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;
143 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
144 if (throw_corlib_exception_func)
145 return throw_corlib_exception_func;
147 #if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
149 code = mono_aot_get_trampoline ("throw_corlib_exception");
151 code = mono_arch_get_throw_corlib_exception (NULL, FALSE);
153 g_assert_not_reached ();
156 mono_memory_barrier ();
158 throw_corlib_exception_func = code;
160 return throw_corlib_exception_func;
164 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
166 MonoTryBlockHoleTableJitInfo *table;
171 /*FIXME check if under s390 it should be ei->try_start >= ip*/
172 if (ei->try_start > ip || ip >= ei->try_end)
175 if (!ji->has_try_block_holes)
178 table = mono_jit_info_get_try_block_hole_table_info (ji);
179 offset = (guint32)((char*)ip - (char*)ji->code_start);
180 clause = (guint16)(ei - ji->clauses);
181 g_assert (clause < ji->num_clauses);
183 for (i = 0; i < table->num_holes; ++i) {
184 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
185 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
191 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
194 * find_jit_info_no_ext:
196 * If the target has the find_jit_info_ext version of this function, define the old
197 * version here which translates between the old and new APIs.
200 find_jit_info_no_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
201 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
203 StackFrameInfo frame;
206 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
208 /* Avoid costly table lookup during stack overflow */
209 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
212 ji = mini_jit_info_table_find (domain, ip, NULL);
217 err = mono_arch_find_jit_info_ext (domain, jit_tls, ji, ctx, new_ctx, lmf, &frame);
221 /* Convert between the new and the old APIs */
222 switch (frame.type) {
223 case FRAME_TYPE_MANAGED:
227 case FRAME_TYPE_MANAGED_TO_NATIVE:
231 memset (res, 0, sizeof (MonoJitInfo));
232 res->method = frame.method;
235 case FRAME_TYPE_DEBUGGER_INVOKE: {
239 * The normal exception handling code can't handle this frame, so just
242 ji = find_jit_info_no_ext (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
243 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
247 g_assert_not_reached ();
254 /* mono_find_jit_info:
256 * This function is used to gather information from @ctx. It return the
257 * MonoJitInfo of the corresponding function, unwinds one stack frame and
258 * stores the resulting context into @new_ctx. It also stores a string
259 * describing the stack location into @trace (if not NULL), and modifies
260 * the @lmf if necessary. @native_offset return the IP offset from the
261 * start of the function or -1 if that info is not available.
264 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
265 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
269 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
281 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
282 ji = find_jit_info_no_ext (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
284 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
287 if (ji == (gpointer)-1)
290 if (managed2 || (ji && ji->method->wrapper_type)) {
291 const char *real_ip, *start;
294 start = (const char *)ji->code_start;
296 /* ctx->ip points into native code */
297 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
299 real_ip = (const char*)ip;
301 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
302 offset = real_ip - start;
307 *native_offset = offset;
310 if (!ji->method->wrapper_type)
314 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
317 char *fname = mono_method_full_name (res->method, TRUE);
318 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
326 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
329 * mono_find_jit_info_ext:
331 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
335 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
336 MonoJitInfo *prev_ji, MonoContext *ctx,
337 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
338 StackFrameInfo *frame)
341 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
343 MonoDomain *target_domain;
348 /* Avoid costly table lookup during stack overflow */
349 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
352 ji = mini_jit_info_table_find (domain, ip, &target_domain);
355 target_domain = domain;
357 err = mono_arch_find_jit_info_ext (target_domain, jit_tls, ji, ctx, new_ctx, lmf, frame);
361 frame->native_offset = -1;
362 frame->domain = target_domain;
366 if (ji && (frame->managed || ji->method->wrapper_type)) {
367 const char *real_ip, *start;
369 start = (const char *)ji->code_start;
371 /* ctx->ip points into native code */
372 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
374 real_ip = (const char*)ip;
376 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
377 frame->native_offset = real_ip - start;
379 frame->native_offset = -1;
382 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
384 if (trace && frame->method) {
385 char *fname = mono_method_full_name (frame->method, TRUE);
386 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
394 #endif /* MONO_ARCH_HAVE_FIND_JIT_INFO_EXT */
397 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
399 MonoGenericJitInfo *gi;
402 if (!ji->has_generic_jit_info)
404 gi = mono_jit_info_get_generic_jit_info (ji);
409 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
411 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
413 if (mono_method_get_context (ji->method)->method_inst) {
415 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
418 /* Avoid returning a managed object */
419 MonoObject *this_obj = info;
421 return this_obj->vtable->klass;
425 static MonoGenericContext
426 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
428 MonoGenericContext context = { NULL, NULL };
429 MonoClass *class, *method_container_class;
431 g_assert (generic_info);
433 g_assert (ji->method->is_inflated);
434 if (mono_method_get_context (ji->method)->method_inst) {
435 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
437 class = mrgctx->class_vtable->klass;
438 context.method_inst = mrgctx->method_inst;
439 g_assert (context.method_inst);
440 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
441 MonoVTable *vtable = generic_info;
443 class = vtable->klass;
445 class = generic_info;
448 //g_assert (!ji->method->klass->generic_container);
449 if (ji->method->klass->generic_class)
450 method_container_class = ji->method->klass->generic_class->container_class;
452 method_container_class = ji->method->klass;
454 /* class might refer to a subclass of ji->method's class */
455 while (class->generic_class && class->generic_class->container_class != method_container_class) {
456 class = class->parent;
460 if (class->generic_class || class->generic_container)
461 context.class_inst = mini_class_get_context (class)->class_inst;
463 if (class->generic_class)
464 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
466 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
472 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
474 MonoGenericContext context;
477 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
479 context = get_generic_context_from_stack_frame (ji, generic_info);
481 method = mono_method_get_declaring_generic_method (ji->method);
482 method = mono_class_inflate_generic_method (method, &context);
488 ves_icall_System_Exception_get_trace (MonoException *ex)
490 MonoDomain *domain = mono_domain_get ();
492 MonoArray *ta = ex->trace_ips;
497 /* Exception is not thrown yet */
500 len = mono_array_length (ta) >> 1;
501 trace_str = g_string_new ("");
502 for (i = 0; i < len; i++) {
504 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
505 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
507 ji = mono_jit_info_table_find (domain, ip);
509 /* Unmanaged frame */
510 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
514 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
516 address = (char *)ip - (char *)ji->code_start;
517 location = mono_debug_print_stack_frame (
518 method, address, ex->object.vtable->domain);
520 g_string_append_printf (trace_str, "%s\n", location);
525 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
526 g_string_free (trace_str, TRUE);
532 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
534 MonoDomain *domain = mono_domain_get ();
536 MonoArray *ta = exc->trace_ips;
537 MonoDebugSourceLocation *location;
541 /* Exception is not thrown yet */
542 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
545 len = mono_array_length (ta) >> 1;
547 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
549 for (i = skip; i < len; i++) {
551 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
552 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
553 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
556 ji = mono_jit_info_table_find (domain, ip);
558 /* Unmanaged frame */
559 mono_array_setref (res, i, sf);
563 g_assert (ji != NULL);
565 method = get_method_from_stack_frame (ji, generic_info);
566 if (ji->method->wrapper_type) {
570 s = mono_method_full_name (method, TRUE);
571 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
575 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
576 sf->native_offset = (char *)ip - (char *)ji->code_start;
579 * mono_debug_lookup_source_location() returns both the file / line number information
580 * and the IL offset. Note that computing the IL offset is already an expensive
581 * operation, so we shouldn't call this method twice.
583 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
585 sf->il_offset = location->il_offset;
589 if (need_file_info) {
590 if (location && location->source_file) {
591 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
592 sf->line = location->row;
593 sf->column = location->column;
595 sf->line = sf->column = 0;
600 mono_debug_free_source_location (location);
601 mono_array_setref (res, i, sf);
609 * @domain: starting appdomain
610 * @jit_tls: JIT data for the thread
611 * @start_ctx: starting state of the stack frame
612 * @func: callback to call for each stack frame
613 * @user_data: data passed to the callback
615 * This function walks the stack of a thread, starting from the state
616 * represented by jit_tls and start_ctx. For each frame the callback
617 * function is called with the relevant info. The walk ends when no more
618 * managed stack frames are found or when the callback returns a TRUE value.
619 * Note that the function can be used to walk the stack of a thread
620 * different from the current.
623 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
625 mono_walk_stack_full (domain, jit_tls, start_ctx, func, TRUE, user_data);
629 mono_walk_stack_full (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gboolean use_new_ctx, gpointer user_data)
631 MonoLMF *lmf = mono_get_lmf ();
632 MonoJitInfo *ji, rji;
635 MonoContext ctx, new_ctx;
639 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
641 * FIXME: mono_find_jit_info () will need to be able to return a different
642 * MonoDomain when apddomain transitions are found on the stack.
644 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
645 if (!ji || ji == (gpointer)-1)
648 if (func (domain, use_new_ctx ? &new_ctx : &ctx, ji, user_data))
656 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
658 MonoDomain *domain = mono_domain_get ();
659 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
660 MonoLMF *lmf = mono_get_lmf ();
661 MonoJitInfo *ji, rji;
662 gint native_offset, il_offset;
664 MonoContext ctx, new_ctx;
666 MONO_ARCH_CONTEXT_DEF
668 mono_arch_flush_register_windows ();
671 memcpy (&ctx, start_ctx, sizeof (MonoContext));
673 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
674 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
676 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
680 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
681 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
684 if (ji == (gpointer)-1)
688 MonoDebugSourceLocation *source;
690 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
691 il_offset = source ? source->il_offset : -1;
692 mono_debug_free_source_location (source);
696 if (func (ji->method, native_offset, il_offset, managed, user_data))
704 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
706 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
710 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)
712 MonoJitTlsData *jit_tls = thread->jit_data;
714 MonoContext ctx, new_ctx;
715 StackFrameInfo frame;
716 #ifndef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
719 MonoJitInfo *ji, rji;
724 MONO_ARCH_CONTEXT_DEF
726 mono_arch_flush_register_windows ();
729 memcpy (&ctx, start_ctx, sizeof (MonoContext));
731 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
732 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
734 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
736 g_assert (thread == mono_thread_internal_current ());
739 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
741 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
742 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, &frame);
746 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
748 frame.type = FRAME_TYPE_MANAGED;
750 frame.managed = managed;
751 frame.native_offset = native_offset;
753 if (ji == (gpointer)-1)
757 if (do_il_offset && frame.ji) {
758 MonoDebugSourceLocation *source;
760 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
761 il_offset = source ? source->il_offset : -1;
762 mono_debug_free_source_location (source);
766 frame.il_offset = il_offset;
768 if (func (&frame, &ctx, user_data))
777 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
778 MonoReflectionMethod **method,
779 gint32 *iloffset, gint32 *native_offset,
780 MonoString **file, gint32 *line, gint32 *column)
782 MonoDomain *domain = mono_domain_get ();
783 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
784 MonoLMF *lmf = mono_get_lmf ();
785 MonoJitInfo *ji, rji;
786 MonoContext ctx, new_ctx, ji_ctx;
787 MonoDebugSourceLocation *location;
788 MonoMethod *last_method = NULL, *actual_method;
790 MONO_ARCH_CONTEXT_DEF;
792 mono_arch_flush_register_windows ();
794 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
795 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
797 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
802 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
805 if (ji && ji != (gpointer)-1 &&
806 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
807 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
811 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
814 /* skip all wrappers ??*/
815 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
816 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
817 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
818 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
819 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
820 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
823 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
825 * FIXME: Native-to-managed wrappers sometimes show up twice.
826 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
832 last_method = ji->method;
838 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
840 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
842 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
844 *iloffset = location->il_offset;
848 if (need_file_info) {
850 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
851 *line = location->row;
852 *column = location->column;
859 mono_debug_free_source_location (location);
866 MonoSecurityFrame *frame;
867 } MonoFrameSecurityInfo;
870 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
872 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
874 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
875 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
876 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
877 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
878 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
879 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
888 si->frame = mono_declsec_create_frame (domain, ji);
890 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
895 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
896 * @skip: the number of stack frames to skip
898 * This function returns a the security informations of a single stack frame
899 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
900 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
904 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
906 MonoDomain *domain = mono_domain_get ();
907 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
908 MonoFrameSecurityInfo si;
911 MONO_ARCH_CONTEXT_DEF
913 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
914 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
916 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
919 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
925 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
927 return (si.skips == 0) ? si.frame : NULL;
939 grow_array (MonoSecurityStack *stack)
941 MonoDomain *domain = mono_domain_get ();
942 guint32 newsize = (stack->maximum << 1);
943 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
945 for (i=0; i < stack->maximum; i++) {
946 gpointer frame = mono_array_get (stack->stack, gpointer, i);
947 mono_array_setref (newstack, i, frame);
949 stack->maximum = newsize;
950 stack->stack = newstack;
954 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
956 MonoSecurityStack *ss = (MonoSecurityStack*) data;
958 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
959 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
960 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
961 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
962 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
963 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
972 if (ss->count == ss->maximum)
975 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
977 /* continue down the stack */
982 glist_to_array (GList *list, MonoClass *eclass)
984 MonoDomain *domain = mono_domain_get ();
991 len = g_list_length (list);
992 res = mono_array_new (domain, eclass, len);
994 for (i = 0; list; list = list->next, i++)
995 mono_array_set (res, gpointer, i, list->data);
1001 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1002 * @skip: the number of stack frames to skip
1004 * This function returns an managed array of containing the security
1005 * informations for each frame (after the skipped ones). This is used for
1006 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1010 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1012 MonoDomain *domain = mono_domain_get ();
1013 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1014 MonoSecurityStack ss;
1017 MONO_ARCH_CONTEXT_DEF
1019 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1020 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1022 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
1025 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1031 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1032 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
1033 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
1034 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1039 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1041 MonoClass *catch_class = ei->data.catch_class;
1042 MonoType *inflated_type;
1043 MonoGenericContext context;
1045 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1046 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1049 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1051 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1053 /* FIXME: we shouldn't inflate but instead put the
1054 type in the rgctx and fetch it from there. It
1055 might be a good idea to do this lazily, i.e. only
1056 when the exception is actually thrown, so as not to
1057 waste space for exception clauses which might never
1059 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1060 catch_class = mono_class_from_mono_type (inflated_type);
1061 mono_metadata_free_type (inflated_type);
1067 * mini_jit_info_table_find:
1069 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1070 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1071 * OUT_DOMAIN if it is not NULL.
1074 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1077 MonoInternalThread *t = mono_thread_internal_current ();
1083 ji = mono_jit_info_table_find (domain, addr);
1086 *out_domain = domain;
1090 /* maybe it is shared code, so we also search in the root domain */
1091 if (domain != mono_get_root_domain ()) {
1092 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1095 *out_domain = mono_get_root_domain ();
1100 for (l = t->appdomain_refs; l; l = l->next) {
1101 if (l->data != domain) {
1102 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1105 *out_domain = (MonoDomain*)l->data;
1115 * mono_handle_exception_internal:
1116 * @ctx: saved processor state
1117 * @obj: the exception object
1118 * @test_only: only test if the exception is caught, but dont call handlers
1119 * @out_filter_idx: out parameter. if test_only is true, set to the index of
1120 * the first filter clause which caught the exception.
1121 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1124 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gboolean resume, gint32 *out_filter_idx, MonoJitInfo **out_ji)
1126 MonoDomain *domain = mono_domain_get ();
1127 MonoJitInfo *ji, rji;
1128 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1129 static void (*restore_context) (void *);
1130 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1131 MonoLMF *lmf = mono_get_lmf ();
1132 MonoArray *initial_trace_ips = NULL;
1133 GList *trace_ips = NULL;
1134 MonoException *mono_ex;
1135 gboolean stack_overflow = FALSE;
1136 MonoContext initial_ctx;
1137 int frame_count = 0;
1138 gboolean has_dynamic_methods = FALSE;
1139 gint32 filter_idx, first_filter_idx;
1142 g_assert (ctx != NULL);
1144 MonoException *ex = mono_get_exception_null_reference ();
1145 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1146 obj = (MonoObject *)ex;
1150 * Allocate a new exception object instead of the preconstructed ones.
1152 if (obj == domain->stack_overflow_ex) {
1154 * It is not a good idea to try and put even more pressure on the little stack available.
1155 * obj = mono_get_exception_stack_overflow ();
1157 stack_overflow = TRUE;
1159 else if (obj == domain->null_reference_ex) {
1160 obj = mono_get_exception_null_reference ();
1163 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1164 mono_ex = (MonoException*)obj;
1165 initial_trace_ips = mono_ex->trace_ips;
1170 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1171 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1172 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1173 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1174 mono_ex->message = mono_string_new (domain, msg);
1181 call_filter = mono_get_call_filter ();
1183 if (!restore_context)
1184 restore_context = mono_get_restore_context ();
1186 g_assert (jit_tls->end_of_stack);
1187 g_assert (jit_tls->abort_func);
1189 if (!test_only && !resume) {
1190 MonoContext ctx_cp = *ctx;
1191 if (mono_trace_is_enabled ()) {
1192 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1193 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1194 MonoObject *message;
1195 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1197 MonoObject *exc = NULL;
1198 if (get_message == NULL) {
1200 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1202 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1204 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1208 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1210 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1212 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1213 mono_print_thread_dump_from_ctx (ctx);
1215 mono_profiler_exception_thrown (obj);
1216 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, FALSE, &first_filter_idx, out_ji)) {
1217 if (mono_break_on_exc)
1219 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1220 // FIXME: This runs managed code so it might cause another stack overflow when
1221 // we are handling a stack overflow
1222 mono_unhandled_exception (obj);
1224 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1229 *out_filter_idx = -1;
1234 memset (&rji, 0, sizeof (rji));
1237 MonoContext new_ctx;
1239 int clause_index_start = 0;
1243 ji = jit_tls->resume_state.ji;
1244 new_ctx = jit_tls->resume_state.new_ctx;
1245 clause_index_start = jit_tls->resume_state.clause_index;
1246 lmf = jit_tls->resume_state.lmf;
1247 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1248 filter_idx = jit_tls->resume_state.filter_idx;
1250 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1251 NULL, &lmf, NULL, NULL);
1253 g_warning ("Exception inside function without unwind info");
1254 g_assert_not_reached ();
1258 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))))) {
1260 * The exception was raised in native code and we got back to managed code
1267 if (ji != (gpointer)-1) {
1269 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
1271 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1272 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1273 "The native frame called the managed method:\n%s\n",
1274 mono_method_full_name (ji->method, TRUE));
1277 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1279 * Avoid overwriting the stack trace if the exception is
1280 * rethrown. Also avoid giant stack traces during a stack
1283 if (!initial_trace_ips && (frame_count < 1000)) {
1284 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1285 trace_ips = g_list_prepend (trace_ips,
1286 get_generic_info_from_stack_frame (ji, ctx));
1290 if (ji->method->dynamic)
1291 has_dynamic_methods = TRUE;
1294 #ifndef MONO_ARCH_STACK_GROWS_UP
1295 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1297 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1300 free_stack = 0xffffff;
1303 * During stack overflow, wait till the unwinding frees some stack
1304 * space before running handlers/finalizers.
1306 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1309 for (i = clause_index_start; i < ji->num_clauses; i++) {
1310 MonoJitExceptionInfo *ei = &ji->clauses [i];
1311 gboolean filtered = FALSE;
1313 #if defined(__s390__)
1315 * This is required in cases where a try block starts immediately after
1316 * a call which causes an exception. Testcase: tests/exception8.cs.
1317 * FIXME: Clean this up.
1319 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) && MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1321 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1324 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1326 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1327 if (ji->from_llvm) {
1328 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1329 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, obj);
1331 g_assert_not_reached ();
1334 /* store the exception object in bp + ei->exvar_offset */
1335 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1339 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1341 mono_perfcounters->exceptions_filters++;
1342 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1343 filtered = call_filter (ctx, ei->data.filter);
1344 if (filtered && out_filter_idx)
1345 *out_filter_idx = filter_idx;
1351 * Filter clauses should only be run in the
1352 * first pass of exception handling.
1354 filtered = (filter_idx == first_filter_idx);
1359 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1360 mono_object_isinst (obj, catch_class)) || filtered) {
1362 if (mono_ex && !initial_trace_ips) {
1363 trace_ips = g_list_reverse (trace_ips);
1364 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1365 if (has_dynamic_methods)
1366 /* These methods could go away anytime, so compute the stack trace now */
1367 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1369 g_list_free (trace_ips);
1374 * This guards against the situation that we abort a thread that is executing a finally clause
1375 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1376 * check for this situation here and resume interruption if we are below the guarded block.
1378 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1379 gboolean is_outside = FALSE;
1380 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->ex_ctx);
1381 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1382 //FIXME make this stack direction aware
1383 if (catch_bp > prot_bp) {
1385 } else if (catch_bp == prot_bp) {
1386 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1387 * So we check if the catch handler_start is protected by the guarded handler protected region
1390 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1391 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1392 * There aren't any further finally/fault handler blocks down the stack over this exception.
1393 * This must be ensured by the code that installs the guard trampoline.
1395 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->ex_ctx), NULL));
1397 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1402 jit_tls->handler_block_return_address = NULL;
1403 jit_tls->handler_block = NULL;
1404 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1408 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1409 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1410 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1411 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1412 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1413 *(mono_get_lmf_addr ()) = lmf;
1414 mono_perfcounters->exceptions_depth += frame_count;
1415 if (obj == domain->stack_overflow_ex)
1416 jit_tls->handling_stack_ovf = FALSE;
1420 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1421 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1422 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1423 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1424 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1425 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1426 call_filter (ctx, ei->handler_start);
1428 if (!test_only && is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1429 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1430 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1431 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1432 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1433 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1434 mono_perfcounters->exceptions_finallys++;
1435 *(mono_get_lmf_addr ()) = lmf;
1436 if (ji->from_llvm) {
1438 * LLVM compiled finally handlers follow the design
1439 * of the c++ ehabi, i.e. they call a resume function
1440 * at the end instead of returning to the caller.
1441 * So save the exception handling state,
1442 * mono_resume_unwind () will call us again to continue
1445 jit_tls->resume_state.ex_obj = obj;
1446 jit_tls->resume_state.ji = ji;
1447 jit_tls->resume_state.clause_index = i + 1;
1448 jit_tls->resume_state.ctx = *ctx;
1449 jit_tls->resume_state.new_ctx = new_ctx;
1450 jit_tls->resume_state.lmf = lmf;
1451 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1452 jit_tls->resume_state.filter_idx = filter_idx;
1453 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1456 call_filter (ctx, ei->handler_start);
1464 mono_profiler_exception_method_leave (ji->method);
1469 if (ji == (gpointer)-1) {
1472 *(mono_get_lmf_addr ()) = lmf;
1474 jit_tls->abort_func (obj);
1475 g_assert_not_reached ();
1477 if (mono_ex && !initial_trace_ips) {
1478 trace_ips = g_list_reverse (trace_ips);
1479 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1480 if (has_dynamic_methods)
1481 /* These methods could go away anytime, so compute the stack trace now */
1482 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1484 g_list_free (trace_ips);
1490 g_assert_not_reached ();
1494 * mono_debugger_handle_exception:
1496 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1497 * at the exception and FALSE to resume with the normal exception handling.
1499 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1500 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1501 * `callq throw' instruction.
1504 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1506 MonoDebuggerExceptionAction action;
1508 if (!mono_debug_using_mono_debugger ())
1512 MonoException *ex = mono_get_exception_null_reference ();
1513 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1514 obj = (MonoObject *)ex;
1517 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1519 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1521 * The debugger wants us to stop on the `throw' instruction.
1522 * By the time we get here, it already inserted a breakpoint there.
1525 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1526 MonoContext ctx_cp = *ctx;
1527 MonoJitInfo *ji = NULL;
1531 * The debugger wants us to stop only if this exception is user-unhandled.
1534 ret = mono_handle_exception_internal (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), TRUE, FALSE, NULL, &ji);
1535 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1537 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1538 * inside the method being invoked, so we handle it like a user-unhandled exception.
1545 * The exception is user-unhandled - tell the debugger to stop.
1547 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1551 * The exception is catched somewhere - resume with the normal exception handling and don't
1552 * stop in the debugger.
1560 * mono_debugger_run_finally:
1561 * @start_ctx: saved processor state
1563 * This method is called by the Mono Debugger to call all `finally' clauses of the
1564 * current stack frame. It's used when the user issues a `return' command to make
1565 * the current stack frame return. After returning from this method, the debugger
1566 * unwinds the stack one frame and gives control back to the user.
1568 * NOTE: This method is only used when running inside the Mono Debugger.
1571 mono_debugger_run_finally (MonoContext *start_ctx)
1573 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1574 MonoDomain *domain = mono_domain_get ();
1575 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1576 MonoLMF *lmf = mono_get_lmf ();
1577 MonoContext ctx, new_ctx;
1578 MonoJitInfo *ji, rji;
1583 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1584 if (!ji || ji == (gpointer)-1)
1588 call_filter = mono_get_call_filter ();
1590 for (i = 0; i < ji->num_clauses; i++) {
1591 MonoJitExceptionInfo *ei = &ji->clauses [i];
1593 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1594 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1595 call_filter (&ctx, ei->handler_start);
1601 * mono_handle_exception:
1602 * @ctx: saved processor state
1603 * @obj: the exception object
1604 * @test_only: only test if the exception is caught, but dont call handlers
1607 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1610 mono_perfcounters->exceptions_thrown++;
1612 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, FALSE, NULL, NULL);
1615 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1617 #ifndef MONO_ARCH_USE_SIGACTION
1618 #error "Can't use sigaltstack without sigaction"
1621 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1624 mono_setup_altstack (MonoJitTlsData *tls)
1627 struct sigaltstack sa;
1628 guint8 *staddr = NULL;
1630 if (mono_running_on_valgrind ())
1633 mono_thread_get_stack_bounds (&staddr, &stsize);
1637 tls->end_of_stack = staddr + stsize;
1639 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1641 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1642 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1644 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1645 /* mprotect can fail for the main thread stack */
1646 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);
1647 g_assert (gaddr == tls->stack_ovf_guard_base);
1648 tls->stack_ovf_valloced = TRUE;
1652 * threads created by nptl does not seem to have a guard page, and
1653 * since the main thread is not created by us, we can't even set one.
1654 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1655 * is a stack overflow exception.
1657 tls->stack_size = stsize + mono_pagesize ();
1659 /* Setup an alternate signal stack */
1660 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1661 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1663 g_assert (tls->signal_stack);
1665 sa.ss_sp = tls->signal_stack;
1666 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1667 sa.ss_flags = SS_ONSTACK;
1668 sigaltstack (&sa, NULL);
1672 mono_free_altstack (MonoJitTlsData *tls)
1674 struct sigaltstack sa;
1677 sa.ss_sp = tls->signal_stack;
1678 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1679 sa.ss_flags = SS_DISABLE;
1680 err = sigaltstack (&sa, NULL);
1681 g_assert (err == 0);
1683 if (tls->signal_stack)
1684 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1685 if (tls->stack_ovf_valloced)
1686 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1688 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1691 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1694 mono_setup_altstack (MonoJitTlsData *tls)
1699 mono_free_altstack (MonoJitTlsData *tls)
1703 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1706 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1708 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1709 /* we need to leave some room for throwing the exception */
1710 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1711 unprotect_size -= mono_pagesize ();
1712 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1713 * is sufficient stack
1715 //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);
1717 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1718 return unprotect_size == jit_tls->stack_ovf_guard_size;
1722 try_more_restore (void)
1724 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1725 if (try_restore_stack_protection (jit_tls, 500))
1726 jit_tls->restore_stack_prot = NULL;
1730 restore_stack_protection (void)
1732 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1733 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1734 /* if we can't restore the stack protection, keep a callback installed so
1735 * we'll try to restore as much stack as we can at each return from unmanaged
1738 if (try_restore_stack_protection (jit_tls, 4096))
1739 jit_tls->restore_stack_prot = NULL;
1741 jit_tls->restore_stack_prot = try_more_restore_tramp;
1742 /* here we also throw a stack overflow exception */
1743 ex->trace_ips = NULL;
1744 ex->stack_trace = NULL;
1745 mono_raise_exception (ex);
1749 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1751 void (*func)(void) = (gpointer)tramp_data;
1757 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1759 /* we got a stack overflow in the soft-guard pages
1760 * There are two cases:
1761 * 1) managed code caused the overflow: we unprotect the soft-guard page
1762 * and let the arch-specific code trigger the exception handling mechanism
1763 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1764 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1765 * and hope we can continue with those enabled, at least until the hard-guard page
1766 * is hit. The alternative to continuing here is to just print a message and abort.
1767 * We may add in the future the code to protect the pages again in the codepath
1768 * when we return from unmanaged to managed code.
1770 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1771 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1772 /* we unprotect the minimum amount we can */
1774 gboolean handled = FALSE;
1776 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1777 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1778 guard_size -= mono_pagesize ();
1780 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1781 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1782 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);
1783 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1785 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1790 /* We print a message: after this even managed stack overflows
1791 * may crash the runtime
1793 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1794 if (!jit_tls->handling_stack_ovf) {
1795 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1796 jit_tls->handling_stack_ovf = 1;
1798 /*fprintf (stderr, "Already handling stack overflow\n");*/
1807 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1809 FILE *stream = (FILE*)data;
1812 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1813 fprintf (stream, " %s\n", location);
1816 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1821 static G_GNUC_UNUSED gboolean
1822 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1825 GString *p = (GString*)data;
1828 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1829 g_string_append_printf (p, " %s\n", location);
1832 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1837 static gboolean handling_sigsegv = FALSE;
1840 * mono_handle_native_sigsegv:
1842 * Handle a SIGSEGV received while in native code by printing diagnostic
1843 * information and aborting.
1846 mono_handle_native_sigsegv (int signal, void *ctx)
1848 #ifdef MONO_ARCH_USE_SIGACTION
1849 struct sigaction sa;
1851 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1853 if (handling_sigsegv)
1856 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1857 fprintf (stderr, "Received SIGSEGV, suspending...");
1862 /* To prevent infinite loops when the stack walk causes a crash */
1863 handling_sigsegv = TRUE;
1865 /* !jit_tls means the thread was not registered with the runtime */
1866 if (jit_tls && mono_thread_internal_current ()) {
1867 fprintf (stderr, "Stacktrace:\n\n");
1869 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1874 #ifdef HAVE_BACKTRACE_SYMBOLS
1879 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1881 fprintf (stderr, "\nNative stacktrace:\n\n");
1883 size = backtrace (array, 256);
1884 names = backtrace_symbols (array, size);
1885 for (i =0; i < size; ++i) {
1886 fprintf (stderr, "\t%s\n", names [i]);
1892 /* Try to get more meaningful information using gdb */
1894 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1895 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1896 /* From g_spawn_command_line_sync () in eglib */
1898 int stdout_pipe [2] = { -1, -1 };
1903 res = pipe (stdout_pipe);
1904 g_assert (res != -1);
1908 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1909 * it will deadlock. Call the syscall directly instead.
1911 pid = mono_runtime_syscall_fork ();
1914 close (stdout_pipe [0]);
1915 dup2 (stdout_pipe [1], STDOUT_FILENO);
1917 for (i = getdtablesize () - 1; i >= 3; i--)
1920 if (!mono_gdb_render_native_backtraces ())
1921 close (STDOUT_FILENO);
1926 close (stdout_pipe [1]);
1928 fprintf (stderr, "\nDebug info from gdb:\n\n");
1931 int nread = read (stdout_pipe [0], buffer, 1024);
1935 write (STDERR_FILENO, buffer, nread);
1938 waitpid (pid, &status, WNOHANG);
1942 * A SIGSEGV indicates something went very wrong so we can no longer depend
1943 * on anything working. So try to print out lots of diagnostics, starting
1944 * with ones which have a greater chance of working.
1948 "=================================================================\n"
1949 "Got a %s while executing native code. This usually indicates\n"
1950 "a fatal error in the mono runtime or one of the native libraries \n"
1951 "used by your application.\n"
1952 "=================================================================\n"
1958 #ifdef MONO_ARCH_USE_SIGACTION
1960 /* Remove our SIGABRT handler */
1961 sa.sa_handler = SIG_DFL;
1962 sigemptyset (&sa.sa_mask);
1965 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1973 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
1975 MonoInternalThread *thread = mono_thread_internal_current ();
1976 #if defined(__i386__) || defined(__x86_64__)
1979 GString* text = g_string_new (0);
1980 char *name, *wapi_desc;
1981 GError *error = NULL;
1984 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1986 g_string_append_printf (text, "\n\"%s\"", name);
1989 else if (thread->threadpool_thread)
1990 g_string_append (text, "\n\"<threadpool thread>\"");
1992 g_string_append (text, "\n\"<unnamed thread>\"");
1995 wapi_desc = wapi_current_thread_desc ();
1996 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2000 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2002 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2004 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2006 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2008 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
2010 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
2013 fprintf (stdout, "%s", text->str);
2014 g_string_free (text, TRUE);
2019 * mono_print_thread_dump:
2021 * Print information about the current thread to stdout.
2022 * SIGCTX can be NULL, allowing this to be called from gdb.
2025 mono_print_thread_dump (void *sigctx)
2027 mono_print_thread_dump_internal (sigctx, NULL);
2031 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2033 mono_print_thread_dump_internal (NULL, ctx);
2037 * mono_resume_unwind:
2039 * This is called by a trampoline from LLVM compiled finally clauses to continue
2043 mono_resume_unwind (MonoContext *ctx)
2045 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2046 static void (*restore_context) (MonoContext *);
2047 MonoContext new_ctx;
2049 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2050 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2053 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, NULL, FALSE, TRUE, NULL, NULL);
2055 if (!restore_context)
2056 restore_context = mono_get_restore_context ();
2058 restore_context (&new_ctx);
2061 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2066 MonoJitExceptionInfo *ei;
2067 } FindHandlerBlockData;
2070 find_last_handler_block (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
2074 FindHandlerBlockData *pdata = data;
2076 if (ji->method->wrapper_type)
2079 ip = MONO_CONTEXT_GET_IP (ctx);
2081 for (i = 0; i < ji->num_clauses; ++i) {
2082 MonoJitExceptionInfo *ei = ji->clauses + i;
2083 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2085 /*If ip points to the first instruction it means the handler block didn't start
2086 so we can leave its execution to the EH machinery*/
2087 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2099 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2102 MonoJitExceptionInfo *clause = NULL;
2105 ip = MONO_CONTEXT_GET_IP (ctx);
2107 for (i = 0; i < ji->num_clauses; ++i) {
2108 clause = &ji->clauses [i];
2109 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2111 if (clause->handler_start < ip && clause->data.handler_end > ip)
2115 /*no matching finally */
2116 if (i == ji->num_clauses)
2119 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2120 if (ip == clause->handler_start)
2123 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2127 * Finds the bottom handler block running and install a block guard if needed.
2130 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)
2132 FindHandlerBlockData data = { 0 };
2133 MonoDomain *domain = mono_domain_get ();
2134 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
2137 if (!jit_tls || jit_tls->handler_block_return_address)
2140 mono_walk_stack_full (domain, jit_tls, ctx, find_last_handler_block, FALSE, &data);
2145 memcpy (&jit_tls->ex_ctx, &data.ctx, sizeof (MonoContext));
2147 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2148 if (resume_ip == NULL)
2151 jit_tls->handler_block_return_address = resume_ip;
2152 jit_tls->handler_block = data.ei;
2155 /*Clear current thread from been wapi interrupted otherwise things can go south*/
2156 wapi_clear_interruption ();
2163 mono_install_handler_block_guard (MonoInternalThread *thread, MonoContext *ctx)