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).
21 #ifdef HAVE_EXECINFO_H
25 #ifdef HAVE_SYS_TYPES_H
26 #include <sys/types.h>
29 #ifdef HAVE_SYS_WAIT_H
37 #ifdef HAVE_SYS_SYSCALL_H
38 #include <sys/syscall.h>
41 #ifdef HAVE_SYS_PRCTL_H
42 #include <sys/prctl.h>
45 #include <mono/metadata/appdomain.h>
46 #include <mono/metadata/tabledefs.h>
47 #include <mono/metadata/threads.h>
48 #include <mono/metadata/threads-types.h>
49 #include <mono/metadata/debug-helpers.h>
50 #include <mono/metadata/exception.h>
51 #include <mono/metadata/gc-internal.h>
52 #include <mono/metadata/mono-debug.h>
53 #include <mono/metadata/profiler.h>
54 #include <mono/metadata/mono-endian.h>
55 #include <mono/metadata/environment.h>
56 #include <mono/metadata/mono-mlist.h>
57 #include <mono/utils/mono-mmap.h>
58 #include <mono/utils/mono-logger-internal.h>
62 #include "debugger-agent.h"
63 #include "seq-points.h"
65 #ifdef ENABLE_EXTENSION_MODULE
66 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
69 #ifndef MONO_ARCH_CONTEXT_DEF
70 #define MONO_ARCH_CONTEXT_DEF
73 static gpointer restore_context_func, call_filter_func;
74 static gpointer throw_exception_func, rethrow_exception_func;
75 static gpointer throw_corlib_exception_func;
77 static gpointer try_more_restore_tramp = NULL;
78 static gpointer restore_stack_protection_tramp = NULL;
80 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
81 static gpointer unhandled_exception_hook_data = NULL;
83 static void try_more_restore (void);
84 static void restore_stack_protection (void);
85 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
86 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
87 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
90 mono_exceptions_init (void)
92 MonoRuntimeExceptionHandlingCallbacks cbs;
94 restore_context_func = mono_aot_get_trampoline ("restore_context");
95 call_filter_func = mono_aot_get_trampoline ("call_filter");
96 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
97 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
101 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
102 mono_tramp_info_register (info, NULL);
103 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
104 mono_tramp_info_register (info, NULL);
105 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
106 mono_tramp_info_register (info, NULL);
107 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
108 mono_tramp_info_register (info, NULL);
110 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
111 if (!mono_llvm_only) {
112 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
113 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
117 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
118 mono_arch_exceptions_init ();
120 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
121 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
122 cbs.mono_raise_exception = mono_get_throw_exception ();
123 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
124 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
125 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
126 mono_install_eh_callbacks (&cbs);
130 mono_get_throw_exception (void)
132 g_assert (throw_exception_func);
133 return throw_exception_func;
137 mono_get_rethrow_exception (void)
139 g_assert (rethrow_exception_func);
140 return rethrow_exception_func;
144 mono_get_call_filter (void)
146 g_assert (call_filter_func);
147 return call_filter_func;
151 mono_get_restore_context (void)
153 g_assert (restore_context_func);
154 return restore_context_func;
158 mono_get_throw_corlib_exception (void)
160 gpointer code = NULL;
163 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
164 if (throw_corlib_exception_func)
165 return throw_corlib_exception_func;
168 code = mono_aot_get_trampoline ("throw_corlib_exception");
170 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
171 mono_tramp_info_register (info, NULL);
174 mono_memory_barrier ();
176 throw_corlib_exception_func = code;
178 return throw_corlib_exception_func;
182 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
184 MonoTryBlockHoleTableJitInfo *table;
189 if (ei->try_start > ip || ip >= ei->try_end)
192 if (!ji->has_try_block_holes)
195 table = mono_jit_info_get_try_block_hole_table_info (ji);
196 offset = (guint32)((char*)ip - (char*)ji->code_start);
197 clause = (guint16)(ei - ji->clauses);
198 g_assert (clause < ji->num_clauses);
200 for (i = 0; i < table->num_holes; ++i) {
201 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
202 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
211 * Translate between the mono_arch_unwind_frame function and the old API.
214 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
215 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
217 StackFrameInfo frame;
220 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
222 /* Avoid costly table lookup during stack overflow */
223 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
226 ji = mini_jit_info_table_find (domain, ip, NULL);
231 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
235 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
237 * Remove any unused lmf.
238 * Mask out the lower bits which might be used to hold additional information.
240 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
243 /* Convert between the new and the old APIs */
244 switch (frame.type) {
245 case FRAME_TYPE_MANAGED:
249 case FRAME_TYPE_TRAMPOLINE:
251 case FRAME_TYPE_MANAGED_TO_NATIVE:
255 memset (res, 0, sizeof (MonoJitInfo));
256 res->d.method = frame.method;
259 case FRAME_TYPE_DEBUGGER_INVOKE: {
263 * The normal exception handling code can't handle this frame, so just
266 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
267 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
271 g_assert_not_reached ();
276 /* mono_find_jit_info:
278 * This function is used to gather information from @ctx. It return the
279 * MonoJitInfo of the corresponding function, unwinds one stack frame and
280 * stores the resulting context into @new_ctx. It also stores a string
281 * describing the stack location into @trace (if not NULL), and modifies
282 * the @lmf if necessary. @native_offset return the IP offset from the
283 * start of the function or -1 if that info is not available.
286 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
287 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
291 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
293 MonoMethod *method = NULL;
304 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
306 if (ji == (gpointer)-1)
309 if (ji && !ji->is_trampoline)
310 method = jinfo_get_method (ji);
312 if (managed2 || (method && method->wrapper_type)) {
313 const char *real_ip, *start;
316 start = (const char *)ji->code_start;
318 /* ctx->ip points into native code */
319 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
321 real_ip = (const char*)ip;
323 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
324 offset = real_ip - start;
329 *native_offset = offset;
332 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
336 *trace = mono_debug_print_stack_frame (method, offset, domain);
339 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
340 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
349 * mono_find_jit_info_ext:
351 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
353 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
354 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
355 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
356 * to obtain the last managed frame.
357 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
358 * On return, it will be filled with the locations where callee saved registers are saved
359 * by the current frame. This is returned outside of StackFrameInfo because it can be
360 * quite large on some platforms.
361 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
365 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
366 MonoJitInfo *prev_ji, MonoContext *ctx,
367 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
368 mgreg_t **save_locations,
369 StackFrameInfo *frame)
372 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
374 MonoDomain *target_domain = domain;
375 MonoMethod *method = NULL;
376 gboolean async = mono_thread_info_is_async_context ();
381 /* Avoid costly table lookup during stack overflow */
382 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
385 ji = mini_jit_info_table_find (domain, ip, &target_domain);
388 target_domain = domain;
391 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
393 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
397 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
399 * Remove any unused lmf.
400 * Mask out the lower bits which might be used to hold additional information.
402 *lmf = (gpointer)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
405 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
406 method = jinfo_get_method (frame->ji);
408 if (frame->type == FRAME_TYPE_MANAGED && method) {
409 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
410 frame->managed = TRUE;
413 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
415 * This type of frame is just a marker, the caller should unwind once more to get the
416 * last managed frame.
419 frame->method = NULL;
422 frame->native_offset = -1;
423 frame->domain = target_domain;
424 frame->async_context = async;
428 if (frame->type == FRAME_TYPE_MANAGED)
429 frame->method = method;
431 if (ji && (frame->managed || (method && method->wrapper_type))) {
432 const char *real_ip, *start;
434 start = (const char *)ji->code_start;
436 /* ctx->ip points into native code */
437 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
439 real_ip = (const char*)ip;
441 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
442 frame->native_offset = real_ip - start;
444 frame->native_offset = -1;
447 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
449 if (trace && frame->method) {
450 char *fname = mono_method_full_name (frame->method, TRUE);
451 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
460 * This function is async-safe.
463 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
465 MonoGenericJitInfo *gi;
469 if (!ji->has_generic_jit_info)
471 gi = mono_jit_info_get_generic_jit_info (ji);
477 * Search location list if available, it contains the precise location of the
478 * argument for every pc offset, even if the method was interrupted while it was in
482 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
485 for (i = 0; i < gi->nlocs; ++i) {
486 MonoDwarfLocListEntry *entry = &gi->locations [i];
488 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
490 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
492 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
496 g_assert (i < gi->nlocs);
499 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
501 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
505 method = jinfo_get_method (ji);
506 if (mono_method_get_context (method)->method_inst) {
508 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
511 /* Avoid returning a managed object */
512 MonoObject *this_obj = info;
514 return this_obj->vtable->klass;
518 static MonoGenericContext
519 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
521 MonoGenericContext context = { NULL, NULL };
522 MonoClass *klass, *method_container_class;
525 g_assert (generic_info);
527 method = jinfo_get_method (ji);
528 g_assert (method->is_inflated);
529 if (mono_method_get_context (method)->method_inst) {
530 MonoMethodRuntimeGenericContext *mrgctx = generic_info;
532 klass = mrgctx->class_vtable->klass;
533 context.method_inst = mrgctx->method_inst;
534 g_assert (context.method_inst);
535 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
536 MonoVTable *vtable = generic_info;
538 klass = vtable->klass;
540 klass = generic_info;
543 //g_assert (!method->klass->generic_container);
544 if (method->klass->generic_class)
545 method_container_class = method->klass->generic_class->container_class;
547 method_container_class = method->klass;
549 /* class might refer to a subclass of method's class */
550 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
551 klass = klass->parent;
555 if (klass->generic_class || klass->generic_container)
556 context.class_inst = mini_class_get_context (klass)->class_inst;
558 if (klass->generic_class)
559 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
561 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
567 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
570 MonoGenericContext context;
573 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
574 return jinfo_get_method (ji);
575 context = get_generic_context_from_stack_frame (ji, generic_info);
577 method = jinfo_get_method (ji);
578 method = mono_method_get_declaring_generic_method (method);
579 method = mono_class_inflate_generic_method_checked (method, &context, &error);
580 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
586 * mono_exception_walk_native_trace:
587 * @ex: The exception object whose frames should be walked
588 * @func: callback to call for each stack frame
589 * @user_data: data passed to the callback
591 * This function walks the stacktrace of an exception. For
592 * each frame the callback function is called with the relevant info.
593 * The walk ends when no more stack frames are found or when the callback
594 * returns a TRUE value.
598 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
600 MonoDomain *domain = mono_domain_get ();
601 MonoArray *ta = ex->trace_ips;
607 len = mono_array_length (ta) >> 1;
608 for (i = 0; i < len; i++) {
609 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
610 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
611 MonoJitInfo *ji = mono_jit_info_table_find (domain, ip);
614 if (func (NULL, ip, 0, FALSE, user_data))
617 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
618 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
627 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
629 MonoDomain *domain = mono_domain_get ();
631 MonoArray *ta = exc->trace_ips;
632 MonoDebugSourceLocation *location;
636 /* Exception is not thrown yet */
637 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
640 len = mono_array_length (ta) >> 1;
642 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
644 for (i = skip; i < len; i++) {
646 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
647 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
648 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
651 ji = mono_jit_info_table_find (domain, ip);
653 /* Unmanaged frame */
654 mono_array_setref (res, i, sf);
658 g_assert (ji != NULL);
660 method = get_method_from_stack_frame (ji, generic_info);
661 if (jinfo_get_method (ji)->wrapper_type) {
665 s = mono_method_get_name_full (method, TRUE, MONO_TYPE_NAME_FORMAT_REFLECTION);
666 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
670 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
672 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
673 sf->method_address = (gsize) ji->code_start;
674 sf->native_offset = (char *)ip - (char *)ji->code_start;
677 * mono_debug_lookup_source_location() returns both the file / line number information
678 * and the IL offset. Note that computing the IL offset is already an expensive
679 * operation, so we shouldn't call this method twice.
681 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
683 sf->il_offset = location->il_offset;
686 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
687 sf->il_offset = sp.il_offset;
692 if (need_file_info) {
693 if (location && location->source_file) {
694 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
695 sf->line = location->row;
696 sf->column = location->column;
698 sf->line = sf->column = 0;
703 mono_debug_free_source_location (location);
704 mono_array_setref (res, i, sf);
711 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
714 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
715 if (jit_tls && jit_tls->orig_ex_ctx_set)
716 start_ctx = &jit_tls->orig_ex_ctx;
718 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
721 * mono_walk_stack_with_ctx:
723 * Unwind the current thread starting at @start_ctx.
725 * If @start_ctx is null, we capture the current context.
728 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
730 MonoContext extra_ctx;
731 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
732 MONO_ARCH_CONTEXT_DEF
734 if (!thread || !thread->jit_data)
738 mono_arch_flush_register_windows ();
740 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
741 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
743 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
745 start_ctx = &extra_ctx;
748 mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data);
752 * mono_walk_stack_with_state:
754 * Unwind a thread described by @state.
756 * State must be valid (state->valid == TRUE).
758 * If you are using this function to unwind another thread, make sure it is suspended.
760 * If @state is null, we capture the current context.
763 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
765 MonoThreadUnwindState extra_state;
767 g_assert (!mono_thread_info_is_async_context ());
768 if (!mono_thread_state_init_from_current (&extra_state))
770 state = &extra_state;
773 g_assert (state->valid);
775 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
779 mono_walk_stack_full (func,
781 state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
782 state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
783 state->unwind_data [MONO_UNWIND_DATA_LMF],
784 unwind_options, user_data);
788 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
790 MonoThreadUnwindState state;
791 if (!mono_thread_state_init_from_current (&state))
793 mono_walk_stack_with_state (func, &state, options, user_data);
797 * mono_walk_stack_full:
798 * @func: callback to call for each stack frame
799 * @domain: starting appdomain, can be NULL to use the current domain
800 * @unwind_options: what extra information the unwinder should gather
801 * @start_ctx: starting state of the stack walk, can be NULL.
802 * @thread: the thread whose stack to walk, can be NULL to use the current thread
803 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
804 * @user_data: data passed to the callback
806 * This function walks the stack of a thread, starting from the state
807 * represented by start_ctx. For each frame the callback
808 * function is called with the relevant info. The walk ends when no more
809 * managed stack frames are found or when the callback returns a TRUE value.
812 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
815 MonoContext ctx, new_ctx;
816 StackFrameInfo frame;
818 mgreg_t *reg_locations [MONO_MAX_IREGS];
819 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
820 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
821 gboolean async = mono_thread_info_is_async_context ();
823 g_assert (start_ctx);
826 /*The LMF will be null if the target have no managed frames.*/
827 /* g_assert (lmf); */
830 g_assert (unwind_options == MONO_UNWIND_NONE);
832 memcpy (&ctx, start_ctx, sizeof (MonoContext));
833 memset (reg_locations, 0, sizeof (reg_locations));
835 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
837 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
841 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
842 MonoDebugSourceLocation *source;
844 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
846 il_offset = source->il_offset;
849 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
850 il_offset = sp.il_offset;
854 mono_debug_free_source_location (source);
858 frame.il_offset = il_offset;
860 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
861 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
863 frame.actual_method = frame.method;
866 if (get_reg_locations)
867 frame.reg_locations = reg_locations;
869 if (func (&frame, &ctx, user_data))
872 if (get_reg_locations) {
873 for (i = 0; i < MONO_MAX_IREGS; ++i)
874 if (new_reg_locations [i])
875 reg_locations [i] = new_reg_locations [i];
883 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
884 MonoReflectionMethod **method,
885 gint32 *iloffset, gint32 *native_offset,
886 MonoString **file, gint32 *line, gint32 *column)
888 MonoDomain *domain = mono_domain_get ();
889 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
890 MonoLMF *lmf = mono_get_lmf ();
891 MonoJitInfo *ji = NULL;
892 MonoContext ctx, new_ctx;
893 MonoDebugSourceLocation *location;
894 MonoMethod *jmethod = NULL, *actual_method;
895 StackFrameInfo frame;
898 MONO_ARCH_CONTEXT_DEF;
900 mono_arch_flush_register_windows ();
902 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
903 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
905 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
911 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
915 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
916 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
917 frame.type == FRAME_TYPE_TRAMPOLINE)
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);
957 glist_to_array (GList *list, MonoClass *eclass)
959 MonoDomain *domain = mono_domain_get ();
966 len = g_list_length (list);
967 res = mono_array_new (domain, eclass, len);
969 for (i = 0; list; list = list->next, i++)
970 mono_array_set (res, gpointer, i, list->data);
976 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
978 MonoClass *catch_class = ei->data.catch_class;
979 MonoType *inflated_type;
980 MonoGenericContext context;
982 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
983 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
986 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
988 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
990 /* FIXME: we shouldn't inflate but instead put the
991 type in the rgctx and fetch it from there. It
992 might be a good idea to do this lazily, i.e. only
993 when the exception is actually thrown, so as not to
994 waste space for exception clauses which might never
996 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
997 catch_class = mono_class_from_mono_type (inflated_type);
998 mono_metadata_free_type (inflated_type);
1004 * mini_jit_info_table_find_ext:
1006 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1007 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1008 * OUT_DOMAIN if it is not NULL.
1011 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1014 MonoInternalThread *t = mono_thread_internal_current ();
1020 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1023 *out_domain = domain;
1027 /* maybe it is shared code, so we also search in the root domain */
1028 if (domain != mono_get_root_domain ()) {
1029 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1032 *out_domain = mono_get_root_domain ();
1040 refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL;
1041 for (; refs && *refs; refs++) {
1042 if (*refs != domain && *refs != mono_get_root_domain ()) {
1043 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1046 *out_domain = (MonoDomain*) *refs;
1056 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1058 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1062 * wrap_non_exception_throws:
1064 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1065 * WrapNonExceptionThrows flag set.
1068 wrap_non_exception_throws (MonoMethod *m)
1070 MonoAssembly *ass = m->klass->image->assembly;
1071 MonoCustomAttrInfo* attrs;
1072 static MonoClass *klass;
1074 gboolean val = FALSE;
1077 if (ass->wrap_non_exception_throws_inited)
1078 return ass->wrap_non_exception_throws;
1080 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1082 attrs = mono_custom_attrs_from_assembly (ass);
1084 for (i = 0; i < attrs->num_attrs; ++i) {
1085 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1087 int num_named, named_type, name_len;
1090 if (!attr->ctor || attr->ctor->klass != klass)
1092 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1093 p = (const char*)attr->data;
1094 g_assert (read16 (p) == 0x0001);
1096 num_named = read16 (p);
1102 /* data_type = *p; */
1105 if (named_type != 0x54)
1107 name_len = mono_metadata_decode_blob_size (p, &p);
1108 name = g_malloc (name_len + 1);
1109 memcpy (name, p, name_len);
1110 name [name_len] = 0;
1112 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1114 /* The value is a BOOLEAN */
1117 mono_custom_attrs_free (attrs);
1120 ass->wrap_non_exception_throws = val;
1121 mono_memory_barrier ();
1122 ass->wrap_non_exception_throws_inited = TRUE;
1127 #ifndef MONO_ARCH_STACK_GROWS_UP
1128 #define DOES_STACK_GROWS_UP 1
1130 #define DOES_STACK_GROWS_UP 0
1133 #define MAX_UNMANAGED_BACKTRACE 128
1135 build_native_trace (void)
1137 /* This puppy only makes sense on mobile, IOW, ARM. */
1138 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1140 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1141 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1146 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1148 for (i = 0; i < size; i++)
1149 mono_array_set (res, gpointer, i, native_trace [i]);
1157 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1159 if (mono_ex && !initial_trace_ips) {
1160 *trace_ips = g_list_reverse (*trace_ips);
1161 MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (*trace_ips, mono_defaults.int_class));
1162 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1163 if (dynamic_methods) {
1164 /* These methods could go away anytime, so save a reference to them in the exception object */
1166 MonoMList *list = NULL;
1168 for (l = dynamic_methods; l; l = l->next) {
1170 MonoDomain *domain = mono_domain_get ();
1172 if (domain->method_to_dyn_method) {
1173 mono_domain_lock (domain);
1174 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1175 mono_domain_unlock (domain);
1177 MonoObject *o = mono_gchandle_get_target (dis_link);
1179 list = mono_mlist_prepend (list, o);
1185 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1188 g_list_free (*trace_ips);
1193 * mono_handle_exception_internal_first_pass:
1195 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1196 * OBJ is found. Run the index of the filter clause which caught the exception into
1197 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1200 mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1202 MonoDomain *domain = mono_domain_get ();
1203 MonoJitInfo *ji = NULL;
1204 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1205 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1206 MonoLMF *lmf = mono_get_lmf ();
1207 MonoArray *initial_trace_ips = NULL;
1208 GList *trace_ips = NULL;
1209 GSList *dynamic_methods = NULL;
1210 MonoException *mono_ex;
1211 gboolean stack_overflow = FALSE;
1212 MonoContext initial_ctx;
1214 int frame_count = 0;
1219 g_assert (ctx != NULL);
1221 if (obj == domain->stack_overflow_ex)
1222 stack_overflow = TRUE;
1224 mono_ex = (MonoException*)obj;
1225 initial_trace_ips = mono_ex->trace_ips;
1227 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1228 mono_ex = (MonoException*)obj;
1229 initial_trace_ips = mono_ex->trace_ips;
1235 call_filter = mono_get_call_filter ();
1237 g_assert (jit_tls->end_of_stack);
1238 g_assert (jit_tls->abort_func);
1241 *out_filter_idx = -1;
1245 *out_prev_ji = NULL;
1250 MonoContext new_ctx;
1252 int clause_index_start = 0;
1253 gboolean unwind_res = TRUE;
1255 StackFrameInfo frame;
1260 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1262 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1263 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1264 frame.type == FRAME_TYPE_TRAMPOLINE) {
1268 g_assert (frame.type == FRAME_TYPE_MANAGED);
1273 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1274 g_slist_free (dynamic_methods);
1279 method = jinfo_get_method (ji);
1280 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1282 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1283 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1284 "The native frame called the managed method:\n%s\n",
1285 mono_method_full_name (method, TRUE));
1288 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1290 * Avoid overwriting the stack trace if the exception is
1291 * rethrown. Also avoid giant stack traces during a stack
1294 if (!initial_trace_ips && (frame_count < 1000)) {
1295 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1296 trace_ips = g_list_prepend (trace_ips,
1297 get_generic_info_from_stack_frame (ji, ctx));
1301 if (method->dynamic)
1302 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1304 if (stack_overflow) {
1305 if (DOES_STACK_GROWS_UP)
1306 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1308 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1310 free_stack = 0xffffff;
1313 for (i = clause_index_start; i < ji->num_clauses; i++) {
1314 MonoJitExceptionInfo *ei = &ji->clauses [i];
1315 gboolean filtered = FALSE;
1318 * During stack overflow, wait till the unwinding frees some stack
1319 * space before running handlers/finalizers.
1321 if (free_stack <= (64 * 1024))
1324 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1326 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1329 * Have to unwrap RuntimeWrappedExceptions if the
1330 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1332 if (non_exception && !wrap_non_exception_throws (method))
1333 ex_obj = non_exception;
1337 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1338 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1339 #ifndef DISABLE_PERFCOUNTERS
1340 mono_perfcounters->exceptions_filters++;
1343 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1344 trim the stackframe since if it returns FALSE we lose information.
1346 FIXME Not 100% sure if it's a good idea even with user clauses.
1349 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1351 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1353 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1355 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1356 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1358 g_assert (!ji->from_llvm);
1359 /* store the exception object in bp + ei->exvar_offset */
1360 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1363 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1365 * Pass the original il clause index to the landing pad so it can
1366 * branch to the landing pad associated with the il clause.
1367 * This is needed because llvm compiled code assumes that the EH
1368 * code always branches to the innermost landing pad.
1371 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1374 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1375 filtered = call_filter (ctx, ei->data.filter);
1376 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1377 if (filtered && out_filter_idx)
1378 *out_filter_idx = filter_idx;
1385 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1386 g_slist_free (dynamic_methods);
1387 /* mono_debugger_agent_handle_exception () needs this */
1388 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1393 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1394 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1395 g_slist_free (dynamic_methods);
1400 /* mono_debugger_agent_handle_exception () needs this */
1401 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1410 g_assert_not_reached ();
1414 * mono_handle_exception_internal:
1415 * @ctx: saved processor state
1416 * @obj: the exception object
1417 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1420 mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji)
1422 MonoDomain *domain = mono_domain_get ();
1423 MonoJitInfo *ji, *prev_ji;
1424 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1425 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1426 MonoLMF *lmf = mono_get_lmf ();
1427 MonoException *mono_ex;
1428 gboolean stack_overflow = FALSE;
1429 MonoContext initial_ctx;
1431 int frame_count = 0;
1432 gint32 filter_idx, first_filter_idx = 0;
1435 MonoObject *non_exception = NULL;
1437 g_assert (ctx != NULL);
1439 MonoException *ex = mono_get_exception_null_reference ();
1440 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1441 obj = (MonoObject *)ex;
1445 * Allocate a new exception object instead of the preconstructed ones.
1447 if (obj == domain->stack_overflow_ex) {
1449 * It is not a good idea to try and put even more pressure on the little stack available.
1450 * obj = mono_get_exception_stack_overflow ();
1452 stack_overflow = TRUE;
1454 else if (obj == domain->null_reference_ex) {
1455 obj = mono_get_exception_null_reference ();
1458 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1459 non_exception = obj;
1460 obj = mono_get_exception_runtime_wrapped (obj);
1463 mono_ex = (MonoException*)obj;
1465 if (mini_get_debug_options ()->suspend_on_exception) {
1466 mono_runtime_printf_err ("Exception thrown, suspending...");
1471 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1472 mono_ex = (MonoException*)obj;
1477 if (mono_ex && jit_tls->class_cast_from) {
1478 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1479 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1480 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1481 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1482 mono_ex->message = mono_string_new (domain, msg);
1487 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1488 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1489 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1490 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1491 mono_ex->message = mono_string_new (domain, msg);
1499 call_filter = mono_get_call_filter ();
1501 g_assert (jit_tls->end_of_stack);
1502 g_assert (jit_tls->abort_func);
1505 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1506 * end up being TRUE on any code path.
1508 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1513 MonoContext ctx_cp = *ctx;
1514 if (mono_trace_is_enabled ()) {
1515 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1516 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1517 MonoObject *message;
1518 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1520 MonoObject *exc = NULL;
1521 if (get_message == NULL) {
1523 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1525 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1527 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1531 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1533 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1535 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1536 mono_print_thread_dump_from_ctx (ctx);
1538 jit_tls->orig_ex_ctx_set = TRUE;
1539 mono_profiler_exception_thrown (obj);
1540 jit_tls->orig_ex_ctx_set = FALSE;
1542 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1545 if (mini_get_debug_options ()->break_on_exc)
1547 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1549 if (mini_get_debug_options ()->suspend_on_unhandled) {
1550 mono_runtime_printf_err ("Unhandled exception, suspending...");
1555 // FIXME: This runs managed code so it might cause another stack overflow when
1556 // we are handling a stack overflow
1557 mono_unhandled_exception (obj);
1559 gboolean unhandled = FALSE;
1562 * The exceptions caught by the mono_runtime_invoke () calls
1563 * in the threadpool needs to be treated as unhandled (#669836).
1565 * FIXME: The check below is hackish, but its hard to distinguish
1566 * these runtime invoke calls from others in the runtime.
1568 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1569 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1574 mono_debugger_agent_handle_exception (obj, ctx, NULL);
1576 mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp);
1586 MonoContext new_ctx;
1588 int clause_index_start = 0;
1589 gboolean unwind_res = TRUE;
1593 ji = jit_tls->resume_state.ji;
1594 new_ctx = jit_tls->resume_state.new_ctx;
1595 clause_index_start = jit_tls->resume_state.clause_index;
1596 lmf = jit_tls->resume_state.lmf;
1597 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1598 filter_idx = jit_tls->resume_state.filter_idx;
1600 StackFrameInfo frame;
1602 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1604 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1605 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1606 frame.type == FRAME_TYPE_TRAMPOLINE) {
1610 g_assert (frame.type == FRAME_TYPE_MANAGED);
1616 *(mono_get_lmf_addr ()) = lmf;
1618 jit_tls->abort_func (obj);
1619 g_assert_not_reached ();
1622 method = jinfo_get_method (ji);
1624 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1626 if (stack_overflow) {
1627 if (DOES_STACK_GROWS_UP)
1628 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1630 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1632 free_stack = 0xffffff;
1635 for (i = clause_index_start; i < ji->num_clauses; i++) {
1636 MonoJitExceptionInfo *ei = &ji->clauses [i];
1637 gboolean filtered = FALSE;
1640 * During stack overflow, wait till the unwinding frees some stack
1641 * space before running handlers/finalizers.
1643 if (free_stack <= (64 * 1024))
1646 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1648 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1651 * Have to unwrap RuntimeWrappedExceptions if the
1652 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1654 if (non_exception && !wrap_non_exception_throws (method))
1655 ex_obj = non_exception;
1659 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1660 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1661 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1663 g_assert (!ji->from_llvm);
1664 /* store the exception object in bp + ei->exvar_offset */
1665 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1669 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1671 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1674 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1676 * Filter clauses should only be run in the
1677 * first pass of exception handling.
1679 filtered = (filter_idx == first_filter_idx);
1683 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1684 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1686 * This guards against the situation that we abort a thread that is executing a finally clause
1687 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1688 * check for this situation here and resume interruption if we are below the guarded block.
1690 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1691 gboolean is_outside = FALSE;
1692 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1693 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1694 //FIXME make this stack direction aware
1695 if (catch_bp > prot_bp) {
1697 } else if (catch_bp == prot_bp) {
1698 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1699 * So we check if the catch handler_start is protected by the guarded handler protected region
1702 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1703 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1704 * There aren't any further finally/fault handler blocks down the stack over this exception.
1705 * This must be ensured by the code that installs the guard trampoline.
1707 g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1709 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1714 jit_tls->handler_block_return_address = NULL;
1715 jit_tls->handler_block = NULL;
1716 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1720 if (mono_trace_is_enabled () && mono_trace_eval (method))
1721 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1722 jit_tls->orig_ex_ctx_set = TRUE;
1723 mono_profiler_exception_clause_handler (method, ei->flags, i);
1724 jit_tls->orig_ex_ctx_set = FALSE;
1725 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1727 #ifndef DISABLE_PERFCOUNTERS
1728 mono_perfcounters->exceptions_depth += frame_count;
1730 if (obj == domain->stack_overflow_ex)
1731 jit_tls->handling_stack_ovf = FALSE;
1735 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1736 if (mono_trace_is_enabled () && mono_trace_eval (method))
1737 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1738 jit_tls->orig_ex_ctx_set = TRUE;
1739 mono_profiler_exception_clause_handler (method, ei->flags, i);
1740 jit_tls->orig_ex_ctx_set = FALSE;
1741 call_filter (ctx, ei->handler_start);
1743 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1744 if (mono_trace_is_enabled () && mono_trace_eval (method))
1745 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1746 jit_tls->orig_ex_ctx_set = TRUE;
1747 mono_profiler_exception_clause_handler (method, ei->flags, i);
1748 jit_tls->orig_ex_ctx_set = FALSE;
1749 #ifndef DISABLE_PERFCOUNTERS
1750 mono_perfcounters->exceptions_finallys++;
1753 if (ji->from_llvm) {
1755 * LLVM compiled finally handlers follow the design
1756 * of the c++ ehabi, i.e. they call a resume function
1757 * at the end instead of returning to the caller.
1758 * So save the exception handling state,
1759 * mono_resume_unwind () will call us again to continue
1762 jit_tls->resume_state.ex_obj = obj;
1763 jit_tls->resume_state.ji = ji;
1764 jit_tls->resume_state.clause_index = i + 1;
1765 jit_tls->resume_state.ctx = *ctx;
1766 jit_tls->resume_state.new_ctx = new_ctx;
1767 jit_tls->resume_state.lmf = lmf;
1768 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1769 jit_tls->resume_state.filter_idx = filter_idx;
1770 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1773 call_filter (ctx, ei->handler_start);
1779 jit_tls->orig_ex_ctx_set = TRUE;
1780 mono_profiler_exception_method_leave (method);
1781 jit_tls->orig_ex_ctx_set = FALSE;
1786 g_assert_not_reached ();
1790 * mono_debugger_run_finally:
1791 * @start_ctx: saved processor state
1793 * This method is called by the Mono Debugger to call all `finally' clauses of the
1794 * current stack frame. It's used when the user issues a `return' command to make
1795 * the current stack frame return. After returning from this method, the debugger
1796 * unwinds the stack one frame and gives control back to the user.
1798 * NOTE: This method is only used when running inside the Mono Debugger.
1801 mono_debugger_run_finally (MonoContext *start_ctx)
1803 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1804 MonoDomain *domain = mono_domain_get ();
1805 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1806 MonoLMF *lmf = mono_get_lmf ();
1807 MonoContext ctx, new_ctx;
1808 MonoJitInfo *ji, rji;
1813 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1814 if (!ji || ji == (gpointer)-1)
1818 call_filter = mono_get_call_filter ();
1820 for (i = 0; i < ji->num_clauses; i++) {
1821 MonoJitExceptionInfo *ei = &ji->clauses [i];
1823 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1824 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1825 call_filter (&ctx, ei->handler_start);
1831 * mono_handle_exception:
1832 * @ctx: saved processor state
1833 * @obj: the exception object
1836 mono_handle_exception (MonoContext *ctx, gpointer obj)
1838 #ifndef DISABLE_PERFCOUNTERS
1839 mono_perfcounters->exceptions_thrown++;
1842 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1845 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1847 #ifndef MONO_ARCH_USE_SIGACTION
1848 #error "Can't use sigaltstack without sigaction"
1851 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1854 mono_setup_altstack (MonoJitTlsData *tls)
1858 guint8 *staddr = NULL;
1860 if (mono_running_on_valgrind ())
1863 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1867 tls->end_of_stack = staddr + stsize;
1868 tls->stack_size = stsize;
1870 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1872 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1873 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1875 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1877 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1878 /* mprotect can fail for the main thread stack */
1879 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);
1880 g_assert (gaddr == tls->stack_ovf_guard_base);
1881 tls->stack_ovf_valloced = TRUE;
1884 /* Setup an alternate signal stack */
1885 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1886 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1888 g_assert (tls->signal_stack);
1890 sa.ss_sp = tls->signal_stack;
1891 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1893 g_assert (sigaltstack (&sa, NULL) == 0);
1895 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);
1899 mono_free_altstack (MonoJitTlsData *tls)
1904 sa.ss_sp = tls->signal_stack;
1905 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1906 sa.ss_flags = SS_DISABLE;
1907 err = sigaltstack (&sa, NULL);
1908 g_assert (err == 0);
1910 if (tls->signal_stack)
1911 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1912 if (tls->stack_ovf_valloced)
1913 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1915 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1918 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1921 mono_setup_altstack (MonoJitTlsData *tls)
1926 mono_free_altstack (MonoJitTlsData *tls)
1930 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1933 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1935 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1936 /* we need to leave some room for throwing the exception */
1937 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1938 unprotect_size -= mono_pagesize ();
1939 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1940 * is sufficient stack
1942 //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);
1944 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1945 return unprotect_size == jit_tls->stack_ovf_guard_size;
1948 static G_GNUC_UNUSED void
1949 try_more_restore (void)
1951 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1952 if (try_restore_stack_protection (jit_tls, 500))
1953 jit_tls->restore_stack_prot = NULL;
1956 static G_GNUC_UNUSED void
1957 restore_stack_protection (void)
1959 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
1960 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1961 /* if we can't restore the stack protection, keep a callback installed so
1962 * we'll try to restore as much stack as we can at each return from unmanaged
1965 if (try_restore_stack_protection (jit_tls, 4096))
1966 jit_tls->restore_stack_prot = NULL;
1968 jit_tls->restore_stack_prot = try_more_restore_tramp;
1969 /* here we also throw a stack overflow exception */
1970 ex->trace_ips = NULL;
1971 ex->stack_trace = NULL;
1972 mono_raise_exception (ex);
1976 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1978 void (*func)(void) = (gpointer)tramp_data;
1984 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
1989 /* we got a stack overflow in the soft-guard pages
1990 * There are two cases:
1991 * 1) managed code caused the overflow: we unprotect the soft-guard page
1992 * and let the arch-specific code trigger the exception handling mechanism
1993 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
1994 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
1995 * and hope we can continue with those enabled, at least until the hard-guard page
1996 * is hit. The alternative to continuing here is to just print a message and abort.
1997 * We may add in the future the code to protect the pages again in the codepath
1998 * when we return from unmanaged to managed code.
2000 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2001 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2002 /* we unprotect the minimum amount we can */
2004 gboolean handled = FALSE;
2006 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2007 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2008 guard_size -= mono_pagesize ();
2010 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2011 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2012 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);
2013 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2015 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2020 /* We print a message: after this even managed stack overflows
2021 * may crash the runtime
2023 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2024 if (!jit_tls->handling_stack_ovf) {
2025 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2026 jit_tls->handling_stack_ovf = 1;
2028 /*fprintf (stderr, "Already handling stack overflow\n");*/
2037 MonoMethod *omethod;
2039 } PrintOverflowUserData;
2041 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2043 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2045 MonoMethod *method = NULL;
2046 PrintOverflowUserData *user_data = data;
2049 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2050 method = jinfo_get_method (frame->ji);
2053 if (user_data->count == 0) {
2054 /* The first frame is in its prolog, so a line number cannot be computed */
2055 user_data->count ++;
2059 /* If this is a one method overflow, skip the other instances */
2060 if (method == user_data->omethod)
2063 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2064 mono_runtime_printf_err (" %s", location);
2067 if (user_data->count == 1) {
2068 mono_runtime_printf_err (" <...>");
2069 user_data->omethod = method;
2071 user_data->omethod = NULL;
2074 user_data->count ++;
2076 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2083 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2085 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2086 PrintOverflowUserData ud;
2090 /* we don't do much now, but we can warn the user with a useful message */
2091 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2093 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2094 mono_sigctx_to_monoctx (ctx, &mctx);
2096 mono_runtime_printf_err ("Stacktrace:");
2098 memset (&ud, 0, sizeof (ud));
2100 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2102 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2103 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2105 mono_runtime_printf_err ("At <unmanaged>.");
2112 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2114 MonoMethod *method = NULL;
2116 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2117 method = jinfo_get_method (frame->ji);
2120 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2121 mono_runtime_printf_err (" %s", location);
2124 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2129 static G_GNUC_UNUSED gboolean
2130 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2132 GString *p = (GString*)data;
2133 MonoMethod *method = NULL;
2135 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2136 method = jinfo_get_method (frame->ji);
2138 if (method && frame->domain) {
2139 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2140 g_string_append_printf (p, " %s\n", location);
2143 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2148 #ifndef MONO_CROSS_COMPILE
2150 static gboolean handling_sigsegv = FALSE;
2153 * mono_handle_native_sigsegv:
2155 * Handle a SIGSEGV received while in native code by printing diagnostic
2156 * information and aborting.
2159 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2161 #ifdef MONO_ARCH_USE_SIGACTION
2162 struct sigaction sa;
2164 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2165 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2167 if (handling_sigsegv)
2170 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2171 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2182 /* To prevent infinite loops when the stack walk causes a crash */
2183 handling_sigsegv = TRUE;
2185 /* !jit_tls means the thread was not registered with the runtime */
2186 if (jit_tls && mono_thread_internal_current ()) {
2187 mono_runtime_printf_err ("Stacktrace:\n");
2189 mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL);
2192 #ifdef HAVE_BACKTRACE_SYMBOLS
2198 mono_runtime_printf_err ("\nNative stacktrace:\n");
2200 size = backtrace (array, 256);
2201 names = backtrace_symbols (array, size);
2202 for (i =0; i < size; ++i) {
2203 mono_runtime_printf_err ("\t%s", names [i]);
2207 /* Try to get more meaningful information using gdb */
2209 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2210 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2211 /* From g_spawn_command_line_sync () in eglib */
2214 pid_t crashed_pid = getpid ();
2218 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2219 * it will deadlock. Call the syscall directly instead.
2221 pid = mono_runtime_syscall_fork ();
2222 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2224 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2225 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2226 // distributions set the scope to 1 which allows attaching only to direct children of
2227 // the current process
2228 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2232 dup2 (STDERR_FILENO, STDOUT_FILENO);
2234 mono_gdb_render_native_backtraces (crashed_pid);
2238 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2239 waitpid (pid, &status, 0);
2243 #elif defined (ENABLE_EXTENSION_MODULE)
2244 mono_extension_handle_native_sigsegv (ctx, info);
2248 * A SIGSEGV indicates something went very wrong so we can no longer depend
2249 * on anything working. So try to print out lots of diagnostics, starting
2250 * with ones which have a greater chance of working.
2252 mono_runtime_printf_err (
2254 "=================================================================\n"
2255 "Got a %s while executing native code. This usually indicates\n"
2256 "a fatal error in the mono runtime or one of the native libraries \n"
2257 "used by your application.\n"
2258 "=================================================================\n",
2262 #ifdef MONO_ARCH_USE_SIGACTION
2264 /* Remove our SIGABRT handler */
2265 sa.sa_handler = SIG_DFL;
2266 sigemptyset (&sa.sa_mask);
2269 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2273 if (!mono_do_crash_chaining) {
2274 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2275 #if defined (PLATFORM_ANDROID)
2286 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2288 g_assert_not_reached ();
2291 #endif /* !MONO_CROSS_COMPILE */
2294 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2296 MonoInternalThread *thread = mono_thread_internal_current ();
2297 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2305 GError *error = NULL;
2310 text = g_string_new (0);
2312 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2314 g_string_append_printf (text, "\n\"%s\"", name);
2317 else if (thread->threadpool_thread)
2318 g_string_append (text, "\n\"<threadpool thread>\"");
2320 g_string_append (text, "\n\"<unnamed thread>\"");
2323 wapi_desc = wapi_current_thread_desc ();
2324 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2328 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2330 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2332 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2334 mono_sigctx_to_monoctx (sigctx, &ctx);
2336 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2338 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2341 mono_runtime_printf ("%s", text->str);
2343 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2344 OutputDebugStringA(text->str);
2347 g_string_free (text, TRUE);
2348 mono_runtime_stdout_fflush ();
2352 * mono_print_thread_dump:
2354 * Print information about the current thread to stdout.
2355 * SIGCTX can be NULL, allowing this to be called from gdb.
2358 mono_print_thread_dump (void *sigctx)
2360 mono_print_thread_dump_internal (sigctx, NULL);
2364 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2366 mono_print_thread_dump_internal (NULL, ctx);
2370 * mono_resume_unwind:
2372 * This is called by a trampoline from LLVM compiled finally clauses to continue
2376 mono_resume_unwind (MonoContext *ctx)
2378 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2379 MonoContext new_ctx;
2381 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2382 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2385 mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL);
2387 mono_restore_context (&new_ctx);
2390 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2395 MonoJitExceptionInfo *ei;
2396 } FindHandlerBlockData;
2399 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2403 FindHandlerBlockData *pdata = data;
2404 MonoJitInfo *ji = frame->ji;
2409 ip = MONO_CONTEXT_GET_IP (ctx);
2411 for (i = 0; i < ji->num_clauses; ++i) {
2412 MonoJitExceptionInfo *ei = ji->clauses + i;
2413 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2415 /*If ip points to the first instruction it means the handler block didn't start
2416 so we can leave its execution to the EH machinery*/
2417 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2429 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2432 MonoJitExceptionInfo *clause = NULL;
2435 ip = MONO_CONTEXT_GET_IP (ctx);
2437 for (i = 0; i < ji->num_clauses; ++i) {
2438 clause = &ji->clauses [i];
2439 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2441 if (clause->handler_start < ip && clause->data.handler_end > ip)
2445 /*no matching finally */
2446 if (i == ji->num_clauses)
2449 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2450 if (ip == clause->handler_start)
2453 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2457 * Finds the bottom handler block running and install a block guard if needed.
2458 * FIXME add full-aot support.
2461 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2463 FindHandlerBlockData data = { 0 };
2464 MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2471 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2472 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2474 if (!jit_tls || jit_tls->handler_block_return_address)
2477 /* Do an async safe stack walk */
2478 mono_thread_info_set_is_async_context (TRUE);
2479 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2480 mono_thread_info_set_is_async_context (FALSE);
2485 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2487 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2488 if (resume_ip == NULL)
2491 jit_tls->handler_block_return_address = resume_ip;
2492 jit_tls->handler_block = data.ei;
2499 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2507 mono_set_cast_details (MonoClass *from, MonoClass *to)
2509 MonoJitTlsData *jit_tls = NULL;
2511 if (mini_get_debug_options ()->better_cast_details) {
2512 jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2513 jit_tls->class_cast_from = from;
2514 jit_tls->class_cast_to = to;
2519 /*returns false if the thread is not attached*/
2521 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2523 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2524 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2532 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2534 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2535 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2536 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2539 mono_thread_state_init (ctx);
2542 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2548 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2554 mono_thread_state_init (MonoThreadUnwindState *ctx)
2556 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2558 #if defined(MONO_CROSS_COMPILE)
2559 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2560 #elif MONO_ARCH_HAS_MONO_CONTEXT
2561 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2563 g_error ("Use a null sigctx requires a working mono-context");
2566 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2567 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2568 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2574 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2576 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2583 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2584 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2585 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2590 /*returns false if the thread is not attached*/
2592 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2594 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2595 MONO_ARCH_CONTEXT_DEF
2597 mono_arch_flush_register_windows ();
2599 if (!thread || !thread->jit_data) {
2603 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2604 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2606 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2609 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2610 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2611 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2617 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2619 mono_handle_exception (ctx, exc);
2620 mono_restore_context (ctx);
2623 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2625 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2627 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2628 MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id);
2629 jit_tls->ex_ctx = *ctx;
2631 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2633 g_error ("This target doesn't support mono_arch_setup_async_callback");
2638 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2640 unhandled_exception_hook = func;
2641 unhandled_exception_hook_data = user_data;
2645 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2647 if (unhandled_exception_hook) {
2648 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2650 MonoObject *other = NULL;
2651 MonoString *str = mono_object_to_string (exc, &other);
2655 msg = mono_string_to_utf8 (str);
2657 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2658 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2660 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2661 original_backtrace, nested_backtrace);
2663 g_free (original_backtrace);
2664 g_free (nested_backtrace);
2666 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2668 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2670 #if defined(HOST_IOS)
2671 g_assertion_message ("Terminating runtime due to unhandled exception");
2673 exit (mono_environment_exitcode_get ());
2677 g_assert_not_reached ();
2681 * mono_restore_context:
2683 * Call the architecture specific restore context function.
2686 mono_restore_context (MonoContext *ctx)
2688 static void (*restore_context) (MonoContext *);
2690 if (!restore_context)
2691 restore_context = mono_get_restore_context ();
2692 restore_context (ctx);
2693 g_assert_not_reached ();
2697 * mono_jinfo_get_unwind_info:
2699 * Return the unwind info for JI.
2702 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2705 return mono_aot_get_unwind_info (ji, unwind_info_len);
2707 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2711 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2713 MonoArchEHJitInfo *info;
2715 info = mono_jit_info_get_arch_eh_info (ji);
2718 return info->epilog_size;