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 Ximian, Inc.
17 #ifdef HAVE_EXECINFO_H
21 #ifdef HAVE_SYS_TYPES_H
22 #include <sys/types.h>
25 #ifdef HAVE_SYS_WAIT_H
33 #ifdef HAVE_SYS_SYSCALL_H
34 #include <sys/syscall.h>
37 #include <mono/metadata/appdomain.h>
38 #include <mono/metadata/tabledefs.h>
39 #include <mono/metadata/threads.h>
40 #include <mono/metadata/threads-types.h>
41 #include <mono/metadata/debug-helpers.h>
42 #include <mono/metadata/exception.h>
43 #include <mono/metadata/gc-internal.h>
44 #include <mono/metadata/mono-debug.h>
45 #include <mono/metadata/profiler.h>
46 #include <mono/utils/mono-mmap.h>
49 #include "debug-mini.h"
51 #include "debugger-agent.h"
53 #ifndef MONO_ARCH_CONTEXT_DEF
54 #define MONO_ARCH_CONTEXT_DEF
57 static gpointer restore_context_func, call_filter_func;
58 static gpointer throw_exception_func, rethrow_exception_func;
59 static gpointer throw_corlib_exception_func;
61 static gpointer try_more_restore_tramp = NULL;
62 static gpointer restore_stack_protection_tramp = NULL;
64 static void try_more_restore (void);
65 static void restore_stack_protection (void);
66 static void mono_walk_stack_full (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gboolean use_new_ctx, gpointer user_data);
69 mono_exceptions_init (void)
72 restore_context_func = mono_aot_get_trampoline ("restore_context");
73 call_filter_func = mono_aot_get_trampoline ("call_filter");
74 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
75 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
79 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
81 mono_save_trampoline_xdebug_info (info);
82 mono_tramp_info_free (info);
84 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
86 mono_save_trampoline_xdebug_info (info);
87 mono_tramp_info_free (info);
89 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
91 mono_save_trampoline_xdebug_info (info);
92 mono_tramp_info_free (info);
94 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
96 mono_save_trampoline_xdebug_info (info);
97 mono_tramp_info_free (info);
100 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
101 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
102 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
105 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
106 mono_arch_exceptions_init ();
111 mono_get_throw_exception (void)
113 g_assert (throw_exception_func);
114 return throw_exception_func;
118 mono_get_rethrow_exception (void)
120 g_assert (rethrow_exception_func);
121 return rethrow_exception_func;
125 mono_get_call_filter (void)
127 g_assert (call_filter_func);
128 return call_filter_func;
132 mono_get_restore_context (void)
134 g_assert (restore_context_func);
135 return restore_context_func;
139 mono_get_throw_corlib_exception (void)
141 gpointer code = NULL;
144 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
145 if (throw_corlib_exception_func)
146 return throw_corlib_exception_func;
149 code = mono_aot_get_trampoline ("throw_corlib_exception");
151 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
153 mono_save_trampoline_xdebug_info (info);
154 mono_tramp_info_free (info);
158 mono_memory_barrier ();
160 throw_corlib_exception_func = code;
162 return throw_corlib_exception_func;
166 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
168 MonoTryBlockHoleTableJitInfo *table;
173 /*FIXME check if under s390 it should be ei->try_start >= ip*/
174 if (ei->try_start > ip || ip >= ei->try_end)
177 if (!ji->has_try_block_holes)
180 table = mono_jit_info_get_try_block_hole_table_info (ji);
181 offset = (guint32)((char*)ip - (char*)ji->code_start);
182 clause = (guint16)(ei - ji->clauses);
183 g_assert (clause < ji->num_clauses);
185 for (i = 0; i < table->num_holes; ++i) {
186 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
187 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
193 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
196 * find_jit_info_no_ext:
198 * If the target has the find_jit_info_ext version of this function, define the old
199 * version here which translates between the old and new APIs.
202 find_jit_info_no_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
203 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
205 StackFrameInfo frame;
208 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
210 /* Avoid costly table lookup during stack overflow */
211 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
214 ji = mini_jit_info_table_find (domain, ip, NULL);
219 err = mono_arch_find_jit_info_ext (domain, jit_tls, ji, ctx, new_ctx, lmf, &frame);
223 /* Convert between the new and the old APIs */
224 switch (frame.type) {
225 case FRAME_TYPE_MANAGED:
229 case FRAME_TYPE_MANAGED_TO_NATIVE:
233 memset (res, 0, sizeof (MonoJitInfo));
234 res->method = frame.method;
237 case FRAME_TYPE_DEBUGGER_INVOKE: {
241 * The normal exception handling code can't handle this frame, so just
244 ji = find_jit_info_no_ext (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
245 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
249 g_assert_not_reached ();
256 /* mono_find_jit_info:
258 * This function is used to gather information from @ctx. It return the
259 * MonoJitInfo of the corresponding function, unwinds one stack frame and
260 * stores the resulting context into @new_ctx. It also stores a string
261 * describing the stack location into @trace (if not NULL), and modifies
262 * the @lmf if necessary. @native_offset return the IP offset from the
263 * start of the function or -1 if that info is not available.
266 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
267 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
271 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
283 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
284 ji = find_jit_info_no_ext (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
286 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
289 if (ji == (gpointer)-1)
292 if (managed2 || (ji && ji->method->wrapper_type)) {
293 const char *real_ip, *start;
296 start = (const char *)ji->code_start;
298 /* ctx->ip points into native code */
299 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
301 real_ip = (const char*)ip;
303 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
304 offset = real_ip - start;
309 *native_offset = offset;
312 if (!ji->method->wrapper_type)
316 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
319 char *fname = mono_method_full_name (res->method, TRUE);
320 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
328 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
331 * mono_find_jit_info_ext:
333 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
337 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
338 MonoJitInfo *prev_ji, MonoContext *ctx,
339 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
340 StackFrameInfo *frame)
343 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
345 MonoDomain *target_domain;
350 /* Avoid costly table lookup during stack overflow */
351 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
354 ji = mini_jit_info_table_find (domain, ip, &target_domain);
357 target_domain = domain;
359 err = mono_arch_find_jit_info_ext (target_domain, jit_tls, ji, ctx, new_ctx, lmf, frame);
363 frame->native_offset = -1;
364 frame->domain = target_domain;
368 if (ji && (frame->managed || ji->method->wrapper_type)) {
369 const char *real_ip, *start;
371 start = (const char *)ji->code_start;
373 /* ctx->ip points into native code */
374 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
376 real_ip = (const char*)ip;
378 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
379 frame->native_offset = real_ip - start;
381 frame->native_offset = -1;
384 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
386 if (trace && frame->method) {
387 char *fname = mono_method_full_name (frame->method, TRUE);
388 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
396 #endif /* MONO_ARCH_HAVE_FIND_JIT_INFO_EXT */
399 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
401 MonoGenericJitInfo *gi;
404 if (!ji->has_generic_jit_info)
406 gi = mono_jit_info_get_generic_jit_info (ji);
411 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
413 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
415 if (mono_method_get_context (ji->method)->method_inst) {
417 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
420 /* Avoid returning a managed object */
421 MonoObject *this_obj = info;
423 return this_obj->vtable->klass;
427 static MonoGenericContext
428 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
430 MonoGenericContext context = { NULL, NULL };
431 MonoClass *class, *method_container_class;
433 g_assert (generic_info);
435 g_assert (ji->method->is_inflated);
436 if (mono_method_get_context (ji->method)->method_inst) {
437 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
439 class = mrgctx->class_vtable->klass;
440 context.method_inst = mrgctx->method_inst;
441 g_assert (context.method_inst);
442 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
443 MonoVTable *vtable = generic_info;
445 class = vtable->klass;
447 class = generic_info;
450 //g_assert (!ji->method->klass->generic_container);
451 if (ji->method->klass->generic_class)
452 method_container_class = ji->method->klass->generic_class->container_class;
454 method_container_class = ji->method->klass;
456 /* class might refer to a subclass of ji->method's class */
457 while (class->generic_class && class->generic_class->container_class != method_container_class) {
458 class = class->parent;
462 if (class->generic_class || class->generic_container)
463 context.class_inst = mini_class_get_context (class)->class_inst;
465 if (class->generic_class)
466 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
468 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
474 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
476 MonoGenericContext context;
479 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
481 context = get_generic_context_from_stack_frame (ji, generic_info);
483 method = mono_method_get_declaring_generic_method (ji->method);
484 method = mono_class_inflate_generic_method (method, &context);
490 ves_icall_System_Exception_get_trace (MonoException *ex)
492 MonoDomain *domain = mono_domain_get ();
494 MonoArray *ta = ex->trace_ips;
499 /* Exception is not thrown yet */
502 len = mono_array_length (ta) >> 1;
503 trace_str = g_string_new ("");
504 for (i = 0; i < len; i++) {
506 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
507 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
509 ji = mono_jit_info_table_find (domain, ip);
511 /* Unmanaged frame */
512 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
516 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
518 address = (char *)ip - (char *)ji->code_start;
519 location = mono_debug_print_stack_frame (
520 method, address, ex->object.vtable->domain);
522 g_string_append_printf (trace_str, "%s\n", location);
527 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
528 g_string_free (trace_str, TRUE);
534 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
536 MonoDomain *domain = mono_domain_get ();
538 MonoArray *ta = exc->trace_ips;
539 MonoDebugSourceLocation *location;
543 /* Exception is not thrown yet */
544 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
547 len = mono_array_length (ta) >> 1;
549 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
551 for (i = skip; i < len; i++) {
553 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
554 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
555 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
558 ji = mono_jit_info_table_find (domain, ip);
560 /* Unmanaged frame */
561 mono_array_setref (res, i, sf);
565 g_assert (ji != NULL);
567 method = get_method_from_stack_frame (ji, generic_info);
568 if (ji->method->wrapper_type) {
572 s = mono_method_full_name (method, TRUE);
573 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
577 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
578 sf->native_offset = (char *)ip - (char *)ji->code_start;
581 * mono_debug_lookup_source_location() returns both the file / line number information
582 * and the IL offset. Note that computing the IL offset is already an expensive
583 * operation, so we shouldn't call this method twice.
585 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
587 sf->il_offset = location->il_offset;
591 if (need_file_info) {
592 if (location && location->source_file) {
593 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
594 sf->line = location->row;
595 sf->column = location->column;
597 sf->line = sf->column = 0;
602 mono_debug_free_source_location (location);
603 mono_array_setref (res, i, sf);
611 * @domain: starting appdomain
612 * @jit_tls: JIT data for the thread
613 * @start_ctx: starting state of the stack frame
614 * @func: callback to call for each stack frame
615 * @user_data: data passed to the callback
617 * This function walks the stack of a thread, starting from the state
618 * represented by jit_tls and start_ctx. For each frame the callback
619 * function is called with the relevant info. The walk ends when no more
620 * managed stack frames are found or when the callback returns a TRUE value.
621 * Note that the function can be used to walk the stack of a thread
622 * different from the current.
625 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
627 mono_walk_stack_full (domain, jit_tls, start_ctx, func, TRUE, user_data);
631 mono_walk_stack_full (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gboolean use_new_ctx, gpointer user_data)
633 MonoLMF *lmf = mono_get_lmf ();
634 MonoJitInfo *ji, rji;
637 MonoContext ctx, new_ctx;
641 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
643 * FIXME: mono_find_jit_info () will need to be able to return a different
644 * MonoDomain when apddomain transitions are found on the stack.
646 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
647 if (!ji || ji == (gpointer)-1)
650 if (func (domain, use_new_ctx ? &new_ctx : &ctx, ji, user_data))
658 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
660 MonoDomain *domain = mono_domain_get ();
661 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
662 MonoLMF *lmf = mono_get_lmf ();
663 MonoJitInfo *ji, rji;
664 gint native_offset, il_offset;
666 MonoContext ctx, new_ctx;
668 MONO_ARCH_CONTEXT_DEF
670 mono_arch_flush_register_windows ();
673 memcpy (&ctx, start_ctx, sizeof (MonoContext));
675 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
676 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
678 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
682 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
683 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
686 if (ji == (gpointer)-1)
690 MonoDebugSourceLocation *source;
692 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
693 il_offset = source ? source->il_offset : -1;
694 mono_debug_free_source_location (source);
698 if (func (ji->method, native_offset, il_offset, managed, user_data))
706 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
708 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
712 mono_jit_walk_stack_from_ctx_in_thread (MonoJitStackWalk func, MonoDomain *domain, MonoContext *start_ctx, gboolean do_il_offset, MonoInternalThread *thread, MonoLMF *lmf, gpointer user_data)
714 MonoJitTlsData *jit_tls = thread->jit_data;
716 MonoContext ctx, new_ctx;
717 StackFrameInfo frame;
718 #ifndef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
721 MonoJitInfo *ji, rji;
726 MONO_ARCH_CONTEXT_DEF
728 mono_arch_flush_register_windows ();
731 memcpy (&ctx, start_ctx, sizeof (MonoContext));
733 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
734 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
736 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
738 g_assert (thread == mono_thread_internal_current ());
741 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
743 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
744 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, &frame);
748 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
750 frame.type = FRAME_TYPE_MANAGED;
752 frame.managed = managed;
753 frame.native_offset = native_offset;
755 if (ji == (gpointer)-1)
759 if (do_il_offset && frame.ji) {
760 MonoDebugSourceLocation *source;
762 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
763 il_offset = source ? source->il_offset : -1;
764 mono_debug_free_source_location (source);
768 frame.il_offset = il_offset;
770 if (func (&frame, &ctx, user_data))
779 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
780 MonoReflectionMethod **method,
781 gint32 *iloffset, gint32 *native_offset,
782 MonoString **file, gint32 *line, gint32 *column)
784 MonoDomain *domain = mono_domain_get ();
785 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
786 MonoLMF *lmf = mono_get_lmf ();
787 MonoJitInfo *ji, rji;
788 MonoContext ctx, new_ctx, ji_ctx;
789 MonoDebugSourceLocation *location;
790 MonoMethod *last_method = NULL, *actual_method;
792 MONO_ARCH_CONTEXT_DEF;
794 mono_arch_flush_register_windows ();
796 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
797 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
799 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
804 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
807 if (ji && ji != (gpointer)-1 &&
808 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
809 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
813 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
816 /* skip all wrappers ??*/
817 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
818 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
819 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
820 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
821 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
822 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
825 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
827 * FIXME: Native-to-managed wrappers sometimes show up twice.
828 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
834 last_method = ji->method;
840 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
842 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
844 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
846 *iloffset = location->il_offset;
850 if (need_file_info) {
852 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
853 *line = location->row;
854 *column = location->column;
861 mono_debug_free_source_location (location);
868 MonoSecurityFrame *frame;
869 } MonoFrameSecurityInfo;
872 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
874 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
876 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
877 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
878 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
879 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
880 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
881 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
890 si->frame = mono_declsec_create_frame (domain, ji);
892 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
897 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
898 * @skip: the number of stack frames to skip
900 * This function returns a the security informations of a single stack frame
901 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
902 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
906 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
908 MonoDomain *domain = mono_domain_get ();
909 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
910 MonoFrameSecurityInfo si;
913 MONO_ARCH_CONTEXT_DEF
915 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
916 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
918 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
921 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
927 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
929 return (si.skips == 0) ? si.frame : NULL;
941 grow_array (MonoSecurityStack *stack)
943 MonoDomain *domain = mono_domain_get ();
944 guint32 newsize = (stack->maximum << 1);
945 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
947 for (i=0; i < stack->maximum; i++) {
948 gpointer frame = mono_array_get (stack->stack, gpointer, i);
949 mono_array_setref (newstack, i, frame);
951 stack->maximum = newsize;
952 stack->stack = newstack;
956 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
958 MonoSecurityStack *ss = (MonoSecurityStack*) data;
960 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
961 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
962 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
963 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
964 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
965 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
974 if (ss->count == ss->maximum)
977 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
979 /* continue down the stack */
984 glist_to_array (GList *list, MonoClass *eclass)
986 MonoDomain *domain = mono_domain_get ();
993 len = g_list_length (list);
994 res = mono_array_new (domain, eclass, len);
996 for (i = 0; list; list = list->next, i++)
997 mono_array_set (res, gpointer, i, list->data);
1003 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1004 * @skip: the number of stack frames to skip
1006 * This function returns an managed array of containing the security
1007 * informations for each frame (after the skipped ones). This is used for
1008 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1012 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1014 MonoDomain *domain = mono_domain_get ();
1015 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1016 MonoSecurityStack ss;
1019 MONO_ARCH_CONTEXT_DEF
1021 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1022 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1024 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
1027 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1033 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1034 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
1035 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
1036 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1041 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1043 MonoClass *catch_class = ei->data.catch_class;
1044 MonoType *inflated_type;
1045 MonoGenericContext context;
1047 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1048 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1051 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1053 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1055 /* FIXME: we shouldn't inflate but instead put the
1056 type in the rgctx and fetch it from there. It
1057 might be a good idea to do this lazily, i.e. only
1058 when the exception is actually thrown, so as not to
1059 waste space for exception clauses which might never
1061 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1062 catch_class = mono_class_from_mono_type (inflated_type);
1063 mono_metadata_free_type (inflated_type);
1069 * mini_jit_info_table_find:
1071 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1072 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1073 * OUT_DOMAIN if it is not NULL.
1076 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1079 MonoInternalThread *t = mono_thread_internal_current ();
1085 ji = mono_jit_info_table_find (domain, addr);
1088 *out_domain = domain;
1092 /* maybe it is shared code, so we also search in the root domain */
1093 if (domain != mono_get_root_domain ()) {
1094 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1097 *out_domain = mono_get_root_domain ();
1102 for (l = t->appdomain_refs; l; l = l->next) {
1103 if (l->data != domain) {
1104 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1107 *out_domain = (MonoDomain*)l->data;
1117 * mono_handle_exception_internal:
1118 * @ctx: saved processor state
1119 * @obj: the exception object
1120 * @test_only: only test if the exception is caught, but dont call handlers
1121 * @out_filter_idx: out parameter. if test_only is true, set to the index of
1122 * the first filter clause which caught the exception.
1123 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1126 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gboolean resume, gint32 *out_filter_idx, MonoJitInfo **out_ji)
1128 MonoDomain *domain = mono_domain_get ();
1129 MonoJitInfo *ji, rji;
1130 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1131 static void (*restore_context) (void *);
1132 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1133 MonoLMF *lmf = mono_get_lmf ();
1134 MonoArray *initial_trace_ips = NULL;
1135 GList *trace_ips = NULL;
1136 MonoException *mono_ex;
1137 gboolean stack_overflow = FALSE;
1138 MonoContext initial_ctx;
1139 int frame_count = 0;
1140 gboolean has_dynamic_methods = FALSE;
1141 gint32 filter_idx, first_filter_idx;
1144 g_assert (ctx != NULL);
1146 MonoException *ex = mono_get_exception_null_reference ();
1147 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1148 obj = (MonoObject *)ex;
1152 * Allocate a new exception object instead of the preconstructed ones.
1154 if (obj == domain->stack_overflow_ex) {
1156 * It is not a good idea to try and put even more pressure on the little stack available.
1157 * obj = mono_get_exception_stack_overflow ();
1159 stack_overflow = TRUE;
1161 else if (obj == domain->null_reference_ex) {
1162 obj = mono_get_exception_null_reference ();
1166 // FIXME: This breaks some tests
1167 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1168 obj = mono_get_exception_runtime_wrapped (obj);
1170 * FIXME: Might have to unwrap this before passing it to a catch clause based on the
1171 * RuntimeCompatibilityAttribute.
1175 mono_ex = (MonoException*)obj;
1176 initial_trace_ips = mono_ex->trace_ips;
1179 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1180 mono_ex = (MonoException*)obj;
1181 initial_trace_ips = mono_ex->trace_ips;
1186 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1187 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1188 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1189 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1190 mono_ex->message = mono_string_new (domain, msg);
1197 call_filter = mono_get_call_filter ();
1199 if (!restore_context)
1200 restore_context = mono_get_restore_context ();
1202 g_assert (jit_tls->end_of_stack);
1203 g_assert (jit_tls->abort_func);
1205 if (!test_only && !resume) {
1206 MonoContext ctx_cp = *ctx;
1207 if (mono_trace_is_enabled ()) {
1208 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1209 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1210 MonoObject *message;
1211 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1213 MonoObject *exc = NULL;
1214 if (get_message == NULL) {
1216 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1218 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1220 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1224 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1226 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1228 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1229 mono_print_thread_dump_from_ctx (ctx);
1231 mono_profiler_exception_thrown (obj);
1232 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, FALSE, &first_filter_idx, out_ji)) {
1233 if (mono_break_on_exc)
1235 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1236 // FIXME: This runs managed code so it might cause another stack overflow when
1237 // we are handling a stack overflow
1238 mono_unhandled_exception (obj);
1240 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1245 *out_filter_idx = -1;
1250 memset (&rji, 0, sizeof (rji));
1253 MonoContext new_ctx;
1255 int clause_index_start = 0;
1259 ji = jit_tls->resume_state.ji;
1260 new_ctx = jit_tls->resume_state.new_ctx;
1261 clause_index_start = jit_tls->resume_state.clause_index;
1262 lmf = jit_tls->resume_state.lmf;
1263 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1264 filter_idx = jit_tls->resume_state.filter_idx;
1266 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1267 NULL, &lmf, NULL, NULL);
1269 g_warning ("Exception inside function without unwind info");
1270 g_assert_not_reached ();
1274 if (ji != (gpointer)-1 && !(ji->code_start <= MONO_CONTEXT_GET_IP (ctx) && (((guint8*)ji->code_start + ji->code_size >= (guint8*)MONO_CONTEXT_GET_IP (ctx))))) {
1276 * The exception was raised in native code and we got back to managed code
1283 if (ji != (gpointer)-1) {
1285 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
1287 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1288 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1289 "The native frame called the managed method:\n%s\n",
1290 mono_method_full_name (ji->method, TRUE));
1293 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1295 * Avoid overwriting the stack trace if the exception is
1296 * rethrown. Also avoid giant stack traces during a stack
1299 if (!initial_trace_ips && (frame_count < 1000)) {
1300 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1301 trace_ips = g_list_prepend (trace_ips,
1302 get_generic_info_from_stack_frame (ji, ctx));
1306 if (ji->method->dynamic)
1307 has_dynamic_methods = TRUE;
1310 #ifndef MONO_ARCH_STACK_GROWS_UP
1311 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1313 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1316 free_stack = 0xffffff;
1319 * During stack overflow, wait till the unwinding frees some stack
1320 * space before running handlers/finalizers.
1322 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1325 for (i = clause_index_start; i < ji->num_clauses; i++) {
1326 MonoJitExceptionInfo *ei = &ji->clauses [i];
1327 gboolean filtered = FALSE;
1329 #if defined(__s390__)
1331 * This is required in cases where a try block starts immediately after
1332 * a call which causes an exception. Testcase: tests/exception8.cs.
1333 * FIXME: Clean this up.
1335 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) && MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1337 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1340 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1342 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1343 if (ji->from_llvm) {
1344 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1345 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, obj);
1347 g_assert_not_reached ();
1350 /* store the exception object in bp + ei->exvar_offset */
1351 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1355 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1357 mono_perfcounters->exceptions_filters++;
1358 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1359 filtered = call_filter (ctx, ei->data.filter);
1360 if (filtered && out_filter_idx)
1361 *out_filter_idx = filter_idx;
1367 * Filter clauses should only be run in the
1368 * first pass of exception handling.
1370 filtered = (filter_idx == first_filter_idx);
1375 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1376 mono_object_isinst (obj, catch_class)) || filtered) {
1378 if (mono_ex && !initial_trace_ips) {
1379 trace_ips = g_list_reverse (trace_ips);
1380 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1381 if (has_dynamic_methods)
1382 /* These methods could go away anytime, so compute the stack trace now */
1383 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1385 g_list_free (trace_ips);
1390 * This guards against the situation that we abort a thread that is executing a finally clause
1391 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1392 * check for this situation here and resume interruption if we are below the guarded block.
1394 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1395 gboolean is_outside = FALSE;
1396 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->ex_ctx);
1397 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1398 //FIXME make this stack direction aware
1399 if (catch_bp > prot_bp) {
1401 } else if (catch_bp == prot_bp) {
1402 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1403 * So we check if the catch handler_start is protected by the guarded handler protected region
1406 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1407 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1408 * There aren't any further finally/fault handler blocks down the stack over this exception.
1409 * This must be ensured by the code that installs the guard trampoline.
1411 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->ex_ctx), NULL));
1413 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1418 jit_tls->handler_block_return_address = NULL;
1419 jit_tls->handler_block = NULL;
1420 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1424 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1425 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1426 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1427 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1428 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1429 *(mono_get_lmf_addr ()) = lmf;
1430 mono_perfcounters->exceptions_depth += frame_count;
1431 if (obj == domain->stack_overflow_ex)
1432 jit_tls->handling_stack_ovf = FALSE;
1436 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1437 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1438 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1439 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1440 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1441 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1442 call_filter (ctx, ei->handler_start);
1444 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1445 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1446 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1447 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1448 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1449 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1450 mono_perfcounters->exceptions_finallys++;
1451 *(mono_get_lmf_addr ()) = lmf;
1452 if (ji->from_llvm) {
1454 * LLVM compiled finally handlers follow the design
1455 * of the c++ ehabi, i.e. they call a resume function
1456 * at the end instead of returning to the caller.
1457 * So save the exception handling state,
1458 * mono_resume_unwind () will call us again to continue
1461 jit_tls->resume_state.ex_obj = obj;
1462 jit_tls->resume_state.ji = ji;
1463 jit_tls->resume_state.clause_index = i + 1;
1464 jit_tls->resume_state.ctx = *ctx;
1465 jit_tls->resume_state.new_ctx = new_ctx;
1466 jit_tls->resume_state.lmf = lmf;
1467 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1468 jit_tls->resume_state.filter_idx = filter_idx;
1469 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1472 call_filter (ctx, ei->handler_start);
1480 mono_profiler_exception_method_leave (ji->method);
1485 if (ji == (gpointer)-1) {
1488 *(mono_get_lmf_addr ()) = lmf;
1490 jit_tls->abort_func (obj);
1491 g_assert_not_reached ();
1493 if (mono_ex && !initial_trace_ips) {
1494 trace_ips = g_list_reverse (trace_ips);
1495 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1496 if (has_dynamic_methods)
1497 /* These methods could go away anytime, so compute the stack trace now */
1498 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1500 g_list_free (trace_ips);
1506 g_assert_not_reached ();
1510 * mono_debugger_handle_exception:
1512 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1513 * at the exception and FALSE to resume with the normal exception handling.
1515 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1516 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1517 * `callq throw' instruction.
1520 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1522 MonoDebuggerExceptionAction action;
1524 if (!mono_debug_using_mono_debugger ())
1528 MonoException *ex = mono_get_exception_null_reference ();
1529 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1530 obj = (MonoObject *)ex;
1533 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1535 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1537 * The debugger wants us to stop on the `throw' instruction.
1538 * By the time we get here, it already inserted a breakpoint there.
1541 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1542 MonoContext ctx_cp = *ctx;
1543 MonoJitInfo *ji = NULL;
1547 * The debugger wants us to stop only if this exception is user-unhandled.
1550 ret = mono_handle_exception_internal (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), TRUE, FALSE, NULL, &ji);
1551 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1553 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1554 * inside the method being invoked, so we handle it like a user-unhandled exception.
1561 * The exception is user-unhandled - tell the debugger to stop.
1563 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1567 * The exception is catched somewhere - resume with the normal exception handling and don't
1568 * stop in the debugger.
1576 * mono_debugger_run_finally:
1577 * @start_ctx: saved processor state
1579 * This method is called by the Mono Debugger to call all `finally' clauses of the
1580 * current stack frame. It's used when the user issues a `return' command to make
1581 * the current stack frame return. After returning from this method, the debugger
1582 * unwinds the stack one frame and gives control back to the user.
1584 * NOTE: This method is only used when running inside the Mono Debugger.
1587 mono_debugger_run_finally (MonoContext *start_ctx)
1589 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1590 MonoDomain *domain = mono_domain_get ();
1591 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1592 MonoLMF *lmf = mono_get_lmf ();
1593 MonoContext ctx, new_ctx;
1594 MonoJitInfo *ji, rji;
1599 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1600 if (!ji || ji == (gpointer)-1)
1604 call_filter = mono_get_call_filter ();
1606 for (i = 0; i < ji->num_clauses; i++) {
1607 MonoJitExceptionInfo *ei = &ji->clauses [i];
1609 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1610 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1611 call_filter (&ctx, ei->handler_start);
1617 * mono_handle_exception:
1618 * @ctx: saved processor state
1619 * @obj: the exception object
1620 * @test_only: only test if the exception is caught, but dont call handlers
1623 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1626 mono_perfcounters->exceptions_thrown++;
1628 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, FALSE, NULL, NULL);
1631 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1633 #ifndef MONO_ARCH_USE_SIGACTION
1634 #error "Can't use sigaltstack without sigaction"
1637 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1640 mono_setup_altstack (MonoJitTlsData *tls)
1643 struct sigaltstack sa;
1644 guint8 *staddr = NULL;
1646 if (mono_running_on_valgrind ())
1649 mono_thread_get_stack_bounds (&staddr, &stsize);
1653 tls->end_of_stack = staddr + stsize;
1655 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1657 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1658 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1660 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1662 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1663 /* mprotect can fail for the main thread stack */
1664 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);
1665 g_assert (gaddr == tls->stack_ovf_guard_base);
1666 tls->stack_ovf_valloced = TRUE;
1670 * threads created by nptl does not seem to have a guard page, and
1671 * since the main thread is not created by us, we can't even set one.
1672 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1673 * is a stack overflow exception.
1675 tls->stack_size = stsize + mono_pagesize ();
1677 /* Setup an alternate signal stack */
1678 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1679 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1681 g_assert (tls->signal_stack);
1683 sa.ss_sp = tls->signal_stack;
1684 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1685 sa.ss_flags = SS_ONSTACK;
1686 sigaltstack (&sa, NULL);
1690 mono_free_altstack (MonoJitTlsData *tls)
1692 struct sigaltstack sa;
1695 sa.ss_sp = tls->signal_stack;
1696 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1697 sa.ss_flags = SS_DISABLE;
1698 err = sigaltstack (&sa, NULL);
1699 g_assert (err == 0);
1701 if (tls->signal_stack)
1702 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1703 if (tls->stack_ovf_valloced)
1704 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1706 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1709 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1712 mono_setup_altstack (MonoJitTlsData *tls)
1717 mono_free_altstack (MonoJitTlsData *tls)
1721 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1724 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1726 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1727 /* we need to leave some room for throwing the exception */
1728 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1729 unprotect_size -= mono_pagesize ();
1730 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1731 * is sufficient stack
1733 //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);
1735 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1736 return unprotect_size == jit_tls->stack_ovf_guard_size;
1740 try_more_restore (void)
1742 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1743 if (try_restore_stack_protection (jit_tls, 500))
1744 jit_tls->restore_stack_prot = NULL;
1748 restore_stack_protection (void)
1750 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1751 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1752 /* if we can't restore the stack protection, keep a callback installed so
1753 * we'll try to restore as much stack as we can at each return from unmanaged
1756 if (try_restore_stack_protection (jit_tls, 4096))
1757 jit_tls->restore_stack_prot = NULL;
1759 jit_tls->restore_stack_prot = try_more_restore_tramp;
1760 /* here we also throw a stack overflow exception */
1761 ex->trace_ips = NULL;
1762 ex->stack_trace = NULL;
1763 mono_raise_exception (ex);
1767 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1769 void (*func)(void) = (gpointer)tramp_data;
1775 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1777 /* we got a stack overflow in the soft-guard pages
1778 * There are two cases:
1779 * 1) managed code caused the overflow: we unprotect the soft-guard page
1780 * and let the arch-specific code trigger the exception handling mechanism
1781 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1782 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1783 * and hope we can continue with those enabled, at least until the hard-guard page
1784 * is hit. The alternative to continuing here is to just print a message and abort.
1785 * We may add in the future the code to protect the pages again in the codepath
1786 * when we return from unmanaged to managed code.
1788 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1789 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1790 /* we unprotect the minimum amount we can */
1792 gboolean handled = FALSE;
1794 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1795 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1796 guard_size -= mono_pagesize ();
1798 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1799 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1800 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);
1801 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1803 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1808 /* We print a message: after this even managed stack overflows
1809 * may crash the runtime
1811 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1812 if (!jit_tls->handling_stack_ovf) {
1813 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1814 jit_tls->handling_stack_ovf = 1;
1816 /*fprintf (stderr, "Already handling stack overflow\n");*/
1825 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1827 FILE *stream = (FILE*)data;
1830 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1831 fprintf (stream, " %s\n", location);
1834 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1839 static G_GNUC_UNUSED gboolean
1840 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1843 GString *p = (GString*)data;
1846 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1847 g_string_append_printf (p, " %s\n", location);
1850 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1855 static gboolean handling_sigsegv = FALSE;
1858 * mono_handle_native_sigsegv:
1860 * Handle a SIGSEGV received while in native code by printing diagnostic
1861 * information and aborting.
1864 mono_handle_native_sigsegv (int signal, void *ctx)
1866 #ifdef MONO_ARCH_USE_SIGACTION
1867 struct sigaction sa;
1869 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1871 if (handling_sigsegv)
1874 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1875 fprintf (stderr, "Received SIGSEGV, suspending...");
1880 /* To prevent infinite loops when the stack walk causes a crash */
1881 handling_sigsegv = TRUE;
1883 /* !jit_tls means the thread was not registered with the runtime */
1884 if (jit_tls && mono_thread_internal_current ()) {
1885 fprintf (stderr, "Stacktrace:\n\n");
1887 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1892 #ifdef HAVE_BACKTRACE_SYMBOLS
1897 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1899 fprintf (stderr, "\nNative stacktrace:\n\n");
1901 size = backtrace (array, 256);
1902 names = backtrace_symbols (array, size);
1903 for (i =0; i < size; ++i) {
1904 fprintf (stderr, "\t%s\n", names [i]);
1910 /* Try to get more meaningful information using gdb */
1912 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1913 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1914 /* From g_spawn_command_line_sync () in eglib */
1916 int stdout_pipe [2] = { -1, -1 };
1921 res = pipe (stdout_pipe);
1922 g_assert (res != -1);
1926 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1927 * it will deadlock. Call the syscall directly instead.
1929 pid = mono_runtime_syscall_fork ();
1932 close (stdout_pipe [0]);
1933 dup2 (stdout_pipe [1], STDOUT_FILENO);
1935 for (i = getdtablesize () - 1; i >= 3; i--)
1938 if (!mono_gdb_render_native_backtraces ())
1939 close (STDOUT_FILENO);
1944 close (stdout_pipe [1]);
1946 fprintf (stderr, "\nDebug info from gdb:\n\n");
1949 int nread = read (stdout_pipe [0], buffer, 1024);
1953 write (STDERR_FILENO, buffer, nread);
1956 waitpid (pid, &status, WNOHANG);
1960 * A SIGSEGV indicates something went very wrong so we can no longer depend
1961 * on anything working. So try to print out lots of diagnostics, starting
1962 * with ones which have a greater chance of working.
1966 "=================================================================\n"
1967 "Got a %s while executing native code. This usually indicates\n"
1968 "a fatal error in the mono runtime or one of the native libraries \n"
1969 "used by your application.\n"
1970 "=================================================================\n"
1976 #ifdef MONO_ARCH_USE_SIGACTION
1978 /* Remove our SIGABRT handler */
1979 sa.sa_handler = SIG_DFL;
1980 sigemptyset (&sa.sa_mask);
1983 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1991 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
1993 MonoInternalThread *thread = mono_thread_internal_current ();
1994 #if defined(__i386__) || defined(__x86_64__)
1997 GString* text = g_string_new (0);
1998 char *name, *wapi_desc;
1999 GError *error = NULL;
2002 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2004 g_string_append_printf (text, "\n\"%s\"", name);
2007 else if (thread->threadpool_thread)
2008 g_string_append (text, "\n\"<threadpool thread>\"");
2010 g_string_append (text, "\n\"<unnamed thread>\"");
2013 wapi_desc = wapi_current_thread_desc ();
2014 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2018 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2020 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2022 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2024 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2026 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
2028 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2031 fprintf (stdout, "%s", text->str);
2032 g_string_free (text, TRUE);
2037 * mono_print_thread_dump:
2039 * Print information about the current thread to stdout.
2040 * SIGCTX can be NULL, allowing this to be called from gdb.
2043 mono_print_thread_dump (void *sigctx)
2045 mono_print_thread_dump_internal (sigctx, NULL);
2049 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2051 mono_print_thread_dump_internal (NULL, ctx);
2055 * mono_resume_unwind:
2057 * This is called by a trampoline from LLVM compiled finally clauses to continue
2061 mono_resume_unwind (MonoContext *ctx)
2063 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2064 static void (*restore_context) (MonoContext *);
2065 MonoContext new_ctx;
2067 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2068 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2071 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, NULL, FALSE, TRUE, NULL, NULL);
2073 if (!restore_context)
2074 restore_context = mono_get_restore_context ();
2076 restore_context (&new_ctx);
2079 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2084 MonoJitExceptionInfo *ei;
2085 } FindHandlerBlockData;
2088 find_last_handler_block (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
2092 FindHandlerBlockData *pdata = data;
2094 if (ji->method->wrapper_type)
2097 ip = MONO_CONTEXT_GET_IP (ctx);
2099 for (i = 0; i < ji->num_clauses; ++i) {
2100 MonoJitExceptionInfo *ei = ji->clauses + i;
2101 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2103 /*If ip points to the first instruction it means the handler block didn't start
2104 so we can leave its execution to the EH machinery*/
2105 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2117 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2120 MonoJitExceptionInfo *clause = NULL;
2123 ip = MONO_CONTEXT_GET_IP (ctx);
2125 for (i = 0; i < ji->num_clauses; ++i) {
2126 clause = &ji->clauses [i];
2127 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2129 if (clause->handler_start < ip && clause->data.handler_end > ip)
2133 /*no matching finally */
2134 if (i == ji->num_clauses)
2137 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2138 if (ip == clause->handler_start)
2141 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2145 * Finds the bottom handler block running and install a block guard if needed.
2148 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)
2150 FindHandlerBlockData data = { 0 };
2151 MonoDomain *domain = mono_domain_get ();
2152 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2155 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2156 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2158 if (!jit_tls || jit_tls->handler_block_return_address)
2161 mono_walk_stack_full (domain, jit_tls, ctx, find_last_handler_block, FALSE, &data);
2166 memcpy (&jit_tls->ex_ctx, &data.ctx, sizeof (MonoContext));
2168 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2169 if (resume_ip == NULL)
2172 jit_tls->handler_block_return_address = resume_ip;
2173 jit_tls->handler_block = data.ei;
2176 /*Clear current thread from been wapi interrupted otherwise things can go south*/
2177 wapi_clear_interruption ();
2184 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)