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)
661 MonoDomain *domain = mono_domain_get ();
663 MonoArray *ta = exc->trace_ips;
664 MonoDebugSourceLocation *location;
668 /* Exception is not thrown yet */
669 return mono_array_new (domain, mono_defaults.stack_frame_class, 0);
672 len = mono_array_length (ta) >> 1;
674 res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0);
676 for (i = skip; i < len; i++) {
678 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, &error);
679 mono_error_raise_exception (&error);
680 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
681 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
684 ji = mono_jit_info_table_find (domain, (char *)ip);
686 /* Unmanaged frame */
687 mono_array_setref (res, i, sf);
691 g_assert (ji != NULL);
693 method = get_method_from_stack_frame (ji, generic_info);
694 if (jinfo_get_method (ji)->wrapper_type) {
698 s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
699 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
703 MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL));
705 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
706 sf->method_address = (gsize) ji->code_start;
707 sf->native_offset = (char *)ip - (char *)ji->code_start;
710 * mono_debug_lookup_source_location() returns both the file / line number information
711 * and the IL offset. Note that computing the IL offset is already an expensive
712 * operation, so we shouldn't call this method twice.
714 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
716 sf->il_offset = location->il_offset;
719 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
720 sf->il_offset = sp.il_offset;
725 if (need_file_info) {
726 if (location && location->source_file) {
727 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
728 sf->line = location->row;
729 sf->column = location->column;
731 sf->line = sf->column = 0;
736 mono_debug_free_source_location (location);
737 mono_array_setref (res, i, sf);
744 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
747 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
748 if (jit_tls && jit_tls->orig_ex_ctx_set)
749 start_ctx = &jit_tls->orig_ex_ctx;
751 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
754 * mono_walk_stack_with_ctx:
756 * Unwind the current thread starting at @start_ctx.
758 * If @start_ctx is null, we capture the current context.
761 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
763 MonoContext extra_ctx;
764 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
765 MONO_ARCH_CONTEXT_DEF
767 if (!thread || !thread->jit_data)
771 mono_arch_flush_register_windows ();
773 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
774 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
776 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
778 start_ctx = &extra_ctx;
781 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
785 * mono_walk_stack_with_state:
787 * Unwind a thread described by @state.
789 * State must be valid (state->valid == TRUE).
791 * If you are using this function to unwind another thread, make sure it is suspended.
793 * If @state is null, we capture the current context.
796 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
798 MonoThreadUnwindState extra_state;
800 g_assert (!mono_thread_info_is_async_context ());
801 if (!mono_thread_state_init_from_current (&extra_state))
803 state = &extra_state;
806 g_assert (state->valid);
808 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
812 mono_walk_stack_full (func,
814 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
815 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
816 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
817 unwind_options, user_data);
821 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
823 MonoThreadUnwindState state;
824 if (!mono_thread_state_init_from_current (&state))
826 mono_walk_stack_with_state (func, &state, options, user_data);
830 * mono_walk_stack_full:
831 * @func: callback to call for each stack frame
832 * @domain: starting appdomain, can be NULL to use the current domain
833 * @unwind_options: what extra information the unwinder should gather
834 * @start_ctx: starting state of the stack walk, can be NULL.
835 * @thread: the thread whose stack to walk, can be NULL to use the current thread
836 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
837 * @user_data: data passed to the callback
839 * This function walks the stack of a thread, starting from the state
840 * represented by start_ctx. For each frame the callback
841 * function is called with the relevant info. The walk ends when no more
842 * managed stack frames are found or when the callback returns a TRUE value.
845 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
848 MonoContext ctx, new_ctx;
849 StackFrameInfo frame;
851 mgreg_t *reg_locations [MONO_MAX_IREGS];
852 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
853 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
854 gboolean async = mono_thread_info_is_async_context ();
856 g_assert (start_ctx);
859 /*The LMF will be null if the target have no managed frames.*/
860 /* g_assert (lmf); */
863 g_assert (unwind_options == MONO_UNWIND_NONE);
865 memcpy (&ctx, start_ctx, sizeof (MonoContext));
866 memset (reg_locations, 0, sizeof (reg_locations));
868 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
870 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
874 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
875 MonoDebugSourceLocation *source;
877 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
879 il_offset = source->il_offset;
882 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
883 il_offset = sp.il_offset;
887 mono_debug_free_source_location (source);
891 frame.il_offset = il_offset;
893 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
894 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
896 frame.actual_method = frame.method;
899 if (get_reg_locations)
900 frame.reg_locations = reg_locations;
902 if (func (&frame, &ctx, user_data))
905 if (get_reg_locations) {
906 for (i = 0; i < MONO_MAX_IREGS; ++i)
907 if (new_reg_locations [i])
908 reg_locations [i] = new_reg_locations [i];
916 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
917 MonoReflectionMethod **method,
918 gint32 *iloffset, gint32 *native_offset,
919 MonoString **file, gint32 *line, gint32 *column)
921 MonoDomain *domain = mono_domain_get ();
922 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
923 MonoLMF *lmf = mono_get_lmf ();
924 MonoJitInfo *ji = NULL;
925 MonoContext ctx, new_ctx;
926 MonoDebugSourceLocation *location;
927 MonoMethod *jmethod = NULL, *actual_method;
928 StackFrameInfo frame;
931 MONO_ARCH_CONTEXT_DEF;
933 mono_arch_flush_register_windows ();
935 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
936 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
938 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
944 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
948 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
949 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
950 frame.type == FRAME_TYPE_TRAMPOLINE)
954 *native_offset = frame.native_offset;
956 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
957 jmethod = jinfo_get_method (ji);
958 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
963 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
965 mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL));
967 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
969 *iloffset = location->il_offset;
973 if (need_file_info) {
975 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
976 *line = location->row;
977 *column = location->column;
984 mono_debug_free_source_location (location);
990 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
992 MonoClass *catch_class = ei->data.catch_class;
993 MonoType *inflated_type;
994 MonoGenericContext context;
996 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
997 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1000 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1002 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1004 /* FIXME: we shouldn't inflate but instead put the
1005 type in the rgctx and fetch it from there. It
1006 might be a good idea to do this lazily, i.e. only
1007 when the exception is actually thrown, so as not to
1008 waste space for exception clauses which might never
1010 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
1011 catch_class = mono_class_from_mono_type (inflated_type);
1012 mono_metadata_free_type (inflated_type);
1018 * mini_jit_info_table_find_ext:
1020 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1021 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1022 * OUT_DOMAIN if it is not NULL.
1025 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1028 MonoInternalThread *t = mono_thread_internal_current ();
1034 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1037 *out_domain = domain;
1041 /* maybe it is shared code, so we also search in the root domain */
1042 if (domain != mono_get_root_domain ()) {
1043 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1046 *out_domain = mono_get_root_domain ();
1054 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1055 for (; refs && *refs; refs++) {
1056 if (*refs != domain && *refs != mono_get_root_domain ()) {
1057 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1060 *out_domain = (MonoDomain*) *refs;
1070 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1072 return mini_jit_info_table_find_ext (domain, addr, TRUE, out_domain);
1076 * wrap_non_exception_throws:
1078 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1079 * WrapNonExceptionThrows flag set.
1082 wrap_non_exception_throws (MonoMethod *m)
1084 MonoAssembly *ass = m->klass->image->assembly;
1085 MonoCustomAttrInfo* attrs;
1086 static MonoClass *klass;
1088 gboolean val = FALSE;
1091 if (ass->wrap_non_exception_throws_inited)
1092 return ass->wrap_non_exception_throws;
1094 klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute");
1096 attrs = mono_custom_attrs_from_assembly (ass);
1098 for (i = 0; i < attrs->num_attrs; ++i) {
1099 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1101 int num_named, named_type, name_len;
1104 if (!attr->ctor || attr->ctor->klass != klass)
1106 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1107 p = (const char*)attr->data;
1108 g_assert (read16 (p) == 0x0001);
1110 num_named = read16 (p);
1116 /* data_type = *p; */
1119 if (named_type != 0x54)
1121 name_len = mono_metadata_decode_blob_size (p, &p);
1122 name = (char *)g_malloc (name_len + 1);
1123 memcpy (name, p, name_len);
1124 name [name_len] = 0;
1126 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1128 /* The value is a BOOLEAN */
1131 mono_custom_attrs_free (attrs);
1134 ass->wrap_non_exception_throws = val;
1135 mono_memory_barrier ();
1136 ass->wrap_non_exception_throws_inited = TRUE;
1141 #ifndef MONO_ARCH_STACK_GROWS_UP
1142 #define DOES_STACK_GROWS_UP 1
1144 #define DOES_STACK_GROWS_UP 0
1147 #define MAX_UNMANAGED_BACKTRACE 128
1149 build_native_trace (void)
1151 /* This puppy only makes sense on mobile, IOW, ARM. */
1152 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1154 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1155 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1160 res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size);
1162 for (i = 0; i < size; i++)
1163 mono_array_set (res, gpointer, i, native_trace [i]);
1171 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1173 if (mono_ex && !initial_trace_ips) {
1174 *trace_ips = g_list_reverse (*trace_ips);
1175 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (*trace_ips, mono_defaults.int_class));
1176 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ());
1177 if (dynamic_methods) {
1178 /* These methods could go away anytime, so save a reference to them in the exception object */
1180 MonoMList *list = NULL;
1182 for (l = dynamic_methods; l; l = l->next) {
1184 MonoDomain *domain = mono_domain_get ();
1186 if (domain->method_to_dyn_method) {
1187 mono_domain_lock (domain);
1188 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1189 mono_domain_unlock (domain);
1191 MonoObject *o = mono_gchandle_get_target (dis_link);
1193 list = mono_mlist_prepend (list, o);
1199 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1202 g_list_free (*trace_ips);
1207 * mono_handle_exception_internal_first_pass:
1209 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1210 * OBJ is found. Run the index of the filter clause which caught the exception into
1211 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1214 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1216 MonoDomain *domain = mono_domain_get ();
1217 MonoJitInfo *ji = NULL;
1218 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1219 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1220 MonoLMF *lmf = mono_get_lmf ();
1221 MonoArray *initial_trace_ips = NULL;
1222 GList *trace_ips = NULL;
1223 GSList *dynamic_methods = NULL;
1224 MonoException *mono_ex;
1225 gboolean stack_overflow = FALSE;
1226 MonoContext initial_ctx;
1228 int frame_count = 0;
1233 g_assert (ctx != NULL);
1235 if (obj == (MonoObject *)domain->stack_overflow_ex)
1236 stack_overflow = TRUE;
1238 mono_ex = (MonoException*)obj;
1239 initial_trace_ips = mono_ex->trace_ips;
1241 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1242 mono_ex = (MonoException*)obj;
1243 initial_trace_ips = mono_ex->trace_ips;
1249 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1251 g_assert (jit_tls->end_of_stack);
1252 g_assert (jit_tls->abort_func);
1255 *out_filter_idx = -1;
1259 *out_prev_ji = NULL;
1264 MonoContext new_ctx;
1266 int clause_index_start = 0;
1267 gboolean unwind_res = TRUE;
1269 StackFrameInfo frame;
1274 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1276 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1277 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1278 frame.type == FRAME_TYPE_TRAMPOLINE) {
1282 g_assert (frame.type == FRAME_TYPE_MANAGED);
1287 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1288 g_slist_free (dynamic_methods);
1293 method = jinfo_get_method (ji);
1294 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1296 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1297 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1298 "The native frame called the managed method:\n%s\n",
1299 mono_method_full_name (method, TRUE));
1302 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1304 * Avoid overwriting the stack trace if the exception is
1305 * rethrown. Also avoid giant stack traces during a stack
1308 if (!initial_trace_ips && (frame_count < 1000)) {
1309 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1310 trace_ips = g_list_prepend (trace_ips,
1311 get_generic_info_from_stack_frame (ji, ctx));
1315 if (method->dynamic)
1316 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1318 if (stack_overflow) {
1319 if (DOES_STACK_GROWS_UP)
1320 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1322 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1324 free_stack = 0xffffff;
1327 for (i = clause_index_start; i < ji->num_clauses; i++) {
1328 MonoJitExceptionInfo *ei = &ji->clauses [i];
1329 gboolean filtered = FALSE;
1332 * During stack overflow, wait till the unwinding frees some stack
1333 * space before running handlers/finalizers.
1335 if (free_stack <= (64 * 1024))
1338 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1340 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1343 * Have to unwrap RuntimeWrappedExceptions if the
1344 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1346 if (non_exception && !wrap_non_exception_throws (method))
1347 ex_obj = non_exception;
1351 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1352 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1353 #ifndef DISABLE_PERFCOUNTERS
1354 mono_perfcounters->exceptions_filters++;
1357 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1358 trim the stackframe since if it returns FALSE we lose information.
1360 FIXME Not 100% sure if it's a good idea even with user clauses.
1363 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1365 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1367 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1369 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1370 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1372 g_assert (!ji->from_llvm);
1373 /* store the exception object in bp + ei->exvar_offset */
1374 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1377 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1379 * Pass the original il clause index to the landing pad so it can
1380 * branch to the landing pad associated with the il clause.
1381 * This is needed because llvm compiled code assumes that the EH
1382 * code always branches to the innermost landing pad.
1385 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1388 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1389 filtered = call_filter (ctx, ei->data.filter);
1390 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1391 if (filtered && out_filter_idx)
1392 *out_filter_idx = filter_idx;
1399 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1400 g_slist_free (dynamic_methods);
1401 /* mono_debugger_agent_handle_exception () needs this */
1402 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1407 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) {
1408 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1409 g_slist_free (dynamic_methods);
1414 /* mono_debugger_agent_handle_exception () needs this */
1415 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1424 g_assert_not_reached ();
1428 * mono_handle_exception_internal:
1429 * @ctx: saved processor state
1430 * @obj: the exception object
1431 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1434 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1436 MonoDomain *domain = mono_domain_get ();
1437 MonoJitInfo *ji, *prev_ji;
1438 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1439 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1440 MonoLMF *lmf = mono_get_lmf ();
1441 MonoException *mono_ex;
1442 gboolean stack_overflow = FALSE;
1443 MonoContext initial_ctx;
1445 int frame_count = 0;
1446 gint32 filter_idx, first_filter_idx = 0;
1449 MonoObject *non_exception = NULL;
1451 g_assert (ctx != NULL);
1453 MonoException *ex = mono_get_exception_null_reference ();
1454 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1455 obj = (MonoObject *)ex;
1459 * Allocate a new exception object instead of the preconstructed ones.
1461 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1463 * It is not a good idea to try and put even more pressure on the little stack available.
1464 * obj = mono_get_exception_stack_overflow ();
1466 stack_overflow = TRUE;
1468 else if (obj == (MonoObject *)domain->null_reference_ex) {
1469 obj = (MonoObject *)mono_get_exception_null_reference ();
1472 if (!mono_object_isinst (obj, mono_defaults.exception_class)) {
1473 non_exception = obj;
1474 obj = (MonoObject *)mono_get_exception_runtime_wrapped (obj);
1477 mono_ex = (MonoException*)obj;
1479 if (mini_get_debug_options ()->suspend_on_exception) {
1480 mono_runtime_printf_err ("Exception thrown, suspending...");
1485 if (mono_object_isinst (obj, mono_defaults.exception_class)) {
1486 mono_ex = (MonoException*)obj;
1491 if (mono_ex && jit_tls->class_cast_from) {
1492 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1493 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1494 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1495 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1496 mono_ex->message = mono_string_new (domain, msg);
1501 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1502 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1503 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1504 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1505 mono_ex->message = mono_string_new (domain, msg);
1513 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1515 g_assert (jit_tls->end_of_stack);
1516 g_assert (jit_tls->abort_func);
1519 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1520 * end up being TRUE on any code path.
1522 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1527 MonoContext ctx_cp = *ctx;
1528 if (mono_trace_is_enabled ()) {
1529 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1530 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1531 MonoObject *message;
1532 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1534 MonoObject *exc = NULL;
1535 if (get_message == NULL) {
1537 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1539 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1541 message = mono_runtime_invoke (get_message, obj, NULL, &exc);
1545 msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)");
1547 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);
1549 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1550 mono_print_thread_dump_from_ctx (ctx);
1552 jit_tls->orig_ex_ctx_set = TRUE;
1553 mono_profiler_exception_thrown (obj);
1554 jit_tls->orig_ex_ctx_set = FALSE;
1556 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1559 if (mini_get_debug_options ()->break_on_exc)
1561 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1563 if (mini_get_debug_options ()->suspend_on_unhandled) {
1564 mono_runtime_printf_err ("Unhandled exception, suspending...");
1569 // FIXME: This runs managed code so it might cause another stack overflow when
1570 // we are handling a stack overflow
1571 mono_unhandled_exception (obj);
1573 gboolean unhandled = FALSE;
1576 * The exceptions caught by the mono_runtime_invoke () calls
1577 * in the threadpool needs to be treated as unhandled (#669836).
1579 * FIXME: The check below is hackish, but its hard to distinguish
1580 * these runtime invoke calls from others in the runtime.
1582 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1583 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1588 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1590 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1600 MonoContext new_ctx;
1602 int clause_index_start = 0;
1603 gboolean unwind_res = TRUE;
1607 ji = jit_tls->resume_state.ji;
1608 new_ctx = jit_tls->resume_state.new_ctx;
1609 clause_index_start = jit_tls->resume_state.clause_index;
1610 lmf = jit_tls->resume_state.lmf;
1611 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1612 filter_idx = jit_tls->resume_state.filter_idx;
1614 StackFrameInfo frame;
1616 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1618 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1619 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1620 frame.type == FRAME_TYPE_TRAMPOLINE) {
1624 g_assert (frame.type == FRAME_TYPE_MANAGED);
1630 *(mono_get_lmf_addr ()) = lmf;
1632 jit_tls->abort_func (obj);
1633 g_assert_not_reached ();
1636 method = jinfo_get_method (ji);
1638 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1640 if (stack_overflow) {
1641 if (DOES_STACK_GROWS_UP)
1642 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1644 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1646 free_stack = 0xffffff;
1649 for (i = clause_index_start; i < ji->num_clauses; i++) {
1650 MonoJitExceptionInfo *ei = &ji->clauses [i];
1651 gboolean filtered = FALSE;
1654 * During stack overflow, wait till the unwinding frees some stack
1655 * space before running handlers/finalizers.
1657 if (free_stack <= (64 * 1024))
1660 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1662 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1665 * Have to unwrap RuntimeWrappedExceptions if the
1666 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1668 if (non_exception && !wrap_non_exception_throws (method))
1669 ex_obj = non_exception;
1673 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1674 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1675 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1677 g_assert (!ji->from_llvm);
1678 /* store the exception object in bp + ei->exvar_offset */
1679 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1683 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1685 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1688 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1690 * Filter clauses should only be run in the
1691 * first pass of exception handling.
1693 filtered = (filter_idx == first_filter_idx);
1697 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1698 mono_object_isinst (ex_obj, catch_class)) || filtered) {
1700 * This guards against the situation that we abort a thread that is executing a finally clause
1701 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1702 * check for this situation here and resume interruption if we are below the guarded block.
1704 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1705 gboolean is_outside = FALSE;
1706 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1707 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1708 //FIXME make this stack direction aware
1709 if (catch_bp > prot_bp) {
1711 } else if (catch_bp == prot_bp) {
1712 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1713 * So we check if the catch handler_start is protected by the guarded handler protected region
1716 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1717 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1718 * There aren't any further finally/fault handler blocks down the stack over this exception.
1719 * This must be ensured by the code that installs the guard trampoline.
1721 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1723 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1728 jit_tls->handler_block_return_address = NULL;
1729 jit_tls->handler_block = NULL;
1730 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1734 if (mono_trace_is_enabled () && mono_trace_eval (method))
1735 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1736 jit_tls->orig_ex_ctx_set = TRUE;
1737 mono_profiler_exception_clause_handler (method, ei->flags, i);
1738 jit_tls->orig_ex_ctx_set = FALSE;
1739 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1741 #ifndef DISABLE_PERFCOUNTERS
1742 mono_perfcounters->exceptions_depth += frame_count;
1744 if (obj == (MonoObject *)domain->stack_overflow_ex)
1745 jit_tls->handling_stack_ovf = FALSE;
1749 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1750 if (mono_trace_is_enabled () && mono_trace_eval (method))
1751 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1752 jit_tls->orig_ex_ctx_set = TRUE;
1753 mono_profiler_exception_clause_handler (method, ei->flags, i);
1754 jit_tls->orig_ex_ctx_set = FALSE;
1755 call_filter (ctx, ei->handler_start);
1757 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1758 if (mono_trace_is_enabled () && mono_trace_eval (method))
1759 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1760 jit_tls->orig_ex_ctx_set = TRUE;
1761 mono_profiler_exception_clause_handler (method, ei->flags, i);
1762 jit_tls->orig_ex_ctx_set = FALSE;
1763 #ifndef DISABLE_PERFCOUNTERS
1764 mono_perfcounters->exceptions_finallys++;
1767 if (ji->from_llvm) {
1769 * LLVM compiled finally handlers follow the design
1770 * of the c++ ehabi, i.e. they call a resume function
1771 * at the end instead of returning to the caller.
1772 * So save the exception handling state,
1773 * mono_resume_unwind () will call us again to continue
1776 jit_tls->resume_state.ex_obj = obj;
1777 jit_tls->resume_state.ji = ji;
1778 jit_tls->resume_state.clause_index = i + 1;
1779 jit_tls->resume_state.ctx = *ctx;
1780 jit_tls->resume_state.new_ctx = new_ctx;
1781 jit_tls->resume_state.lmf = lmf;
1782 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1783 jit_tls->resume_state.filter_idx = filter_idx;
1784 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1787 call_filter (ctx, ei->handler_start);
1793 jit_tls->orig_ex_ctx_set = TRUE;
1794 mono_profiler_exception_method_leave (method);
1795 jit_tls->orig_ex_ctx_set = FALSE;
1800 g_assert_not_reached ();
1804 * mono_debugger_run_finally:
1805 * @start_ctx: saved processor state
1807 * This method is called by the Mono Debugger to call all `finally' clauses of the
1808 * current stack frame. It's used when the user issues a `return' command to make
1809 * the current stack frame return. After returning from this method, the debugger
1810 * unwinds the stack one frame and gives control back to the user.
1812 * NOTE: This method is only used when running inside the Mono Debugger.
1815 mono_debugger_run_finally (MonoContext *start_ctx)
1817 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1818 MonoDomain *domain = mono_domain_get ();
1819 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1820 MonoLMF *lmf = mono_get_lmf ();
1821 MonoContext ctx, new_ctx;
1822 MonoJitInfo *ji, rji;
1827 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1828 if (!ji || ji == (gpointer)-1)
1832 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
1834 for (i = 0; i < ji->num_clauses; i++) {
1835 MonoJitExceptionInfo *ei = &ji->clauses [i];
1837 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
1838 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
1839 call_filter (&ctx, ei->handler_start);
1845 * mono_handle_exception:
1846 * @ctx: saved processor state
1847 * @obj: the exception object
1850 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
1852 #ifndef DISABLE_PERFCOUNTERS
1853 mono_perfcounters->exceptions_thrown++;
1856 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
1859 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
1861 #ifndef MONO_ARCH_USE_SIGACTION
1862 #error "Can't use sigaltstack without sigaction"
1865 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
1868 mono_setup_altstack (MonoJitTlsData *tls)
1872 guint8 *staddr = NULL;
1874 if (mono_running_on_valgrind ())
1877 mono_thread_info_get_stack_bounds (&staddr, &stsize);
1881 tls->end_of_stack = staddr + stsize;
1882 tls->stack_size = stsize;
1884 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
1886 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
1887 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
1889 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
1891 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
1892 /* mprotect can fail for the main thread stack */
1893 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);
1894 g_assert (gaddr == tls->stack_ovf_guard_base);
1895 tls->stack_ovf_valloced = TRUE;
1898 /* Setup an alternate signal stack */
1899 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
1900 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1902 g_assert (tls->signal_stack);
1904 sa.ss_sp = tls->signal_stack;
1905 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1907 g_assert (sigaltstack (&sa, NULL) == 0);
1909 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);
1913 mono_free_altstack (MonoJitTlsData *tls)
1918 sa.ss_sp = tls->signal_stack;
1919 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
1920 sa.ss_flags = SS_DISABLE;
1921 err = sigaltstack (&sa, NULL);
1922 g_assert (err == 0);
1924 if (tls->signal_stack)
1925 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
1926 if (tls->stack_ovf_valloced)
1927 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
1929 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
1932 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1935 mono_setup_altstack (MonoJitTlsData *tls)
1940 mono_free_altstack (MonoJitTlsData *tls)
1944 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
1947 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
1949 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
1950 /* we need to leave some room for throwing the exception */
1951 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
1952 unprotect_size -= mono_pagesize ();
1953 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
1954 * is sufficient stack
1956 //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);
1958 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
1959 return unprotect_size == jit_tls->stack_ovf_guard_size;
1962 static G_GNUC_UNUSED void
1963 try_more_restore (void)
1965 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1966 if (try_restore_stack_protection (jit_tls, 500))
1967 jit_tls->restore_stack_prot = NULL;
1970 static G_GNUC_UNUSED void
1971 restore_stack_protection (void)
1973 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1974 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
1975 /* if we can't restore the stack protection, keep a callback installed so
1976 * we'll try to restore as much stack as we can at each return from unmanaged
1979 if (try_restore_stack_protection (jit_tls, 4096))
1980 jit_tls->restore_stack_prot = NULL;
1982 jit_tls->restore_stack_prot = try_more_restore_tramp;
1983 /* here we also throw a stack overflow exception */
1984 ex->trace_ips = NULL;
1985 ex->stack_trace = NULL;
1986 mono_raise_exception (ex);
1990 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
1992 void (*func)(void) = (void (*)(void))tramp_data;
1998 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2003 /* we got a stack overflow in the soft-guard pages
2004 * There are two cases:
2005 * 1) managed code caused the overflow: we unprotect the soft-guard page
2006 * and let the arch-specific code trigger the exception handling mechanism
2007 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2008 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2009 * and hope we can continue with those enabled, at least until the hard-guard page
2010 * is hit. The alternative to continuing here is to just print a message and abort.
2011 * We may add in the future the code to protect the pages again in the codepath
2012 * when we return from unmanaged to managed code.
2014 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2015 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2016 /* we unprotect the minimum amount we can */
2018 gboolean handled = FALSE;
2020 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2021 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2022 guard_size -= mono_pagesize ();
2024 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2025 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2026 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);
2027 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2029 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2034 /* We print a message: after this even managed stack overflows
2035 * may crash the runtime
2037 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2038 if (!jit_tls->handling_stack_ovf) {
2039 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2040 jit_tls->handling_stack_ovf = 1;
2042 /*fprintf (stderr, "Already handling stack overflow\n");*/
2051 MonoMethod *omethod;
2053 } PrintOverflowUserData;
2055 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2057 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2059 MonoMethod *method = NULL;
2060 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2063 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2064 method = jinfo_get_method (frame->ji);
2067 if (user_data->count == 0) {
2068 /* The first frame is in its prolog, so a line number cannot be computed */
2069 user_data->count ++;
2073 /* If this is a one method overflow, skip the other instances */
2074 if (method == user_data->omethod)
2077 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2078 mono_runtime_printf_err (" %s", location);
2081 if (user_data->count == 1) {
2082 mono_runtime_printf_err (" <...>");
2083 user_data->omethod = method;
2085 user_data->omethod = NULL;
2088 user_data->count ++;
2090 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2097 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2099 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2100 PrintOverflowUserData ud;
2104 /* we don't do much now, but we can warn the user with a useful message */
2105 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2107 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2108 mono_sigctx_to_monoctx (ctx, &mctx);
2110 mono_runtime_printf_err ("Stacktrace:");
2112 memset (&ud, 0, sizeof (ud));
2114 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2116 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2117 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2119 mono_runtime_printf_err ("At <unmanaged>.");
2126 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2128 MonoMethod *method = NULL;
2130 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2131 method = jinfo_get_method (frame->ji);
2134 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2135 mono_runtime_printf_err (" %s", location);
2138 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2143 static G_GNUC_UNUSED gboolean
2144 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2146 GString *p = (GString*)data;
2147 MonoMethod *method = NULL;
2149 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2150 method = jinfo_get_method (frame->ji);
2152 if (method && frame->domain) {
2153 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2154 g_string_append_printf (p, " %s\n", location);
2157 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2162 #ifndef MONO_CROSS_COMPILE
2164 static gboolean handling_sigsegv = FALSE;
2167 * mono_handle_native_sigsegv:
2169 * Handle a SIGSEGV received while in native code by printing diagnostic
2170 * information and aborting.
2173 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2175 #ifdef MONO_ARCH_USE_SIGACTION
2176 struct sigaction sa;
2178 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2179 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2181 if (handling_sigsegv)
2184 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2185 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2196 /* To prevent infinite loops when the stack walk causes a crash */
2197 handling_sigsegv = TRUE;
2199 /* !jit_tls means the thread was not registered with the runtime */
2200 if (jit_tls && mono_thread_internal_current ()) {
2201 mono_runtime_printf_err ("Stacktrace:\n");
2203 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2204 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2207 #ifdef HAVE_BACKTRACE_SYMBOLS
2213 mono_runtime_printf_err ("\nNative stacktrace:\n");
2215 size = backtrace (array, 256);
2216 names = backtrace_symbols (array, size);
2217 for (i =0; i < size; ++i) {
2218 mono_runtime_printf_err ("\t%s", names [i]);
2222 /* Try to get more meaningful information using gdb */
2224 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2225 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2226 /* From g_spawn_command_line_sync () in eglib */
2229 pid_t crashed_pid = getpid ();
2233 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2234 * it will deadlock. Call the syscall directly instead.
2236 pid = mono_runtime_syscall_fork ();
2237 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2239 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2240 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2241 // distributions set the scope to 1 which allows attaching only to direct children of
2242 // the current process
2243 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2247 dup2 (STDERR_FILENO, STDOUT_FILENO);
2249 mono_gdb_render_native_backtraces (crashed_pid);
2253 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2254 waitpid (pid, &status, 0);
2258 #elif defined (ENABLE_EXTENSION_MODULE)
2259 mono_extension_handle_native_sigsegv (ctx, info);
2263 * A SIGSEGV indicates something went very wrong so we can no longer depend
2264 * on anything working. So try to print out lots of diagnostics, starting
2265 * with ones which have a greater chance of working.
2267 mono_runtime_printf_err (
2269 "=================================================================\n"
2270 "Got a %s while executing native code. This usually indicates\n"
2271 "a fatal error in the mono runtime or one of the native libraries \n"
2272 "used by your application.\n"
2273 "=================================================================\n",
2277 #ifdef MONO_ARCH_USE_SIGACTION
2279 /* Remove our SIGABRT handler */
2280 sa.sa_handler = SIG_DFL;
2281 sigemptyset (&sa.sa_mask);
2284 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2288 if (!mono_do_crash_chaining) {
2289 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2290 #if defined (PLATFORM_ANDROID)
2301 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2303 g_assert_not_reached ();
2306 #endif /* !MONO_CROSS_COMPILE */
2309 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2311 MonoInternalThread *thread = mono_thread_internal_current ();
2312 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2320 GError *error = NULL;
2325 text = g_string_new (0);
2327 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2329 g_string_append_printf (text, "\n\"%s\"", name);
2332 else if (thread->threadpool_thread)
2333 g_string_append (text, "\n\"<threadpool thread>\"");
2335 g_string_append (text, "\n\"<unnamed thread>\"");
2338 wapi_desc = wapi_current_thread_desc ();
2339 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2343 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2345 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2347 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2349 mono_sigctx_to_monoctx (sigctx, &ctx);
2351 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2353 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2356 mono_runtime_printf ("%s", text->str);
2358 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2359 OutputDebugStringA(text->str);
2362 g_string_free (text, TRUE);
2363 mono_runtime_stdout_fflush ();
2367 * mono_print_thread_dump:
2369 * Print information about the current thread to stdout.
2370 * SIGCTX can be NULL, allowing this to be called from gdb.
2373 mono_print_thread_dump (void *sigctx)
2375 mono_print_thread_dump_internal (sigctx, NULL);
2379 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2381 mono_print_thread_dump_internal (NULL, ctx);
2385 * mono_resume_unwind:
2387 * This is called by a trampoline from LLVM compiled finally clauses to continue
2391 mono_resume_unwind (MonoContext *ctx)
2393 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2394 MonoContext new_ctx;
2396 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2397 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2400 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2402 mono_restore_context (&new_ctx);
2405 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2410 MonoJitExceptionInfo *ei;
2411 } FindHandlerBlockData;
2414 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2418 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2419 MonoJitInfo *ji = frame->ji;
2424 ip = MONO_CONTEXT_GET_IP (ctx);
2426 for (i = 0; i < ji->num_clauses; ++i) {
2427 MonoJitExceptionInfo *ei = ji->clauses + i;
2428 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2430 /*If ip points to the first instruction it means the handler block didn't start
2431 so we can leave its execution to the EH machinery*/
2432 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2444 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2447 MonoJitExceptionInfo *clause = NULL;
2450 ip = MONO_CONTEXT_GET_IP (ctx);
2452 for (i = 0; i < ji->num_clauses; ++i) {
2453 clause = &ji->clauses [i];
2454 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2456 if (clause->handler_start < ip && clause->data.handler_end > ip)
2460 /*no matching finally */
2461 if (i == ji->num_clauses)
2464 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2465 if (ip == clause->handler_start)
2468 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2472 * Finds the bottom handler block running and install a block guard if needed.
2473 * FIXME add full-aot support.
2476 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2478 FindHandlerBlockData data = { 0 };
2479 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2486 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2487 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2489 if (!jit_tls || jit_tls->handler_block_return_address)
2492 /* Do an async safe stack walk */
2493 mono_thread_info_set_is_async_context (TRUE);
2494 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2495 mono_thread_info_set_is_async_context (FALSE);
2500 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2502 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2503 if (resume_ip == NULL)
2506 jit_tls->handler_block_return_address = resume_ip;
2507 jit_tls->handler_block = data.ei;
2514 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2522 mono_set_cast_details (MonoClass *from, MonoClass *to)
2524 MonoJitTlsData *jit_tls = NULL;
2526 if (mini_get_debug_options ()->better_cast_details) {
2527 jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2528 jit_tls->class_cast_from = from;
2529 jit_tls->class_cast_to = to;
2534 /*returns false if the thread is not attached*/
2536 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2538 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2539 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2547 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2549 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2550 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2551 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2554 mono_thread_state_init (ctx);
2557 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2563 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2569 mono_thread_state_init (MonoThreadUnwindState *ctx)
2571 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2573 #if defined(MONO_CROSS_COMPILE)
2574 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2575 #elif MONO_ARCH_HAS_MONO_CONTEXT
2576 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2578 g_error ("Use a null sigctx requires a working mono-context");
2581 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2582 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2583 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2589 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2591 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2598 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2599 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2600 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2605 /*returns false if the thread is not attached*/
2607 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2609 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2610 MONO_ARCH_CONTEXT_DEF
2612 mono_arch_flush_register_windows ();
2614 if (!thread || !thread->jit_data) {
2618 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2619 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2621 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2624 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2625 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2626 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2632 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2634 mono_handle_exception (ctx, (MonoObject *)exc);
2635 mono_restore_context (ctx);
2638 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2640 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2642 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2643 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2644 jit_tls->ex_ctx = *ctx;
2646 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2648 g_error ("This target doesn't support mono_arch_setup_async_callback");
2653 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2655 unhandled_exception_hook = func;
2656 unhandled_exception_hook_data = user_data;
2660 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2662 if (unhandled_exception_hook) {
2663 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2665 MonoObject *other = NULL;
2666 MonoString *str = mono_object_to_string (exc, &other);
2670 msg = mono_string_to_utf8 (str);
2672 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2673 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2675 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2676 original_backtrace, nested_backtrace);
2678 g_free (original_backtrace);
2679 g_free (nested_backtrace);
2681 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2683 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2685 #if defined(HOST_IOS)
2686 g_assertion_message ("Terminating runtime due to unhandled exception");
2688 exit (mono_environment_exitcode_get ());
2692 g_assert_not_reached ();
2696 * mono_restore_context:
2698 * Call the architecture specific restore context function.
2701 mono_restore_context (MonoContext *ctx)
2703 static void (*restore_context) (MonoContext *);
2705 if (!restore_context)
2706 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
2707 restore_context (ctx);
2708 g_assert_not_reached ();
2712 * mono_jinfo_get_unwind_info:
2714 * Return the unwind info for JI.
2717 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2720 return mono_aot_get_unwind_info (ji, unwind_info_len);
2722 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2726 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2728 MonoArchEHJitInfo *info;
2730 info = mono_jit_info_get_arch_eh_info (ji);
2733 return info->epilog_size;
2737 * LLVM/Bitcode exception handling.
2740 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2743 static gboolean show_native_addresses = TRUE;
2745 static gboolean show_native_addresses = FALSE;
2748 static _Unwind_Reason_Code
2749 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
2751 MonoDomain *domain = mono_domain_get ();
2752 uintptr_t ip = _Unwind_GetIP (frame_ctx);
2754 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
2755 GList **trace_ips = (GList **)state;
2756 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
2759 return _URC_NO_REASON;
2765 throw_exception (MonoObject *ex, gboolean rethrow)
2767 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2768 MonoException *mono_ex;
2770 if (!mono_object_isinst (ex, mono_defaults.exception_class))
2771 mono_ex = mono_get_exception_runtime_wrapped (ex);
2773 mono_ex = (MonoException*)ex;
2776 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2779 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2780 GList *l, *ips = NULL;
2783 _Unwind_Backtrace (build_stack_trace, &ips);
2784 /* The list contains gshared info-ip pairs */
2786 ips = g_list_reverse (ips);
2787 for (l = ips; l; l = l->next) {
2789 trace = g_list_append (trace, l->data);
2790 trace = g_list_append (trace, NULL);
2792 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace, mono_defaults.int_class));
2794 g_list_free (trace);
2798 mono_llvm_cpp_throw_exception ();
2802 mono_llvm_throw_exception (MonoObject *ex)
2804 throw_exception (ex, FALSE);
2808 mono_llvm_rethrow_exception (MonoObject *ex)
2810 throw_exception (ex, TRUE);
2814 mono_llvm_raise_exception (MonoException *e)
2816 mono_llvm_throw_exception ((MonoObject*)e);
2820 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2822 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2825 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2827 mono_llvm_throw_exception ((MonoObject*)ex);
2831 * mono_llvm_resume_exception:
2833 * Resume exception propagation.
2836 mono_llvm_resume_exception (void)
2838 mono_llvm_cpp_throw_exception ();
2842 * mono_llvm_load_exception:
2844 * Return the currently thrown exception.
2847 mono_llvm_load_exception (void)
2849 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2851 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
2853 if (mono_ex->trace_ips) {
2854 GList *trace_ips = NULL;
2855 gpointer ip = __builtin_return_address (0);
2857 size_t upper = mono_array_length (mono_ex->trace_ips);
2859 for (int i = 0; i < upper; i++) {
2860 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
2861 trace_ips = g_list_prepend (trace_ips, curr_ip);
2867 // FIXME: Does this work correctly for rethrows?
2868 // We may be discarding useful information
2869 // when this gets GC'ed
2870 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_glist_to_array (trace_ips, mono_defaults.int_class));
2871 g_list_free (trace_ips);
2874 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
2876 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new (mono_domain_get (), mono_defaults.int_class, 0));
2877 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new (mono_domain_get (), mono_defaults.stack_frame_class, 0));
2880 return &mono_ex->object;
2884 * mono_llvm_clear_exception:
2886 * Mark the currently thrown exception as handled.
2889 mono_llvm_clear_exception (void)
2891 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2892 mono_gchandle_free (jit_tls->thrown_exc);
2893 jit_tls->thrown_exc = 0;
2895 mono_memory_barrier ();
2899 * mono_llvm_match_exception:
2901 * Return the innermost clause containing REGION_START-REGION_END which can handle
2902 * the current exception.
2905 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
2907 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2911 g_assert (jit_tls->thrown_exc);
2912 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
2913 for (int i = 0; i < jinfo->num_clauses; i++) {
2914 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
2915 MonoClass *catch_class;
2917 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
2920 catch_class = ei->data.catch_class;
2921 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) {
2922 MonoGenericContext context;
2923 MonoType *inflated_type;
2925 g_assert (rgctx || this_obj);
2926 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
2927 inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context);
2928 catch_class = mono_class_from_mono_type (inflated_type);
2929 mono_metadata_free_type (inflated_type);
2932 // FIXME: Handle edge cases handled in get_exception_catch_class
2933 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (exc, catch_class)) {
2934 index = ei->clause_index;
2936 } else if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2937 g_assert_not_reached ();
2946 mono_debug_personality (int a, _Unwind_Action b,
2947 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
2949 g_assert_not_reached ();
2953 mono_debug_personality (void);
2956 mono_debug_personality (void)
2958 g_assert_not_reached ();