2 * mini-exceptions.c: generic exception support
5 * Dietmar Maurer (dietmar@ximian.com)
6 * Mono Team (mono-list@lists.ximian.com)
8 * Copyright 2001-2003 Ximian, Inc.
9 * Copyright 2003-2008 Novell, Inc.
10 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
18 #ifdef HAVE_EXECINFO_H
22 #ifdef HAVE_SYS_TYPES_H
23 #include <sys/types.h>
26 #ifdef HAVE_SYS_WAIT_H
34 #ifdef HAVE_SYS_SYSCALL_H
35 #include <sys/syscall.h>
38 #include <mono/metadata/appdomain.h>
39 #include <mono/metadata/tabledefs.h>
40 #include <mono/metadata/threads.h>
41 #include <mono/metadata/threads-types.h>
42 #include <mono/metadata/debug-helpers.h>
43 #include <mono/metadata/exception.h>
44 #include <mono/metadata/gc-internal.h>
45 #include <mono/metadata/mono-debug.h>
46 #include <mono/metadata/profiler.h>
47 #include <mono/metadata/mono-endian.h>
48 #include <mono/metadata/environment.h>
49 #include <mono/utils/mono-mmap.h>
50 #include <mono/utils/mono-logger-internal.h>
54 #include "debugger-agent.h"
56 #ifndef MONO_ARCH_CONTEXT_DEF
57 #define MONO_ARCH_CONTEXT_DEF
60 static gpointer restore_context_func, call_filter_func;
61 static gpointer throw_exception_func, rethrow_exception_func;
62 static gpointer throw_corlib_exception_func;
64 static gpointer try_more_restore_tramp = NULL;
65 static gpointer restore_stack_protection_tramp = NULL;
67 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
68 static gpointer unhandled_exception_hook_data = NULL;
70 static void try_more_restore (void);
71 static void restore_stack_protection (void);
72 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
73 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
74 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
77 mono_exceptions_init (void)
79 MonoRuntimeExceptionHandlingCallbacks cbs;
81 restore_context_func = mono_aot_get_trampoline ("restore_context");
82 call_filter_func = mono_aot_get_trampoline ("call_filter");
83 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
84 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
88 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
89 mono_tramp_info_register (info);
90 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
91 mono_tramp_info_register (info);
92 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
93 mono_tramp_info_register (info);
94 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
95 mono_tramp_info_register (info);
97 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
98 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
99 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
102 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
103 mono_arch_exceptions_init ();
105 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
106 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
107 cbs.mono_raise_exception = mono_get_throw_exception ();
108 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
109 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
110 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
111 mono_install_eh_callbacks (&cbs);
115 mono_get_throw_exception (void)
117 g_assert (throw_exception_func);
118 return throw_exception_func;
122 mono_get_rethrow_exception (void)
124 g_assert (rethrow_exception_func);
125 return rethrow_exception_func;
129 mono_get_call_filter (void)
131 g_assert (call_filter_func);
132 return call_filter_func;
136 mono_get_restore_context (void)
138 g_assert (restore_context_func);
139 return restore_context_func;
143 mono_get_throw_corlib_exception (void)
145 gpointer code = NULL;
148 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
149 if (throw_corlib_exception_func)
150 return throw_corlib_exception_func;
153 code = mono_aot_get_trampoline ("throw_corlib_exception");
155 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
156 mono_tramp_info_register (info);
159 mono_memory_barrier ();
161 throw_corlib_exception_func = code;
163 return throw_corlib_exception_func;
167 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
169 MonoTryBlockHoleTableJitInfo *table;
174 if (ei->try_start > ip || ip >= ei->try_end)
177 if (!ji->has_try_block_holes)
180 table = mono_jit_info_get_try_block_hole_table_info (ji);
181 offset = (guint32)((char*)ip - (char*)ji->code_start);
182 clause = (guint16)(ei - ji->clauses);
183 g_assert (clause < ji->num_clauses);
185 for (i = 0; i < table->num_holes; ++i) {
186 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
187 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
196 * Translate between the mono_arch_find_jit_info function and the old API.
199 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
200 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
202 StackFrameInfo frame;
205 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
207 /* Avoid costly table lookup during stack overflow */
208 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
211 ji = mini_jit_info_table_find (domain, ip, NULL);
216 err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
220 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
222 * Remove any unused lmf.
223 * Mask out the lower bits which might be used to hold additional information.
225 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
228 /* Convert between the new and the old APIs */
229 switch (frame.type) {
230 case FRAME_TYPE_MANAGED:
234 case FRAME_TYPE_MANAGED_TO_NATIVE:
238 memset (res, 0, sizeof (MonoJitInfo));
239 res->d.method = frame.method;
242 case FRAME_TYPE_DEBUGGER_INVOKE: {
246 * The normal exception handling code can't handle this frame, so just
249 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
250 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
254 g_assert_not_reached ();
259 /* mono_find_jit_info:
261 * This function is used to gather information from @ctx. It return the
262 * MonoJitInfo of the corresponding function, unwinds one stack frame and
263 * stores the resulting context into @new_ctx. It also stores a string
264 * describing the stack location into @trace (if not NULL), and modifies
265 * the @lmf if necessary. @native_offset return the IP offset from the
266 * start of the function or -1 if that info is not available.
269 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
270 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
274 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
276 MonoMethod *method = NULL;
287 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
289 if (ji == (gpointer)-1)
293 method = jinfo_get_method (ji);
295 if (managed2 || (ji && method->wrapper_type)) {
296 const char *real_ip, *start;
299 start = (const char *)ji->code_start;
301 /* ctx->ip points into native code */
302 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
304 real_ip = (const char*)ip;
306 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
307 offset = real_ip - start;
312 *native_offset = offset;
315 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
319 *trace = mono_debug_print_stack_frame (method, offset, domain);
322 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
323 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
332 * mono_find_jit_info_ext:
334 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
336 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
337 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
338 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
339 * to obtain the last managed frame.
340 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
341 * On return, it will be filled with the locations where callee saved registers are saved
342 * by the current frame. This is returned outside of StackFrameInfo because it can be
343 * quite large on some platforms.
344 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
348 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
349 MonoJitInfo *prev_ji, MonoContext *ctx,
350 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
351 mgreg_t **save_locations,
352 StackFrameInfo *frame)
355 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
357 MonoDomain *target_domain = domain;
358 MonoMethod *method = NULL;
359 gboolean async = mono_thread_info_is_async_context ();
364 /* Avoid costly table lookup during stack overflow */
365 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
368 ji = mini_jit_info_table_find (domain, ip, &target_domain);
371 target_domain = domain;
374 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
376 err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
380 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
382 * Remove any unused lmf.
383 * Mask out the lower bits which might be used to hold additional information.
385 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
388 if (frame->ji && !frame->ji->async)
389 method = jinfo_get_method (frame->ji);
391 if (frame->type == FRAME_TYPE_MANAGED && method) {
392 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
393 frame->managed = TRUE;
396 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
398 * This type of frame is just a marker, the caller should unwind once more to get the
399 * last managed frame.
402 frame->method = NULL;
405 frame->native_offset = -1;
406 frame->domain = target_domain;
407 frame->async_context = async;
411 if (frame->type == FRAME_TYPE_MANAGED)
412 frame->method = method;
414 if (ji && (frame->managed || (method && method->wrapper_type))) {
415 const char *real_ip, *start;
417 start = (const char *)ji->code_start;
419 /* ctx->ip points into native code */
420 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
422 real_ip = (const char*)ip;
424 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
425 frame->native_offset = real_ip - start;
427 frame->native_offset = -1;
430 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
432 if (trace && frame->method) {
433 char *fname = mono_method_full_name (frame->method, TRUE);
434 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
443 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
445 MonoGenericJitInfo *gi;
449 if (!ji->has_generic_jit_info)
451 gi = mono_jit_info_get_generic_jit_info (ji);
457 * Search location list if available, it contains the precise location of the
458 * argument for every pc offset, even if the method was interrupted while it was in
462 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
465 for (i = 0; i < gi->nlocs; ++i) {
466 MonoDwarfLocListEntry *entry = &gi->locations [i];
468 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
470 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
472 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
476 g_assert (i < gi->nlocs);
479 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
481 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
485 method = jinfo_get_method (ji);
486 if (mono_method_get_context (method)->method_inst) {
488 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
491 /* Avoid returning a managed object */
492 MonoObject *this_obj = info;
494 return this_obj->vtable->klass;
498 static MonoGenericContext
499 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
501 MonoGenericContext context = { NULL, NULL };
502 MonoClass *class, *method_container_class;
505 g_assert (generic_info);
507 method = jinfo_get_method (ji);
508 g_assert (method->is_inflated);
509 if (mono_method_get_context (method)->method_inst) {
510 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
512 class = mrgctx->class_vtable->klass;
513 context.method_inst = mrgctx->method_inst;
514 g_assert (context.method_inst);
515 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
516 MonoVTable *vtable = generic_info;
518 class = vtable->klass;
520 class = generic_info;
523 //g_assert (!method->klass->generic_container);
524 if (method->klass->generic_class)
525 method_container_class = method->klass->generic_class->container_class;
527 method_container_class = method->klass;
529 /* class might refer to a subclass of method's class */
530 while (!(class == method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) {
531 class = class->parent;
535 if (class->generic_class || class->generic_container)
536 context.class_inst = mini_class_get_context (class)->class_inst;
538 if (class->generic_class)
539 g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class));
541 g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class));
547 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
549 MonoGenericContext context;
552 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
553 return jinfo_get_method (ji);
554 context = get_generic_context_from_stack_frame (ji, generic_info);
556 method = jinfo_get_method (ji);
557 method = mono_method_get_declaring_generic_method (method);
558 method = mono_class_inflate_generic_method (method, &context);
564 * mono_exception_walk_native_trace:
565 * @ex: The exception object whose frames should be walked
566 * @func: callback to call for each stack frame
567 * @user_data: data passed to the callback
569 * This function walks the stacktrace of an exception. For
570 * each frame the callback function is called with the relevant info.
571 * The walk ends when no more stack frames are found or when the callback
572 * returns a TRUE value.
576 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
578 MonoDomain *domain = mono_domain_get ();
579 MonoArray *ta = ex->trace_ips;
585 len = mono_array_length (ta) >> 1;
586 for (i = 0; i < len; i++) {
587 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
588 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
589 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
592 if (func (NULL, ip, 0, FALSE, user_data))
595 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
596 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
605 ves_icall_System_Exception_get_trace (MonoException *ex)
607 MonoDomain *domain = mono_domain_get ();
609 MonoArray *ta = ex->trace_ips;
614 /* Exception is not thrown yet */
617 len = mono_array_length (ta) >> 1;
618 trace_str = g_string_new ("");
619 for (i = 0; i < len; i++) {
621 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
622 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
624 ji = mono_jit_info_table_find (domain, ip);
626 /* Unmanaged frame */
627 g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip);
631 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
633 address = (char *)ip - (char *)ji->code_start;
634 location = mono_debug_print_stack_frame (
635 method, address, ex->object.vtable->domain);
637 g_string_append_printf (trace_str, "%s\n", location);
642 res = mono_string_new (ex->object.vtable->domain, trace_str->str);
643 g_string_free (trace_str, TRUE);
649 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
651 MonoDomain *domain = mono_domain_get ();
653 MonoArray *ta = exc->trace_ips;
654 MonoDebugSourceLocation *location;
658 /* Exception is not thrown yet */
659 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
662 len = mono_array_length (ta) >> 1;
664 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
666 for (i = skip; i < len; i++) {
668 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
669 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
670 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
673 ji = mono_jit_info_table_find (domain, ip);
675 /* Unmanaged frame */
676 mono_array_setref (res, i, sf);
680 g_assert (ji != NULL);
682 method = get_method_from_stack_frame (ji, generic_info);
683 if (jinfo_get_method (ji)->wrapper_type) {
687 s = mono_method_full_name (method, TRUE);
688 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
692 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
693 sf->native_offset = (char *)ip - (char *)ji->code_start;
696 * mono_debug_lookup_source_location() returns both the file / line number information
697 * and the IL offset. Note that computing the IL offset is already an expensive
698 * operation, so we shouldn't call this method twice.
700 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
702 sf->il_offset = location->il_offset;
706 if (need_file_info) {
707 if (location && location->source_file) {
708 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
709 sf->line = location->row;
710 sf->column = location->column;
712 sf->line = sf->column = 0;
717 mono_debug_free_source_location (location);
718 mono_array_setref (res, i, sf);
725 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
728 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
729 if (jit_tls && jit_tls->orig_ex_ctx_set)
730 start_ctx = &jit_tls->orig_ex_ctx;
732 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
735 * mono_walk_stack_with_ctx:
737 * Unwind the current thread starting at @start_ctx.
739 * If @start_ctx is null, we capture the current context.
742 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
744 MonoContext extra_ctx;
745 MonoInternalThread *thread = mono_thread_internal_current ();
746 MONO_ARCH_CONTEXT_DEF
748 if (!thread || !thread->jit_data)
752 mono_arch_flush_register_windows ();
754 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
755 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
757 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
759 start_ctx = &extra_ctx;
762 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
766 * mono_walk_stack_with_state:
768 * Unwind a thread described by @state.
770 * State must be valid (state->valid == TRUE).
772 * If you are using this function to unwind another thread, make sure it is suspended.
774 * If @state is null, we capture the current context.
777 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
779 MonoThreadUnwindState extra_state;
781 g_assert (!mono_thread_info_is_async_context ());
782 if (!mono_thread_state_init_from_current (&extra_state))
784 state = &extra_state;
787 g_assert (state->valid);
789 mono_walk_stack_full (func,
791 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
792 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
793 state->unwind_data [MONO_UNWIND_DATA_LMF],
794 unwind_options, user_data);
798 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
800 MonoThreadUnwindState state;
801 if (!mono_thread_state_init_from_current (&state))
803 mono_walk_stack_with_state (func, &state, options, user_data);
807 * mono_walk_stack_full:
808 * @func: callback to call for each stack frame
809 * @domain: starting appdomain, can be NULL to use the current domain
810 * @unwind_options: what extra information the unwinder should gather
811 * @start_ctx: starting state of the stack walk, can be NULL.
812 * @thread: the thread whose stack to walk, can be NULL to use the current thread
813 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
814 * @user_data: data passed to the callback
816 * This function walks the stack of a thread, starting from the state
817 * represented by start_ctx. For each frame the callback
818 * function is called with the relevant info. The walk ends when no more
819 * managed stack frames are found or when the callback returns a TRUE value.
822 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
825 MonoContext ctx, new_ctx;
826 StackFrameInfo frame;
828 mgreg_t *reg_locations [MONO_MAX_IREGS];
829 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
830 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
831 gboolean async = mono_thread_info_is_async_context ();
833 g_assert (start_ctx);
836 /*The LMF will be null if the target have no managed frames.*/
837 /* g_assert (lmf); */
840 g_assert (unwind_options == MONO_UNWIND_NONE);
842 memcpy (&ctx, start_ctx, sizeof (MonoContext));
843 memset (reg_locations, 0, sizeof (reg_locations));
845 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
847 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
851 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) {
852 MonoDebugSourceLocation *source;
854 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
855 il_offset = source ? source->il_offset : -1;
856 mono_debug_free_source_location (source);
860 frame.il_offset = il_offset;
862 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) {
863 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
865 frame.actual_method = frame.method;
868 if (get_reg_locations)
869 frame.reg_locations = reg_locations;
871 if (func (&frame, &ctx, user_data))
874 if (get_reg_locations) {
875 for (i = 0; i < MONO_MAX_IREGS; ++i)
876 if (new_reg_locations [i])
877 reg_locations [i] = new_reg_locations [i];
885 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
886 MonoReflectionMethod **method,
887 gint32 *iloffset, gint32 *native_offset,
888 MonoString **file, gint32 *line, gint32 *column)
890 MonoDomain *domain = mono_domain_get ();
891 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
892 MonoLMF *lmf = mono_get_lmf ();
893 MonoJitInfo *ji = NULL;
894 MonoContext ctx, new_ctx;
895 MonoDebugSourceLocation *location;
896 MonoMethod *jmethod = NULL, *actual_method;
897 StackFrameInfo frame;
900 MONO_ARCH_CONTEXT_DEF;
902 mono_arch_flush_register_windows ();
904 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
905 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
907 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
913 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
917 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE)
921 *native_offset = frame.native_offset;
923 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
924 jmethod = jinfo_get_method (ji);
925 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
930 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
932 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
934 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
936 *iloffset = location->il_offset;
940 if (need_file_info) {
942 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
943 *line = location->row;
944 *column = location->column;
951 mono_debug_free_source_location (location);
958 MonoSecurityFrame *frame;
959 } MonoFrameSecurityInfo;
962 callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
964 MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data;
965 MonoJitInfo *ji = frame->ji;
971 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
972 method = jinfo_get_method (ji);
973 if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
974 method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
975 method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
976 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
977 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
986 si->frame = mono_declsec_create_frame (frame->domain, ji);
988 /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */
993 * ves_icall_System_Security_SecurityFrame_GetSecurityFrame:
994 * @skip: the number of stack frames to skip
996 * This function returns a the security informations of a single stack frame
997 * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice]
998 * and [NonCas]InheritanceDemand[Choice] as only the caller security is
1002 ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip)
1004 MonoFrameSecurityInfo si;
1009 mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si);
1011 return (si.skips == 0) ? si.frame : NULL;
1020 } MonoSecurityStack;
1023 grow_array (MonoSecurityStack *stack)
1025 MonoDomain *domain = mono_domain_get ();
1026 guint32 newsize = (stack->maximum << 1);
1027 MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize);
1029 for (i=0; i < stack->maximum; i++) {
1030 gpointer frame = mono_array_get (stack->stack, gpointer, i);
1031 mono_array_setref (newstack, i, frame);
1033 stack->maximum = newsize;
1034 stack->stack = newstack;
1038 callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
1040 MonoSecurityStack *ss = (MonoSecurityStack*) data;
1041 MonoJitInfo *ji = frame->ji;
1047 /* FIXME: skip all wrappers ?? probably not - case by case testing is required */
1048 method = jinfo_get_method (ji);
1049 if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE ||
1050 method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE ||
1051 method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH ||
1052 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK ||
1053 method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) {
1057 if (ss->skips > 0) {
1062 if (ss->count == ss->maximum)
1065 mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji));
1067 /* continue down the stack */
1072 glist_to_array (GList *list, MonoClass *eclass)
1074 MonoDomain *domain = mono_domain_get ();
1081 len = g_list_length (list);
1082 res = mono_array_new (domain, eclass, len);
1084 for (i = 0; list; list = list->next, i++)
1085 mono_array_set (res, gpointer, i, list->data);
1091 * ves_icall_System_Security_SecurityFrame_GetSecurityStack:
1092 * @skip: the number of stack frames to skip
1094 * This function returns an managed array of containing the security
1095 * informations for each frame (after the skipped ones). This is used for
1096 * [NonCas]Demand[Choice] where the complete evaluation of the stack is
1100 ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip)
1102 MonoSecurityStack ss;
1104 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
1110 ss.maximum = MONO_CAS_INITIAL_STACK_SIZE;
1111 ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum);
1112 mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss);
1113 /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */
1118 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1120 MonoClass *catch_class = ei->data.catch_class;
1121 MonoType *inflated_type;
1122 MonoGenericContext context;
1124 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1125 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1128 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1130 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1132 /* FIXME: we shouldn't inflate but instead put the
1133 type in the rgctx and fetch it from there. It
1134 might be a good idea to do this lazily, i.e. only
1135 when the exception is actually thrown, so as not to
1136 waste space for exception clauses which might never
1138 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1139 catch_class = mono_class_from_mono_type (inflated_type);
1140 mono_metadata_free_type (inflated_type);
1146 * mini_jit_info_table_find:
1148 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1149 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1150 * OUT_DOMAIN if it is not NULL.
1153 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1156 MonoInternalThread *t = mono_thread_internal_current ();
1162 ji = mono_jit_info_table_find (domain, addr);
1165 *out_domain = domain;
1169 /* maybe it is shared code, so we also search in the root domain */
1170 if (domain != mono_get_root_domain ()) {
1171 ji = mono_jit_info_table_find (mono_get_root_domain (), addr);
1174 *out_domain = mono_get_root_domain ();
1182 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1183 for (; refs && *refs; refs++) {
1184 if (*refs != domain && *refs != mono_get_root_domain ()) {
1185 ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr);
1188 *out_domain = (MonoDomain*) *refs;
1198 * wrap_non_exception_throws:
1200 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1201 * WrapNonExceptionThrows flag set.
1204 wrap_non_exception_throws (MonoMethod *m)
1206 MonoAssembly *ass = m->klass->image->assembly;
1207 MonoCustomAttrInfo* attrs;
1208 static MonoClass *klass;
1210 gboolean val = FALSE;
1213 if (ass->wrap_non_exception_throws_inited)
1214 return ass->wrap_non_exception_throws;
1216 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1218 attrs = mono_custom_attrs_from_assembly (ass);
1220 for (i = 0; i < attrs->num_attrs; ++i) {
1221 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1223 int len, num_named, named_type, data_type, name_len;
1226 if (!attr->ctor || attr->ctor->klass != klass)
1228 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1229 len = attr->data_size;
1230 p = (const char*)attr->data;
1231 g_assert (read16 (p) == 0x0001);
1233 num_named = read16 (p);
1242 if (named_type != 0x54)
1244 name_len = mono_metadata_decode_blob_size (p, &p);
1245 name = g_malloc (name_len + 1);
1246 memcpy (name, p, name_len);
1247 name [name_len] = 0;
1249 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1251 /* The value is a BOOLEAN */
1254 mono_custom_attrs_free (attrs);
1257 ass->wrap_non_exception_throws = val;
1258 mono_memory_barrier ();
1259 ass->wrap_non_exception_throws_inited = TRUE;
1264 #ifndef MONO_ARCH_STACK_GROWS_UP
1265 #define DOES_STACK_GROWS_UP 1
1267 #define DOES_STACK_GROWS_UP 0
1270 #define MAX_UNMANAGED_BACKTRACE 128
1272 build_native_trace (void)
1274 /* This puppy only makes sense on mobile, IOW, ARM. */
1275 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1277 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1278 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1283 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1285 for (i = 0; i < size; i++)
1286 mono_array_set (res, gpointer, i, native_trace [i]);
1293 #define setup_managed_stacktrace_information() do { \
1294 if (mono_ex && !initial_trace_ips) { \
1295 trace_ips = g_list_reverse (trace_ips); \
1296 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \
1297 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \
1298 if (has_dynamic_methods) \
1299 /* These methods could go away anytime, so compute the stack trace now */ \
1300 MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \
1302 g_list_free (trace_ips); \
1306 * mono_handle_exception_internal_first_pass:
1308 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1309 * OBJ is found. Run the index of the filter clause which caught the exception into
1310 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1313 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1315 MonoDomain *domain = mono_domain_get ();
1316 MonoJitInfo *ji = NULL;
1317 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1318 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1319 MonoLMF *lmf = mono_get_lmf ();
1320 MonoArray *initial_trace_ips = NULL;
1321 GList *trace_ips = NULL;
1322 MonoException *mono_ex;
1323 gboolean stack_overflow = FALSE;
1324 MonoContext initial_ctx;
1326 int frame_count = 0;
1327 gboolean has_dynamic_methods = FALSE;
1332 g_assert (ctx != NULL);
1334 if (obj == domain->stack_overflow_ex)
1335 stack_overflow = TRUE;
1337 mono_ex = (MonoException*)obj;
1338 initial_trace_ips = mono_ex->trace_ips;
1340 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1341 mono_ex = (MonoException*)obj;
1342 initial_trace_ips = mono_ex->trace_ips;
1348 call_filter = mono_get_call_filter ();
1350 g_assert (jit_tls->end_of_stack);
1351 g_assert (jit_tls->abort_func);
1354 *out_filter_idx = -1;
1358 *out_prev_ji = NULL;
1363 MonoContext new_ctx;
1365 int clause_index_start = 0;
1366 gboolean unwind_res = TRUE;
1368 StackFrameInfo frame;
1373 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1375 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1379 g_assert (frame.type == FRAME_TYPE_MANAGED);
1384 setup_managed_stacktrace_information ();
1389 method = jinfo_get_method (ji);
1390 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1392 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1393 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1394 "The native frame called the managed method:\n%s\n",
1395 mono_method_full_name (method, TRUE));
1398 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1400 * Avoid overwriting the stack trace if the exception is
1401 * rethrown. Also avoid giant stack traces during a stack
1404 if (!initial_trace_ips && (frame_count < 1000)) {
1405 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1406 trace_ips = g_list_prepend (trace_ips,
1407 get_generic_info_from_stack_frame (ji, ctx));
1411 if (method->dynamic)
1412 has_dynamic_methods = TRUE;
1414 if (stack_overflow) {
1415 if (DOES_STACK_GROWS_UP)
1416 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1418 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1420 free_stack = 0xffffff;
1423 for (i = clause_index_start; i < ji->num_clauses; i++) {
1424 MonoJitExceptionInfo *ei = &ji->clauses [i];
1425 gboolean filtered = FALSE;
1428 * During stack overflow, wait till the unwinding frees some stack
1429 * space before running handlers/finalizers.
1431 if (free_stack <= (64 * 1024))
1434 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1436 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1439 * Have to unwrap RuntimeWrappedExceptions if the
1440 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1442 if (non_exception && !wrap_non_exception_throws (method))
1443 ex_obj = non_exception;
1447 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1448 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1449 #ifndef DISABLE_PERFCOUNTERS
1450 mono_perfcounters->exceptions_filters++;
1453 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1454 trim the stackframe since if it returns FALSE we lose information.
1456 FIXME Not 100% sure if it's a good idea even with user clauses.
1459 setup_managed_stacktrace_information ();
1461 if (ji->from_llvm) {
1462 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1463 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1465 g_assert_not_reached ();
1468 /* store the exception object in bp + ei->exvar_offset */
1469 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1472 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1473 filtered = call_filter (ctx, ei->data.filter);
1474 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1475 if (filtered && out_filter_idx)
1476 *out_filter_idx = filter_idx;
1483 setup_managed_stacktrace_information ();
1484 /* mono_debugger_agent_handle_exception () needs this */
1485 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1490 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1491 setup_managed_stacktrace_information ();
1496 /* mono_debugger_agent_handle_exception () needs this */
1497 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1506 g_assert_not_reached ();
1510 * mono_handle_exception_internal:
1511 * @ctx: saved processor state
1512 * @obj: the exception object
1513 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1516 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1518 MonoDomain *domain = mono_domain_get ();
1519 MonoJitInfo *ji, *prev_ji;
1520 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1521 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1522 MonoLMF *lmf = mono_get_lmf ();
1523 MonoException *mono_ex;
1524 gboolean stack_overflow = FALSE;
1525 MonoContext initial_ctx;
1527 int frame_count = 0;
1528 gint32 filter_idx, first_filter_idx = 0;
1531 MonoObject *non_exception = NULL;
1533 g_assert (ctx != NULL);
1535 MonoException *ex = mono_get_exception_null_reference ();
1536 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1537 obj = (MonoObject *)ex;
1541 * Allocate a new exception object instead of the preconstructed ones.
1543 if (obj == domain->stack_overflow_ex) {
1545 * It is not a good idea to try and put even more pressure on the little stack available.
1546 * obj = mono_get_exception_stack_overflow ();
1548 stack_overflow = TRUE;
1550 else if (obj == domain->null_reference_ex) {
1551 obj = mono_get_exception_null_reference ();
1554 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1555 non_exception = obj;
1556 obj = mono_get_exception_runtime_wrapped (obj);
1559 mono_ex = (MonoException*)obj;
1561 if (mini_get_debug_options ()->suspend_on_exception) {
1562 mono_runtime_printf_err ("Exception thrown, suspending...");
1567 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1568 mono_ex = (MonoException*)obj;
1573 if (mono_ex && jit_tls->class_cast_from) {
1574 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1575 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1576 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1577 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1578 mono_ex->message = mono_string_new (domain, msg);
1583 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1584 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1585 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1586 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1587 mono_ex->message = mono_string_new (domain, msg);
1595 call_filter = mono_get_call_filter ();
1597 g_assert (jit_tls->end_of_stack);
1598 g_assert (jit_tls->abort_func);
1601 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1602 * end up being TRUE on any code path.
1604 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1609 MonoContext ctx_cp = *ctx;
1610 if (mono_trace_is_enabled ()) {
1611 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1612 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1613 MonoObject *message;
1614 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1616 MonoObject *exc = NULL;
1617 if (get_message == NULL) {
1619 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1621 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1623 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1627 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1629 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1631 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1632 mono_print_thread_dump_from_ctx (ctx);
1634 jit_tls->orig_ex_ctx_set = TRUE;
1635 mono_profiler_exception_thrown (obj);
1636 jit_tls->orig_ex_ctx_set = FALSE;
1638 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1641 if (mini_get_debug_options ()->break_on_exc)
1643 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1645 if (mini_get_debug_options ()->suspend_on_unhandled) {
1646 mono_runtime_printf_err ("Unhandled exception, suspending...");
1651 // FIXME: This runs managed code so it might cause another stack overflow when
1652 // we are handling a stack overflow
1653 mono_unhandled_exception (obj);
1655 gboolean unhandled = FALSE;
1658 * The exceptions caught by the mono_runtime_invoke () calls in mono_async_invoke () needs to be treated as
1659 * unhandled (#669836).
1660 * FIXME: The check below is hackish, but its hard to distinguish these runtime invoke calls from others
1663 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1665 MonoInternalThread *thread = mono_thread_internal_current ();
1666 if (jinfo_get_method (prev_ji) == thread->async_invoke_method)
1671 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1673 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1683 MonoContext new_ctx;
1685 int clause_index_start = 0;
1686 gboolean unwind_res = TRUE;
1690 ji = jit_tls->resume_state.ji;
1691 new_ctx = jit_tls->resume_state.new_ctx;
1692 clause_index_start = jit_tls->resume_state.clause_index;
1693 lmf = jit_tls->resume_state.lmf;
1694 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1695 filter_idx = jit_tls->resume_state.filter_idx;
1697 StackFrameInfo frame;
1699 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1701 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) {
1705 g_assert (frame.type == FRAME_TYPE_MANAGED);
1711 *(mono_get_lmf_addr ()) = lmf;
1713 jit_tls->abort_func (obj);
1714 g_assert_not_reached ();
1717 method = jinfo_get_method (ji);
1719 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1721 if (stack_overflow) {
1722 if (DOES_STACK_GROWS_UP)
1723 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1725 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1727 free_stack = 0xffffff;
1730 for (i = clause_index_start; i < ji->num_clauses; i++) {
1731 MonoJitExceptionInfo *ei = &ji->clauses [i];
1732 gboolean filtered = FALSE;
1735 * During stack overflow, wait till the unwinding frees some stack
1736 * space before running handlers/finalizers.
1738 if (free_stack <= (64 * 1024))
1741 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1743 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1746 * Have to unwrap RuntimeWrappedExceptions if the
1747 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1749 if (non_exception && !wrap_non_exception_throws (method))
1750 ex_obj = non_exception;
1754 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1755 if (ji->from_llvm) {
1756 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1757 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1759 g_assert_not_reached ();
1762 /* store the exception object in bp + ei->exvar_offset */
1763 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1767 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1769 * Filter clauses should only be run in the
1770 * first pass of exception handling.
1772 filtered = (filter_idx == first_filter_idx);
1776 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1777 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1779 * This guards against the situation that we abort a thread that is executing a finally clause
1780 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1781 * check for this situation here and resume interruption if we are below the guarded block.
1783 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1784 gboolean is_outside = FALSE;
1785 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1786 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1787 //FIXME make this stack direction aware
1788 if (catch_bp > prot_bp) {
1790 } else if (catch_bp == prot_bp) {
1791 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1792 * So we check if the catch handler_start is protected by the guarded handler protected region
1795 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1796 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1797 * There aren't any further finally/fault handler blocks down the stack over this exception.
1798 * This must be ensured by the code that installs the guard trampoline.
1800 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1802 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1807 jit_tls->handler_block_return_address = NULL;
1808 jit_tls->handler_block = NULL;
1809 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1813 if (mono_trace_is_enabled () && mono_trace_eval (method))
1814 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1815 jit_tls->orig_ex_ctx_set = TRUE;
1816 mono_profiler_exception_clause_handler (method, ei->flags, i);
1817 jit_tls->orig_ex_ctx_set = FALSE;
1818 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1820 #ifndef DISABLE_PERFCOUNTERS
1821 mono_perfcounters->exceptions_depth += frame_count;
1823 if (obj == domain->stack_overflow_ex)
1824 jit_tls->handling_stack_ovf = FALSE;
1828 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1829 (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) {
1830 if (mono_trace_is_enabled () && mono_trace_eval (method))
1831 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1832 jit_tls->orig_ex_ctx_set = TRUE;
1833 mono_profiler_exception_clause_handler (method, ei->flags, i);
1834 jit_tls->orig_ex_ctx_set = FALSE;
1835 call_filter (ctx, ei->handler_start);
1837 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) &&
1838 (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) {
1839 if (mono_trace_is_enabled () && mono_trace_eval (method))
1840 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1841 jit_tls->orig_ex_ctx_set = TRUE;
1842 mono_profiler_exception_clause_handler (method, ei->flags, i);
1843 jit_tls->orig_ex_ctx_set = FALSE;
1844 #ifndef DISABLE_PERFCOUNTERS
1845 mono_perfcounters->exceptions_finallys++;
1848 if (ji->from_llvm) {
1850 * LLVM compiled finally handlers follow the design
1851 * of the c++ ehabi, i.e. they call a resume function
1852 * at the end instead of returning to the caller.
1853 * So save the exception handling state,
1854 * mono_resume_unwind () will call us again to continue
1857 jit_tls->resume_state.ex_obj = obj;
1858 jit_tls->resume_state.ji = ji;
1859 jit_tls->resume_state.clause_index = i + 1;
1860 jit_tls->resume_state.ctx = *ctx;
1861 jit_tls->resume_state.new_ctx = new_ctx;
1862 jit_tls->resume_state.lmf = lmf;
1863 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1864 jit_tls->resume_state.filter_idx = filter_idx;
1865 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1868 call_filter (ctx, ei->handler_start);
1874 jit_tls->orig_ex_ctx_set = TRUE;
1875 mono_profiler_exception_method_leave (method);
1876 jit_tls->orig_ex_ctx_set = FALSE;
1881 g_assert_not_reached ();
1885 * mono_debugger_run_finally:
1886 * @start_ctx: saved processor state
1888 * This method is called by the Mono Debugger to call all `finally' clauses of the
1889 * current stack frame. It's used when the user issues a `return' command to make
1890 * the current stack frame return. After returning from this method, the debugger
1891 * unwinds the stack one frame and gives control back to the user.
1893 * NOTE: This method is only used when running inside the Mono Debugger.
1896 mono_debugger_run_finally (MonoContext *start_ctx)
1898 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1899 MonoDomain *domain = mono_domain_get ();
1900 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1901 MonoLMF *lmf = mono_get_lmf ();
1902 MonoContext ctx, new_ctx;
1903 MonoJitInfo *ji, rji;
1908 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1909 if (!ji || ji == (gpointer)-1)
1913 call_filter = mono_get_call_filter ();
1915 for (i = 0; i < ji->num_clauses; i++) {
1916 MonoJitExceptionInfo *ei = &ji->clauses [i];
1918 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1919 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1920 call_filter (&ctx, ei->handler_start);
1926 * mono_handle_exception:
1927 * @ctx: saved processor state
1928 * @obj: the exception object
1931 mono_handle_exception (MonoContext *ctx, gpointer obj)
1933 #ifndef DISABLE_PERFCOUNTERS
1934 mono_perfcounters->exceptions_thrown++;
1937 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1940 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1942 #ifndef MONO_ARCH_USE_SIGACTION
1943 #error "Can't use sigaltstack without sigaction"
1946 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1949 mono_setup_altstack (MonoJitTlsData *tls)
1953 guint8 *staddr = NULL;
1955 if (mono_running_on_valgrind ())
1958 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1962 tls->end_of_stack = staddr + stsize;
1963 tls->stack_size = stsize;
1965 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1967 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1968 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1970 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1972 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1973 /* mprotect can fail for the main thread stack */
1974 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);
1975 g_assert (gaddr == tls->stack_ovf_guard_base);
1976 tls->stack_ovf_valloced = TRUE;
1979 /* Setup an alternate signal stack */
1980 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1981 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1983 g_assert (tls->signal_stack);
1985 sa.ss_sp = tls->signal_stack;
1986 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1988 g_assert (sigaltstack (&sa, NULL) == 0);
1990 mono_gc_register_altstack ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size, (char*)staddr + stsize - ((char*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size), tls->signal_stack, tls->signal_stack_size);
1994 mono_free_altstack (MonoJitTlsData *tls)
1999 sa.ss_sp = tls->signal_stack;
2000 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2001 sa.ss_flags = SS_DISABLE;
2002 err = sigaltstack (&sa, NULL);
2003 g_assert (err == 0);
2005 if (tls->signal_stack)
2006 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
2007 if (tls->stack_ovf_valloced)
2008 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
2010 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2013 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2016 mono_setup_altstack (MonoJitTlsData *tls)
2021 mono_free_altstack (MonoJitTlsData *tls)
2025 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2028 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2030 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2031 /* we need to leave some room for throwing the exception */
2032 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2033 unprotect_size -= mono_pagesize ();
2034 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2035 * is sufficient stack
2037 //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);
2039 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2040 return unprotect_size == jit_tls->stack_ovf_guard_size;
2043 static G_GNUC_UNUSED void
2044 try_more_restore (void)
2046 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2047 if (try_restore_stack_protection (jit_tls, 500))
2048 jit_tls->restore_stack_prot = NULL;
2051 static G_GNUC_UNUSED void
2052 restore_stack_protection (void)
2054 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2055 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2056 /* if we can't restore the stack protection, keep a callback installed so
2057 * we'll try to restore as much stack as we can at each return from unmanaged
2060 if (try_restore_stack_protection (jit_tls, 4096))
2061 jit_tls->restore_stack_prot = NULL;
2063 jit_tls->restore_stack_prot = try_more_restore_tramp;
2064 /* here we also throw a stack overflow exception */
2065 ex->trace_ips = NULL;
2066 ex->stack_trace = NULL;
2067 mono_raise_exception (ex);
2071 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2073 void (*func)(void) = (gpointer)tramp_data;
2079 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2081 /* we got a stack overflow in the soft-guard pages
2082 * There are two cases:
2083 * 1) managed code caused the overflow: we unprotect the soft-guard page
2084 * and let the arch-specific code trigger the exception handling mechanism
2085 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2086 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2087 * and hope we can continue with those enabled, at least until the hard-guard page
2088 * is hit. The alternative to continuing here is to just print a message and abort.
2089 * We may add in the future the code to protect the pages again in the codepath
2090 * when we return from unmanaged to managed code.
2092 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2093 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2094 /* we unprotect the minimum amount we can */
2096 gboolean handled = FALSE;
2098 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2099 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2100 guard_size -= mono_pagesize ();
2102 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2103 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2104 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);
2105 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2107 mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE);
2112 /* We print a message: after this even managed stack overflows
2113 * may crash the runtime
2115 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2116 if (!jit_tls->handling_stack_ovf) {
2117 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2118 jit_tls->handling_stack_ovf = 1;
2120 /*fprintf (stderr, "Already handling stack overflow\n");*/
2129 MonoMethod *omethod;
2131 } PrintOverflowUserData;
2133 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2135 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2137 MonoMethod *method = NULL;
2138 PrintOverflowUserData *user_data = data;
2142 method = jinfo_get_method (frame->ji);
2145 if (user_data->count == 0) {
2146 /* The first frame is in its prolog, so a line number cannot be computed */
2147 user_data->count ++;
2151 /* If this is a one method overflow, skip the other instances */
2152 if (method == user_data->omethod)
2155 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2156 mono_runtime_printf_err (" %s", location);
2159 if (user_data->count == 1) {
2160 mono_runtime_printf_err (" <...>");
2161 user_data->omethod = method;
2163 user_data->omethod = NULL;
2166 user_data->count ++;
2168 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2175 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2177 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2178 PrintOverflowUserData ud;
2182 /* we don't do much now, but we can warn the user with a useful message */
2183 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2185 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2186 mono_arch_sigctx_to_monoctx (ctx, &mctx);
2188 mono_runtime_printf_err ("Stacktrace:");
2190 memset (&ud, 0, sizeof (ud));
2192 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2194 if (ji && jinfo_get_method (ji))
2195 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2197 mono_runtime_printf_err ("At <unmanaged>.");
2204 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2206 MonoMethod *method = NULL;
2209 method = jinfo_get_method (frame->ji);
2212 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2213 mono_runtime_printf_err (" %s", location);
2216 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2221 static G_GNUC_UNUSED gboolean
2222 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2224 GString *p = (GString*)data;
2225 MonoMethod *method = NULL;
2228 method = jinfo_get_method (frame->ji);
2230 if (method && frame->domain) {
2231 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2232 g_string_append_printf (p, " %s\n", location);
2235 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2240 #ifndef MONO_CROSS_COMPILE
2242 static gboolean handling_sigsegv = FALSE;
2245 * mono_handle_native_sigsegv:
2247 * Handle a SIGSEGV received while in native code by printing diagnostic
2248 * information and aborting.
2251 mono_handle_native_sigsegv (int signal, void *ctx)
2253 #ifdef MONO_ARCH_USE_SIGACTION
2254 struct sigaction sa;
2256 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2257 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2259 if (handling_sigsegv)
2262 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2263 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2274 /* To prevent infinite loops when the stack walk causes a crash */
2275 handling_sigsegv = TRUE;
2277 /* !jit_tls means the thread was not registered with the runtime */
2278 if (jit_tls && mono_thread_internal_current ()) {
2279 mono_runtime_printf_err ("Stacktrace:\n");
2281 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2284 #ifdef HAVE_BACKTRACE_SYMBOLS
2290 mono_runtime_printf_err ("\nNative stacktrace:\n");
2292 size = backtrace (array, 256);
2293 names = backtrace_symbols (array, size);
2294 for (i =0; i < size; ++i) {
2295 mono_runtime_printf_err ("\t%s", names [i]);
2299 /* Try to get more meaningful information using gdb */
2301 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2302 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2303 /* From g_spawn_command_line_sync () in eglib */
2306 pid_t crashed_pid = getpid ();
2310 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2311 * it will deadlock. Call the syscall directly instead.
2313 pid = mono_runtime_syscall_fork ();
2316 dup2 (STDERR_FILENO, STDOUT_FILENO);
2318 mono_gdb_render_native_backtraces (crashed_pid);
2322 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2323 waitpid (pid, &status, 0);
2330 * A SIGSEGV indicates something went very wrong so we can no longer depend
2331 * on anything working. So try to print out lots of diagnostics, starting
2332 * with ones which have a greater chance of working.
2334 mono_runtime_printf_err (
2336 "=================================================================\n"
2337 "Got a %s while executing native code. This usually indicates\n"
2338 "a fatal error in the mono runtime or one of the native libraries \n"
2339 "used by your application.\n"
2340 "=================================================================\n",
2344 #ifdef MONO_ARCH_USE_SIGACTION
2346 /* Remove our SIGABRT handler */
2347 sa.sa_handler = SIG_DFL;
2348 sigemptyset (&sa.sa_mask);
2351 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2355 if (!mono_do_crash_chaining) {
2356 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2357 #if defined (PLATFORM_ANDROID)
2368 mono_handle_native_sigsegv (int signal, void *ctx)
2370 g_assert_not_reached ();
2373 #endif /* !MONO_CROSS_COMPILE */
2376 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2378 MonoInternalThread *thread = mono_thread_internal_current ();
2379 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2382 GString* text = g_string_new (0);
2387 GError *error = NULL;
2390 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2392 g_string_append_printf (text, "\n\"%s\"", name);
2395 else if (thread->threadpool_thread)
2396 g_string_append (text, "\n\"<threadpool thread>\"");
2398 g_string_append (text, "\n\"<unnamed thread>\"");
2401 wapi_desc = wapi_current_thread_desc ();
2402 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2406 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2408 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2410 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2412 mono_arch_sigctx_to_monoctx (sigctx, &ctx);
2414 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2416 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2419 mono_runtime_printf ("%s", text->str);
2421 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2422 OutputDebugStringA(text->str);
2425 g_string_free (text, TRUE);
2426 mono_runtime_stdout_fflush ();
2430 * mono_print_thread_dump:
2432 * Print information about the current thread to stdout.
2433 * SIGCTX can be NULL, allowing this to be called from gdb.
2436 mono_print_thread_dump (void *sigctx)
2438 mono_print_thread_dump_internal (sigctx, NULL);
2442 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2444 mono_print_thread_dump_internal (NULL, ctx);
2448 * mono_resume_unwind:
2450 * This is called by a trampoline from LLVM compiled finally clauses to continue
2454 mono_resume_unwind (MonoContext *ctx)
2456 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2457 MonoContext new_ctx;
2459 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2460 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2463 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2465 mono_restore_context (&new_ctx);
2468 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2473 MonoJitExceptionInfo *ei;
2474 } FindHandlerBlockData;
2477 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2481 FindHandlerBlockData *pdata = data;
2482 MonoJitInfo *ji = frame->ji;
2487 ip = MONO_CONTEXT_GET_IP (ctx);
2489 for (i = 0; i < ji->num_clauses; ++i) {
2490 MonoJitExceptionInfo *ei = ji->clauses + i;
2491 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2493 /*If ip points to the first instruction it means the handler block didn't start
2494 so we can leave its execution to the EH machinery*/
2495 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2507 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2510 MonoJitExceptionInfo *clause = NULL;
2513 ip = MONO_CONTEXT_GET_IP (ctx);
2515 for (i = 0; i < ji->num_clauses; ++i) {
2516 clause = &ji->clauses [i];
2517 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2519 if (clause->handler_start < ip && clause->data.handler_end > ip)
2523 /*no matching finally */
2524 if (i == ji->num_clauses)
2527 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2528 if (ip == clause->handler_start)
2531 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2535 * Finds the bottom handler block running and install a block guard if needed.
2536 * FIXME add full-aot support.
2539 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2541 FindHandlerBlockData data = { 0 };
2542 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2549 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2550 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2552 if (!jit_tls || jit_tls->handler_block_return_address)
2555 /* Do an async safe stack walk */
2556 mono_thread_info_set_is_async_context (TRUE);
2557 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2558 mono_thread_info_set_is_async_context (FALSE);
2563 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2565 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2566 if (resume_ip == NULL)
2569 jit_tls->handler_block_return_address = resume_ip;
2570 jit_tls->handler_block = data.ei;
2577 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2585 mono_set_cast_details (MonoClass *from, MonoClass *to)
2587 MonoJitTlsData *jit_tls = NULL;
2589 if (mini_get_debug_options ()->better_cast_details) {
2590 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2591 jit_tls->class_cast_from = from;
2592 jit_tls->class_cast_to = to;
2597 /*returns false if the thread is not attached*/
2599 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2601 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2602 MonoInternalThread *thread = mono_thread_internal_current ();
2603 if (!thread || !thread->jit_data) {
2609 mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx);
2611 #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE)
2612 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2614 g_error ("Use a null sigctx requires a working mono-context");
2617 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2618 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2619 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2623 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2629 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2631 MonoInternalThread *thread = mono_thread_internal_current ();
2632 if (!thread || !thread->jit_data) {
2638 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2639 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2640 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2645 /*returns false if the thread is not attached*/
2647 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2649 MonoInternalThread *thread = mono_thread_internal_current ();
2650 MONO_ARCH_CONTEXT_DEF
2652 mono_arch_flush_register_windows ();
2654 if (!thread || !thread->jit_data) {
2658 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2659 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2661 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2664 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2665 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2666 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2672 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2674 mono_handle_exception (ctx, exc);
2675 mono_restore_context (ctx);
2678 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2680 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2682 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2683 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2684 jit_tls->ex_ctx = *ctx;
2686 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2688 g_error ("This target doesn't support mono_arch_setup_async_callback");
2693 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2695 unhandled_exception_hook = func;
2696 unhandled_exception_hook_data = user_data;
2700 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2702 if (unhandled_exception_hook) {
2703 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2705 MonoObject *other = NULL;
2706 MonoString *str = mono_object_to_string (exc, &other);
2710 msg = mono_string_to_utf8 (str);
2712 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2713 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2715 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2716 original_backtrace, nested_backtrace);
2718 g_free (original_backtrace);
2719 g_free (nested_backtrace);
2721 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2723 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2725 #if defined(__APPLE__) && defined(__arm__)
2726 g_assertion_message ("Terminating runtime due to unhandled exception");
2728 exit (mono_environment_exitcode_get ());
2732 g_assert_not_reached ();
2736 * mono_restore_context:
2738 * Call the architecture specific restore context function.
2741 mono_restore_context (MonoContext *ctx)
2743 static void (*restore_context) (MonoContext *);
2745 if (!restore_context)
2746 restore_context = mono_get_restore_context ();
2747 restore_context (ctx);
2748 g_assert_not_reached ();
2752 * mono_jinfo_get_unwind_info:
2754 * Return the unwind info for JI.
2757 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2760 return mono_aot_get_unwind_info (ji, unwind_info_len);
2762 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2766 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2768 MonoArchEHJitInfo *info;
2770 info = mono_jit_info_get_arch_eh_info (ji);
2773 return info->epilog_size;