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-internal.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-internal.h>
67 #include "debugger-agent.h"
68 #include "seq-points.h"
69 #include "llvm-runtime.h"
72 #include "mini-llvm-cpp.h"
75 #ifdef ENABLE_EXTENSION_MODULE
76 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
79 #ifndef MONO_ARCH_CONTEXT_DEF
80 #define MONO_ARCH_CONTEXT_DEF
83 static gpointer restore_context_func, call_filter_func;
84 static gpointer throw_exception_func, rethrow_exception_func;
85 static gpointer throw_corlib_exception_func;
87 static gpointer try_more_restore_tramp = NULL;
88 static gpointer restore_stack_protection_tramp = NULL;
90 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
91 static gpointer unhandled_exception_hook_data = NULL;
93 static void try_more_restore (void);
94 static void restore_stack_protection (void);
95 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
96 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
97 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
100 mono_exceptions_init (void)
102 MonoRuntimeExceptionHandlingCallbacks cbs;
104 restore_context_func = mono_aot_get_trampoline ("restore_context");
105 call_filter_func = mono_aot_get_trampoline ("call_filter");
106 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
107 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
111 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
112 mono_tramp_info_register (info, NULL);
113 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
114 mono_tramp_info_register (info, NULL);
115 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
116 mono_tramp_info_register (info, NULL);
117 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
118 mono_tramp_info_register (info, NULL);
120 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
121 if (!mono_llvm_only) {
122 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
123 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
127 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
128 mono_arch_exceptions_init ();
130 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
131 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
134 cbs.mono_raise_exception = mono_llvm_raise_exception;
136 cbs.mono_raise_exception = mono_get_throw_exception ();
137 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
138 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
139 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
140 mono_install_eh_callbacks (&cbs);
144 mono_get_throw_exception (void)
146 g_assert (throw_exception_func);
147 return throw_exception_func;
151 mono_get_rethrow_exception (void)
153 g_assert (rethrow_exception_func);
154 return rethrow_exception_func;
158 mono_get_call_filter (void)
160 g_assert (call_filter_func);
161 return call_filter_func;
165 mono_get_restore_context (void)
167 g_assert (restore_context_func);
168 return restore_context_func;
172 mono_get_throw_corlib_exception (void)
174 gpointer code = NULL;
177 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
178 if (throw_corlib_exception_func)
179 return throw_corlib_exception_func;
182 code = mono_aot_get_trampoline ("throw_corlib_exception");
184 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
185 mono_tramp_info_register (info, NULL);
188 mono_memory_barrier ();
190 throw_corlib_exception_func = code;
192 return throw_corlib_exception_func;
196 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
198 MonoTryBlockHoleTableJitInfo *table;
203 if (ei->try_start > ip || ip >= ei->try_end)
206 if (!ji->has_try_block_holes)
209 table = mono_jit_info_get_try_block_hole_table_info (ji);
210 offset = (guint32)((char*)ip - (char*)ji->code_start);
211 clause = (guint16)(ei - ji->clauses);
212 g_assert (clause < ji->num_clauses);
214 for (i = 0; i < table->num_holes; ++i) {
215 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
216 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
225 * Translate between the mono_arch_unwind_frame function and the old API.
228 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
229 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
231 StackFrameInfo frame;
234 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
236 /* Avoid costly table lookup during stack overflow */
237 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
240 ji = mini_jit_info_table_find (domain, ip, NULL);
245 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
249 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
251 * Remove any unused lmf.
252 * Mask out the lower bits which might be used to hold additional information.
254 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
257 /* Convert between the new and the old APIs */
258 switch (frame.type) {
259 case FRAME_TYPE_MANAGED:
263 case FRAME_TYPE_TRAMPOLINE:
265 case FRAME_TYPE_MANAGED_TO_NATIVE:
269 memset (res, 0, sizeof (MonoJitInfo));
270 res->d.method = frame.method;
273 case FRAME_TYPE_DEBUGGER_INVOKE: {
277 * The normal exception handling code can't handle this frame, so just
280 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
281 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
285 g_assert_not_reached ();
290 /* mono_find_jit_info:
292 * This function is used to gather information from @ctx. It return the
293 * MonoJitInfo of the corresponding function, unwinds one stack frame and
294 * stores the resulting context into @new_ctx. It also stores a string
295 * describing the stack location into @trace (if not NULL), and modifies
296 * the @lmf if necessary. @native_offset return the IP offset from the
297 * start of the function or -1 if that info is not available.
300 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
301 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
305 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
307 MonoMethod *method = NULL;
318 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
320 if (ji == (gpointer)-1)
323 if (ji && !ji->is_trampoline)
324 method = jinfo_get_method (ji);
326 if (managed2 || (method && method->wrapper_type)) {
327 const char *real_ip, *start;
330 start = (const char *)ji->code_start;
332 /* ctx->ip points into native code */
333 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
335 real_ip = (const char*)ip;
337 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
338 offset = real_ip - start;
343 *native_offset = offset;
346 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
350 *trace = mono_debug_print_stack_frame (method, offset, domain);
353 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
354 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
363 * mono_find_jit_info_ext:
365 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
367 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
368 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
369 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
370 * to obtain the last managed frame.
371 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
372 * On return, it will be filled with the locations where callee saved registers are saved
373 * by the current frame. This is returned outside of StackFrameInfo because it can be
374 * quite large on some platforms.
375 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
379 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
380 MonoJitInfo *prev_ji, MonoContext *ctx,
381 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
382 mgreg_t **save_locations,
383 StackFrameInfo *frame)
386 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
388 MonoDomain *target_domain = domain;
389 MonoMethod *method = NULL;
390 gboolean async = mono_thread_info_is_async_context ();
395 /* Avoid costly table lookup during stack overflow */
396 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
399 ji = mini_jit_info_table_find (domain, ip, &target_domain);
402 target_domain = domain;
405 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
407 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
411 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
413 * Remove any unused lmf.
414 * Mask out the lower bits which might be used to hold additional information.
416 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
419 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
420 method = jinfo_get_method (frame->ji);
422 if (frame->type == FRAME_TYPE_MANAGED && method) {
423 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
424 frame->managed = TRUE;
427 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
429 * This type of frame is just a marker, the caller should unwind once more to get the
430 * last managed frame.
433 frame->method = NULL;
436 frame->native_offset = -1;
437 frame->domain = target_domain;
438 frame->async_context = async;
442 if (frame->type == FRAME_TYPE_MANAGED)
443 frame->method = method;
445 if (ji && (frame->managed || (method && method->wrapper_type))) {
446 const char *real_ip, *start;
448 start = (const char *)ji->code_start;
450 /* ctx->ip points into native code */
451 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
453 real_ip = (const char*)ip;
455 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
456 frame->native_offset = real_ip - start;
458 frame->native_offset = -1;
461 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
463 if (trace && frame->method) {
464 char *fname = mono_method_full_name (frame->method, TRUE);
465 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
474 * This function is async-safe.
477 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
479 MonoGenericJitInfo *gi;
483 if (!ji->has_generic_jit_info)
485 gi = mono_jit_info_get_generic_jit_info (ji);
491 * Search location list if available, it contains the precise location of the
492 * argument for every pc offset, even if the method was interrupted while it was in
496 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
499 for (i = 0; i < gi->nlocs; ++i) {
500 MonoDwarfLocListEntry *entry = &gi->locations [i];
502 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
504 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
506 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
510 g_assert (i < gi->nlocs);
513 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
515 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
519 method = jinfo_get_method (ji);
520 if (mono_method_get_context (method)->method_inst) {
522 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
525 /* Avoid returning a managed object */
526 MonoObject *this_obj = info;
528 return this_obj->vtable->klass;
532 static MonoGenericContext
533 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
535 MonoGenericContext context = { NULL, NULL };
536 MonoClass *klass, *method_container_class;
539 g_assert (generic_info);
541 method = jinfo_get_method (ji);
542 g_assert (method->is_inflated);
543 if (mono_method_get_context (method)->method_inst) {
544 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
546 klass = mrgctx->class_vtable->klass;
547 context.method_inst = mrgctx->method_inst;
548 g_assert (context.method_inst);
549 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
550 MonoVTable *vtable = generic_info;
552 klass = vtable->klass;
554 klass = generic_info;
557 //g_assert (!method->klass->generic_container);
558 if (method->klass->generic_class)
559 method_container_class = method->klass->generic_class->container_class;
561 method_container_class = method->klass;
563 /* class might refer to a subclass of method's class */
564 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
565 klass = klass->parent;
569 if (klass->generic_class || klass->generic_container)
570 context.class_inst = mini_class_get_context (klass)->class_inst;
572 if (klass->generic_class)
573 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
575 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
581 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
584 MonoGenericContext context;
587 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
588 return jinfo_get_method (ji);
589 context = get_generic_context_from_stack_frame (ji, generic_info);
591 method = jinfo_get_method (ji);
592 method = mono_method_get_declaring_generic_method (method);
593 method = mono_class_inflate_generic_method_checked (method, &context, &error);
594 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
600 * mono_exception_walk_native_trace:
601 * @ex: The exception object whose frames should be walked
602 * @func: callback to call for each stack frame
603 * @user_data: data passed to the callback
605 * This function walks the stacktrace of an exception. For
606 * each frame the callback function is called with the relevant info.
607 * The walk ends when no more stack frames are found or when the callback
608 * returns a TRUE value.
612 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
614 MonoDomain *domain = mono_domain_get ();
615 MonoArray *ta = ex->trace_ips;
621 len = mono_array_length (ta) >> 1;
622 for (i = 0; i < len; i++) {
623 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
624 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
625 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
628 if (func (NULL, ip, 0, FALSE, user_data))
631 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
632 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
641 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
643 MonoDomain *domain = mono_domain_get ();
645 MonoArray *ta = exc->trace_ips;
646 MonoDebugSourceLocation *location;
650 /* Exception is not thrown yet */
651 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
654 len = mono_array_length (ta) >> 1;
656 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
658 for (i = skip; i < len; i++) {
660 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
661 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
662 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
665 ji = mono_jit_info_table_find (domain, ip);
667 /* Unmanaged frame */
668 mono_array_setref (res, i, sf);
672 g_assert (ji != NULL);
674 method = get_method_from_stack_frame (ji, generic_info);
675 if (jinfo_get_method (ji)->wrapper_type) {
679 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
680 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
684 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
686 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
687 sf->method_address = (gsize) ji->code_start;
688 sf->native_offset = (char *)ip - (char *)ji->code_start;
691 * mono_debug_lookup_source_location() returns both the file / line number information
692 * and the IL offset. Note that computing the IL offset is already an expensive
693 * operation, so we shouldn't call this method twice.
695 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
697 sf->il_offset = location->il_offset;
700 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
701 sf->il_offset = sp.il_offset;
706 if (need_file_info) {
707 if (location && location->source_file) {
708 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
709 sf->line = location->row;
710 sf->column = location->column;
712 sf->line = sf->column = 0;
717 mono_debug_free_source_location (location);
718 mono_array_setref (res, i, sf);
725 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
728 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
729 if (jit_tls && jit_tls->orig_ex_ctx_set)
730 start_ctx = &jit_tls->orig_ex_ctx;
732 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
735 * mono_walk_stack_with_ctx:
737 * Unwind the current thread starting at @start_ctx.
739 * If @start_ctx is null, we capture the current context.
742 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
744 MonoContext extra_ctx;
745 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
746 MONO_ARCH_CONTEXT_DEF
748 if (!thread || !thread->jit_data)
752 mono_arch_flush_register_windows ();
754 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
755 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
757 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
759 start_ctx = &extra_ctx;
762 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
766 * mono_walk_stack_with_state:
768 * Unwind a thread described by @state.
770 * State must be valid (state->valid == TRUE).
772 * If you are using this function to unwind another thread, make sure it is suspended.
774 * If @state is null, we capture the current context.
777 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
779 MonoThreadUnwindState extra_state;
781 g_assert (!mono_thread_info_is_async_context ());
782 if (!mono_thread_state_init_from_current (&extra_state))
784 state = &extra_state;
787 g_assert (state->valid);
789 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
793 mono_walk_stack_full (func,
795 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
796 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
797 state->unwind_data [MONO_UNWIND_DATA_LMF],
798 unwind_options, user_data);
802 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
804 MonoThreadUnwindState state;
805 if (!mono_thread_state_init_from_current (&state))
807 mono_walk_stack_with_state (func, &state, options, user_data);
811 * mono_walk_stack_full:
812 * @func: callback to call for each stack frame
813 * @domain: starting appdomain, can be NULL to use the current domain
814 * @unwind_options: what extra information the unwinder should gather
815 * @start_ctx: starting state of the stack walk, can be NULL.
816 * @thread: the thread whose stack to walk, can be NULL to use the current thread
817 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
818 * @user_data: data passed to the callback
820 * This function walks the stack of a thread, starting from the state
821 * represented by start_ctx. For each frame the callback
822 * function is called with the relevant info. The walk ends when no more
823 * managed stack frames are found or when the callback returns a TRUE value.
826 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
829 MonoContext ctx, new_ctx;
830 StackFrameInfo frame;
832 mgreg_t *reg_locations [MONO_MAX_IREGS];
833 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
834 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
835 gboolean async = mono_thread_info_is_async_context ();
837 g_assert (start_ctx);
840 /*The LMF will be null if the target have no managed frames.*/
841 /* g_assert (lmf); */
844 g_assert (unwind_options == MONO_UNWIND_NONE);
846 memcpy (&ctx, start_ctx, sizeof (MonoContext));
847 memset (reg_locations, 0, sizeof (reg_locations));
849 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
851 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
855 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
856 MonoDebugSourceLocation *source;
858 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
860 il_offset = source->il_offset;
863 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
864 il_offset = sp.il_offset;
868 mono_debug_free_source_location (source);
872 frame.il_offset = il_offset;
874 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
875 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
877 frame.actual_method = frame.method;
880 if (get_reg_locations)
881 frame.reg_locations = reg_locations;
883 if (func (&frame, &ctx, user_data))
886 if (get_reg_locations) {
887 for (i = 0; i < MONO_MAX_IREGS; ++i)
888 if (new_reg_locations [i])
889 reg_locations [i] = new_reg_locations [i];
897 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
898 MonoReflectionMethod **method,
899 gint32 *iloffset, gint32 *native_offset,
900 MonoString **file, gint32 *line, gint32 *column)
902 MonoDomain *domain = mono_domain_get ();
903 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
904 MonoLMF *lmf = mono_get_lmf ();
905 MonoJitInfo *ji = NULL;
906 MonoContext ctx, new_ctx;
907 MonoDebugSourceLocation *location;
908 MonoMethod *jmethod = NULL, *actual_method;
909 StackFrameInfo frame;
912 MONO_ARCH_CONTEXT_DEF;
914 mono_arch_flush_register_windows ();
916 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
917 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
919 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
925 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
929 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
930 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
931 frame.type == FRAME_TYPE_TRAMPOLINE)
935 *native_offset = frame.native_offset;
937 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
938 jmethod = jinfo_get_method (ji);
939 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
944 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
946 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
948 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
950 *iloffset = location->il_offset;
954 if (need_file_info) {
956 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
957 *line = location->row;
958 *column = location->column;
965 mono_debug_free_source_location (location);
971 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
973 MonoClass *catch_class = ei->data.catch_class;
974 MonoType *inflated_type;
975 MonoGenericContext context;
977 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
978 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
981 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
983 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
985 /* FIXME: we shouldn't inflate but instead put the
986 type in the rgctx and fetch it from there. It
987 might be a good idea to do this lazily, i.e. only
988 when the exception is actually thrown, so as not to
989 waste space for exception clauses which might never
991 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
992 catch_class = mono_class_from_mono_type (inflated_type);
993 mono_metadata_free_type (inflated_type);
999 * mini_jit_info_table_find_ext:
1001 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1002 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1003 * OUT_DOMAIN if it is not NULL.
1006 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1009 MonoInternalThread *t = mono_thread_internal_current ();
1015 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1018 *out_domain = domain;
1022 /* maybe it is shared code, so we also search in the root domain */
1023 if (domain != mono_get_root_domain ()) {
1024 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1027 *out_domain = mono_get_root_domain ();
1035 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1036 for (; refs && *refs; refs++) {
1037 if (*refs != domain && *refs != mono_get_root_domain ()) {
1038 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1041 *out_domain = (MonoDomain*) *refs;
1051 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1053 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1057 * wrap_non_exception_throws:
1059 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1060 * WrapNonExceptionThrows flag set.
1063 wrap_non_exception_throws (MonoMethod *m)
1065 MonoAssembly *ass = m->klass->image->assembly;
1066 MonoCustomAttrInfo* attrs;
1067 static MonoClass *klass;
1069 gboolean val = FALSE;
1072 if (ass->wrap_non_exception_throws_inited)
1073 return ass->wrap_non_exception_throws;
1075 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1077 attrs = mono_custom_attrs_from_assembly (ass);
1079 for (i = 0; i < attrs->num_attrs; ++i) {
1080 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1082 int num_named, named_type, name_len;
1085 if (!attr->ctor || attr->ctor->klass != klass)
1087 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1088 p = (const char*)attr->data;
1089 g_assert (read16 (p) == 0x0001);
1091 num_named = read16 (p);
1097 /* data_type = *p; */
1100 if (named_type != 0x54)
1102 name_len = mono_metadata_decode_blob_size (p, &p);
1103 name = g_malloc (name_len + 1);
1104 memcpy (name, p, name_len);
1105 name [name_len] = 0;
1107 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1109 /* The value is a BOOLEAN */
1112 mono_custom_attrs_free (attrs);
1115 ass->wrap_non_exception_throws = val;
1116 mono_memory_barrier ();
1117 ass->wrap_non_exception_throws_inited = TRUE;
1122 #ifndef MONO_ARCH_STACK_GROWS_UP
1123 #define DOES_STACK_GROWS_UP 1
1125 #define DOES_STACK_GROWS_UP 0
1128 #define MAX_UNMANAGED_BACKTRACE 128
1130 build_native_trace (void)
1132 /* This puppy only makes sense on mobile, IOW, ARM. */
1133 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1135 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1136 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1141 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1143 for (i = 0; i < size; i++)
1144 mono_array_set (res, gpointer, i, native_trace [i]);
1152 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1154 if (mono_ex && !initial_trace_ips) {
1155 *trace_ips = g_list_reverse (*trace_ips);
1156 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (*trace_ips, mono_defaults.int_class));
1157 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1158 if (dynamic_methods) {
1159 /* These methods could go away anytime, so save a reference to them in the exception object */
1161 MonoMList *list = NULL;
1163 for (l = dynamic_methods; l; l = l->next) {
1165 MonoDomain *domain = mono_domain_get ();
1167 if (domain->method_to_dyn_method) {
1168 mono_domain_lock (domain);
1169 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1170 mono_domain_unlock (domain);
1172 MonoObject *o = mono_gchandle_get_target (dis_link);
1174 list = mono_mlist_prepend (list, o);
1180 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1183 g_list_free (*trace_ips);
1188 * mono_handle_exception_internal_first_pass:
1190 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1191 * OBJ is found. Run the index of the filter clause which caught the exception into
1192 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1195 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1197 MonoDomain *domain = mono_domain_get ();
1198 MonoJitInfo *ji = NULL;
1199 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1200 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1201 MonoLMF *lmf = mono_get_lmf ();
1202 MonoArray *initial_trace_ips = NULL;
1203 GList *trace_ips = NULL;
1204 GSList *dynamic_methods = NULL;
1205 MonoException *mono_ex;
1206 gboolean stack_overflow = FALSE;
1207 MonoContext initial_ctx;
1209 int frame_count = 0;
1214 g_assert (ctx != NULL);
1216 if (obj == domain->stack_overflow_ex)
1217 stack_overflow = TRUE;
1219 mono_ex = (MonoException*)obj;
1220 initial_trace_ips = mono_ex->trace_ips;
1222 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1223 mono_ex = (MonoException*)obj;
1224 initial_trace_ips = mono_ex->trace_ips;
1230 call_filter = mono_get_call_filter ();
1232 g_assert (jit_tls->end_of_stack);
1233 g_assert (jit_tls->abort_func);
1236 *out_filter_idx = -1;
1240 *out_prev_ji = NULL;
1245 MonoContext new_ctx;
1247 int clause_index_start = 0;
1248 gboolean unwind_res = TRUE;
1250 StackFrameInfo frame;
1255 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1257 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1258 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1259 frame.type == FRAME_TYPE_TRAMPOLINE) {
1263 g_assert (frame.type == FRAME_TYPE_MANAGED);
1268 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1269 g_slist_free (dynamic_methods);
1274 method = jinfo_get_method (ji);
1275 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1277 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1278 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1279 "The native frame called the managed method:\n%s\n",
1280 mono_method_full_name (method, TRUE));
1283 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1285 * Avoid overwriting the stack trace if the exception is
1286 * rethrown. Also avoid giant stack traces during a stack
1289 if (!initial_trace_ips && (frame_count < 1000)) {
1290 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1291 trace_ips = g_list_prepend (trace_ips,
1292 get_generic_info_from_stack_frame (ji, ctx));
1296 if (method->dynamic)
1297 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1299 if (stack_overflow) {
1300 if (DOES_STACK_GROWS_UP)
1301 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1303 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1305 free_stack = 0xffffff;
1308 for (i = clause_index_start; i < ji->num_clauses; i++) {
1309 MonoJitExceptionInfo *ei = &ji->clauses [i];
1310 gboolean filtered = FALSE;
1313 * During stack overflow, wait till the unwinding frees some stack
1314 * space before running handlers/finalizers.
1316 if (free_stack <= (64 * 1024))
1319 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1321 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1324 * Have to unwrap RuntimeWrappedExceptions if the
1325 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1327 if (non_exception && !wrap_non_exception_throws (method))
1328 ex_obj = non_exception;
1332 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1333 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1334 #ifndef DISABLE_PERFCOUNTERS
1335 mono_perfcounters->exceptions_filters++;
1338 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1339 trim the stackframe since if it returns FALSE we lose information.
1341 FIXME Not 100% sure if it's a good idea even with user clauses.
1344 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1346 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1348 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1350 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1351 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1353 g_assert (!ji->from_llvm);
1354 /* store the exception object in bp + ei->exvar_offset */
1355 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1358 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1360 * Pass the original il clause index to the landing pad so it can
1361 * branch to the landing pad associated with the il clause.
1362 * This is needed because llvm compiled code assumes that the EH
1363 * code always branches to the innermost landing pad.
1366 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1369 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1370 filtered = call_filter (ctx, ei->data.filter);
1371 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1372 if (filtered && out_filter_idx)
1373 *out_filter_idx = filter_idx;
1380 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1381 g_slist_free (dynamic_methods);
1382 /* mono_debugger_agent_handle_exception () needs this */
1383 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1388 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1389 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1390 g_slist_free (dynamic_methods);
1395 /* mono_debugger_agent_handle_exception () needs this */
1396 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1405 g_assert_not_reached ();
1409 * mono_handle_exception_internal:
1410 * @ctx: saved processor state
1411 * @obj: the exception object
1412 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1415 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1417 MonoDomain *domain = mono_domain_get ();
1418 MonoJitInfo *ji, *prev_ji;
1419 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1420 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1421 MonoLMF *lmf = mono_get_lmf ();
1422 MonoException *mono_ex;
1423 gboolean stack_overflow = FALSE;
1424 MonoContext initial_ctx;
1426 int frame_count = 0;
1427 gint32 filter_idx, first_filter_idx = 0;
1430 MonoObject *non_exception = NULL;
1432 g_assert (ctx != NULL);
1434 MonoException *ex = mono_get_exception_null_reference ();
1435 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1436 obj = (MonoObject *)ex;
1440 * Allocate a new exception object instead of the preconstructed ones.
1442 if (obj == domain->stack_overflow_ex) {
1444 * It is not a good idea to try and put even more pressure on the little stack available.
1445 * obj = mono_get_exception_stack_overflow ();
1447 stack_overflow = TRUE;
1449 else if (obj == domain->null_reference_ex) {
1450 obj = mono_get_exception_null_reference ();
1453 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1454 non_exception = obj;
1455 obj = mono_get_exception_runtime_wrapped (obj);
1458 mono_ex = (MonoException*)obj;
1460 if (mini_get_debug_options ()->suspend_on_exception) {
1461 mono_runtime_printf_err ("Exception thrown, suspending...");
1466 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1467 mono_ex = (MonoException*)obj;
1472 if (mono_ex && jit_tls->class_cast_from) {
1473 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1474 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1475 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1476 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1477 mono_ex->message = mono_string_new (domain, msg);
1482 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1483 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1484 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1485 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1486 mono_ex->message = mono_string_new (domain, msg);
1494 call_filter = mono_get_call_filter ();
1496 g_assert (jit_tls->end_of_stack);
1497 g_assert (jit_tls->abort_func);
1500 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1501 * end up being TRUE on any code path.
1503 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1508 MonoContext ctx_cp = *ctx;
1509 if (mono_trace_is_enabled ()) {
1510 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1511 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1512 MonoObject *message;
1513 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1515 MonoObject *exc = NULL;
1516 if (get_message == NULL) {
1518 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1520 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1522 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1526 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1528 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);
1530 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1531 mono_print_thread_dump_from_ctx (ctx);
1533 jit_tls->orig_ex_ctx_set = TRUE;
1534 mono_profiler_exception_thrown (obj);
1535 jit_tls->orig_ex_ctx_set = FALSE;
1537 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1540 if (mini_get_debug_options ()->break_on_exc)
1542 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1544 if (mini_get_debug_options ()->suspend_on_unhandled) {
1545 mono_runtime_printf_err ("Unhandled exception, suspending...");
1550 // FIXME: This runs managed code so it might cause another stack overflow when
1551 // we are handling a stack overflow
1552 mono_unhandled_exception (obj);
1554 gboolean unhandled = FALSE;
1557 * The exceptions caught by the mono_runtime_invoke () calls
1558 * in the threadpool needs to be treated as unhandled (#669836).
1560 * FIXME: The check below is hackish, but its hard to distinguish
1561 * these runtime invoke calls from others in the runtime.
1563 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1564 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1569 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1571 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1581 MonoContext new_ctx;
1583 int clause_index_start = 0;
1584 gboolean unwind_res = TRUE;
1588 ji = jit_tls->resume_state.ji;
1589 new_ctx = jit_tls->resume_state.new_ctx;
1590 clause_index_start = jit_tls->resume_state.clause_index;
1591 lmf = jit_tls->resume_state.lmf;
1592 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1593 filter_idx = jit_tls->resume_state.filter_idx;
1595 StackFrameInfo frame;
1597 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1599 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1600 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1601 frame.type == FRAME_TYPE_TRAMPOLINE) {
1605 g_assert (frame.type == FRAME_TYPE_MANAGED);
1611 *(mono_get_lmf_addr ()) = lmf;
1613 jit_tls->abort_func (obj);
1614 g_assert_not_reached ();
1617 method = jinfo_get_method (ji);
1619 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1621 if (stack_overflow) {
1622 if (DOES_STACK_GROWS_UP)
1623 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1625 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1627 free_stack = 0xffffff;
1630 for (i = clause_index_start; i < ji->num_clauses; i++) {
1631 MonoJitExceptionInfo *ei = &ji->clauses [i];
1632 gboolean filtered = FALSE;
1635 * During stack overflow, wait till the unwinding frees some stack
1636 * space before running handlers/finalizers.
1638 if (free_stack <= (64 * 1024))
1641 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1643 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1646 * Have to unwrap RuntimeWrappedExceptions if the
1647 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1649 if (non_exception && !wrap_non_exception_throws (method))
1650 ex_obj = non_exception;
1654 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1655 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1656 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1658 g_assert (!ji->from_llvm);
1659 /* store the exception object in bp + ei->exvar_offset */
1660 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1664 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1666 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1669 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1671 * Filter clauses should only be run in the
1672 * first pass of exception handling.
1674 filtered = (filter_idx == first_filter_idx);
1678 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1679 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1681 * This guards against the situation that we abort a thread that is executing a finally clause
1682 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1683 * check for this situation here and resume interruption if we are below the guarded block.
1685 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1686 gboolean is_outside = FALSE;
1687 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1688 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1689 //FIXME make this stack direction aware
1690 if (catch_bp > prot_bp) {
1692 } else if (catch_bp == prot_bp) {
1693 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1694 * So we check if the catch handler_start is protected by the guarded handler protected region
1697 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1698 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1699 * There aren't any further finally/fault handler blocks down the stack over this exception.
1700 * This must be ensured by the code that installs the guard trampoline.
1702 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1704 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1709 jit_tls->handler_block_return_address = NULL;
1710 jit_tls->handler_block = NULL;
1711 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1715 if (mono_trace_is_enabled () && mono_trace_eval (method))
1716 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1717 jit_tls->orig_ex_ctx_set = TRUE;
1718 mono_profiler_exception_clause_handler (method, ei->flags, i);
1719 jit_tls->orig_ex_ctx_set = FALSE;
1720 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1722 #ifndef DISABLE_PERFCOUNTERS
1723 mono_perfcounters->exceptions_depth += frame_count;
1725 if (obj == domain->stack_overflow_ex)
1726 jit_tls->handling_stack_ovf = FALSE;
1730 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1731 if (mono_trace_is_enabled () && mono_trace_eval (method))
1732 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1733 jit_tls->orig_ex_ctx_set = TRUE;
1734 mono_profiler_exception_clause_handler (method, ei->flags, i);
1735 jit_tls->orig_ex_ctx_set = FALSE;
1736 call_filter (ctx, ei->handler_start);
1738 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1739 if (mono_trace_is_enabled () && mono_trace_eval (method))
1740 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1741 jit_tls->orig_ex_ctx_set = TRUE;
1742 mono_profiler_exception_clause_handler (method, ei->flags, i);
1743 jit_tls->orig_ex_ctx_set = FALSE;
1744 #ifndef DISABLE_PERFCOUNTERS
1745 mono_perfcounters->exceptions_finallys++;
1748 if (ji->from_llvm) {
1750 * LLVM compiled finally handlers follow the design
1751 * of the c++ ehabi, i.e. they call a resume function
1752 * at the end instead of returning to the caller.
1753 * So save the exception handling state,
1754 * mono_resume_unwind () will call us again to continue
1757 jit_tls->resume_state.ex_obj = obj;
1758 jit_tls->resume_state.ji = ji;
1759 jit_tls->resume_state.clause_index = i + 1;
1760 jit_tls->resume_state.ctx = *ctx;
1761 jit_tls->resume_state.new_ctx = new_ctx;
1762 jit_tls->resume_state.lmf = lmf;
1763 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1764 jit_tls->resume_state.filter_idx = filter_idx;
1765 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1768 call_filter (ctx, ei->handler_start);
1774 jit_tls->orig_ex_ctx_set = TRUE;
1775 mono_profiler_exception_method_leave (method);
1776 jit_tls->orig_ex_ctx_set = FALSE;
1781 g_assert_not_reached ();
1785 * mono_debugger_run_finally:
1786 * @start_ctx: saved processor state
1788 * This method is called by the Mono Debugger to call all `finally' clauses of the
1789 * current stack frame. It's used when the user issues a `return' command to make
1790 * the current stack frame return. After returning from this method, the debugger
1791 * unwinds the stack one frame and gives control back to the user.
1793 * NOTE: This method is only used when running inside the Mono Debugger.
1796 mono_debugger_run_finally (MonoContext *start_ctx)
1798 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1799 MonoDomain *domain = mono_domain_get ();
1800 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1801 MonoLMF *lmf = mono_get_lmf ();
1802 MonoContext ctx, new_ctx;
1803 MonoJitInfo *ji, rji;
1808 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1809 if (!ji || ji == (gpointer)-1)
1813 call_filter = mono_get_call_filter ();
1815 for (i = 0; i < ji->num_clauses; i++) {
1816 MonoJitExceptionInfo *ei = &ji->clauses [i];
1818 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1819 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1820 call_filter (&ctx, ei->handler_start);
1826 * mono_handle_exception:
1827 * @ctx: saved processor state
1828 * @obj: the exception object
1831 mono_handle_exception (MonoContext *ctx, gpointer obj)
1833 #ifndef DISABLE_PERFCOUNTERS
1834 mono_perfcounters->exceptions_thrown++;
1837 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1840 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1842 #ifndef MONO_ARCH_USE_SIGACTION
1843 #error "Can't use sigaltstack without sigaction"
1846 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1849 mono_setup_altstack (MonoJitTlsData *tls)
1853 guint8 *staddr = NULL;
1855 if (mono_running_on_valgrind ())
1858 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1862 tls->end_of_stack = staddr + stsize;
1863 tls->stack_size = stsize;
1865 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1867 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1868 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1870 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1872 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1873 /* mprotect can fail for the main thread stack */
1874 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);
1875 g_assert (gaddr == tls->stack_ovf_guard_base);
1876 tls->stack_ovf_valloced = TRUE;
1879 /* Setup an alternate signal stack */
1880 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1881 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1883 g_assert (tls->signal_stack);
1885 sa.ss_sp = tls->signal_stack;
1886 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1888 g_assert (sigaltstack (&sa, NULL) == 0);
1890 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);
1894 mono_free_altstack (MonoJitTlsData *tls)
1899 sa.ss_sp = tls->signal_stack;
1900 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1901 sa.ss_flags = SS_DISABLE;
1902 err = sigaltstack (&sa, NULL);
1903 g_assert (err == 0);
1905 if (tls->signal_stack)
1906 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1907 if (tls->stack_ovf_valloced)
1908 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1910 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1913 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1916 mono_setup_altstack (MonoJitTlsData *tls)
1921 mono_free_altstack (MonoJitTlsData *tls)
1925 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1928 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1930 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1931 /* we need to leave some room for throwing the exception */
1932 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1933 unprotect_size -= mono_pagesize ();
1934 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1935 * is sufficient stack
1937 //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);
1939 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1940 return unprotect_size == jit_tls->stack_ovf_guard_size;
1943 static G_GNUC_UNUSED void
1944 try_more_restore (void)
1946 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1947 if (try_restore_stack_protection (jit_tls, 500))
1948 jit_tls->restore_stack_prot = NULL;
1951 static G_GNUC_UNUSED void
1952 restore_stack_protection (void)
1954 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1955 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1956 /* if we can't restore the stack protection, keep a callback installed so
1957 * we'll try to restore as much stack as we can at each return from unmanaged
1960 if (try_restore_stack_protection (jit_tls, 4096))
1961 jit_tls->restore_stack_prot = NULL;
1963 jit_tls->restore_stack_prot = try_more_restore_tramp;
1964 /* here we also throw a stack overflow exception */
1965 ex->trace_ips = NULL;
1966 ex->stack_trace = NULL;
1967 mono_raise_exception (ex);
1971 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1973 void (*func)(void) = (gpointer)tramp_data;
1979 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1984 /* we got a stack overflow in the soft-guard pages
1985 * There are two cases:
1986 * 1) managed code caused the overflow: we unprotect the soft-guard page
1987 * and let the arch-specific code trigger the exception handling mechanism
1988 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1989 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1990 * and hope we can continue with those enabled, at least until the hard-guard page
1991 * is hit. The alternative to continuing here is to just print a message and abort.
1992 * We may add in the future the code to protect the pages again in the codepath
1993 * when we return from unmanaged to managed code.
1995 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1996 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1997 /* we unprotect the minimum amount we can */
1999 gboolean handled = FALSE;
2001 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2002 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2003 guard_size -= mono_pagesize ();
2005 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2006 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2007 mono_mprotect ((char*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size - guard_size, guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2008 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2010 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2015 /* We print a message: after this even managed stack overflows
2016 * may crash the runtime
2018 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2019 if (!jit_tls->handling_stack_ovf) {
2020 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2021 jit_tls->handling_stack_ovf = 1;
2023 /*fprintf (stderr, "Already handling stack overflow\n");*/
2032 MonoMethod *omethod;
2034 } PrintOverflowUserData;
2036 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2038 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2040 MonoMethod *method = NULL;
2041 PrintOverflowUserData *user_data = data;
2044 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2045 method = jinfo_get_method (frame->ji);
2048 if (user_data->count == 0) {
2049 /* The first frame is in its prolog, so a line number cannot be computed */
2050 user_data->count ++;
2054 /* If this is a one method overflow, skip the other instances */
2055 if (method == user_data->omethod)
2058 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2059 mono_runtime_printf_err (" %s", location);
2062 if (user_data->count == 1) {
2063 mono_runtime_printf_err (" <...>");
2064 user_data->omethod = method;
2066 user_data->omethod = NULL;
2069 user_data->count ++;
2071 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2078 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2080 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2081 PrintOverflowUserData ud;
2085 /* we don't do much now, but we can warn the user with a useful message */
2086 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2088 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2089 mono_sigctx_to_monoctx (ctx, &mctx);
2091 mono_runtime_printf_err ("Stacktrace:");
2093 memset (&ud, 0, sizeof (ud));
2095 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2097 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2098 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2100 mono_runtime_printf_err ("At <unmanaged>.");
2107 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2109 MonoMethod *method = NULL;
2111 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2112 method = jinfo_get_method (frame->ji);
2115 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2116 mono_runtime_printf_err (" %s", location);
2119 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2124 static G_GNUC_UNUSED gboolean
2125 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2127 GString *p = (GString*)data;
2128 MonoMethod *method = NULL;
2130 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2131 method = jinfo_get_method (frame->ji);
2133 if (method && frame->domain) {
2134 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2135 g_string_append_printf (p, " %s\n", location);
2138 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2143 #ifndef MONO_CROSS_COMPILE
2145 static gboolean handling_sigsegv = FALSE;
2148 * mono_handle_native_sigsegv:
2150 * Handle a SIGSEGV received while in native code by printing diagnostic
2151 * information and aborting.
2154 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2156 #ifdef MONO_ARCH_USE_SIGACTION
2157 struct sigaction sa;
2159 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2160 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2162 if (handling_sigsegv)
2165 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2166 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2177 /* To prevent infinite loops when the stack walk causes a crash */
2178 handling_sigsegv = TRUE;
2180 /* !jit_tls means the thread was not registered with the runtime */
2181 if (jit_tls && mono_thread_internal_current ()) {
2182 mono_runtime_printf_err ("Stacktrace:\n");
2184 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2187 #ifdef HAVE_BACKTRACE_SYMBOLS
2193 mono_runtime_printf_err ("\nNative stacktrace:\n");
2195 size = backtrace (array, 256);
2196 names = backtrace_symbols (array, size);
2197 for (i =0; i < size; ++i) {
2198 mono_runtime_printf_err ("\t%s", names [i]);
2202 /* Try to get more meaningful information using gdb */
2204 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2205 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2206 /* From g_spawn_command_line_sync () in eglib */
2209 pid_t crashed_pid = getpid ();
2213 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2214 * it will deadlock. Call the syscall directly instead.
2216 pid = mono_runtime_syscall_fork ();
2217 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2219 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2220 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2221 // distributions set the scope to 1 which allows attaching only to direct children of
2222 // the current process
2223 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2227 dup2 (STDERR_FILENO, STDOUT_FILENO);
2229 mono_gdb_render_native_backtraces (crashed_pid);
2233 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2234 waitpid (pid, &status, 0);
2238 #elif defined (ENABLE_EXTENSION_MODULE)
2239 mono_extension_handle_native_sigsegv (ctx, info);
2243 * A SIGSEGV indicates something went very wrong so we can no longer depend
2244 * on anything working. So try to print out lots of diagnostics, starting
2245 * with ones which have a greater chance of working.
2247 mono_runtime_printf_err (
2249 "=================================================================\n"
2250 "Got a %s while executing native code. This usually indicates\n"
2251 "a fatal error in the mono runtime or one of the native libraries \n"
2252 "used by your application.\n"
2253 "=================================================================\n",
2257 #ifdef MONO_ARCH_USE_SIGACTION
2259 /* Remove our SIGABRT handler */
2260 sa.sa_handler = SIG_DFL;
2261 sigemptyset (&sa.sa_mask);
2264 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2268 if (!mono_do_crash_chaining) {
2269 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2270 #if defined (PLATFORM_ANDROID)
2281 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2283 g_assert_not_reached ();
2286 #endif /* !MONO_CROSS_COMPILE */
2289 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2291 MonoInternalThread *thread = mono_thread_internal_current ();
2292 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2300 GError *error = NULL;
2305 text = g_string_new (0);
2307 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2309 g_string_append_printf (text, "\n\"%s\"", name);
2312 else if (thread->threadpool_thread)
2313 g_string_append (text, "\n\"<threadpool thread>\"");
2315 g_string_append (text, "\n\"<unnamed thread>\"");
2318 wapi_desc = wapi_current_thread_desc ();
2319 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2323 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2325 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2327 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2329 mono_sigctx_to_monoctx (sigctx, &ctx);
2331 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2333 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2336 mono_runtime_printf ("%s", text->str);
2338 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2339 OutputDebugStringA(text->str);
2342 g_string_free (text, TRUE);
2343 mono_runtime_stdout_fflush ();
2347 * mono_print_thread_dump:
2349 * Print information about the current thread to stdout.
2350 * SIGCTX can be NULL, allowing this to be called from gdb.
2353 mono_print_thread_dump (void *sigctx)
2355 mono_print_thread_dump_internal (sigctx, NULL);
2359 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2361 mono_print_thread_dump_internal (NULL, ctx);
2365 * mono_resume_unwind:
2367 * This is called by a trampoline from LLVM compiled finally clauses to continue
2371 mono_resume_unwind (MonoContext *ctx)
2373 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2374 MonoContext new_ctx;
2376 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2377 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2380 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2382 mono_restore_context (&new_ctx);
2385 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2390 MonoJitExceptionInfo *ei;
2391 } FindHandlerBlockData;
2394 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2398 FindHandlerBlockData *pdata = data;
2399 MonoJitInfo *ji = frame->ji;
2404 ip = MONO_CONTEXT_GET_IP (ctx);
2406 for (i = 0; i < ji->num_clauses; ++i) {
2407 MonoJitExceptionInfo *ei = ji->clauses + i;
2408 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2410 /*If ip points to the first instruction it means the handler block didn't start
2411 so we can leave its execution to the EH machinery*/
2412 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2424 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2427 MonoJitExceptionInfo *clause = NULL;
2430 ip = MONO_CONTEXT_GET_IP (ctx);
2432 for (i = 0; i < ji->num_clauses; ++i) {
2433 clause = &ji->clauses [i];
2434 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2436 if (clause->handler_start < ip && clause->data.handler_end > ip)
2440 /*no matching finally */
2441 if (i == ji->num_clauses)
2444 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2445 if (ip == clause->handler_start)
2448 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2452 * Finds the bottom handler block running and install a block guard if needed.
2453 * FIXME add full-aot support.
2456 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2458 FindHandlerBlockData data = { 0 };
2459 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2466 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2467 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2469 if (!jit_tls || jit_tls->handler_block_return_address)
2472 /* Do an async safe stack walk */
2473 mono_thread_info_set_is_async_context (TRUE);
2474 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2475 mono_thread_info_set_is_async_context (FALSE);
2480 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2482 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2483 if (resume_ip == NULL)
2486 jit_tls->handler_block_return_address = resume_ip;
2487 jit_tls->handler_block = data.ei;
2494 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2502 mono_set_cast_details (MonoClass *from, MonoClass *to)
2504 MonoJitTlsData *jit_tls = NULL;
2506 if (mini_get_debug_options ()->better_cast_details) {
2507 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2508 jit_tls->class_cast_from = from;
2509 jit_tls->class_cast_to = to;
2514 /*returns false if the thread is not attached*/
2516 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2518 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2519 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2527 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2529 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2530 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2531 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2534 mono_thread_state_init (ctx);
2537 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2543 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2549 mono_thread_state_init (MonoThreadUnwindState *ctx)
2551 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2553 #if defined(MONO_CROSS_COMPILE)
2554 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2555 #elif MONO_ARCH_HAS_MONO_CONTEXT
2556 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2558 g_error ("Use a null sigctx requires a working mono-context");
2561 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2562 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2563 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2569 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2571 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2578 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2579 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2580 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2585 /*returns false if the thread is not attached*/
2587 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2589 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2590 MONO_ARCH_CONTEXT_DEF
2592 mono_arch_flush_register_windows ();
2594 if (!thread || !thread->jit_data) {
2598 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2599 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2601 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2604 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2605 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2606 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2612 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2614 mono_handle_exception (ctx, exc);
2615 mono_restore_context (ctx);
2618 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2620 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2622 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2623 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2624 jit_tls->ex_ctx = *ctx;
2626 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2628 g_error ("This target doesn't support mono_arch_setup_async_callback");
2633 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2635 unhandled_exception_hook = func;
2636 unhandled_exception_hook_data = user_data;
2640 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2642 if (unhandled_exception_hook) {
2643 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2645 MonoObject *other = NULL;
2646 MonoString *str = mono_object_to_string (exc, &other);
2650 msg = mono_string_to_utf8 (str);
2652 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2653 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2655 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2656 original_backtrace, nested_backtrace);
2658 g_free (original_backtrace);
2659 g_free (nested_backtrace);
2661 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2663 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2665 #if defined(HOST_IOS)
2666 g_assertion_message ("Terminating runtime due to unhandled exception");
2668 exit (mono_environment_exitcode_get ());
2672 g_assert_not_reached ();
2676 * mono_restore_context:
2678 * Call the architecture specific restore context function.
2681 mono_restore_context (MonoContext *ctx)
2683 static void (*restore_context) (MonoContext *);
2685 if (!restore_context)
2686 restore_context = mono_get_restore_context ();
2687 restore_context (ctx);
2688 g_assert_not_reached ();
2692 * mono_jinfo_get_unwind_info:
2694 * Return the unwind info for JI.
2697 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2700 return mono_aot_get_unwind_info (ji, unwind_info_len);
2702 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2706 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2708 MonoArchEHJitInfo *info;
2710 info = mono_jit_info_get_arch_eh_info (ji);
2713 return info->epilog_size;
2717 * LLVM/Bitcode exception handling.
2720 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2723 static gboolean show_native_addresses = TRUE;
2725 static gboolean show_native_addresses = FALSE;
2728 static _Unwind_Reason_Code
2729 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
2731 MonoDomain *domain = mono_domain_get ();
2732 uintptr_t ip = _Unwind_GetIP (frame_ctx);
2734 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
2735 GList **trace_ips = (GList **)state;
2736 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
2739 return _URC_NO_REASON;
2745 throw_exception (MonoObject *ex, gboolean rethrow)
2747 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2748 MonoException *mono_ex;
2750 if (!mono_object_isinst (ex, mono_defaults.exception_class))
2751 mono_ex = mono_get_exception_runtime_wrapped (ex);
2753 mono_ex = (MonoException*)ex;
2756 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2759 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2760 GList *l, *ips = NULL;
2763 _Unwind_Backtrace (build_stack_trace, &ips);
2764 /* The list contains gshared info-ip pairs */
2766 ips = g_list_reverse (ips);
2767 for (l = ips; l; l = l->next) {
2769 trace = g_list_append (trace, l->data);
2770 trace = g_list_append (trace, NULL);
2772 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace, mono_defaults.int_class));
2774 g_list_free (trace);
2778 mono_llvm_cpp_throw_exception ();
2782 mono_llvm_throw_exception (MonoObject *ex)
2784 throw_exception (ex, FALSE);
2788 mono_llvm_rethrow_exception (MonoObject *ex)
2790 throw_exception (ex, TRUE);
2794 mono_llvm_raise_exception (MonoException *e)
2796 mono_llvm_throw_exception ((MonoObject*)e);
2800 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2802 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2805 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2807 mono_llvm_throw_exception ((MonoObject*)ex);
2811 * mono_llvm_resume_exception:
2813 * Resume exception propagation.
2816 mono_llvm_resume_exception (void)
2818 mono_llvm_cpp_throw_exception ();
2822 * mono_llvm_load_exception:
2824 * Return the currently thrown exception.
2827 mono_llvm_load_exception (void)
2829 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2831 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2832 g_assert (mono_ex->trace_ips);
2834 GList *trace_ips = NULL;
2835 gpointer ip = __builtin_return_address (0);
2837 size_t upper = mono_array_length (mono_ex->trace_ips);
2839 for (int i = 0; i < upper; i++) {
2840 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2841 trace_ips = g_list_prepend (trace_ips, curr_ip);
2847 // FIXME: Does this work correctly for rethrows?
2848 // We may be discarding useful information
2849 // when this gets GC'ed
2850 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace_ips, mono_defaults.int_class));
2851 g_list_free (trace_ips);
2854 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2856 return &mono_ex->object;
2860 * mono_llvm_clear_exception:
2862 * Mark the currently thrown exception as handled.
2865 mono_llvm_clear_exception (void)
2867 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2868 mono_gchandle_free (jit_tls->thrown_exc);
2869 jit_tls->thrown_exc = 0;
2871 mono_memory_barrier ();
2875 * mono_llvm_match_exception:
2877 * Return the innermost clause containing REGION_START-REGION_END which can handle
2878 * the current exception.
2881 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end)
2883 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2887 g_assert (jit_tls->thrown_exc);
2888 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
2889 for (int i = 0; i < jinfo->num_clauses; i++) {
2890 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
2892 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
2895 // FIXME: Handle edge cases handled in get_exception_catch_class
2896 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (exc, ei->data.catch_class)) {
2897 index = ei->clause_index;
2899 } else if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2900 g_assert_not_reached ();
2909 mono_debug_personality (int a, _Unwind_Action b,
2910 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
2912 g_assert_not_reached ();
2916 mono_debug_personality (void)
2918 g_assert_not_reached ();