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);
68 mono_exceptions_init (void)
70 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
75 restore_context_func = mono_aot_get_named_code ("restore_context");
76 call_filter_func = mono_aot_get_named_code ("call_filter");
77 throw_exception_func = mono_aot_get_named_code ("throw_exception");
78 rethrow_exception_func = mono_aot_get_named_code ("rethrow_exception");
80 restore_context_func = mono_arch_get_restore_context_full (&code_size, &ji, FALSE);
81 call_filter_func = mono_arch_get_call_filter_full (&code_size, &ji, FALSE);
82 throw_exception_func = mono_arch_get_throw_exception_full (&code_size, &ji, FALSE);
83 rethrow_exception_func = mono_arch_get_rethrow_exception_full (&code_size, &ji, FALSE);
86 restore_context_func = mono_arch_get_restore_context ();
87 call_filter_func = mono_arch_get_call_filter ();
88 throw_exception_func = mono_arch_get_throw_exception ();
89 rethrow_exception_func = mono_arch_get_rethrow_exception ();
91 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
92 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
93 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
96 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
97 mono_arch_exceptions_init ();
102 mono_get_throw_exception (void)
104 g_assert (throw_exception_func);
105 return throw_exception_func;
109 mono_get_rethrow_exception (void)
111 g_assert (rethrow_exception_func);
112 return rethrow_exception_func;
116 mono_get_call_filter (void)
118 g_assert (call_filter_func);
119 return call_filter_func;
123 mono_get_restore_context (void)
125 g_assert (restore_context_func);
126 return restore_context_func;
130 mono_get_throw_exception_by_name (void)
132 #ifdef MONO_ARCH_HAVE_THROW_EXCEPTION_BY_NAME
134 gpointer code = NULL;
135 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
140 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
141 if (throw_exception_by_name_func)
142 return throw_exception_by_name_func;
144 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
146 code = mono_aot_get_named_code ("throw_exception_by_name");
148 code = mono_arch_get_throw_exception_by_name_full (&code_size, &ji, FALSE);
150 code = mono_arch_get_throw_exception_by_name ();
153 mono_memory_barrier ();
155 throw_exception_by_name_func = code;
159 throw_exception_by_name_func = NULL;
161 g_assert_not_reached ();
164 return throw_exception_by_name_func;
168 mono_get_throw_corlib_exception (void)
170 gpointer code = NULL;
171 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
176 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
177 if (throw_corlib_exception_func)
178 return throw_corlib_exception_func;
180 #if MONO_ARCH_HAVE_THROW_CORLIB_EXCEPTION
181 #ifdef MONO_ARCH_HAVE_FULL_AOT_TRAMPOLINES
183 code = mono_aot_get_named_code ("throw_corlib_exception");
185 code = mono_arch_get_throw_corlib_exception_full (&code_size, &ji, FALSE);
187 code = mono_arch_get_throw_corlib_exception ();
190 g_assert_not_reached ();
193 mono_memory_barrier ();
195 throw_corlib_exception_func = code;
197 return throw_corlib_exception_func;
200 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
203 * find_jit_info_no_ext:
205 * If the target has the find_jit_info_ext version of this function, define the old
206 * version here which translates between the old and new APIs.
209 find_jit_info_no_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
210 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
212 StackFrameInfo frame;
215 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
217 /* Avoid costly table lookup during stack overflow */
218 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
221 ji = mini_jit_info_table_find (domain, ip, NULL);
226 err = mono_arch_find_jit_info_ext (domain, jit_tls, ji, ctx, new_ctx, lmf, &frame);
230 /* Convert between the new and the old APIs */
231 switch (frame.type) {
232 case FRAME_TYPE_MANAGED:
236 case FRAME_TYPE_MANAGED_TO_NATIVE:
240 memset (res, 0, sizeof (MonoJitInfo));
241 res->method = frame.method;
244 case FRAME_TYPE_DEBUGGER_INVOKE: {
248 * The normal exception handling code can't handle this frame, so just
251 ji = find_jit_info_no_ext (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
252 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
256 g_assert_not_reached ();
263 /* mono_find_jit_info:
265 * This function is used to gather information from @ctx. It return the
266 * MonoJitInfo of the corresponding function, unwinds one stack frame and
267 * stores the resulting context into @new_ctx. It also stores a string
268 * describing the stack location into @trace (if not NULL), and modifies
269 * the @lmf if necessary. @native_offset return the IP offset from the
270 * start of the function or -1 if that info is not available.
273 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
274 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
278 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
290 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
291 ji = find_jit_info_no_ext (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
293 ji = mono_arch_find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
296 if (ji == (gpointer)-1)
299 if (managed2 || (ji && ji->method->wrapper_type)) {
300 const char *real_ip, *start;
303 start = (const char *)ji->code_start;
305 /* ctx->ip points into native code */
306 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
308 real_ip = (const char*)ip;
310 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
311 offset = real_ip - start;
316 *native_offset = offset;
319 if (!ji->method->wrapper_type)
323 *trace = mono_debug_print_stack_frame (ji->method, offset, domain);
326 char *fname = mono_method_full_name (res->method, TRUE);
327 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
335 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
338 * mono_find_jit_info_ext:
340 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
344 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
345 MonoJitInfo *prev_ji, MonoContext *ctx,
346 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
347 StackFrameInfo *frame)
350 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
352 MonoDomain *target_domain;
357 /* Avoid costly table lookup during stack overflow */
358 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
361 ji = mini_jit_info_table_find (domain, ip, &target_domain);
364 target_domain = domain;
366 err = mono_arch_find_jit_info_ext (target_domain, jit_tls, ji, ctx, new_ctx, lmf, frame);
370 frame->native_offset = -1;
371 frame->domain = target_domain;
375 if (ji && (frame->managed || ji->method->wrapper_type)) {
376 const char *real_ip, *start;
378 start = (const char *)ji->code_start;
380 /* ctx->ip points into native code */
381 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
383 real_ip = (const char*)ip;
385 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
386 frame->native_offset = real_ip - start;
388 frame->native_offset = -1;
391 *trace = mono_debug_print_stack_frame (ji->method, frame->native_offset, domain);
393 if (trace && frame->method) {
394 char *fname = mono_method_full_name (frame->method, TRUE);
395 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
403 #endif /* MONO_ARCH_HAVE_FIND_JIT_INFO_EXT */
406 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
408 MonoGenericJitInfo *gi;
411 if (!ji->has_generic_jit_info)
413 gi = mono_jit_info_get_generic_jit_info (ji);
418 info = mono_arch_context_get_int_reg (ctx, gi->this_reg);
420 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
422 if (mono_method_get_context (ji->method)->method_inst) {
424 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
427 /* Avoid returning a managed object */
428 MonoObject *this_obj = info;
430 return this_obj->vtable->klass;
434 static MonoGenericContext
435 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
437 MonoGenericContext context = { NULL, NULL };
438 MonoClass *class, *method_container_class;
440 g_assert (generic_info);
442 g_assert (ji->method->is_inflated);
443 if (mono_method_get_context (ji->method)->method_inst) {
444 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
446 class = mrgctx->class_vtable->klass;
447 context.method_inst = mrgctx->method_inst;
448 g_assert (context.method_inst);
449 } else if ((ji->method->flags & METHOD_ATTRIBUTE_STATIC) || ji->method->klass->valuetype) {
450 MonoVTable *vtable = generic_info;
452 class = vtable->klass;
454 class = generic_info;
457 g_assert (!ji->method->klass->generic_container);
458 if (ji->method->klass->generic_class)
459 method_container_class = ji->method->klass->generic_class->container_class;
461 method_container_class = ji->method->klass;
463 /* class might refer to a subclass of ji->method's class */
464 while (class->generic_class && class->generic_class->container_class != method_container_class) {
465 class = class->parent;
469 if (class->generic_class || class->generic_container)
470 context.class_inst = mini_class_get_context (class)->class_inst;
472 if (class->generic_class)
473 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
475 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
481 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
483 MonoGenericContext context;
486 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
488 context = get_generic_context_from_stack_frame (ji, generic_info);
490 method = mono_method_get_declaring_generic_method (ji->method);
491 method = mono_class_inflate_generic_method (method, &context);
497 ves_icall_System_Exception_get_trace (MonoException *ex)
499 MonoDomain *domain = mono_domain_get ();
501 MonoArray *ta = ex->trace_ips;
506 /* Exception is not thrown yet */
509 len = mono_array_length (ta) >> 1;
510 trace_str = g_string_new ("");
511 for (i = 0; i < len; i++) {
513 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
514 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
516 ji = mono_jit_info_table_find (domain, ip);
518 /* Unmanaged frame */
519 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
523 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
525 address = (char *)ip - (char *)ji->code_start;
526 location = mono_debug_print_stack_frame (
527 method, address, ex->object.vtable->domain);
529 g_string_append_printf (trace_str, "%s\n", location);
534 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
535 g_string_free (trace_str, TRUE);
541 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
543 MonoDomain *domain = mono_domain_get ();
545 MonoArray *ta = exc->trace_ips;
546 MonoDebugSourceLocation *location;
550 /* Exception is not thrown yet */
551 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
554 len = mono_array_length (ta) >> 1;
556 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
558 for (i = skip; i < len; i++) {
560 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
561 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
562 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
565 ji = mono_jit_info_table_find (domain, ip);
567 /* Unmanaged frame */
568 mono_array_setref (res, i, sf);
572 g_assert (ji != NULL);
574 method = get_method_from_stack_frame (ji, generic_info);
575 if (ji->method->wrapper_type) {
579 s = mono_method_full_name (method, TRUE);
580 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
584 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
585 sf->native_offset = (char *)ip - (char *)ji->code_start;
588 * mono_debug_lookup_source_location() returns both the file / line number information
589 * and the IL offset. Note that computing the IL offset is already an expensive
590 * operation, so we shouldn't call this method twice.
592 location = mono_debug_lookup_source_location (ji->method, sf->native_offset, domain);
594 sf->il_offset = location->il_offset;
598 if (need_file_info) {
599 if (location && location->source_file) {
600 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
601 sf->line = location->row;
602 sf->column = location->column;
604 sf->line = sf->column = 0;
609 mono_debug_free_source_location (location);
610 mono_array_setref (res, i, sf);
618 * @domain: starting appdomain
619 * @jit_tls: JIT data for the thread
620 * @start_ctx: starting state of the stack frame
621 * @func: callback to call for each stack frame
622 * @user_data: data passed to the callback
624 * This function walks the stack of a thread, starting from the state
625 * represented by jit_tls and start_ctx. For each frame the callback
626 * function is called with the relevant info. The walk ends when no more
627 * managed stack frames are found or when the callback returns a TRUE value.
628 * Note that the function can be used to walk the stack of a thread
629 * different from the current.
632 mono_walk_stack (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoContext *start_ctx, MonoStackFrameWalk func, gpointer user_data)
634 MonoLMF *lmf = mono_get_lmf ();
635 MonoJitInfo *ji, rji;
638 MonoContext ctx, new_ctx;
642 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
644 * FIXME: mono_find_jit_info () will need to be able to return a different
645 * MonoDomain when apddomain transitions are found on the stack.
647 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
648 if (!ji || ji == (gpointer)-1)
651 if (func (domain, &new_ctx, ji, user_data))
659 mono_jit_walk_stack_from_ctx (MonoStackWalk func, MonoContext *start_ctx, gboolean do_il_offset, gpointer user_data)
661 MonoDomain *domain = mono_domain_get ();
662 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
663 MonoLMF *lmf = mono_get_lmf ();
664 MonoJitInfo *ji, rji;
665 gint native_offset, il_offset;
667 MonoContext ctx, new_ctx;
669 MONO_ARCH_CONTEXT_DEF
671 mono_arch_flush_register_windows ();
674 memcpy (&ctx, start_ctx, sizeof (MonoContext));
676 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
677 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
679 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
683 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
684 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
687 if (ji == (gpointer)-1)
691 MonoDebugSourceLocation *source;
693 source = mono_debug_lookup_source_location (ji->method, native_offset, domain);
694 il_offset = source ? source->il_offset : -1;
695 mono_debug_free_source_location (source);
699 if (func (ji->method, native_offset, il_offset, managed, user_data))
707 mono_jit_walk_stack (MonoStackWalk func, gboolean do_il_offset, gpointer user_data)
709 mono_jit_walk_stack_from_ctx (func, NULL, do_il_offset, user_data);
713 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)
715 MonoJitTlsData *jit_tls = thread->jit_data;
717 MonoContext ctx, new_ctx;
718 StackFrameInfo frame;
719 #ifndef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
722 MonoJitInfo *ji, rji;
727 MONO_ARCH_CONTEXT_DEF
729 mono_arch_flush_register_windows ();
732 memcpy (&ctx, start_ctx, sizeof (MonoContext));
734 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
735 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
737 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_jit_walk_stack_from_ctx);
739 g_assert (thread == mono_thread_internal_current ());
742 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
744 #ifdef MONO_ARCH_HAVE_FIND_JIT_INFO_EXT
745 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, &frame);
749 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, &native_offset, &managed);
751 frame.type = FRAME_TYPE_MANAGED;
753 frame.managed = managed;
754 frame.native_offset = native_offset;
756 if (ji == (gpointer)-1)
760 if (do_il_offset && frame.ji) {
761 MonoDebugSourceLocation *source;
763 source = mono_debug_lookup_source_location (frame.ji->method, frame.native_offset, domain);
764 il_offset = source ? source->il_offset : -1;
765 mono_debug_free_source_location (source);
769 frame.il_offset = il_offset;
771 if (func (&frame, &ctx, user_data))
780 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
781 MonoReflectionMethod **method,
782 gint32 *iloffset, gint32 *native_offset,
783 MonoString **file, gint32 *line, gint32 *column)
785 MonoDomain *domain = mono_domain_get ();
786 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
787 MonoLMF *lmf = mono_get_lmf ();
788 MonoJitInfo *ji, rji;
789 MonoContext ctx, new_ctx, ji_ctx;
790 MonoDebugSourceLocation *location;
791 MonoMethod *last_method = NULL, *actual_method;
793 MONO_ARCH_CONTEXT_DEF;
795 mono_arch_flush_register_windows ();
797 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
798 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
800 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
805 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, (int*) native_offset, NULL);
808 if (ji && ji != (gpointer)-1 &&
809 MONO_CONTEXT_GET_IP (&ctx) >= ji->code_start &&
810 (guint8*)MONO_CONTEXT_GET_IP (&ctx) < (guint8*)ji->code_start + ji->code_size) {
814 if (!ji || ji == (gpointer)-1 || MONO_CONTEXT_GET_SP (&ctx) >= jit_tls->end_of_stack)
817 /* skip all wrappers ??*/
818 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
819 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
820 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
821 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
822 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE ||
823 ji->method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED)
826 if (ji->method->wrapper_type == MONO_WRAPPER_MANAGED_TO_NATIVE && ji->method == last_method) {
828 * FIXME: Native-to-managed wrappers sometimes show up twice.
829 * Probably the whole mono_find_jit_info () stuff needs to be fixed so this
835 last_method = ji->method;
841 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ji_ctx));
843 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
845 location = mono_debug_lookup_source_location (ji->method, *native_offset, domain);
847 *iloffset = location->il_offset;
851 if (need_file_info) {
853 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
854 *line = location->row;
855 *column = location->column;
862 mono_debug_free_source_location (location);
869 MonoSecurityFrame *frame;
870 } MonoFrameSecurityInfo;
873 callback_get_first_frame_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
875 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
877 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
878 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
879 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
880 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
881 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
882 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
891 si->frame = mono_declsec_create_frame (domain, ji);
893 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
898 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
899 * @skip: the number of stack frames to skip
901 * This function returns a the security informations of a single stack frame
902 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
903 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
907 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
909 MonoDomain *domain = mono_domain_get ();
910 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
911 MonoFrameSecurityInfo si;
914 MONO_ARCH_CONTEXT_DEF
916 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
917 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
919 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityFrame);
922 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
928 mono_walk_stack (domain, jit_tls, &ctx, callback_get_first_frame_security_info, (gpointer)&si);
930 return (si.skips == 0) ? si.frame : NULL;
942 grow_array (MonoSecurityStack *stack)
944 MonoDomain *domain = mono_domain_get ();
945 guint32 newsize = (stack->maximum << 1);
946 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
948 for (i=0; i < stack->maximum; i++) {
949 gpointer frame = mono_array_get (stack->stack, gpointer, i);
950 mono_array_setref (newstack, i, frame);
952 stack->maximum = newsize;
953 stack->stack = newstack;
957 callback_get_stack_frames_security_info (MonoDomain *domain, MonoContext *ctx, MonoJitInfo *ji, gpointer data)
959 MonoSecurityStack *ss = (MonoSecurityStack*) data;
961 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
962 if (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
963 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
964 ji->method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
965 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
966 ji->method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
975 if (ss->count == ss->maximum)
978 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (domain, ji));
980 /* continue down the stack */
985 glist_to_array (GList *list, MonoClass *eclass)
987 MonoDomain *domain = mono_domain_get ();
994 len = g_list_length (list);
995 res = mono_array_new (domain, eclass, len);
997 for (i = 0; list; list = list->next, i++)
998 mono_array_set (res, gpointer, i, list->data);
1004 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1005 * @skip: the number of stack frames to skip
1007 * This function returns an managed array of containing the security
1008 * informations for each frame (after the skipped ones). This is used for
1009 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1013 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1015 MonoDomain *domain = mono_domain_get ();
1016 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1017 MonoSecurityStack ss;
1020 MONO_ARCH_CONTEXT_DEF
1022 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1023 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1025 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_System_Security_SecurityFrame_GetSecurityStack);
1028 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1034 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1035 ss.stack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, ss.maximum);
1036 mono_walk_stack (domain, jit_tls, &ctx, callback_get_stack_frames_security_info, (gpointer)&ss);
1037 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1042 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1044 MonoClass *catch_class = ei->data.catch_class;
1045 MonoType *inflated_type;
1046 MonoGenericContext context;
1051 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1053 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1055 /* FIXME: we shouldn't inflate but instead put the
1056 type in the rgctx and fetch it from there. It
1057 might be a good idea to do this lazily, i.e. only
1058 when the exception is actually thrown, so as not to
1059 waste space for exception clauses which might never
1061 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1062 catch_class = mono_class_from_mono_type (inflated_type);
1063 mono_metadata_free_type (inflated_type);
1069 * mini_jit_info_table_find:
1071 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1072 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1073 * OUT_DOMAIN if it is not NULL.
1076 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1079 MonoInternalThread *t = mono_thread_internal_current ();
1085 ji = mono_jit_info_table_find (domain, addr);
1088 *out_domain = domain;
1092 /* maybe it is shared code, so we also search in the root domain */
1093 if (domain != mono_get_root_domain ()) {
1094 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1097 *out_domain = mono_get_root_domain ();
1102 for (l = t->appdomain_refs; l; l = l->next) {
1103 if (l->data != domain) {
1104 ji = mono_jit_info_table_find ((MonoDomain*)l->data, addr);
1107 *out_domain = (MonoDomain*)l->data;
1117 * mono_handle_exception_internal:
1118 * @ctx: saved processor state
1119 * @obj: the exception object
1120 * @test_only: only test if the exception is caught, but dont call handlers
1121 * @out_filter_idx: out parameter. if test_only is true, set to the index of
1122 * the first filter clause which caught the exception.
1123 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1126 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only, gboolean resume, gint32 *out_filter_idx, MonoJitInfo **out_ji)
1128 MonoDomain *domain = mono_domain_get ();
1129 MonoJitInfo *ji, rji;
1130 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1131 static void (*restore_context) (void *);
1132 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1133 MonoLMF *lmf = mono_get_lmf ();
1134 MonoArray *initial_trace_ips = NULL;
1135 GList *trace_ips = NULL;
1136 MonoException *mono_ex;
1137 gboolean stack_overflow = FALSE;
1138 MonoContext initial_ctx;
1139 int frame_count = 0;
1140 gboolean has_dynamic_methods = FALSE;
1141 gint32 filter_idx, first_filter_idx;
1143 g_assert (ctx != NULL);
1145 MonoException *ex = mono_get_exception_null_reference ();
1146 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1147 obj = (MonoObject *)ex;
1151 * Allocate a new exception object instead of the preconstructed ones.
1153 if (obj == domain->stack_overflow_ex) {
1155 * It is not a good idea to try and put even more pressure on the little stack available.
1156 * obj = mono_get_exception_stack_overflow ();
1158 stack_overflow = TRUE;
1160 else if (obj == domain->null_reference_ex) {
1161 obj = mono_get_exception_null_reference ();
1164 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1165 mono_ex = (MonoException*)obj;
1166 initial_trace_ips = mono_ex->trace_ips;
1171 if (mono_ex && jit_tls->class_cast_from && !strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1172 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1173 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1174 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1175 mono_ex->message = mono_string_new (domain, msg);
1182 call_filter = mono_get_call_filter ();
1184 if (!restore_context)
1185 restore_context = mono_get_restore_context ();
1187 g_assert (jit_tls->end_of_stack);
1188 g_assert (jit_tls->abort_func);
1191 MonoContext ctx_cp = *ctx;
1192 if (mono_trace_is_enabled ()) {
1193 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1194 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1195 MonoObject *message;
1196 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1198 MonoObject *exc = NULL;
1199 if (get_message == NULL) {
1201 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1203 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1205 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1209 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1211 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1213 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1214 mono_print_thread_dump_from_ctx (ctx);
1216 mono_profiler_exception_thrown (obj);
1217 if (!mono_handle_exception_internal (&ctx_cp, obj, original_ip, TRUE, FALSE, &first_filter_idx, out_ji)) {
1218 if (mono_break_on_exc)
1220 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1221 // FIXME: This runs managed code so it might cause another stack overflow when
1222 // we are handling a stack overflow
1223 mono_unhandled_exception (obj);
1225 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1230 *out_filter_idx = -1;
1235 memset (&rji, 0, sizeof (rji));
1238 MonoContext new_ctx;
1241 ji = mono_find_jit_info (domain, jit_tls, &rji, &rji, ctx, &new_ctx,
1242 NULL, &lmf, NULL, NULL);
1244 g_warning ("Exception inside function without unwind info");
1245 g_assert_not_reached ();
1248 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))))) {
1250 * The exception was raised in native code and we got back to managed code
1257 if (ji != (gpointer)-1) {
1259 //printf ("M: %s %d %d.\n", mono_method_full_name (ji->method, TRUE), frame_count, test_only);
1261 if (test_only && ji->method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1263 * Avoid overwriting the stack trace if the exception is
1264 * rethrown. Also avoid giant stack traces during a stack
1267 if (!initial_trace_ips && (frame_count < 1000)) {
1268 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1269 trace_ips = g_list_prepend (trace_ips,
1270 get_generic_info_from_stack_frame (ji, ctx));
1274 if (ji->method->dynamic)
1275 has_dynamic_methods = TRUE;
1278 #ifndef MONO_ARCH_STACK_GROWS_UP
1279 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1281 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1284 free_stack = 0xffffff;
1287 * During stack overflow, wait till the unwinding frees some stack
1288 * space before running handlers/finalizers.
1290 if ((free_stack > (64 * 1024)) && ji->num_clauses) {
1293 for (i = 0; i < ji->num_clauses; i++) {
1294 MonoJitExceptionInfo *ei = &ji->clauses [i];
1295 gboolean filtered = FALSE;
1297 #if defined(__s390__)
1299 * This is required in cases where a try block starts immediately after
1300 * a call which causes an exception. Testcase: tests/exception8.cs.
1301 * FIXME: Clean this up.
1303 if (ei->try_start < MONO_CONTEXT_GET_IP (ctx) &&
1305 if (ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1307 MONO_CONTEXT_GET_IP (ctx) <= ei->try_end) {
1309 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1311 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER)) {
1312 if (ji->from_llvm) {
1313 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1314 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, obj);
1316 g_assert_not_reached ();
1319 /* store the exception object in bp + ei->exvar_offset */
1320 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = obj;
1324 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1326 mono_perfcounters->exceptions_filters++;
1327 mono_debugger_call_exception_handler (ei->data.filter, MONO_CONTEXT_GET_SP (ctx), obj);
1328 filtered = call_filter (ctx, ei->data.filter);
1329 if (filtered && out_filter_idx)
1330 *out_filter_idx = filter_idx;
1336 * Filter clauses should only be run in the
1337 * first pass of exception handling.
1339 filtered = (filter_idx == first_filter_idx);
1344 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1345 mono_object_isinst (obj, catch_class)) || filtered) {
1347 if (mono_ex && !initial_trace_ips) {
1348 trace_ips = g_list_reverse (trace_ips);
1349 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1350 if (has_dynamic_methods)
1351 /* These methods could go away anytime, so compute the stack trace now */
1352 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1354 g_list_free (trace_ips);
1358 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1359 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1360 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1361 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1362 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1363 *(mono_get_lmf_addr ()) = lmf;
1364 mono_perfcounters->exceptions_depth += frame_count;
1365 if (obj == domain->stack_overflow_ex)
1366 jit_tls->handling_stack_ovf = FALSE;
1370 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1371 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1372 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1373 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1374 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1375 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1376 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1377 call_filter (ctx, ei->handler_start);
1379 if (!test_only && ei->try_start <= MONO_CONTEXT_GET_IP (ctx) &&
1380 MONO_CONTEXT_GET_IP (ctx) < ei->try_end &&
1381 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1382 if (mono_trace_is_enabled () && mono_trace_eval (ji->method))
1383 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (ji->method, TRUE));
1384 mono_profiler_exception_clause_handler (ji->method, ei->flags, i);
1385 mono_debugger_call_exception_handler (ei->handler_start, MONO_CONTEXT_GET_SP (ctx), obj);
1386 mono_perfcounters->exceptions_finallys++;
1387 *(mono_get_lmf_addr ()) = lmf;
1388 if (ji->from_llvm) {
1390 * LLVM compiled finally handlers follow the design
1391 * of the c++ ehabi, i.e. they call a resume function
1392 * at the end instead of returning to the caller.
1393 * So save the exception handling state,
1394 * mono_resume_unwind () will call us again to continue
1397 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1398 *(mono_get_lmf_addr ()) = lmf;
1399 jit_tls->ex_ctx = new_ctx;
1400 jit_tls->ex_obj = obj;
1403 call_filter (ctx, ei->handler_start);
1411 mono_profiler_exception_method_leave (ji->method);
1416 if (ji == (gpointer)-1) {
1419 *(mono_get_lmf_addr ()) = lmf;
1421 jit_tls->abort_func (obj);
1422 g_assert_not_reached ();
1424 if (mono_ex && !initial_trace_ips) {
1425 trace_ips = g_list_reverse (trace_ips);
1426 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class));
1427 if (has_dynamic_methods)
1428 /* These methods could go away anytime, so compute the stack trace now */
1429 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
1431 g_list_free (trace_ips);
1437 g_assert_not_reached ();
1441 * mono_debugger_handle_exception:
1443 * Notify the debugger about exceptions. Returns TRUE if the debugger wants us to stop
1444 * at the exception and FALSE to resume with the normal exception handling.
1446 * The arch code is responsible to setup @ctx in a way that MONO_CONTEXT_GET_IP () and
1447 * MONO_CONTEXT_GET_SP () point to the throw instruction; ie. before executing the
1448 * `callq throw' instruction.
1451 mono_debugger_handle_exception (MonoContext *ctx, MonoObject *obj)
1453 MonoDebuggerExceptionAction action;
1455 if (!mono_debug_using_mono_debugger ())
1459 MonoException *ex = mono_get_exception_null_reference ();
1460 MONO_OBJECT_SETREF (ex, message, mono_string_new (mono_domain_get (), "Object reference not set to an instance of an object"));
1461 obj = (MonoObject *)ex;
1464 action = _mono_debugger_throw_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1466 if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP) {
1468 * The debugger wants us to stop on the `throw' instruction.
1469 * By the time we get here, it already inserted a breakpoint there.
1472 } else if (action == MONO_DEBUGGER_EXCEPTION_ACTION_STOP_UNHANDLED) {
1473 MonoContext ctx_cp = *ctx;
1474 MonoJitInfo *ji = NULL;
1478 * The debugger wants us to stop only if this exception is user-unhandled.
1481 ret = mono_handle_exception_internal (&ctx_cp, obj, MONO_CONTEXT_GET_IP (ctx), TRUE, FALSE, NULL, &ji);
1482 if (ret && (ji != NULL) && (ji->method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE)) {
1484 * The exception is handled in a runtime-invoke wrapper, that means that it's unhandled
1485 * inside the method being invoked, so we handle it like a user-unhandled exception.
1492 * The exception is user-unhandled - tell the debugger to stop.
1494 return _mono_debugger_unhandled_exception (MONO_CONTEXT_GET_IP (ctx), MONO_CONTEXT_GET_SP (ctx), obj);
1498 * The exception is catched somewhere - resume with the normal exception handling and don't
1499 * stop in the debugger.
1507 * mono_debugger_run_finally:
1508 * @start_ctx: saved processor state
1510 * This method is called by the Mono Debugger to call all `finally' clauses of the
1511 * current stack frame. It's used when the user issues a `return' command to make
1512 * the current stack frame return. After returning from this method, the debugger
1513 * unwinds the stack one frame and gives control back to the user.
1515 * NOTE: This method is only used when running inside the Mono Debugger.
1518 mono_debugger_run_finally (MonoContext *start_ctx)
1520 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1521 MonoDomain *domain = mono_domain_get ();
1522 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1523 MonoLMF *lmf = mono_get_lmf ();
1524 MonoContext ctx, new_ctx;
1525 MonoJitInfo *ji, rji;
1530 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1531 if (!ji || ji == (gpointer)-1)
1535 call_filter = mono_get_call_filter ();
1537 for (i = 0; i < ji->num_clauses; i++) {
1538 MonoJitExceptionInfo *ei = &ji->clauses [i];
1540 if ((ei->try_start <= MONO_CONTEXT_GET_IP (&ctx)) &&
1541 (MONO_CONTEXT_GET_IP (&ctx) < ei->try_end) &&
1542 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1543 call_filter (&ctx, ei->handler_start);
1549 * mono_handle_exception:
1550 * @ctx: saved processor state
1551 * @obj: the exception object
1552 * @test_only: only test if the exception is caught, but dont call handlers
1555 mono_handle_exception (MonoContext *ctx, gpointer obj, gpointer original_ip, gboolean test_only)
1558 mono_perfcounters->exceptions_thrown++;
1560 return mono_handle_exception_internal (ctx, obj, original_ip, test_only, FALSE, NULL, NULL);
1563 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1565 #ifndef MONO_ARCH_USE_SIGACTION
1566 #error "Can't use sigaltstack without sigaction"
1569 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1572 mono_setup_altstack (MonoJitTlsData *tls)
1575 struct sigaltstack sa;
1576 guint8 *staddr = NULL;
1578 if (mono_running_on_valgrind ())
1581 mono_thread_get_stack_bounds (&staddr, &stsize);
1585 tls->end_of_stack = staddr + stsize;
1587 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1589 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1590 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1592 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1593 /* mprotect can fail for the main thread stack */
1594 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);
1595 g_assert (gaddr == tls->stack_ovf_guard_base);
1599 * threads created by nptl does not seem to have a guard page, and
1600 * since the main thread is not created by us, we can't even set one.
1601 * Increasing stsize fools the SIGSEGV signal handler into thinking this
1602 * is a stack overflow exception.
1604 tls->stack_size = stsize + mono_pagesize ();
1606 /* Setup an alternate signal stack */
1607 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1608 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1610 g_assert (tls->signal_stack);
1612 sa.ss_sp = tls->signal_stack;
1613 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1614 sa.ss_flags = SS_ONSTACK;
1615 sigaltstack (&sa, NULL);
1619 mono_free_altstack (MonoJitTlsData *tls)
1621 struct sigaltstack sa;
1624 sa.ss_sp = tls->signal_stack;
1625 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1626 sa.ss_flags = SS_DISABLE;
1627 err = sigaltstack (&sa, NULL);
1628 g_assert (err == 0);
1630 if (tls->signal_stack)
1631 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1634 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1637 mono_setup_altstack (MonoJitTlsData *tls)
1642 mono_free_altstack (MonoJitTlsData *tls)
1646 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1649 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1651 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1652 /* we need to leave some room for throwing the exception */
1653 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1654 unprotect_size -= mono_pagesize ();
1655 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1656 * is sufficient stack
1658 //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);
1660 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1661 return unprotect_size == jit_tls->stack_ovf_guard_size;
1665 try_more_restore (void)
1667 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1668 if (try_restore_stack_protection (jit_tls, 500))
1669 jit_tls->restore_stack_prot = NULL;
1673 restore_stack_protection (void)
1675 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1676 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1677 /* if we can't restore the stack protection, keep a callback installed so
1678 * we'll try to restore as much stack as we can at each return from unmanaged
1681 if (try_restore_stack_protection (jit_tls, 4096))
1682 jit_tls->restore_stack_prot = NULL;
1684 jit_tls->restore_stack_prot = try_more_restore_tramp;
1685 /* here we also throw a stack overflow exception */
1686 ex->trace_ips = NULL;
1687 ex->stack_trace = NULL;
1688 mono_raise_exception (ex);
1692 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1694 void (*func)(void) = (gpointer)tramp_data;
1700 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
1702 /* we got a stack overflow in the soft-guard pages
1703 * There are two cases:
1704 * 1) managed code caused the overflow: we unprotect the soft-guard page
1705 * and let the arch-specific code trigger the exception handling mechanism
1706 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1707 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1708 * and hope we can continue with those enabled, at least until the hard-guard page
1709 * is hit. The alternative to continuing here is to just print a message and abort.
1710 * We may add in the future the code to protect the pages again in the codepath
1711 * when we return from unmanaged to managed code.
1713 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
1714 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
1715 /* we unprotect the minimum amount we can */
1717 gboolean handled = FALSE;
1719 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
1720 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
1721 guard_size -= mono_pagesize ();
1723 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
1724 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
1725 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);
1726 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1728 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
1733 /* We print a message: after this even managed stack overflows
1734 * may crash the runtime
1736 fprintf (stderr, "Stack overflow in unmanaged: IP: %p, fault addr: %p\n", mono_arch_ip_from_context (ctx), fault_addr);
1737 if (!jit_tls->handling_stack_ovf) {
1738 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
1739 jit_tls->handling_stack_ovf = 1;
1741 /*fprintf (stderr, "Already handling stack overflow\n");*/
1750 print_stack_frame (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed, gpointer data)
1752 FILE *stream = (FILE*)data;
1755 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1756 fprintf (stream, " %s\n", location);
1759 fprintf (stream, " at <unknown> <0x%05x>\n", native_offset);
1764 static G_GNUC_UNUSED gboolean
1765 print_stack_frame_to_string (MonoMethod *method, gint32 native_offset, gint32 il_offset, gboolean managed,
1768 GString *p = (GString*)data;
1771 gchar *location = mono_debug_print_stack_frame (method, native_offset, mono_domain_get ());
1772 g_string_append_printf (p, " %s\n", location);
1775 g_string_append_printf (p, " at <unknown> <0x%05x>\n", native_offset);
1780 static gboolean handling_sigsegv = FALSE;
1783 * mono_handle_native_sigsegv:
1785 * Handle a SIGSEGV received while in native code by printing diagnostic
1786 * information and aborting.
1789 mono_handle_native_sigsegv (int signal, void *ctx)
1791 #ifdef MONO_ARCH_USE_SIGACTION
1792 struct sigaction sa;
1794 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1796 if (handling_sigsegv)
1799 if (mini_get_debug_options ()->suspend_on_sigsegv) {
1800 fprintf (stderr, "Received SIGSEGV, suspending...");
1805 /* To prevent infinite loops when the stack walk causes a crash */
1806 handling_sigsegv = TRUE;
1808 /* !jit_tls means the thread was not registered with the runtime */
1809 if (jit_tls && mono_thread_internal_current ()) {
1810 fprintf (stderr, "Stacktrace:\n\n");
1812 mono_jit_walk_stack (print_stack_frame, TRUE, stderr);
1817 #ifdef HAVE_BACKTRACE_SYMBOLS
1822 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
1824 fprintf (stderr, "\nNative stacktrace:\n\n");
1826 size = backtrace (array, 256);
1827 names = backtrace_symbols (array, size);
1828 for (i =0; i < size; ++i) {
1829 fprintf (stderr, "\t%s\n", names [i]);
1835 /* Try to get more meaningful information using gdb */
1837 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
1838 if (!mini_get_debug_options ()->no_gdb_backtrace && !mono_debug_using_mono_debugger ()) {
1839 /* From g_spawn_command_line_sync () in eglib */
1841 int stdout_pipe [2] = { -1, -1 };
1846 res = pipe (stdout_pipe);
1847 g_assert (res != -1);
1851 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
1852 * it will deadlock. Call the syscall directly instead.
1854 pid = mono_runtime_syscall_fork ();
1857 close (stdout_pipe [0]);
1858 dup2 (stdout_pipe [1], STDOUT_FILENO);
1860 for (i = getdtablesize () - 1; i >= 3; i--)
1863 if (!mono_gdb_render_native_backtraces ())
1864 close (STDOUT_FILENO);
1869 close (stdout_pipe [1]);
1871 fprintf (stderr, "\nDebug info from gdb:\n\n");
1874 int nread = read (stdout_pipe [0], buffer, 1024);
1878 write (STDERR_FILENO, buffer, nread);
1881 waitpid (pid, &status, WNOHANG);
1885 * A SIGSEGV indicates something went very wrong so we can no longer depend
1886 * on anything working. So try to print out lots of diagnostics, starting
1887 * with ones which have a greater chance of working.
1891 "=================================================================\n"
1892 "Got a %s while executing native code. This usually indicates\n"
1893 "a fatal error in the mono runtime or one of the native libraries \n"
1894 "used by your application.\n"
1895 "=================================================================\n"
1901 #ifdef MONO_ARCH_USE_SIGACTION
1903 /* Remove our SIGABRT handler */
1904 sa.sa_handler = SIG_DFL;
1905 sigemptyset (&sa.sa_mask);
1908 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
1916 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
1918 MonoInternalThread *thread = mono_thread_internal_current ();
1919 #if defined(__i386__) || defined(__x86_64__)
1922 GString* text = g_string_new (0);
1923 char *name, *wapi_desc;
1924 GError *error = NULL;
1927 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
1929 g_string_append_printf (text, "\n\"%s\"", name);
1932 else if (thread->threadpool_thread)
1933 g_string_append (text, "\n\"<threadpool thread>\"");
1935 g_string_append (text, "\n\"<unnamed thread>\"");
1938 wapi_desc = wapi_current_thread_desc ();
1939 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
1943 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
1945 memcpy (&ctx, start_ctx, sizeof (MonoContext));
1947 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
1949 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
1951 mono_jit_walk_stack_from_ctx (print_stack_frame_to_string, &ctx, TRUE, text);
1953 printf ("\t<Stack traces in thread dumps not supported on this platform>\n");
1956 fprintf (stdout, "%s", text->str);
1957 g_string_free (text, TRUE);
1962 * mono_print_thread_dump:
1964 * Print information about the current thread to stdout.
1965 * SIGCTX can be NULL, allowing this to be called from gdb.
1968 mono_print_thread_dump (void *sigctx)
1970 mono_print_thread_dump_internal (sigctx, NULL);
1974 mono_print_thread_dump_from_ctx (MonoContext *ctx)
1976 mono_print_thread_dump_internal (NULL, ctx);
1980 * mono_resume_unwind:
1982 * This is called by code at the end of LLVM compiled finally clauses to continue
1986 mono_resume_unwind (void)
1988 MonoJitTlsData *jit_tls = TlsGetValue (mono_jit_tls_id);
1989 static void (*restore_context) (MonoContext *);
1992 memcpy (&ctx, &jit_tls->ex_ctx, sizeof (MonoContext));
1994 mono_handle_exception_internal (&ctx, jit_tls->ex_obj, NULL, FALSE, TRUE, NULL, NULL);
1996 if (!restore_context)
1997 restore_context = mono_get_restore_context ();
1999 restore_context (&ctx);