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>
49 #include <mono/metadata/appdomain.h>
50 #include <mono/metadata/tabledefs.h>
51 #include <mono/metadata/threads.h>
52 #include <mono/metadata/threads-types.h>
53 #include <mono/metadata/debug-helpers.h>
54 #include <mono/metadata/exception.h>
55 #include <mono/metadata/object-internals.h>
56 #include <mono/metadata/gc-internals.h>
57 #include <mono/metadata/mono-debug.h>
58 #include <mono/metadata/profiler.h>
59 #include <mono/metadata/mono-endian.h>
60 #include <mono/metadata/environment.h>
61 #include <mono/metadata/mono-mlist.h>
62 #include <mono/utils/mono-mmap.h>
63 #include <mono/utils/mono-logger-internals.h>
67 #include "debugger-agent.h"
68 #include "seq-points.h"
69 #include "llvm-runtime.h"
70 #include "mini-llvm.h"
73 #include "mini-llvm-cpp.h"
76 #ifdef ENABLE_EXTENSION_MODULE
77 #include "../../../mono-extensions/mono/mini/mini-exceptions.c"
80 #ifndef MONO_ARCH_CONTEXT_DEF
81 #define MONO_ARCH_CONTEXT_DEF
84 static gpointer restore_context_func, call_filter_func;
85 static gpointer throw_exception_func, rethrow_exception_func;
86 static gpointer throw_corlib_exception_func;
88 static gpointer try_more_restore_tramp = NULL;
89 static gpointer restore_stack_protection_tramp = NULL;
91 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
92 static gpointer unhandled_exception_hook_data = NULL;
94 static void try_more_restore (void);
95 static void restore_stack_protection (void);
96 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
97 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
98 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
101 mono_exceptions_init (void)
103 MonoRuntimeExceptionHandlingCallbacks cbs;
105 restore_context_func = mono_aot_get_trampoline ("restore_context");
106 call_filter_func = mono_aot_get_trampoline ("call_filter");
107 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
108 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
112 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
113 mono_tramp_info_register (info, NULL);
114 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
115 mono_tramp_info_register (info, NULL);
116 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
117 mono_tramp_info_register (info, NULL);
118 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
119 mono_tramp_info_register (info, NULL);
121 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
122 if (!mono_llvm_only) {
123 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
124 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
128 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
129 mono_arch_exceptions_init ();
131 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
132 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
135 cbs.mono_raise_exception = mono_llvm_raise_exception;
137 cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
138 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
139 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
140 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
141 mono_install_eh_callbacks (&cbs);
145 mono_get_throw_exception (void)
147 g_assert (throw_exception_func);
148 return throw_exception_func;
152 mono_get_rethrow_exception (void)
154 g_assert (rethrow_exception_func);
155 return rethrow_exception_func;
159 mono_get_call_filter (void)
161 g_assert (call_filter_func);
162 return call_filter_func;
166 mono_get_restore_context (void)
168 g_assert (restore_context_func);
169 return restore_context_func;
173 mono_get_throw_corlib_exception (void)
175 gpointer code = NULL;
178 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
179 if (throw_corlib_exception_func)
180 return throw_corlib_exception_func;
183 code = mono_aot_get_trampoline ("throw_corlib_exception");
185 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
186 mono_tramp_info_register (info, NULL);
189 mono_memory_barrier ();
191 throw_corlib_exception_func = code;
193 return throw_corlib_exception_func;
197 * mono_get_throw_exception_addr:
199 * Return an address which stores the result of
200 * mono_get_throw_exception.
203 mono_get_throw_exception_addr (void)
205 return &throw_exception_func;
209 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
211 MonoTryBlockHoleTableJitInfo *table;
216 if (ei->try_start > ip || ip >= ei->try_end)
219 if (!ji->has_try_block_holes)
222 table = mono_jit_info_get_try_block_hole_table_info (ji);
223 offset = (guint32)((char*)ip - (char*)ji->code_start);
224 clause = (guint16)(ei - ji->clauses);
225 g_assert (clause < ji->num_clauses);
227 for (i = 0; i < table->num_holes; ++i) {
228 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
229 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
238 * Translate between the mono_arch_unwind_frame function and the old API.
241 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
242 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
244 StackFrameInfo frame;
247 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
249 /* Avoid costly table lookup during stack overflow */
250 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
253 ji = mini_jit_info_table_find (domain, (char *)ip, NULL);
258 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
260 return (MonoJitInfo *)-1;
262 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
264 * Remove any unused lmf.
265 * Mask out the lower bits which might be used to hold additional information.
267 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
270 /* Convert between the new and the old APIs */
271 switch (frame.type) {
272 case FRAME_TYPE_MANAGED:
276 case FRAME_TYPE_TRAMPOLINE:
278 case FRAME_TYPE_MANAGED_TO_NATIVE:
282 memset (res, 0, sizeof (MonoJitInfo));
283 res->d.method = frame.method;
286 case FRAME_TYPE_DEBUGGER_INVOKE: {
290 * The normal exception handling code can't handle this frame, so just
293 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
294 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
298 g_assert_not_reached ();
303 /* mono_find_jit_info:
305 * This function is used to gather information from @ctx. It return the
306 * MonoJitInfo of the corresponding function, unwinds one stack frame and
307 * stores the resulting context into @new_ctx. It also stores a string
308 * describing the stack location into @trace (if not NULL), and modifies
309 * the @lmf if necessary. @native_offset return the IP offset from the
310 * start of the function or -1 if that info is not available.
313 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
314 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
318 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
320 MonoMethod *method = NULL;
331 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
333 if (ji == (gpointer)-1)
336 if (ji && !ji->is_trampoline)
337 method = jinfo_get_method (ji);
339 if (managed2 || (method && method->wrapper_type)) {
340 const char *real_ip, *start;
343 start = (const char *)ji->code_start;
345 /* ctx->ip points into native code */
346 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
348 real_ip = (const char*)ip;
350 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
351 offset = real_ip - start;
356 *native_offset = offset;
359 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
363 *trace = mono_debug_print_stack_frame (method, offset, domain);
366 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
367 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
376 * mono_find_jit_info_ext:
378 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
380 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
381 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
382 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
383 * to obtain the last managed frame.
384 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
385 * On return, it will be filled with the locations where callee saved registers are saved
386 * by the current frame. This is returned outside of StackFrameInfo because it can be
387 * quite large on some platforms.
388 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
392 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
393 MonoJitInfo *prev_ji, MonoContext *ctx,
394 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
395 mgreg_t **save_locations,
396 StackFrameInfo *frame)
399 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
401 MonoDomain *target_domain = domain;
402 MonoMethod *method = NULL;
403 gboolean async = mono_thread_info_is_async_context ();
408 /* Avoid costly table lookup during stack overflow */
409 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
412 ji = mini_jit_info_table_find (domain, (char *)ip, &target_domain);
415 target_domain = domain;
418 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
420 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
424 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
426 * Remove any unused lmf.
427 * Mask out the lower bits which might be used to hold additional information.
429 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
432 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
433 method = jinfo_get_method (frame->ji);
435 if (frame->type == FRAME_TYPE_MANAGED && method) {
436 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
437 frame->managed = TRUE;
440 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
442 * This type of frame is just a marker, the caller should unwind once more to get the
443 * last managed frame.
446 frame->method = NULL;
449 frame->native_offset = -1;
450 frame->domain = target_domain;
451 frame->async_context = async;
455 if (frame->type == FRAME_TYPE_MANAGED)
456 frame->method = method;
458 if (ji && (frame->managed || (method && method->wrapper_type))) {
459 const char *real_ip, *start;
461 start = (const char *)ji->code_start;
462 if (frame->type == FRAME_TYPE_MANAGED)
463 real_ip = (const char*)ip;
465 /* ctx->ip points into native code */
466 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
468 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
469 frame->native_offset = real_ip - start;
471 frame->native_offset = -1;
475 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
477 if (trace && frame->method) {
478 char *fname = mono_method_full_name (frame->method, TRUE);
479 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
488 * This function is async-safe.
491 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
493 MonoGenericJitInfo *gi;
497 if (!ji->has_generic_jit_info)
499 gi = mono_jit_info_get_generic_jit_info (ji);
505 * Search location list if available, it contains the precise location of the
506 * argument for every pc offset, even if the method was interrupted while it was in
510 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
513 for (i = 0; i < gi->nlocs; ++i) {
514 MonoDwarfLocListEntry *entry = &gi->locations [i];
516 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
518 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
520 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
524 g_assert (i < gi->nlocs);
527 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
529 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
533 method = jinfo_get_method (ji);
534 if (mono_method_get_context (method)->method_inst) {
535 /* A MonoMethodRuntimeGenericContext* */
537 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
541 /* Avoid returning a managed object */
542 MonoObject *this_obj = (MonoObject *)info;
544 return this_obj->vtable;
549 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
551 static MonoGenericContext
552 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
554 MonoGenericContext context = { NULL, NULL };
555 MonoClass *klass, *method_container_class;
558 g_assert (generic_info);
560 method = jinfo_get_method (ji);
561 g_assert (method->is_inflated);
562 if (mono_method_get_context (method)->method_inst) {
563 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
565 klass = mrgctx->class_vtable->klass;
566 context.method_inst = mrgctx->method_inst;
567 g_assert (context.method_inst);
569 MonoVTable *vtable = (MonoVTable *)generic_info;
571 klass = vtable->klass;
574 //g_assert (!method->klass->generic_container);
575 if (method->klass->generic_class)
576 method_container_class = method->klass->generic_class->container_class;
578 method_container_class = method->klass;
580 /* class might refer to a subclass of method's class */
581 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
582 klass = klass->parent;
586 if (klass->generic_class || klass->generic_container)
587 context.class_inst = mini_class_get_context (klass)->class_inst;
589 if (klass->generic_class)
590 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
592 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
598 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
601 MonoGenericContext context;
604 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
605 return jinfo_get_method (ji);
606 context = get_generic_context_from_stack_frame (ji, generic_info);
608 method = jinfo_get_method (ji);
609 method = mono_method_get_declaring_generic_method (method);
610 method = mono_class_inflate_generic_method_checked (method, &context, &error);
611 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
617 * mono_exception_walk_native_trace:
618 * @ex: The exception object whose frames should be walked
619 * @func: callback to call for each stack frame
620 * @user_data: data passed to the callback
622 * This function walks the stacktrace of an exception. For
623 * each frame the callback function is called with the relevant info.
624 * The walk ends when no more stack frames are found or when the callback
625 * returns a TRUE value.
629 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
631 MonoDomain *domain = mono_domain_get ();
632 MonoArray *ta = ex->trace_ips;
638 len = mono_array_length (ta) >> 1;
639 for (i = 0; i < len; i++) {
640 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
641 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
642 MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)ip);
645 if (func (NULL, ip, 0, FALSE, user_data))
648 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
649 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
658 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
660 MonoDomain *domain = mono_domain_get ();
662 MonoArray *ta = exc->trace_ips;
663 MonoDebugSourceLocation *location;
667 /* Exception is not thrown yet */
668 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
671 len = mono_array_length (ta) >> 1;
673 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
675 for (i = skip; i < len; i++) {
677 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class);
678 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
679 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
682 ji = mono_jit_info_table_find (domain, (char *)ip);
684 /* Unmanaged frame */
685 mono_array_setref (res, i, sf);
689 g_assert (ji != NULL);
691 method = get_method_from_stack_frame (ji, generic_info);
692 if (jinfo_get_method (ji)->wrapper_type) {
696 s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
697 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
701 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
703 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
704 sf->method_address = (gsize) ji->code_start;
705 sf->native_offset = (char *)ip - (char *)ji->code_start;
708 * mono_debug_lookup_source_location() returns both the file / line number information
709 * and the IL offset. Note that computing the IL offset is already an expensive
710 * operation, so we shouldn't call this method twice.
712 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
714 sf->il_offset = location->il_offset;
717 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
718 sf->il_offset = sp.il_offset;
723 if (need_file_info) {
724 if (location && location->source_file) {
725 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
726 sf->line = location->row;
727 sf->column = location->column;
729 sf->line = sf->column = 0;
734 mono_debug_free_source_location (location);
735 mono_array_setref (res, i, sf);
742 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
745 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
746 if (jit_tls && jit_tls->orig_ex_ctx_set)
747 start_ctx = &jit_tls->orig_ex_ctx;
749 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
752 * mono_walk_stack_with_ctx:
754 * Unwind the current thread starting at @start_ctx.
756 * If @start_ctx is null, we capture the current context.
759 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
761 MonoContext extra_ctx;
762 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
763 MONO_ARCH_CONTEXT_DEF
765 if (!thread || !thread->jit_data)
769 mono_arch_flush_register_windows ();
771 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
772 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
774 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
776 start_ctx = &extra_ctx;
779 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
783 * mono_walk_stack_with_state:
785 * Unwind a thread described by @state.
787 * State must be valid (state->valid == TRUE).
789 * If you are using this function to unwind another thread, make sure it is suspended.
791 * If @state is null, we capture the current context.
794 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
796 MonoThreadUnwindState extra_state;
798 g_assert (!mono_thread_info_is_async_context ());
799 if (!mono_thread_state_init_from_current (&extra_state))
801 state = &extra_state;
804 g_assert (state->valid);
806 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
810 mono_walk_stack_full (func,
812 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
813 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
814 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
815 unwind_options, user_data);
819 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
821 MonoThreadUnwindState state;
822 if (!mono_thread_state_init_from_current (&state))
824 mono_walk_stack_with_state (func, &state, options, user_data);
828 * mono_walk_stack_full:
829 * @func: callback to call for each stack frame
830 * @domain: starting appdomain, can be NULL to use the current domain
831 * @unwind_options: what extra information the unwinder should gather
832 * @start_ctx: starting state of the stack walk, can be NULL.
833 * @thread: the thread whose stack to walk, can be NULL to use the current thread
834 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
835 * @user_data: data passed to the callback
837 * This function walks the stack of a thread, starting from the state
838 * represented by start_ctx. For each frame the callback
839 * function is called with the relevant info. The walk ends when no more
840 * managed stack frames are found or when the callback returns a TRUE value.
843 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
846 MonoContext ctx, new_ctx;
847 StackFrameInfo frame;
849 mgreg_t *reg_locations [MONO_MAX_IREGS];
850 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
851 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
852 gboolean async = mono_thread_info_is_async_context ();
854 g_assert (start_ctx);
857 /*The LMF will be null if the target have no managed frames.*/
858 /* g_assert (lmf); */
861 g_assert (unwind_options == MONO_UNWIND_NONE);
863 memcpy (&ctx, start_ctx, sizeof (MonoContext));
864 memset (reg_locations, 0, sizeof (reg_locations));
866 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
868 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
872 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
873 MonoDebugSourceLocation *source;
875 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
877 il_offset = source->il_offset;
880 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
881 il_offset = sp.il_offset;
885 mono_debug_free_source_location (source);
889 frame.il_offset = il_offset;
891 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
892 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
894 frame.actual_method = frame.method;
897 if (get_reg_locations)
898 frame.reg_locations = reg_locations;
900 if (func (&frame, &ctx, user_data))
903 if (get_reg_locations) {
904 for (i = 0; i < MONO_MAX_IREGS; ++i)
905 if (new_reg_locations [i])
906 reg_locations [i] = new_reg_locations [i];
914 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
915 MonoReflectionMethod **method,
916 gint32 *iloffset, gint32 *native_offset,
917 MonoString **file, gint32 *line, gint32 *column)
919 MonoDomain *domain = mono_domain_get ();
920 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
921 MonoLMF *lmf = mono_get_lmf ();
922 MonoJitInfo *ji = NULL;
923 MonoContext ctx, new_ctx;
924 MonoDebugSourceLocation *location;
925 MonoMethod *jmethod = NULL, *actual_method;
926 StackFrameInfo frame;
929 MONO_ARCH_CONTEXT_DEF;
931 mono_arch_flush_register_windows ();
933 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
934 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
936 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
942 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
946 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
947 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
948 frame.type == FRAME_TYPE_TRAMPOLINE)
952 *native_offset = frame.native_offset;
954 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
955 jmethod = jinfo_get_method (ji);
956 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
961 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
963 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
965 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
967 *iloffset = location->il_offset;
971 if (need_file_info) {
973 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
974 *line = location->row;
975 *column = location->column;
982 mono_debug_free_source_location (location);
988 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
990 MonoClass *catch_class = ei->data.catch_class;
991 MonoType *inflated_type;
992 MonoGenericContext context;
994 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
995 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
998 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1000 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1002 /* FIXME: we shouldn't inflate but instead put the
1003 type in the rgctx and fetch it from there. It
1004 might be a good idea to do this lazily, i.e. only
1005 when the exception is actually thrown, so as not to
1006 waste space for exception clauses which might never
1008 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1009 catch_class = mono_class_from_mono_type (inflated_type);
1010 mono_metadata_free_type (inflated_type);
1016 * mini_jit_info_table_find_ext:
1018 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1019 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1020 * OUT_DOMAIN if it is not NULL.
1023 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1026 MonoInternalThread *t = mono_thread_internal_current ();
1032 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1035 *out_domain = domain;
1039 /* maybe it is shared code, so we also search in the root domain */
1040 if (domain != mono_get_root_domain ()) {
1041 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1044 *out_domain = mono_get_root_domain ();
1052 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1053 for (; refs && *refs; refs++) {
1054 if (*refs != domain && *refs != mono_get_root_domain ()) {
1055 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1058 *out_domain = (MonoDomain*) *refs;
1068 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1070 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1074 * wrap_non_exception_throws:
1076 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1077 * WrapNonExceptionThrows flag set.
1080 wrap_non_exception_throws (MonoMethod *m)
1082 MonoAssembly *ass = m->klass->image->assembly;
1083 MonoCustomAttrInfo* attrs;
1084 static MonoClass *klass;
1086 gboolean val = FALSE;
1089 if (ass->wrap_non_exception_throws_inited)
1090 return ass->wrap_non_exception_throws;
1092 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1094 attrs = mono_custom_attrs_from_assembly (ass);
1096 for (i = 0; i < attrs->num_attrs; ++i) {
1097 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1099 int num_named, named_type, name_len;
1102 if (!attr->ctor || attr->ctor->klass != klass)
1104 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1105 p = (const char*)attr->data;
1106 g_assert (read16 (p) == 0x0001);
1108 num_named = read16 (p);
1114 /* data_type = *p; */
1117 if (named_type != 0x54)
1119 name_len = mono_metadata_decode_blob_size (p, &p);
1120 name = (char *)g_malloc (name_len + 1);
1121 memcpy (name, p, name_len);
1122 name [name_len] = 0;
1124 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1126 /* The value is a BOOLEAN */
1129 mono_custom_attrs_free (attrs);
1132 ass->wrap_non_exception_throws = val;
1133 mono_memory_barrier ();
1134 ass->wrap_non_exception_throws_inited = TRUE;
1139 #ifndef MONO_ARCH_STACK_GROWS_UP
1140 #define DOES_STACK_GROWS_UP 1
1142 #define DOES_STACK_GROWS_UP 0
1145 #define MAX_UNMANAGED_BACKTRACE 128
1147 build_native_trace (void)
1149 /* This puppy only makes sense on mobile, IOW, ARM. */
1150 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1152 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1153 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1158 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1160 for (i = 0; i < size; i++)
1161 mono_array_set (res, gpointer, i, native_trace [i]);
1169 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1171 if (mono_ex && !initial_trace_ips) {
1172 *trace_ips = g_list_reverse (*trace_ips);
1173 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (*trace_ips, mono_defaults.int_class));
1174 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1175 if (dynamic_methods) {
1176 /* These methods could go away anytime, so save a reference to them in the exception object */
1178 MonoMList *list = NULL;
1180 for (l = dynamic_methods; l; l = l->next) {
1182 MonoDomain *domain = mono_domain_get ();
1184 if (domain->method_to_dyn_method) {
1185 mono_domain_lock (domain);
1186 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1187 mono_domain_unlock (domain);
1189 MonoObject *o = mono_gchandle_get_target (dis_link);
1191 list = mono_mlist_prepend (list, o);
1197 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1200 g_list_free (*trace_ips);
1205 * mono_handle_exception_internal_first_pass:
1207 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1208 * OBJ is found. Run the index of the filter clause which caught the exception into
1209 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1212 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1214 MonoDomain *domain = mono_domain_get ();
1215 MonoJitInfo *ji = NULL;
1216 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1217 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1218 MonoLMF *lmf = mono_get_lmf ();
1219 MonoArray *initial_trace_ips = NULL;
1220 GList *trace_ips = NULL;
1221 GSList *dynamic_methods = NULL;
1222 MonoException *mono_ex;
1223 gboolean stack_overflow = FALSE;
1224 MonoContext initial_ctx;
1226 int frame_count = 0;
1231 g_assert (ctx != NULL);
1233 if (obj == (MonoObject *)domain->stack_overflow_ex)
1234 stack_overflow = TRUE;
1236 mono_ex = (MonoException*)obj;
1237 initial_trace_ips = mono_ex->trace_ips;
1239 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1240 mono_ex = (MonoException*)obj;
1241 initial_trace_ips = mono_ex->trace_ips;
1247 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1249 g_assert (jit_tls->end_of_stack);
1250 g_assert (jit_tls->abort_func);
1253 *out_filter_idx = -1;
1257 *out_prev_ji = NULL;
1262 MonoContext new_ctx;
1264 int clause_index_start = 0;
1265 gboolean unwind_res = TRUE;
1267 StackFrameInfo frame;
1272 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1274 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1275 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1276 frame.type == FRAME_TYPE_TRAMPOLINE) {
1280 g_assert (frame.type == FRAME_TYPE_MANAGED);
1285 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1286 g_slist_free (dynamic_methods);
1291 method = jinfo_get_method (ji);
1292 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1294 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1295 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1296 "The native frame called the managed method:\n%s\n",
1297 mono_method_full_name (method, TRUE));
1300 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1302 * Avoid overwriting the stack trace if the exception is
1303 * rethrown. Also avoid giant stack traces during a stack
1306 if (!initial_trace_ips && (frame_count < 1000)) {
1307 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1308 trace_ips = g_list_prepend (trace_ips,
1309 get_generic_info_from_stack_frame (ji, ctx));
1313 if (method->dynamic)
1314 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1316 if (stack_overflow) {
1317 if (DOES_STACK_GROWS_UP)
1318 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1320 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1322 free_stack = 0xffffff;
1325 for (i = clause_index_start; i < ji->num_clauses; i++) {
1326 MonoJitExceptionInfo *ei = &ji->clauses [i];
1327 gboolean filtered = FALSE;
1330 * During stack overflow, wait till the unwinding frees some stack
1331 * space before running handlers/finalizers.
1333 if (free_stack <= (64 * 1024))
1336 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1338 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1341 * Have to unwrap RuntimeWrappedExceptions if the
1342 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1344 if (non_exception && !wrap_non_exception_throws (method))
1345 ex_obj = non_exception;
1349 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1350 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1351 #ifndef DISABLE_PERFCOUNTERS
1352 mono_perfcounters->exceptions_filters++;
1355 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1356 trim the stackframe since if it returns FALSE we lose information.
1358 FIXME Not 100% sure if it's a good idea even with user clauses.
1361 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1363 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1365 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1367 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1368 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1370 g_assert (!ji->from_llvm);
1371 /* store the exception object in bp + ei->exvar_offset */
1372 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1375 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1377 * Pass the original il clause index to the landing pad so it can
1378 * branch to the landing pad associated with the il clause.
1379 * This is needed because llvm compiled code assumes that the EH
1380 * code always branches to the innermost landing pad.
1383 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1386 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1387 filtered = call_filter (ctx, ei->data.filter);
1388 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1389 if (filtered && out_filter_idx)
1390 *out_filter_idx = filter_idx;
1397 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1398 g_slist_free (dynamic_methods);
1399 /* mono_debugger_agent_handle_exception () needs this */
1400 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1405 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1406 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1407 g_slist_free (dynamic_methods);
1412 /* mono_debugger_agent_handle_exception () needs this */
1413 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1422 g_assert_not_reached ();
1426 * mono_handle_exception_internal:
1427 * @ctx: saved processor state
1428 * @obj: the exception object
1429 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1432 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1434 MonoDomain *domain = mono_domain_get ();
1435 MonoJitInfo *ji, *prev_ji;
1436 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1437 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1438 MonoLMF *lmf = mono_get_lmf ();
1439 MonoException *mono_ex;
1440 gboolean stack_overflow = FALSE;
1441 MonoContext initial_ctx;
1443 int frame_count = 0;
1444 gint32 filter_idx, first_filter_idx = 0;
1447 MonoObject *non_exception = NULL;
1449 g_assert (ctx != NULL);
1451 MonoException *ex = mono_get_exception_null_reference ();
1452 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1453 obj = (MonoObject *)ex;
1457 * Allocate a new exception object instead of the preconstructed ones.
1459 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1461 * It is not a good idea to try and put even more pressure on the little stack available.
1462 * obj = mono_get_exception_stack_overflow ();
1464 stack_overflow = TRUE;
1466 else if (obj == (MonoObject *)domain->null_reference_ex) {
1467 obj = (MonoObject *)mono_get_exception_null_reference ();
1470 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1471 non_exception = obj;
1472 obj = (MonoObject *)mono_get_exception_runtime_wrapped (obj);
1475 mono_ex = (MonoException*)obj;
1477 if (mini_get_debug_options ()->suspend_on_exception) {
1478 mono_runtime_printf_err ("Exception thrown, suspending...");
1483 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1484 mono_ex = (MonoException*)obj;
1489 if (mono_ex && jit_tls->class_cast_from) {
1490 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1491 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1492 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1493 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1494 mono_ex->message = mono_string_new (domain, msg);
1499 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1500 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1501 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1502 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1503 mono_ex->message = mono_string_new (domain, msg);
1511 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1513 g_assert (jit_tls->end_of_stack);
1514 g_assert (jit_tls->abort_func);
1517 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1518 * end up being TRUE on any code path.
1520 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1525 MonoContext ctx_cp = *ctx;
1526 if (mono_trace_is_enabled ()) {
1527 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1528 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1529 MonoObject *message;
1530 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1532 MonoObject *exc = NULL;
1533 if (get_message == NULL) {
1535 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1537 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1539 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1543 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1545 g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)mono_native_thread_id_get (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg);
1547 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1548 mono_print_thread_dump_from_ctx (ctx);
1550 jit_tls->orig_ex_ctx_set = TRUE;
1551 mono_profiler_exception_thrown (obj);
1552 jit_tls->orig_ex_ctx_set = FALSE;
1554 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1557 if (mini_get_debug_options ()->break_on_exc)
1559 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1561 if (mini_get_debug_options ()->suspend_on_unhandled) {
1562 mono_runtime_printf_err ("Unhandled exception, suspending...");
1567 // FIXME: This runs managed code so it might cause another stack overflow when
1568 // we are handling a stack overflow
1569 mono_unhandled_exception (obj);
1571 gboolean unhandled = FALSE;
1574 * The exceptions caught by the mono_runtime_invoke () calls
1575 * in the threadpool needs to be treated as unhandled (#669836).
1577 * FIXME: The check below is hackish, but its hard to distinguish
1578 * these runtime invoke calls from others in the runtime.
1580 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1581 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1586 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1588 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1598 MonoContext new_ctx;
1600 int clause_index_start = 0;
1601 gboolean unwind_res = TRUE;
1605 ji = jit_tls->resume_state.ji;
1606 new_ctx = jit_tls->resume_state.new_ctx;
1607 clause_index_start = jit_tls->resume_state.clause_index;
1608 lmf = jit_tls->resume_state.lmf;
1609 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1610 filter_idx = jit_tls->resume_state.filter_idx;
1612 StackFrameInfo frame;
1614 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1616 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1617 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1618 frame.type == FRAME_TYPE_TRAMPOLINE) {
1622 g_assert (frame.type == FRAME_TYPE_MANAGED);
1628 *(mono_get_lmf_addr ()) = lmf;
1630 jit_tls->abort_func (obj);
1631 g_assert_not_reached ();
1634 method = jinfo_get_method (ji);
1636 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1638 if (stack_overflow) {
1639 if (DOES_STACK_GROWS_UP)
1640 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1642 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1644 free_stack = 0xffffff;
1647 for (i = clause_index_start; i < ji->num_clauses; i++) {
1648 MonoJitExceptionInfo *ei = &ji->clauses [i];
1649 gboolean filtered = FALSE;
1652 * During stack overflow, wait till the unwinding frees some stack
1653 * space before running handlers/finalizers.
1655 if (free_stack <= (64 * 1024))
1658 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1660 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1663 * Have to unwrap RuntimeWrappedExceptions if the
1664 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1666 if (non_exception && !wrap_non_exception_throws (method))
1667 ex_obj = non_exception;
1671 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1672 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1673 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1675 g_assert (!ji->from_llvm);
1676 /* store the exception object in bp + ei->exvar_offset */
1677 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1681 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1683 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1686 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1688 * Filter clauses should only be run in the
1689 * first pass of exception handling.
1691 filtered = (filter_idx == first_filter_idx);
1695 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1696 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1698 * This guards against the situation that we abort a thread that is executing a finally clause
1699 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1700 * check for this situation here and resume interruption if we are below the guarded block.
1702 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1703 gboolean is_outside = FALSE;
1704 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1705 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1706 //FIXME make this stack direction aware
1707 if (catch_bp > prot_bp) {
1709 } else if (catch_bp == prot_bp) {
1710 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1711 * So we check if the catch handler_start is protected by the guarded handler protected region
1714 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1715 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1716 * There aren't any further finally/fault handler blocks down the stack over this exception.
1717 * This must be ensured by the code that installs the guard trampoline.
1719 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1721 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1726 jit_tls->handler_block_return_address = NULL;
1727 jit_tls->handler_block = NULL;
1728 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1732 if (mono_trace_is_enabled () && mono_trace_eval (method))
1733 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1734 jit_tls->orig_ex_ctx_set = TRUE;
1735 mono_profiler_exception_clause_handler (method, ei->flags, i);
1736 jit_tls->orig_ex_ctx_set = FALSE;
1737 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1739 #ifndef DISABLE_PERFCOUNTERS
1740 mono_perfcounters->exceptions_depth += frame_count;
1742 if (obj == (MonoObject *)domain->stack_overflow_ex)
1743 jit_tls->handling_stack_ovf = FALSE;
1747 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1748 if (mono_trace_is_enabled () && mono_trace_eval (method))
1749 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1750 jit_tls->orig_ex_ctx_set = TRUE;
1751 mono_profiler_exception_clause_handler (method, ei->flags, i);
1752 jit_tls->orig_ex_ctx_set = FALSE;
1753 call_filter (ctx, ei->handler_start);
1755 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1756 if (mono_trace_is_enabled () && mono_trace_eval (method))
1757 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1758 jit_tls->orig_ex_ctx_set = TRUE;
1759 mono_profiler_exception_clause_handler (method, ei->flags, i);
1760 jit_tls->orig_ex_ctx_set = FALSE;
1761 #ifndef DISABLE_PERFCOUNTERS
1762 mono_perfcounters->exceptions_finallys++;
1765 if (ji->from_llvm) {
1767 * LLVM compiled finally handlers follow the design
1768 * of the c++ ehabi, i.e. they call a resume function
1769 * at the end instead of returning to the caller.
1770 * So save the exception handling state,
1771 * mono_resume_unwind () will call us again to continue
1774 jit_tls->resume_state.ex_obj = obj;
1775 jit_tls->resume_state.ji = ji;
1776 jit_tls->resume_state.clause_index = i + 1;
1777 jit_tls->resume_state.ctx = *ctx;
1778 jit_tls->resume_state.new_ctx = new_ctx;
1779 jit_tls->resume_state.lmf = lmf;
1780 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1781 jit_tls->resume_state.filter_idx = filter_idx;
1782 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1785 call_filter (ctx, ei->handler_start);
1791 jit_tls->orig_ex_ctx_set = TRUE;
1792 mono_profiler_exception_method_leave (method);
1793 jit_tls->orig_ex_ctx_set = FALSE;
1798 g_assert_not_reached ();
1802 * mono_debugger_run_finally:
1803 * @start_ctx: saved processor state
1805 * This method is called by the Mono Debugger to call all `finally' clauses of the
1806 * current stack frame. It's used when the user issues a `return' command to make
1807 * the current stack frame return. After returning from this method, the debugger
1808 * unwinds the stack one frame and gives control back to the user.
1810 * NOTE: This method is only used when running inside the Mono Debugger.
1813 mono_debugger_run_finally (MonoContext *start_ctx)
1815 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1816 MonoDomain *domain = mono_domain_get ();
1817 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1818 MonoLMF *lmf = mono_get_lmf ();
1819 MonoContext ctx, new_ctx;
1820 MonoJitInfo *ji, rji;
1825 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1826 if (!ji || ji == (gpointer)-1)
1830 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
1832 for (i = 0; i < ji->num_clauses; i++) {
1833 MonoJitExceptionInfo *ei = &ji->clauses [i];
1835 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1836 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1837 call_filter (&ctx, ei->handler_start);
1843 * mono_handle_exception:
1844 * @ctx: saved processor state
1845 * @obj: the exception object
1848 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
1850 #ifndef DISABLE_PERFCOUNTERS
1851 mono_perfcounters->exceptions_thrown++;
1854 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1857 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1859 #ifndef MONO_ARCH_USE_SIGACTION
1860 #error "Can't use sigaltstack without sigaction"
1863 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1866 mono_setup_altstack (MonoJitTlsData *tls)
1870 guint8 *staddr = NULL;
1872 if (mono_running_on_valgrind ())
1875 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1879 tls->end_of_stack = staddr + stsize;
1880 tls->stack_size = stsize;
1882 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1884 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1885 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1887 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1889 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1890 /* mprotect can fail for the main thread stack */
1891 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);
1892 g_assert (gaddr == tls->stack_ovf_guard_base);
1893 tls->stack_ovf_valloced = TRUE;
1896 /* Setup an alternate signal stack */
1897 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1898 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1900 g_assert (tls->signal_stack);
1902 sa.ss_sp = tls->signal_stack;
1903 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1905 g_assert (sigaltstack (&sa, NULL) == 0);
1907 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);
1911 mono_free_altstack (MonoJitTlsData *tls)
1916 sa.ss_sp = tls->signal_stack;
1917 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1918 sa.ss_flags = SS_DISABLE;
1919 err = sigaltstack (&sa, NULL);
1920 g_assert (err == 0);
1922 if (tls->signal_stack)
1923 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1924 if (tls->stack_ovf_valloced)
1925 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1927 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1930 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1933 mono_setup_altstack (MonoJitTlsData *tls)
1938 mono_free_altstack (MonoJitTlsData *tls)
1942 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1945 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1947 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1948 /* we need to leave some room for throwing the exception */
1949 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1950 unprotect_size -= mono_pagesize ();
1951 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1952 * is sufficient stack
1954 //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);
1956 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1957 return unprotect_size == jit_tls->stack_ovf_guard_size;
1960 static G_GNUC_UNUSED void
1961 try_more_restore (void)
1963 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1964 if (try_restore_stack_protection (jit_tls, 500))
1965 jit_tls->restore_stack_prot = NULL;
1968 static G_GNUC_UNUSED void
1969 restore_stack_protection (void)
1971 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1972 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1973 /* if we can't restore the stack protection, keep a callback installed so
1974 * we'll try to restore as much stack as we can at each return from unmanaged
1977 if (try_restore_stack_protection (jit_tls, 4096))
1978 jit_tls->restore_stack_prot = NULL;
1980 jit_tls->restore_stack_prot = try_more_restore_tramp;
1981 /* here we also throw a stack overflow exception */
1982 ex->trace_ips = NULL;
1983 ex->stack_trace = NULL;
1984 mono_raise_exception (ex);
1988 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1990 void (*func)(void) = (void (*)(void))tramp_data;
1996 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2001 /* we got a stack overflow in the soft-guard pages
2002 * There are two cases:
2003 * 1) managed code caused the overflow: we unprotect the soft-guard page
2004 * and let the arch-specific code trigger the exception handling mechanism
2005 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2006 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2007 * and hope we can continue with those enabled, at least until the hard-guard page
2008 * is hit. The alternative to continuing here is to just print a message and abort.
2009 * We may add in the future the code to protect the pages again in the codepath
2010 * when we return from unmanaged to managed code.
2012 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2013 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2014 /* we unprotect the minimum amount we can */
2016 gboolean handled = FALSE;
2018 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2019 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2020 guard_size -= mono_pagesize ();
2022 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2023 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2024 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);
2025 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2027 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2032 /* We print a message: after this even managed stack overflows
2033 * may crash the runtime
2035 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2036 if (!jit_tls->handling_stack_ovf) {
2037 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2038 jit_tls->handling_stack_ovf = 1;
2040 /*fprintf (stderr, "Already handling stack overflow\n");*/
2049 MonoMethod *omethod;
2051 } PrintOverflowUserData;
2053 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2055 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2057 MonoMethod *method = NULL;
2058 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2061 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2062 method = jinfo_get_method (frame->ji);
2065 if (user_data->count == 0) {
2066 /* The first frame is in its prolog, so a line number cannot be computed */
2067 user_data->count ++;
2071 /* If this is a one method overflow, skip the other instances */
2072 if (method == user_data->omethod)
2075 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2076 mono_runtime_printf_err (" %s", location);
2079 if (user_data->count == 1) {
2080 mono_runtime_printf_err (" <...>");
2081 user_data->omethod = method;
2083 user_data->omethod = NULL;
2086 user_data->count ++;
2088 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2095 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2097 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2098 PrintOverflowUserData ud;
2102 /* we don't do much now, but we can warn the user with a useful message */
2103 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2105 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2106 mono_sigctx_to_monoctx (ctx, &mctx);
2108 mono_runtime_printf_err ("Stacktrace:");
2110 memset (&ud, 0, sizeof (ud));
2112 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2114 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2115 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2117 mono_runtime_printf_err ("At <unmanaged>.");
2124 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2126 MonoMethod *method = NULL;
2128 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2129 method = jinfo_get_method (frame->ji);
2132 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2133 mono_runtime_printf_err (" %s", location);
2136 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2141 static G_GNUC_UNUSED gboolean
2142 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2144 GString *p = (GString*)data;
2145 MonoMethod *method = NULL;
2147 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2148 method = jinfo_get_method (frame->ji);
2150 if (method && frame->domain) {
2151 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2152 g_string_append_printf (p, " %s\n", location);
2155 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2160 #ifndef MONO_CROSS_COMPILE
2162 static gboolean handling_sigsegv = FALSE;
2165 * mono_handle_native_sigsegv:
2167 * Handle a SIGSEGV received while in native code by printing diagnostic
2168 * information and aborting.
2171 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2173 #ifdef MONO_ARCH_USE_SIGACTION
2174 struct sigaction sa;
2176 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2177 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2179 if (handling_sigsegv)
2182 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2183 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2194 /* To prevent infinite loops when the stack walk causes a crash */
2195 handling_sigsegv = TRUE;
2197 /* !jit_tls means the thread was not registered with the runtime */
2198 if (jit_tls && mono_thread_internal_current ()) {
2199 mono_runtime_printf_err ("Stacktrace:\n");
2201 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2202 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2205 #ifdef HAVE_BACKTRACE_SYMBOLS
2211 mono_runtime_printf_err ("\nNative stacktrace:\n");
2213 size = backtrace (array, 256);
2214 names = backtrace_symbols (array, size);
2215 for (i =0; i < size; ++i) {
2216 mono_runtime_printf_err ("\t%s", names [i]);
2220 /* Try to get more meaningful information using gdb */
2222 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2223 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2224 /* From g_spawn_command_line_sync () in eglib */
2227 pid_t crashed_pid = getpid ();
2231 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2232 * it will deadlock. Call the syscall directly instead.
2234 pid = mono_runtime_syscall_fork ();
2235 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2237 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2238 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2239 // distributions set the scope to 1 which allows attaching only to direct children of
2240 // the current process
2241 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2245 dup2 (STDERR_FILENO, STDOUT_FILENO);
2247 mono_gdb_render_native_backtraces (crashed_pid);
2251 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2252 waitpid (pid, &status, 0);
2256 #elif defined (ENABLE_EXTENSION_MODULE)
2257 mono_extension_handle_native_sigsegv (ctx, info);
2261 * A SIGSEGV indicates something went very wrong so we can no longer depend
2262 * on anything working. So try to print out lots of diagnostics, starting
2263 * with ones which have a greater chance of working.
2265 mono_runtime_printf_err (
2267 "=================================================================\n"
2268 "Got a %s while executing native code. This usually indicates\n"
2269 "a fatal error in the mono runtime or one of the native libraries \n"
2270 "used by your application.\n"
2271 "=================================================================\n",
2275 #ifdef MONO_ARCH_USE_SIGACTION
2277 /* Remove our SIGABRT handler */
2278 sa.sa_handler = SIG_DFL;
2279 sigemptyset (&sa.sa_mask);
2282 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2286 if (!mono_do_crash_chaining) {
2287 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2288 #if defined (PLATFORM_ANDROID)
2299 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2301 g_assert_not_reached ();
2304 #endif /* !MONO_CROSS_COMPILE */
2307 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2309 MonoInternalThread *thread = mono_thread_internal_current ();
2310 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2318 GError *error = NULL;
2323 text = g_string_new (0);
2325 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2327 g_string_append_printf (text, "\n\"%s\"", name);
2330 else if (thread->threadpool_thread)
2331 g_string_append (text, "\n\"<threadpool thread>\"");
2333 g_string_append (text, "\n\"<unnamed thread>\"");
2336 wapi_desc = wapi_current_thread_desc ();
2337 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2341 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2343 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2345 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2347 mono_sigctx_to_monoctx (sigctx, &ctx);
2349 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2351 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2354 mono_runtime_printf ("%s", text->str);
2356 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2357 OutputDebugStringA(text->str);
2360 g_string_free (text, TRUE);
2361 mono_runtime_stdout_fflush ();
2365 * mono_print_thread_dump:
2367 * Print information about the current thread to stdout.
2368 * SIGCTX can be NULL, allowing this to be called from gdb.
2371 mono_print_thread_dump (void *sigctx)
2373 mono_print_thread_dump_internal (sigctx, NULL);
2377 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2379 mono_print_thread_dump_internal (NULL, ctx);
2383 * mono_resume_unwind:
2385 * This is called by a trampoline from LLVM compiled finally clauses to continue
2389 mono_resume_unwind (MonoContext *ctx)
2391 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2392 MonoContext new_ctx;
2394 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2395 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2398 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2400 mono_restore_context (&new_ctx);
2403 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2408 MonoJitExceptionInfo *ei;
2409 } FindHandlerBlockData;
2412 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2416 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2417 MonoJitInfo *ji = frame->ji;
2422 ip = MONO_CONTEXT_GET_IP (ctx);
2424 for (i = 0; i < ji->num_clauses; ++i) {
2425 MonoJitExceptionInfo *ei = ji->clauses + i;
2426 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2428 /*If ip points to the first instruction it means the handler block didn't start
2429 so we can leave its execution to the EH machinery*/
2430 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2442 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2445 MonoJitExceptionInfo *clause = NULL;
2448 ip = MONO_CONTEXT_GET_IP (ctx);
2450 for (i = 0; i < ji->num_clauses; ++i) {
2451 clause = &ji->clauses [i];
2452 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2454 if (clause->handler_start < ip && clause->data.handler_end > ip)
2458 /*no matching finally */
2459 if (i == ji->num_clauses)
2462 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2463 if (ip == clause->handler_start)
2466 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2470 * Finds the bottom handler block running and install a block guard if needed.
2471 * FIXME add full-aot support.
2474 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2476 FindHandlerBlockData data = { 0 };
2477 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2484 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2485 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2487 if (!jit_tls || jit_tls->handler_block_return_address)
2490 /* Do an async safe stack walk */
2491 mono_thread_info_set_is_async_context (TRUE);
2492 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2493 mono_thread_info_set_is_async_context (FALSE);
2498 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2500 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2501 if (resume_ip == NULL)
2504 jit_tls->handler_block_return_address = resume_ip;
2505 jit_tls->handler_block = data.ei;
2512 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2520 mono_set_cast_details (MonoClass *from, MonoClass *to)
2522 MonoJitTlsData *jit_tls = NULL;
2524 if (mini_get_debug_options ()->better_cast_details) {
2525 jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2526 jit_tls->class_cast_from = from;
2527 jit_tls->class_cast_to = to;
2532 /*returns false if the thread is not attached*/
2534 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2536 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2537 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2545 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2547 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2548 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2549 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2552 mono_thread_state_init (ctx);
2555 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2561 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2567 mono_thread_state_init (MonoThreadUnwindState *ctx)
2569 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2571 #if defined(MONO_CROSS_COMPILE)
2572 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2573 #elif MONO_ARCH_HAS_MONO_CONTEXT
2574 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2576 g_error ("Use a null sigctx requires a working mono-context");
2579 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2580 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2581 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2587 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2589 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2596 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2597 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2598 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2603 /*returns false if the thread is not attached*/
2605 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2607 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2608 MONO_ARCH_CONTEXT_DEF
2610 mono_arch_flush_register_windows ();
2612 if (!thread || !thread->jit_data) {
2616 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2617 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2619 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2622 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2623 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2624 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2630 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2632 mono_handle_exception (ctx, (MonoObject *)exc);
2633 mono_restore_context (ctx);
2636 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2638 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2640 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2641 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2642 jit_tls->ex_ctx = *ctx;
2644 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2646 g_error ("This target doesn't support mono_arch_setup_async_callback");
2651 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2653 unhandled_exception_hook = func;
2654 unhandled_exception_hook_data = user_data;
2658 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2660 if (unhandled_exception_hook) {
2661 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2663 MonoObject *other = NULL;
2664 MonoString *str = mono_object_to_string (exc, &other);
2668 msg = mono_string_to_utf8 (str);
2670 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2671 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2673 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2674 original_backtrace, nested_backtrace);
2676 g_free (original_backtrace);
2677 g_free (nested_backtrace);
2679 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2681 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2683 #if defined(HOST_IOS)
2684 g_assertion_message ("Terminating runtime due to unhandled exception");
2686 exit (mono_environment_exitcode_get ());
2690 g_assert_not_reached ();
2694 * mono_restore_context:
2696 * Call the architecture specific restore context function.
2699 mono_restore_context (MonoContext *ctx)
2701 static void (*restore_context) (MonoContext *);
2703 if (!restore_context)
2704 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
2705 restore_context (ctx);
2706 g_assert_not_reached ();
2710 * mono_jinfo_get_unwind_info:
2712 * Return the unwind info for JI.
2715 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2718 return mono_aot_get_unwind_info (ji, unwind_info_len);
2720 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2724 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2726 MonoArchEHJitInfo *info;
2728 info = mono_jit_info_get_arch_eh_info (ji);
2731 return info->epilog_size;
2735 * LLVM/Bitcode exception handling.
2738 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2741 static gboolean show_native_addresses = TRUE;
2743 static gboolean show_native_addresses = FALSE;
2746 static _Unwind_Reason_Code
2747 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
2749 MonoDomain *domain = mono_domain_get ();
2750 uintptr_t ip = _Unwind_GetIP (frame_ctx);
2752 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
2753 GList **trace_ips = (GList **)state;
2754 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
2757 return _URC_NO_REASON;
2763 throw_exception (MonoObject *ex, gboolean rethrow)
2765 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2766 MonoException *mono_ex;
2768 if (!mono_object_isinst (ex, mono_defaults.exception_class))
2769 mono_ex = mono_get_exception_runtime_wrapped (ex);
2771 mono_ex = (MonoException*)ex;
2774 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2777 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2778 GList *l, *ips = NULL;
2781 _Unwind_Backtrace (build_stack_trace, &ips);
2782 /* The list contains ip-gshared info pairs */
2784 ips = g_list_reverse (ips);
2785 for (l = ips; l; l = l->next) {
2786 trace = g_list_append (trace, l->data);
2787 trace = g_list_append (trace, NULL);
2789 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace, mono_defaults.int_class));
2791 g_list_free (trace);
2795 mono_llvm_cpp_throw_exception ();
2799 mono_llvm_throw_exception (MonoObject *ex)
2801 throw_exception (ex, FALSE);
2805 mono_llvm_rethrow_exception (MonoObject *ex)
2807 throw_exception (ex, TRUE);
2811 mono_llvm_raise_exception (MonoException *e)
2813 mono_llvm_throw_exception ((MonoObject*)e);
2817 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2819 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2822 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2824 mono_llvm_throw_exception ((MonoObject*)ex);
2828 * mono_llvm_resume_exception:
2830 * Resume exception propagation.
2833 mono_llvm_resume_exception (void)
2835 mono_llvm_cpp_throw_exception ();
2839 * mono_llvm_load_exception:
2841 * Return the currently thrown exception.
2844 mono_llvm_load_exception (void)
2846 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2848 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2850 if (mono_ex->trace_ips) {
2851 GList *trace_ips = NULL;
2852 gpointer ip = __builtin_return_address (0);
2854 size_t upper = mono_array_length (mono_ex->trace_ips);
2856 for (int i = 0; i < upper; i+= 2) {
2857 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2858 gpointer curr_info = mono_array_get (mono_ex->trace_ips, gpointer, i + 1);
2859 trace_ips = g_list_append (trace_ips, curr_ip);
2860 trace_ips = g_list_append (trace_ips, curr_info);
2866 // FIXME: Does this work correctly for rethrows?
2867 // We may be discarding useful information
2868 // when this gets GC'ed
2869 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace_ips, mono_defaults.int_class));
2870 g_list_free (trace_ips);
2873 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2875 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new (mono_domain_get (), mono_defaults.int_class, 0));
2876 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new (mono_domain_get (), mono_defaults.stack_frame_class, 0));
2879 return &mono_ex->object;
2883 * mono_llvm_clear_exception:
2885 * Mark the currently thrown exception as handled.
2888 mono_llvm_clear_exception (void)
2890 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2891 mono_gchandle_free (jit_tls->thrown_exc);
2892 jit_tls->thrown_exc = 0;
2894 mono_memory_barrier ();
2898 * mono_llvm_match_exception:
2900 * Return the innermost clause containing REGION_START-REGION_END which can handle
2901 * the current exception.
2904 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
2906 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2910 g_assert (jit_tls->thrown_exc);
2911 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
2912 for (int i = 0; i < jinfo->num_clauses; i++) {
2913 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
2914 MonoClass *catch_class;
2916 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
2919 catch_class = ei->data.catch_class;
2920 if (catch_class->byval_arg.type == MONO_TYPE_VAR || catch_class->byval_arg.type == MONO_TYPE_MVAR || catch_class->byval_arg.type == MONO_TYPE_GENERICINST) {
2921 MonoGenericContext context;
2922 MonoType *inflated_type;
2924 g_assert (rgctx || this_obj);
2925 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
2926 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
2927 catch_class = mono_class_from_mono_type (inflated_type);
2928 mono_metadata_free_type (inflated_type);
2931 // FIXME: Handle edge cases handled in get_exception_catch_class
2932 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (exc, catch_class)) {
2933 index = ei->clause_index;
2935 } else if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2936 g_assert_not_reached ();
2945 mono_debug_personality (int a, _Unwind_Action b,
2946 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
2948 g_assert_not_reached ();
2952 mono_debug_personality (void);
2955 mono_debug_personality (void)
2957 g_assert_not_reached ();