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).
11 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
22 #ifdef HAVE_EXECINFO_H
26 #ifdef HAVE_SYS_TYPES_H
27 #include <sys/types.h>
30 #ifdef HAVE_SYS_WAIT_H
38 #ifdef HAVE_SYS_SYSCALL_H
39 #include <sys/syscall.h>
42 #ifdef HAVE_SYS_PRCTL_H
43 #include <sys/prctl.h>
50 #include <mono/metadata/appdomain.h>
51 #include <mono/metadata/tabledefs.h>
52 #include <mono/metadata/threads.h>
53 #include <mono/metadata/threads-types.h>
54 #include <mono/metadata/debug-helpers.h>
55 #include <mono/metadata/exception.h>
56 #include <mono/metadata/exception-internals.h>
57 #include <mono/metadata/object-internals.h>
58 #include <mono/metadata/reflection-internals.h>
59 #include <mono/metadata/gc-internals.h>
60 #include <mono/metadata/mono-debug.h>
61 #include <mono/metadata/profiler.h>
62 #include <mono/metadata/mono-endian.h>
63 #include <mono/metadata/environment.h>
64 #include <mono/metadata/mono-mlist.h>
65 #include <mono/utils/mono-mmap.h>
66 #include <mono/utils/mono-logger-internals.h>
67 #include <mono/utils/mono-error.h>
68 #include <mono/utils/mono-error-internals.h>
72 #include "debugger-agent.h"
73 #include "seq-points.h"
74 #include "llvm-runtime.h"
75 #include "mini-llvm.h"
78 #include "mini-llvm-cpp.h"
81 #ifndef MONO_ARCH_CONTEXT_DEF
82 #define MONO_ARCH_CONTEXT_DEF
85 static gpointer restore_context_func, call_filter_func;
86 static gpointer throw_exception_func, rethrow_exception_func;
87 static gpointer throw_corlib_exception_func;
89 static gpointer try_more_restore_tramp = NULL;
90 static gpointer restore_stack_protection_tramp = NULL;
92 static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL;
93 static gpointer unhandled_exception_hook_data = NULL;
95 static void try_more_restore (void);
96 static void restore_stack_protection (void);
97 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
98 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
99 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
102 mono_exceptions_init (void)
104 MonoRuntimeExceptionHandlingCallbacks cbs;
106 restore_context_func = mono_aot_get_trampoline ("restore_context");
107 call_filter_func = mono_aot_get_trampoline ("call_filter");
108 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
109 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
113 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
114 mono_tramp_info_register (info, NULL);
115 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
116 mono_tramp_info_register (info, NULL);
117 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
118 mono_tramp_info_register (info, NULL);
119 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
120 mono_tramp_info_register (info, NULL);
122 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
123 if (!mono_llvm_only) {
124 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
125 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
129 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
130 mono_arch_exceptions_init ();
132 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
133 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
136 cbs.mono_raise_exception = mono_llvm_raise_exception;
138 cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
139 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
140 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
141 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
142 mono_install_eh_callbacks (&cbs);
146 mono_get_throw_exception (void)
148 g_assert (throw_exception_func);
149 return throw_exception_func;
153 mono_get_rethrow_exception (void)
155 g_assert (rethrow_exception_func);
156 return rethrow_exception_func;
160 mono_get_call_filter (void)
162 g_assert (call_filter_func);
163 return call_filter_func;
167 mono_get_restore_context (void)
169 g_assert (restore_context_func);
170 return restore_context_func;
174 mono_get_throw_corlib_exception (void)
176 gpointer code = NULL;
179 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
180 if (throw_corlib_exception_func)
181 return throw_corlib_exception_func;
184 code = mono_aot_get_trampoline ("throw_corlib_exception");
186 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
187 mono_tramp_info_register (info, NULL);
190 mono_memory_barrier ();
192 throw_corlib_exception_func = code;
194 return throw_corlib_exception_func;
198 * mono_get_throw_exception_addr:
200 * Return an address which stores the result of
201 * mono_get_throw_exception.
204 mono_get_throw_exception_addr (void)
206 return &throw_exception_func;
210 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
212 MonoTryBlockHoleTableJitInfo *table;
217 if (ei->try_start > ip || ip >= ei->try_end)
220 if (!ji->has_try_block_holes)
223 table = mono_jit_info_get_try_block_hole_table_info (ji);
224 offset = (guint32)((char*)ip - (char*)ji->code_start);
225 clause = (guint16)(ei - ji->clauses);
226 g_assert (clause < ji->num_clauses);
228 for (i = 0; i < table->num_holes; ++i) {
229 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
230 if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset)
236 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
239 static gboolean show_native_addresses = TRUE;
241 static gboolean show_native_addresses = FALSE;
244 static _Unwind_Reason_Code
245 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
247 MonoDomain *domain = mono_domain_get ();
248 uintptr_t ip = _Unwind_GetIP (frame_ctx);
250 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
251 GList **trace_ips = (GList **)state;
252 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
255 return _URC_NO_REASON;
259 get_unwind_backtrace (void)
263 _Unwind_Backtrace (build_stack_trace, &ips);
265 return g_slist_reverse (ips);
271 get_unwind_backtrace (void)
281 * Translate between the mono_arch_unwind_frame function and the old API.
284 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
285 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
287 StackFrameInfo frame;
290 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
292 /* Avoid costly table lookup during stack overflow */
293 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
296 ji = mini_jit_info_table_find (domain, (char *)ip, NULL);
301 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
303 return (MonoJitInfo *)-1;
305 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
307 * Remove any unused lmf.
308 * Mask out the lower bits which might be used to hold additional information.
310 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
313 /* Convert between the new and the old APIs */
314 switch (frame.type) {
315 case FRAME_TYPE_MANAGED:
319 case FRAME_TYPE_TRAMPOLINE:
321 case FRAME_TYPE_MANAGED_TO_NATIVE:
325 memset (res, 0, sizeof (MonoJitInfo));
326 res->d.method = frame.method;
329 case FRAME_TYPE_DEBUGGER_INVOKE: {
333 * The normal exception handling code can't handle this frame, so just
336 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
337 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
341 g_assert_not_reached ();
346 /* mono_find_jit_info:
348 * This function is used to gather information from @ctx. It return the
349 * MonoJitInfo of the corresponding function, unwinds one stack frame and
350 * stores the resulting context into @new_ctx. It also stores a string
351 * describing the stack location into @trace (if not NULL), and modifies
352 * the @lmf if necessary. @native_offset return the IP offset from the
353 * start of the function or -1 if that info is not available.
356 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
357 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
361 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
363 MonoMethod *method = NULL;
374 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
376 if (ji == (gpointer)-1)
379 if (ji && !ji->is_trampoline)
380 method = jinfo_get_method (ji);
382 if (managed2 || (method && method->wrapper_type)) {
383 const char *real_ip, *start;
386 start = (const char *)ji->code_start;
388 /* ctx->ip points into native code */
389 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
391 real_ip = (const char*)ip;
393 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
394 offset = real_ip - start;
399 *native_offset = offset;
402 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
406 *trace = mono_debug_print_stack_frame (method, offset, domain);
409 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
410 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
419 * mono_find_jit_info_ext:
421 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
423 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
424 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
425 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
426 * to obtain the last managed frame.
427 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
428 * On return, it will be filled with the locations where callee saved registers are saved
429 * by the current frame. This is returned outside of StackFrameInfo because it can be
430 * quite large on some platforms.
431 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
435 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
436 MonoJitInfo *prev_ji, MonoContext *ctx,
437 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
438 mgreg_t **save_locations,
439 StackFrameInfo *frame)
442 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
444 MonoDomain *target_domain = domain;
445 MonoMethod *method = NULL;
446 gboolean async = mono_thread_info_is_async_context ();
451 /* Avoid costly table lookup during stack overflow */
452 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
455 ji = mini_jit_info_table_find (domain, (char *)ip, &target_domain);
458 target_domain = domain;
461 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
463 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
467 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
469 * Remove any unused lmf.
470 * Mask out the lower bits which might be used to hold additional information.
472 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
475 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
476 method = jinfo_get_method (frame->ji);
478 if (frame->type == FRAME_TYPE_MANAGED && method) {
479 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
480 frame->managed = TRUE;
483 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
485 * This type of frame is just a marker, the caller should unwind once more to get the
486 * last managed frame.
489 frame->method = NULL;
492 frame->native_offset = -1;
493 frame->domain = target_domain;
494 frame->async_context = async;
498 if (frame->type == FRAME_TYPE_MANAGED)
499 frame->method = method;
501 if (ji && (frame->managed || (method && method->wrapper_type))) {
502 const char *real_ip, *start;
504 start = (const char *)ji->code_start;
505 if (frame->type == FRAME_TYPE_MANAGED)
506 real_ip = (const char*)ip;
508 /* ctx->ip points into native code */
509 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
511 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
512 frame->native_offset = real_ip - start;
514 frame->native_offset = -1;
518 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
520 if (trace && frame->method) {
521 char *fname = mono_method_full_name (frame->method, TRUE);
522 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
531 * This function is async-safe.
534 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
536 MonoGenericJitInfo *gi;
540 if (!ji->has_generic_jit_info)
542 gi = mono_jit_info_get_generic_jit_info (ji);
548 * Search location list if available, it contains the precise location of the
549 * argument for every pc offset, even if the method was interrupted while it was in
553 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
556 for (i = 0; i < gi->nlocs; ++i) {
557 MonoDwarfLocListEntry *entry = &gi->locations [i];
559 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
561 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
563 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
567 g_assert (i < gi->nlocs);
570 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
572 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
576 method = jinfo_get_method (ji);
577 if (mono_method_get_context (method)->method_inst) {
578 /* A MonoMethodRuntimeGenericContext* */
580 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
584 /* Avoid returning a managed object */
585 MonoObject *this_obj = (MonoObject *)info;
587 return this_obj->vtable;
592 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
594 static MonoGenericContext
595 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
597 MonoGenericContext context = { NULL, NULL };
598 MonoClass *klass, *method_container_class;
601 g_assert (generic_info);
603 method = jinfo_get_method (ji);
604 g_assert (method->is_inflated);
605 if (mono_method_get_context (method)->method_inst) {
606 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
608 klass = mrgctx->class_vtable->klass;
609 context.method_inst = mrgctx->method_inst;
610 g_assert (context.method_inst);
612 MonoVTable *vtable = (MonoVTable *)generic_info;
614 klass = vtable->klass;
617 //g_assert (!method->klass->generic_container);
618 if (method->klass->generic_class)
619 method_container_class = method->klass->generic_class->container_class;
621 method_container_class = method->klass;
623 /* class might refer to a subclass of method's class */
624 while (!(klass == method->klass || (klass->generic_class && klass->generic_class->container_class == method_container_class))) {
625 klass = klass->parent;
629 if (klass->generic_class || klass->generic_container)
630 context.class_inst = mini_class_get_context (klass)->class_inst;
632 if (klass->generic_class)
633 g_assert (mono_class_has_parent_and_ignore_generics (klass->generic_class->container_class, method_container_class));
635 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
641 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
644 MonoGenericContext context;
647 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
648 return jinfo_get_method (ji);
649 context = get_generic_context_from_stack_frame (ji, generic_info);
651 method = jinfo_get_method (ji);
652 method = mono_method_get_declaring_generic_method (method);
653 method = mono_class_inflate_generic_method_checked (method, &context, &error);
654 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
660 * mono_exception_walk_native_trace:
661 * @ex: The exception object whose frames should be walked
662 * @func: callback to call for each stack frame
663 * @user_data: data passed to the callback
665 * This function walks the stacktrace of an exception. For
666 * each frame the callback function is called with the relevant info.
667 * The walk ends when no more stack frames are found or when the callback
668 * returns a TRUE value.
672 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
674 MONO_REQ_GC_UNSAFE_MODE;
676 MonoDomain *domain = mono_domain_get ();
677 MonoArray *ta = ex->trace_ips;
683 len = mono_array_length (ta) >> 1;
684 for (i = 0; i < len; i++) {
685 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
686 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
687 MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)ip);
690 if (func (NULL, ip, 0, FALSE, user_data))
693 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
694 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
703 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
706 MonoDomain *domain = mono_domain_get ();
708 MonoArray *ta = exc->trace_ips;
709 MonoDebugSourceLocation *location;
713 /* Exception is not thrown yet */
714 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, &error);
715 mono_error_set_pending_exception (&error);
719 len = mono_array_length (ta) >> 1;
721 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, &error);
722 if (mono_error_set_pending_exception (&error))
725 for (i = skip; i < len; i++) {
727 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, &error);
728 if (!mono_error_ok (&error)) {
729 mono_error_set_pending_exception (&error);
732 gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0);
733 gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1);
736 ji = mono_jit_info_table_find (domain, (char *)ip);
738 /* Unmanaged frame */
739 mono_array_setref (res, i, sf);
743 g_assert (ji != NULL);
746 /* Can't resolve actual method */
747 method = jinfo_get_method (ji);
749 method = get_method_from_stack_frame (ji, generic_info);
750 if (jinfo_get_method (ji)->wrapper_type) {
754 s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
755 MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s));
759 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, &error);
760 if (!mono_error_ok (&error)) {
761 mono_error_set_pending_exception (&error);
764 MONO_OBJECT_SETREF (sf, method, rm);
767 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
768 sf->method_address = (gsize) ji->code_start;
769 sf->native_offset = (char *)ip - (char *)ji->code_start;
772 * mono_debug_lookup_source_location() returns both the file / line number information
773 * and the IL offset. Note that computing the IL offset is already an expensive
774 * operation, so we shouldn't call this method twice.
776 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
778 sf->il_offset = location->il_offset;
781 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
782 sf->il_offset = sp.il_offset;
787 if (need_file_info) {
788 if (location && location->source_file) {
789 MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file));
790 sf->line = location->row;
791 sf->column = location->column;
793 sf->line = sf->column = 0;
798 mono_debug_free_source_location (location);
799 mono_array_setref (res, i, sf);
806 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
809 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
810 if (jit_tls && jit_tls->orig_ex_ctx_set)
811 start_ctx = &jit_tls->orig_ex_ctx;
813 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
816 * mono_walk_stack_with_ctx:
818 * Unwind the current thread starting at @start_ctx.
820 * If @start_ctx is null, we capture the current context.
823 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
825 MonoContext extra_ctx;
826 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
827 MONO_ARCH_CONTEXT_DEF
829 if (!thread || !thread->jit_data)
833 mono_arch_flush_register_windows ();
835 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
836 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
838 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
840 start_ctx = &extra_ctx;
843 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
847 * mono_walk_stack_with_state:
849 * Unwind a thread described by @state.
851 * State must be valid (state->valid == TRUE).
853 * If you are using this function to unwind another thread, make sure it is suspended.
855 * If @state is null, we capture the current context.
858 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
860 MonoThreadUnwindState extra_state;
862 g_assert (!mono_thread_info_is_async_context ());
863 if (!mono_thread_state_init_from_current (&extra_state))
865 state = &extra_state;
868 g_assert (state->valid);
870 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
874 mono_walk_stack_full (func,
876 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
877 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
878 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
879 unwind_options, user_data);
883 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
885 MonoThreadUnwindState state;
886 if (!mono_thread_state_init_from_current (&state))
888 mono_walk_stack_with_state (func, &state, options, user_data);
892 * mono_walk_stack_full:
893 * @func: callback to call for each stack frame
894 * @domain: starting appdomain, can be NULL to use the current domain
895 * @unwind_options: what extra information the unwinder should gather
896 * @start_ctx: starting state of the stack walk, can be NULL.
897 * @thread: the thread whose stack to walk, can be NULL to use the current thread
898 * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread
899 * @user_data: data passed to the callback
901 * This function walks the stack of a thread, starting from the state
902 * represented by start_ctx. For each frame the callback
903 * function is called with the relevant info. The walk ends when no more
904 * managed stack frames are found or when the callback returns a TRUE value.
907 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
910 MonoContext ctx, new_ctx;
911 StackFrameInfo frame;
913 mgreg_t *reg_locations [MONO_MAX_IREGS];
914 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
915 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
916 gboolean async = mono_thread_info_is_async_context ();
918 if (mono_llvm_only) {
924 ips = get_unwind_backtrace ();
925 for (l = ips; l; l = l->next) {
926 guint8 *ip = (guint8*)l->data;
927 memset (&frame, 0, sizeof (StackFrameInfo));
928 frame.ji = mini_jit_info_table_find (domain, (char*)ip, &frame.domain);
929 if (!frame.ji || frame.ji->is_trampoline)
931 frame.type = FRAME_TYPE_MANAGED;
932 frame.method = jinfo_get_method (frame.ji);
933 // FIXME: Cannot lookup the actual method
934 frame.actual_method = frame.method;
935 if (frame.type == FRAME_TYPE_MANAGED) {
936 if (!frame.method->wrapper_type || frame.method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
937 frame.managed = TRUE;
939 frame.native_offset = ip - (guint8*)frame.ji->code_start;
940 frame.il_offset = -1;
942 if (func (&frame, NULL, user_data))
949 g_assert (start_ctx);
952 /*The LMF will be null if the target have no managed frames.*/
953 /* g_assert (lmf); */
956 g_assert (unwind_options == MONO_UNWIND_NONE);
958 memcpy (&ctx, start_ctx, sizeof (MonoContext));
959 memset (reg_locations, 0, sizeof (reg_locations));
961 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
963 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
967 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
968 MonoDebugSourceLocation *source;
970 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
972 il_offset = source->il_offset;
975 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
976 il_offset = sp.il_offset;
980 mono_debug_free_source_location (source);
984 frame.il_offset = il_offset;
986 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
987 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
989 frame.actual_method = frame.method;
992 if (get_reg_locations)
993 frame.reg_locations = reg_locations;
995 if (func (&frame, &ctx, user_data))
998 if (get_reg_locations) {
999 for (i = 0; i < MONO_MAX_IREGS; ++i)
1000 if (new_reg_locations [i])
1001 reg_locations [i] = new_reg_locations [i];
1009 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
1010 MonoReflectionMethod **method,
1011 gint32 *iloffset, gint32 *native_offset,
1012 MonoString **file, gint32 *line, gint32 *column)
1015 MonoDomain *domain = mono_domain_get ();
1016 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1017 MonoLMF *lmf = mono_get_lmf ();
1018 MonoJitInfo *ji = NULL;
1019 MonoContext ctx, new_ctx;
1020 MonoDebugSourceLocation *location;
1021 MonoMethod *jmethod = NULL, *actual_method;
1022 StackFrameInfo frame;
1025 MONO_ARCH_CONTEXT_DEF;
1027 if (mono_llvm_only) {
1029 MonoDomain *frame_domain;
1030 guint8 *frame_ip = NULL;
1032 /* FIXME: Generalize this code with an interface which returns an array of StackFrame structures */
1034 ips = get_unwind_backtrace ();
1035 for (l = ips; l && skip >= 0; l = l->next) {
1036 guint8 *ip = (guint8*)l->data;
1040 ji = mini_jit_info_table_find (mono_domain_get (), (char*)ip, &frame_domain);
1041 if (!ji || ji->is_trampoline)
1044 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1045 jmethod = jinfo_get_method (ji);
1046 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1053 /* No way to resolve generic instances */
1054 actual_method = jmethod;
1055 *native_offset = frame_ip - (guint8*)ji->code_start;
1057 mono_arch_flush_register_windows ();
1059 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1060 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1062 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
1068 res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1072 if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1073 frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1074 frame.type == FRAME_TYPE_TRAMPOLINE)
1078 *native_offset = frame.native_offset;
1080 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1081 jmethod = jinfo_get_method (ji);
1082 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1085 } while (skip >= 0);
1087 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
1090 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, actual_method, NULL, &error);
1091 if (!mono_error_ok (&error)) {
1092 mono_error_set_pending_exception (&error);
1095 mono_gc_wbarrier_generic_store (method, (MonoObject*) rm);
1097 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
1099 *iloffset = location->il_offset;
1103 if (need_file_info) {
1105 mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file));
1106 *line = location->row;
1107 *column = location->column;
1110 *line = *column = 0;
1114 mono_debug_free_source_location (location);
1120 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1123 MonoClass *catch_class = ei->data.catch_class;
1124 MonoType *inflated_type;
1125 MonoGenericContext context;
1127 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1128 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1131 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1133 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1135 /* FIXME: we shouldn't inflate but instead put the
1136 type in the rgctx and fetch it from there. It
1137 might be a good idea to do this lazily, i.e. only
1138 when the exception is actually thrown, so as not to
1139 waste space for exception clauses which might never
1141 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
1142 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1144 catch_class = mono_class_from_mono_type (inflated_type);
1145 mono_metadata_free_type (inflated_type);
1151 * mini_jit_info_table_find_ext:
1153 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1154 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1155 * OUT_DOMAIN if it is not NULL.
1158 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1161 MonoInternalThread *t = mono_thread_internal_current ();
1167 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1170 *out_domain = domain;
1174 /* maybe it is shared code, so we also search in the root domain */
1175 if (domain != mono_get_root_domain ()) {
1176 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1179 *out_domain = mono_get_root_domain ();
1187 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1188 for (; refs && *refs; refs++) {
1189 if (*refs != domain && *refs != mono_get_root_domain ()) {
1190 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1193 *out_domain = (MonoDomain*) *refs;
1203 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1205 return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
1208 /* Class lazy loading functions */
1209 static GENERATE_GET_CLASS_WITH_CACHE (runtime_compat_attr, System.Runtime.CompilerServices, RuntimeCompatibilityAttribute)
1212 * wrap_non_exception_throws:
1214 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1215 * WrapNonExceptionThrows flag set.
1218 wrap_non_exception_throws (MonoMethod *m)
1221 MonoAssembly *ass = m->klass->image->assembly;
1222 MonoCustomAttrInfo* attrs;
1225 gboolean val = FALSE;
1228 if (ass->wrap_non_exception_throws_inited)
1229 return ass->wrap_non_exception_throws;
1231 klass = mono_class_get_runtime_compat_attr_class ();
1233 attrs = mono_custom_attrs_from_assembly_checked (ass, &error);
1234 mono_error_cleanup (&error); /* FIXME don't swallow the error */
1236 for (i = 0; i < attrs->num_attrs; ++i) {
1237 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1239 int num_named, named_type, name_len;
1242 if (!attr->ctor || attr->ctor->klass != klass)
1244 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1245 p = (const char*)attr->data;
1246 g_assert (read16 (p) == 0x0001);
1248 num_named = read16 (p);
1254 /* data_type = *p; */
1257 if (named_type != 0x54)
1259 name_len = mono_metadata_decode_blob_size (p, &p);
1260 name = (char *)g_malloc (name_len + 1);
1261 memcpy (name, p, name_len);
1262 name [name_len] = 0;
1264 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1266 /* The value is a BOOLEAN */
1269 mono_custom_attrs_free (attrs);
1272 ass->wrap_non_exception_throws = val;
1273 mono_memory_barrier ();
1274 ass->wrap_non_exception_throws_inited = TRUE;
1279 #ifndef MONO_ARCH_STACK_GROWS_UP
1280 #define DOES_STACK_GROWS_UP 1
1282 #define DOES_STACK_GROWS_UP 0
1285 #define MAX_UNMANAGED_BACKTRACE 128
1287 build_native_trace (MonoError *error)
1289 mono_error_init (error);
1290 /* This puppy only makes sense on mobile, IOW, ARM. */
1291 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1293 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1294 int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1299 res = mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, size, error);
1300 return_val_if_nok (error, NULL);
1302 for (i = 0; i < size; i++)
1303 mono_array_set (res, gpointer, i, native_trace [i]);
1311 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, MonoArray *initial_trace_ips, GList **trace_ips)
1313 if (mono_ex && !initial_trace_ips) {
1314 *trace_ips = g_list_reverse (*trace_ips);
1316 MonoArray *ips_arr = mono_glist_to_array (*trace_ips, mono_defaults.int_class, &error);
1317 mono_error_assert_ok (&error);
1318 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
1319 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace (&error));
1320 mono_error_assert_ok (&error);
1321 if (dynamic_methods) {
1322 /* These methods could go away anytime, so save a reference to them in the exception object */
1324 MonoMList *list = NULL;
1326 for (l = dynamic_methods; l; l = l->next) {
1328 MonoDomain *domain = mono_domain_get ();
1330 if (domain->method_to_dyn_method) {
1331 mono_domain_lock (domain);
1332 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1333 mono_domain_unlock (domain);
1335 MonoObject *o = mono_gchandle_get_target (dis_link);
1337 list = mono_mlist_prepend_checked (list, o, &error);
1338 mono_error_assert_ok (&error);
1344 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1347 g_list_free (*trace_ips);
1352 * mono_handle_exception_internal_first_pass:
1354 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1355 * OBJ is found. Run the index of the filter clause which caught the exception into
1356 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1359 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1362 MonoDomain *domain = mono_domain_get ();
1363 MonoJitInfo *ji = NULL;
1364 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1365 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1366 MonoLMF *lmf = mono_get_lmf ();
1367 MonoArray *initial_trace_ips = NULL;
1368 GList *trace_ips = NULL;
1369 GSList *dynamic_methods = NULL;
1370 MonoException *mono_ex;
1371 gboolean stack_overflow = FALSE;
1372 MonoContext initial_ctx;
1374 int frame_count = 0;
1379 g_assert (ctx != NULL);
1381 if (obj == (MonoObject *)domain->stack_overflow_ex)
1382 stack_overflow = TRUE;
1384 mono_ex = (MonoException*)obj;
1385 initial_trace_ips = mono_ex->trace_ips;
1387 if (mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1388 mono_ex = (MonoException*)obj;
1389 initial_trace_ips = mono_ex->trace_ips;
1391 mono_error_assert_ok (&error);
1396 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1398 g_assert (jit_tls->end_of_stack);
1399 g_assert (jit_tls->abort_func);
1402 *out_filter_idx = -1;
1406 *out_prev_ji = NULL;
1411 MonoContext new_ctx;
1413 int clause_index_start = 0;
1414 gboolean unwind_res = TRUE;
1416 StackFrameInfo frame;
1421 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1423 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1424 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1425 frame.type == FRAME_TYPE_TRAMPOLINE) {
1429 g_assert (frame.type == FRAME_TYPE_MANAGED);
1434 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1435 g_slist_free (dynamic_methods);
1440 method = jinfo_get_method (ji);
1441 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1443 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1444 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1445 "The native frame called the managed method:\n%s\n",
1446 mono_method_full_name (method, TRUE));
1449 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1451 * Avoid overwriting the stack trace if the exception is
1452 * rethrown. Also avoid giant stack traces during a stack
1455 if (!initial_trace_ips && (frame_count < 1000)) {
1456 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1457 trace_ips = g_list_prepend (trace_ips,
1458 get_generic_info_from_stack_frame (ji, ctx));
1462 if (method->dynamic)
1463 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1465 if (stack_overflow) {
1466 if (DOES_STACK_GROWS_UP)
1467 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1469 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1471 free_stack = 0xffffff;
1474 for (i = clause_index_start; i < ji->num_clauses; i++) {
1475 MonoJitExceptionInfo *ei = &ji->clauses [i];
1476 gboolean filtered = FALSE;
1479 * During stack overflow, wait till the unwinding frees some stack
1480 * space before running handlers/finalizers.
1482 if (free_stack <= (64 * 1024))
1485 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1487 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1490 * Have to unwrap RuntimeWrappedExceptions if the
1491 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1493 if (non_exception && !wrap_non_exception_throws (method))
1494 ex_obj = non_exception;
1498 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1499 gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD;
1500 #ifndef DISABLE_PERFCOUNTERS
1501 mono_perfcounters->exceptions_filters++;
1504 Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to
1505 trim the stackframe since if it returns FALSE we lose information.
1507 FIXME Not 100% sure if it's a good idea even with user clauses.
1510 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1512 #ifndef MONO_CROSS_COMPILE
1513 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1515 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1517 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1518 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1520 g_assert (!ji->from_llvm);
1521 /* store the exception object in bp + ei->exvar_offset */
1522 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1526 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1528 * Pass the original il clause index to the landing pad so it can
1529 * branch to the landing pad associated with the il clause.
1530 * This is needed because llvm compiled code assumes that the EH
1531 * code always branches to the innermost landing pad.
1534 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1537 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1538 filtered = call_filter (ctx, ei->data.filter);
1539 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1540 if (filtered && out_filter_idx)
1541 *out_filter_idx = filter_idx;
1548 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1549 g_slist_free (dynamic_methods);
1550 /* mono_debugger_agent_handle_exception () needs this */
1551 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1556 MonoError isinst_error;
1557 mono_error_init (&isinst_error);
1558 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (ex_obj, catch_class, &error)) {
1559 setup_stack_trace (mono_ex, dynamic_methods, initial_trace_ips, &trace_ips);
1560 g_slist_free (dynamic_methods);
1565 /* mono_debugger_agent_handle_exception () needs this */
1566 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1569 mono_error_cleanup (&isinst_error);
1576 g_assert_not_reached ();
1580 * mono_handle_exception_internal:
1581 * @ctx: saved processor state
1582 * @obj: the exception object
1583 * @resume: whenever to resume unwinding based on the state in MonoJitTlsData.
1586 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1589 MonoDomain *domain = mono_domain_get ();
1590 MonoJitInfo *ji, *prev_ji;
1591 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1592 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1593 MonoLMF *lmf = mono_get_lmf ();
1594 MonoException *mono_ex;
1595 gboolean stack_overflow = FALSE;
1596 MonoContext initial_ctx;
1598 int frame_count = 0;
1599 gint32 filter_idx, first_filter_idx = 0;
1602 MonoObject *non_exception = NULL;
1604 g_assert (ctx != NULL);
1606 MonoException *ex = mono_get_exception_null_reference ();
1607 MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object"));
1608 obj = (MonoObject *)ex;
1612 * Allocate a new exception object instead of the preconstructed ones.
1614 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1616 * It is not a good idea to try and put even more pressure on the little stack available.
1617 * obj = mono_get_exception_stack_overflow ();
1619 stack_overflow = TRUE;
1621 else if (obj == (MonoObject *)domain->null_reference_ex) {
1622 obj = (MonoObject *)mono_get_exception_null_reference ();
1625 if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1626 mono_error_assert_ok (&error);
1627 non_exception = obj;
1628 obj = (MonoObject *)mono_get_exception_runtime_wrapped_checked (obj, &error);
1629 mono_error_assert_ok (&error);
1632 mono_ex = (MonoException*)obj;
1634 if (mini_get_debug_options ()->suspend_on_exception) {
1635 mono_runtime_printf_err ("Exception thrown, suspending...");
1640 if (mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1641 mono_ex = (MonoException*)obj;
1643 mono_error_assert_ok (&error);
1647 if (mono_ex && jit_tls->class_cast_from) {
1648 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1649 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1650 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1651 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1652 mono_ex->message = mono_string_new (domain, msg);
1657 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1658 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1659 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1660 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1661 mono_ex->message = mono_string_new (domain, msg);
1669 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1671 g_assert (jit_tls->end_of_stack);
1672 g_assert (jit_tls->abort_func);
1675 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1676 * end up being TRUE on any code path.
1678 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1683 MonoContext ctx_cp = *ctx;
1684 if (mono_trace_is_enabled ()) {
1685 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1686 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1687 MonoObject *message;
1688 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1690 if (get_message == NULL) {
1692 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1694 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1696 MonoObject *exc = NULL;
1697 message = mono_runtime_try_invoke (get_message, obj, NULL, &exc, &error);
1698 g_assert (exc == NULL);
1699 mono_error_assert_ok (&error);
1703 msg = mono_string_to_utf8_checked ((MonoString *) message, &error);
1704 if (!is_ok (&error)) {
1705 mono_error_cleanup (&error);
1706 msg = g_strdup ("(error while display System.Exception.Message property)");
1709 msg = g_strdup ("(System.Exception.Message property not available)");
1712 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);
1714 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1715 mono_print_thread_dump_from_ctx (ctx);
1717 jit_tls->orig_ex_ctx_set = TRUE;
1718 mono_profiler_exception_thrown (obj);
1719 jit_tls->orig_ex_ctx_set = FALSE;
1721 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1724 if (mini_get_debug_options ()->break_on_exc)
1726 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1728 if (mini_get_debug_options ()->suspend_on_unhandled) {
1729 mono_runtime_printf_err ("Unhandled exception, suspending...");
1734 // FIXME: This runs managed code so it might cause another stack overflow when
1735 // we are handling a stack overflow
1736 mono_unhandled_exception (obj);
1738 gboolean unhandled = FALSE;
1741 * The exceptions caught by the mono_runtime_invoke_checked () calls
1742 * in the threadpool needs to be treated as unhandled (#669836).
1744 * FIXME: The check below is hackish, but its hard to distinguish
1745 * these runtime invoke calls from others in the runtime.
1747 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1748 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1753 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1755 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1765 MonoContext new_ctx;
1767 int clause_index_start = 0;
1768 gboolean unwind_res = TRUE;
1772 ji = jit_tls->resume_state.ji;
1773 new_ctx = jit_tls->resume_state.new_ctx;
1774 clause_index_start = jit_tls->resume_state.clause_index;
1775 lmf = jit_tls->resume_state.lmf;
1776 first_filter_idx = jit_tls->resume_state.first_filter_idx;
1777 filter_idx = jit_tls->resume_state.filter_idx;
1779 StackFrameInfo frame;
1781 unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1783 if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE ||
1784 frame.type == FRAME_TYPE_MANAGED_TO_NATIVE ||
1785 frame.type == FRAME_TYPE_TRAMPOLINE) {
1789 g_assert (frame.type == FRAME_TYPE_MANAGED);
1795 *(mono_get_lmf_addr ()) = lmf;
1797 jit_tls->abort_func (obj);
1798 g_assert_not_reached ();
1801 method = jinfo_get_method (ji);
1803 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1805 if (stack_overflow) {
1806 if (DOES_STACK_GROWS_UP)
1807 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1809 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1811 free_stack = 0xffffff;
1814 for (i = clause_index_start; i < ji->num_clauses; i++) {
1815 MonoJitExceptionInfo *ei = &ji->clauses [i];
1816 gboolean filtered = FALSE;
1819 * During stack overflow, wait till the unwinding frees some stack
1820 * space before running handlers/finalizers.
1822 if (free_stack <= (64 * 1024))
1825 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) {
1827 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1830 * Have to unwrap RuntimeWrappedExceptions if the
1831 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1833 if (non_exception && !wrap_non_exception_throws (method))
1834 ex_obj = non_exception;
1838 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
1839 #ifndef MONO_CROSS_COMPILE
1840 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1841 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1843 g_assert (!ji->from_llvm);
1844 /* store the exception object in bp + ei->exvar_offset */
1845 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1850 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1852 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1855 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1857 * Filter clauses should only be run in the
1858 * first pass of exception handling.
1860 filtered = (filter_idx == first_filter_idx);
1864 mono_error_init (&error);
1865 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
1866 mono_object_isinst_checked (ex_obj, catch_class, &error)) || filtered) {
1868 * This guards against the situation that we abort a thread that is executing a finally clause
1869 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
1870 * check for this situation here and resume interruption if we are below the guarded block.
1872 if (G_UNLIKELY (jit_tls->handler_block_return_address)) {
1873 gboolean is_outside = FALSE;
1874 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
1875 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
1876 //FIXME make this stack direction aware
1877 if (catch_bp > prot_bp) {
1879 } else if (catch_bp == prot_bp) {
1880 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
1881 * So we check if the catch handler_start is protected by the guarded handler protected region
1884 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
1885 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
1886 * There aren't any further finally/fault handler blocks down the stack over this exception.
1887 * This must be ensured by the code that installs the guard trampoline.
1889 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
1891 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
1896 jit_tls->handler_block_return_address = NULL;
1897 jit_tls->handler_block = NULL;
1898 mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/
1902 if (mono_trace_is_enabled () && mono_trace_eval (method))
1903 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1904 jit_tls->orig_ex_ctx_set = TRUE;
1905 mono_profiler_exception_clause_handler (method, ei->flags, i);
1906 jit_tls->orig_ex_ctx_set = FALSE;
1907 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1909 #ifndef DISABLE_PERFCOUNTERS
1910 mono_perfcounters->exceptions_depth += frame_count;
1912 if (obj == (MonoObject *)domain->stack_overflow_ex)
1913 jit_tls->handling_stack_ovf = FALSE;
1917 mono_error_cleanup (&error);
1918 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
1919 if (mono_trace_is_enabled () && mono_trace_eval (method))
1920 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1921 jit_tls->orig_ex_ctx_set = TRUE;
1922 mono_profiler_exception_clause_handler (method, ei->flags, i);
1923 jit_tls->orig_ex_ctx_set = FALSE;
1924 call_filter (ctx, ei->handler_start);
1926 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
1927 if (mono_trace_is_enabled () && mono_trace_eval (method))
1928 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
1929 jit_tls->orig_ex_ctx_set = TRUE;
1930 mono_profiler_exception_clause_handler (method, ei->flags, i);
1931 jit_tls->orig_ex_ctx_set = FALSE;
1932 #ifndef DISABLE_PERFCOUNTERS
1933 mono_perfcounters->exceptions_finallys++;
1936 if (ji->from_llvm) {
1938 * LLVM compiled finally handlers follow the design
1939 * of the c++ ehabi, i.e. they call a resume function
1940 * at the end instead of returning to the caller.
1941 * So save the exception handling state,
1942 * mono_resume_unwind () will call us again to continue
1945 jit_tls->resume_state.ex_obj = obj;
1946 jit_tls->resume_state.ji = ji;
1947 jit_tls->resume_state.clause_index = i + 1;
1948 jit_tls->resume_state.ctx = *ctx;
1949 jit_tls->resume_state.new_ctx = new_ctx;
1950 jit_tls->resume_state.lmf = lmf;
1951 jit_tls->resume_state.first_filter_idx = first_filter_idx;
1952 jit_tls->resume_state.filter_idx = filter_idx;
1953 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1956 call_filter (ctx, ei->handler_start);
1962 jit_tls->orig_ex_ctx_set = TRUE;
1963 mono_profiler_exception_method_leave (method);
1964 jit_tls->orig_ex_ctx_set = FALSE;
1969 g_assert_not_reached ();
1973 * mono_debugger_run_finally:
1974 * @start_ctx: saved processor state
1976 * This method is called by the Mono Debugger to call all `finally' clauses of the
1977 * current stack frame. It's used when the user issues a `return' command to make
1978 * the current stack frame return. After returning from this method, the debugger
1979 * unwinds the stack one frame and gives control back to the user.
1981 * NOTE: This method is only used when running inside the Mono Debugger.
1984 mono_debugger_run_finally (MonoContext *start_ctx)
1986 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1987 MonoDomain *domain = mono_domain_get ();
1988 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
1989 MonoLMF *lmf = mono_get_lmf ();
1990 MonoContext ctx, new_ctx;
1991 MonoJitInfo *ji, rji;
1996 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
1997 if (!ji || ji == (gpointer)-1)
2001 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
2003 for (i = 0; i < ji->num_clauses; i++) {
2004 MonoJitExceptionInfo *ei = &ji->clauses [i];
2006 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
2007 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
2008 call_filter (&ctx, ei->handler_start);
2014 * mono_handle_exception:
2015 * @ctx: saved processor state
2016 * @obj: the exception object
2019 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
2021 MONO_REQ_GC_UNSAFE_MODE;
2023 #ifndef DISABLE_PERFCOUNTERS
2024 mono_perfcounters->exceptions_thrown++;
2027 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
2030 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2032 #ifndef MONO_ARCH_USE_SIGACTION
2033 #error "Can't use sigaltstack without sigaction"
2036 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
2039 mono_setup_altstack (MonoJitTlsData *tls)
2043 guint8 *staddr = NULL;
2045 if (mono_running_on_valgrind ())
2048 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2052 tls->end_of_stack = staddr + stsize;
2053 tls->stack_size = stsize;
2055 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
2057 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
2058 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
2060 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
2062 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
2063 /* mprotect can fail for the main thread stack */
2064 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);
2065 g_assert (gaddr == tls->stack_ovf_guard_base);
2066 tls->stack_ovf_valloced = TRUE;
2069 /* Setup an alternate signal stack */
2070 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON);
2071 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2073 g_assert (tls->signal_stack);
2075 sa.ss_sp = tls->signal_stack;
2076 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2078 g_assert (sigaltstack (&sa, NULL) == 0);
2080 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);
2084 mono_free_altstack (MonoJitTlsData *tls)
2089 sa.ss_sp = tls->signal_stack;
2090 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2091 sa.ss_flags = SS_DISABLE;
2092 err = sigaltstack (&sa, NULL);
2093 g_assert (err == 0);
2095 if (tls->signal_stack)
2096 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE);
2097 if (tls->stack_ovf_valloced)
2098 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size);
2100 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2103 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2106 mono_setup_altstack (MonoJitTlsData *tls)
2111 mono_free_altstack (MonoJitTlsData *tls)
2115 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2118 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2120 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2121 /* we need to leave some room for throwing the exception */
2122 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2123 unprotect_size -= mono_pagesize ();
2124 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2125 * is sufficient stack
2127 //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);
2129 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2130 return unprotect_size == jit_tls->stack_ovf_guard_size;
2133 static G_GNUC_UNUSED void
2134 try_more_restore (void)
2136 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2137 if (try_restore_stack_protection (jit_tls, 500))
2138 jit_tls->restore_stack_prot = NULL;
2141 static G_GNUC_UNUSED void
2142 restore_stack_protection (void)
2144 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2145 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2146 /* if we can't restore the stack protection, keep a callback installed so
2147 * we'll try to restore as much stack as we can at each return from unmanaged
2150 if (try_restore_stack_protection (jit_tls, 4096))
2151 jit_tls->restore_stack_prot = NULL;
2153 jit_tls->restore_stack_prot = try_more_restore_tramp;
2154 /* here we also throw a stack overflow exception */
2155 ex->trace_ips = NULL;
2156 ex->stack_trace = NULL;
2157 mono_raise_exception (ex);
2161 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2163 MONO_REQ_GC_UNSAFE_MODE;
2165 void (*func)(void) = (void (*)(void))tramp_data;
2171 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2176 /* we got a stack overflow in the soft-guard pages
2177 * There are two cases:
2178 * 1) managed code caused the overflow: we unprotect the soft-guard page
2179 * and let the arch-specific code trigger the exception handling mechanism
2180 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2181 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2182 * and hope we can continue with those enabled, at least until the hard-guard page
2183 * is hit. The alternative to continuing here is to just print a message and abort.
2184 * We may add in the future the code to protect the pages again in the codepath
2185 * when we return from unmanaged to managed code.
2187 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2188 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2189 /* we unprotect the minimum amount we can */
2191 gboolean handled = FALSE;
2193 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2194 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2195 guard_size -= mono_pagesize ();
2197 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2198 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2199 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);
2200 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2202 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2207 /* We print a message: after this even managed stack overflows
2208 * may crash the runtime
2210 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2211 if (!jit_tls->handling_stack_ovf) {
2212 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2213 jit_tls->handling_stack_ovf = 1;
2215 /*fprintf (stderr, "Already handling stack overflow\n");*/
2224 MonoMethod *omethod;
2226 } PrintOverflowUserData;
2228 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2230 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2232 MonoMethod *method = NULL;
2233 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2236 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2237 method = jinfo_get_method (frame->ji);
2240 if (user_data->count == 0) {
2241 /* The first frame is in its prolog, so a line number cannot be computed */
2242 user_data->count ++;
2246 /* If this is a one method overflow, skip the other instances */
2247 if (method == user_data->omethod)
2250 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2251 mono_runtime_printf_err (" %s", location);
2254 if (user_data->count == 1) {
2255 mono_runtime_printf_err (" <...>");
2256 user_data->omethod = method;
2258 user_data->omethod = NULL;
2261 user_data->count ++;
2263 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2270 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2272 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2273 PrintOverflowUserData ud;
2277 /* we don't do much now, but we can warn the user with a useful message */
2278 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2280 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2281 mono_sigctx_to_monoctx (ctx, &mctx);
2283 mono_runtime_printf_err ("Stacktrace:");
2285 memset (&ud, 0, sizeof (ud));
2287 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2289 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2290 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2292 mono_runtime_printf_err ("At <unmanaged>.");
2299 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2301 MonoMethod *method = NULL;
2303 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2304 method = jinfo_get_method (frame->ji);
2307 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2308 mono_runtime_printf_err (" %s", location);
2311 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2316 static G_GNUC_UNUSED gboolean
2317 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2319 GString *p = (GString*)data;
2320 MonoMethod *method = NULL;
2322 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2323 method = jinfo_get_method (frame->ji);
2325 if (method && frame->domain) {
2326 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2327 g_string_append_printf (p, " %s\n", location);
2330 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2335 #ifndef MONO_CROSS_COMPILE
2337 static gboolean handling_sigsegv = FALSE;
2340 * mono_handle_native_sigsegv:
2342 * Handle a SIGSEGV received while in native code by printing diagnostic
2343 * information and aborting.
2346 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2348 #ifdef MONO_ARCH_USE_SIGACTION
2349 struct sigaction sa;
2351 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2352 const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT";
2354 if (handling_sigsegv)
2357 if (mini_get_debug_options ()->suspend_on_sigsegv) {
2358 mono_runtime_printf_err ("Received SIGSEGV, suspending...");
2369 /* To prevent infinite loops when the stack walk causes a crash */
2370 handling_sigsegv = TRUE;
2372 /* !jit_tls means the thread was not registered with the runtime */
2373 if (jit_tls && mono_thread_internal_current ()) {
2374 mono_runtime_printf_err ("Stacktrace:\n");
2376 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2377 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2380 #ifdef HAVE_BACKTRACE_SYMBOLS
2386 mono_runtime_printf_err ("\nNative stacktrace:\n");
2388 size = backtrace (array, 256);
2389 names = backtrace_symbols (array, size);
2390 for (i =0; i < size; ++i) {
2391 mono_runtime_printf_err ("\t%s", names [i]);
2395 /* Try to get more meaningful information using gdb */
2397 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2398 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2399 /* From g_spawn_command_line_sync () in eglib */
2402 pid_t crashed_pid = getpid ();
2406 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2407 * it will deadlock. Call the syscall directly instead.
2409 pid = mono_runtime_syscall_fork ();
2410 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2412 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2413 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2414 // distributions set the scope to 1 which allows attaching only to direct children of
2415 // the current process
2416 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2420 dup2 (STDERR_FILENO, STDOUT_FILENO);
2422 mono_gdb_render_native_backtraces (crashed_pid);
2426 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2427 waitpid (pid, &status, 0);
2432 mono_exception_native_unwind (ctx, info);
2436 * A SIGSEGV indicates something went very wrong so we can no longer depend
2437 * on anything working. So try to print out lots of diagnostics, starting
2438 * with ones which have a greater chance of working.
2440 mono_runtime_printf_err (
2442 "=================================================================\n"
2443 "Got a %s while executing native code. This usually indicates\n"
2444 "a fatal error in the mono runtime or one of the native libraries \n"
2445 "used by your application.\n"
2446 "=================================================================\n",
2450 #ifdef MONO_ARCH_USE_SIGACTION
2452 /* Remove our SIGABRT handler */
2453 sa.sa_handler = SIG_DFL;
2454 sigemptyset (&sa.sa_mask);
2457 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2461 if (!mono_do_crash_chaining) {
2462 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2463 #if defined (PLATFORM_ANDROID)
2474 mono_handle_native_sigsegv (int signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2476 g_assert_not_reached ();
2479 #endif /* !MONO_CROSS_COMPILE */
2482 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2484 MonoInternalThread *thread = mono_thread_internal_current ();
2485 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2493 GError *error = NULL;
2498 text = g_string_new (0);
2500 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2502 g_string_append_printf (text, "\n\"%s\"", name);
2505 else if (thread->threadpool_thread)
2506 g_string_append (text, "\n\"<threadpool thread>\"");
2508 g_string_append (text, "\n\"<unnamed thread>\"");
2511 wapi_desc = wapi_current_thread_desc ();
2512 g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc);
2516 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2518 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2520 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2522 mono_sigctx_to_monoctx (sigctx, &ctx);
2524 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2526 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2529 mono_runtime_printf ("%s", text->str);
2531 #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG
2532 OutputDebugStringA(text->str);
2535 g_string_free (text, TRUE);
2536 mono_runtime_stdout_fflush ();
2540 * mono_print_thread_dump:
2542 * Print information about the current thread to stdout.
2543 * SIGCTX can be NULL, allowing this to be called from gdb.
2546 mono_print_thread_dump (void *sigctx)
2548 mono_print_thread_dump_internal (sigctx, NULL);
2552 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2554 mono_print_thread_dump_internal (NULL, ctx);
2558 * mono_resume_unwind:
2560 * This is called by a trampoline from LLVM compiled finally clauses to continue
2564 mono_resume_unwind (MonoContext *ctx)
2566 MONO_REQ_GC_UNSAFE_MODE;
2568 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2569 MonoContext new_ctx;
2571 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2572 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2575 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2577 mono_restore_context (&new_ctx);
2580 #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD
2585 MonoJitExceptionInfo *ei;
2586 } FindHandlerBlockData;
2589 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2593 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2594 MonoJitInfo *ji = frame->ji;
2599 ip = MONO_CONTEXT_GET_IP (ctx);
2601 for (i = 0; i < ji->num_clauses; ++i) {
2602 MonoJitExceptionInfo *ei = ji->clauses + i;
2603 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2605 /*If ip points to the first instruction it means the handler block didn't start
2606 so we can leave its execution to the EH machinery*/
2607 if (ei->handler_start < ip && ip < ei->data.handler_end) {
2619 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2622 MonoJitExceptionInfo *clause = NULL;
2625 ip = MONO_CONTEXT_GET_IP (ctx);
2627 for (i = 0; i < ji->num_clauses; ++i) {
2628 clause = &ji->clauses [i];
2629 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2631 if (clause->handler_start < ip && clause->data.handler_end > ip)
2635 /*no matching finally */
2636 if (i == ji->num_clauses)
2639 /*If we stopped on the instruction right before the try, we haven't actually started executing it*/
2640 if (ip == clause->handler_start)
2643 return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ());
2647 * Finds the bottom handler block running and install a block guard if needed.
2648 * FIXME add full-aot support.
2651 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2653 FindHandlerBlockData data = { 0 };
2654 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2661 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2662 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2664 if (!jit_tls || jit_tls->handler_block_return_address)
2667 /* Do an async safe stack walk */
2668 mono_thread_info_set_is_async_context (TRUE);
2669 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2670 mono_thread_info_set_is_async_context (FALSE);
2675 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2677 resume_ip = install_handler_block_guard (data.ji, &data.ctx);
2678 if (resume_ip == NULL)
2681 jit_tls->handler_block_return_address = resume_ip;
2682 jit_tls->handler_block = data.ei;
2689 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2697 mono_set_cast_details (MonoClass *from, MonoClass *to)
2699 MonoJitTlsData *jit_tls = NULL;
2701 if (mini_get_debug_options ()->better_cast_details) {
2702 jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2703 jit_tls->class_cast_from = from;
2704 jit_tls->class_cast_to = to;
2709 /*returns false if the thread is not attached*/
2711 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
2713 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2714 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2722 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
2724 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2725 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2726 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2729 mono_thread_state_init (ctx);
2732 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
2738 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
2744 mono_thread_state_init (MonoThreadUnwindState *ctx)
2746 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2748 #if defined(MONO_CROSS_COMPILE)
2749 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
2750 #elif MONO_ARCH_HAS_MONO_CONTEXT
2751 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
2753 g_error ("Use a null sigctx requires a working mono-context");
2756 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2757 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2758 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
2764 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
2766 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2773 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2774 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2775 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2780 /*returns false if the thread is not attached*/
2782 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
2784 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
2785 MONO_ARCH_CONTEXT_DEF
2787 mono_arch_flush_register_windows ();
2789 if (!thread || !thread->jit_data) {
2793 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
2794 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
2796 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
2799 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
2800 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
2801 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
2807 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
2809 mono_handle_exception (ctx, (MonoObject *)exc);
2810 mono_restore_context (ctx);
2813 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
2815 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
2817 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
2818 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_native_tls_get_value (mono_jit_tls_id);
2819 jit_tls->ex_ctx = *ctx;
2821 mono_arch_setup_async_callback (ctx, async_cb, user_data);
2823 g_error ("This target doesn't support mono_arch_setup_async_callback");
2828 mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data)
2830 unhandled_exception_hook = func;
2831 unhandled_exception_hook_data = user_data;
2835 mono_invoke_unhandled_exception_hook (MonoObject *exc)
2837 if (unhandled_exception_hook) {
2838 unhandled_exception_hook (exc, unhandled_exception_hook_data);
2840 MonoError inner_error;
2841 MonoObject *other = NULL;
2842 MonoString *str = mono_object_try_to_string (exc, &other, &inner_error);
2845 if (str && is_ok (&inner_error)) {
2846 msg = mono_string_to_utf8_checked (str, &inner_error);
2848 if (!is_ok (&inner_error)) {
2849 msg = g_strdup_printf ("Nested exception while formatting original exception");
2850 mono_error_cleanup (&inner_error);
2852 char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc);
2853 char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other);
2855 msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n",
2856 original_backtrace, nested_backtrace);
2858 g_free (original_backtrace);
2859 g_free (nested_backtrace);
2861 msg = g_strdup ("Nested exception trying to figure out what went wrong");
2863 mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg);
2865 #if defined(HOST_IOS)
2866 g_assertion_message ("Terminating runtime due to unhandled exception");
2868 exit (mono_environment_exitcode_get ());
2872 g_assert_not_reached ();
2876 * mono_restore_context:
2878 * Call the architecture specific restore context function.
2881 mono_restore_context (MonoContext *ctx)
2883 static void (*restore_context) (MonoContext *);
2885 if (!restore_context)
2886 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
2887 restore_context (ctx);
2888 g_assert_not_reached ();
2892 * mono_jinfo_get_unwind_info:
2894 * Return the unwind info for JI.
2897 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
2900 return mono_aot_get_unwind_info (ji, unwind_info_len);
2902 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
2906 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
2908 MonoArchEHJitInfo *info;
2910 info = mono_jit_info_get_arch_eh_info (ji);
2913 return info->epilog_size;
2917 * LLVM/Bitcode exception handling.
2921 throw_exception (MonoObject *ex, gboolean rethrow)
2923 MONO_REQ_GC_UNSAFE_MODE;
2926 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
2927 MonoException *mono_ex;
2929 if (!mono_object_isinst_checked (ex, mono_defaults.exception_class, &error)) {
2930 mono_error_assert_ok (&error);
2931 mono_ex = mono_get_exception_runtime_wrapped_checked (ex, &error);
2932 mono_error_assert_ok (&error);
2935 mono_ex = (MonoException*)ex;
2938 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
2941 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
2942 GList *l, *ips = NULL;
2945 _Unwind_Backtrace (build_stack_trace, &ips);
2946 /* The list contains ip-gshared info pairs */
2948 ips = g_list_reverse (ips);
2949 for (l = ips; l; l = l->next) {
2950 trace = g_list_append (trace, l->data);
2951 trace = g_list_append (trace, NULL);
2953 MonoArray *ips_arr = mono_glist_to_array (trace, mono_defaults.int_class, &error);
2954 mono_error_assert_ok (&error);
2955 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
2957 g_list_free (trace);
2961 mono_llvm_cpp_throw_exception ();
2965 mono_llvm_throw_exception (MonoObject *ex)
2967 throw_exception (ex, FALSE);
2971 mono_llvm_rethrow_exception (MonoObject *ex)
2973 throw_exception (ex, TRUE);
2977 mono_llvm_raise_exception (MonoException *e)
2979 mono_llvm_throw_exception ((MonoObject*)e);
2983 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
2985 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
2988 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
2990 mono_llvm_throw_exception ((MonoObject*)ex);
2994 * mono_llvm_resume_exception:
2996 * Resume exception propagation.
2999 mono_llvm_resume_exception (void)
3001 mono_llvm_cpp_throw_exception ();
3005 * mono_llvm_load_exception:
3007 * Return the currently thrown exception.
3010 mono_llvm_load_exception (void)
3013 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3015 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
3017 if (mono_ex->trace_ips) {
3018 GList *trace_ips = NULL;
3019 gpointer ip = __builtin_return_address (0);
3021 size_t upper = mono_array_length (mono_ex->trace_ips);
3023 for (int i = 0; i < upper; i+= 2) {
3024 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
3025 gpointer curr_info = mono_array_get (mono_ex->trace_ips, gpointer, i + 1);
3026 trace_ips = g_list_append (trace_ips, curr_ip);
3027 trace_ips = g_list_append (trace_ips, curr_info);
3033 // FIXME: Does this work correctly for rethrows?
3034 // We may be discarding useful information
3035 // when this gets GC'ed
3036 MonoArray *ips_arr = mono_glist_to_array (trace_ips, mono_defaults.int_class, &error);
3037 mono_error_assert_ok (&error);
3038 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
3039 g_list_free (trace_ips);
3042 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
3044 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, 0, &error));
3045 mono_error_assert_ok (&error);
3046 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new_checked (mono_domain_get (), mono_defaults.stack_frame_class, 0, &error));
3047 mono_error_assert_ok (&error);
3050 return &mono_ex->object;
3054 * mono_llvm_clear_exception:
3056 * Mark the currently thrown exception as handled.
3059 mono_llvm_clear_exception (void)
3061 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3062 mono_gchandle_free (jit_tls->thrown_exc);
3063 jit_tls->thrown_exc = 0;
3065 mono_memory_barrier ();
3069 * mono_llvm_match_exception:
3071 * Return the innermost clause containing REGION_START-REGION_END which can handle
3072 * the current exception.
3075 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
3078 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3082 g_assert (jit_tls->thrown_exc);
3083 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
3084 for (int i = 0; i < jinfo->num_clauses; i++) {
3085 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
3086 MonoClass *catch_class;
3088 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
3091 catch_class = ei->data.catch_class;
3092 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) {
3093 MonoGenericContext context;
3094 MonoType *inflated_type;
3096 g_assert (rgctx || this_obj);
3097 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
3098 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
3099 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
3101 catch_class = mono_class_from_mono_type (inflated_type);
3102 mono_metadata_free_type (inflated_type);
3105 // FIXME: Handle edge cases handled in get_exception_catch_class
3106 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (exc, catch_class, &error)) {
3107 index = ei->clause_index;
3110 mono_error_assert_ok (&error);
3112 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
3113 g_assert_not_reached ();
3122 mono_debug_personality (int a, _Unwind_Action b,
3123 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
3125 g_assert_not_reached ();
3129 mono_debug_personality (void);
3132 mono_debug_personality (void)
3134 g_assert_not_reached ();