2 * mini-exceptions.c: generic exception support
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Novell, Inc.
10 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
21 #ifdef HAVE_EXECINFO_H
25 #ifdef HAVE_SYS_TYPES_H
26 #include <sys/types.h>
29 #ifdef HAVE_SYS_WAIT_H
37 #ifdef HAVE_SYS_SYSCALL_H
38 #include <sys/syscall.h>
41 #include <mono/metadata/appdomain.h>
42 #include <mono/metadata/tabledefs.h>
43 #include <mono/metadata/threads.h>
44 #include <mono/metadata/threads-types.h>
45 #include <mono/metadata/debug-helpers.h>
46 #include <mono/metadata/exception.h>
47 #include <mono/metadata/gc-internal.h>
48 #include <mono/metadata/mono-debug.h>
49 #include <mono/metadata/profiler.h>
50 #include <mono/metadata/mono-endian.h>
51 #include <mono/metadata/environment.h>
52 #include <mono/utils/mono-mmap.h>
53 #include <mono/utils/mono-logger-internal.h>
57 #include "debugger-agent.h"
58 #include "seq-points.h"
60 #ifdef ENABLE_EXTENSION_MODULE
61 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
64 #ifndef MONO_ARCH_CONTEXT_DEF
65 #define MONO_ARCH_CONTEXT_DEF
68 static gpointer restore_context_func, call_filter_func;
69 static gpointer throw_exception_func, rethrow_exception_func;
70 static gpointer throw_corlib_exception_func;
72 static gpointer try_more_restore_tramp = NULL;
73 static gpointer restore_stack_protection_tramp = NULL;
75 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
76 static gpointer unhandled_exception_hook_data = NULL;
78 static void try_more_restore (void);
79 static void restore_stack_protection (void);
80 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
81 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
82 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
85 mono_exceptions_init (void)
87 MonoRuntimeExceptionHandlingCallbacks cbs;
89 restore_context_func = mono_aot_get_trampoline ("restore_context");
90 call_filter_func = mono_aot_get_trampoline ("call_filter");
91 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
92 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
96 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
97 mono_tramp_info_register (info);
98 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
99 mono_tramp_info_register (info);
100 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
101 mono_tramp_info_register (info);
102 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
103 mono_tramp_info_register (info);
105 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
106 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
107 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
110 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
111 mono_arch_exceptions_init ();
113 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
114 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
115 cbs.mono_raise_exception = mono_get_throw_exception ();
116 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
117 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
118 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
119 mono_install_eh_callbacks (&cbs);
123 mono_get_throw_exception (void)
125 g_assert (throw_exception_func);
126 return throw_exception_func;
130 mono_get_rethrow_exception (void)
132 g_assert (rethrow_exception_func);
133 return rethrow_exception_func;
137 mono_get_call_filter (void)
139 g_assert (call_filter_func);
140 return call_filter_func;
144 mono_get_restore_context (void)
146 g_assert (restore_context_func);
147 return restore_context_func;
151 mono_get_throw_corlib_exception (void)
153 gpointer code = NULL;
156 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
157 if (throw_corlib_exception_func)
158 return throw_corlib_exception_func;
161 code = mono_aot_get_trampoline ("throw_corlib_exception");
163 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
164 mono_tramp_info_register (info);
167 mono_memory_barrier ();
169 throw_corlib_exception_func = code;
171 return throw_corlib_exception_func;
175 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
177 MonoTryBlockHoleTableJitInfo *table;
182 if (ei->try_start > ip || ip >= ei->try_end)
185 if (!ji->has_try_block_holes)
188 table = mono_jit_info_get_try_block_hole_table_info (ji);
189 offset = (guint32)((char*)ip - (char*)ji->code_start);
190 clause = (guint16)(ei - ji->clauses);
191 g_assert (clause < ji->num_clauses);
193 for (i = 0; i < table->num_holes; ++i) {
194 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
195 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
204 * Translate between the mono_arch_find_jit_info function and the old API.
207 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
208 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
210 StackFrameInfo frame;
213 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
215 /* Avoid costly table lookup during stack overflow */
216 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
219 ji = mini_jit_info_table_find (domain, ip, NULL);
224 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
228 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
230 * Remove any unused lmf.
231 * Mask out the lower bits which might be used to hold additional information.
233 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
236 /* Convert between the new and the old APIs */
237 switch (frame.type) {
238 case FRAME_TYPE_MANAGED:
242 case FRAME_TYPE_MANAGED_TO_NATIVE:
246 memset (res, 0, sizeof (MonoJitInfo));
247 res->d.method = frame.method;
250 case FRAME_TYPE_DEBUGGER_INVOKE: {
254 * The normal exception handling code can't handle this frame, so just
257 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
258 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
262 g_assert_not_reached ();
267 /* mono_find_jit_info:
269 * This function is used to gather information from @ctx. It return the
270 * MonoJitInfo of the corresponding function, unwinds one stack frame and
271 * stores the resulting context into @new_ctx. It also stores a string
272 * describing the stack location into @trace (if not NULL), and modifies
273 * the @lmf if necessary. @native_offset return the IP offset from the
274 * start of the function or -1 if that info is not available.
277 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
278 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
282 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
284 MonoMethod *method = NULL;
295 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
297 if (ji == (gpointer)-1)
301 method = jinfo_get_method (ji);
303 if (managed2 || (ji && method->wrapper_type)) {
304 const char *real_ip, *start;
307 start = (const char *)ji->code_start;
309 /* ctx->ip points into native code */
310 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
312 real_ip = (const char*)ip;
314 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
315 offset = real_ip - start;
320 *native_offset = offset;
323 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
327 *trace = mono_debug_print_stack_frame (method, offset, domain);
330 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
331 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
340 * mono_find_jit_info_ext:
342 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
344 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
345 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
346 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
347 * to obtain the last managed frame.
348 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
349 * On return, it will be filled with the locations where callee saved registers are saved
350 * by the current frame. This is returned outside of StackFrameInfo because it can be
351 * quite large on some platforms.
352 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
356 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
357 MonoJitInfo *prev_ji, MonoContext *ctx,
358 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
359 mgreg_t **save_locations,
360 StackFrameInfo *frame)
363 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
365 MonoDomain *target_domain = domain;
366 MonoMethod *method = NULL;
367 gboolean async = mono_thread_info_is_async_context ();
372 /* Avoid costly table lookup during stack overflow */
373 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
376 ji = mini_jit_info_table_find (domain, ip, &target_domain);
379 target_domain = domain;
382 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
384 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
388 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
390 * Remove any unused lmf.
391 * Mask out the lower bits which might be used to hold additional information.
393 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
396 if (frame->ji && !frame->ji->async)
397 method = jinfo_get_method (frame->ji);
399 if (frame->type == FRAME_TYPE_MANAGED && method) {
400 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
401 frame->managed = TRUE;
404 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
406 * This type of frame is just a marker, the caller should unwind once more to get the
407 * last managed frame.
410 frame->method = NULL;
413 frame->native_offset = -1;
414 frame->domain = target_domain;
415 frame->async_context = async;
419 if (frame->type == FRAME_TYPE_MANAGED)
420 frame->method = method;
422 if (ji && (frame->managed || (method && method->wrapper_type))) {
423 const char *real_ip, *start;
425 start = (const char *)ji->code_start;
427 /* ctx->ip points into native code */
428 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
430 real_ip = (const char*)ip;
432 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
433 frame->native_offset = real_ip - start;
435 frame->native_offset = -1;
438 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
440 if (trace && frame->method) {
441 char *fname = mono_method_full_name (frame->method, TRUE);
442 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
451 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
453 MonoGenericJitInfo *gi;
457 if (!ji->has_generic_jit_info)
459 gi = mono_jit_info_get_generic_jit_info (ji);
465 * Search location list if available, it contains the precise location of the
466 * argument for every pc offset, even if the method was interrupted while it was in
470 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
473 for (i = 0; i < gi->nlocs; ++i) {
474 MonoDwarfLocListEntry *entry = &gi->locations [i];
476 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
478 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
480 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
484 g_assert (i < gi->nlocs);
487 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
489 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
493 method = jinfo_get_method (ji);
494 if (mono_method_get_context (method)->method_inst) {
496 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
499 /* Avoid returning a managed object */
500 MonoObject *this_obj = info;
502 return this_obj->vtable->klass;
506 static MonoGenericContext
507 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
509 MonoGenericContext context = { NULL, NULL };
510 MonoClass *class, *method_container_class;
513 g_assert (generic_info);
515 method = jinfo_get_method (ji);
516 g_assert (method->is_inflated);
517 if (mono_method_get_context (method)->method_inst) {
518 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
520 class = mrgctx->class_vtable->klass;
521 context.method_inst = mrgctx->method_inst;
522 g_assert (context.method_inst);
523 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
524 MonoVTable *vtable = generic_info;
526 class = vtable->klass;
528 class = generic_info;
531 //g_assert (!method->klass->generic_container);
532 if (method->klass->generic_class)
533 method_container_class = method->klass->generic_class->container_class;
535 method_container_class = method->klass;
537 /* class might refer to a subclass of method's class */
538 while (!(class == method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
539 class = class->parent;
543 if (class->generic_class || class->generic_container)
544 context.class_inst = mini_class_get_context (class)->class_inst;
546 if (class->generic_class)
547 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
549 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
555 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
558 MonoGenericContext context;
561 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
562 return jinfo_get_method (ji);
563 context = get_generic_context_from_stack_frame (ji, generic_info);
565 method = jinfo_get_method (ji);
566 method = mono_method_get_declaring_generic_method (method);
567 method = mono_class_inflate_generic_method_checked (method, &context, &error);
568 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
574 * mono_exception_walk_native_trace:
575 * @ex: The exception object whose frames should be walked
576 * @func: callback to call for each stack frame
577 * @user_data: data passed to the callback
579 * This function walks the stacktrace of an exception. For
580 * each frame the callback function is called with the relevant info.
581 * The walk ends when no more stack frames are found or when the callback
582 * returns a TRUE value.
586 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
588 MonoDomain *domain = mono_domain_get ();
589 MonoArray *ta = ex->trace_ips;
595 len = mono_array_length (ta) >> 1;
596 for (i = 0; i < len; i++) {
597 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
598 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
599 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
602 if (func (NULL, ip, 0, FALSE, user_data))
605 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
606 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
615 ves_icall_System_Exception_get_trace (MonoException *ex)
617 MonoDomain *domain = mono_domain_get ();
619 MonoArray *ta = ex->trace_ips;
624 /* Exception is not thrown yet */
627 len = mono_array_length (ta) >> 1;
628 trace_str = g_string_new ("");
629 for (i = 0; i < len; i++) {
631 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
632 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
634 ji = mono_jit_info_table_find (domain, ip);
636 /* Unmanaged frame */
637 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
641 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
643 address = (char *)ip - (char *)ji->code_start;
644 location = mono_debug_print_stack_frame (
645 method, address, ex->object.vtable->domain);
647 g_string_append_printf (trace_str, "%s\n", location);
652 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
653 g_string_free (trace_str, TRUE);
659 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
661 MonoDomain *domain = mono_domain_get ();
663 MonoArray *ta = exc->trace_ips;
664 MonoDebugSourceLocation *location;
668 /* Exception is not thrown yet */
669 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
672 len = mono_array_length (ta) >> 1;
674 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
676 for (i = skip; i < len; i++) {
678 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
679 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
680 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
683 ji = mono_jit_info_table_find (domain, ip);
685 /* Unmanaged frame */
686 mono_array_setref (res, i, sf);
690 g_assert (ji != NULL);
692 method = get_method_from_stack_frame (ji, generic_info);
693 if (jinfo_get_method (ji)->wrapper_type) {
697 s = mono_method_full_name (method, TRUE);
698 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
702 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
703 sf->method_address = (gsize) ji->code_start;
704 sf->native_offset = (char *)ip - (char *)ji->code_start;
707 * mono_debug_lookup_source_location() returns both the file / line number information
708 * and the IL offset. Note that computing the IL offset is already an expensive
709 * operation, so we shouldn't call this method twice.
711 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
713 sf->il_offset = location->il_offset;
716 if (find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
717 sf->il_offset = sp.il_offset;
722 if (need_file_info) {
723 if (location && location->source_file) {
724 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
725 sf->line = location->row;
726 sf->column = location->column;
728 sf->line = sf->column = 0;
733 mono_debug_free_source_location (location);
734 mono_array_setref (res, i, sf);
741 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
744 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
745 if (jit_tls && jit_tls->orig_ex_ctx_set)
746 start_ctx = &jit_tls->orig_ex_ctx;
748 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
751 * mono_walk_stack_with_ctx:
753 * Unwind the current thread starting at @start_ctx.
755 * If @start_ctx is null, we capture the current context.
758 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
760 MonoContext extra_ctx;
761 MonoInternalThread *thread = mono_thread_internal_current ();
762 MONO_ARCH_CONTEXT_DEF
764 if (!thread || !thread->jit_data)
768 mono_arch_flush_register_windows ();
770 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
771 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
773 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
775 start_ctx = &extra_ctx;
778 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
782 * mono_walk_stack_with_state:
784 * Unwind a thread described by @state.
786 * State must be valid (state->valid == TRUE).
788 * If you are using this function to unwind another thread, make sure it is suspended.
790 * If @state is null, we capture the current context.
793 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
795 MonoThreadUnwindState extra_state;
797 g_assert (!mono_thread_info_is_async_context ());
798 if (!mono_thread_state_init_from_current (&extra_state))
800 state = &extra_state;
803 g_assert (state->valid);
805 mono_walk_stack_full (func,
807 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
808 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
809 state->unwind_data [MONO_UNWIND_DATA_LMF],
810 unwind_options, user_data);
814 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
816 MonoThreadUnwindState state;
817 if (!mono_thread_state_init_from_current (&state))
819 mono_walk_stack_with_state (func, &state, options, user_data);
823 * mono_walk_stack_full:
824 * @func: callback to call for each stack frame
825 * @domain: starting appdomain, can be NULL to use the current domain
826 * @unwind_options: what extra information the unwinder should gather
827 * @start_ctx: starting state of the stack walk, can be NULL.
828 * @thread: the thread whose stack to walk, can be NULL to use the current thread
829 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
830 * @user_data: data passed to the callback
832 * This function walks the stack of a thread, starting from the state
833 * represented by start_ctx. For each frame the callback
834 * function is called with the relevant info. The walk ends when no more
835 * managed stack frames are found or when the callback returns a TRUE value.
838 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
841 MonoContext ctx, new_ctx;
842 StackFrameInfo frame;
844 mgreg_t *reg_locations [MONO_MAX_IREGS];
845 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
846 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
847 gboolean async = mono_thread_info_is_async_context ();
849 g_assert (start_ctx);
852 /*The LMF will be null if the target have no managed frames.*/
853 /* g_assert (lmf); */
856 g_assert (unwind_options == MONO_UNWIND_NONE);
858 memcpy (&ctx, start_ctx, sizeof (MonoContext));
859 memset (reg_locations, 0, sizeof (reg_locations));
861 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
863 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
867 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
868 MonoDebugSourceLocation *source;
870 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
872 il_offset = source->il_offset;
875 if (find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
876 il_offset = sp.il_offset;
880 mono_debug_free_source_location (source);
884 frame.il_offset = il_offset;
886 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
887 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
889 frame.actual_method = frame.method;
892 if (get_reg_locations)
893 frame.reg_locations = reg_locations;
895 if (func (&frame, &ctx, user_data))
898 if (get_reg_locations) {
899 for (i = 0; i < MONO_MAX_IREGS; ++i)
900 if (new_reg_locations [i])
901 reg_locations [i] = new_reg_locations [i];
909 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
910 MonoReflectionMethod **method,
911 gint32 *iloffset, gint32 *native_offset,
912 MonoString **file, gint32 *line, gint32 *column)
914 MonoDomain *domain = mono_domain_get ();
915 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
916 MonoLMF *lmf = mono_get_lmf ();
917 MonoJitInfo *ji = NULL;
918 MonoContext ctx, new_ctx;
919 MonoDebugSourceLocation *location;
920 MonoMethod *jmethod = NULL, *actual_method;
921 StackFrameInfo frame;
924 MONO_ARCH_CONTEXT_DEF;
926 mono_arch_flush_register_windows ();
928 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
929 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
931 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
937 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
941 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
945 *native_offset = frame.native_offset;
947 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
948 jmethod = jinfo_get_method (ji);
949 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
954 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
956 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
958 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
960 *iloffset = location->il_offset;
964 if (need_file_info) {
966 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
967 *line = location->row;
968 *column = location->column;
975 mono_debug_free_source_location (location);
982 MonoSecurityFrame *frame;
983 } MonoFrameSecurityInfo;
986 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
988 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
989 MonoJitInfo *ji = frame->ji;
995 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
996 method = jinfo_get_method (ji);
997 if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
998 method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
999 method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
1000 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
1001 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
1005 if (si->skips > 0) {
1010 si->frame = mono_declsec_create_frame (frame->domain, ji);
1012 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
1017 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
1018 * @skip: the number of stack frames to skip
1020 * This function returns a the security informations of a single stack frame
1021 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
1022 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
1026 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
1028 MonoFrameSecurityInfo si;
1033 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
1035 return (si.skips == 0) ? si.frame : NULL;
1044 } MonoSecurityStack;
1047 grow_array (MonoSecurityStack *stack)
1049 MonoDomain *domain = mono_domain_get ();
1050 guint32 newsize = (stack->maximum << 1);
1051 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
1053 for (i=0; i < stack->maximum; i++) {
1054 gpointer frame = mono_array_get (stack->stack, gpointer, i);
1055 mono_array_setref (newstack, i, frame);
1057 stack->maximum = newsize;
1058 stack->stack = newstack;
1062 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
1064 MonoSecurityStack *ss = (MonoSecurityStack*) data;
1065 MonoJitInfo *ji = frame->ji;
1071 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
1072 method = jinfo_get_method (ji);
1073 if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
1074 method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
1075 method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
1076 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
1077 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
1081 if (ss->skips > 0) {
1086 if (ss->count == ss->maximum)
1089 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
1091 /* continue down the stack */
1096 glist_to_array (GList *list, MonoClass *eclass)
1098 MonoDomain *domain = mono_domain_get ();
1105 len = g_list_length (list);
1106 res = mono_array_new (domain, eclass, len);
1108 for (i = 0; list; list = list->next, i++)
1109 mono_array_set (res, gpointer, i, list->data);
1115 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1116 * @skip: the number of stack frames to skip
1118 * This function returns an managed array of containing the security
1119 * informations for each frame (after the skipped ones). This is used for
1120 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1124 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1126 MonoSecurityStack ss;
1128 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1134 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1135 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1136 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1137 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1142 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1144 MonoClass *catch_class = ei->data.catch_class;
1145 MonoType *inflated_type;
1146 MonoGenericContext context;
1148 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1149 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1152 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1154 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1156 /* FIXME: we shouldn't inflate but instead put the
1157 type in the rgctx and fetch it from there. It
1158 might be a good idea to do this lazily, i.e. only
1159 when the exception is actually thrown, so as not to
1160 waste space for exception clauses which might never
1162 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1163 catch_class = mono_class_from_mono_type (inflated_type);
1164 mono_metadata_free_type (inflated_type);
1170 * mini_jit_info_table_find:
1172 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1173 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1174 * OUT_DOMAIN if it is not NULL.
1177 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1180 MonoInternalThread *t = mono_thread_internal_current ();
1186 ji = mono_jit_info_table_find (domain, addr);
1189 *out_domain = domain;
1193 /* maybe it is shared code, so we also search in the root domain */
1194 if (domain != mono_get_root_domain ()) {
1195 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1198 *out_domain = mono_get_root_domain ();
1206 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1207 for (; refs && *refs; refs++) {
1208 if (*refs != domain && *refs != mono_get_root_domain ()) {
1209 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1212 *out_domain = (MonoDomain*) *refs;
1222 * wrap_non_exception_throws:
1224 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1225 * WrapNonExceptionThrows flag set.
1228 wrap_non_exception_throws (MonoMethod *m)
1230 MonoAssembly *ass = m->klass->image->assembly;
1231 MonoCustomAttrInfo* attrs;
1232 static MonoClass *klass;
1234 gboolean val = FALSE;
1237 if (ass->wrap_non_exception_throws_inited)
1238 return ass->wrap_non_exception_throws;
1240 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1242 attrs = mono_custom_attrs_from_assembly (ass);
1244 for (i = 0; i < attrs->num_attrs; ++i) {
1245 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1247 int len, num_named, named_type, data_type, name_len;
1250 if (!attr->ctor || attr->ctor->klass != klass)
1252 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1253 len = attr->data_size;
1254 p = (const char*)attr->data;
1255 g_assert (read16 (p) == 0x0001);
1257 num_named = read16 (p);
1266 if (named_type != 0x54)
1268 name_len = mono_metadata_decode_blob_size (p, &p);
1269 name = g_malloc (name_len + 1);
1270 memcpy (name, p, name_len);
1271 name [name_len] = 0;
1273 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1275 /* The value is a BOOLEAN */
1278 mono_custom_attrs_free (attrs);
1281 ass->wrap_non_exception_throws = val;
1282 mono_memory_barrier ();
1283 ass->wrap_non_exception_throws_inited = TRUE;
1288 #ifndef MONO_ARCH_STACK_GROWS_UP
1289 #define DOES_STACK_GROWS_UP 1
1291 #define DOES_STACK_GROWS_UP 0
1294 #define MAX_UNMANAGED_BACKTRACE 128
1296 build_native_trace (void)
1298 /* This puppy only makes sense on mobile, IOW, ARM. */
1299 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1301 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1302 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1307 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1309 for (i = 0; i < size; i++)
1310 mono_array_set (res, gpointer, i, native_trace [i]);
1317 #define setup_managed_stacktrace_information() do { \
1318 if (mono_ex && !initial_trace_ips) { \
1319 trace_ips = g_list_reverse (trace_ips); \
1320 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1321 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1322 if (has_dynamic_methods) \
1323 /* These methods could go away anytime, so compute the stack trace now */ \
1324 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1326 g_list_free (trace_ips); \
1330 * mono_handle_exception_internal_first_pass:
1332 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1333 * OBJ is found. Run the index of the filter clause which caught the exception into
1334 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1337 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1339 MonoDomain *domain = mono_domain_get ();
1340 MonoJitInfo *ji = NULL;
1341 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1342 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1343 MonoLMF *lmf = mono_get_lmf ();
1344 MonoArray *initial_trace_ips = NULL;
1345 GList *trace_ips = NULL;
1346 MonoException *mono_ex;
1347 gboolean stack_overflow = FALSE;
1348 MonoContext initial_ctx;
1350 int frame_count = 0;
1351 gboolean has_dynamic_methods = FALSE;
1356 g_assert (ctx != NULL);
1358 if (obj == domain->stack_overflow_ex)
1359 stack_overflow = TRUE;
1361 mono_ex = (MonoException*)obj;
1362 initial_trace_ips = mono_ex->trace_ips;
1364 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1365 mono_ex = (MonoException*)obj;
1366 initial_trace_ips = mono_ex->trace_ips;
1372 call_filter = mono_get_call_filter ();
1374 g_assert (jit_tls->end_of_stack);
1375 g_assert (jit_tls->abort_func);
1378 *out_filter_idx = -1;
1382 *out_prev_ji = NULL;
1387 MonoContext new_ctx;
1389 int clause_index_start = 0;
1390 gboolean unwind_res = TRUE;
1392 StackFrameInfo frame;
1397 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1399 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1403 g_assert (frame.type == FRAME_TYPE_MANAGED);
1408 setup_managed_stacktrace_information ();
1413 method = jinfo_get_method (ji);
1414 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1416 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1417 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1418 "The native frame called the managed method:\n%s\n",
1419 mono_method_full_name (method, TRUE));
1422 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1424 * Avoid overwriting the stack trace if the exception is
1425 * rethrown. Also avoid giant stack traces during a stack
1428 if (!initial_trace_ips && (frame_count < 1000)) {
1429 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1430 trace_ips = g_list_prepend (trace_ips,
1431 get_generic_info_from_stack_frame (ji, ctx));
1435 if (method->dynamic)
1436 has_dynamic_methods = TRUE;
1438 if (stack_overflow) {
1439 if (DOES_STACK_GROWS_UP)
1440 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1442 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1444 free_stack = 0xffffff;
1447 for (i = clause_index_start; i < ji->num_clauses; i++) {
1448 MonoJitExceptionInfo *ei = &ji->clauses [i];
1449 gboolean filtered = FALSE;
1452 * During stack overflow, wait till the unwinding frees some stack
1453 * space before running handlers/finalizers.
1455 if (free_stack <= (64 * 1024))
1458 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1460 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1463 * Have to unwrap RuntimeWrappedExceptions if the
1464 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1466 if (non_exception && !wrap_non_exception_throws (method))
1467 ex_obj = non_exception;
1471 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1472 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1473 #ifndef DISABLE_PERFCOUNTERS
1474 mono_perfcounters->exceptions_filters++;
1477 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1478 trim the stackframe since if it returns FALSE we lose information.
1480 FIXME Not 100% sure if it's a good idea even with user clauses.
1483 setup_managed_stacktrace_information ();
1485 if (ji->from_llvm) {
1486 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1487 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1489 g_assert_not_reached ();
1492 /* store the exception object in bp + ei->exvar_offset */
1493 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1496 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1497 filtered = call_filter (ctx, ei->data.filter);
1498 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1499 if (filtered && out_filter_idx)
1500 *out_filter_idx = filter_idx;
1507 setup_managed_stacktrace_information ();
1508 /* mono_debugger_agent_handle_exception () needs this */
1509 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1514 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1515 setup_managed_stacktrace_information ();
1520 /* mono_debugger_agent_handle_exception () needs this */
1521 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1530 g_assert_not_reached ();
1534 * mono_handle_exception_internal:
1535 * @ctx: saved processor state
1536 * @obj: the exception object
1537 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1540 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1542 MonoDomain *domain = mono_domain_get ();
1543 MonoJitInfo *ji, *prev_ji;
1544 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1545 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1546 MonoLMF *lmf = mono_get_lmf ();
1547 MonoException *mono_ex;
1548 gboolean stack_overflow = FALSE;
1549 MonoContext initial_ctx;
1551 int frame_count = 0;
1552 gint32 filter_idx, first_filter_idx = 0;
1555 MonoObject *non_exception = NULL;
1557 g_assert (ctx != NULL);
1559 MonoException *ex = mono_get_exception_null_reference ();
1560 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1561 obj = (MonoObject *)ex;
1565 * Allocate a new exception object instead of the preconstructed ones.
1567 if (obj == domain->stack_overflow_ex) {
1569 * It is not a good idea to try and put even more pressure on the little stack available.
1570 * obj = mono_get_exception_stack_overflow ();
1572 stack_overflow = TRUE;
1574 else if (obj == domain->null_reference_ex) {
1575 obj = mono_get_exception_null_reference ();
1578 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1579 non_exception = obj;
1580 obj = mono_get_exception_runtime_wrapped (obj);
1583 mono_ex = (MonoException*)obj;
1585 if (mini_get_debug_options ()->suspend_on_exception) {
1586 mono_runtime_printf_err ("Exception thrown, suspending...");
1591 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1592 mono_ex = (MonoException*)obj;
1597 if (mono_ex && jit_tls->class_cast_from) {
1598 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1599 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1600 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1601 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1602 mono_ex->message = mono_string_new (domain, msg);
1607 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1608 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1609 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1610 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1611 mono_ex->message = mono_string_new (domain, msg);
1619 call_filter = mono_get_call_filter ();
1621 g_assert (jit_tls->end_of_stack);
1622 g_assert (jit_tls->abort_func);
1625 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1626 * end up being TRUE on any code path.
1628 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1633 MonoContext ctx_cp = *ctx;
1634 if (mono_trace_is_enabled ()) {
1635 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1636 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1637 MonoObject *message;
1638 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1640 MonoObject *exc = NULL;
1641 if (get_message == NULL) {
1643 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1645 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1647 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1651 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1653 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1655 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1656 mono_print_thread_dump_from_ctx (ctx);
1658 jit_tls->orig_ex_ctx_set = TRUE;
1659 mono_profiler_exception_thrown (obj);
1660 jit_tls->orig_ex_ctx_set = FALSE;
1662 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1665 if (mini_get_debug_options ()->break_on_exc)
1667 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1669 if (mini_get_debug_options ()->suspend_on_unhandled) {
1670 mono_runtime_printf_err ("Unhandled exception, suspending...");
1675 // FIXME: This runs managed code so it might cause another stack overflow when
1676 // we are handling a stack overflow
1677 mono_unhandled_exception (obj);
1679 gboolean unhandled = FALSE;
1682 * The exceptions caught by the mono_runtime_invoke () calls in mono_async_invoke () needs to be treated as
1683 * unhandled (#669836).
1684 * FIXME: The check below is hackish, but its hard to distinguish these runtime invoke calls from others
1687 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1689 MonoInternalThread *thread = mono_thread_internal_current ();
1690 if (jinfo_get_method (prev_ji) == thread->async_invoke_method)
1695 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1697 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1707 MonoContext new_ctx;
1709 int clause_index_start = 0;
1710 gboolean unwind_res = TRUE;
1714 ji = jit_tls->resume_state.ji;
1715 new_ctx = jit_tls->resume_state.new_ctx;
1716 clause_index_start = jit_tls->resume_state.clause_index;
1717 lmf = jit_tls->resume_state.lmf;
1718 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1719 filter_idx = jit_tls->resume_state.filter_idx;
1721 StackFrameInfo frame;
1723 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1725 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1729 g_assert (frame.type == FRAME_TYPE_MANAGED);
1735 *(mono_get_lmf_addr ()) = lmf;
1737 jit_tls->abort_func (obj);
1738 g_assert_not_reached ();
1741 method = jinfo_get_method (ji);
1743 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1745 if (stack_overflow) {
1746 if (DOES_STACK_GROWS_UP)
1747 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1749 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1751 free_stack = 0xffffff;
1754 for (i = clause_index_start; i < ji->num_clauses; i++) {
1755 MonoJitExceptionInfo *ei = &ji->clauses [i];
1756 gboolean filtered = FALSE;
1759 * During stack overflow, wait till the unwinding frees some stack
1760 * space before running handlers/finalizers.
1762 if (free_stack <= (64 * 1024))
1765 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1767 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1770 * Have to unwrap RuntimeWrappedExceptions if the
1771 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1773 if (non_exception && !wrap_non_exception_throws (method))
1774 ex_obj = non_exception;
1778 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1779 if (ji->from_llvm) {
1780 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1781 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1783 g_assert_not_reached ();
1786 /* store the exception object in bp + ei->exvar_offset */
1787 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1791 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1793 * Filter clauses should only be run in the
1794 * first pass of exception handling.
1796 filtered = (filter_idx == first_filter_idx);
1800 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1801 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1803 * This guards against the situation that we abort a thread that is executing a finally clause
1804 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1805 * check for this situation here and resume interruption if we are below the guarded block.
1807 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1808 gboolean is_outside = FALSE;
1809 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1810 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1811 //FIXME make this stack direction aware
1812 if (catch_bp > prot_bp) {
1814 } else if (catch_bp == prot_bp) {
1815 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1816 * So we check if the catch handler_start is protected by the guarded handler protected region
1819 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1820 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1821 * There aren't any further finally/fault handler blocks down the stack over this exception.
1822 * This must be ensured by the code that installs the guard trampoline.
1824 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1826 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1831 jit_tls->handler_block_return_address = NULL;
1832 jit_tls->handler_block = NULL;
1833 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1837 if (mono_trace_is_enabled () && mono_trace_eval (method))
1838 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1839 jit_tls->orig_ex_ctx_set = TRUE;
1840 mono_profiler_exception_clause_handler (method, ei->flags, i);
1841 jit_tls->orig_ex_ctx_set = FALSE;
1842 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1844 #ifndef DISABLE_PERFCOUNTERS
1845 mono_perfcounters->exceptions_depth += frame_count;
1847 if (obj == domain->stack_overflow_ex)
1848 jit_tls->handling_stack_ovf = FALSE;
1852 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1853 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1854 if (mono_trace_is_enabled () && mono_trace_eval (method))
1855 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1856 jit_tls->orig_ex_ctx_set = TRUE;
1857 mono_profiler_exception_clause_handler (method, ei->flags, i);
1858 jit_tls->orig_ex_ctx_set = FALSE;
1859 call_filter (ctx, ei->handler_start);
1861 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1862 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1863 if (mono_trace_is_enabled () && mono_trace_eval (method))
1864 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1865 jit_tls->orig_ex_ctx_set = TRUE;
1866 mono_profiler_exception_clause_handler (method, ei->flags, i);
1867 jit_tls->orig_ex_ctx_set = FALSE;
1868 #ifndef DISABLE_PERFCOUNTERS
1869 mono_perfcounters->exceptions_finallys++;
1872 if (ji->from_llvm) {
1874 * LLVM compiled finally handlers follow the design
1875 * of the c++ ehabi, i.e. they call a resume function
1876 * at the end instead of returning to the caller.
1877 * So save the exception handling state,
1878 * mono_resume_unwind () will call us again to continue
1881 jit_tls->resume_state.ex_obj = obj;
1882 jit_tls->resume_state.ji = ji;
1883 jit_tls->resume_state.clause_index = i + 1;
1884 jit_tls->resume_state.ctx = *ctx;
1885 jit_tls->resume_state.new_ctx = new_ctx;
1886 jit_tls->resume_state.lmf = lmf;
1887 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1888 jit_tls->resume_state.filter_idx = filter_idx;
1889 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1892 call_filter (ctx, ei->handler_start);
1898 jit_tls->orig_ex_ctx_set = TRUE;
1899 mono_profiler_exception_method_leave (method);
1900 jit_tls->orig_ex_ctx_set = FALSE;
1905 g_assert_not_reached ();
1909 * mono_debugger_run_finally:
1910 * @start_ctx: saved processor state
1912 * This method is called by the Mono Debugger to call all `finally' clauses of the
1913 * current stack frame. It's used when the user issues a `return' command to make
1914 * the current stack frame return. After returning from this method, the debugger
1915 * unwinds the stack one frame and gives control back to the user.
1917 * NOTE: This method is only used when running inside the Mono Debugger.
1920 mono_debugger_run_finally (MonoContext *start_ctx)
1922 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1923 MonoDomain *domain = mono_domain_get ();
1924 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1925 MonoLMF *lmf = mono_get_lmf ();
1926 MonoContext ctx, new_ctx;
1927 MonoJitInfo *ji, rji;
1932 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1933 if (!ji || ji == (gpointer)-1)
1937 call_filter = mono_get_call_filter ();
1939 for (i = 0; i < ji->num_clauses; i++) {
1940 MonoJitExceptionInfo *ei = &ji->clauses [i];
1942 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1943 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1944 call_filter (&ctx, ei->handler_start);
1950 * mono_handle_exception:
1951 * @ctx: saved processor state
1952 * @obj: the exception object
1955 mono_handle_exception (MonoContext *ctx, gpointer obj)
1957 #ifndef DISABLE_PERFCOUNTERS
1958 mono_perfcounters->exceptions_thrown++;
1961 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1964 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1966 #ifndef MONO_ARCH_USE_SIGACTION
1967 #error "Can't use sigaltstack without sigaction"
1970 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1973 mono_setup_altstack (MonoJitTlsData *tls)
1977 guint8 *staddr = NULL;
1979 if (mono_running_on_valgrind ())
1982 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1986 tls->end_of_stack = staddr + stsize;
1987 tls->stack_size = stsize;
1989 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1991 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1992 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1994 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1996 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1997 /* mprotect can fail for the main thread stack */
1998 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);
1999 g_assert (gaddr == tls->stack_ovf_guard_base);
2000 tls->stack_ovf_valloced = TRUE;
2003 /* Setup an alternate signal stack */
2004 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
2005 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2007 g_assert (tls->signal_stack);
2009 sa.ss_sp = tls->signal_stack;
2010 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2012 g_assert (sigaltstack (&sa, NULL) == 0);
2014 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);
2018 mono_free_altstack (MonoJitTlsData *tls)
2023 sa.ss_sp = tls->signal_stack;
2024 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2025 sa.ss_flags = SS_DISABLE;
2026 err = sigaltstack (&sa, NULL);
2027 g_assert (err == 0);
2029 if (tls->signal_stack)
2030 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
2031 if (tls->stack_ovf_valloced)
2032 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
2034 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2037 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2040 mono_setup_altstack (MonoJitTlsData *tls)
2045 mono_free_altstack (MonoJitTlsData *tls)
2049 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2052 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2054 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2055 /* we need to leave some room for throwing the exception */
2056 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2057 unprotect_size -= mono_pagesize ();
2058 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2059 * is sufficient stack
2061 //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);
2063 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2064 return unprotect_size == jit_tls->stack_ovf_guard_size;
2067 static G_GNUC_UNUSED void
2068 try_more_restore (void)
2070 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2071 if (try_restore_stack_protection (jit_tls, 500))
2072 jit_tls->restore_stack_prot = NULL;
2075 static G_GNUC_UNUSED void
2076 restore_stack_protection (void)
2078 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2079 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2080 /* if we can't restore the stack protection, keep a callback installed so
2081 * we'll try to restore as much stack as we can at each return from unmanaged
2084 if (try_restore_stack_protection (jit_tls, 4096))
2085 jit_tls->restore_stack_prot = NULL;
2087 jit_tls->restore_stack_prot = try_more_restore_tramp;
2088 /* here we also throw a stack overflow exception */
2089 ex->trace_ips = NULL;
2090 ex->stack_trace = NULL;
2091 mono_raise_exception (ex);
2095 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2097 void (*func)(void) = (gpointer)tramp_data;
2103 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2105 /* we got a stack overflow in the soft-guard pages
2106 * There are two cases:
2107 * 1) managed code caused the overflow: we unprotect the soft-guard page
2108 * and let the arch-specific code trigger the exception handling mechanism
2109 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2110 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2111 * and hope we can continue with those enabled, at least until the hard-guard page
2112 * is hit. The alternative to continuing here is to just print a message and abort.
2113 * We may add in the future the code to protect the pages again in the codepath
2114 * when we return from unmanaged to managed code.
2116 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2117 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2118 /* we unprotect the minimum amount we can */
2120 gboolean handled = FALSE;
2122 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2123 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2124 guard_size -= mono_pagesize ();
2126 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2127 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2128 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);
2129 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2131 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2136 /* We print a message: after this even managed stack overflows
2137 * may crash the runtime
2139 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2140 if (!jit_tls->handling_stack_ovf) {
2141 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2142 jit_tls->handling_stack_ovf = 1;
2144 /*fprintf (stderr, "Already handling stack overflow\n");*/
2153 MonoMethod *omethod;
2155 } PrintOverflowUserData;
2157 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2159 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2161 MonoMethod *method = NULL;
2162 PrintOverflowUserData *user_data = data;
2166 method = jinfo_get_method (frame->ji);
2169 if (user_data->count == 0) {
2170 /* The first frame is in its prolog, so a line number cannot be computed */
2171 user_data->count ++;
2175 /* If this is a one method overflow, skip the other instances */
2176 if (method == user_data->omethod)
2179 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2180 mono_runtime_printf_err (" %s", location);
2183 if (user_data->count == 1) {
2184 mono_runtime_printf_err (" <...>");
2185 user_data->omethod = method;
2187 user_data->omethod = NULL;
2190 user_data->count ++;
2192 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2199 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2201 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2202 PrintOverflowUserData ud;
2206 /* we don't do much now, but we can warn the user with a useful message */
2207 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2209 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2210 mono_sigctx_to_monoctx (ctx, &mctx);
2212 mono_runtime_printf_err ("Stacktrace:");
2214 memset (&ud, 0, sizeof (ud));
2216 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2218 if (ji && jinfo_get_method (ji))
2219 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2221 mono_runtime_printf_err ("At <unmanaged>.");
2228 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2230 MonoMethod *method = NULL;
2233 method = jinfo_get_method (frame->ji);
2236 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2237 mono_runtime_printf_err (" %s", location);
2240 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2245 static G_GNUC_UNUSED gboolean
2246 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2248 GString *p = (GString*)data;
2249 MonoMethod *method = NULL;
2252 method = jinfo_get_method (frame->ji);
2254 if (method && frame->domain) {
2255 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2256 g_string_append_printf (p, " %s\n", location);
2259 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2264 #ifndef MONO_CROSS_COMPILE
2266 static gboolean handling_sigsegv = FALSE;
2269 * mono_handle_native_sigsegv:
2271 * Handle a SIGSEGV received while in native code by printing diagnostic
2272 * information and aborting.
2275 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2277 #ifdef MONO_ARCH_USE_SIGACTION
2278 struct sigaction sa;
2280 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2281 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2283 if (handling_sigsegv)
2286 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2287 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2298 /* To prevent infinite loops when the stack walk causes a crash */
2299 handling_sigsegv = TRUE;
2301 /* !jit_tls means the thread was not registered with the runtime */
2302 if (jit_tls && mono_thread_internal_current ()) {
2303 mono_runtime_printf_err ("Stacktrace:\n");
2305 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2308 #ifdef HAVE_BACKTRACE_SYMBOLS
2314 mono_runtime_printf_err ("\nNative stacktrace:\n");
2316 size = backtrace (array, 256);
2317 names = backtrace_symbols (array, size);
2318 for (i =0; i < size; ++i) {
2319 mono_runtime_printf_err ("\t%s", names [i]);
2323 /* Try to get more meaningful information using gdb */
2325 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2326 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2327 /* From g_spawn_command_line_sync () in eglib */
2330 pid_t crashed_pid = getpid ();
2334 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2335 * it will deadlock. Call the syscall directly instead.
2337 pid = mono_runtime_syscall_fork ();
2340 dup2 (STDERR_FILENO, STDOUT_FILENO);
2342 mono_gdb_render_native_backtraces (crashed_pid);
2346 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2347 waitpid (pid, &status, 0);
2351 #elif defined (ENABLE_EXTENSION_MODULE)
2352 mono_extension_handle_native_sigsegv (ctx, info);
2356 * A SIGSEGV indicates something went very wrong so we can no longer depend
2357 * on anything working. So try to print out lots of diagnostics, starting
2358 * with ones which have a greater chance of working.
2360 mono_runtime_printf_err (
2362 "=================================================================\n"
2363 "Got a %s while executing native code. This usually indicates\n"
2364 "a fatal error in the mono runtime or one of the native libraries \n"
2365 "used by your application.\n"
2366 "=================================================================\n",
2370 #ifdef MONO_ARCH_USE_SIGACTION
2372 /* Remove our SIGABRT handler */
2373 sa.sa_handler = SIG_DFL;
2374 sigemptyset (&sa.sa_mask);
2377 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2381 if (!mono_do_crash_chaining) {
2382 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2383 #if defined (PLATFORM_ANDROID)
2394 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2396 g_assert_not_reached ();
2399 #endif /* !MONO_CROSS_COMPILE */
2402 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2404 MonoInternalThread *thread = mono_thread_internal_current ();
2405 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2413 GError *error = NULL;
2418 text = g_string_new (0);
2420 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2422 g_string_append_printf (text, "\n\"%s\"", name);
2425 else if (thread->threadpool_thread)
2426 g_string_append (text, "\n\"<threadpool thread>\"");
2428 g_string_append (text, "\n\"<unnamed thread>\"");
2431 wapi_desc = wapi_current_thread_desc ();
2432 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2436 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2438 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2440 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2442 mono_sigctx_to_monoctx (sigctx, &ctx);
2444 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2446 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2449 mono_runtime_printf ("%s", text->str);
2451 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2452 OutputDebugStringA(text->str);
2455 g_string_free (text, TRUE);
2456 mono_runtime_stdout_fflush ();
2460 * mono_print_thread_dump:
2462 * Print information about the current thread to stdout.
2463 * SIGCTX can be NULL, allowing this to be called from gdb.
2466 mono_print_thread_dump (void *sigctx)
2468 mono_print_thread_dump_internal (sigctx, NULL);
2472 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2474 mono_print_thread_dump_internal (NULL, ctx);
2478 * mono_resume_unwind:
2480 * This is called by a trampoline from LLVM compiled finally clauses to continue
2484 mono_resume_unwind (MonoContext *ctx)
2486 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2487 MonoContext new_ctx;
2489 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2490 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2493 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2495 mono_restore_context (&new_ctx);
2498 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2503 MonoJitExceptionInfo *ei;
2504 } FindHandlerBlockData;
2507 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2511 FindHandlerBlockData *pdata = data;
2512 MonoJitInfo *ji = frame->ji;
2517 ip = MONO_CONTEXT_GET_IP (ctx);
2519 for (i = 0; i < ji->num_clauses; ++i) {
2520 MonoJitExceptionInfo *ei = ji->clauses + i;
2521 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2523 /*If ip points to the first instruction it means the handler block didn't start
2524 so we can leave its execution to the EH machinery*/
2525 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2537 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2540 MonoJitExceptionInfo *clause = NULL;
2543 ip = MONO_CONTEXT_GET_IP (ctx);
2545 for (i = 0; i < ji->num_clauses; ++i) {
2546 clause = &ji->clauses [i];
2547 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2549 if (clause->handler_start < ip && clause->data.handler_end > ip)
2553 /*no matching finally */
2554 if (i == ji->num_clauses)
2557 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2558 if (ip == clause->handler_start)
2561 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2565 * Finds the bottom handler block running and install a block guard if needed.
2566 * FIXME add full-aot support.
2569 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2571 FindHandlerBlockData data = { 0 };
2572 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2579 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2580 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2582 if (!jit_tls || jit_tls->handler_block_return_address)
2585 /* Do an async safe stack walk */
2586 mono_thread_info_set_is_async_context (TRUE);
2587 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2588 mono_thread_info_set_is_async_context (FALSE);
2593 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2595 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2596 if (resume_ip == NULL)
2599 jit_tls->handler_block_return_address = resume_ip;
2600 jit_tls->handler_block = data.ei;
2607 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2615 mono_set_cast_details (MonoClass *from, MonoClass *to)
2617 MonoJitTlsData *jit_tls = NULL;
2619 if (mini_get_debug_options ()->better_cast_details) {
2620 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2621 jit_tls->class_cast_from = from;
2622 jit_tls->class_cast_to = to;
2627 /*returns false if the thread is not attached*/
2629 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2631 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2632 MonoInternalThread *thread = mono_thread_internal_current ();
2633 if (!thread || !thread->jit_data) {
2639 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2641 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2642 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2644 g_error ("Use a null sigctx requires a working mono-context");
2647 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2648 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2649 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2653 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2659 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2661 MonoInternalThread *thread = mono_thread_internal_current ();
2662 if (!thread || !thread->jit_data) {
2668 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2669 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2670 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2675 /*returns false if the thread is not attached*/
2677 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2679 MonoInternalThread *thread = mono_thread_internal_current ();
2680 MONO_ARCH_CONTEXT_DEF
2682 mono_arch_flush_register_windows ();
2684 if (!thread || !thread->jit_data) {
2688 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2689 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2691 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2694 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2695 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2696 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2702 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2704 mono_handle_exception (ctx, exc);
2705 mono_restore_context (ctx);
2708 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2710 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2712 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2713 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2714 jit_tls->ex_ctx = *ctx;
2716 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2718 g_error ("This target doesn't support mono_arch_setup_async_callback");
2723 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2725 unhandled_exception_hook = func;
2726 unhandled_exception_hook_data = user_data;
2730 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2732 if (unhandled_exception_hook) {
2733 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2735 MonoObject *other = NULL;
2736 MonoString *str = mono_object_to_string (exc, &other);
2740 msg = mono_string_to_utf8 (str);
2742 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2743 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2745 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2746 original_backtrace, nested_backtrace);
2748 g_free (original_backtrace);
2749 g_free (nested_backtrace);
2751 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2753 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2755 #if defined(__APPLE__) && defined(__arm__)
2756 g_assertion_message ("Terminating runtime due to unhandled exception");
2758 exit (mono_environment_exitcode_get ());
2762 g_assert_not_reached ();
2766 * mono_restore_context:
2768 * Call the architecture specific restore context function.
2771 mono_restore_context (MonoContext *ctx)
2773 static void (*restore_context) (MonoContext *);
2775 if (!restore_context)
2776 restore_context = mono_get_restore_context ();
2777 restore_context (ctx);
2778 g_assert_not_reached ();
2782 * mono_jinfo_get_unwind_info:
2784 * Return the unwind info for JI.
2787 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2790 return mono_aot_get_unwind_info (ji, unwind_info_len);
2792 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2796 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2798 MonoArchEHJitInfo *info;
2800 info = mono_jit_info_get_arch_eh_info (ji);
2803 return info->epilog_size;