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_exception_by_name_func, 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)
71 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
76 restore_context_func = mono_aot_get_named_code ("restore_context");
77 call_filter_func = mono_aot_get_named_code ("call_filter");
78 throw_exception_func = mono_aot_get_named_code ("throw_exception");
79 rethrow_exception_func = mono_aot_get_named_code ("rethrow_exception");
81 restore_context_func = mono_arch_get_restore_context_full (&code_size, &ji, FALSE);
82 call_filter_func = mono_arch_get_call_filter_full (&code_size, &ji, FALSE);
83 throw_exception_func = mono_arch_get_throw_exception_full (&code_size, &ji, FALSE);
84 rethrow_exception_func = mono_arch_get_rethrow_exception_full (&code_size, &ji, FALSE);
87 restore_context_func = mono_arch_get_restore_context ();
88 call_filter_func = mono_arch_get_call_filter ();
89 throw_exception_func = mono_arch_get_throw_exception ();
90 rethrow_exception_func = mono_arch_get_rethrow_exception ();
92 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
93 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
94 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
97 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
98 mono_arch_exceptions_init ();
103 mono_get_throw_exception (void)
105 g_assert (throw_exception_func);
106 return throw_exception_func;
110 mono_get_rethrow_exception (void)
112 g_assert (rethrow_exception_func);
113 return rethrow_exception_func;
117 mono_get_call_filter (void)
119 g_assert (call_filter_func);
120 return call_filter_func;
124 mono_get_restore_context (void)
126 g_assert (restore_context_func);
127 return restore_context_func;
131 mono_get_throw_exception_by_name (void)
133 #ifdef MONO_ARCH_HAVE_THROW_EXCEPTION_BY_NAME
135 gpointer code = NULL;
136 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
141 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
142 if (throw_exception_by_name_func)
143 return throw_exception_by_name_func;
145 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
147 code = mono_aot_get_named_code ("throw_exception_by_name");
149 code = mono_arch_get_throw_exception_by_name_full (&code_size, &ji, FALSE);
151 code = mono_arch_get_throw_exception_by_name ();
154 mono_memory_barrier ();
156 throw_exception_by_name_func = code;
160 throw_exception_by_name_func = NULL;
162 g_assert_not_reached ();
165 return throw_exception_by_name_func;
169 mono_get_throw_corlib_exception (void)
171 gpointer code = NULL;
172 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
177 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
178 if (throw_corlib_exception_func)
179 return throw_corlib_exception_func;
181 #if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
182 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
184 code = mono_aot_get_named_code ("throw_corlib_exception");
186 code = mono_arch_get_throw_corlib_exception_full (&code_size, &ji, FALSE);
188 code = mono_arch_get_throw_corlib_exception ();
191 g_assert_not_reached ();
194 mono_memory_barrier ();
196 throw_corlib_exception_func = code;
198 return throw_corlib_exception_func;
202 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
204 MonoTryBlockHoleTableJitInfo *table;
209 /*FIXME check if under s390 it should be ei->try_start >= ip*/
210 if (ei->try_start > ip || ip >= ei->try_end)
213 if (!ji->has_try_block_holes)
216 table = mono_jit_info_get_try_block_hole_table_info (ji);
217 offset = (guint32)((char*)ip - (char*)ji->code_start);
218 clause = (guint16)(ei - ji->clauses);
219 g_assert (clause < ji->num_clauses);
221 for (i = 0; i < table->num_holes; ++i) {
222 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
223 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
229 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
232 * find_jit_info_no_ext:
234 * If the target has the find_jit_info_ext version of this function, define the old
235 * version here which translates between the old and new APIs.
238 find_jit_info_no_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
239 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
241 StackFrameInfo frame;
244 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
246 /* Avoid costly table lookup during stack overflow */
247 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
250 ji = mini_jit_info_table_find (domain, ip, NULL);
255 err = mono_arch_find_jit_info_ext (domain, jit_tls, ji, ctx, new_ctx, lmf, &frame);
259 /* Convert between the new and the old APIs */
260 switch (frame.type) {
261 case FRAME_TYPE_MANAGED:
265 case FRAME_TYPE_MANAGED_TO_NATIVE:
269 memset (res, 0, sizeof (MonoJitInfo));
270 res->method = frame.method;
273 case FRAME_TYPE_DEBUGGER_INVOKE: {
277 * The normal exception handling code can't handle this frame, so just
280 ji = find_jit_info_no_ext (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
281 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
285 g_assert_not_reached ();
292 /* mono_find_jit_info:
294 * This function is used to gather information from @ctx. It return the
295 * MonoJitInfo of the corresponding function, unwinds one stack frame and
296 * stores the resulting context into @new_ctx. It also stores a string
297 * describing the stack location into @trace (if not NULL), and modifies
298 * the @lmf if necessary. @native_offset return the IP offset from the
299 * start of the function or -1 if that info is not available.
302 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
303 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
307 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
319 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
320 ji = find_jit_info_no_ext (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
322 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
325 if (ji == (gpointer)-1)
328 if (managed2 || (ji && ji->method->wrapper_type)) {
329 const char *real_ip, *start;
332 start = (const char *)ji->code_start;
334 /* ctx->ip points into native code */
335 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
337 real_ip = (const char*)ip;
339 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
340 offset = real_ip - start;
345 *native_offset = offset;
348 if (!ji->method->wrapper_type)
352 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
355 char *fname = mono_method_full_name (res->method, TRUE);
356 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
364 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
367 * mono_find_jit_info_ext:
369 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
373 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
374 MonoJitInfo *prev_ji, MonoContext *ctx,
375 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
376 StackFrameInfo *frame)
379 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
381 MonoDomain *target_domain;
386 /* Avoid costly table lookup during stack overflow */
387 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
390 ji = mini_jit_info_table_find (domain, ip, &target_domain);
393 target_domain = domain;
395 err = mono_arch_find_jit_info_ext (target_domain, jit_tls, ji, ctx, new_ctx, lmf, frame);
399 frame->native_offset = -1;
400 frame->domain = target_domain;
404 if (ji && (frame->managed || ji->method->wrapper_type)) {
405 const char *real_ip, *start;
407 start = (const char *)ji->code_start;
409 /* ctx->ip points into native code */
410 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
412 real_ip = (const char*)ip;
414 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
415 frame->native_offset = real_ip - start;
417 frame->native_offset = -1;
420 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
422 if (trace && frame->method) {
423 char *fname = mono_method_full_name (frame->method, TRUE);
424 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
432 #endif /* MONO_ARCH_HAVE_FIND_JIT_INFO_EXT */
435 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
437 MonoGenericJitInfo *gi;
440 if (!ji->has_generic_jit_info)
442 gi = mono_jit_info_get_generic_jit_info (ji);
447 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
449 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
451 if (mono_method_get_context (ji->method)->method_inst) {
453 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
456 /* Avoid returning a managed object */
457 MonoObject *this_obj = info;
459 return this_obj->vtable->klass;
463 static MonoGenericContext
464 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
466 MonoGenericContext context = { NULL, NULL };
467 MonoClass *class, *method_container_class;
469 g_assert (generic_info);
471 g_assert (ji->method->is_inflated);
472 if (mono_method_get_context (ji->method)->method_inst) {
473 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
475 class = mrgctx->class_vtable->klass;
476 context.method_inst = mrgctx->method_inst;
477 g_assert (context.method_inst);
478 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
479 MonoVTable *vtable = generic_info;
481 class = vtable->klass;
483 class = generic_info;
486 //g_assert (!ji->method->klass->generic_container);
487 if (ji->method->klass->generic_class)
488 method_container_class = ji->method->klass->generic_class->container_class;
490 method_container_class = ji->method->klass;
492 /* class might refer to a subclass of ji->method's class */
493 while (class->generic_class && class->generic_class->container_class != method_container_class) {
494 class = class->parent;
498 if (class->generic_class || class->generic_container)
499 context.class_inst = mini_class_get_context (class)->class_inst;
501 if (class->generic_class)
502 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
504 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
510 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
512 MonoGenericContext context;
515 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
517 context = get_generic_context_from_stack_frame (ji, generic_info);
519 method = mono_method_get_declaring_generic_method (ji->method);
520 method = mono_class_inflate_generic_method (method, &context);
526 ves_icall_System_Exception_get_trace (MonoException *ex)
528 MonoDomain *domain = mono_domain_get ();
530 MonoArray *ta = ex->trace_ips;
535 /* Exception is not thrown yet */
538 len = mono_array_length (ta) >> 1;
539 trace_str = g_string_new ("");
540 for (i = 0; i < len; i++) {
542 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
543 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
545 ji = mono_jit_info_table_find (domain, ip);
547 /* Unmanaged frame */
548 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
552 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
554 address = (char *)ip - (char *)ji->code_start;
555 location = mono_debug_print_stack_frame (
556 method, address, ex->object.vtable->domain);
558 g_string_append_printf (trace_str, "%s\n", location);
563 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
564 g_string_free (trace_str, TRUE);
570 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
572 MonoDomain *domain = mono_domain_get ();
574 MonoArray *ta = exc->trace_ips;
575 MonoDebugSourceLocation *location;
579 /* Exception is not thrown yet */
580 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
583 len = mono_array_length (ta) >> 1;
585 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
587 for (i = skip; i < len; i++) {
589 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
590 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
591 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
594 ji = mono_jit_info_table_find (domain, ip);
596 /* Unmanaged frame */
597 mono_array_setref (res, i, sf);
601 g_assert (ji != NULL);
603 method = get_method_from_stack_frame (ji, generic_info);
604 if (ji->method->wrapper_type) {
608 s = mono_method_full_name (method, TRUE);
609 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
613 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
614 sf->native_offset = (char *)ip - (char *)ji->code_start;
617 * mono_debug_lookup_source_location() returns both the file / line number information
618 * and the IL offset. Note that computing the IL offset is already an expensive
619 * operation, so we shouldn't call this method twice.
621 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
623 sf->il_offset = location->il_offset;
627 if (need_file_info) {
628 if (location && location->source_file) {
629 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
630 sf->line = location->row;
631 sf->column = location->column;
633 sf->line = sf->column = 0;
638 mono_debug_free_source_location (location);
639 mono_array_setref (res, i, sf);
647 * @domain: starting appdomain
648 * @jit_tls: JIT data for the thread
649 * @start_ctx: starting state of the stack frame
650 * @func: callback to call for each stack frame
651 * @user_data: data passed to the callback
653 * This function walks the stack of a thread, starting from the state
654 * represented by jit_tls and start_ctx. For each frame the callback
655 * function is called with the relevant info. The walk ends when no more
656 * managed stack frames are found or when the callback returns a TRUE value.
657 * Note that the function can be used to walk the stack of a thread
658 * different from the current.
661 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
663 mono_walk_stack_full (domain, jit_tls, start_ctx, func, TRUE, user_data);
667 mono_walk_stack_full (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gboolean use_new_ctx, gpointer user_data)
669 MonoLMF *lmf = mono_get_lmf ();
670 MonoJitInfo *ji, rji;
673 MonoContext ctx, new_ctx;
677 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
679 * FIXME: mono_find_jit_info () will need to be able to return a different
680 * MonoDomain when apddomain transitions are found on the stack.
682 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
683 if (!ji || ji == (gpointer)-1)
686 if (func (domain, use_new_ctx ? &new_ctx : &ctx, ji, user_data))
694 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
696 MonoDomain *domain = mono_domain_get ();
697 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
698 MonoLMF *lmf = mono_get_lmf ();
699 MonoJitInfo *ji, rji;
700 gint native_offset, il_offset;
702 MonoContext ctx, new_ctx;
704 MONO_ARCH_CONTEXT_DEF
706 mono_arch_flush_register_windows ();
709 memcpy (&ctx, start_ctx, sizeof (MonoContext));
711 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
712 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
714 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
718 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
719 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
722 if (ji == (gpointer)-1)
726 MonoDebugSourceLocation *source;
728 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
729 il_offset = source ? source->il_offset : -1;
730 mono_debug_free_source_location (source);
734 if (func (ji->method, native_offset, il_offset, managed, user_data))
742 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
744 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
748 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)
750 MonoJitTlsData *jit_tls = thread->jit_data;
752 MonoContext ctx, new_ctx;
753 StackFrameInfo frame;
754 #ifndef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
757 MonoJitInfo *ji, rji;
762 MONO_ARCH_CONTEXT_DEF
764 mono_arch_flush_register_windows ();
767 memcpy (&ctx, start_ctx, sizeof (MonoContext));
769 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
770 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
772 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
774 g_assert (thread == mono_thread_internal_current ());
777 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
779 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
780 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, &frame);
784 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
786 frame.type = FRAME_TYPE_MANAGED;
788 frame.managed = managed;
789 frame.native_offset = native_offset;
791 if (ji == (gpointer)-1)
795 if (do_il_offset && frame.ji) {
796 MonoDebugSourceLocation *source;
798 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
799 il_offset = source ? source->il_offset : -1;
800 mono_debug_free_source_location (source);
804 frame.il_offset = il_offset;
806 if (func (&frame, &ctx, user_data))
815 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
816 MonoReflectionMethod **method,
817 gint32 *iloffset, gint32 *native_offset,
818 MonoString **file, gint32 *line, gint32 *column)
820 MonoDomain *domain = mono_domain_get ();
821 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
822 MonoLMF *lmf = mono_get_lmf ();
823 MonoJitInfo *ji, rji;
824 MonoContext ctx, new_ctx, ji_ctx;
825 MonoDebugSourceLocation *location;
826 MonoMethod *last_method = NULL, *actual_method;
828 MONO_ARCH_CONTEXT_DEF;
830 mono_arch_flush_register_windows ();
832 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
833 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
835 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
840 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
843 if (ji && ji != (gpointer)-1 &&
844 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
845 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
849 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
852 /* skip all wrappers ??*/
853 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
854 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
855 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
856 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
857 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
858 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
861 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
863 * FIXME: Native-to-managed wrappers sometimes show up twice.
864 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
870 last_method = ji->method;
876 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
878 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
880 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
882 *iloffset = location->il_offset;
886 if (need_file_info) {
888 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
889 *line = location->row;
890 *column = location->column;
897 mono_debug_free_source_location (location);
904 MonoSecurityFrame *frame;
905 } MonoFrameSecurityInfo;
908 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
910 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
912 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
913 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
914 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
915 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
916 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
917 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
926 si->frame = mono_declsec_create_frame (domain, ji);
928 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
933 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
934 * @skip: the number of stack frames to skip
936 * This function returns a the security informations of a single stack frame
937 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
938 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
942 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
944 MonoDomain *domain = mono_domain_get ();
945 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
946 MonoFrameSecurityInfo si;
949 MONO_ARCH_CONTEXT_DEF
951 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
952 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
954 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
957 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
963 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
965 return (si.skips == 0) ? si.frame : NULL;
977 grow_array (MonoSecurityStack *stack)
979 MonoDomain *domain = mono_domain_get ();
980 guint32 newsize = (stack->maximum << 1);
981 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
983 for (i=0; i < stack->maximum; i++) {
984 gpointer frame = mono_array_get (stack->stack, gpointer, i);
985 mono_array_setref (newstack, i, frame);
987 stack->maximum = newsize;
988 stack->stack = newstack;
992 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
994 MonoSecurityStack *ss = (MonoSecurityStack*) data;
996 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
997 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
998 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
999 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
1000 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
1001 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
1005 if (ss->skips > 0) {
1010 if (ss->count == ss->maximum)
1013 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
1015 /* continue down the stack */
1020 glist_to_array (GList *list, MonoClass *eclass)
1022 MonoDomain *domain = mono_domain_get ();
1029 len = g_list_length (list);
1030 res = mono_array_new (domain, eclass, len);
1032 for (i = 0; list; list = list->next, i++)
1033 mono_array_set (res, gpointer, i, list->data);
1039 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1040 * @skip: the number of stack frames to skip
1042 * This function returns an managed array of containing the security
1043 * informations for each frame (after the skipped ones). This is used for
1044 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1048 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1050 MonoDomain *domain = mono_domain_get ();
1051 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1052 MonoSecurityStack ss;
1055 MONO_ARCH_CONTEXT_DEF
1057 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1058 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1060 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
1063 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1069 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1070 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
1071 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
1072 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1077 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1079 MonoClass *catch_class = ei->data.catch_class;
1080 MonoType *inflated_type;
1081 MonoGenericContext context;
1083 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1084 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1087 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1089 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1091 /* FIXME: we shouldn't inflate but instead put the
1092 type in the rgctx and fetch it from there. It
1093 might be a good idea to do this lazily, i.e. only
1094 when the exception is actually thrown, so as not to
1095 waste space for exception clauses which might never
1097 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1098 catch_class = mono_class_from_mono_type (inflated_type);
1099 mono_metadata_free_type (inflated_type);
1105 * mini_jit_info_table_find:
1107 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1108 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1109 * OUT_DOMAIN if it is not NULL.
1112 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1115 MonoInternalThread *t = mono_thread_internal_current ();
1121 ji = mono_jit_info_table_find (domain, addr);
1124 *out_domain = domain;
1128 /* maybe it is shared code, so we also search in the root domain */
1129 if (domain != mono_get_root_domain ()) {
1130 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1133 *out_domain = mono_get_root_domain ();
1138 for (l = t->appdomain_refs; l; l = l->next) {
1139 if (l->data != domain) {
1140 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1143 *out_domain = (MonoDomain*)l->data;
1153 * mono_handle_exception_internal:
1154 * @ctx: saved processor state
1155 * @obj: the exception object
1156 * @test_only: only test if the exception is caught, but dont call handlers
1157 * @out_filter_idx: out parameter. if test_only is true, set to the index of
1158 * the first filter clause which caught the exception.
1159 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1162 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gboolean resume, gint32 *out_filter_idx, MonoJitInfo **out_ji)
1164 MonoDomain *domain = mono_domain_get ();
1165 MonoJitInfo *ji, rji;
1166 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1167 static void (*restore_context) (void *);
1168 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1169 MonoLMF *lmf = mono_get_lmf ();
1170 MonoArray *initial_trace_ips = NULL;
1171 GList *trace_ips = NULL;
1172 MonoException *mono_ex;
1173 gboolean stack_overflow = FALSE;
1174 MonoContext initial_ctx;
1175 int frame_count = 0;
1176 gboolean has_dynamic_methods = FALSE;
1177 gint32 filter_idx, first_filter_idx;
1180 g_assert (ctx != NULL);
1182 MonoException *ex = mono_get_exception_null_reference ();
1183 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1184 obj = (MonoObject *)ex;
1188 * Allocate a new exception object instead of the preconstructed ones.
1190 if (obj == domain->stack_overflow_ex) {
1192 * It is not a good idea to try and put even more pressure on the little stack available.
1193 * obj = mono_get_exception_stack_overflow ();
1195 stack_overflow = TRUE;
1197 else if (obj == domain->null_reference_ex) {
1198 obj = mono_get_exception_null_reference ();
1201 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1202 mono_ex = (MonoException*)obj;
1203 initial_trace_ips = mono_ex->trace_ips;
1208 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1209 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1210 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1211 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1212 mono_ex->message = mono_string_new (domain, msg);
1219 call_filter = mono_get_call_filter ();
1221 if (!restore_context)
1222 restore_context = mono_get_restore_context ();
1224 g_assert (jit_tls->end_of_stack);
1225 g_assert (jit_tls->abort_func);
1228 MonoContext ctx_cp = *ctx;
1229 if (mono_trace_is_enabled ()) {
1230 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1231 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1232 MonoObject *message;
1233 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1235 MonoObject *exc = NULL;
1236 if (get_message == NULL) {
1238 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1240 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1242 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1246 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1248 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1250 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1251 mono_print_thread_dump_from_ctx (ctx);
1253 mono_profiler_exception_thrown (obj);
1254 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, FALSE, &first_filter_idx, out_ji)) {
1255 if (mono_break_on_exc)
1257 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1258 // FIXME: This runs managed code so it might cause another stack overflow when
1259 // we are handling a stack overflow
1260 mono_unhandled_exception (obj);
1262 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1267 *out_filter_idx = -1;
1272 memset (&rji, 0, sizeof (rji));
1275 MonoContext new_ctx;
1278 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1279 NULL, &lmf, NULL, NULL);
1281 g_warning ("Exception inside function without unwind info");
1282 g_assert_not_reached ();
1285 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))))) {
1287 * The exception was raised in native code and we got back to managed code
1294 if (ji != (gpointer)-1) {
1296 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
1298 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1300 * Avoid overwriting the stack trace if the exception is
1301 * rethrown. Also avoid giant stack traces during a stack
1304 if (!initial_trace_ips && (frame_count < 1000)) {
1305 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1306 trace_ips = g_list_prepend (trace_ips,
1307 get_generic_info_from_stack_frame (ji, ctx));
1311 if (ji->method->dynamic)
1312 has_dynamic_methods = TRUE;
1315 #ifndef MONO_ARCH_STACK_GROWS_UP
1316 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1318 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1321 free_stack = 0xffffff;
1324 * During stack overflow, wait till the unwinding frees some stack
1325 * space before running handlers/finalizers.
1327 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1330 for (i = 0; i < ji->num_clauses; i++) {
1331 MonoJitExceptionInfo *ei = &ji->clauses [i];
1332 gboolean filtered = FALSE;
1334 #if defined(__s390__)
1336 * This is required in cases where a try block starts immediately after
1337 * a call which causes an exception. Testcase: tests/exception8.cs.
1338 * FIXME: Clean this up.
1340 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) && MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1342 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1345 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1347 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1348 if (ji->from_llvm) {
1349 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1350 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, obj);
1352 g_assert_not_reached ();
1355 /* store the exception object in bp + ei->exvar_offset */
1356 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1360 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1362 mono_perfcounters->exceptions_filters++;
1363 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1364 filtered = call_filter (ctx, ei->data.filter);
1365 if (filtered && out_filter_idx)
1366 *out_filter_idx = filter_idx;
1372 * Filter clauses should only be run in the
1373 * first pass of exception handling.
1375 filtered = (filter_idx == first_filter_idx);
1380 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1381 mono_object_isinst (obj, catch_class)) || filtered) {
1383 if (mono_ex && !initial_trace_ips) {
1384 trace_ips = g_list_reverse (trace_ips);
1385 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1386 if (has_dynamic_methods)
1387 /* These methods could go away anytime, so compute the stack trace now */
1388 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1390 g_list_free (trace_ips);
1395 * This guards against the situation that we abort a thread that is executing a finally clause
1396 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1397 * check for this situation here and resume interruption if we are below the guarded block.
1399 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1400 gboolean is_outside = FALSE;
1401 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->ex_ctx);
1402 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1403 //FIXME make this stack direction aware
1404 if (catch_bp > prot_bp) {
1406 } else if (catch_bp == prot_bp) {
1407 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1408 * So we check if the catch handler_start is protected by the guarded handler protected region
1411 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1412 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1413 * There aren't any further finally/fault handler blocks down the stack over this exception.
1414 * This must be ensured by the code that installs the guard trampoline.
1416 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->ex_ctx), NULL));
1418 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1423 jit_tls->handler_block_return_address = NULL;
1424 jit_tls->handler_block = NULL;
1425 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1429 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1430 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1431 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1432 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1433 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1434 *(mono_get_lmf_addr ()) = lmf;
1435 mono_perfcounters->exceptions_depth += frame_count;
1436 if (obj == domain->stack_overflow_ex)
1437 jit_tls->handling_stack_ovf = FALSE;
1441 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1442 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1443 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1444 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1445 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1446 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1447 call_filter (ctx, ei->handler_start);
1449 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1450 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1451 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1452 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1453 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1454 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1455 mono_perfcounters->exceptions_finallys++;
1456 *(mono_get_lmf_addr ()) = lmf;
1457 if (ji->from_llvm) {
1459 * LLVM compiled finally handlers follow the design
1460 * of the c++ ehabi, i.e. they call a resume function
1461 * at the end instead of returning to the caller.
1462 * So save the exception handling state,
1463 * mono_resume_unwind () will call us again to continue
1466 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1467 *(mono_get_lmf_addr ()) = lmf;
1468 jit_tls->ex_ctx = new_ctx;
1469 jit_tls->ex_obj = obj;
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 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1661 /* mprotect can fail for the main thread stack */
1662 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);
1663 g_assert (gaddr == tls->stack_ovf_guard_base);
1664 tls->stack_ovf_valloced = TRUE;
1668 * threads created by nptl does not seem to have a guard page, and
1669 * since the main thread is not created by us, we can't even set one.
1670 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1671 * is a stack overflow exception.
1673 tls->stack_size = stsize + mono_pagesize ();
1675 /* Setup an alternate signal stack */
1676 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1677 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1679 g_assert (tls->signal_stack);
1681 sa.ss_sp = tls->signal_stack;
1682 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1683 sa.ss_flags = SS_ONSTACK;
1684 sigaltstack (&sa, NULL);
1688 mono_free_altstack (MonoJitTlsData *tls)
1690 struct sigaltstack sa;
1693 sa.ss_sp = tls->signal_stack;
1694 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1695 sa.ss_flags = SS_DISABLE;
1696 err = sigaltstack (&sa, NULL);
1697 g_assert (err == 0);
1699 if (tls->signal_stack)
1700 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1701 if (tls->stack_ovf_valloced)
1702 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1704 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1707 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1710 mono_setup_altstack (MonoJitTlsData *tls)
1715 mono_free_altstack (MonoJitTlsData *tls)
1719 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1722 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1724 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1725 /* we need to leave some room for throwing the exception */
1726 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1727 unprotect_size -= mono_pagesize ();
1728 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1729 * is sufficient stack
1731 //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);
1733 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1734 return unprotect_size == jit_tls->stack_ovf_guard_size;
1738 try_more_restore (void)
1740 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1741 if (try_restore_stack_protection (jit_tls, 500))
1742 jit_tls->restore_stack_prot = NULL;
1746 restore_stack_protection (void)
1748 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1749 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1750 /* if we can't restore the stack protection, keep a callback installed so
1751 * we'll try to restore as much stack as we can at each return from unmanaged
1754 if (try_restore_stack_protection (jit_tls, 4096))
1755 jit_tls->restore_stack_prot = NULL;
1757 jit_tls->restore_stack_prot = try_more_restore_tramp;
1758 /* here we also throw a stack overflow exception */
1759 ex->trace_ips = NULL;
1760 ex->stack_trace = NULL;
1761 mono_raise_exception (ex);
1765 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1767 void (*func)(void) = (gpointer)tramp_data;
1773 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1775 /* we got a stack overflow in the soft-guard pages
1776 * There are two cases:
1777 * 1) managed code caused the overflow: we unprotect the soft-guard page
1778 * and let the arch-specific code trigger the exception handling mechanism
1779 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1780 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1781 * and hope we can continue with those enabled, at least until the hard-guard page
1782 * is hit. The alternative to continuing here is to just print a message and abort.
1783 * We may add in the future the code to protect the pages again in the codepath
1784 * when we return from unmanaged to managed code.
1786 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1787 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1788 /* we unprotect the minimum amount we can */
1790 gboolean handled = FALSE;
1792 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1793 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1794 guard_size -= mono_pagesize ();
1796 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1797 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1798 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);
1799 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1801 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1806 /* We print a message: after this even managed stack overflows
1807 * may crash the runtime
1809 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1810 if (!jit_tls->handling_stack_ovf) {
1811 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1812 jit_tls->handling_stack_ovf = 1;
1814 /*fprintf (stderr, "Already handling stack overflow\n");*/
1823 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1825 FILE *stream = (FILE*)data;
1828 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1829 fprintf (stream, " %s\n", location);
1832 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1837 static G_GNUC_UNUSED gboolean
1838 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1841 GString *p = (GString*)data;
1844 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1845 g_string_append_printf (p, " %s\n", location);
1848 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1853 static gboolean handling_sigsegv = FALSE;
1856 * mono_handle_native_sigsegv:
1858 * Handle a SIGSEGV received while in native code by printing diagnostic
1859 * information and aborting.
1862 mono_handle_native_sigsegv (int signal, void *ctx)
1864 #ifdef MONO_ARCH_USE_SIGACTION
1865 struct sigaction sa;
1867 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1869 if (handling_sigsegv)
1872 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1873 fprintf (stderr, "Received SIGSEGV, suspending...");
1878 /* To prevent infinite loops when the stack walk causes a crash */
1879 handling_sigsegv = TRUE;
1881 /* !jit_tls means the thread was not registered with the runtime */
1882 if (jit_tls && mono_thread_internal_current ()) {
1883 fprintf (stderr, "Stacktrace:\n\n");
1885 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1890 #ifdef HAVE_BACKTRACE_SYMBOLS
1895 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1897 fprintf (stderr, "\nNative stacktrace:\n\n");
1899 size = backtrace (array, 256);
1900 names = backtrace_symbols (array, size);
1901 for (i =0; i < size; ++i) {
1902 fprintf (stderr, "\t%s\n", names [i]);
1908 /* Try to get more meaningful information using gdb */
1910 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1911 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1912 /* From g_spawn_command_line_sync () in eglib */
1914 int stdout_pipe [2] = { -1, -1 };
1919 res = pipe (stdout_pipe);
1920 g_assert (res != -1);
1924 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1925 * it will deadlock. Call the syscall directly instead.
1927 pid = mono_runtime_syscall_fork ();
1930 close (stdout_pipe [0]);
1931 dup2 (stdout_pipe [1], STDOUT_FILENO);
1933 for (i = getdtablesize () - 1; i >= 3; i--)
1936 if (!mono_gdb_render_native_backtraces ())
1937 close (STDOUT_FILENO);
1942 close (stdout_pipe [1]);
1944 fprintf (stderr, "\nDebug info from gdb:\n\n");
1947 int nread = read (stdout_pipe [0], buffer, 1024);
1951 write (STDERR_FILENO, buffer, nread);
1954 waitpid (pid, &status, WNOHANG);
1958 * A SIGSEGV indicates something went very wrong so we can no longer depend
1959 * on anything working. So try to print out lots of diagnostics, starting
1960 * with ones which have a greater chance of working.
1964 "=================================================================\n"
1965 "Got a %s while executing native code. This usually indicates\n"
1966 "a fatal error in the mono runtime or one of the native libraries \n"
1967 "used by your application.\n"
1968 "=================================================================\n"
1974 #ifdef MONO_ARCH_USE_SIGACTION
1976 /* Remove our SIGABRT handler */
1977 sa.sa_handler = SIG_DFL;
1978 sigemptyset (&sa.sa_mask);
1981 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1989 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
1991 MonoInternalThread *thread = mono_thread_internal_current ();
1992 #if defined(__i386__) || defined(__x86_64__)
1995 GString* text = g_string_new (0);
1996 char *name, *wapi_desc;
1997 GError *error = NULL;
2000 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2002 g_string_append_printf (text, "\n\"%s\"", name);
2005 else if (thread->threadpool_thread)
2006 g_string_append (text, "\n\"<threadpool thread>\"");
2008 g_string_append (text, "\n\"<unnamed thread>\"");
2011 wapi_desc = wapi_current_thread_desc ();
2012 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2016 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2018 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2020 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2022 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2024 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
2026 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2029 fprintf (stdout, "%s", text->str);
2030 g_string_free (text, TRUE);
2035 * mono_print_thread_dump:
2037 * Print information about the current thread to stdout.
2038 * SIGCTX can be NULL, allowing this to be called from gdb.
2041 mono_print_thread_dump (void *sigctx)
2043 mono_print_thread_dump_internal (sigctx, NULL);
2047 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2049 mono_print_thread_dump_internal (NULL, ctx);
2053 * mono_resume_unwind:
2055 * This is called by code at the end of LLVM compiled finally clauses to continue
2059 mono_resume_unwind (void)
2061 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2062 static void (*restore_context) (MonoContext *);
2065 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
2067 mono_handle_exception_internal (&ctx, jit_tls->ex_obj, NULL, FALSE, TRUE, NULL, NULL);
2069 if (!restore_context)
2070 restore_context = mono_get_restore_context ();
2072 restore_context (&ctx);
2075 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2080 MonoJitExceptionInfo *ei;
2081 } FindHandlerBlockData;
2084 find_last_handler_block (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
2088 FindHandlerBlockData *pdata = data;
2090 if (ji->method->wrapper_type)
2093 ip = MONO_CONTEXT_GET_IP (ctx);
2095 for (i = 0; i < ji->num_clauses; ++i) {
2096 MonoJitExceptionInfo *ei = ji->clauses + i;
2097 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2099 /*If ip points to the first instruction it means the handler block didn't start
2100 so we can leave its execution to the EH machinery*/
2101 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2113 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2116 MonoJitExceptionInfo *clause = NULL;
2119 ip = MONO_CONTEXT_GET_IP (ctx);
2121 for (i = 0; i < ji->num_clauses; ++i) {
2122 clause = &ji->clauses [i];
2123 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2125 if (clause->handler_start < ip && clause->data.handler_end > ip)
2129 /*no matching finally */
2130 if (i == ji->num_clauses)
2133 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2134 if (ip == clause->handler_start)
2137 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2141 * Finds the bottom handler block running and install a block guard if needed.
2144 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)
2146 FindHandlerBlockData data = { 0 };
2147 MonoDomain *domain = mono_domain_get ();
2148 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2151 if (jit_tls->handler_block_return_address)
2154 mono_walk_stack_full (domain, jit_tls, ctx, find_last_handler_block, FALSE, &data);
2159 memcpy (&jit_tls->ex_ctx, &data.ctx, sizeof (MonoContext));
2161 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2162 if (resume_ip == NULL)
2165 jit_tls->handler_block_return_address = resume_ip;
2166 jit_tls->handler_block = data.ei;
2169 /*Clear current thread from been wapi interrupted otherwise things can go south*/
2170 wapi_clear_interruption ();
2177 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)