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).
11 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
22 #ifdef HAVE_EXECINFO_H
26 #ifdef HAVE_SYS_TYPES_H
27 #include <sys/types.h>
30 #ifdef HAVE_SYS_WAIT_H
38 #ifdef HAVE_SYS_SYSCALL_H
39 #include <sys/syscall.h>
42 #ifdef HAVE_SYS_PRCTL_H
43 #include <sys/prctl.h>
50 #include <mono/metadata/appdomain.h>
51 #include <mono/metadata/tabledefs.h>
52 #include <mono/metadata/threads.h>
53 #include <mono/metadata/threads-types.h>
54 #include <mono/metadata/debug-helpers.h>
55 #include <mono/metadata/exception.h>
56 #include <mono/metadata/exception-internals.h>
57 #include <mono/metadata/object-internals.h>
58 #include <mono/metadata/reflection-internals.h>
59 #include <mono/metadata/gc-internals.h>
60 #include <mono/metadata/mono-debug.h>
61 #include <mono/metadata/profiler.h>
62 #include <mono/metadata/mono-endian.h>
63 #include <mono/metadata/environment.h>
64 #include <mono/metadata/mono-mlist.h>
65 #include <mono/utils/mono-mmap.h>
66 #include <mono/utils/mono-logger-internals.h>
67 #include <mono/utils/mono-error.h>
68 #include <mono/utils/mono-error-internals.h>
72 #include "debugger-agent.h"
73 #include "seq-points.h"
74 #include "llvm-runtime.h"
75 #include "mini-llvm.h"
78 #include "mini-llvm-cpp.h"
81 #ifndef MONO_ARCH_CONTEXT_DEF
82 #define MONO_ARCH_CONTEXT_DEF
85 static gpointer restore_context_func, call_filter_func;
86 static gpointer throw_exception_func, rethrow_exception_func;
87 static gpointer throw_corlib_exception_func;
89 static gpointer try_more_restore_tramp = NULL;
90 static gpointer restore_stack_protection_tramp = NULL;
92 static void try_more_restore (void);
93 static void restore_stack_protection (void);
94 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
95 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
96 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
99 mono_exceptions_init (void)
101 MonoRuntimeExceptionHandlingCallbacks cbs;
103 restore_context_func = mono_aot_get_trampoline ("restore_context");
104 call_filter_func = mono_aot_get_trampoline ("call_filter");
105 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
106 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
110 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
111 mono_tramp_info_register (info, NULL);
112 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
113 mono_tramp_info_register (info, NULL);
114 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
115 mono_tramp_info_register (info, NULL);
116 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
117 mono_tramp_info_register (info, NULL);
119 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
120 if (!mono_llvm_only) {
121 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
122 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
126 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
127 mono_arch_exceptions_init ();
129 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
130 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
133 cbs.mono_raise_exception = mono_llvm_raise_exception;
135 cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
136 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
137 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
138 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
139 mono_install_eh_callbacks (&cbs);
143 mono_get_throw_exception (void)
145 g_assert (throw_exception_func);
146 return throw_exception_func;
150 mono_get_rethrow_exception (void)
152 g_assert (rethrow_exception_func);
153 return rethrow_exception_func;
157 mono_get_call_filter (void)
159 g_assert (call_filter_func);
160 return call_filter_func;
164 mono_get_restore_context (void)
166 g_assert (restore_context_func);
167 return restore_context_func;
171 mono_get_throw_corlib_exception (void)
173 gpointer code = NULL;
176 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
177 if (throw_corlib_exception_func)
178 return throw_corlib_exception_func;
181 code = mono_aot_get_trampoline ("throw_corlib_exception");
183 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
184 mono_tramp_info_register (info, NULL);
187 mono_memory_barrier ();
189 throw_corlib_exception_func = code;
191 return throw_corlib_exception_func;
195 * mono_get_throw_exception_addr:
197 * Return an address which stores the result of
198 * mono_get_throw_exception.
201 mono_get_throw_exception_addr (void)
203 return &throw_exception_func;
207 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
209 MonoTryBlockHoleTableJitInfo *table;
214 if (ei->try_start > ip || ip >= ei->try_end)
217 if (!ji->has_try_block_holes)
220 table = mono_jit_info_get_try_block_hole_table_info (ji);
221 offset = (guint32)((char*)ip - (char*)ji->code_start);
222 clause = (guint16)(ei - ji->clauses);
223 g_assert (clause < ji->num_clauses);
225 for (i = 0; i < table->num_holes; ++i) {
226 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
227 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
233 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
236 static gboolean show_native_addresses = TRUE;
238 static gboolean show_native_addresses = FALSE;
241 static _Unwind_Reason_Code
242 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
244 MonoDomain *domain = mono_domain_get ();
245 uintptr_t ip = _Unwind_GetIP (frame_ctx);
247 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
248 GList **trace_ips = (GList **)state;
249 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
252 return _URC_NO_REASON;
256 get_unwind_backtrace (void)
260 _Unwind_Backtrace (build_stack_trace, &ips);
262 return g_slist_reverse (ips);
268 get_unwind_backtrace (void)
278 * Translate between the mono_arch_unwind_frame function and the old API.
281 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
282 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
284 StackFrameInfo frame;
287 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
289 /* Avoid costly table lookup during stack overflow */
290 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
293 ji = mini_jit_info_table_find (domain, (char *)ip, NULL);
298 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
300 return (MonoJitInfo *)-1;
302 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
304 * Remove any unused lmf.
305 * Mask out the lower bits which might be used to hold additional information.
307 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
310 /* Convert between the new and the old APIs */
311 switch (frame.type) {
312 case FRAME_TYPE_MANAGED:
316 case FRAME_TYPE_TRAMPOLINE:
318 case FRAME_TYPE_MANAGED_TO_NATIVE:
322 memset (res, 0, sizeof (MonoJitInfo));
323 res->d.method = frame.method;
326 case FRAME_TYPE_DEBUGGER_INVOKE: {
330 * The normal exception handling code can't handle this frame, so just
333 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
334 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
338 g_assert_not_reached ();
343 /* mono_find_jit_info:
345 * This function is used to gather information from @ctx. It return the
346 * MonoJitInfo of the corresponding function, unwinds one stack frame and
347 * stores the resulting context into @new_ctx. It also stores a string
348 * describing the stack location into @trace (if not NULL), and modifies
349 * the @lmf if necessary. @native_offset return the IP offset from the
350 * start of the function or -1 if that info is not available.
353 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
354 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
358 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
360 MonoMethod *method = NULL;
371 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
373 if (ji == (gpointer)-1)
376 if (ji && !ji->is_trampoline)
377 method = jinfo_get_method (ji);
379 if (managed2 || (method && method->wrapper_type)) {
380 const char *real_ip, *start;
383 start = (const char *)ji->code_start;
385 /* ctx->ip points into native code */
386 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
388 real_ip = (const char*)ip;
390 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
391 offset = real_ip - start;
396 *native_offset = offset;
399 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
403 *trace = mono_debug_print_stack_frame (method, offset, domain);
406 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
407 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
416 * mono_find_jit_info_ext:
418 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
420 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
421 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
422 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
423 * to obtain the last managed frame.
424 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
425 * On return, it will be filled with the locations where callee saved registers are saved
426 * by the current frame. This is returned outside of StackFrameInfo because it can be
427 * quite large on some platforms.
428 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
432 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
433 MonoJitInfo *prev_ji, MonoContext *ctx,
434 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
435 mgreg_t **save_locations,
436 StackFrameInfo *frame)
439 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
441 MonoDomain *target_domain = domain;
442 MonoMethod *method = NULL;
443 gboolean async = mono_thread_info_is_async_context ();
448 /* Avoid costly table lookup during stack overflow */
449 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
452 ji = mini_jit_info_table_find (domain, (char *)ip, &target_domain);
455 target_domain = domain;
458 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
460 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
464 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
466 * Remove any unused lmf.
467 * Mask out the lower bits which might be used to hold additional information.
469 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
472 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
473 method = jinfo_get_method (frame->ji);
475 if (frame->type == FRAME_TYPE_MANAGED && method) {
476 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
477 frame->managed = TRUE;
480 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
482 * This type of frame is just a marker, the caller should unwind once more to get the
483 * last managed frame.
486 frame->method = NULL;
489 frame->native_offset = -1;
490 frame->domain = target_domain;
491 frame->async_context = async;
495 if (frame->type == FRAME_TYPE_MANAGED)
496 frame->method = method;
498 if (ji && (frame->managed || (method && method->wrapper_type))) {
499 const char *real_ip, *start;
501 start = (const char *)ji->code_start;
502 if (frame->type == FRAME_TYPE_MANAGED)
503 real_ip = (const char*)ip;
505 /* ctx->ip points into native code */
506 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
508 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
509 frame->native_offset = real_ip - start;
511 frame->native_offset = -1;
515 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
517 if (trace && frame->method) {
518 char *fname = mono_method_full_name (frame->method, TRUE);
519 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
528 * This function is async-safe.
531 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
533 MonoGenericJitInfo *gi;
537 if (!ji->has_generic_jit_info)
539 gi = mono_jit_info_get_generic_jit_info (ji);
545 * Search location list if available, it contains the precise location of the
546 * argument for every pc offset, even if the method was interrupted while it was in
550 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
553 for (i = 0; i < gi->nlocs; ++i) {
554 MonoDwarfLocListEntry *entry = &gi->locations [i];
556 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
558 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
560 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
564 g_assert (i < gi->nlocs);
567 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
569 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
573 method = jinfo_get_method (ji);
574 if (mono_method_get_context (method)->method_inst) {
575 /* A MonoMethodRuntimeGenericContext* */
577 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
581 /* Avoid returning a managed object */
582 MonoObject *this_obj = (MonoObject *)info;
584 return this_obj->vtable;
589 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
591 static MonoGenericContext
592 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
594 MonoGenericContext context = { NULL, NULL };
595 MonoClass *klass, *method_container_class;
598 g_assert (generic_info);
600 method = jinfo_get_method (ji);
601 g_assert (method->is_inflated);
602 if (mono_method_get_context (method)->method_inst) {
603 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
605 klass = mrgctx->class_vtable->klass;
606 context.method_inst = mrgctx->method_inst;
607 g_assert (context.method_inst);
609 MonoVTable *vtable = (MonoVTable *)generic_info;
611 klass = vtable->klass;
614 //g_assert (!method->klass->generic_container);
615 if (method->klass->generic_class)
616 method_container_class = method->klass->generic_class->container_class;
618 method_container_class = method->klass;
620 /* class might refer to a subclass of method's class */
621 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
622 klass = klass->parent;
626 if (klass->generic_class || klass->generic_container)
627 context.class_inst = mini_class_get_context (klass)->class_inst;
629 if (klass->generic_class)
630 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
632 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
638 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
641 MonoGenericContext context;
644 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
645 return jinfo_get_method (ji);
646 context = get_generic_context_from_stack_frame (ji, generic_info);
648 method = jinfo_get_method (ji);
649 method = mono_method_get_declaring_generic_method (method);
650 method = mono_class_inflate_generic_method_checked (method, &context, &error);
651 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
657 * mono_exception_walk_native_trace:
658 * @ex: The exception object whose frames should be walked
659 * @func: callback to call for each stack frame
660 * @user_data: data passed to the callback
662 * This function walks the stacktrace of an exception. For
663 * each frame the callback function is called with the relevant info.
664 * The walk ends when no more stack frames are found or when the callback
665 * returns a TRUE value.
669 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
671 MONO_REQ_GC_UNSAFE_MODE;
673 MonoDomain *domain = mono_domain_get ();
674 MonoArray *ta = ex->trace_ips;
680 len = mono_array_length (ta) >> 1;
681 for (i = 0; i < len; i++) {
682 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
683 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
684 MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)ip);
687 if (func (NULL, ip, 0, FALSE, user_data))
690 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
691 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
700 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
703 MonoDomain *domain = mono_domain_get ();
705 MonoArray *ta = exc->trace_ips;
706 MonoDebugSourceLocation *location;
710 /* Exception is not thrown yet */
711 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, &error);
712 mono_error_set_pending_exception (&error);
716 len = mono_array_length (ta) >> 1;
718 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, &error);
719 if (mono_error_set_pending_exception (&error))
722 for (i = skip; i < len; i++) {
724 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, &error);
725 if (!mono_error_ok (&error)) {
726 mono_error_set_pending_exception (&error);
729 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
730 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
733 ji = mono_jit_info_table_find (domain, (char *)ip);
735 /* Unmanaged frame */
736 mono_array_setref (res, i, sf);
740 g_assert (ji != NULL);
743 /* Can't resolve actual method */
744 method = jinfo_get_method (ji);
746 method = get_method_from_stack_frame (ji, generic_info);
747 if (jinfo_get_method (ji)->wrapper_type) {
751 s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
752 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
756 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, &error);
757 if (!mono_error_ok (&error)) {
758 mono_error_set_pending_exception (&error);
761 MONO_OBJECT_SETREF (sf, method, rm);
764 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
765 sf->method_address = (gsize) ji->code_start;
766 sf->native_offset = (char *)ip - (char *)ji->code_start;
769 * mono_debug_lookup_source_location() returns both the file / line number information
770 * and the IL offset. Note that computing the IL offset is already an expensive
771 * operation, so we shouldn't call this method twice.
773 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
775 sf->il_offset = location->il_offset;
778 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
779 sf->il_offset = sp.il_offset;
784 if (need_file_info) {
785 if (location && location->source_file) {
786 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
787 sf->line = location->row;
788 sf->column = location->column;
790 sf->line = sf->column = 0;
795 mono_debug_free_source_location (location);
796 mono_array_setref (res, i, sf);
803 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
806 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
807 if (jit_tls && jit_tls->orig_ex_ctx_set)
808 start_ctx = &jit_tls->orig_ex_ctx;
810 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
813 * mono_walk_stack_with_ctx:
815 * Unwind the current thread starting at @start_ctx.
817 * If @start_ctx is null, we capture the current context.
820 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
822 MonoContext extra_ctx;
823 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
824 MONO_ARCH_CONTEXT_DEF
826 if (!thread || !thread->jit_data)
830 mono_arch_flush_register_windows ();
832 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
833 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
835 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
837 start_ctx = &extra_ctx;
840 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
844 * mono_walk_stack_with_state:
846 * Unwind a thread described by @state.
848 * State must be valid (state->valid == TRUE).
850 * If you are using this function to unwind another thread, make sure it is suspended.
852 * If @state is null, we capture the current context.
855 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
857 MonoThreadUnwindState extra_state;
859 g_assert (!mono_thread_info_is_async_context ());
860 if (!mono_thread_state_init_from_current (&extra_state))
862 state = &extra_state;
865 g_assert (state->valid);
867 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
871 mono_walk_stack_full (func,
873 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
874 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
875 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
876 unwind_options, user_data);
880 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
882 MonoThreadUnwindState state;
883 if (!mono_thread_state_init_from_current (&state))
885 mono_walk_stack_with_state (func, &state, options, user_data);
889 * mono_walk_stack_full:
890 * @func: callback to call for each stack frame
891 * @domain: starting appdomain, can be NULL to use the current domain
892 * @unwind_options: what extra information the unwinder should gather
893 * @start_ctx: starting state of the stack walk, can be NULL.
894 * @thread: the thread whose stack to walk, can be NULL to use the current thread
895 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
896 * @user_data: data passed to the callback
898 * This function walks the stack of a thread, starting from the state
899 * represented by start_ctx. For each frame the callback
900 * function is called with the relevant info. The walk ends when no more
901 * managed stack frames are found or when the callback returns a TRUE value.
904 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
907 MonoContext ctx, new_ctx;
908 StackFrameInfo frame;
910 mgreg_t *reg_locations [MONO_MAX_IREGS];
911 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
912 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
913 gboolean async = mono_thread_info_is_async_context ();
915 if (mono_llvm_only) {
921 ips = get_unwind_backtrace ();
922 for (l = ips; l; l = l->next) {
923 guint8 *ip = (guint8*)l->data;
924 memset (&frame, 0, sizeof (StackFrameInfo));
925 frame.ji = mini_jit_info_table_find (domain, (char*)ip, &frame.domain);
926 if (!frame.ji || frame.ji->is_trampoline)
928 frame.type = FRAME_TYPE_MANAGED;
929 frame.method = jinfo_get_method (frame.ji);
930 // FIXME: Cannot lookup the actual method
931 frame.actual_method = frame.method;
932 if (frame.type == FRAME_TYPE_MANAGED) {
933 if (!frame.method->wrapper_type || frame.method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
934 frame.managed = TRUE;
936 frame.native_offset = ip - (guint8*)frame.ji->code_start;
937 frame.il_offset = -1;
939 if (func (&frame, NULL, user_data))
946 g_assert (start_ctx);
949 /*The LMF will be null if the target have no managed frames.*/
950 /* g_assert (lmf); */
953 g_assert (unwind_options == MONO_UNWIND_NONE);
955 memcpy (&ctx, start_ctx, sizeof (MonoContext));
956 memset (reg_locations, 0, sizeof (reg_locations));
958 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
960 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
964 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
965 MonoDebugSourceLocation *source;
967 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
969 il_offset = source->il_offset;
972 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
973 il_offset = sp.il_offset;
977 mono_debug_free_source_location (source);
981 frame.il_offset = il_offset;
983 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
984 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
986 frame.actual_method = frame.method;
989 if (get_reg_locations)
990 frame.reg_locations = reg_locations;
992 if (func (&frame, &ctx, user_data))
995 if (get_reg_locations) {
996 for (i = 0; i < MONO_MAX_IREGS; ++i)
997 if (new_reg_locations [i])
998 reg_locations [i] = new_reg_locations [i];
1006 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
1007 MonoReflectionMethod **method,
1008 gint32 *iloffset, gint32 *native_offset,
1009 MonoString **file, gint32 *line, gint32 *column)
1012 MonoDomain *domain = mono_domain_get ();
1013 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1014 MonoLMF *lmf = mono_get_lmf ();
1015 MonoJitInfo *ji = NULL;
1016 MonoContext ctx, new_ctx;
1017 MonoDebugSourceLocation *location;
1018 MonoMethod *jmethod = NULL, *actual_method;
1019 StackFrameInfo frame;
1022 MONO_ARCH_CONTEXT_DEF;
1024 if (mono_llvm_only) {
1026 MonoDomain *frame_domain;
1027 guint8 *frame_ip = NULL;
1029 /* FIXME: Generalize this code with an interface which returns an array of StackFrame structures */
1031 ips = get_unwind_backtrace ();
1032 for (l = ips; l && skip >= 0; l = l->next) {
1033 guint8 *ip = (guint8*)l->data;
1037 ji = mini_jit_info_table_find (mono_domain_get (), (char*)ip, &frame_domain);
1038 if (!ji || ji->is_trampoline)
1041 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1042 jmethod = jinfo_get_method (ji);
1043 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1050 /* No way to resolve generic instances */
1051 actual_method = jmethod;
1052 *native_offset = frame_ip - (guint8*)ji->code_start;
1054 mono_arch_flush_register_windows ();
1056 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1057 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1059 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
1065 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1069 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1070 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1071 frame.type == FRAME_TYPE_TRAMPOLINE)
1075 *native_offset = frame.native_offset;
1077 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1078 jmethod = jinfo_get_method (ji);
1079 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1082 } while (skip >= 0);
1084 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
1087 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, actual_method, NULL, &error);
1088 if (!mono_error_ok (&error)) {
1089 mono_error_set_pending_exception (&error);
1092 mono_gc_wbarrier_generic_store (method, (MonoObject*) rm);
1094 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
1096 *iloffset = location->il_offset;
1100 if (need_file_info) {
1102 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
1103 *line = location->row;
1104 *column = location->column;
1107 *line = *column = 0;
1111 mono_debug_free_source_location (location);
1117 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1120 MonoClass *catch_class = ei->data.catch_class;
1121 MonoType *inflated_type;
1122 MonoGenericContext context;
1124 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1125 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1128 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1130 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1132 /* FIXME: we shouldn't inflate but instead put the
1133 type in the rgctx and fetch it from there. It
1134 might be a good idea to do this lazily, i.e. only
1135 when the exception is actually thrown, so as not to
1136 waste space for exception clauses which might never
1138 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
1139 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1141 catch_class = mono_class_from_mono_type (inflated_type);
1142 mono_metadata_free_type (inflated_type);
1148 * mini_jit_info_table_find_ext:
1150 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1151 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1152 * OUT_DOMAIN if it is not NULL.
1155 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1158 MonoInternalThread *t = mono_thread_internal_current ();
1164 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1167 *out_domain = domain;
1171 /* maybe it is shared code, so we also search in the root domain */
1172 if (domain != mono_get_root_domain ()) {
1173 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1176 *out_domain = mono_get_root_domain ();
1184 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1185 for (; refs && *refs; refs++) {
1186 if (*refs != domain && *refs != mono_get_root_domain ()) {
1187 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1190 *out_domain = (MonoDomain*) *refs;
1200 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1202 return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
1205 /* Class lazy loading functions */
1206 static GENERATE_GET_CLASS_WITH_CACHE (runtime_compat_attr, System.Runtime.CompilerServices, RuntimeCompatibilityAttribute)
1209 * wrap_non_exception_throws:
1211 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1212 * WrapNonExceptionThrows flag set.
1215 wrap_non_exception_throws (MonoMethod *m)
1218 MonoAssembly *ass = m->klass->image->assembly;
1219 MonoCustomAttrInfo* attrs;
1222 gboolean val = FALSE;
1225 if (ass->wrap_non_exception_throws_inited)
1226 return ass->wrap_non_exception_throws;
1228 klass = mono_class_get_runtime_compat_attr_class ();
1230 attrs = mono_custom_attrs_from_assembly_checked (ass, &error);
1231 mono_error_cleanup (&error); /* FIXME don't swallow the error */
1233 for (i = 0; i < attrs->num_attrs; ++i) {
1234 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1236 int num_named, named_type, name_len;
1239 if (!attr->ctor || attr->ctor->klass != klass)
1241 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1242 p = (const char*)attr->data;
1243 g_assert (read16 (p) == 0x0001);
1245 num_named = read16 (p);
1251 /* data_type = *p; */
1254 if (named_type != 0x54)
1256 name_len = mono_metadata_decode_blob_size (p, &p);
1257 name = (char *)g_malloc (name_len + 1);
1258 memcpy (name, p, name_len);
1259 name [name_len] = 0;
1261 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1263 /* The value is a BOOLEAN */
1266 mono_custom_attrs_free (attrs);
1269 ass->wrap_non_exception_throws = val;
1270 mono_memory_barrier ();
1271 ass->wrap_non_exception_throws_inited = TRUE;
1276 #ifndef MONO_ARCH_STACK_GROWS_UP
1277 #define DOES_STACK_GROWS_UP 1
1279 #define DOES_STACK_GROWS_UP 0
1282 #define MAX_UNMANAGED_BACKTRACE 128
1284 build_native_trace (MonoError *error)
1286 mono_error_init (error);
1287 /* This puppy only makes sense on mobile, IOW, ARM. */
1288 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1290 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1291 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1296 res = mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, size, error);
1297 return_val_if_nok (error, NULL);
1299 for (i = 0; i < size; i++)
1300 mono_array_set (res, gpointer, i, native_trace [i]);
1308 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1310 if (mono_ex && !initial_trace_ips) {
1311 *trace_ips = g_list_reverse (*trace_ips);
1313 MonoArray *ips_arr = mono_glist_to_array (*trace_ips, mono_defaults.int_class, &error);
1314 mono_error_assert_ok (&error);
1315 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
1316 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace (&error));
1317 mono_error_assert_ok (&error);
1318 if (dynamic_methods) {
1319 /* These methods could go away anytime, so save a reference to them in the exception object */
1321 MonoMList *list = NULL;
1323 for (l = dynamic_methods; l; l = l->next) {
1325 MonoDomain *domain = mono_domain_get ();
1327 if (domain->method_to_dyn_method) {
1328 mono_domain_lock (domain);
1329 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1330 mono_domain_unlock (domain);
1332 MonoObject *o = mono_gchandle_get_target (dis_link);
1334 list = mono_mlist_prepend_checked (list, o, &error);
1335 mono_error_assert_ok (&error);
1341 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1344 g_list_free (*trace_ips);
1349 * mono_handle_exception_internal_first_pass:
1351 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1352 * OBJ is found. Run the index of the filter clause which caught the exception into
1353 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1356 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1359 MonoDomain *domain = mono_domain_get ();
1360 MonoJitInfo *ji = NULL;
1361 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1362 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1363 MonoLMF *lmf = mono_get_lmf ();
1364 MonoArray *initial_trace_ips = NULL;
1365 GList *trace_ips = NULL;
1366 GSList *dynamic_methods = NULL;
1367 MonoException *mono_ex;
1368 gboolean stack_overflow = FALSE;
1369 MonoContext initial_ctx;
1371 int frame_count = 0;
1376 g_assert (ctx != NULL);
1378 if (obj == (MonoObject *)domain->stack_overflow_ex)
1379 stack_overflow = TRUE;
1381 mono_ex = (MonoException*)obj;
1382 initial_trace_ips = mono_ex->trace_ips;
1384 if (mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1385 mono_ex = (MonoException*)obj;
1386 initial_trace_ips = mono_ex->trace_ips;
1388 mono_error_assert_ok (&error);
1393 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1395 g_assert (jit_tls->end_of_stack);
1396 g_assert (jit_tls->abort_func);
1399 *out_filter_idx = -1;
1403 *out_prev_ji = NULL;
1408 MonoContext new_ctx;
1410 int clause_index_start = 0;
1411 gboolean unwind_res = TRUE;
1413 StackFrameInfo frame;
1418 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1420 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1421 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1422 frame.type == FRAME_TYPE_TRAMPOLINE) {
1426 g_assert (frame.type == FRAME_TYPE_MANAGED);
1431 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1432 g_slist_free (dynamic_methods);
1437 method = jinfo_get_method (ji);
1438 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1440 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1441 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1442 "The native frame called the managed method:\n%s\n",
1443 mono_method_full_name (method, TRUE));
1446 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1448 * Avoid overwriting the stack trace if the exception is
1449 * rethrown. Also avoid giant stack traces during a stack
1452 if (!initial_trace_ips && (frame_count < 1000)) {
1453 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1454 trace_ips = g_list_prepend (trace_ips,
1455 get_generic_info_from_stack_frame (ji, ctx));
1459 if (method->dynamic)
1460 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1462 if (stack_overflow) {
1463 if (DOES_STACK_GROWS_UP)
1464 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1466 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1468 free_stack = 0xffffff;
1471 for (i = clause_index_start; i < ji->num_clauses; i++) {
1472 MonoJitExceptionInfo *ei = &ji->clauses [i];
1473 gboolean filtered = FALSE;
1476 * During stack overflow, wait till the unwinding frees some stack
1477 * space before running handlers/finalizers.
1479 if (free_stack <= (64 * 1024))
1482 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1484 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1487 * Have to unwrap RuntimeWrappedExceptions if the
1488 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1490 if (non_exception && !wrap_non_exception_throws (method))
1491 ex_obj = non_exception;
1495 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1496 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1497 #ifndef DISABLE_PERFCOUNTERS
1498 mono_perfcounters->exceptions_filters++;
1501 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1502 trim the stackframe since if it returns FALSE we lose information.
1504 FIXME Not 100% sure if it's a good idea even with user clauses.
1507 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1509 #ifndef MONO_CROSS_COMPILE
1510 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1512 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1514 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1515 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1517 g_assert (!ji->from_llvm);
1518 /* store the exception object in bp + ei->exvar_offset */
1519 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1523 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1525 * Pass the original il clause index to the landing pad so it can
1526 * branch to the landing pad associated with the il clause.
1527 * This is needed because llvm compiled code assumes that the EH
1528 * code always branches to the innermost landing pad.
1531 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1534 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1535 filtered = call_filter (ctx, ei->data.filter);
1536 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1537 if (filtered && out_filter_idx)
1538 *out_filter_idx = filter_idx;
1545 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1546 g_slist_free (dynamic_methods);
1547 /* mono_debugger_agent_handle_exception () needs this */
1548 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1553 MonoError isinst_error;
1554 mono_error_init (&isinst_error);
1555 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (ex_obj, catch_class, &error)) {
1556 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1557 g_slist_free (dynamic_methods);
1562 /* mono_debugger_agent_handle_exception () needs this */
1563 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1566 mono_error_cleanup (&isinst_error);
1573 g_assert_not_reached ();
1577 * mono_handle_exception_internal:
1578 * @ctx: saved processor state
1579 * @obj: the exception object
1580 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1583 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1586 MonoDomain *domain = mono_domain_get ();
1587 MonoJitInfo *ji, *prev_ji;
1588 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1589 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1590 MonoLMF *lmf = mono_get_lmf ();
1591 MonoException *mono_ex;
1592 gboolean stack_overflow = FALSE;
1593 MonoContext initial_ctx;
1595 int frame_count = 0;
1596 gint32 filter_idx, first_filter_idx = 0;
1599 MonoObject *non_exception = NULL;
1601 g_assert (ctx != NULL);
1603 MonoException *ex = mono_get_exception_null_reference ();
1604 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1605 obj = (MonoObject *)ex;
1609 * Allocate a new exception object instead of the preconstructed ones.
1611 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1613 * It is not a good idea to try and put even more pressure on the little stack available.
1614 * obj = mono_get_exception_stack_overflow ();
1616 stack_overflow = TRUE;
1618 else if (obj == (MonoObject *)domain->null_reference_ex) {
1619 obj = (MonoObject *)mono_get_exception_null_reference ();
1622 if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1623 mono_error_assert_ok (&error);
1624 non_exception = obj;
1625 obj = (MonoObject *)mono_get_exception_runtime_wrapped_checked (obj, &error);
1626 mono_error_assert_ok (&error);
1629 mono_ex = (MonoException*)obj;
1631 if (mini_get_debug_options ()->suspend_on_exception) {
1632 mono_runtime_printf_err ("Exception thrown, suspending...");
1637 if (mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1638 mono_ex = (MonoException*)obj;
1640 mono_error_assert_ok (&error);
1644 if (mono_ex && jit_tls->class_cast_from) {
1645 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1646 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1647 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1648 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1649 mono_ex->message = mono_string_new (domain, msg);
1654 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1655 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1656 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1657 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1658 mono_ex->message = mono_string_new (domain, msg);
1666 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1668 g_assert (jit_tls->end_of_stack);
1669 g_assert (jit_tls->abort_func);
1672 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1673 * end up being TRUE on any code path.
1675 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1680 MonoContext ctx_cp = *ctx;
1681 if (mono_trace_is_enabled ()) {
1682 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1683 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1684 MonoObject *message;
1685 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1687 if (get_message == NULL) {
1689 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1691 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1693 MonoObject *exc = NULL;
1694 message = mono_runtime_try_invoke (get_message, obj, NULL, &exc, &error);
1695 g_assert (exc == NULL);
1696 mono_error_assert_ok (&error);
1700 msg = mono_string_to_utf8_checked ((MonoString *) message, &error);
1701 if (!is_ok (&error)) {
1702 mono_error_cleanup (&error);
1703 msg = g_strdup ("(error while display System.Exception.Message property)");
1706 msg = g_strdup ("(System.Exception.Message property not available)");
1709 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);
1711 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1712 mono_print_thread_dump_from_ctx (ctx);
1714 jit_tls->orig_ex_ctx_set = TRUE;
1715 mono_profiler_exception_thrown (obj);
1716 jit_tls->orig_ex_ctx_set = FALSE;
1718 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1721 if (mini_get_debug_options ()->break_on_exc)
1723 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1725 if (mini_get_debug_options ()->suspend_on_unhandled) {
1726 mono_runtime_printf_err ("Unhandled exception, suspending...");
1731 // FIXME: This runs managed code so it might cause another stack overflow when
1732 // we are handling a stack overflow
1733 mono_unhandled_exception (obj);
1735 gboolean unhandled = FALSE;
1738 * The exceptions caught by the mono_runtime_invoke_checked () calls
1739 * in the threadpool needs to be treated as unhandled (#669836).
1741 * FIXME: The check below is hackish, but its hard to distinguish
1742 * these runtime invoke calls from others in the runtime.
1744 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1745 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1750 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1752 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1762 MonoContext new_ctx;
1764 int clause_index_start = 0;
1765 gboolean unwind_res = TRUE;
1769 ji = jit_tls->resume_state.ji;
1770 new_ctx = jit_tls->resume_state.new_ctx;
1771 clause_index_start = jit_tls->resume_state.clause_index;
1772 lmf = jit_tls->resume_state.lmf;
1773 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1774 filter_idx = jit_tls->resume_state.filter_idx;
1776 StackFrameInfo frame;
1778 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1780 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1781 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1782 frame.type == FRAME_TYPE_TRAMPOLINE) {
1786 g_assert (frame.type == FRAME_TYPE_MANAGED);
1792 *(mono_get_lmf_addr ()) = lmf;
1794 jit_tls->abort_func (obj);
1795 g_assert_not_reached ();
1798 method = jinfo_get_method (ji);
1800 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1802 if (stack_overflow) {
1803 if (DOES_STACK_GROWS_UP)
1804 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1806 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1808 free_stack = 0xffffff;
1811 for (i = clause_index_start; i < ji->num_clauses; i++) {
1812 MonoJitExceptionInfo *ei = &ji->clauses [i];
1813 gboolean filtered = FALSE;
1816 * During stack overflow, wait till the unwinding frees some stack
1817 * space before running handlers/finalizers.
1819 if (free_stack <= (64 * 1024))
1822 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1824 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1827 * Have to unwrap RuntimeWrappedExceptions if the
1828 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1830 if (non_exception && !wrap_non_exception_throws (method))
1831 ex_obj = non_exception;
1835 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1836 #ifndef MONO_CROSS_COMPILE
1837 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1838 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1840 g_assert (!ji->from_llvm);
1841 /* store the exception object in bp + ei->exvar_offset */
1842 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1847 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1849 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1852 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1854 * Filter clauses should only be run in the
1855 * first pass of exception handling.
1857 filtered = (filter_idx == first_filter_idx);
1861 mono_error_init (&error);
1862 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1863 mono_object_isinst_checked (ex_obj, catch_class, &error)) || filtered) {
1865 * This guards against the situation that we abort a thread that is executing a finally clause
1866 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1867 * check for this situation here and resume interruption if we are below the guarded block.
1869 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1870 gboolean is_outside = FALSE;
1871 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1872 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1873 //FIXME make this stack direction aware
1874 if (catch_bp > prot_bp) {
1876 } else if (catch_bp == prot_bp) {
1877 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1878 * So we check if the catch handler_start is protected by the guarded handler protected region
1881 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1882 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1883 * There aren't any further finally/fault handler blocks down the stack over this exception.
1884 * This must be ensured by the code that installs the guard trampoline.
1886 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1888 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1893 jit_tls->handler_block_return_address = NULL;
1894 jit_tls->handler_block = NULL;
1895 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1899 if (mono_trace_is_enabled () && mono_trace_eval (method))
1900 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1901 jit_tls->orig_ex_ctx_set = TRUE;
1902 mono_profiler_exception_clause_handler (method, ei->flags, i);
1903 jit_tls->orig_ex_ctx_set = FALSE;
1904 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1906 #ifndef DISABLE_PERFCOUNTERS
1907 mono_perfcounters->exceptions_depth += frame_count;
1909 if (obj == (MonoObject *)domain->stack_overflow_ex)
1910 jit_tls->handling_stack_ovf = FALSE;
1914 mono_error_cleanup (&error);
1915 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1916 if (mono_trace_is_enabled () && mono_trace_eval (method))
1917 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1918 jit_tls->orig_ex_ctx_set = TRUE;
1919 mono_profiler_exception_clause_handler (method, ei->flags, i);
1920 jit_tls->orig_ex_ctx_set = FALSE;
1921 call_filter (ctx, ei->handler_start);
1923 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1924 if (mono_trace_is_enabled () && mono_trace_eval (method))
1925 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1926 jit_tls->orig_ex_ctx_set = TRUE;
1927 mono_profiler_exception_clause_handler (method, ei->flags, i);
1928 jit_tls->orig_ex_ctx_set = FALSE;
1929 #ifndef DISABLE_PERFCOUNTERS
1930 mono_perfcounters->exceptions_finallys++;
1933 if (ji->from_llvm) {
1935 * LLVM compiled finally handlers follow the design
1936 * of the c++ ehabi, i.e. they call a resume function
1937 * at the end instead of returning to the caller.
1938 * So save the exception handling state,
1939 * mono_resume_unwind () will call us again to continue
1942 jit_tls->resume_state.ex_obj = obj;
1943 jit_tls->resume_state.ji = ji;
1944 jit_tls->resume_state.clause_index = i + 1;
1945 jit_tls->resume_state.ctx = *ctx;
1946 jit_tls->resume_state.new_ctx = new_ctx;
1947 jit_tls->resume_state.lmf = lmf;
1948 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1949 jit_tls->resume_state.filter_idx = filter_idx;
1950 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1953 call_filter (ctx, ei->handler_start);
1959 jit_tls->orig_ex_ctx_set = TRUE;
1960 mono_profiler_exception_method_leave (method);
1961 jit_tls->orig_ex_ctx_set = FALSE;
1966 g_assert_not_reached ();
1970 * mono_debugger_run_finally:
1971 * @start_ctx: saved processor state
1973 * This method is called by the Mono Debugger to call all `finally' clauses of the
1974 * current stack frame. It's used when the user issues a `return' command to make
1975 * the current stack frame return. After returning from this method, the debugger
1976 * unwinds the stack one frame and gives control back to the user.
1978 * NOTE: This method is only used when running inside the Mono Debugger.
1981 mono_debugger_run_finally (MonoContext *start_ctx)
1983 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1984 MonoDomain *domain = mono_domain_get ();
1985 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1986 MonoLMF *lmf = mono_get_lmf ();
1987 MonoContext ctx, new_ctx;
1988 MonoJitInfo *ji, rji;
1993 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1994 if (!ji || ji == (gpointer)-1)
1998 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
2000 for (i = 0; i < ji->num_clauses; i++) {
2001 MonoJitExceptionInfo *ei = &ji->clauses [i];
2003 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
2004 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
2005 call_filter (&ctx, ei->handler_start);
2011 * mono_handle_exception:
2012 * @ctx: saved processor state
2013 * @obj: the exception object
2016 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
2018 MONO_REQ_GC_UNSAFE_MODE;
2020 #ifndef DISABLE_PERFCOUNTERS
2021 mono_perfcounters->exceptions_thrown++;
2024 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
2027 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2029 #ifndef MONO_ARCH_USE_SIGACTION
2030 #error "Can't use sigaltstack without sigaction"
2033 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
2036 mono_setup_altstack (MonoJitTlsData *tls)
2040 guint8 *staddr = NULL;
2042 if (mono_running_on_valgrind ())
2045 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2049 tls->end_of_stack = staddr + stsize;
2050 tls->stack_size = stsize;
2052 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
2054 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
2055 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
2057 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
2059 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
2060 /* mprotect can fail for the main thread stack */
2061 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);
2062 g_assert (gaddr == tls->stack_ovf_guard_base);
2063 tls->stack_ovf_valloced = TRUE;
2066 /* Setup an alternate signal stack */
2067 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
2068 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2070 g_assert (tls->signal_stack);
2072 sa.ss_sp = tls->signal_stack;
2073 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2075 g_assert (sigaltstack (&sa, NULL) == 0);
2077 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);
2081 mono_free_altstack (MonoJitTlsData *tls)
2086 sa.ss_sp = tls->signal_stack;
2087 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2088 sa.ss_flags = SS_DISABLE;
2089 err = sigaltstack (&sa, NULL);
2090 g_assert (err == 0);
2092 if (tls->signal_stack)
2093 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
2094 if (tls->stack_ovf_valloced)
2095 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
2097 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2100 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2103 mono_setup_altstack (MonoJitTlsData *tls)
2108 mono_free_altstack (MonoJitTlsData *tls)
2112 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2115 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2117 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2118 /* we need to leave some room for throwing the exception */
2119 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2120 unprotect_size -= mono_pagesize ();
2121 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2122 * is sufficient stack
2124 //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);
2126 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2127 return unprotect_size == jit_tls->stack_ovf_guard_size;
2130 static G_GNUC_UNUSED void
2131 try_more_restore (void)
2133 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2134 if (try_restore_stack_protection (jit_tls, 500))
2135 jit_tls->restore_stack_prot = NULL;
2138 static G_GNUC_UNUSED void
2139 restore_stack_protection (void)
2141 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2142 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2143 /* if we can't restore the stack protection, keep a callback installed so
2144 * we'll try to restore as much stack as we can at each return from unmanaged
2147 if (try_restore_stack_protection (jit_tls, 4096))
2148 jit_tls->restore_stack_prot = NULL;
2150 jit_tls->restore_stack_prot = try_more_restore_tramp;
2151 /* here we also throw a stack overflow exception */
2152 ex->trace_ips = NULL;
2153 ex->stack_trace = NULL;
2154 mono_raise_exception (ex);
2158 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2160 MONO_REQ_GC_UNSAFE_MODE;
2162 void (*func)(void) = (void (*)(void))tramp_data;
2168 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2173 /* we got a stack overflow in the soft-guard pages
2174 * There are two cases:
2175 * 1) managed code caused the overflow: we unprotect the soft-guard page
2176 * and let the arch-specific code trigger the exception handling mechanism
2177 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2178 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2179 * and hope we can continue with those enabled, at least until the hard-guard page
2180 * is hit. The alternative to continuing here is to just print a message and abort.
2181 * We may add in the future the code to protect the pages again in the codepath
2182 * when we return from unmanaged to managed code.
2184 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2185 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2186 /* we unprotect the minimum amount we can */
2188 gboolean handled = FALSE;
2190 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2191 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2192 guard_size -= mono_pagesize ();
2194 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2195 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2196 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);
2197 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2199 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2204 /* We print a message: after this even managed stack overflows
2205 * may crash the runtime
2207 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2208 if (!jit_tls->handling_stack_ovf) {
2209 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2210 jit_tls->handling_stack_ovf = 1;
2212 /*fprintf (stderr, "Already handling stack overflow\n");*/
2221 MonoMethod *omethod;
2223 } PrintOverflowUserData;
2225 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2227 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2229 MonoMethod *method = NULL;
2230 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2233 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2234 method = jinfo_get_method (frame->ji);
2237 if (user_data->count == 0) {
2238 /* The first frame is in its prolog, so a line number cannot be computed */
2239 user_data->count ++;
2243 /* If this is a one method overflow, skip the other instances */
2244 if (method == user_data->omethod)
2247 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2248 mono_runtime_printf_err (" %s", location);
2251 if (user_data->count == 1) {
2252 mono_runtime_printf_err (" <...>");
2253 user_data->omethod = method;
2255 user_data->omethod = NULL;
2258 user_data->count ++;
2260 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2267 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2269 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2270 PrintOverflowUserData ud;
2274 /* we don't do much now, but we can warn the user with a useful message */
2275 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2277 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2278 mono_sigctx_to_monoctx (ctx, &mctx);
2280 mono_runtime_printf_err ("Stacktrace:");
2282 memset (&ud, 0, sizeof (ud));
2284 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2286 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2287 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2289 mono_runtime_printf_err ("At <unmanaged>.");
2296 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2298 MonoMethod *method = NULL;
2300 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2301 method = jinfo_get_method (frame->ji);
2304 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2305 mono_runtime_printf_err (" %s", location);
2308 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2313 static G_GNUC_UNUSED gboolean
2314 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2316 GString *p = (GString*)data;
2317 MonoMethod *method = NULL;
2319 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2320 method = jinfo_get_method (frame->ji);
2322 if (method && frame->domain) {
2323 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2324 g_string_append_printf (p, " %s\n", location);
2327 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2332 #ifndef MONO_CROSS_COMPILE
2334 static gboolean handling_sigsegv = FALSE;
2337 * mono_handle_native_sigsegv:
2339 * Handle a SIGSEGV received while in native code by printing diagnostic
2340 * information and aborting.
2343 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2345 #ifdef MONO_ARCH_USE_SIGACTION
2346 struct sigaction sa;
2348 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2349 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2351 if (handling_sigsegv)
2354 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2355 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2366 /* To prevent infinite loops when the stack walk causes a crash */
2367 handling_sigsegv = TRUE;
2369 /* !jit_tls means the thread was not registered with the runtime */
2370 if (jit_tls && mono_thread_internal_current ()) {
2371 mono_runtime_printf_err ("Stacktrace:\n");
2373 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2374 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2377 #ifdef HAVE_BACKTRACE_SYMBOLS
2383 mono_runtime_printf_err ("\nNative stacktrace:\n");
2385 size = backtrace (array, 256);
2386 names = backtrace_symbols (array, size);
2387 for (i =0; i < size; ++i) {
2388 mono_runtime_printf_err ("\t%s", names [i]);
2392 /* Try to get more meaningful information using gdb */
2394 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2395 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2396 /* From g_spawn_command_line_sync () in eglib */
2399 pid_t crashed_pid = getpid ();
2403 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2404 * it will deadlock. Call the syscall directly instead.
2406 pid = mono_runtime_syscall_fork ();
2407 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2409 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2410 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2411 // distributions set the scope to 1 which allows attaching only to direct children of
2412 // the current process
2413 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2417 dup2 (STDERR_FILENO, STDOUT_FILENO);
2419 mono_gdb_render_native_backtraces (crashed_pid);
2423 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2424 waitpid (pid, &status, 0);
2429 mono_exception_native_unwind (ctx, info);
2433 * A SIGSEGV indicates something went very wrong so we can no longer depend
2434 * on anything working. So try to print out lots of diagnostics, starting
2435 * with ones which have a greater chance of working.
2437 mono_runtime_printf_err (
2439 "=================================================================\n"
2440 "Got a %s while executing native code. This usually indicates\n"
2441 "a fatal error in the mono runtime or one of the native libraries \n"
2442 "used by your application.\n"
2443 "=================================================================\n",
2447 #ifdef MONO_ARCH_USE_SIGACTION
2449 /* Remove our SIGABRT handler */
2450 sa.sa_handler = SIG_DFL;
2451 sigemptyset (&sa.sa_mask);
2454 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2458 if (!mono_do_crash_chaining) {
2459 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2460 #if defined (PLATFORM_ANDROID)
2471 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2473 g_assert_not_reached ();
2476 #endif /* !MONO_CROSS_COMPILE */
2479 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2481 MonoInternalThread *thread = mono_thread_internal_current ();
2482 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2487 GError *error = NULL;
2492 text = g_string_new (0);
2494 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2496 g_string_append_printf (text, "\n\"%s\"", name);
2499 else if (thread->threadpool_thread)
2500 g_string_append (text, "\n\"<threadpool thread>\"");
2502 g_string_append (text, "\n\"<unnamed thread>\"");
2504 g_string_append_printf (text, " tid=0x%p this=0x%p ", (gpointer)(gsize)thread->tid, thread);
2505 mono_thread_info_describe ((MonoThreadInfo*) thread->thread_info, text);
2506 g_string_append (text, "\n");
2508 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2510 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2512 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2514 mono_sigctx_to_monoctx (sigctx, &ctx);
2516 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2518 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2521 mono_runtime_printf ("%s", text->str);
2523 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2524 OutputDebugStringA(text->str);
2527 g_string_free (text, TRUE);
2528 mono_runtime_stdout_fflush ();
2532 * mono_print_thread_dump:
2534 * Print information about the current thread to stdout.
2535 * SIGCTX can be NULL, allowing this to be called from gdb.
2538 mono_print_thread_dump (void *sigctx)
2540 mono_print_thread_dump_internal (sigctx, NULL);
2544 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2546 mono_print_thread_dump_internal (NULL, ctx);
2550 * mono_resume_unwind:
2552 * This is called by a trampoline from LLVM compiled finally clauses to continue
2556 mono_resume_unwind (MonoContext *ctx)
2558 MONO_REQ_GC_UNSAFE_MODE;
2560 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2561 MonoContext new_ctx;
2563 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2564 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2567 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2569 mono_restore_context (&new_ctx);
2572 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2577 MonoJitExceptionInfo *ei;
2578 } FindHandlerBlockData;
2581 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2585 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2586 MonoJitInfo *ji = frame->ji;
2591 ip = MONO_CONTEXT_GET_IP (ctx);
2593 for (i = 0; i < ji->num_clauses; ++i) {
2594 MonoJitExceptionInfo *ei = ji->clauses + i;
2595 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2597 /*If ip points to the first instruction it means the handler block didn't start
2598 so we can leave its execution to the EH machinery*/
2599 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2611 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2614 MonoJitExceptionInfo *clause = NULL;
2617 ip = MONO_CONTEXT_GET_IP (ctx);
2619 for (i = 0; i < ji->num_clauses; ++i) {
2620 clause = &ji->clauses [i];
2621 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2623 if (clause->handler_start < ip && clause->data.handler_end > ip)
2627 /*no matching finally */
2628 if (i == ji->num_clauses)
2631 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2632 if (ip == clause->handler_start)
2635 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2639 * Finds the bottom handler block running and install a block guard if needed.
2642 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2644 FindHandlerBlockData data = { 0 };
2645 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2648 #ifndef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD_AOT
2653 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2654 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2656 if (!jit_tls || jit_tls->handler_block_return_address)
2659 /* Do an async safe stack walk */
2660 mono_thread_info_set_is_async_context (TRUE);
2661 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2662 mono_thread_info_set_is_async_context (FALSE);
2667 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2669 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2670 if (resume_ip == NULL)
2673 jit_tls->handler_block_return_address = resume_ip;
2674 jit_tls->handler_block = data.ei;
2681 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2689 mono_set_cast_details (MonoClass *from, MonoClass *to)
2691 MonoJitTlsData *jit_tls = NULL;
2693 if (mini_get_debug_options ()->better_cast_details) {
2694 jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2695 jit_tls->class_cast_from = from;
2696 jit_tls->class_cast_to = to;
2701 /*returns false if the thread is not attached*/
2703 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2705 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2706 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2714 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2716 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2717 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2718 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2721 mono_thread_state_init (ctx);
2724 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2730 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2736 mono_thread_state_init (MonoThreadUnwindState *ctx)
2738 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2740 #if defined(MONO_CROSS_COMPILE)
2741 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2742 #elif MONO_ARCH_HAS_MONO_CONTEXT
2743 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2745 g_error ("Use a null sigctx requires a working mono-context");
2748 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2749 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2750 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2756 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2758 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2765 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2766 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2767 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2772 /*returns false if the thread is not attached*/
2774 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2776 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2777 MONO_ARCH_CONTEXT_DEF
2779 mono_arch_flush_register_windows ();
2781 if (!thread || !thread->jit_data) {
2785 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2786 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2788 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2791 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2792 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2793 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2799 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2801 mono_handle_exception (ctx, (MonoObject *)exc);
2802 mono_restore_context (ctx);
2805 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2807 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2809 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2810 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2811 jit_tls->ex_ctx = *ctx;
2813 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2815 g_error ("This target doesn't support mono_arch_setup_async_callback");
2820 * mono_restore_context:
2822 * Call the architecture specific restore context function.
2825 mono_restore_context (MonoContext *ctx)
2827 static void (*restore_context) (MonoContext *);
2829 if (!restore_context)
2830 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
2831 restore_context (ctx);
2832 g_assert_not_reached ();
2836 * mono_jinfo_get_unwind_info:
2838 * Return the unwind info for JI.
2841 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2844 return mono_aot_get_unwind_info (ji, unwind_info_len);
2846 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2850 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2852 MonoArchEHJitInfo *info;
2854 info = mono_jit_info_get_arch_eh_info (ji);
2857 return info->epilog_size;
2861 * LLVM/Bitcode exception handling.
2865 throw_exception (MonoObject *ex, gboolean rethrow)
2867 MONO_REQ_GC_UNSAFE_MODE;
2870 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2871 MonoException *mono_ex;
2873 if (!mono_object_isinst_checked (ex, mono_defaults.exception_class, &error)) {
2874 mono_error_assert_ok (&error);
2875 mono_ex = mono_get_exception_runtime_wrapped_checked (ex, &error);
2876 mono_error_assert_ok (&error);
2877 jit_tls->thrown_non_exc = mono_gchandle_new (ex, FALSE);
2880 mono_ex = (MonoException*)ex;
2883 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2886 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2887 GList *l, *ips = NULL;
2890 _Unwind_Backtrace (build_stack_trace, &ips);
2891 /* The list contains ip-gshared info pairs */
2893 ips = g_list_reverse (ips);
2894 for (l = ips; l; l = l->next) {
2895 trace = g_list_append (trace, l->data);
2896 trace = g_list_append (trace, NULL);
2898 MonoArray *ips_arr = mono_glist_to_array (trace, mono_defaults.int_class, &error);
2899 mono_error_assert_ok (&error);
2900 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
2902 g_list_free (trace);
2906 mono_llvm_cpp_throw_exception ();
2910 mono_llvm_throw_exception (MonoObject *ex)
2912 throw_exception (ex, FALSE);
2916 mono_llvm_rethrow_exception (MonoObject *ex)
2918 throw_exception (ex, TRUE);
2922 mono_llvm_raise_exception (MonoException *e)
2924 mono_llvm_throw_exception ((MonoObject*)e);
2928 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2930 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2933 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2935 mono_llvm_throw_exception ((MonoObject*)ex);
2939 * mono_llvm_resume_exception:
2941 * Resume exception propagation.
2944 mono_llvm_resume_exception (void)
2946 mono_llvm_cpp_throw_exception ();
2950 * mono_llvm_load_exception:
2952 * Return the currently thrown exception.
2955 mono_llvm_load_exception (void)
2958 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2960 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2962 if (mono_ex->trace_ips) {
2963 GList *trace_ips = NULL;
2964 gpointer ip = __builtin_return_address (0);
2966 size_t upper = mono_array_length (mono_ex->trace_ips);
2968 for (int i = 0; i < upper; i+= 2) {
2969 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2970 gpointer curr_info = mono_array_get (mono_ex->trace_ips, gpointer, i + 1);
2971 trace_ips = g_list_append (trace_ips, curr_ip);
2972 trace_ips = g_list_append (trace_ips, curr_info);
2978 // FIXME: Does this work correctly for rethrows?
2979 // We may be discarding useful information
2980 // when this gets GC'ed
2981 MonoArray *ips_arr = mono_glist_to_array (trace_ips, mono_defaults.int_class, &error);
2982 mono_error_assert_ok (&error);
2983 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
2984 g_list_free (trace_ips);
2987 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2989 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, 0, &error));
2990 mono_error_assert_ok (&error);
2991 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new_checked (mono_domain_get (), mono_defaults.stack_frame_class, 0, &error));
2992 mono_error_assert_ok (&error);
2995 return &mono_ex->object;
2999 * mono_llvm_clear_exception:
3001 * Mark the currently thrown exception as handled.
3004 mono_llvm_clear_exception (void)
3006 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3007 mono_gchandle_free (jit_tls->thrown_exc);
3008 jit_tls->thrown_exc = 0;
3009 if (jit_tls->thrown_non_exc)
3010 mono_gchandle_free (jit_tls->thrown_non_exc);
3011 jit_tls->thrown_non_exc = 0;
3013 mono_memory_barrier ();
3017 * mono_llvm_match_exception:
3019 * Return the innermost clause containing REGION_START-REGION_END which can handle
3020 * the current exception.
3023 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
3026 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3030 g_assert (jit_tls->thrown_exc);
3031 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
3032 if (jit_tls->thrown_non_exc) {
3034 * Have to unwrap RuntimeWrappedExceptions if the
3035 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
3037 if (!wrap_non_exception_throws (jinfo_get_method (jinfo)))
3038 exc = mono_gchandle_get_target (jit_tls->thrown_non_exc);
3041 for (int i = 0; i < jinfo->num_clauses; i++) {
3042 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
3043 MonoClass *catch_class;
3045 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
3048 catch_class = ei->data.catch_class;
3049 if (mono_class_is_open_constructed_type (&catch_class->byval_arg)) {
3050 MonoGenericContext context;
3051 MonoType *inflated_type;
3053 g_assert (rgctx || this_obj);
3054 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
3055 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
3056 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
3058 catch_class = mono_class_from_mono_type (inflated_type);
3059 mono_metadata_free_type (inflated_type);
3062 // FIXME: Handle edge cases handled in get_exception_catch_class
3063 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (exc, catch_class, &error)) {
3064 index = ei->clause_index;
3067 mono_error_assert_ok (&error);
3069 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
3070 g_assert_not_reached ();
3079 mono_debug_personality (int a, _Unwind_Action b,
3080 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
3082 g_assert_not_reached ();
3086 mono_debug_personality (void);
3089 mono_debug_personality (void)
3091 g_assert_not_reached ();