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>
52 #include "debug-mini.h"
54 #include "debugger-agent.h"
56 #ifndef MONO_ARCH_CONTEXT_DEF
57 #define MONO_ARCH_CONTEXT_DEF
60 static gpointer restore_context_func, call_filter_func;
61 static gpointer throw_exception_func, rethrow_exception_func;
62 static gpointer throw_corlib_exception_func;
64 static gpointer try_more_restore_tramp = NULL;
65 static gpointer restore_stack_protection_tramp = NULL;
67 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
68 static gpointer unhandled_exception_hook_data = NULL;
70 static void try_more_restore (void);
71 static void restore_stack_protection (void);
72 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
73 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
74 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
77 mono_exceptions_init (void)
79 MonoRuntimeExceptionHandlingCallbacks cbs;
81 restore_context_func = mono_aot_get_trampoline ("restore_context");
82 call_filter_func = mono_aot_get_trampoline ("call_filter");
83 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
84 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
88 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
90 mono_save_trampoline_xdebug_info (info);
91 mono_tramp_info_free (info);
93 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
95 mono_save_trampoline_xdebug_info (info);
96 mono_tramp_info_free (info);
98 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
100 mono_save_trampoline_xdebug_info (info);
101 mono_tramp_info_free (info);
103 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
105 mono_save_trampoline_xdebug_info (info);
106 mono_tramp_info_free (info);
109 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
110 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
111 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
114 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
115 mono_arch_exceptions_init ();
117 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
118 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
119 cbs.mono_raise_exception = mono_get_throw_exception ();
120 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
121 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
122 mono_install_eh_callbacks (&cbs);
126 mono_get_throw_exception (void)
128 g_assert (throw_exception_func);
129 return throw_exception_func;
133 mono_get_rethrow_exception (void)
135 g_assert (rethrow_exception_func);
136 return rethrow_exception_func;
140 mono_get_call_filter (void)
142 g_assert (call_filter_func);
143 return call_filter_func;
147 mono_get_restore_context (void)
149 g_assert (restore_context_func);
150 return restore_context_func;
154 mono_get_throw_corlib_exception (void)
156 gpointer code = NULL;
159 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
160 if (throw_corlib_exception_func)
161 return throw_corlib_exception_func;
164 code = mono_aot_get_trampoline ("throw_corlib_exception");
166 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
168 mono_save_trampoline_xdebug_info (info);
169 mono_tramp_info_free (info);
173 mono_memory_barrier ();
175 throw_corlib_exception_func = code;
177 return throw_corlib_exception_func;
181 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
183 MonoTryBlockHoleTableJitInfo *table;
188 if (ei->try_start > ip || ip >= ei->try_end)
191 if (!ji->has_try_block_holes)
194 table = mono_jit_info_get_try_block_hole_table_info (ji);
195 offset = (guint32)((char*)ip - (char*)ji->code_start);
196 clause = (guint16)(ei - ji->clauses);
197 g_assert (clause < ji->num_clauses);
199 for (i = 0; i < table->num_holes; ++i) {
200 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
201 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
210 * Translate between the mono_arch_find_jit_info function and the old API.
213 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
214 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
216 StackFrameInfo frame;
219 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
221 /* Avoid costly table lookup during stack overflow */
222 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
225 ji = mini_jit_info_table_find (domain, ip, NULL);
230 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
234 /* Convert between the new and the old APIs */
235 switch (frame.type) {
236 case FRAME_TYPE_MANAGED:
240 case FRAME_TYPE_MANAGED_TO_NATIVE:
244 memset (res, 0, sizeof (MonoJitInfo));
245 res->method = frame.method;
248 case FRAME_TYPE_DEBUGGER_INVOKE: {
252 * The normal exception handling code can't handle this frame, so just
255 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
256 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
260 g_assert_not_reached ();
265 /* mono_find_jit_info:
267 * This function is used to gather information from @ctx. It return the
268 * MonoJitInfo of the corresponding function, unwinds one stack frame and
269 * stores the resulting context into @new_ctx. It also stores a string
270 * describing the stack location into @trace (if not NULL), and modifies
271 * the @lmf if necessary. @native_offset return the IP offset from the
272 * start of the function or -1 if that info is not available.
275 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
276 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
280 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
292 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
294 if (ji == (gpointer)-1)
297 if (managed2 || (ji && ji->method->wrapper_type)) {
298 const char *real_ip, *start;
301 start = (const char *)ji->code_start;
303 /* ctx->ip points into native code */
304 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
306 real_ip = (const char*)ip;
308 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
309 offset = real_ip - start;
314 *native_offset = offset;
317 if (!ji->method->wrapper_type || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
321 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
324 char *fname = mono_method_full_name (res->method, TRUE);
325 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
334 * mono_find_jit_info_ext:
336 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
338 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
339 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
340 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
341 * to obtain the last managed frame.
342 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
343 * On return, it will be filled with the locations where callee saved registers are saved
344 * by the current frame. This is returned outside of StackFrameInfo because it can be
345 * quite large on some platforms.
348 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
349 MonoJitInfo *prev_ji, MonoContext *ctx,
350 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
351 mgreg_t **save_locations,
352 StackFrameInfo *frame)
355 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
357 MonoDomain *target_domain;
362 /* Avoid costly table lookup during stack overflow */
363 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
366 ji = mini_jit_info_table_find (domain, ip, &target_domain);
369 target_domain = domain;
372 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
374 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
378 if (frame->type == FRAME_TYPE_MANAGED) {
379 if (!frame->ji->method->wrapper_type || frame->ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
380 frame->managed = TRUE;
383 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
385 * This type of frame is just a marker, the caller should unwind once more to get the
386 * last managed frame.
389 frame->method = NULL;
392 frame->native_offset = -1;
393 frame->domain = target_domain;
397 if (frame->type == FRAME_TYPE_MANAGED)
398 frame->method = ji->method;
400 if (ji && (frame->managed || ji->method->wrapper_type)) {
401 const char *real_ip, *start;
403 start = (const char *)ji->code_start;
405 /* ctx->ip points into native code */
406 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
408 real_ip = (const char*)ip;
410 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
411 frame->native_offset = real_ip - start;
413 frame->native_offset = -1;
416 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
418 if (trace && frame->method) {
419 char *fname = mono_method_full_name (frame->method, TRUE);
420 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
429 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
431 MonoGenericJitInfo *gi;
434 if (!ji->has_generic_jit_info)
436 gi = mono_jit_info_get_generic_jit_info (ji);
442 * Search location list if available, it contains the precise location of the
443 * argument for every pc offset, even if the method was interrupted while it was in
447 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
450 for (i = 0; i < gi->nlocs; ++i) {
451 MonoDwarfLocListEntry *entry = &gi->locations [i];
453 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
455 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
457 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
461 g_assert (i < gi->nlocs);
464 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
466 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
470 if (mono_method_get_context (ji->method)->method_inst) {
472 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
475 /* Avoid returning a managed object */
476 MonoObject *this_obj = info;
478 return this_obj->vtable->klass;
482 static MonoGenericContext
483 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
485 MonoGenericContext context = { NULL, NULL };
486 MonoClass *class, *method_container_class;
488 g_assert (generic_info);
490 g_assert (ji->method->is_inflated);
491 if (mono_method_get_context (ji->method)->method_inst) {
492 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
494 class = mrgctx->class_vtable->klass;
495 context.method_inst = mrgctx->method_inst;
496 g_assert (context.method_inst);
497 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
498 MonoVTable *vtable = generic_info;
500 class = vtable->klass;
502 class = generic_info;
505 //g_assert (!ji->method->klass->generic_container);
506 if (ji->method->klass->generic_class)
507 method_container_class = ji->method->klass->generic_class->container_class;
509 method_container_class = ji->method->klass;
511 /* class might refer to a subclass of ji->method's class */
512 while (!(class == ji->method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
513 class = class->parent;
517 if (class->generic_class || class->generic_container)
518 context.class_inst = mini_class_get_context (class)->class_inst;
520 if (class->generic_class)
521 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
523 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
529 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
531 MonoGenericContext context;
534 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
536 context = get_generic_context_from_stack_frame (ji, generic_info);
538 method = mono_method_get_declaring_generic_method (ji->method);
539 method = mono_class_inflate_generic_method (method, &context);
545 ves_icall_System_Exception_get_trace (MonoException *ex)
547 MonoDomain *domain = mono_domain_get ();
549 MonoArray *ta = ex->trace_ips;
554 /* Exception is not thrown yet */
557 len = mono_array_length (ta) >> 1;
558 trace_str = g_string_new ("");
559 for (i = 0; i < len; i++) {
561 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
562 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
564 ji = mono_jit_info_table_find (domain, ip);
566 /* Unmanaged frame */
567 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
571 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
573 address = (char *)ip - (char *)ji->code_start;
574 location = mono_debug_print_stack_frame (
575 method, address, ex->object.vtable->domain);
577 g_string_append_printf (trace_str, "%s\n", location);
582 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
583 g_string_free (trace_str, TRUE);
589 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
591 MonoDomain *domain = mono_domain_get ();
593 MonoArray *ta = exc->trace_ips;
594 MonoDebugSourceLocation *location;
598 /* Exception is not thrown yet */
599 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
602 len = mono_array_length (ta) >> 1;
604 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
606 for (i = skip; i < len; i++) {
608 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
609 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
610 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
613 ji = mono_jit_info_table_find (domain, ip);
615 /* Unmanaged frame */
616 mono_array_setref (res, i, sf);
620 g_assert (ji != NULL);
622 method = get_method_from_stack_frame (ji, generic_info);
623 if (ji->method->wrapper_type) {
627 s = mono_method_full_name (method, TRUE);
628 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
632 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
633 sf->native_offset = (char *)ip - (char *)ji->code_start;
636 * mono_debug_lookup_source_location() returns both the file / line number information
637 * and the IL offset. Note that computing the IL offset is already an expensive
638 * operation, so we shouldn't call this method twice.
640 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
642 sf->il_offset = location->il_offset;
646 if (need_file_info) {
647 if (location && location->source_file) {
648 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
649 sf->line = location->row;
650 sf->column = location->column;
652 sf->line = sf->column = 0;
657 mono_debug_free_source_location (location);
658 mono_array_setref (res, i, sf);
665 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
668 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
669 if (jit_tls && jit_tls->orig_ex_ctx_set)
670 start_ctx = &jit_tls->orig_ex_ctx;
672 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
675 * mono_walk_stack_with_ctx:
677 * Unwind the current thread starting at @start_ctx.
679 * If @start_ctx is null, we capture the current context.
682 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
684 MonoContext extra_ctx;
685 MonoInternalThread *thread = mono_thread_internal_current ();
686 MONO_ARCH_CONTEXT_DEF
688 if (!thread || !thread->jit_data)
692 mono_arch_flush_register_windows ();
694 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
695 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
697 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
699 start_ctx = &extra_ctx;
702 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
706 * mono_walk_stack_with_state:
708 * Unwind a thread described by @state.
710 * State must be valid (state->valid == TRUE).
712 * If you are using this function to unwind another thread, make sure it is suspended.
714 * If @state is null, we capture the current context.
717 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
719 MonoThreadUnwindState extra_state;
721 if (!mono_thread_state_init_from_current (&extra_state))
723 state = &extra_state;
726 g_assert (state->valid);
728 mono_walk_stack_full (func,
730 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
731 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
732 state->unwind_data [MONO_UNWIND_DATA_LMF],
733 unwind_options, user_data);
737 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
739 MonoThreadUnwindState state;
740 if (!mono_thread_state_init_from_current (&state))
742 mono_walk_stack_with_state (func, &state, options, user_data);
746 * mono_walk_stack_full:
747 * @func: callback to call for each stack frame
748 * @domain: starting appdomain, can be NULL to use the current domain
749 * @unwind_options: what extra information the unwinder should gather
750 * @start_ctx: starting state of the stack walk, can be NULL.
751 * @thread: the thread whose stack to walk, can be NULL to use the current thread
752 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
753 * @user_data: data passed to the callback
755 * This function walks the stack of a thread, starting from the state
756 * represented by start_ctx. For each frame the callback
757 * function is called with the relevant info. The walk ends when no more
758 * managed stack frames are found or when the callback returns a TRUE value.
761 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
764 MonoContext ctx, new_ctx;
765 StackFrameInfo frame;
767 mgreg_t *reg_locations [MONO_MAX_IREGS];
768 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
769 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
771 g_assert (start_ctx);
774 /*The LMF will be null if the target have no managed frames.*/
775 /* g_assert (lmf); */
777 memcpy (&ctx, start_ctx, sizeof (MonoContext));
778 memset (reg_locations, 0, sizeof (reg_locations));
780 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
782 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
786 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
787 MonoDebugSourceLocation *source;
789 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
790 il_offset = source ? source->il_offset : -1;
791 mono_debug_free_source_location (source);
795 frame.il_offset = il_offset;
797 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
798 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
800 frame.actual_method = frame.method;
803 if (get_reg_locations)
804 frame.reg_locations = reg_locations;
806 if (func (&frame, &ctx, user_data))
809 if (get_reg_locations) {
810 for (i = 0; i < MONO_MAX_IREGS; ++i)
811 if (new_reg_locations [i])
812 reg_locations [i] = new_reg_locations [i];
820 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
821 MonoReflectionMethod **method,
822 gint32 *iloffset, gint32 *native_offset,
823 MonoString **file, gint32 *line, gint32 *column)
825 MonoDomain *domain = mono_domain_get ();
826 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
827 MonoLMF *lmf = mono_get_lmf ();
828 MonoJitInfo *ji = NULL;
829 MonoContext ctx, new_ctx;
830 MonoDebugSourceLocation *location;
831 MonoMethod *actual_method;
832 StackFrameInfo frame;
835 MONO_ARCH_CONTEXT_DEF;
837 mono_arch_flush_register_windows ();
839 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
840 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
842 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
848 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
852 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
856 *native_offset = frame.native_offset;
858 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
859 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)
864 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
866 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
868 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
870 *iloffset = location->il_offset;
874 if (need_file_info) {
876 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
877 *line = location->row;
878 *column = location->column;
885 mono_debug_free_source_location (location);
892 MonoSecurityFrame *frame;
893 } MonoFrameSecurityInfo;
896 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
898 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
899 MonoJitInfo *ji = frame->ji;
904 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
905 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
906 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
907 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
908 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
909 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
918 si->frame = mono_declsec_create_frame (frame->domain, ji);
920 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
925 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
926 * @skip: the number of stack frames to skip
928 * This function returns a the security informations of a single stack frame
929 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
930 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
934 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
936 MonoFrameSecurityInfo si;
941 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
943 return (si.skips == 0) ? si.frame : NULL;
955 grow_array (MonoSecurityStack *stack)
957 MonoDomain *domain = mono_domain_get ();
958 guint32 newsize = (stack->maximum << 1);
959 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
961 for (i=0; i < stack->maximum; i++) {
962 gpointer frame = mono_array_get (stack->stack, gpointer, i);
963 mono_array_setref (newstack, i, frame);
965 stack->maximum = newsize;
966 stack->stack = newstack;
970 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
972 MonoSecurityStack *ss = (MonoSecurityStack*) data;
973 MonoJitInfo *ji = frame->ji;
978 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
979 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
980 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
981 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
982 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
983 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
992 if (ss->count == ss->maximum)
995 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
997 /* continue down the stack */
1002 glist_to_array (GList *list, MonoClass *eclass)
1004 MonoDomain *domain = mono_domain_get ();
1011 len = g_list_length (list);
1012 res = mono_array_new (domain, eclass, len);
1014 for (i = 0; list; list = list->next, i++)
1015 mono_array_set (res, gpointer, i, list->data);
1021 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1022 * @skip: the number of stack frames to skip
1024 * This function returns an managed array of containing the security
1025 * informations for each frame (after the skipped ones). This is used for
1026 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1030 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1032 MonoSecurityStack ss;
1034 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1040 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1041 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1042 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1043 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1048 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1050 MonoClass *catch_class = ei->data.catch_class;
1051 MonoType *inflated_type;
1052 MonoGenericContext context;
1054 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1055 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1058 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1060 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1062 /* FIXME: we shouldn't inflate but instead put the
1063 type in the rgctx and fetch it from there. It
1064 might be a good idea to do this lazily, i.e. only
1065 when the exception is actually thrown, so as not to
1066 waste space for exception clauses which might never
1068 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1069 catch_class = mono_class_from_mono_type (inflated_type);
1070 mono_metadata_free_type (inflated_type);
1076 * mini_jit_info_table_find:
1078 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1079 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1080 * OUT_DOMAIN if it is not NULL.
1083 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1086 MonoInternalThread *t = mono_thread_internal_current ();
1092 ji = mono_jit_info_table_find (domain, addr);
1095 *out_domain = domain;
1099 /* maybe it is shared code, so we also search in the root domain */
1100 if (domain != mono_get_root_domain ()) {
1101 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1104 *out_domain = mono_get_root_domain ();
1109 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1110 for (; refs && *refs; refs++) {
1111 if (*refs != domain && *refs != mono_get_root_domain ()) {
1112 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1115 *out_domain = (MonoDomain*) *refs;
1125 * wrap_non_exception_throws:
1127 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1128 * WrapNonExceptionThrows flag set.
1131 wrap_non_exception_throws (MonoMethod *m)
1133 MonoAssembly *ass = m->klass->image->assembly;
1134 MonoCustomAttrInfo* attrs;
1135 static MonoClass *klass;
1137 gboolean val = FALSE;
1140 if (ass->wrap_non_exception_throws_inited)
1141 return ass->wrap_non_exception_throws;
1143 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1145 attrs = mono_custom_attrs_from_assembly (ass);
1147 for (i = 0; i < attrs->num_attrs; ++i) {
1148 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1150 int len, num_named, named_type, data_type, name_len;
1153 if (!attr->ctor || attr->ctor->klass != klass)
1155 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1156 len = attr->data_size;
1157 p = (const char*)attr->data;
1158 g_assert (read16 (p) == 0x0001);
1160 num_named = read16 (p);
1169 if (named_type != 0x54)
1171 name_len = mono_metadata_decode_blob_size (p, &p);
1172 name = g_malloc (name_len + 1);
1173 memcpy (name, p, name_len);
1174 name [name_len] = 0;
1176 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1178 /* The value is a BOOLEAN */
1181 mono_custom_attrs_free (attrs);
1184 ass->wrap_non_exception_throws = val;
1185 mono_memory_barrier ();
1186 ass->wrap_non_exception_throws_inited = TRUE;
1191 #ifndef MONO_ARCH_STACK_GROWS_UP
1192 #define DOES_STACK_GROWS_UP 1
1194 #define DOES_STACK_GROWS_UP 0
1197 #define MAX_UNMANAGED_BACKTRACE 128
1199 build_native_trace (void)
1201 /* This puppy only makes sense on mobile, IOW, ARM. */
1202 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1204 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1205 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1210 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1212 for (i = 0; i < size; i++)
1213 mono_array_set (res, gpointer, i, native_trace [i]);
1220 #define setup_managed_stacktrace_information() do { \
1221 if (mono_ex && !initial_trace_ips) { \
1222 trace_ips = g_list_reverse (trace_ips); \
1223 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1224 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1225 if (has_dynamic_methods) \
1226 /* These methods could go away anytime, so compute the stack trace now */ \
1227 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1229 g_list_free (trace_ips); \
1233 * mono_handle_exception_internal_first_pass:
1235 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1236 * OBJ is found. Run the index of the filter clause which caught the exception into
1237 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1240 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoObject *non_exception)
1242 MonoDomain *domain = mono_domain_get ();
1244 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1245 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1246 MonoLMF *lmf = mono_get_lmf ();
1247 MonoArray *initial_trace_ips = NULL;
1248 GList *trace_ips = NULL;
1249 MonoException *mono_ex;
1250 gboolean stack_overflow = FALSE;
1251 MonoContext initial_ctx;
1252 int frame_count = 0;
1253 gboolean has_dynamic_methods = FALSE;
1258 g_assert (ctx != NULL);
1260 if (obj == domain->stack_overflow_ex)
1261 stack_overflow = TRUE;
1263 mono_ex = (MonoException*)obj;
1264 initial_trace_ips = mono_ex->trace_ips;
1266 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1267 mono_ex = (MonoException*)obj;
1268 initial_trace_ips = mono_ex->trace_ips;
1274 call_filter = mono_get_call_filter ();
1276 g_assert (jit_tls->end_of_stack);
1277 g_assert (jit_tls->abort_func);
1280 *out_filter_idx = -1;
1287 MonoContext new_ctx;
1289 int clause_index_start = 0;
1290 gboolean unwind_res = TRUE;
1292 StackFrameInfo frame;
1294 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1296 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1300 g_assert (frame.type == FRAME_TYPE_MANAGED);
1305 setup_managed_stacktrace_information ();
1310 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1312 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1313 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1314 "The native frame called the managed method:\n%s\n",
1315 mono_method_full_name (ji->method, TRUE));
1318 if (ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1320 * Avoid overwriting the stack trace if the exception is
1321 * rethrown. Also avoid giant stack traces during a stack
1324 if (!initial_trace_ips && (frame_count < 1000)) {
1325 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1326 trace_ips = g_list_prepend (trace_ips,
1327 get_generic_info_from_stack_frame (ji, ctx));
1331 if (ji->method->dynamic)
1332 has_dynamic_methods = TRUE;
1334 if (stack_overflow) {
1335 if (DOES_STACK_GROWS_UP)
1336 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1338 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1340 free_stack = 0xffffff;
1343 for (i = clause_index_start; i < ji->num_clauses; i++) {
1344 MonoJitExceptionInfo *ei = &ji->clauses [i];
1345 gboolean filtered = FALSE;
1348 * During stack overflow, wait till the unwinding frees some stack
1349 * space before running handlers/finalizers.
1351 if (free_stack <= (64 * 1024))
1354 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1356 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1359 * Have to unwrap RuntimeWrappedExceptions if the
1360 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1362 if (non_exception && !wrap_non_exception_throws (ji->method))
1363 ex_obj = non_exception;
1367 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1368 gboolean is_user_frame = ji->method->wrapper_type == MONO_WRAPPER_NONE || ji->method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1369 mono_perfcounters->exceptions_filters++;
1370 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1373 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1374 trim the stackframe since if it returns FALSE we lose information.
1376 FIXME Not 100% sure if it's a good idea even with user clauses.
1379 setup_managed_stacktrace_information ();
1381 if (ji->from_llvm) {
1382 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1383 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1385 g_assert_not_reached ();
1388 /* store the exception object in bp + ei->exvar_offset */
1389 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1392 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1393 filtered = call_filter (ctx, ei->data.filter);
1394 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1395 if (filtered && out_filter_idx)
1396 *out_filter_idx = filter_idx;
1403 setup_managed_stacktrace_information ();
1404 /* mono_debugger_agent_handle_exception () needs this */
1405 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1410 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1411 setup_managed_stacktrace_information ();
1416 /* mono_debugger_agent_handle_exception () needs this */
1417 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1426 g_assert_not_reached ();
1430 * mono_handle_exception_internal:
1431 * @ctx: saved processor state
1432 * @obj: the exception object
1433 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1436 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1438 MonoDomain *domain = mono_domain_get ();
1440 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1441 static void (*restore_context) (void *);
1442 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1443 MonoLMF *lmf = mono_get_lmf ();
1444 MonoException *mono_ex;
1445 gboolean stack_overflow = FALSE;
1446 MonoContext initial_ctx;
1447 int frame_count = 0;
1448 gint32 filter_idx, first_filter_idx;
1451 MonoObject *non_exception = NULL;
1453 g_assert (ctx != NULL);
1455 MonoException *ex = mono_get_exception_null_reference ();
1456 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1457 obj = (MonoObject *)ex;
1461 * Allocate a new exception object instead of the preconstructed ones.
1463 if (obj == domain->stack_overflow_ex) {
1465 * It is not a good idea to try and put even more pressure on the little stack available.
1466 * obj = mono_get_exception_stack_overflow ();
1468 stack_overflow = TRUE;
1470 else if (obj == domain->null_reference_ex) {
1471 obj = mono_get_exception_null_reference ();
1474 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1475 non_exception = obj;
1476 obj = mono_get_exception_runtime_wrapped (obj);
1479 mono_ex = (MonoException*)obj;
1481 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1482 mono_ex = (MonoException*)obj;
1487 if (mono_ex && jit_tls->class_cast_from) {
1488 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1489 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1490 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1491 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1492 mono_ex->message = mono_string_new (domain, msg);
1497 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1498 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1499 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1500 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1501 mono_ex->message = mono_string_new (domain, msg);
1509 call_filter = mono_get_call_filter ();
1511 if (!restore_context)
1512 restore_context = mono_get_restore_context ();
1514 g_assert (jit_tls->end_of_stack);
1515 g_assert (jit_tls->abort_func);
1518 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1519 * end up being TRUE on any code path.
1521 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1526 MonoContext ctx_cp = *ctx;
1527 if (mono_trace_is_enabled ()) {
1528 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1529 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1530 MonoObject *message;
1531 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1533 MonoObject *exc = NULL;
1534 if (get_message == NULL) {
1536 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1538 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1540 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1544 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1546 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1548 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1549 mono_print_thread_dump_from_ctx (ctx);
1551 jit_tls->orig_ex_ctx_set = TRUE;
1552 mono_profiler_exception_thrown (obj);
1553 jit_tls->orig_ex_ctx_set = FALSE;
1555 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, non_exception);
1558 if (mini_get_debug_options ()->break_on_exc)
1560 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1562 if (mini_get_debug_options ()->suspend_on_unhandled) {
1563 fprintf (stderr, "Unhandled exception, suspending...");
1568 // FIXME: This runs managed code so it might cause another stack overflow when
1569 // we are handling a stack overflow
1570 mono_unhandled_exception (obj);
1573 // Treat exceptions that are "handled" by mono_runtime_invoke() as unhandled.
1576 if (ji && ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)
1577 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1579 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1589 MonoContext new_ctx;
1591 int clause_index_start = 0;
1592 gboolean unwind_res = TRUE;
1596 ji = jit_tls->resume_state.ji;
1597 new_ctx = jit_tls->resume_state.new_ctx;
1598 clause_index_start = jit_tls->resume_state.clause_index;
1599 lmf = jit_tls->resume_state.lmf;
1600 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1601 filter_idx = jit_tls->resume_state.filter_idx;
1603 StackFrameInfo frame;
1605 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1607 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1611 g_assert (frame.type == FRAME_TYPE_MANAGED);
1617 *(mono_get_lmf_addr ()) = lmf;
1619 jit_tls->abort_func (obj);
1620 g_assert_not_reached ();
1624 //printf ("M: %s %d.\n", mono_method_full_name (ji->method, TRUE), frame_count);
1626 if (stack_overflow) {
1627 if (DOES_STACK_GROWS_UP)
1628 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1630 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1632 free_stack = 0xffffff;
1635 for (i = clause_index_start; i < ji->num_clauses; i++) {
1636 MonoJitExceptionInfo *ei = &ji->clauses [i];
1637 gboolean filtered = FALSE;
1640 * During stack overflow, wait till the unwinding frees some stack
1641 * space before running handlers/finalizers.
1643 if (free_stack <= (64 * 1024))
1646 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1648 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1651 * Have to unwrap RuntimeWrappedExceptions if the
1652 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1654 if (non_exception && !wrap_non_exception_throws (ji->method))
1655 ex_obj = non_exception;
1659 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1660 if (ji->from_llvm) {
1661 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1662 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1664 g_assert_not_reached ();
1667 /* store the exception object in bp + ei->exvar_offset */
1668 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1672 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1674 * Filter clauses should only be run in the
1675 * first pass of exception handling.
1677 filtered = (filter_idx == first_filter_idx);
1681 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1682 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1684 * This guards against the situation that we abort a thread that is executing a finally clause
1685 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1686 * check for this situation here and resume interruption if we are below the guarded block.
1688 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1689 gboolean is_outside = FALSE;
1690 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1691 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1692 //FIXME make this stack direction aware
1693 if (catch_bp > prot_bp) {
1695 } else if (catch_bp == prot_bp) {
1696 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1697 * So we check if the catch handler_start is protected by the guarded handler protected region
1700 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1701 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1702 * There aren't any further finally/fault handler blocks down the stack over this exception.
1703 * This must be ensured by the code that installs the guard trampoline.
1705 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1707 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1712 jit_tls->handler_block_return_address = NULL;
1713 jit_tls->handler_block = NULL;
1714 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1718 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1719 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1720 jit_tls->orig_ex_ctx_set = TRUE;
1721 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1722 jit_tls->orig_ex_ctx_set = FALSE;
1723 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1724 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1725 *(mono_get_lmf_addr ()) = lmf;
1726 mono_perfcounters->exceptions_depth += frame_count;
1727 if (obj == domain->stack_overflow_ex)
1728 jit_tls->handling_stack_ovf = FALSE;
1732 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1733 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1734 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1735 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1736 jit_tls->orig_ex_ctx_set = TRUE;
1737 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1738 jit_tls->orig_ex_ctx_set = FALSE;
1739 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1740 call_filter (ctx, ei->handler_start);
1742 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1743 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1744 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1745 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1746 jit_tls->orig_ex_ctx_set = TRUE;
1747 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1748 jit_tls->orig_ex_ctx_set = FALSE;
1749 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), ex_obj);
1750 mono_perfcounters->exceptions_finallys++;
1751 *(mono_get_lmf_addr ()) = lmf;
1752 if (ji->from_llvm) {
1754 * LLVM compiled finally handlers follow the design
1755 * of the c++ ehabi, i.e. they call a resume function
1756 * at the end instead of returning to the caller.
1757 * So save the exception handling state,
1758 * mono_resume_unwind () will call us again to continue
1761 jit_tls->resume_state.ex_obj = obj;
1762 jit_tls->resume_state.ji = ji;
1763 jit_tls->resume_state.clause_index = i + 1;
1764 jit_tls->resume_state.ctx = *ctx;
1765 jit_tls->resume_state.new_ctx = new_ctx;
1766 jit_tls->resume_state.lmf = lmf;
1767 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1768 jit_tls->resume_state.filter_idx = filter_idx;
1769 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1772 call_filter (ctx, ei->handler_start);
1778 jit_tls->orig_ex_ctx_set = TRUE;
1779 mono_profiler_exception_method_leave (ji->method);
1780 jit_tls->orig_ex_ctx_set = FALSE;
1785 g_assert_not_reached ();
1789 * mono_debugger_handle_exception:
1791 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1792 * at the exception and FALSE to resume with the normal exception handling.
1794 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1795 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1796 * `callq throw' instruction.
1799 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1801 MonoDebuggerExceptionAction action;
1803 if (!mono_debug_using_mono_debugger ())
1807 MonoException *ex = mono_get_exception_null_reference ();
1808 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1809 obj = (MonoObject *)ex;
1812 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1814 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1816 * The debugger wants us to stop on the `throw' instruction.
1817 * By the time we get here, it already inserted a breakpoint there.
1820 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1821 MonoContext ctx_cp = *ctx;
1822 MonoJitInfo *ji = NULL;
1826 * The debugger wants us to stop only if this exception is user-unhandled.
1829 ret = mono_handle_exception_internal_first_pass (&ctx_cp, obj, NULL, &ji, NULL);
1830 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1832 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1833 * inside the method being invoked, so we handle it like a user-unhandled exception.
1840 * The exception is user-unhandled - tell the debugger to stop.
1842 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1846 * The exception is catched somewhere - resume with the normal exception handling and don't
1847 * stop in the debugger.
1855 * mono_debugger_run_finally:
1856 * @start_ctx: saved processor state
1858 * This method is called by the Mono Debugger to call all `finally' clauses of the
1859 * current stack frame. It's used when the user issues a `return' command to make
1860 * the current stack frame return. After returning from this method, the debugger
1861 * unwinds the stack one frame and gives control back to the user.
1863 * NOTE: This method is only used when running inside the Mono Debugger.
1866 mono_debugger_run_finally (MonoContext *start_ctx)
1868 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1869 MonoDomain *domain = mono_domain_get ();
1870 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1871 MonoLMF *lmf = mono_get_lmf ();
1872 MonoContext ctx, new_ctx;
1873 MonoJitInfo *ji, rji;
1878 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1879 if (!ji || ji == (gpointer)-1)
1883 call_filter = mono_get_call_filter ();
1885 for (i = 0; i < ji->num_clauses; i++) {
1886 MonoJitExceptionInfo *ei = &ji->clauses [i];
1888 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1889 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1890 call_filter (&ctx, ei->handler_start);
1896 * mono_handle_exception:
1897 * @ctx: saved processor state
1898 * @obj: the exception object
1901 mono_handle_exception (MonoContext *ctx, gpointer obj)
1903 mono_perfcounters->exceptions_thrown++;
1905 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1908 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1910 #ifndef MONO_ARCH_USE_SIGACTION
1911 #error "Can't use sigaltstack without sigaction"
1914 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1917 mono_setup_altstack (MonoJitTlsData *tls)
1921 guint8 *staddr = NULL;
1923 if (mono_running_on_valgrind ())
1926 mono_thread_get_stack_bounds (&staddr, &stsize);
1930 tls->end_of_stack = staddr + stsize;
1931 tls->stack_size = stsize;
1933 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1935 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1936 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1938 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1940 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1941 /* mprotect can fail for the main thread stack */
1942 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);
1943 g_assert (gaddr == tls->stack_ovf_guard_base);
1944 tls->stack_ovf_valloced = TRUE;
1947 /* Setup an alternate signal stack */
1948 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1949 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1951 g_assert (tls->signal_stack);
1953 sa.ss_sp = tls->signal_stack;
1954 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1958 sa.ss_flags = SS_ONSTACK;
1960 g_assert (sigaltstack (&sa, NULL) == 0);
1962 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);
1966 mono_free_altstack (MonoJitTlsData *tls)
1971 sa.ss_sp = tls->signal_stack;
1972 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1973 sa.ss_flags = SS_DISABLE;
1974 err = sigaltstack (&sa, NULL);
1975 g_assert (err == 0);
1977 if (tls->signal_stack)
1978 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1979 if (tls->stack_ovf_valloced)
1980 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1982 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1985 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1988 mono_setup_altstack (MonoJitTlsData *tls)
1993 mono_free_altstack (MonoJitTlsData *tls)
1997 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2000 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2002 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2003 /* we need to leave some room for throwing the exception */
2004 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2005 unprotect_size -= mono_pagesize ();
2006 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2007 * is sufficient stack
2009 //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);
2011 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2012 return unprotect_size == jit_tls->stack_ovf_guard_size;
2015 static G_GNUC_UNUSED void
2016 try_more_restore (void)
2018 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2019 if (try_restore_stack_protection (jit_tls, 500))
2020 jit_tls->restore_stack_prot = NULL;
2023 static G_GNUC_UNUSED void
2024 restore_stack_protection (void)
2026 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2027 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2028 /* if we can't restore the stack protection, keep a callback installed so
2029 * we'll try to restore as much stack as we can at each return from unmanaged
2032 if (try_restore_stack_protection (jit_tls, 4096))
2033 jit_tls->restore_stack_prot = NULL;
2035 jit_tls->restore_stack_prot = try_more_restore_tramp;
2036 /* here we also throw a stack overflow exception */
2037 ex->trace_ips = NULL;
2038 ex->stack_trace = NULL;
2039 mono_raise_exception (ex);
2043 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2045 void (*func)(void) = (gpointer)tramp_data;
2051 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2053 /* we got a stack overflow in the soft-guard pages
2054 * There are two cases:
2055 * 1) managed code caused the overflow: we unprotect the soft-guard page
2056 * and let the arch-specific code trigger the exception handling mechanism
2057 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2058 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2059 * and hope we can continue with those enabled, at least until the hard-guard page
2060 * is hit. The alternative to continuing here is to just print a message and abort.
2061 * We may add in the future the code to protect the pages again in the codepath
2062 * when we return from unmanaged to managed code.
2064 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2065 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2066 /* we unprotect the minimum amount we can */
2068 gboolean handled = FALSE;
2070 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2071 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2072 guard_size -= mono_pagesize ();
2074 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2075 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2076 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);
2077 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2079 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
2084 /* We print a message: after this even managed stack overflows
2085 * may crash the runtime
2087 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
2088 if (!jit_tls->handling_stack_ovf) {
2089 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2090 jit_tls->handling_stack_ovf = 1;
2092 /*fprintf (stderr, "Already handling stack overflow\n");*/
2102 MonoMethod *omethod;
2104 } PrintOverflowUserData;
2107 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2109 MonoMethod *method = NULL;
2110 PrintOverflowUserData *user_data = data;
2111 FILE *stream = user_data->stream;
2115 method = frame->ji->method;
2118 if (user_data->count == 0) {
2119 /* The first frame is in its prolog, so a line number cannot be computed */
2120 user_data->count ++;
2124 /* If this is a one method overflow, skip the other instances */
2125 if (method == user_data->omethod)
2128 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2129 fprintf (stream, " %s\n", location);
2132 if (user_data->count == 1) {
2133 fprintf (stream, " <...>\n");
2134 user_data->omethod = method;
2136 user_data->omethod = NULL;
2139 user_data->count ++;
2141 fprintf (stream, " at <unknown> <0x%05x>\n", frame->native_offset);
2147 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2149 PrintOverflowUserData ud;
2152 /* we don't do much now, but we can warn the user with a useful message */
2153 fprintf (stderr, "Stack overflow: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
2155 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2156 mono_arch_sigctx_to_monoctx (ctx, &mctx);
2158 fprintf (stderr, "Stacktrace:\n");
2160 memset (&ud, 0, sizeof (ud));
2163 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2165 if (ji && ji->method)
2166 fprintf (stderr, "At %s\n", mono_method_full_name (ji->method, TRUE));
2168 fprintf (stderr, "At <unmanaged>.\n");
2175 print_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2177 FILE *stream = (FILE*)data;
2178 MonoMethod *method = NULL;
2180 method = frame->ji->method;
2183 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2184 fprintf (stream, " %s\n", location);
2187 fprintf (stream, " at <unknown> <0x%05x>\n", frame->native_offset);
2192 static G_GNUC_UNUSED gboolean
2193 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2195 GString *p = (GString*)data;
2196 MonoMethod *method = NULL;
2198 method = frame->ji->method;
2201 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2202 g_string_append_printf (p, " %s\n", location);
2205 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2210 static gboolean handling_sigsegv = FALSE;
2213 * mono_handle_native_sigsegv:
2215 * Handle a SIGSEGV received while in native code by printing diagnostic
2216 * information and aborting.
2219 mono_handle_native_sigsegv (int signal, void *ctx)
2221 #ifdef MONO_ARCH_USE_SIGACTION
2222 struct sigaction sa;
2224 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2226 if (handling_sigsegv)
2229 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2230 fprintf (stderr, "Received SIGSEGV, suspending...");
2235 /* To prevent infinite loops when the stack walk causes a crash */
2236 handling_sigsegv = TRUE;
2238 /* !jit_tls means the thread was not registered with the runtime */
2239 if (jit_tls && mono_thread_internal_current ()) {
2240 fprintf (stderr, "Stacktrace:\n\n");
2242 mono_walk_stack (print_stack_frame, TRUE, stderr);
2247 #ifdef HAVE_BACKTRACE_SYMBOLS
2252 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2254 fprintf (stderr, "\nNative stacktrace:\n\n");
2256 size = backtrace (array, 256);
2257 names = backtrace_symbols (array, size);
2258 for (i =0; i < size; ++i) {
2259 fprintf (stderr, "\t%s\n", names [i]);
2265 /* Try to get more meaningful information using gdb */
2267 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2268 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
2269 /* From g_spawn_command_line_sync () in eglib */
2272 pid_t crashed_pid = getpid ();
2276 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2277 * it will deadlock. Call the syscall directly instead.
2279 pid = mono_runtime_syscall_fork ();
2282 dup2 (STDERR_FILENO, STDOUT_FILENO);
2284 mono_gdb_render_native_backtraces (crashed_pid);
2288 fprintf (stderr, "\nDebug info from gdb:\n\n");
2289 waitpid (pid, &status, 0);
2293 * A SIGSEGV indicates something went very wrong so we can no longer depend
2294 * on anything working. So try to print out lots of diagnostics, starting
2295 * with ones which have a greater chance of working.
2299 "=================================================================\n"
2300 "Got a %s while executing native code. This usually indicates\n"
2301 "a fatal error in the mono runtime or one of the native libraries \n"
2302 "used by your application.\n"
2303 "=================================================================\n"
2309 #ifdef MONO_ARCH_USE_SIGACTION
2311 /* Remove our SIGABRT handler */
2312 sa.sa_handler = SIG_DFL;
2313 sigemptyset (&sa.sa_mask);
2316 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2324 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2326 MonoInternalThread *thread = mono_thread_internal_current ();
2327 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2330 GString* text = g_string_new (0);
2331 char *name, *wapi_desc;
2332 GError *error = NULL;
2335 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2337 g_string_append_printf (text, "\n\"%s\"", name);
2340 else if (thread->threadpool_thread)
2341 g_string_append (text, "\n\"<threadpool thread>\"");
2343 g_string_append (text, "\n\"<unnamed thread>\"");
2346 wapi_desc = wapi_current_thread_desc ();
2347 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2351 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2353 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2355 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2357 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2359 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2361 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2364 fprintf (stdout, "%s", text->str);
2366 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2367 OutputDebugStringA(text->str);
2370 g_string_free (text, TRUE);
2375 * mono_print_thread_dump:
2377 * Print information about the current thread to stdout.
2378 * SIGCTX can be NULL, allowing this to be called from gdb.
2381 mono_print_thread_dump (void *sigctx)
2383 mono_print_thread_dump_internal (sigctx, NULL);
2387 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2389 mono_print_thread_dump_internal (NULL, ctx);
2393 * mono_resume_unwind:
2395 * This is called by a trampoline from LLVM compiled finally clauses to continue
2399 mono_resume_unwind (MonoContext *ctx)
2401 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2402 static void (*restore_context) (MonoContext *);
2403 MonoContext new_ctx;
2405 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2406 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2409 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2411 if (!restore_context)
2412 restore_context = mono_get_restore_context ();
2414 restore_context (&new_ctx);
2417 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2422 MonoJitExceptionInfo *ei;
2423 } FindHandlerBlockData;
2426 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2430 FindHandlerBlockData *pdata = data;
2431 MonoJitInfo *ji = frame->ji;
2436 if (ji->method->wrapper_type)
2439 ip = MONO_CONTEXT_GET_IP (ctx);
2441 for (i = 0; i < ji->num_clauses; ++i) {
2442 MonoJitExceptionInfo *ei = ji->clauses + i;
2443 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2445 /*If ip points to the first instruction it means the handler block didn't start
2446 so we can leave its execution to the EH machinery*/
2447 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2459 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2462 MonoJitExceptionInfo *clause = NULL;
2465 ip = MONO_CONTEXT_GET_IP (ctx);
2467 for (i = 0; i < ji->num_clauses; ++i) {
2468 clause = &ji->clauses [i];
2469 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2471 if (clause->handler_start < ip && clause->data.handler_end > ip)
2475 /*no matching finally */
2476 if (i == ji->num_clauses)
2479 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2480 if (ip == clause->handler_start)
2483 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2487 * Finds the bottom handler block running and install a block guard if needed.
2488 * FIXME add full-aot support.
2491 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2493 FindHandlerBlockData data = { 0 };
2494 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2501 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2502 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2504 if (!jit_tls || jit_tls->handler_block_return_address)
2507 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_SIGNAL_SAFE, &data);
2512 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2514 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2515 if (resume_ip == NULL)
2518 jit_tls->handler_block_return_address = resume_ip;
2519 jit_tls->handler_block = data.ei;
2526 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2534 mono_set_cast_details (MonoClass *from, MonoClass *to)
2536 MonoJitTlsData *jit_tls = NULL;
2538 if (mini_get_debug_options ()->better_cast_details) {
2539 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2540 jit_tls->class_cast_from = from;
2541 jit_tls->class_cast_to = to;
2546 /*returns false if the thread is not attached*/
2548 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2550 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2551 MonoInternalThread *thread = mono_thread_internal_current ();
2552 if (!thread || !thread->jit_data) {
2558 mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx);
2560 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2561 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2563 g_error ("Use a null sigctx requires a working mono-context");
2566 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2567 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2568 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2572 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2578 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2580 MonoInternalThread *thread = mono_thread_internal_current ();
2581 if (!thread || !thread->jit_data) {
2587 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2588 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2589 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2594 /*returns false if the thread is not attached*/
2596 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2598 MonoInternalThread *thread = mono_thread_internal_current ();
2599 MONO_ARCH_CONTEXT_DEF
2601 mono_arch_flush_register_windows ();
2603 if (!thread || !thread->jit_data) {
2607 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2608 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2610 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2613 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2614 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2615 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2621 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2623 void (*restore_context) (MonoContext *);
2624 restore_context = mono_get_restore_context ();
2626 mono_handle_exception (ctx, exc);
2627 restore_context (ctx);
2630 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2632 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2634 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2635 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2636 jit_tls->ex_ctx = *ctx;
2638 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2640 g_error ("This target doesn't support mono_arch_setup_async_callback");
2645 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2647 unhandled_exception_hook = func;
2648 unhandled_exception_hook_data = user_data;
2652 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2654 if (unhandled_exception_hook) {
2655 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2657 MonoObject *other = NULL;
2658 MonoString *str = mono_object_to_string (exc, &other);
2660 char *msg = mono_string_to_utf8 (str);
2661 fprintf (stderr, "[ERROR] FATAL UNHANDLED EXCEPTION: %s\n", msg);
2666 exit (mono_environment_exitcode_get ());
2669 g_assert_not_reached ();