_walk_stack_with_state (func, &state, options, user_data);
788 * mono_walk_stack_full:
789 * @func: callback to call for each stack frame
790 * @domain: starting appdomain, can be NULL to use the current domain
791 * @unwind_options: what extra information the unwinder should gather
792 * @start_ctx: starting state of the stack walk, can be NULL.
793 * @thread: the thread whose stack to walk, can be NULL to use the current thread
794 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
795 * @user_data: data passed to the callback
797 * This function walks the stack of a thread, starting from the state
798 * represented by start_ctx. For each frame the callback
799 * function is called with the relevant info. The walk ends when no more
800 * managed stack frames are found or when the callback returns a TRUE value.
803 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
806 MonoContext ctx, new_ctx;
807 StackFrameInfo frame;
809 mgreg_t *reg_locations [MONO_MAX_IREGS];
810 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
811 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
813 g_assert (start_ctx);
816 /*The LMF will be null if the target have no managed frames.*/
817 /* g_assert (lmf); */
819 memcpy (&ctx, start_ctx, sizeof (MonoContext));
820 memset (reg_locations, 0, sizeof (reg_locations));
822 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
824 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
828 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
829 MonoDebugSourceLocation *source;
831 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
832 il_offset = source ? source->il_offset : -1;
833 mono_debug_free_source_location (source);
837 frame.il_offset = il_offset;
839 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
840 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
842 frame.actual_method = frame.method;
845 if (get_reg_locations)
846 frame.reg_locations = reg_locations;
848 if (func (&frame, &ctx, user_data))
851 if (get_reg_locations) {
852 for (i = 0; i < MONO_MAX_IREGS; ++i)
853 if (new_reg_locations [i])
854 reg_locations [i] = new_reg_locations [i];
862 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
863 MonoReflectionMethod **method,
864 gint32 *iloffset, gint32 *native_offset,
865 MonoString **file, gint32 *line, gint32 *column)
867 MonoDomain *domain = mono_domain_get ();
868 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
869 MonoLMF *lmf = mono_get_lmf ();
870 MonoJitInfo *ji = NULL;
871 MonoContext ctx, new_ctx;
872 MonoDebugSourceLocation *location;
873 MonoMethod *actual_method;
874 StackFrameInfo frame;
877 MONO_ARCH_CONTEXT_DEF;
879 mono_arch_flush_register_windows ();
881 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
882 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
884 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
890 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
894 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
898 *native_offset = frame.native_offset;
900 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
901 if (ji->method->wrapper_type != MONO_WRAPPER_NONE && ji->method->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && ji->method->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
906 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
908 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
910 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
912 *iloffset = location->il_offset;
916 if (need_file_info) {
918 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
919 *line = location->row;
920 *column = location->column;
927 mono_debug_free_source_location (location);
934 MonoSecurityFrame *frame;
935 } MonoFrameSecurityInfo;
938 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
940 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
941 MonoJitInfo *ji = frame->ji;
946 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
947 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
948 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
949 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
950 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
951 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
960 si->frame = mono_declsec_create_frame (frame->domain, ji);
962 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
967 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
968 * @skip: the number of stack frames to skip
970 * This function returns a the security informations of a single stack frame
971 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
972 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
976 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
978 MonoFrameSecurityInfo si;
983 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
985 return (si.skips == 0) ? si.frame : NULL;
997 grow_array (MonoSecurityStack *stack)
999 MonoDomain *domain = mono_domain_get ();
1000 guint32 newsize = (stack->maximum << 1);
1001 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
1003 for (i=0; i < stack->maximum; i++) {
1004 gpointer frame = mono_array_get (stack->stack, gpointer, i);
1005 mono_array_setref (newstack, i, frame);
1007 stack->maximum = newsize;
1008 stack->stack = newstack;
1012 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
1014 MonoSecurityStack *ss = (MonoSecurityStack*) data;
1015 MonoJitInfo *ji = frame->ji;
1020 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
1021 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
1022 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
1023 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
1024 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
1025 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
1029 if (ss->skips > 0) {
1034 if (ss->count == ss->maximum)
1037 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
1039 /* continue down the stack */
1044 glist_to_array (GList *list, MonoClass *eclass)
1046 MonoDomain *domain = mono_domain_get ();
1053 len = g_list_length (list);
1054 res = mono_array_new (domain, eclass, len);
1056 for (i = 0; list; list = list->next, i++)
1057 mono_array_set (res, gpointer, i, list->data);
1063 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1064 * @skip: the number of stack frames to skip
1066 * This function returns an managed array of containing the security
1067 * informations for each frame (after the skipped ones). This is used for
1068 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1072 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1074 MonoSecurityStack ss;
1076 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1082 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1083 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1084 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1085 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1090 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1092 MonoClass *catch_class = ei->data.catch_class;
1093 MonoType *inflated_type;
1094 MonoGenericContext context;
1096 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1097 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1100 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1102 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1104 /* FIXME: we shouldn't inflate but instead put the
1105 type in the rgctx and fetch it from there. It
1106 might be a good idea to do this lazily, i.e. only
1107 when the exception is actually thrown, so as not to
1108 waste space for exception clauses which might never
1110 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1111 catch_class = mono_class_from_mono_type (inflated_type);
1112 mono_metadata_free_type (inflated_type);
1118 * mini_jit_info_table_find:
1120 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1121 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1122 * OUT_DOMAIN if it is not NULL.
1125 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1128 MonoInternalThread *t = mono_thread_internal_current ();
1134 ji = mono_jit_info_table_find (domain, addr);
1137 *out_domain = domain;
1141 /* maybe it is shared code, so we also search in the root domain */
1142 if (domain != mono_get_root_domain ()) {
1143 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1146 *out_domain = mono_get_root_domain ();
1151 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1152 for (; refs && *refs; refs++) {
1153 if (*refs != domain && *refs != mono_get_root_domain ()) {
1154 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1157 *out_domain = (MonoDomain*) *refs;
1167 * wrap_non_exception_throws:
1169 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1170 * WrapNonExceptionThrows flag set.
1173 wrap_non_exception_throws (MonoMethod *m)
1175 MonoAssembly *ass = m->klass->image->assembly;
1176 MonoCustomAttrInfo* attrs;
1177 static MonoClass *klass;
1179 gboolean val = FALSE;
1182 if (ass->wrap_non_exception_throws_inited)
1183 return ass->wrap_non_exception_throws;
1185 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1187 attrs = mono_custom_attrs_from_assembly (ass);
1189 for (i = 0; i < attrs->num_attrs; ++i) {
1190 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1192 int len, num_named, named_type, data_type, name_len;
1195 if (!attr->ctor || attr->ctor->klass != klass)
1197 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1198 len = attr->data_size;
1199 p = (const char*)attr->data;
1200 g_assert (read16 (p) == 0x0001);
1202 num_named = read16 (p);
1211 if (named_type != 0x54)
1213 name_len = mono_metadata_decode_blob_size (p, &p);
1214 name = g_malloc (name_len + 1);
1215 memcpy (name, p, name_len);
1216 name [name_len] = 0;
1218 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1220 /* The value is a BOOLEAN */
1223 mono_custom_attrs_free (attrs);
1226 ass->wrap_non_exception_throws = val;
1227 mono_memory_barrier ();
1228 ass->wrap_non_exception_throws_inited = TRUE;
1233 #ifndef MONO_ARCH_STACK_GROWS_UP
1234 #define DOES_STACK_GROWS_UP 1
1236 #define DOES_STACK_GROWS_UP 0
1239 #define MAX_UNMANAGED_BACKTRACE 128
1241 build_native_trace (void)
1243 /* This puppy only makes sense on mobile, IOW, ARM. */
1244 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1246 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1247 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1252 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1254 for (i = 0; i < size; i++)
1255 mono_array_set (res, gpointer, i, native_trace [i]);
1262 #define setup_managed_stacktrace_information() do { \
1263 if (mono_ex && !initial_trace_ips) { \
1264 trace_ips = g_list_reverse (trace_ips); \
1265 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1266 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1267 if (has_dynamic_methods) \
1268 /* These methods could go away anytime, so compute the stack trace now */ \
1269 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1271 g_list_free (trace_ips); \
1275 * mono_handle_exception_internal_first_pass:
1277 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1278 * OBJ is found. Run the index of the filter clause which caught the exception into
1279 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1282 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoObject *non_exception)
1284 MonoDomain *domain = mono_domain_get ();
1286 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1287 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1288 MonoLMF *lmf = mono_get_lmf ();
1289 MonoArray *initial_trace_ips = NULL;
1290 GList *trace_ips = NULL;
1291 MonoException *mono_ex;
1292 gboolean stack_overflow = FALSE;
1293 MonoContext initial_ctx;
1294 int frame_count = 0;
1295 gboolean has_dynamic_methods = FALSE;
1300 g_assert (ctx != NULL);
1302 if (obj == domain->stack_overflow_ex)
1303 stack_overflow = TRUE;
1305 mono_ex = (MonoException*)obj;
1306 initial_trace_ips = mono_ex->trace_ips;
1308 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1309 mono_ex = (MonoException*)obj;
1310 initial_trace_ips = mono_ex->trace_ips;
1316 call_filter = mono_get_call_filter ();
1318 g_assert (jit_tls->end_of_stack);
1319 g_assert (jit_tls->abort_func);
1322 *out_filter_idx = -1;
1329 MonoContext new_ctx;
1331 int clause_index_start = 0;
1332 gboolean unwind_res = TRUE;
1334 StackFrameInfo frame;
1336 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1338 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1342 g_assert (frame.type == FRAME_TYPE_MANAGED);
1347 setup_managed_stacktrace_information ();
1352 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1354 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1355 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1356 "The native frame called the managed method:\n%s\n",
1357 mono_method_full_name (ji->method, TRUE));
1360 if (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1362 * Avoid overwriting the stack trace if the exception is
1363 * rethrown. Also avoid giant stack traces during a stack
1366 if (!initial_trace_ips && (frame_count < 1000)) {
1367 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1368 trace_ips = g_list_prepend (trace_ips,
1369 get_generic_info_from_stack_frame (ji, ctx));
1373 if (ji->method->dynamic)
1374 has_dynamic_methods = TRUE;
1376 if (stack_overflow) {
1377 if (DOES_STACK_GROWS_UP)
1378 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1380 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1382 free_stack = 0xffffff;
1385 for (i = clause_index_start; i < ji->num_clauses; i++) {
1386 MonoJitExceptionInfo *ei = &ji->clauses [i];
1387 gboolean filtered = FALSE;
1390 * During stack overflow, wait till the unwinding frees some stack
1391 * space before running handlers/finalizers.
1393 if (free_stack <= (64 * 1024))
1396 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1398 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1401 * Have to unwrap RuntimeWrappedExceptions if the
1402 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1404 if (non_exception && !wrap_non_exception_throws (ji->method))
1405 ex_obj = non_exception;
1409 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1410 gboolean is_user_frame = ji->method->wrapper_type == MONO_WRAPPER_NONE || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1411 #ifndef DISABLE_PERFCOUNTERS
1412 mono_perfcounters->exceptions_filters++;
1414 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1417 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1418 trim the stackframe since if it returns FALSE we lose information.
1420 FIXME Not 100% sure if it's a good idea even with user clauses.
1423 setup_managed_stacktrace_information ();
1425 if (ji->from_llvm) {
1426 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1427 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1429 g_assert_not_reached ();
1432 /* store the exception object in bp + ei->exvar_offset */
1433 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1436 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1437 filtered = call_filter (ctx, ei->data.filter);
1438 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1439 if (filtered && out_filter_idx)
1440 *out_filter_idx = filter_idx;
1447 setup_managed_stacktrace_information ();
1448 /* mono_debugger_agent_handle_exception () needs this */
1449 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1454 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1455 setup_managed_stacktrace_information ();
1460 /* mono_debugger_agent_handle_exception () needs this */
1461 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1470 g_assert_not_reached ();
1474 * mono_handle_exception_internal:
1475 * @ctx: saved processor state
1476 * @obj: the exception object
1477 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1480 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1482 MonoDomain *domain = mono_domain_get ();
1484 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1485 static void (*restore_context) (void *);
1486 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1487 MonoLMF *lmf = mono_get_lmf ();
1488 MonoException *mono_ex;
1489 gboolean stack_overflow = FALSE;
1490 MonoContext initial_ctx;
1491 int frame_count = 0;
1492 gint32 filter_idx, first_filter_idx;
1495 MonoObject *non_exception = NULL;
1497 g_assert (ctx != NULL);
1499 MonoException *ex = mono_get_exception_null_reference ();
1500 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1501 obj = (MonoObject *)ex;
1505 * Allocate a new exception object instead of the preconstructed ones.
1507 if (obj == domain->stack_overflow_ex) {
1509 * It is not a good idea to try and put even more pressure on the little stack available.
1510 * obj = mono_get_exception_stack_overflow ();
1512 stack_overflow = TRUE;
1514 else if (obj == domain->null_reference_ex) {
1515 obj = mono_get_exception_null_reference ();
1518 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1519 non_exception = obj;
1520 obj = mono_get_exception_runtime_wrapped (obj);
1523 mono_ex = (MonoException*)obj;
1525 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1526 mono_ex = (MonoException*)obj;
1531 if (mono_ex && jit_tls->class_cast_from) {
1532 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1533 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1534 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1535 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1536 mono_ex->message = mono_string_new (domain, msg);
1541 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1542 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1543 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1544 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1545 mono_ex->message = mono_string_new (domain, msg);
1553 call_filter = mono_get_call_filter ();
1555 if (!restore_context)
1556 restore_context = mono_get_restore_context ();
1558 g_assert (jit_tls->end_of_stack);
1559 g_assert (jit_tls->abort_func);
1562 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1563 * end up being TRUE on any code path.
1565 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1570 MonoContext ctx_cp = *ctx;
1571 if (mono_trace_is_enabled ()) {
1572 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1573 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1574 MonoObject *message;
1575 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1577 MonoObject *exc = NULL;
1578 if (get_message == NULL) {
1580 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1582 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1584 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1588 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1590 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1592 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1593 mono_print_thread_dump_from_ctx (ctx);
1595 jit_tls->orig_ex_ctx_set = TRUE;
1596 mono_profiler_exception_thrown (obj);
1597 jit_tls->orig_ex_ctx_set = FALSE;
1599 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, non_exception);
1602 if (mini_get_debug_options ()->break_on_exc)
1604 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1606 if (mini_get_debug_options ()->suspend_on_unhandled) {
1607 mono_runtime_printf_err ("Unhandled exception, suspending...");
1612 // FIXME: This runs managed code so it might cause another stack overflow when
1613 // we are handling a stack overflow
1614 mono_unhandled_exception (obj);
1617 // Treat exceptions that are "handled" by mono_runtime_invoke() as unhandled.
1620 if (ji && ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)
1621 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1623 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1633 MonoContext new_ctx;
1635 int clause_index_start = 0;
1636 gboolean unwind_res = TRUE;
1640 ji = jit_tls->resume_state.ji;
1641 new_ctx = jit_tls->resume_state.new_ctx;
1642 clause_index_start = jit_tls->resume_state.clause_index;
1643 lmf = jit_tls->resume_state.lmf;
1644 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1645 filter_idx = jit_tls->resume_state.filter_idx;
1647 StackFrameInfo frame;
1649 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1651 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1655 g_assert (frame.type == FRAME_TYPE_MANAGED);
1661 *(mono_get_lmf_addr ()) = lmf;
1663 jit_tls->abort_func (obj);
1664 g_assert_not_reached ();
1668 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1670 if (stack_overflow) {
1671 if (DOES_STACK_GROWS_UP)
1672 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1674 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1676 free_stack = 0xffffff;
1679 for (i = clause_index_start; i < ji->num_clauses; i++) {
1680 MonoJitExceptionInfo *ei = &ji->clauses [i];
1681 gboolean filtered = FALSE;
1684 * During stack overflow, wait till the unwinding frees some stack
1685 * space before running handlers/finalizers.
1687 if (free_stack <= (64 * 1024))
1690 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1692 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1695 * Have to unwrap RuntimeWrappedExceptions if the
1696 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1698 if (non_exception && !wrap_non_exception_throws (ji->method))
1699 ex_obj = non_exception;
1703 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1704 if (ji->from_llvm) {
1705 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1706 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1708 g_assert_not_reached ();
1711 /* store the exception object in bp + ei->exvar_offset */
1712 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1716 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1718 * Filter clauses should only be run in the
1719 * first pass of exception handling.
1721 filtered = (filter_idx == first_filter_idx);
1725 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1726 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1728 * This guards against the situation that we abort a thread that is executing a finally clause
1729 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1730 * check for this situation here and resume interruption if we are below the guarded block.
1732 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1733 gboolean is_outside = FALSE;
1734 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1735 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1736 //FIXME make this stack direction aware
1737 if (catch_bp > prot_bp) {
1739 } else if (catch_bp == prot_bp) {
1740 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1741 * So we check if the catch handler_start is protected by the guarded handler protected region
1744 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1745 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1746 * There aren't any further finally/fault handler blocks down the stack over this exception.
1747 * This must be ensured by the code that installs the guard trampoline.
1749 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1751 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1756 jit_tls->handler_block_return_address = NULL;
1757 jit_tls->handler_block = NULL;
1758 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1762 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1763 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1764 jit_tls->orig_ex_ctx_set = TRUE;
1765 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1766 jit_tls->orig_ex_ctx_set = FALSE;
1767 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1768 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1769 *(mono_get_lmf_addr ()) = lmf;
1770 #ifndef DISABLE_PERFCOUNTERS
1771 mono_perfcounters->exceptions_depth += frame_count;
1773 if (obj == domain->stack_overflow_ex)
1774 jit_tls->handling_stack_ovf = FALSE;
1778 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1779 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1780 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1781 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1782 jit_tls->orig_ex_ctx_set = TRUE;
1783 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1784 jit_tls->orig_ex_ctx_set = FALSE;
1785 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1786 call_filter (ctx, ei->handler_start);
1788 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1789 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1790 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1791 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1792 jit_tls->orig_ex_ctx_set = TRUE;
1793 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1794 jit_tls->orig_ex_ctx_set = FALSE;
1795 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1796 #ifndef DISABLE_PERFCOUNTERS
1797 mono_perfcounters->exceptions_finallys++;
1799 *(mono_get_lmf_addr ()) = lmf;
1800 if (ji->from_llvm) {
1802 * LLVM compiled finally handlers follow the design
1803 * of the c++ ehabi, i.e. they call a resume function
1804 * at the end instead of returning to the caller.
1805 * So save the exception handling state,
1806 * mono_resume_unwind () will call us again to continue
1809 jit_tls->resume_state.ex_obj = obj;
1810 jit_tls->resume_state.ji = ji;
1811 jit_tls->resume_state.clause_index = i + 1;
1812 jit_tls->resume_state.ctx = *ctx;
1813 jit_tls->resume_state.new_ctx = new_ctx;
1814 jit_tls->resume_state.lmf = lmf;
1815 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1816 jit_tls->resume_state.filter_idx = filter_idx;
1817 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1820 call_filter (ctx, ei->handler_start);
1826 jit_tls->orig_ex_ctx_set = TRUE;
1827 mono_profiler_exception_method_leave (ji->method);
1828 jit_tls->orig_ex_ctx_set = FALSE;
1833 g_assert_not_reached ();
1837 * mono_debugger_handle_exception:
1839 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1840 * at the exception and FALSE to resume with the normal exception handling.
1842 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1843 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1844 * `callq throw' instruction.
1847 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1849 MonoDebuggerExceptionAction action;
1851 if (!mono_debug_using_mono_debugger ())
1855 MonoException *ex = mono_get_exception_null_reference ();
1856 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1857 obj = (MonoObject *)ex;
1860 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1862 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1864 * The debugger wants us to stop on the `throw' instruction.
1865 * By the time we get here, it already inserted a breakpoint there.
1868 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1869 MonoContext ctx_cp = *ctx;
1870 MonoJitInfo *ji = NULL;
1874 * The debugger wants us to stop only if this exception is user-unhandled.
1877 ret = mono_handle_exception_internal_first_pass (&ctx_cp, obj, NULL, &ji, NULL);
1878 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1880 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1881 * inside the method being invoked, so we handle it like a user-unhandled exception.
1888 * The exception is user-unhandled - tell the debugger to stop.
1890 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1894 * The exception is catched somewhere - resume with the normal exception handling and don't
1895 * stop in the debugger.
1903 * mono_debugger_run_finally:
1904 * @start_ctx: saved processor state
1906 * This method is called by the Mono Debugger to call all `finally' clauses of the
1907 * current stack frame. It's used when the user issues a `return' command to make
1908 * the current stack frame return. After returning from this method, the debugger
1909 * unwinds the stack one frame and gives control back to the user.
1911 * NOTE: This method is only used when running inside the Mono Debugger.
1914 mono_debugger_run_finally (MonoContext *start_ctx)
1916 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1917 MonoDomain *domain = mono_domain_get ();
1918 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1919 MonoLMF *lmf = mono_get_lmf ();
1920 MonoContext ctx, new_ctx;
1921 MonoJitInfo *ji, rji;
1926 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1927 if (!ji || ji == (gpointer)-1)
1931 call_filter = mono_get_call_filter ();
1933 for (i = 0; i < ji->num_clauses; i++) {
1934 MonoJitExceptionInfo *ei = &ji->clauses [i];
1936 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1937 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1938 call_filter (&ctx, ei->handler_start);
1944 * mono_handle_exception:
1945 * @ctx: saved processor state
1946 * @obj: the exception object
1949 mono_handle_exception (MonoContext *ctx, gpointer obj)
1951 #ifndef DISABLE_PERFCOUNTERS
1952 mono_perfcounters->exceptions_thrown++;
1955 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1958 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1960 #ifndef MONO_ARCH_USE_SIGACTION
1961 #error "Can't use sigaltstack without sigaction"
1964 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1967 mono_setup_altstack (MonoJitTlsData *tls)
1971 guint8 *staddr = NULL;
1973 if (mono_running_on_valgrind ())
1976 mono_thread_get_stack_bounds (&staddr, &stsize);
1980 tls->end_of_stack = staddr + stsize;
1981 tls->stack_size = stsize;
1983 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1985 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1986 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1988 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1990 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1991 /* mprotect can fail for the main thread stack */
1992 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);
1993 g_assert (gaddr == tls->stack_ovf_guard_base);
1994 tls->stack_ovf_valloced = TRUE;
1997 /* Setup an alternate signal stack */
1998 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1999 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2001 g_assert (tls->signal_stack);
2003 sa.ss_sp = tls->signal_stack;
2004 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2006 g_assert (sigaltstack (&sa, NULL) == 0);
2008 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);
2012 mono_free_altstack (MonoJitTlsData *tls)
2017 sa.ss_sp = tls->signal_stack;
2018 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2019 sa.ss_flags = SS_DISABLE;
2020 err = sigaltstack (&sa, NULL);
2021 g_assert (err == 0);
2023 if (tls->signal_stack)
2024 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
2025 if (tls->stack_ovf_valloced)
2026 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
2028 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2031 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2034 mono_setup_altstack (MonoJitTlsData *tls)
2039 mono_free_altstack (MonoJitTlsData *tls)
2043 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2046 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2048 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2049 /* we need to leave some room for throwing the exception */
2050 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2051 unprotect_size -= mono_pagesize ();
2052 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2053 * is sufficient stack
2055 //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);
2057 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2058 return unprotect_size == jit_tls->stack_ovf_guard_size;
2061 static G_GNUC_UNUSED void
2062 try_more_restore (void)
2064 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2065 if (try_restore_stack_protection (jit_tls, 500))
2066 jit_tls->restore_stack_prot = NULL;
2069 static G_GNUC_UNUSED void
2070 restore_stack_protection (void)
2072 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2073 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2074 /* if we can't restore the stack protection, keep a callback installed so
2075 * we'll try to restore as much stack as we can at each return from unmanaged
2078 if (try_restore_stack_protection (jit_tls, 4096))
2079 jit_tls->restore_stack_prot = NULL;
2081 jit_tls->restore_stack_prot = try_more_restore_tramp;
2082 /* here we also throw a stack overflow exception */
2083 ex->trace_ips = NULL;
2084 ex->stack_trace = NULL;
2085 mono_raise_exception (ex);
2089 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2091 void (*func)(void) = (gpointer)tramp_data;
2097 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2099 /* we got a stack overflow in the soft-guard pages
2100 * There are two cases:
2101 * 1) managed code caused the overflow: we unprotect the soft-guard page
2102 * and let the arch-specific code trigger the exception handling mechanism
2103 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2104 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2105 * and hope we can continue with those enabled, at least until the hard-guard page
2106 * is hit. The alternative to continuing here is to just print a message and abort.
2107 * We may add in the future the code to protect the pages again in the codepath
2108 * when we return from unmanaged to managed code.
2110 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2111 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2112 /* we unprotect the minimum amount we can */
2114 gboolean handled = FALSE;
2116 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2117 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2118 guard_size -= mono_pagesize ();
2120 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2121 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2122 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);
2123 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2125 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
2130 /* We print a message: after this even managed stack overflows
2131 * may crash the runtime
2133 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2134 if (!jit_tls->handling_stack_ovf) {
2135 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2136 jit_tls->handling_stack_ovf = 1;
2138 /*fprintf (stderr, "Already handling stack overflow\n");*/
2147 MonoMethod *omethod;
2149 } PrintOverflowUserData;
2152 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2154 MonoMethod *method = NULL;
2155 PrintOverflowUserData *user_data = data;
2159 method = frame->ji->method;
2162 if (user_data->count == 0) {
2163 /* The first frame is in its prolog, so a line number cannot be computed */
2164 user_data->count ++;
2168 /* If this is a one method overflow, skip the other instances */
2169 if (method == user_data->omethod)
2172 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2173 mono_runtime_printf_err (" %s", location);
2176 if (user_data->count == 1) {
2177 mono_runtime_printf_err (" <...>");
2178 user_data->omethod = method;
2180 user_data->omethod = NULL;
2183 user_data->count ++;
2185 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2191 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2193 PrintOverflowUserData ud;
2196 /* we don't do much now, but we can warn the user with a useful message */
2197 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2199 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2200 mono_arch_sigctx_to_monoctx (ctx, &mctx);
2202 mono_runtime_printf_err ("Stacktrace:");
2204 memset (&ud, 0, sizeof (ud));
2206 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2208 if (ji && ji->method)
2209 mono_runtime_printf_err ("At %s", mono_method_full_name (ji->method, TRUE));
2211 mono_runtime_printf_err ("At <unmanaged>.");
2218 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2220 MonoMethod *method = NULL;
2222 method = frame->ji->method;
2225 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2226 mono_runtime_printf_err (" %s", location);
2229 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2234 static G_GNUC_UNUSED gboolean
2235 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2237 GString *p = (GString*)data;
2238 MonoMethod *method = NULL;
2240 method = frame->ji->method;
2243 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2244 g_string_append_printf (p, " %s\n", location);
2247 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2252 static gboolean handling_sigsegv = FALSE;
2255 * mono_handle_native_sigsegv:
2257 * Handle a SIGSEGV received while in native code by printing diagnostic
2258 * information and aborting.
2261 mono_handle_native_sigsegv (int signal, void *ctx)
2263 #ifdef MONO_ARCH_USE_SIGACTION
2264 struct sigaction sa;
2266 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2267 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2269 if (handling_sigsegv)
2272 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2273 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2278 /* To prevent infinite loops when the stack walk causes a crash */
2279 handling_sigsegv = TRUE;
2281 /* !jit_tls means the thread was not registered with the runtime */
2282 if (jit_tls && mono_thread_internal_current ()) {
2283 mono_runtime_printf_err ("Stacktrace:\n");
2285 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2288 #ifdef HAVE_BACKTRACE_SYMBOLS
2294 mono_runtime_printf_err ("\nNative stacktrace:\n");
2296 size = backtrace (array, 256);
2297 names = backtrace_symbols (array, size);
2298 for (i =0; i < size; ++i) {
2299 mono_runtime_printf_err ("\t%s", names [i]);
2303 /* Try to get more meaningful information using gdb */
2305 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2306 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
2307 /* From g_spawn_command_line_sync () in eglib */
2310 pid_t crashed_pid = getpid ();
2314 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2315 * it will deadlock. Call the syscall directly instead.
2317 pid = mono_runtime_syscall_fork ();
2320 dup2 (STDERR_FILENO, STDOUT_FILENO);
2322 mono_gdb_render_native_backtraces (crashed_pid);
2326 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2327 waitpid (pid, &status, 0);
2334 * A SIGSEGV indicates something went very wrong so we can no longer depend
2335 * on anything working. So try to print out lots of diagnostics, starting
2336 * with ones which have a greater chance of working.
2338 mono_runtime_printf_err (
2340 "=================================================================\n"
2341 "Got a %s while executing native code. This usually indicates\n"
2342 "a fatal error in the mono runtime or one of the native libraries \n"
2343 "used by your application.\n"
2344 "=================================================================\n",
2348 #ifdef MONO_ARCH_USE_SIGACTION
2350 /* Remove our SIGABRT handler */
2351 sa.sa_handler = SIG_DFL;
2352 sigemptyset (&sa.sa_mask);
2355 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2359 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2360 #if defined (PLATFORM_ANDROID)
2368 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2370 MonoInternalThread *thread = mono_thread_internal_current ();
2371 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2374 GString* text = g_string_new (0);
2375 char *name, *wapi_desc;
2376 GError *error = NULL;
2379 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2381 g_string_append_printf (text, "\n\"%s\"", name);
2384 else if (thread->threadpool_thread)
2385 g_string_append (text, "\n\"<threadpool thread>\"");
2387 g_string_append (text, "\n\"<unnamed thread>\"");
2390 wapi_desc = wapi_current_thread_desc ();
2391 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2395 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2397 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2399 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2401 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2403 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2405 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2408 mono_runtime_printf ("%s", text->str);
2410 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2411 OutputDebugStringA(text->str);
2414 g_string_free (text, TRUE);
2415 mono_runtime_stdout_fflush ();
2419 * mono_print_thread_dump:
2421 * Print information about the current thread to stdout.
2422 * SIGCTX can be NULL, allowing this to be called from gdb.
2425 mono_print_thread_dump (void *sigctx)
2427 mono_print_thread_dump_internal (sigctx, NULL);
2431 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2433 mono_print_thread_dump_internal (NULL, ctx);
2437 * mono_resume_unwind:
2439 * This is called by a trampoline from LLVM compiled finally clauses to continue
2443 mono_resume_unwind (MonoContext *ctx)
2445 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2446 static void (*restore_context) (MonoContext *);
2447 MonoContext new_ctx;
2449 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2450 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2453 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2455 if (!restore_context)
2456 restore_context = mono_get_restore_context ();
2458 restore_context (&new_ctx);
2461 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2466 MonoJitExceptionInfo *ei;
2467 } FindHandlerBlockData;
2470 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2474 FindHandlerBlockData *pdata = data;
2475 MonoJitInfo *ji = frame->ji;
2480 if (ji->method->wrapper_type)
2483 ip = MONO_CONTEXT_GET_IP (ctx);
2485 for (i = 0; i < ji->num_clauses; ++i) {
2486 MonoJitExceptionInfo *ei = ji->clauses + i;
2487 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2489 /*If ip points to the first instruction it means the handler block didn't start
2490 so we can leave its execution to the EH machinery*/
2491 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2503 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2506 MonoJitExceptionInfo *clause = NULL;
2509 ip = MONO_CONTEXT_GET_IP (ctx);
2511 for (i = 0; i < ji->num_clauses; ++i) {
2512 clause = &ji->clauses [i];
2513 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2515 if (clause->handler_start < ip && clause->data.handler_end > ip)
2519 /*no matching finally */
2520 if (i == ji->num_clauses)
2523 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2524 if (ip == clause->handler_start)
2527 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2531 * Finds the bottom handler block running and install a block guard if needed.
2532 * FIXME add full-aot support.
2535 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2537 FindHandlerBlockData data = { 0 };
2538 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2545 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2546 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2548 if (!jit_tls || jit_tls->handler_block_return_address)
2551 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_SIGNAL_SAFE, &data);
2556 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2558 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2559 if (resume_ip == NULL)
2562 jit_tls->handler_block_return_address = resume_ip;
2563 jit_tls->handler_block = data.ei;
2570 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2578 mono_set_cast_details (MonoClass *from, MonoClass *to)
2580 MonoJitTlsData *jit_tls = NULL;
2582 if (mini_get_debug_options ()->better_cast_details) {
2583 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2584 jit_tls->class_cast_from = from;
2585 jit_tls->class_cast_to = to;
2590 /*returns false if the thread is not attached*/
2592 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2594 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2595 MonoInternalThread *thread = mono_thread_internal_current ();
2596 if (!thread || !thread->jit_data) {
2602 mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx);
2604 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2605 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2607 g_error ("Use a null sigctx requires a working mono-context");
2610 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2611 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2612 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2616 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2622 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2624 MonoInternalThread *thread = mono_thread_internal_current ();
2625 if (!thread || !thread->jit_data) {
2631 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2632 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2633 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2638 /*returns false if the thread is not attached*/
2640 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2642 MonoInternalThread *thread = mono_thread_internal_current ();
2643 MONO_ARCH_CONTEXT_DEF
2645 mono_arch_flush_register_windows ();
2647 if (!thread || !thread->jit_data) {
2651 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2652 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2654 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2657 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2658 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2659 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2665 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2667 void (*restore_context) (MonoContext *);
2668 restore_context = mono_get_restore_context ();
2670 mono_handle_exception (ctx, exc);
2671 restore_context (ctx);
2674 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2676 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2678 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2679 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2680 jit_tls->ex_ctx = *ctx;
2682 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2684 g_error ("This target doesn't support mono_arch_setup_async_callback");
2689 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2691 unhandled_exception_hook = func;
2692 unhandled_exception_hook_data = user_data;
2696 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2698 if (unhandled_exception_hook) {
2699 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2701 MonoObject *other = NULL;
2702 MonoString *str = mono_object_to_string (exc, &other);
2706 msg = mono_string_to_utf8 (str);
2708 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2709 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2711 #if defined(__APPLE__) && defined(__arm__)
2712 g_assertion_message ("Terminating runtime due to unhandled exception");
2714 exit (mono_environment_exitcode_get ());
2718 g_assert_not_reached ();