2 * mini-exceptions.c: generic exception support
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Novell, Inc.
10 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
21 #ifdef HAVE_EXECINFO_H
25 #ifdef HAVE_SYS_TYPES_H
26 #include <sys/types.h>
29 #ifdef HAVE_SYS_WAIT_H
37 #ifdef HAVE_SYS_SYSCALL_H
38 #include <sys/syscall.h>
41 #ifdef HAVE_SYS_PRCTL_H
42 #include <sys/prctl.h>
49 #include <mono/metadata/appdomain.h>
50 #include <mono/metadata/tabledefs.h>
51 #include <mono/metadata/threads.h>
52 #include <mono/metadata/threads-types.h>
53 #include <mono/metadata/debug-helpers.h>
54 #include <mono/metadata/exception.h>
55 #include <mono/metadata/object-internals.h>
56 #include <mono/metadata/gc-internals.h>
57 #include <mono/metadata/mono-debug.h>
58 #include <mono/metadata/profiler.h>
59 #include <mono/metadata/mono-endian.h>
60 #include <mono/metadata/environment.h>
61 #include <mono/metadata/mono-mlist.h>
62 #include <mono/utils/mono-mmap.h>
63 #include <mono/utils/mono-logger-internals.h>
67 #include "debugger-agent.h"
68 #include "seq-points.h"
69 #include "llvm-runtime.h"
70 #include "mini-llvm.h"
73 #include "mini-llvm-cpp.h"
76 #ifdef ENABLE_EXTENSION_MODULE
77 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
80 #ifndef MONO_ARCH_CONTEXT_DEF
81 #define MONO_ARCH_CONTEXT_DEF
84 static gpointer restore_context_func, call_filter_func;
85 static gpointer throw_exception_func, rethrow_exception_func;
86 static gpointer throw_corlib_exception_func;
88 static gpointer try_more_restore_tramp = NULL;
89 static gpointer restore_stack_protection_tramp = NULL;
91 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
92 static gpointer unhandled_exception_hook_data = NULL;
94 static void try_more_restore (void);
95 static void restore_stack_protection (void);
96 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
97 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
98 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
101 mono_exceptions_init (void)
103 MonoRuntimeExceptionHandlingCallbacks cbs;
105 restore_context_func = mono_aot_get_trampoline ("restore_context");
106 call_filter_func = mono_aot_get_trampoline ("call_filter");
107 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
108 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
112 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
113 mono_tramp_info_register (info, NULL);
114 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
115 mono_tramp_info_register (info, NULL);
116 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
117 mono_tramp_info_register (info, NULL);
118 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
119 mono_tramp_info_register (info, NULL);
121 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
122 if (!mono_llvm_only) {
123 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
124 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
128 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
129 mono_arch_exceptions_init ();
131 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
132 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
135 cbs.mono_raise_exception = mono_llvm_raise_exception;
137 cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
138 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
139 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
140 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
141 mono_install_eh_callbacks (&cbs);
145 mono_get_throw_exception (void)
147 g_assert (throw_exception_func);
148 return throw_exception_func;
152 mono_get_rethrow_exception (void)
154 g_assert (rethrow_exception_func);
155 return rethrow_exception_func;
159 mono_get_call_filter (void)
161 g_assert (call_filter_func);
162 return call_filter_func;
166 mono_get_restore_context (void)
168 g_assert (restore_context_func);
169 return restore_context_func;
173 mono_get_throw_corlib_exception (void)
175 gpointer code = NULL;
178 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
179 if (throw_corlib_exception_func)
180 return throw_corlib_exception_func;
183 code = mono_aot_get_trampoline ("throw_corlib_exception");
185 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
186 mono_tramp_info_register (info, NULL);
189 mono_memory_barrier ();
191 throw_corlib_exception_func = code;
193 return throw_corlib_exception_func;
197 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
199 MonoTryBlockHoleTableJitInfo *table;
204 if (ei->try_start > ip || ip >= ei->try_end)
207 if (!ji->has_try_block_holes)
210 table = mono_jit_info_get_try_block_hole_table_info (ji);
211 offset = (guint32)((char*)ip - (char*)ji->code_start);
212 clause = (guint16)(ei - ji->clauses);
213 g_assert (clause < ji->num_clauses);
215 for (i = 0; i < table->num_holes; ++i) {
216 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
217 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
226 * Translate between the mono_arch_unwind_frame function and the old API.
229 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
230 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
232 StackFrameInfo frame;
235 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
237 /* Avoid costly table lookup during stack overflow */
238 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
241 ji = mini_jit_info_table_find (domain, (char *)ip, NULL);
246 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
248 return (MonoJitInfo *)-1;
250 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
252 * Remove any unused lmf.
253 * Mask out the lower bits which might be used to hold additional information.
255 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
258 /* Convert between the new and the old APIs */
259 switch (frame.type) {
260 case FRAME_TYPE_MANAGED:
264 case FRAME_TYPE_TRAMPOLINE:
266 case FRAME_TYPE_MANAGED_TO_NATIVE:
270 memset (res, 0, sizeof (MonoJitInfo));
271 res->d.method = frame.method;
274 case FRAME_TYPE_DEBUGGER_INVOKE: {
278 * The normal exception handling code can't handle this frame, so just
281 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
282 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
286 g_assert_not_reached ();
291 /* mono_find_jit_info:
293 * This function is used to gather information from @ctx. It return the
294 * MonoJitInfo of the corresponding function, unwinds one stack frame and
295 * stores the resulting context into @new_ctx. It also stores a string
296 * describing the stack location into @trace (if not NULL), and modifies
297 * the @lmf if necessary. @native_offset return the IP offset from the
298 * start of the function or -1 if that info is not available.
301 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
302 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
306 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
308 MonoMethod *method = NULL;
319 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
321 if (ji == (gpointer)-1)
324 if (ji && !ji->is_trampoline)
325 method = jinfo_get_method (ji);
327 if (managed2 || (method && method->wrapper_type)) {
328 const char *real_ip, *start;
331 start = (const char *)ji->code_start;
333 /* ctx->ip points into native code */
334 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
336 real_ip = (const char*)ip;
338 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
339 offset = real_ip - start;
344 *native_offset = offset;
347 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
351 *trace = mono_debug_print_stack_frame (method, offset, domain);
354 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
355 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
364 * mono_find_jit_info_ext:
366 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
368 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
369 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
370 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
371 * to obtain the last managed frame.
372 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
373 * On return, it will be filled with the locations where callee saved registers are saved
374 * by the current frame. This is returned outside of StackFrameInfo because it can be
375 * quite large on some platforms.
376 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
380 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
381 MonoJitInfo *prev_ji, MonoContext *ctx,
382 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
383 mgreg_t **save_locations,
384 StackFrameInfo *frame)
387 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
389 MonoDomain *target_domain = domain;
390 MonoMethod *method = NULL;
391 gboolean async = mono_thread_info_is_async_context ();
396 /* Avoid costly table lookup during stack overflow */
397 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
400 ji = mini_jit_info_table_find (domain, (char *)ip, &target_domain);
403 target_domain = domain;
406 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
408 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
412 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
414 * Remove any unused lmf.
415 * Mask out the lower bits which might be used to hold additional information.
417 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
420 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
421 method = jinfo_get_method (frame->ji);
423 if (frame->type == FRAME_TYPE_MANAGED && method) {
424 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
425 frame->managed = TRUE;
428 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
430 * This type of frame is just a marker, the caller should unwind once more to get the
431 * last managed frame.
434 frame->method = NULL;
437 frame->native_offset = -1;
438 frame->domain = target_domain;
439 frame->async_context = async;
443 if (frame->type == FRAME_TYPE_MANAGED)
444 frame->method = method;
446 if (ji && (frame->managed || (method && method->wrapper_type))) {
447 const char *real_ip, *start;
449 start = (const char *)ji->code_start;
451 /* ctx->ip points into native code */
452 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
454 real_ip = (const char*)ip;
456 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
457 frame->native_offset = real_ip - start;
459 frame->native_offset = -1;
462 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
464 if (trace && frame->method) {
465 char *fname = mono_method_full_name (frame->method, TRUE);
466 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
475 * This function is async-safe.
478 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
480 MonoGenericJitInfo *gi;
484 if (!ji->has_generic_jit_info)
486 gi = mono_jit_info_get_generic_jit_info (ji);
492 * Search location list if available, it contains the precise location of the
493 * argument for every pc offset, even if the method was interrupted while it was in
497 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
500 for (i = 0; i < gi->nlocs; ++i) {
501 MonoDwarfLocListEntry *entry = &gi->locations [i];
503 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
505 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
507 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
511 g_assert (i < gi->nlocs);
514 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
516 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
520 method = jinfo_get_method (ji);
521 if (mono_method_get_context (method)->method_inst) {
522 /* A MonoMethodRuntimeGenericContext* */
524 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
528 /* Avoid returning a managed object */
529 MonoObject *this_obj = (MonoObject *)info;
531 return this_obj->vtable;
536 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
538 static MonoGenericContext
539 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
541 MonoGenericContext context = { NULL, NULL };
542 MonoClass *klass, *method_container_class;
545 g_assert (generic_info);
547 method = jinfo_get_method (ji);
548 g_assert (method->is_inflated);
549 if (mono_method_get_context (method)->method_inst) {
550 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
552 klass = mrgctx->class_vtable->klass;
553 context.method_inst = mrgctx->method_inst;
554 g_assert (context.method_inst);
556 MonoVTable *vtable = (MonoVTable *)generic_info;
558 klass = vtable->klass;
561 //g_assert (!method->klass->generic_container);
562 if (method->klass->generic_class)
563 method_container_class = method->klass->generic_class->container_class;
565 method_container_class = method->klass;
567 /* class might refer to a subclass of method's class */
568 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
569 klass = klass->parent;
573 if (klass->generic_class || klass->generic_container)
574 context.class_inst = mini_class_get_context (klass)->class_inst;
576 if (klass->generic_class)
577 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
579 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
585 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
588 MonoGenericContext context;
591 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
592 return jinfo_get_method (ji);
593 context = get_generic_context_from_stack_frame (ji, generic_info);
595 method = jinfo_get_method (ji);
596 method = mono_method_get_declaring_generic_method (method);
597 method = mono_class_inflate_generic_method_checked (method, &context, &error);
598 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
604 * mono_exception_walk_native_trace:
605 * @ex: The exception object whose frames should be walked
606 * @func: callback to call for each stack frame
607 * @user_data: data passed to the callback
609 * This function walks the stacktrace of an exception. For
610 * each frame the callback function is called with the relevant info.
611 * The walk ends when no more stack frames are found or when the callback
612 * returns a TRUE value.
616 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
618 MonoDomain *domain = mono_domain_get ();
619 MonoArray *ta = ex->trace_ips;
625 len = mono_array_length (ta) >> 1;
626 for (i = 0; i < len; i++) {
627 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
628 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
629 MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)ip);
632 if (func (NULL, ip, 0, FALSE, user_data))
635 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
636 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
645 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
647 MonoDomain *domain = mono_domain_get ();
649 MonoArray *ta = exc->trace_ips;
650 MonoDebugSourceLocation *location;
654 /* Exception is not thrown yet */
655 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
658 len = mono_array_length (ta) >> 1;
660 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
662 for (i = skip; i < len; i++) {
664 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
665 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
666 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
669 ji = mono_jit_info_table_find (domain, (char *)ip);
671 /* Unmanaged frame */
672 mono_array_setref (res, i, sf);
676 g_assert (ji != NULL);
678 method = get_method_from_stack_frame (ji, generic_info);
679 if (jinfo_get_method (ji)->wrapper_type) {
683 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
684 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
688 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
690 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
691 sf->method_address = (gsize) ji->code_start;
692 sf->native_offset = (char *)ip - (char *)ji->code_start;
695 * mono_debug_lookup_source_location() returns both the file / line number information
696 * and the IL offset. Note that computing the IL offset is already an expensive
697 * operation, so we shouldn't call this method twice.
699 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
701 sf->il_offset = location->il_offset;
704 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
705 sf->il_offset = sp.il_offset;
710 if (need_file_info) {
711 if (location && location->source_file) {
712 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
713 sf->line = location->row;
714 sf->column = location->column;
716 sf->line = sf->column = 0;
721 mono_debug_free_source_location (location);
722 mono_array_setref (res, i, sf);
729 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
732 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
733 if (jit_tls && jit_tls->orig_ex_ctx_set)
734 start_ctx = &jit_tls->orig_ex_ctx;
736 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
739 * mono_walk_stack_with_ctx:
741 * Unwind the current thread starting at @start_ctx.
743 * If @start_ctx is null, we capture the current context.
746 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
748 MonoContext extra_ctx;
749 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
750 MONO_ARCH_CONTEXT_DEF
752 if (!thread || !thread->jit_data)
756 mono_arch_flush_register_windows ();
758 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
759 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
761 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
763 start_ctx = &extra_ctx;
766 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
770 * mono_walk_stack_with_state:
772 * Unwind a thread described by @state.
774 * State must be valid (state->valid == TRUE).
776 * If you are using this function to unwind another thread, make sure it is suspended.
778 * If @state is null, we capture the current context.
781 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
783 MonoThreadUnwindState extra_state;
785 g_assert (!mono_thread_info_is_async_context ());
786 if (!mono_thread_state_init_from_current (&extra_state))
788 state = &extra_state;
791 g_assert (state->valid);
793 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
797 mono_walk_stack_full (func,
799 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
800 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
801 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
802 unwind_options, user_data);
806 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
808 MonoThreadUnwindState state;
809 if (!mono_thread_state_init_from_current (&state))
811 mono_walk_stack_with_state (func, &state, options, user_data);
815 * mono_walk_stack_full:
816 * @func: callback to call for each stack frame
817 * @domain: starting appdomain, can be NULL to use the current domain
818 * @unwind_options: what extra information the unwinder should gather
819 * @start_ctx: starting state of the stack walk, can be NULL.
820 * @thread: the thread whose stack to walk, can be NULL to use the current thread
821 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
822 * @user_data: data passed to the callback
824 * This function walks the stack of a thread, starting from the state
825 * represented by start_ctx. For each frame the callback
826 * function is called with the relevant info. The walk ends when no more
827 * managed stack frames are found or when the callback returns a TRUE value.
830 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
833 MonoContext ctx, new_ctx;
834 StackFrameInfo frame;
836 mgreg_t *reg_locations [MONO_MAX_IREGS];
837 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
838 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
839 gboolean async = mono_thread_info_is_async_context ();
841 g_assert (start_ctx);
844 /*The LMF will be null if the target have no managed frames.*/
845 /* g_assert (lmf); */
848 g_assert (unwind_options == MONO_UNWIND_NONE);
850 memcpy (&ctx, start_ctx, sizeof (MonoContext));
851 memset (reg_locations, 0, sizeof (reg_locations));
853 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
855 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
859 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
860 MonoDebugSourceLocation *source;
862 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
864 il_offset = source->il_offset;
867 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
868 il_offset = sp.il_offset;
872 mono_debug_free_source_location (source);
876 frame.il_offset = il_offset;
878 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
879 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
881 frame.actual_method = frame.method;
884 if (get_reg_locations)
885 frame.reg_locations = reg_locations;
887 if (func (&frame, &ctx, user_data))
890 if (get_reg_locations) {
891 for (i = 0; i < MONO_MAX_IREGS; ++i)
892 if (new_reg_locations [i])
893 reg_locations [i] = new_reg_locations [i];
901 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
902 MonoReflectionMethod **method,
903 gint32 *iloffset, gint32 *native_offset,
904 MonoString **file, gint32 *line, gint32 *column)
906 MonoDomain *domain = mono_domain_get ();
907 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
908 MonoLMF *lmf = mono_get_lmf ();
909 MonoJitInfo *ji = NULL;
910 MonoContext ctx, new_ctx;
911 MonoDebugSourceLocation *location;
912 MonoMethod *jmethod = NULL, *actual_method;
913 StackFrameInfo frame;
916 MONO_ARCH_CONTEXT_DEF;
918 mono_arch_flush_register_windows ();
920 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
921 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
923 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
929 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
933 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
934 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
935 frame.type == FRAME_TYPE_TRAMPOLINE)
939 *native_offset = frame.native_offset;
941 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
942 jmethod = jinfo_get_method (ji);
943 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
948 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
950 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
952 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
954 *iloffset = location->il_offset;
958 if (need_file_info) {
960 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
961 *line = location->row;
962 *column = location->column;
969 mono_debug_free_source_location (location);
975 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
977 MonoClass *catch_class = ei->data.catch_class;
978 MonoType *inflated_type;
979 MonoGenericContext context;
981 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
982 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
985 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
987 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
989 /* FIXME: we shouldn't inflate but instead put the
990 type in the rgctx and fetch it from there. It
991 might be a good idea to do this lazily, i.e. only
992 when the exception is actually thrown, so as not to
993 waste space for exception clauses which might never
995 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
996 catch_class = mono_class_from_mono_type (inflated_type);
997 mono_metadata_free_type (inflated_type);
1003 * mini_jit_info_table_find_ext:
1005 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1006 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1007 * OUT_DOMAIN if it is not NULL.
1010 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1013 MonoInternalThread *t = mono_thread_internal_current ();
1019 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1022 *out_domain = domain;
1026 /* maybe it is shared code, so we also search in the root domain */
1027 if (domain != mono_get_root_domain ()) {
1028 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1031 *out_domain = mono_get_root_domain ();
1039 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1040 for (; refs && *refs; refs++) {
1041 if (*refs != domain && *refs != mono_get_root_domain ()) {
1042 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1045 *out_domain = (MonoDomain*) *refs;
1055 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1057 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1061 * wrap_non_exception_throws:
1063 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1064 * WrapNonExceptionThrows flag set.
1067 wrap_non_exception_throws (MonoMethod *m)
1069 MonoAssembly *ass = m->klass->image->assembly;
1070 MonoCustomAttrInfo* attrs;
1071 static MonoClass *klass;
1073 gboolean val = FALSE;
1076 if (ass->wrap_non_exception_throws_inited)
1077 return ass->wrap_non_exception_throws;
1079 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1081 attrs = mono_custom_attrs_from_assembly (ass);
1083 for (i = 0; i < attrs->num_attrs; ++i) {
1084 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1086 int num_named, named_type, name_len;
1089 if (!attr->ctor || attr->ctor->klass != klass)
1091 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1092 p = (const char*)attr->data;
1093 g_assert (read16 (p) == 0x0001);
1095 num_named = read16 (p);
1101 /* data_type = *p; */
1104 if (named_type != 0x54)
1106 name_len = mono_metadata_decode_blob_size (p, &p);
1107 name = (char *)g_malloc (name_len + 1);
1108 memcpy (name, p, name_len);
1109 name [name_len] = 0;
1111 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1113 /* The value is a BOOLEAN */
1116 mono_custom_attrs_free (attrs);
1119 ass->wrap_non_exception_throws = val;
1120 mono_memory_barrier ();
1121 ass->wrap_non_exception_throws_inited = TRUE;
1126 #ifndef MONO_ARCH_STACK_GROWS_UP
1127 #define DOES_STACK_GROWS_UP 1
1129 #define DOES_STACK_GROWS_UP 0
1132 #define MAX_UNMANAGED_BACKTRACE 128
1134 build_native_trace (void)
1136 /* This puppy only makes sense on mobile, IOW, ARM. */
1137 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1139 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1140 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1145 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1147 for (i = 0; i < size; i++)
1148 mono_array_set (res, gpointer, i, native_trace [i]);
1156 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1158 if (mono_ex && !initial_trace_ips) {
1159 *trace_ips = g_list_reverse (*trace_ips);
1160 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (*trace_ips, mono_defaults.int_class));
1161 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1162 if (dynamic_methods) {
1163 /* These methods could go away anytime, so save a reference to them in the exception object */
1165 MonoMList *list = NULL;
1167 for (l = dynamic_methods; l; l = l->next) {
1169 MonoDomain *domain = mono_domain_get ();
1171 if (domain->method_to_dyn_method) {
1172 mono_domain_lock (domain);
1173 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1174 mono_domain_unlock (domain);
1176 MonoObject *o = mono_gchandle_get_target (dis_link);
1178 list = mono_mlist_prepend (list, o);
1184 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1187 g_list_free (*trace_ips);
1192 * mono_handle_exception_internal_first_pass:
1194 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1195 * OBJ is found. Run the index of the filter clause which caught the exception into
1196 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1199 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1201 MonoDomain *domain = mono_domain_get ();
1202 MonoJitInfo *ji = NULL;
1203 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1204 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1205 MonoLMF *lmf = mono_get_lmf ();
1206 MonoArray *initial_trace_ips = NULL;
1207 GList *trace_ips = NULL;
1208 GSList *dynamic_methods = NULL;
1209 MonoException *mono_ex;
1210 gboolean stack_overflow = FALSE;
1211 MonoContext initial_ctx;
1213 int frame_count = 0;
1218 g_assert (ctx != NULL);
1220 if (obj == (MonoObject *)domain->stack_overflow_ex)
1221 stack_overflow = TRUE;
1223 mono_ex = (MonoException*)obj;
1224 initial_trace_ips = mono_ex->trace_ips;
1226 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1227 mono_ex = (MonoException*)obj;
1228 initial_trace_ips = mono_ex->trace_ips;
1234 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1236 g_assert (jit_tls->end_of_stack);
1237 g_assert (jit_tls->abort_func);
1240 *out_filter_idx = -1;
1244 *out_prev_ji = NULL;
1249 MonoContext new_ctx;
1251 int clause_index_start = 0;
1252 gboolean unwind_res = TRUE;
1254 StackFrameInfo frame;
1259 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1261 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1262 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1263 frame.type == FRAME_TYPE_TRAMPOLINE) {
1267 g_assert (frame.type == FRAME_TYPE_MANAGED);
1272 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1273 g_slist_free (dynamic_methods);
1278 method = jinfo_get_method (ji);
1279 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1281 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1282 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1283 "The native frame called the managed method:\n%s\n",
1284 mono_method_full_name (method, TRUE));
1287 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1289 * Avoid overwriting the stack trace if the exception is
1290 * rethrown. Also avoid giant stack traces during a stack
1293 if (!initial_trace_ips && (frame_count < 1000)) {
1294 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1295 trace_ips = g_list_prepend (trace_ips,
1296 get_generic_info_from_stack_frame (ji, ctx));
1300 if (method->dynamic)
1301 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1303 if (stack_overflow) {
1304 if (DOES_STACK_GROWS_UP)
1305 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1307 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1309 free_stack = 0xffffff;
1312 for (i = clause_index_start; i < ji->num_clauses; i++) {
1313 MonoJitExceptionInfo *ei = &ji->clauses [i];
1314 gboolean filtered = FALSE;
1317 * During stack overflow, wait till the unwinding frees some stack
1318 * space before running handlers/finalizers.
1320 if (free_stack <= (64 * 1024))
1323 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1325 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1328 * Have to unwrap RuntimeWrappedExceptions if the
1329 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1331 if (non_exception && !wrap_non_exception_throws (method))
1332 ex_obj = non_exception;
1336 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1337 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1338 #ifndef DISABLE_PERFCOUNTERS
1339 mono_perfcounters->exceptions_filters++;
1342 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1343 trim the stackframe since if it returns FALSE we lose information.
1345 FIXME Not 100% sure if it's a good idea even with user clauses.
1348 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1350 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1352 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1354 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1355 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1357 g_assert (!ji->from_llvm);
1358 /* store the exception object in bp + ei->exvar_offset */
1359 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1362 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1364 * Pass the original il clause index to the landing pad so it can
1365 * branch to the landing pad associated with the il clause.
1366 * This is needed because llvm compiled code assumes that the EH
1367 * code always branches to the innermost landing pad.
1370 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1373 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1374 filtered = call_filter (ctx, ei->data.filter);
1375 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1376 if (filtered && out_filter_idx)
1377 *out_filter_idx = filter_idx;
1384 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1385 g_slist_free (dynamic_methods);
1386 /* mono_debugger_agent_handle_exception () needs this */
1387 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1392 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1393 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1394 g_slist_free (dynamic_methods);
1399 /* mono_debugger_agent_handle_exception () needs this */
1400 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1409 g_assert_not_reached ();
1413 * mono_handle_exception_internal:
1414 * @ctx: saved processor state
1415 * @obj: the exception object
1416 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1419 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1421 MonoDomain *domain = mono_domain_get ();
1422 MonoJitInfo *ji, *prev_ji;
1423 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1424 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1425 MonoLMF *lmf = mono_get_lmf ();
1426 MonoException *mono_ex;
1427 gboolean stack_overflow = FALSE;
1428 MonoContext initial_ctx;
1430 int frame_count = 0;
1431 gint32 filter_idx, first_filter_idx = 0;
1434 MonoObject *non_exception = NULL;
1436 g_assert (ctx != NULL);
1438 MonoException *ex = mono_get_exception_null_reference ();
1439 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1440 obj = (MonoObject *)ex;
1444 * Allocate a new exception object instead of the preconstructed ones.
1446 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1448 * It is not a good idea to try and put even more pressure on the little stack available.
1449 * obj = mono_get_exception_stack_overflow ();
1451 stack_overflow = TRUE;
1453 else if (obj == (MonoObject *)domain->null_reference_ex) {
1454 obj = (MonoObject *)mono_get_exception_null_reference ();
1457 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1458 non_exception = obj;
1459 obj = (MonoObject *)mono_get_exception_runtime_wrapped (obj);
1462 mono_ex = (MonoException*)obj;
1464 if (mini_get_debug_options ()->suspend_on_exception) {
1465 mono_runtime_printf_err ("Exception thrown, suspending...");
1470 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1471 mono_ex = (MonoException*)obj;
1476 if (mono_ex && jit_tls->class_cast_from) {
1477 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1478 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1479 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1480 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1481 mono_ex->message = mono_string_new (domain, msg);
1486 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1487 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1488 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1489 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1490 mono_ex->message = mono_string_new (domain, msg);
1498 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1500 g_assert (jit_tls->end_of_stack);
1501 g_assert (jit_tls->abort_func);
1504 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1505 * end up being TRUE on any code path.
1507 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1512 MonoContext ctx_cp = *ctx;
1513 if (mono_trace_is_enabled ()) {
1514 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1515 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1516 MonoObject *message;
1517 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1519 MonoObject *exc = NULL;
1520 if (get_message == NULL) {
1522 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1524 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1526 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1530 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1532 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)mono_native_thread_id_get (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1534 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1535 mono_print_thread_dump_from_ctx (ctx);
1537 jit_tls->orig_ex_ctx_set = TRUE;
1538 mono_profiler_exception_thrown (obj);
1539 jit_tls->orig_ex_ctx_set = FALSE;
1541 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1544 if (mini_get_debug_options ()->break_on_exc)
1546 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1548 if (mini_get_debug_options ()->suspend_on_unhandled) {
1549 mono_runtime_printf_err ("Unhandled exception, suspending...");
1554 // FIXME: This runs managed code so it might cause another stack overflow when
1555 // we are handling a stack overflow
1556 mono_unhandled_exception (obj);
1558 gboolean unhandled = FALSE;
1561 * The exceptions caught by the mono_runtime_invoke () calls
1562 * in the threadpool needs to be treated as unhandled (#669836).
1564 * FIXME: The check below is hackish, but its hard to distinguish
1565 * these runtime invoke calls from others in the runtime.
1567 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1568 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1573 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1575 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1585 MonoContext new_ctx;
1587 int clause_index_start = 0;
1588 gboolean unwind_res = TRUE;
1592 ji = jit_tls->resume_state.ji;
1593 new_ctx = jit_tls->resume_state.new_ctx;
1594 clause_index_start = jit_tls->resume_state.clause_index;
1595 lmf = jit_tls->resume_state.lmf;
1596 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1597 filter_idx = jit_tls->resume_state.filter_idx;
1599 StackFrameInfo frame;
1601 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1603 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1604 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1605 frame.type == FRAME_TYPE_TRAMPOLINE) {
1609 g_assert (frame.type == FRAME_TYPE_MANAGED);
1615 *(mono_get_lmf_addr ()) = lmf;
1617 jit_tls->abort_func (obj);
1618 g_assert_not_reached ();
1621 method = jinfo_get_method (ji);
1623 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1625 if (stack_overflow) {
1626 if (DOES_STACK_GROWS_UP)
1627 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1629 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1631 free_stack = 0xffffff;
1634 for (i = clause_index_start; i < ji->num_clauses; i++) {
1635 MonoJitExceptionInfo *ei = &ji->clauses [i];
1636 gboolean filtered = FALSE;
1639 * During stack overflow, wait till the unwinding frees some stack
1640 * space before running handlers/finalizers.
1642 if (free_stack <= (64 * 1024))
1645 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1647 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1650 * Have to unwrap RuntimeWrappedExceptions if the
1651 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1653 if (non_exception && !wrap_non_exception_throws (method))
1654 ex_obj = non_exception;
1658 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1659 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1660 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1662 g_assert (!ji->from_llvm);
1663 /* store the exception object in bp + ei->exvar_offset */
1664 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1668 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1670 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1673 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1675 * Filter clauses should only be run in the
1676 * first pass of exception handling.
1678 filtered = (filter_idx == first_filter_idx);
1682 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1683 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1685 * This guards against the situation that we abort a thread that is executing a finally clause
1686 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1687 * check for this situation here and resume interruption if we are below the guarded block.
1689 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1690 gboolean is_outside = FALSE;
1691 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1692 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1693 //FIXME make this stack direction aware
1694 if (catch_bp > prot_bp) {
1696 } else if (catch_bp == prot_bp) {
1697 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1698 * So we check if the catch handler_start is protected by the guarded handler protected region
1701 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1702 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1703 * There aren't any further finally/fault handler blocks down the stack over this exception.
1704 * This must be ensured by the code that installs the guard trampoline.
1706 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1708 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1713 jit_tls->handler_block_return_address = NULL;
1714 jit_tls->handler_block = NULL;
1715 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1719 if (mono_trace_is_enabled () && mono_trace_eval (method))
1720 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1721 jit_tls->orig_ex_ctx_set = TRUE;
1722 mono_profiler_exception_clause_handler (method, ei->flags, i);
1723 jit_tls->orig_ex_ctx_set = FALSE;
1724 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1726 #ifndef DISABLE_PERFCOUNTERS
1727 mono_perfcounters->exceptions_depth += frame_count;
1729 if (obj == (MonoObject *)domain->stack_overflow_ex)
1730 jit_tls->handling_stack_ovf = FALSE;
1734 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1735 if (mono_trace_is_enabled () && mono_trace_eval (method))
1736 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1737 jit_tls->orig_ex_ctx_set = TRUE;
1738 mono_profiler_exception_clause_handler (method, ei->flags, i);
1739 jit_tls->orig_ex_ctx_set = FALSE;
1740 call_filter (ctx, ei->handler_start);
1742 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1743 if (mono_trace_is_enabled () && mono_trace_eval (method))
1744 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1745 jit_tls->orig_ex_ctx_set = TRUE;
1746 mono_profiler_exception_clause_handler (method, ei->flags, i);
1747 jit_tls->orig_ex_ctx_set = FALSE;
1748 #ifndef DISABLE_PERFCOUNTERS
1749 mono_perfcounters->exceptions_finallys++;
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 (method);
1780 jit_tls->orig_ex_ctx_set = FALSE;
1785 g_assert_not_reached ();
1789 * mono_debugger_run_finally:
1790 * @start_ctx: saved processor state
1792 * This method is called by the Mono Debugger to call all `finally' clauses of the
1793 * current stack frame. It's used when the user issues a `return' command to make
1794 * the current stack frame return. After returning from this method, the debugger
1795 * unwinds the stack one frame and gives control back to the user.
1797 * NOTE: This method is only used when running inside the Mono Debugger.
1800 mono_debugger_run_finally (MonoContext *start_ctx)
1802 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1803 MonoDomain *domain = mono_domain_get ();
1804 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1805 MonoLMF *lmf = mono_get_lmf ();
1806 MonoContext ctx, new_ctx;
1807 MonoJitInfo *ji, rji;
1812 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1813 if (!ji || ji == (gpointer)-1)
1817 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
1819 for (i = 0; i < ji->num_clauses; i++) {
1820 MonoJitExceptionInfo *ei = &ji->clauses [i];
1822 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1823 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1824 call_filter (&ctx, ei->handler_start);
1830 * mono_handle_exception:
1831 * @ctx: saved processor state
1832 * @obj: the exception object
1835 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
1837 #ifndef DISABLE_PERFCOUNTERS
1838 mono_perfcounters->exceptions_thrown++;
1841 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1844 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1846 #ifndef MONO_ARCH_USE_SIGACTION
1847 #error "Can't use sigaltstack without sigaction"
1850 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1853 mono_setup_altstack (MonoJitTlsData *tls)
1857 guint8 *staddr = NULL;
1859 if (mono_running_on_valgrind ())
1862 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1866 tls->end_of_stack = staddr + stsize;
1867 tls->stack_size = stsize;
1869 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1871 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1872 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1874 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1876 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1877 /* mprotect can fail for the main thread stack */
1878 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);
1879 g_assert (gaddr == tls->stack_ovf_guard_base);
1880 tls->stack_ovf_valloced = TRUE;
1883 /* Setup an alternate signal stack */
1884 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1885 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1887 g_assert (tls->signal_stack);
1889 sa.ss_sp = tls->signal_stack;
1890 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1892 g_assert (sigaltstack (&sa, NULL) == 0);
1894 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);
1898 mono_free_altstack (MonoJitTlsData *tls)
1903 sa.ss_sp = tls->signal_stack;
1904 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1905 sa.ss_flags = SS_DISABLE;
1906 err = sigaltstack (&sa, NULL);
1907 g_assert (err == 0);
1909 if (tls->signal_stack)
1910 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1911 if (tls->stack_ovf_valloced)
1912 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1914 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1917 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1920 mono_setup_altstack (MonoJitTlsData *tls)
1925 mono_free_altstack (MonoJitTlsData *tls)
1929 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1932 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1934 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1935 /* we need to leave some room for throwing the exception */
1936 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1937 unprotect_size -= mono_pagesize ();
1938 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1939 * is sufficient stack
1941 //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);
1943 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1944 return unprotect_size == jit_tls->stack_ovf_guard_size;
1947 static G_GNUC_UNUSED void
1948 try_more_restore (void)
1950 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1951 if (try_restore_stack_protection (jit_tls, 500))
1952 jit_tls->restore_stack_prot = NULL;
1955 static G_GNUC_UNUSED void
1956 restore_stack_protection (void)
1958 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1959 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1960 /* if we can't restore the stack protection, keep a callback installed so
1961 * we'll try to restore as much stack as we can at each return from unmanaged
1964 if (try_restore_stack_protection (jit_tls, 4096))
1965 jit_tls->restore_stack_prot = NULL;
1967 jit_tls->restore_stack_prot = try_more_restore_tramp;
1968 /* here we also throw a stack overflow exception */
1969 ex->trace_ips = NULL;
1970 ex->stack_trace = NULL;
1971 mono_raise_exception (ex);
1975 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1977 void (*func)(void) = (void (*)(void))tramp_data;
1983 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1988 /* we got a stack overflow in the soft-guard pages
1989 * There are two cases:
1990 * 1) managed code caused the overflow: we unprotect the soft-guard page
1991 * and let the arch-specific code trigger the exception handling mechanism
1992 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1993 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1994 * and hope we can continue with those enabled, at least until the hard-guard page
1995 * is hit. The alternative to continuing here is to just print a message and abort.
1996 * We may add in the future the code to protect the pages again in the codepath
1997 * when we return from unmanaged to managed code.
1999 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2000 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2001 /* we unprotect the minimum amount we can */
2003 gboolean handled = FALSE;
2005 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2006 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2007 guard_size -= mono_pagesize ();
2009 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2010 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2011 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);
2012 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2014 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2019 /* We print a message: after this even managed stack overflows
2020 * may crash the runtime
2022 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2023 if (!jit_tls->handling_stack_ovf) {
2024 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2025 jit_tls->handling_stack_ovf = 1;
2027 /*fprintf (stderr, "Already handling stack overflow\n");*/
2036 MonoMethod *omethod;
2038 } PrintOverflowUserData;
2040 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2042 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2044 MonoMethod *method = NULL;
2045 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2048 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2049 method = jinfo_get_method (frame->ji);
2052 if (user_data->count == 0) {
2053 /* The first frame is in its prolog, so a line number cannot be computed */
2054 user_data->count ++;
2058 /* If this is a one method overflow, skip the other instances */
2059 if (method == user_data->omethod)
2062 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2063 mono_runtime_printf_err (" %s", location);
2066 if (user_data->count == 1) {
2067 mono_runtime_printf_err (" <...>");
2068 user_data->omethod = method;
2070 user_data->omethod = NULL;
2073 user_data->count ++;
2075 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2082 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2084 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2085 PrintOverflowUserData ud;
2089 /* we don't do much now, but we can warn the user with a useful message */
2090 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2092 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2093 mono_sigctx_to_monoctx (ctx, &mctx);
2095 mono_runtime_printf_err ("Stacktrace:");
2097 memset (&ud, 0, sizeof (ud));
2099 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2101 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2102 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2104 mono_runtime_printf_err ("At <unmanaged>.");
2111 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2113 MonoMethod *method = NULL;
2115 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2116 method = jinfo_get_method (frame->ji);
2119 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2120 mono_runtime_printf_err (" %s", location);
2123 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2128 static G_GNUC_UNUSED gboolean
2129 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2131 GString *p = (GString*)data;
2132 MonoMethod *method = NULL;
2134 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2135 method = jinfo_get_method (frame->ji);
2137 if (method && frame->domain) {
2138 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2139 g_string_append_printf (p, " %s\n", location);
2142 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2147 #ifndef MONO_CROSS_COMPILE
2149 static gboolean handling_sigsegv = FALSE;
2152 * mono_handle_native_sigsegv:
2154 * Handle a SIGSEGV received while in native code by printing diagnostic
2155 * information and aborting.
2158 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2160 #ifdef MONO_ARCH_USE_SIGACTION
2161 struct sigaction sa;
2163 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2164 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2166 if (handling_sigsegv)
2169 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2170 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2181 /* To prevent infinite loops when the stack walk causes a crash */
2182 handling_sigsegv = TRUE;
2184 /* !jit_tls means the thread was not registered with the runtime */
2185 if (jit_tls && mono_thread_internal_current ()) {
2186 mono_runtime_printf_err ("Stacktrace:\n");
2188 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2189 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2192 #ifdef HAVE_BACKTRACE_SYMBOLS
2198 mono_runtime_printf_err ("\nNative stacktrace:\n");
2200 size = backtrace (array, 256);
2201 names = backtrace_symbols (array, size);
2202 for (i =0; i < size; ++i) {
2203 mono_runtime_printf_err ("\t%s", names [i]);
2207 /* Try to get more meaningful information using gdb */
2209 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2210 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2211 /* From g_spawn_command_line_sync () in eglib */
2214 pid_t crashed_pid = getpid ();
2218 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2219 * it will deadlock. Call the syscall directly instead.
2221 pid = mono_runtime_syscall_fork ();
2222 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2224 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2225 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2226 // distributions set the scope to 1 which allows attaching only to direct children of
2227 // the current process
2228 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2232 dup2 (STDERR_FILENO, STDOUT_FILENO);
2234 mono_gdb_render_native_backtraces (crashed_pid);
2238 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2239 waitpid (pid, &status, 0);
2243 #elif defined (ENABLE_EXTENSION_MODULE)
2244 mono_extension_handle_native_sigsegv (ctx, info);
2248 * A SIGSEGV indicates something went very wrong so we can no longer depend
2249 * on anything working. So try to print out lots of diagnostics, starting
2250 * with ones which have a greater chance of working.
2252 mono_runtime_printf_err (
2254 "=================================================================\n"
2255 "Got a %s while executing native code. This usually indicates\n"
2256 "a fatal error in the mono runtime or one of the native libraries \n"
2257 "used by your application.\n"
2258 "=================================================================\n",
2262 #ifdef MONO_ARCH_USE_SIGACTION
2264 /* Remove our SIGABRT handler */
2265 sa.sa_handler = SIG_DFL;
2266 sigemptyset (&sa.sa_mask);
2269 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2273 if (!mono_do_crash_chaining) {
2274 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2275 #if defined (PLATFORM_ANDROID)
2286 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2288 g_assert_not_reached ();
2291 #endif /* !MONO_CROSS_COMPILE */
2294 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2296 MonoInternalThread *thread = mono_thread_internal_current ();
2297 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2305 GError *error = NULL;
2310 text = g_string_new (0);
2312 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2314 g_string_append_printf (text, "\n\"%s\"", name);
2317 else if (thread->threadpool_thread)
2318 g_string_append (text, "\n\"<threadpool thread>\"");
2320 g_string_append (text, "\n\"<unnamed thread>\"");
2323 wapi_desc = wapi_current_thread_desc ();
2324 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2328 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2330 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2332 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2334 mono_sigctx_to_monoctx (sigctx, &ctx);
2336 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2338 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2341 mono_runtime_printf ("%s", text->str);
2343 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2344 OutputDebugStringA(text->str);
2347 g_string_free (text, TRUE);
2348 mono_runtime_stdout_fflush ();
2352 * mono_print_thread_dump:
2354 * Print information about the current thread to stdout.
2355 * SIGCTX can be NULL, allowing this to be called from gdb.
2358 mono_print_thread_dump (void *sigctx)
2360 mono_print_thread_dump_internal (sigctx, NULL);
2364 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2366 mono_print_thread_dump_internal (NULL, ctx);
2370 * mono_resume_unwind:
2372 * This is called by a trampoline from LLVM compiled finally clauses to continue
2376 mono_resume_unwind (MonoContext *ctx)
2378 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2379 MonoContext new_ctx;
2381 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2382 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2385 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2387 mono_restore_context (&new_ctx);
2390 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2395 MonoJitExceptionInfo *ei;
2396 } FindHandlerBlockData;
2399 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2403 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2404 MonoJitInfo *ji = frame->ji;
2409 ip = MONO_CONTEXT_GET_IP (ctx);
2411 for (i = 0; i < ji->num_clauses; ++i) {
2412 MonoJitExceptionInfo *ei = ji->clauses + i;
2413 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2415 /*If ip points to the first instruction it means the handler block didn't start
2416 so we can leave its execution to the EH machinery*/
2417 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2429 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2432 MonoJitExceptionInfo *clause = NULL;
2435 ip = MONO_CONTEXT_GET_IP (ctx);
2437 for (i = 0; i < ji->num_clauses; ++i) {
2438 clause = &ji->clauses [i];
2439 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2441 if (clause->handler_start < ip && clause->data.handler_end > ip)
2445 /*no matching finally */
2446 if (i == ji->num_clauses)
2449 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2450 if (ip == clause->handler_start)
2453 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2457 * Finds the bottom handler block running and install a block guard if needed.
2458 * FIXME add full-aot support.
2461 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2463 FindHandlerBlockData data = { 0 };
2464 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2471 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2472 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2474 if (!jit_tls || jit_tls->handler_block_return_address)
2477 /* Do an async safe stack walk */
2478 mono_thread_info_set_is_async_context (TRUE);
2479 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2480 mono_thread_info_set_is_async_context (FALSE);
2485 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2487 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2488 if (resume_ip == NULL)
2491 jit_tls->handler_block_return_address = resume_ip;
2492 jit_tls->handler_block = data.ei;
2499 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2507 mono_set_cast_details (MonoClass *from, MonoClass *to)
2509 MonoJitTlsData *jit_tls = NULL;
2511 if (mini_get_debug_options ()->better_cast_details) {
2512 jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2513 jit_tls->class_cast_from = from;
2514 jit_tls->class_cast_to = to;
2519 /*returns false if the thread is not attached*/
2521 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2523 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2524 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2532 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2534 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2535 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2536 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2539 mono_thread_state_init (ctx);
2542 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2548 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2554 mono_thread_state_init (MonoThreadUnwindState *ctx)
2556 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2558 #if defined(MONO_CROSS_COMPILE)
2559 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2560 #elif MONO_ARCH_HAS_MONO_CONTEXT
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 ? thread->jit_data : NULL;
2574 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2576 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2583 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2584 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2585 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2590 /*returns false if the thread is not attached*/
2592 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2594 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2595 MONO_ARCH_CONTEXT_DEF
2597 mono_arch_flush_register_windows ();
2599 if (!thread || !thread->jit_data) {
2603 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2604 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2606 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2609 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2610 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2611 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2617 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2619 mono_handle_exception (ctx, (MonoObject *)exc);
2620 mono_restore_context (ctx);
2623 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2625 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2627 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2628 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2629 jit_tls->ex_ctx = *ctx;
2631 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2633 g_error ("This target doesn't support mono_arch_setup_async_callback");
2638 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2640 unhandled_exception_hook = func;
2641 unhandled_exception_hook_data = user_data;
2645 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2647 if (unhandled_exception_hook) {
2648 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2650 MonoObject *other = NULL;
2651 MonoString *str = mono_object_to_string (exc, &other);
2655 msg = mono_string_to_utf8 (str);
2657 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2658 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2660 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2661 original_backtrace, nested_backtrace);
2663 g_free (original_backtrace);
2664 g_free (nested_backtrace);
2666 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2668 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2670 #if defined(HOST_IOS)
2671 g_assertion_message ("Terminating runtime due to unhandled exception");
2673 exit (mono_environment_exitcode_get ());
2677 g_assert_not_reached ();
2681 * mono_restore_context:
2683 * Call the architecture specific restore context function.
2686 mono_restore_context (MonoContext *ctx)
2688 static void (*restore_context) (MonoContext *);
2690 if (!restore_context)
2691 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
2692 restore_context (ctx);
2693 g_assert_not_reached ();
2697 * mono_jinfo_get_unwind_info:
2699 * Return the unwind info for JI.
2702 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2705 return mono_aot_get_unwind_info (ji, unwind_info_len);
2707 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2711 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2713 MonoArchEHJitInfo *info;
2715 info = mono_jit_info_get_arch_eh_info (ji);
2718 return info->epilog_size;
2722 * LLVM/Bitcode exception handling.
2725 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2728 static gboolean show_native_addresses = TRUE;
2730 static gboolean show_native_addresses = FALSE;
2733 static _Unwind_Reason_Code
2734 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
2736 MonoDomain *domain = mono_domain_get ();
2737 uintptr_t ip = _Unwind_GetIP (frame_ctx);
2739 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
2740 GList **trace_ips = (GList **)state;
2741 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
2744 return _URC_NO_REASON;
2750 throw_exception (MonoObject *ex, gboolean rethrow)
2752 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2753 MonoException *mono_ex;
2755 if (!mono_object_isinst (ex, mono_defaults.exception_class))
2756 mono_ex = mono_get_exception_runtime_wrapped (ex);
2758 mono_ex = (MonoException*)ex;
2761 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2764 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2765 GList *l, *ips = NULL;
2768 _Unwind_Backtrace (build_stack_trace, &ips);
2769 /* The list contains gshared info-ip pairs */
2771 ips = g_list_reverse (ips);
2772 for (l = ips; l; l = l->next) {
2774 trace = g_list_append (trace, l->data);
2775 trace = g_list_append (trace, NULL);
2777 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace, mono_defaults.int_class));
2779 g_list_free (trace);
2783 mono_llvm_cpp_throw_exception ();
2787 mono_llvm_throw_exception (MonoObject *ex)
2789 throw_exception (ex, FALSE);
2793 mono_llvm_rethrow_exception (MonoObject *ex)
2795 throw_exception (ex, TRUE);
2799 mono_llvm_raise_exception (MonoException *e)
2801 mono_llvm_throw_exception ((MonoObject*)e);
2805 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2807 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2810 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2812 mono_llvm_throw_exception ((MonoObject*)ex);
2816 * mono_llvm_resume_exception:
2818 * Resume exception propagation.
2821 mono_llvm_resume_exception (void)
2823 mono_llvm_cpp_throw_exception ();
2827 * mono_llvm_load_exception:
2829 * Return the currently thrown exception.
2832 mono_llvm_load_exception (void)
2834 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2836 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2838 if (mono_ex->trace_ips) {
2839 GList *trace_ips = NULL;
2840 gpointer ip = __builtin_return_address (0);
2842 size_t upper = mono_array_length (mono_ex->trace_ips);
2844 for (int i = 0; i < upper; i++) {
2845 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2846 trace_ips = g_list_prepend (trace_ips, curr_ip);
2852 // FIXME: Does this work correctly for rethrows?
2853 // We may be discarding useful information
2854 // when this gets GC'ed
2855 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace_ips, mono_defaults.int_class));
2856 g_list_free (trace_ips);
2859 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2861 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new (mono_domain_get (), mono_defaults.int_class, 0));
2862 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new (mono_domain_get (), mono_defaults.stack_frame_class, 0));
2865 return &mono_ex->object;
2869 * mono_llvm_clear_exception:
2871 * Mark the currently thrown exception as handled.
2874 mono_llvm_clear_exception (void)
2876 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2877 mono_gchandle_free (jit_tls->thrown_exc);
2878 jit_tls->thrown_exc = 0;
2880 mono_memory_barrier ();
2884 * mono_llvm_match_exception:
2886 * Return the innermost clause containing REGION_START-REGION_END which can handle
2887 * the current exception.
2890 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
2892 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2896 g_assert (jit_tls->thrown_exc);
2897 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
2898 for (int i = 0; i < jinfo->num_clauses; i++) {
2899 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
2900 MonoClass *catch_class;
2902 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
2905 catch_class = ei->data.catch_class;
2906 if (catch_class->byval_arg.type == MONO_TYPE_VAR || catch_class->byval_arg.type == MONO_TYPE_MVAR || catch_class->byval_arg.type == MONO_TYPE_GENERICINST) {
2907 MonoGenericContext context;
2908 MonoType *inflated_type;
2910 g_assert (rgctx || this_obj);
2911 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
2912 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
2913 catch_class = mono_class_from_mono_type (inflated_type);
2914 mono_metadata_free_type (inflated_type);
2917 // FIXME: Handle edge cases handled in get_exception_catch_class
2918 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (exc, catch_class)) {
2919 index = ei->clause_index;
2921 } else if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2922 g_assert_not_reached ();
2931 mono_debug_personality (int a, _Unwind_Action b,
2932 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
2934 g_assert_not_reached ();
2938 mono_debug_personality (void);
2941 mono_debug_personality (void)
2943 g_assert_not_reached ();