3 * generic exception support
6 * Dietmar Maurer (dietmar@ximian.com)
7 * Mono Team (mono-list@lists.ximian.com)
9 * Copyright 2001-2003 Ximian, Inc.
10 * Copyright 2003-2008 Novell, Inc.
11 * Copyright 2011 Xamarin Inc (http://www.xamarin.com).
12 * Licensed under the MIT license. See LICENSE file in the project root for full license information.
23 #ifdef HAVE_EXECINFO_H
27 #ifdef HAVE_SYS_TYPES_H
28 #include <sys/types.h>
31 #ifdef HAVE_SYS_WAIT_H
39 #ifdef HAVE_SYS_SYSCALL_H
40 #include <sys/syscall.h>
43 #ifdef HAVE_SYS_PRCTL_H
44 #include <sys/prctl.h>
51 #include <mono/metadata/appdomain.h>
52 #include <mono/metadata/tabledefs.h>
53 #include <mono/metadata/threads.h>
54 #include <mono/metadata/threads-types.h>
55 #include <mono/metadata/debug-helpers.h>
56 #include <mono/metadata/exception.h>
57 #include <mono/metadata/exception-internals.h>
58 #include <mono/metadata/object-internals.h>
59 #include <mono/metadata/reflection-internals.h>
60 #include <mono/metadata/gc-internals.h>
61 #include <mono/metadata/debug-internals.h>
62 #include <mono/metadata/mono-debug.h>
63 #include <mono/metadata/profiler-private.h>
64 #include <mono/metadata/mono-endian.h>
65 #include <mono/metadata/environment.h>
66 #include <mono/metadata/mono-mlist.h>
67 #include <mono/utils/mono-mmap.h>
68 #include <mono/utils/mono-logger-internals.h>
69 #include <mono/utils/mono-error.h>
70 #include <mono/utils/mono-error-internals.h>
74 #include "debugger-agent.h"
75 #include "seq-points.h"
76 #include "llvm-runtime.h"
77 #include "mini-llvm.h"
78 #include "interp/interp.h"
81 #include "mini-llvm-cpp.h"
88 #ifndef MONO_ARCH_CONTEXT_DEF
89 #define MONO_ARCH_CONTEXT_DEF
92 #ifndef MONO_ARCH_STACK_GROWS_UP
93 #define MONO_ARCH_STACK_GROWS_UP 0
97 * Raw frame information is stored in MonoException.trace_ips as an IntPtr[].
98 * This structure represents one entry.
99 * This should consists of pointers only.
104 gpointer generic_info;
107 /* Number of words in trace_ips belonging to one entry */
108 #define TRACE_IP_ENTRY_SIZE (sizeof (ExceptionTraceIp) / sizeof (gpointer))
110 static gpointer restore_context_func, call_filter_func;
111 static gpointer throw_exception_func, rethrow_exception_func;
112 static gpointer throw_corlib_exception_func;
114 static gpointer try_more_restore_tramp = NULL;
115 static gpointer restore_stack_protection_tramp = NULL;
117 static void try_more_restore (void);
118 static void restore_stack_protection (void);
119 static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data);
120 static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx);
121 static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data);
122 static gboolean mono_current_thread_has_handle_block_guard (void);
123 static gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx);
126 first_managed (MonoStackFrameInfo *frame, MonoContext *ctx, gpointer addr)
128 gpointer **data = (gpointer **)addr;
134 // FIXME: Happens with llvm_only
139 *data = MONO_CONTEXT_GET_SP (ctx);
145 mono_thread_get_managed_sp (void)
147 gpointer addr = NULL;
148 mono_walk_stack (first_managed, MONO_UNWIND_SIGNAL_SAFE, &addr);
153 mini_abort_threshold_offset (gpointer threshold, gpointer sp)
155 intptr_t stack_threshold = (intptr_t) threshold;
156 intptr_t stack_pointer = (intptr_t) sp;
158 const int direction = MONO_ARCH_STACK_GROWS_UP ? -1 : 1;
159 intptr_t magnitude = stack_pointer - stack_threshold;
161 return direction * magnitude;
165 mini_clear_abort_threshold (void)
167 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
168 jit_tls->abort_exc_stack_threshold = NULL;
172 mini_set_abort_threshold (MonoContext *ctx)
174 gpointer sp = MONO_CONTEXT_GET_SP (ctx);
175 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
176 // Only move it up, to avoid thrown/caught
177 // exceptions lower in the stack from triggering
179 gboolean above_threshold = mini_abort_threshold_offset (jit_tls->abort_exc_stack_threshold, sp) >= 0;
180 if (!jit_tls->abort_exc_stack_threshold || above_threshold) {
181 jit_tls->abort_exc_stack_threshold = sp;
185 // Note: In the case that the frame is above where the thread abort
186 // was set we bump the threshold so that functions called from the new,
187 // higher threshold don't trigger the thread abort exception
188 static inline gboolean
189 mini_above_abort_threshold (void)
191 gpointer sp = mono_thread_get_managed_sp ();
192 MonoJitTlsData *jit_tls = (MonoJitTlsData*) mono_tls_get_jit_tls ();
197 gboolean above_threshold = mini_abort_threshold_offset (jit_tls->abort_exc_stack_threshold, sp) >= 0;
200 jit_tls->abort_exc_stack_threshold = sp;
202 return above_threshold;
206 mono_get_seq_point_for_native_offset (MonoDomain *domain, MonoMethod *method, gint32 native_offset)
209 if (mono_find_prev_seq_point_for_native_offset (domain, method, native_offset, NULL, &sp))
215 mono_exceptions_init (void)
217 MonoRuntimeExceptionHandlingCallbacks cbs;
219 restore_context_func = mono_aot_get_trampoline ("restore_context");
220 call_filter_func = mono_aot_get_trampoline ("call_filter");
221 throw_exception_func = mono_aot_get_trampoline ("throw_exception");
222 rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception");
226 restore_context_func = mono_arch_get_restore_context (&info, FALSE);
227 mono_tramp_info_register (info, NULL);
228 call_filter_func = mono_arch_get_call_filter (&info, FALSE);
229 mono_tramp_info_register (info, NULL);
230 throw_exception_func = mono_arch_get_throw_exception (&info, FALSE);
231 mono_tramp_info_register (info, NULL);
232 rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE);
233 mono_tramp_info_register (info, NULL);
235 #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT
236 if (!mono_llvm_only) {
237 try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
238 restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL);
242 #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT
243 mono_arch_exceptions_init ();
245 #ifdef ENABLE_INTERPRETER
246 if (mono_use_interpreter)
247 cbs.mono_walk_stack_with_ctx = interp_walk_stack_with_ctx;
250 cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx;
252 cbs.mono_walk_stack_with_state = mono_walk_stack_with_state;
254 if (mono_llvm_only) {
255 cbs.mono_raise_exception = mono_llvm_raise_exception;
256 cbs.mono_reraise_exception = mono_llvm_reraise_exception;
258 cbs.mono_raise_exception = (void (*)(MonoException *))mono_get_throw_exception ();
259 cbs.mono_reraise_exception = (void (*)(MonoException *))mono_get_rethrow_exception ();
261 cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx;
262 cbs.mono_exception_walk_trace = mono_exception_walk_trace;
263 cbs.mono_install_handler_block_guard = mono_install_handler_block_guard;
264 cbs.mono_current_thread_has_handle_block_guard = mono_current_thread_has_handle_block_guard;
265 cbs.mono_clear_abort_threshold = mini_clear_abort_threshold;
266 cbs.mono_above_abort_threshold = mini_above_abort_threshold;
267 mono_install_eh_callbacks (&cbs);
268 mono_install_get_seq_point (mono_get_seq_point_for_native_offset);
272 mono_get_throw_exception (void)
274 g_assert (throw_exception_func);
275 return throw_exception_func;
279 mono_get_rethrow_exception (void)
281 g_assert (rethrow_exception_func);
282 return rethrow_exception_func;
286 mono_get_call_filter (void)
288 g_assert (call_filter_func);
289 return call_filter_func;
293 mono_get_restore_context (void)
295 g_assert (restore_context_func);
296 return restore_context_func;
300 mono_get_throw_corlib_exception (void)
302 gpointer code = NULL;
305 /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */
306 if (throw_corlib_exception_func)
307 return throw_corlib_exception_func;
310 code = mono_aot_get_trampoline ("throw_corlib_exception");
312 code = mono_arch_get_throw_corlib_exception (&info, FALSE);
313 mono_tramp_info_register (info, NULL);
316 mono_memory_barrier ();
318 throw_corlib_exception_func = code;
320 return throw_corlib_exception_func;
324 * mono_get_throw_exception_addr:
326 * Return an address which stores the result of
327 * mono_get_throw_exception.
330 mono_get_throw_exception_addr (void)
332 return &throw_exception_func;
336 is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip)
338 MonoTryBlockHoleTableJitInfo *table;
343 if (ei->try_start > ip || ip >= ei->try_end)
346 if (!ji->has_try_block_holes)
349 table = mono_jit_info_get_try_block_hole_table_info (ji);
350 offset = (guint32)((char*)ip - (char*)ji->code_start);
351 clause = (guint16)(ei - ji->clauses);
352 g_assert (clause < ji->num_clauses);
354 for (i = 0; i < table->num_holes; ++i) {
355 MonoTryBlockHoleJitInfo *hole = &table->holes [i];
356 if (ji->clauses [hole->clause].try_offset == ji->clauses [clause].try_offset && hole->offset <= offset && hole->offset + hole->length > offset)
362 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
365 static gboolean show_native_addresses = TRUE;
367 static gboolean show_native_addresses = FALSE;
370 static _Unwind_Reason_Code
371 build_stack_trace (struct _Unwind_Context *frame_ctx, void *state)
373 MonoDomain *domain = mono_domain_get ();
374 uintptr_t ip = _Unwind_GetIP (frame_ctx);
376 if (show_native_addresses || mono_jit_info_table_find (domain, (char*)ip)) {
377 GList **trace_ips = (GList **)state;
378 *trace_ips = g_list_prepend (*trace_ips, (gpointer)ip);
381 return _URC_NO_REASON;
385 get_unwind_backtrace (void)
389 _Unwind_Backtrace (build_stack_trace, &ips);
391 return g_slist_reverse (ips);
397 get_unwind_backtrace (void)
407 * Translate between the mono_arch_unwind_frame function and the old API.
410 find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
411 MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed)
413 StackFrameInfo frame;
416 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
418 /* Avoid costly table lookup during stack overflow */
419 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
422 ji = mini_jit_info_table_find (domain, (char *)ip, NULL);
427 err = mono_arch_unwind_frame (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame);
429 return (MonoJitInfo *)-1;
431 if (*lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
433 * Remove any unused lmf.
434 * Mask out the lower bits which might be used to hold additional information.
436 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
439 /* Convert between the new and the old APIs */
440 switch (frame.type) {
441 case FRAME_TYPE_MANAGED:
445 case FRAME_TYPE_TRAMPOLINE:
447 case FRAME_TYPE_MANAGED_TO_NATIVE:
451 memset (res, 0, sizeof (MonoJitInfo));
452 res->d.method = frame.method;
455 case FRAME_TYPE_DEBUGGER_INVOKE: {
459 * The normal exception handling code can't handle this frame, so just
462 ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed);
463 memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext));
467 g_assert_not_reached ();
472 /* mono_find_jit_info:
474 * This function is used to gather information from @ctx. It return the
475 * MonoJitInfo of the corresponding function, unwinds one stack frame and
476 * stores the resulting context into @new_ctx. It also stores a string
477 * describing the stack location into @trace (if not NULL), and modifies
478 * the @lmf if necessary. @native_offset return the IP offset from the
479 * start of the function or -1 if that info is not available.
482 mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx,
483 MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset,
487 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
489 MonoMethod *method = NULL;
500 ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2);
502 if (ji == (gpointer)-1)
505 if (ji && !ji->is_trampoline)
506 method = jinfo_get_method (ji);
508 if (managed2 || (method && method->wrapper_type)) {
509 const char *real_ip, *start;
512 start = (const char *)ji->code_start;
514 /* ctx->ip points into native code */
515 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
517 real_ip = (const char*)ip;
519 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
520 offset = real_ip - start;
525 *native_offset = offset;
528 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
532 *trace = mono_debug_print_stack_frame (method, offset, domain);
535 char *fname = mono_method_full_name (jinfo_get_method (res), TRUE);
536 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
545 * mono_find_jit_info_ext:
547 * A version of mono_find_jit_info which returns all data in the StackFrameInfo
549 * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE:
550 * - These frames are used to mark managed-to-native transitions, so CTX will refer to native
551 * code, and new_ctx will refer to the last managed frame. The caller should unwind once more
552 * to obtain the last managed frame.
553 * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS.
554 * On return, it will be filled with the locations where callee saved registers are saved
555 * by the current frame. This is returned outside of StackFrameInfo because it can be
556 * quite large on some platforms.
557 * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will
561 mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls,
562 MonoJitInfo *prev_ji, MonoContext *ctx,
563 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
564 mgreg_t **save_locations,
565 StackFrameInfo *frame)
568 gpointer ip = MONO_CONTEXT_GET_IP (ctx);
570 MonoDomain *target_domain = domain;
571 MonoMethod *method = NULL;
572 gboolean async = mono_thread_info_is_async_context ();
577 /* Avoid costly table lookup during stack overflow */
578 if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size)))
581 ji = mini_jit_info_table_find (domain, (char *)ip, &target_domain);
584 target_domain = domain;
587 memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*));
589 err = mono_arch_unwind_frame (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame);
593 if (frame->type != FRAME_TYPE_INTERP_TO_MANAGED && *lmf && ((*lmf) != jit_tls->first_lmf) && ((gpointer)MONO_CONTEXT_GET_SP (new_ctx) >= (gpointer)(*lmf))) {
595 * Remove any unused lmf.
596 * Mask out the lower bits which might be used to hold additional information.
598 *lmf = (MonoLMF *)(((gsize)(*lmf)->previous_lmf) & ~(SIZEOF_VOID_P -1));
601 if (frame->ji && !frame->ji->is_trampoline && !frame->ji->async)
602 method = jinfo_get_method (frame->ji);
604 if (frame->type == FRAME_TYPE_MANAGED && method) {
605 if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
606 frame->managed = TRUE;
609 if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) {
611 * This type of frame is just a marker, the caller should unwind once more to get the
612 * last managed frame.
615 frame->method = NULL;
618 frame->native_offset = -1;
619 frame->domain = target_domain;
620 frame->async_context = async;
624 if (frame->type == FRAME_TYPE_MANAGED)
625 frame->method = method;
627 if (ji && (frame->managed || (method && method->wrapper_type))) {
628 const char *real_ip, *start;
630 start = (const char *)ji->code_start;
631 if (frame->type == FRAME_TYPE_MANAGED)
632 real_ip = (const char*)ip;
634 /* ctx->ip points into native code */
635 real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx);
637 if ((real_ip >= start) && (real_ip <= start + ji->code_size))
638 frame->native_offset = real_ip - start;
640 frame->native_offset = -1;
644 *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain);
646 if (trace && frame->method) {
647 char *fname = mono_method_full_name (frame->method, TRUE);
648 *trace = g_strdup_printf ("in (unmanaged) %s", fname);
658 MonoInterpStackIter interp_iter;
662 unwinder_init (Unwinder *unwinder)
664 memset (unwinder, 0, sizeof (Unwinder));
667 #if defined(__GNUC__) && defined(TARGET_ARM64)
668 /* gcc 4.9.2 seems to miscompile this on arm64 */
669 static __attribute__((optimize("O0"))) gboolean
673 unwinder_unwind_frame (Unwinder *unwinder,
674 MonoDomain *domain, MonoJitTlsData *jit_tls,
675 MonoJitInfo *prev_ji, MonoContext *ctx,
676 MonoContext *new_ctx, char **trace, MonoLMF **lmf,
677 mgreg_t **save_locations,
678 StackFrameInfo *frame)
680 if (unwinder->in_interp) {
681 unwinder->in_interp = mono_interp_frame_iter_next (&unwinder->interp_iter, frame);
682 if (!unwinder->in_interp) {
683 return unwinder_unwind_frame (unwinder, domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf, save_locations, frame);
687 gboolean res = mono_find_jit_info_ext (domain, jit_tls, prev_ji, ctx, new_ctx, trace, lmf,
688 save_locations, frame);
691 if (frame->type == FRAME_TYPE_INTERP_TO_MANAGED) {
692 unwinder->in_interp = TRUE;
693 mono_interp_frame_iter_init (&unwinder->interp_iter, frame->interp_exit_data);
700 * This function is async-safe.
703 get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx)
705 MonoGenericJitInfo *gi;
709 if (!ji->has_generic_jit_info)
711 gi = mono_jit_info_get_generic_jit_info (ji);
717 * Search location list if available, it contains the precise location of the
718 * argument for every pc offset, even if the method was interrupted while it was in
722 int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start;
725 for (i = 0; i < gi->nlocs; ++i) {
726 MonoDwarfLocListEntry *entry = &gi->locations [i];
728 if (offset >= entry->from && (offset < entry->to || entry->to == 0)) {
730 info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg);
732 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset);
736 g_assert (i < gi->nlocs);
739 info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg);
741 info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) +
745 method = jinfo_get_method (ji);
746 if (mono_method_get_context (method)->method_inst) {
747 /* A MonoMethodRuntimeGenericContext* */
749 } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) {
753 /* Avoid returning a managed object */
754 MonoObject *this_obj = (MonoObject *)info;
756 return this_obj->vtable;
761 * generic_info is either a MonoMethodRuntimeGenericContext or a MonoVTable.
763 static MonoGenericContext
764 get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
766 MonoGenericContext context = { NULL, NULL };
767 MonoClass *klass, *method_container_class;
770 g_assert (generic_info);
772 method = jinfo_get_method (ji);
773 g_assert (method->is_inflated);
774 if (mono_method_get_context (method)->method_inst) {
775 MonoMethodRuntimeGenericContext *mrgctx = (MonoMethodRuntimeGenericContext *)generic_info;
777 klass = mrgctx->class_vtable->klass;
778 context.method_inst = mrgctx->method_inst;
779 g_assert (context.method_inst);
781 MonoVTable *vtable = (MonoVTable *)generic_info;
783 klass = vtable->klass;
786 //g_assert (!mono_class_is_gtd (method->klass));
787 if (mono_class_is_ginst (method->klass))
788 method_container_class = mono_class_get_generic_class (method->klass)->container_class;
790 method_container_class = method->klass;
792 /* class might refer to a subclass of method's class */
793 while (!(klass == method->klass || (mono_class_is_ginst (klass) && mono_class_get_generic_class (klass)->container_class == method_container_class))) {
794 klass = klass->parent;
798 if (mono_class_is_ginst (klass) || mono_class_is_gtd (klass))
799 context.class_inst = mini_class_get_context (klass)->class_inst;
801 if (mono_class_is_ginst (klass))
802 g_assert (mono_class_has_parent_and_ignore_generics (mono_class_get_generic_class (klass)->container_class, method_container_class));
804 g_assert (mono_class_has_parent_and_ignore_generics (klass, method_container_class));
810 get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info)
813 MonoGenericContext context;
816 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
817 return jinfo_get_method (ji);
818 context = get_generic_context_from_stack_frame (ji, generic_info);
820 method = jinfo_get_method (ji);
821 method = mono_method_get_declaring_generic_method (method);
822 method = mono_class_inflate_generic_method_checked (method, &context, &error);
823 g_assert (mono_error_ok (&error)); /* FIXME don't swallow the error */
829 * mono_exception_walk_native_trace:
830 * \param ex The exception object whose frames should be walked
831 * \param func callback to call for each stack frame
832 * \param user_data data passed to the callback
833 * This function walks the stacktrace of an exception. For
834 * each frame the callback function is called with the relevant info.
835 * The walk ends when no more stack frames are found or when the callback
836 * returns a TRUE value.
840 mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data)
842 MONO_REQ_GC_UNSAFE_MODE;
844 MonoDomain *domain = mono_domain_get ();
845 MonoArray *ta = ex->trace_ips;
851 len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
852 for (i = 0; i < len; i++) {
853 ExceptionTraceIp trace_ip;
855 memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
856 gpointer ip = trace_ip.ip;
857 gpointer generic_info = trace_ip.generic_info;
858 MonoJitInfo *ji = mono_jit_info_table_find (domain, (char *)ip);
861 if (func (NULL, ip, 0, FALSE, user_data))
864 MonoMethod *method = get_method_from_stack_frame (ji, generic_info);
865 if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data))
874 ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info)
877 MonoDomain *domain = mono_domain_get ();
879 MonoArray *ta = exc->trace_ips;
880 MonoDebugSourceLocation *location;
884 /* Exception is not thrown yet */
885 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, 0, &error);
886 mono_error_set_pending_exception (&error);
890 len = mono_array_length (ta) / TRACE_IP_ENTRY_SIZE;
892 res = mono_array_new_checked (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0, &error);
893 if (mono_error_set_pending_exception (&error))
896 for (i = skip; i < len; i++) {
898 MonoStackFrame *sf = (MonoStackFrame *)mono_object_new_checked (domain, mono_defaults.stack_frame_class, &error);
899 if (!mono_error_ok (&error)) {
900 mono_error_set_pending_exception (&error);
903 ExceptionTraceIp trace_ip;
904 memcpy (&trace_ip, mono_array_addr_fast (ta, ExceptionTraceIp, i), sizeof (ExceptionTraceIp));
905 gpointer ip = trace_ip.ip;
906 gpointer generic_info = trace_ip.generic_info;
909 ji = mono_jit_info_table_find (domain, (char *)ip);
911 /* Unmanaged frame */
912 mono_array_setref (res, i, sf);
916 g_assert (ji != NULL);
919 /* Can't resolve actual method */
920 method = jinfo_get_method (ji);
922 method = get_method_from_stack_frame (ji, generic_info);
923 if (jinfo_get_method (ji)->wrapper_type) {
927 s = mono_method_get_name_full (method, TRUE, FALSE, MONO_TYPE_NAME_FORMAT_REFLECTION);
928 MonoString *name = mono_string_new_checked (domain, s, &error);
930 if (!is_ok (&error)) {
931 mono_error_set_pending_exception (&error);
934 MONO_OBJECT_SETREF (sf, internal_method_name, name);
937 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, method, NULL, &error);
938 if (!mono_error_ok (&error)) {
939 mono_error_set_pending_exception (&error);
942 MONO_OBJECT_SETREF (sf, method, rm);
945 sf->method_index = ji->from_aot ? mono_aot_find_method_index (method) : 0xffffff;
946 sf->method_address = (gsize) ji->code_start;
947 sf->native_offset = (char *)ip - (char *)ji->code_start;
950 * mono_debug_lookup_source_location() returns both the file / line number information
951 * and the IL offset. Note that computing the IL offset is already an expensive
952 * operation, so we shouldn't call this method twice.
954 location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain);
956 sf->il_offset = location->il_offset;
959 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (ji), sf->native_offset, NULL, &sp))
960 sf->il_offset = sp.il_offset;
965 if (need_file_info) {
966 if (location && location->source_file) {
967 MonoString *filename = mono_string_new_checked (domain, location->source_file, &error);
968 if (!is_ok (&error)) {
969 mono_error_set_pending_exception (&error);
972 MONO_OBJECT_SETREF (sf, filename, filename);
973 sf->line = location->row;
974 sf->column = location->column;
976 sf->line = sf->column = 0;
981 mono_debug_free_source_location (location);
982 mono_array_setref (res, i, sf);
989 mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
992 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
993 if (jit_tls && jit_tls->orig_ex_ctx_set)
994 start_ctx = &jit_tls->orig_ex_ctx;
996 mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data);
999 * mono_walk_stack_with_ctx:
1000 * Unwind the current thread starting at \p start_ctx.
1001 * If \p start_ctx is null, we capture the current context.
1004 mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data)
1006 MonoContext extra_ctx;
1007 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
1008 MONO_ARCH_CONTEXT_DEF
1010 if (!thread || !thread->jit_data)
1014 mono_arch_flush_register_windows ();
1016 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1017 MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx);
1019 MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx);
1021 start_ctx = &extra_ctx;
1024 mono_walk_stack_full (func, start_ctx, mono_domain_get (), (MonoJitTlsData *)thread->jit_data, mono_get_lmf (), unwind_options, user_data);
1028 * mono_walk_stack_with_state:
1029 * Unwind a thread described by \p state.
1031 * State must be valid (state->valid == TRUE).
1033 * If you are using this function to unwind another thread, make sure it is suspended.
1035 * If \p state is null, we capture the current context.
1038 mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data)
1040 MonoThreadUnwindState extra_state;
1042 g_assert (!mono_thread_info_is_async_context ());
1043 if (!mono_thread_state_init_from_current (&extra_state))
1045 state = &extra_state;
1048 g_assert (state->valid);
1050 if (!state->unwind_data [MONO_UNWIND_DATA_DOMAIN])
1054 mono_walk_stack_full (func,
1056 (MonoDomain *)state->unwind_data [MONO_UNWIND_DATA_DOMAIN],
1057 (MonoJitTlsData *)state->unwind_data [MONO_UNWIND_DATA_JIT_TLS],
1058 (MonoLMF *)state->unwind_data [MONO_UNWIND_DATA_LMF],
1059 unwind_options, user_data);
1063 mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data)
1065 MonoThreadUnwindState state;
1066 if (!mono_thread_state_init_from_current (&state))
1068 mono_walk_stack_with_state (func, &state, options, user_data);
1072 * mono_walk_stack_full:
1073 * \param func callback to call for each stack frame
1074 * \param domain starting appdomain, can be NULL to use the current domain
1075 * \param unwind_options what extra information the unwinder should gather
1076 * \param start_ctx starting state of the stack walk, can be NULL.
1077 * \param thread the thread whose stack to walk, can be NULL to use the current thread
1078 * \param lmf the LMF of \p thread, can be NULL to use the LMF of the current thread
1079 * \param user_data data passed to the callback
1080 * This function walks the stack of a thread, starting from the state
1081 * represented by \p start_ctx. For each frame the callback
1082 * function is called with the relevant info. The walk ends when no more
1083 * managed stack frames are found or when the callback returns a TRUE value.
1086 mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data)
1089 MonoContext ctx, new_ctx;
1090 StackFrameInfo frame;
1092 mgreg_t *reg_locations [MONO_MAX_IREGS];
1093 mgreg_t *new_reg_locations [MONO_MAX_IREGS];
1094 gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS;
1095 gboolean async = mono_thread_info_is_async_context ();
1098 if (mono_llvm_only) {
1104 ips = get_unwind_backtrace ();
1105 for (l = ips; l; l = l->next) {
1106 guint8 *ip = (guint8*)l->data;
1107 memset (&frame, 0, sizeof (StackFrameInfo));
1108 frame.ji = mini_jit_info_table_find (domain, (char*)ip, &frame.domain);
1109 if (!frame.ji || frame.ji->is_trampoline)
1111 frame.type = FRAME_TYPE_MANAGED;
1112 frame.method = jinfo_get_method (frame.ji);
1113 // FIXME: Cannot lookup the actual method
1114 frame.actual_method = frame.method;
1115 if (frame.type == FRAME_TYPE_MANAGED) {
1116 if (!frame.method->wrapper_type || frame.method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD)
1117 frame.managed = TRUE;
1119 frame.native_offset = ip - (guint8*)frame.ji->code_start;
1120 frame.il_offset = -1;
1122 if (func (&frame, NULL, user_data))
1129 g_assert (start_ctx);
1132 /*The LMF will be null if the target have no managed frames.*/
1133 /* g_assert (lmf); */
1136 g_assert (unwind_options == MONO_UNWIND_NONE);
1138 memcpy (&ctx, start_ctx, sizeof (MonoContext));
1139 memset (reg_locations, 0, sizeof (reg_locations));
1141 unwinder_init (&unwinder);
1143 while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) {
1145 res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame);
1149 if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji && !frame.ji->is_trampoline) {
1150 MonoDebugSourceLocation *source;
1152 source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain);
1154 il_offset = source->il_offset;
1157 if (mono_find_prev_seq_point_for_native_offset (domain, jinfo_get_method (frame.ji), frame.native_offset, NULL, &sp))
1158 il_offset = sp.il_offset;
1162 mono_debug_free_source_location (source);
1166 frame.il_offset = il_offset;
1168 if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji && !frame.ji->is_trampoline) {
1169 frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx));
1171 frame.actual_method = frame.method;
1174 if (get_reg_locations)
1175 frame.reg_locations = reg_locations;
1177 if (func (&frame, &ctx, user_data))
1180 if (get_reg_locations) {
1181 for (i = 0; i < MONO_MAX_IREGS; ++i)
1182 if (new_reg_locations [i])
1183 reg_locations [i] = new_reg_locations [i];
1191 ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info,
1192 MonoReflectionMethod **method,
1193 gint32 *iloffset, gint32 *native_offset,
1194 MonoString **file, gint32 *line, gint32 *column)
1197 MonoDomain *domain = mono_domain_get ();
1198 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
1199 MonoLMF *lmf = mono_get_lmf ();
1200 MonoJitInfo *ji = NULL;
1201 MonoContext ctx, new_ctx;
1202 MonoDebugSourceLocation *location;
1203 MonoMethod *jmethod = NULL, *actual_method;
1204 StackFrameInfo frame;
1209 MONO_ARCH_CONTEXT_DEF;
1211 if (mono_llvm_only) {
1213 MonoDomain *frame_domain;
1214 guint8 *frame_ip = NULL;
1216 /* FIXME: Generalize this code with an interface which returns an array of StackFrame structures */
1218 ips = get_unwind_backtrace ();
1219 for (l = ips; l && skip >= 0; l = l->next) {
1220 guint8 *ip = (guint8*)l->data;
1224 ji = mini_jit_info_table_find (mono_domain_get (), (char*)ip, &frame_domain);
1225 if (!ji || ji->is_trampoline)
1228 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1229 jmethod = jinfo_get_method (ji);
1230 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1237 /* No way to resolve generic instances */
1238 actual_method = jmethod;
1239 *native_offset = frame_ip - (guint8*)ji->code_start;
1241 mono_arch_flush_register_windows ();
1243 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
1244 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx);
1246 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info);
1249 unwinder_init (&unwinder);
1254 res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1257 switch (frame.type) {
1258 case FRAME_TYPE_MANAGED_TO_NATIVE:
1259 case FRAME_TYPE_DEBUGGER_INVOKE:
1260 case FRAME_TYPE_TRAMPOLINE:
1261 case FRAME_TYPE_INTERP_TO_MANAGED:
1263 case FRAME_TYPE_INTERP:
1268 *native_offset = frame.native_offset;
1270 /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */
1271 jmethod = jinfo_get_method (ji);
1272 if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE)
1277 } while (skip >= 0);
1279 if (frame.type == FRAME_TYPE_INTERP) {
1280 jmethod = frame.method;
1281 actual_method = frame.actual_method;
1282 *native_offset = frame.native_offset;
1284 actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx));
1288 MonoReflectionMethod *rm = mono_method_get_object_checked (domain, actual_method, NULL, &error);
1289 if (!mono_error_ok (&error)) {
1290 mono_error_set_pending_exception (&error);
1293 mono_gc_wbarrier_generic_store (method, (MonoObject*) rm);
1295 if (il_offset != -1) {
1296 location = mono_debug_lookup_source_location_by_il (jmethod, il_offset, domain);
1298 location = mono_debug_lookup_source_location (jmethod, *native_offset, domain);
1301 *iloffset = location->il_offset;
1305 if (need_file_info) {
1307 MonoString *filename = mono_string_new_checked (domain, location->source_file, &error);
1308 if (!is_ok (&error)) {
1309 mono_error_set_pending_exception (&error);
1312 mono_gc_wbarrier_generic_store (file, (MonoObject*)filename);
1313 *line = location->row;
1314 *column = location->column;
1317 *line = *column = 0;
1321 mono_debug_free_source_location (location);
1327 get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx)
1330 MonoClass *catch_class = ei->data.catch_class;
1331 MonoType *inflated_type;
1332 MonoGenericContext context;
1334 /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/
1335 if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE)
1338 if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this)
1340 context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx));
1342 /* FIXME: we shouldn't inflate but instead put the
1343 type in the rgctx and fetch it from there. It
1344 might be a good idea to do this lazily, i.e. only
1345 when the exception is actually thrown, so as not to
1346 waste space for exception clauses which might never
1348 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
1349 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
1351 catch_class = mono_class_from_mono_type (inflated_type);
1352 mono_metadata_free_type (inflated_type);
1358 * mini_jit_info_table_find_ext:
1360 * Same as mono_jit_info_table_find, but search all the domains of the current thread
1361 * if ADDR is not found in DOMAIN. The domain where the method was found is stored into
1362 * OUT_DOMAIN if it is not NULL.
1365 mini_jit_info_table_find_ext (MonoDomain *domain, char *addr, gboolean allow_trampolines, MonoDomain **out_domain)
1368 MonoInternalThread *t = mono_thread_internal_current ();
1374 ji = mono_jit_info_table_find_internal (domain, addr, TRUE, allow_trampolines);
1377 *out_domain = domain;
1381 /* maybe it is shared code, so we also search in the root domain */
1382 if (domain != mono_get_root_domain ()) {
1383 ji = mono_jit_info_table_find_internal (mono_get_root_domain (), addr, TRUE, allow_trampolines);
1386 *out_domain = mono_get_root_domain ();
1394 refs = (gpointer *)((t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL);
1395 for (; refs && *refs; refs++) {
1396 if (*refs != domain && *refs != mono_get_root_domain ()) {
1397 ji = mono_jit_info_table_find_internal ((MonoDomain*) *refs, addr, TRUE, allow_trampolines);
1400 *out_domain = (MonoDomain*) *refs;
1410 mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain)
1412 return mini_jit_info_table_find_ext (domain, addr, FALSE, out_domain);
1415 /* Class lazy loading functions */
1416 static GENERATE_GET_CLASS_WITH_CACHE (runtime_compat_attr, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute")
1419 * wrap_non_exception_throws:
1421 * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the
1422 * WrapNonExceptionThrows flag set.
1425 wrap_non_exception_throws (MonoMethod *m)
1428 MonoAssembly *ass = m->klass->image->assembly;
1429 MonoCustomAttrInfo* attrs;
1432 gboolean val = FALSE;
1435 if (ass->wrap_non_exception_throws_inited)
1436 return ass->wrap_non_exception_throws;
1438 klass = mono_class_get_runtime_compat_attr_class ();
1440 attrs = mono_custom_attrs_from_assembly_checked (ass, FALSE, &error);
1441 mono_error_cleanup (&error); /* FIXME don't swallow the error */
1443 for (i = 0; i < attrs->num_attrs; ++i) {
1444 MonoCustomAttrEntry *attr = &attrs->attrs [i];
1446 int num_named, named_type, name_len;
1449 if (!attr->ctor || attr->ctor->klass != klass)
1451 /* Decode the RuntimeCompatibilityAttribute. See reflection.c */
1452 p = (const char*)attr->data;
1453 g_assert (read16 (p) == 0x0001);
1455 num_named = read16 (p);
1461 /* data_type = *p; */
1464 if (named_type != 0x54)
1466 name_len = mono_metadata_decode_blob_size (p, &p);
1467 name = (char *)g_malloc (name_len + 1);
1468 memcpy (name, p, name_len);
1469 name [name_len] = 0;
1471 g_assert (!strcmp (name, "WrapNonExceptionThrows"));
1473 /* The value is a BOOLEAN */
1476 mono_custom_attrs_free (attrs);
1479 ass->wrap_non_exception_throws = val;
1480 mono_memory_barrier ();
1481 ass->wrap_non_exception_throws_inited = TRUE;
1486 #define MAX_UNMANAGED_BACKTRACE 128
1488 build_native_trace (MonoError *error)
1491 /* This puppy only makes sense on mobile, IOW, ARM. */
1492 #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM)
1494 void *native_trace [MAX_UNMANAGED_BACKTRACE];
1497 size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE);
1503 res = mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, size, error);
1504 return_val_if_nok (error, NULL);
1506 for (i = 0; i < size; i++)
1507 mono_array_set (res, gpointer, i, native_trace [i]);
1515 setup_stack_trace (MonoException *mono_ex, GSList *dynamic_methods, GList **trace_ips)
1518 *trace_ips = g_list_reverse (*trace_ips);
1520 MonoArray *ips_arr = mono_glist_to_array (*trace_ips, mono_defaults.int_class, &error);
1521 mono_error_assert_ok (&error);
1522 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
1523 MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace (&error));
1524 mono_error_assert_ok (&error);
1525 if (dynamic_methods) {
1526 /* These methods could go away anytime, so save a reference to them in the exception object */
1528 MonoMList *list = NULL;
1530 for (l = dynamic_methods; l; l = l->next) {
1532 MonoDomain *domain = mono_domain_get ();
1534 if (domain->method_to_dyn_method) {
1535 mono_domain_lock (domain);
1536 dis_link = (guint32)(size_t)g_hash_table_lookup (domain->method_to_dyn_method, l->data);
1537 mono_domain_unlock (domain);
1539 MonoObject *o = mono_gchandle_get_target (dis_link);
1541 list = mono_mlist_prepend_checked (list, o, &error);
1542 mono_error_assert_ok (&error);
1548 MONO_OBJECT_SETREF (mono_ex, dynamic_methods, list);
1551 g_list_free (*trace_ips);
1556 * mono_handle_exception_internal_first_pass:
1558 * The first pass of exception handling. Unwind the stack until a catch clause which can catch
1559 * OBJ is found. Run the index of the filter clause which caught the exception into
1560 * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise.
1563 mono_handle_exception_internal_first_pass (MonoContext *ctx, MonoObject *obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception)
1566 MonoDomain *domain = mono_domain_get ();
1567 MonoJitInfo *ji = NULL;
1568 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1569 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
1570 MonoLMF *lmf = mono_get_lmf ();
1571 GList *trace_ips = NULL;
1572 GSList *dynamic_methods = NULL;
1573 MonoException *mono_ex;
1574 gboolean stack_overflow = FALSE;
1575 MonoContext initial_ctx;
1577 int frame_count = 0;
1584 g_assert (ctx != NULL);
1586 if (obj == (MonoObject *)domain->stack_overflow_ex)
1587 stack_overflow = TRUE;
1589 mono_ex = (MonoException*)obj;
1590 MonoArray *initial_trace_ips = mono_ex->trace_ips;
1591 if (initial_trace_ips) {
1592 int len = mono_array_length (initial_trace_ips) / TRACE_IP_ENTRY_SIZE;
1594 for (i = 0; i < (len - 1); i++) {
1595 for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
1596 gpointer p = mono_array_get (initial_trace_ips, gpointer, (i * TRACE_IP_ENTRY_SIZE) + j);
1597 trace_ips = g_list_prepend (trace_ips, p);
1602 if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1603 mono_error_assert_ok (&error);
1608 call_filter = (int (*) (MonoContext *, void *))mono_get_call_filter ();
1610 g_assert (jit_tls->end_of_stack);
1611 g_assert (jit_tls->abort_func);
1614 *out_filter_idx = -1;
1618 *out_prev_ji = NULL;
1622 unwinder_init (&unwinder);
1625 MonoContext new_ctx;
1627 int clause_index_start = 0;
1628 gboolean unwind_res = TRUE;
1630 StackFrameInfo frame;
1635 unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
1637 setup_stack_trace (mono_ex, dynamic_methods, &trace_ips);
1638 g_slist_free (dynamic_methods);
1642 switch (frame.type) {
1643 case FRAME_TYPE_DEBUGGER_INVOKE:
1644 case FRAME_TYPE_MANAGED_TO_NATIVE:
1645 case FRAME_TYPE_TRAMPOLINE:
1646 case FRAME_TYPE_INTERP_TO_MANAGED:
1649 case FRAME_TYPE_INTERP:
1650 case FRAME_TYPE_MANAGED:
1653 g_assert_not_reached ();
1657 in_interp = frame.type == FRAME_TYPE_INTERP;
1662 ip = (guint8*)ji->code_start + frame.native_offset;
1664 ip = MONO_CONTEXT_GET_IP (ctx);
1667 method = jinfo_get_method (ji);
1668 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
1670 if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) {
1671 g_error ("A native frame was found while unwinding the stack after an exception.\n"
1672 "The native frame called the managed method:\n%s\n",
1673 mono_method_full_name (method, TRUE));
1676 if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) {
1677 // avoid giant stack traces during a stack overflow
1678 if (frame_count < 1000) {
1679 trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx));
1680 trace_ips = g_list_prepend (trace_ips, get_generic_info_from_stack_frame (ji, ctx));
1684 if (method->dynamic)
1685 dynamic_methods = g_slist_prepend (dynamic_methods, method);
1687 if (stack_overflow) {
1688 if (MONO_ARCH_STACK_GROWS_UP)
1689 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
1691 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
1693 free_stack = 0xffffff;
1696 for (i = clause_index_start; i < ji->num_clauses; i++) {
1697 MonoJitExceptionInfo *ei = &ji->clauses [i];
1698 gboolean filtered = FALSE;
1701 * During stack overflow, wait till the unwinding frees some stack
1702 * space before running handlers/finalizers.
1704 if (free_stack <= (64 * 1024))
1707 if (is_address_protected (ji, ei, ip)) {
1709 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
1712 * Have to unwrap RuntimeWrappedExceptions if the
1713 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
1715 if (non_exception && !wrap_non_exception_throws (method))
1716 ex_obj = non_exception;
1720 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
1721 #ifndef DISABLE_PERFCOUNTERS
1722 mono_perfcounters->exceptions_filters++;
1725 #ifndef MONO_CROSS_COMPILE
1726 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
1728 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
1730 /* Can't pass the ex object in a register yet to filter clauses, because call_filter () might not support it */
1731 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1733 g_assert (!ji->from_llvm);
1734 /* store the exception object in bp + ei->exvar_offset */
1735 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
1739 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
1741 * Pass the original il clause index to the landing pad so it can
1742 * branch to the landing pad associated with the il clause.
1743 * This is needed because llvm compiled code assumes that the EH
1744 * code always branches to the innermost landing pad.
1747 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
1750 mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx);
1751 filtered = call_filter (ctx, ei->data.filter);
1752 mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx);
1753 if (filtered && out_filter_idx)
1754 *out_filter_idx = filter_idx;
1760 setup_stack_trace (mono_ex, dynamic_methods, &trace_ips);
1761 g_slist_free (dynamic_methods);
1762 /* mono_debugger_agent_handle_exception () needs this */
1763 mini_set_abort_threshold (ctx);
1764 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1769 MonoError isinst_error;
1770 error_init (&isinst_error);
1771 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (ex_obj, catch_class, &error)) {
1772 setup_stack_trace (mono_ex, dynamic_methods, &trace_ips);
1773 g_slist_free (dynamic_methods);
1778 /* mono_debugger_agent_handle_exception () needs this */
1780 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
1783 mono_error_cleanup (&isinst_error);
1790 g_assert_not_reached ();
1794 * mono_handle_exception_internal:
1795 * \param ctx saved processor state
1796 * \param obj the exception object
1797 * \param resume whenever to resume unwinding based on the state in \c MonoJitTlsData.
1800 mono_handle_exception_internal (MonoContext *ctx, MonoObject *obj, gboolean resume, MonoJitInfo **out_ji)
1803 MonoDomain *domain = mono_domain_get ();
1804 MonoJitInfo *ji, *prev_ji;
1805 static int (*call_filter) (MonoContext *, gpointer) = NULL;
1806 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
1807 MonoLMF *lmf = mono_get_lmf ();
1808 MonoException *mono_ex;
1809 gboolean stack_overflow = FALSE;
1810 MonoContext initial_ctx;
1812 int frame_count = 0;
1813 gint32 filter_idx, first_filter_idx = 0;
1816 MonoObject *non_exception = NULL;
1820 g_assert (ctx != NULL);
1822 MonoException *ex = mono_get_exception_null_reference ();
1823 MonoString *msg = mono_string_new_checked (domain, "Object reference not set to an instance of an object", &error);
1824 mono_error_assert_ok (&error);
1825 MONO_OBJECT_SETREF (ex, message, msg);
1826 obj = (MonoObject *)ex;
1830 * Allocate a new exception object instead of the preconstructed ones.
1832 if (obj == (MonoObject *)domain->stack_overflow_ex) {
1834 * It is not a good idea to try and put even more pressure on the little stack available.
1835 * obj = mono_get_exception_stack_overflow ();
1837 stack_overflow = TRUE;
1839 else if (obj == (MonoObject *)domain->null_reference_ex) {
1840 obj = (MonoObject *)mono_get_exception_null_reference ();
1843 if (!mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1844 mono_error_assert_ok (&error);
1845 non_exception = obj;
1846 obj = (MonoObject *)mono_get_exception_runtime_wrapped_checked (obj, &error);
1847 mono_error_assert_ok (&error);
1850 mono_ex = (MonoException*)obj;
1852 if (mini_get_debug_options ()->suspend_on_exception) {
1853 mono_runtime_printf_err ("Exception thrown, suspending...");
1858 if (mono_object_isinst_checked (obj, mono_defaults.exception_class, &error)) {
1859 mono_ex = (MonoException*)obj;
1861 mono_error_assert_ok (&error);
1865 if (mono_ex && jit_tls->class_cast_from) {
1866 if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) {
1867 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1868 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1869 char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name);
1870 mono_ex->message = mono_string_new_checked (domain, msg, &error);
1873 if (!is_ok (&error)) {
1874 mono_runtime_printf_err ("Error creating class cast exception message '%s'\n", msg);
1875 mono_error_assert_ok (&error);
1879 if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) {
1880 char *from_name = mono_type_get_full_name (jit_tls->class_cast_from);
1881 char *to_name = mono_type_get_full_name (jit_tls->class_cast_to);
1882 char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name);
1883 mono_ex->message = mono_string_new_checked (domain, msg, &error);
1886 if (!is_ok (&error)) {
1887 mono_runtime_printf_err ("Error creating array type mismatch exception message '%s'\n", msg);
1888 mono_error_assert_ok (&error);
1895 call_filter = (int (*)(MonoContext *, void*))mono_get_call_filter ();
1897 g_assert (jit_tls->end_of_stack);
1898 g_assert (jit_tls->abort_func);
1901 * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't
1902 * end up being TRUE on any code path.
1904 memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext));
1909 MonoContext ctx_cp = *ctx;
1910 if (mono_trace_is_enabled ()) {
1911 MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0);
1912 MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message);
1913 MonoObject *message;
1914 const char *type_name = mono_class_get_name (mono_object_class (mono_ex));
1916 if (get_message == NULL) {
1918 } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) {
1920 msg = g_strdup_printf ("(No exception message for: %s)\n", type_name);
1922 MonoObject *exc = NULL;
1923 message = mono_runtime_try_invoke (get_message, obj, NULL, &exc, &error);
1924 g_assert (exc == NULL);
1925 mono_error_assert_ok (&error);
1929 msg = mono_string_to_utf8_checked ((MonoString *) message, &error);
1930 if (!is_ok (&error)) {
1931 mono_error_cleanup (&error);
1932 msg = g_strdup ("(error while display System.Exception.Message property)");
1935 msg = g_strdup ("(System.Exception.Message property not available)");
1938 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);
1940 if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex)))
1941 mono_print_thread_dump_from_ctx (ctx);
1943 jit_tls->orig_ex_ctx_set = TRUE;
1944 MONO_PROFILER_RAISE (exception_throw, (obj));
1945 jit_tls->orig_ex_ctx_set = FALSE;
1947 res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception);
1950 if (mini_get_debug_options ()->break_on_exc)
1952 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1954 if (mini_get_debug_options ()->suspend_on_unhandled) {
1955 mono_runtime_printf_err ("Unhandled exception, suspending...");
1960 // FIXME: This runs managed code so it might cause another stack overflow when
1961 // we are handling a stack overflow
1962 mini_set_abort_threshold (ctx);
1963 mono_unhandled_exception (obj);
1965 gboolean unhandled = FALSE;
1968 * The exceptions caught by the mono_runtime_invoke_checked () calls
1969 * in the threadpool needs to be treated as unhandled (#669836).
1971 * FIXME: The check below is hackish, but its hard to distinguish
1972 * these runtime invoke calls from others in the runtime.
1974 if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) {
1975 if (prev_ji && jinfo_get_method (prev_ji) == mono_defaults.threadpool_perform_wait_callback_method)
1980 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, NULL);
1982 mono_debugger_agent_handle_exception ((MonoException *)obj, ctx, &ctx_cp);
1991 unwinder_init (&unwinder);
1994 MonoContext new_ctx;
1996 int clause_index_start = 0;
1997 gboolean unwind_res = TRUE;
1998 StackFrameInfo frame;
2003 ji = jit_tls->resume_state.ji;
2004 new_ctx = jit_tls->resume_state.new_ctx;
2005 clause_index_start = jit_tls->resume_state.clause_index;
2006 lmf = jit_tls->resume_state.lmf;
2007 first_filter_idx = jit_tls->resume_state.first_filter_idx;
2008 filter_idx = jit_tls->resume_state.filter_idx;
2011 unwind_res = unwinder_unwind_frame (&unwinder, domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame);
2013 *(mono_get_lmf_addr ()) = lmf;
2015 jit_tls->abort_func (obj);
2016 g_assert_not_reached ();
2018 switch (frame.type) {
2019 case FRAME_TYPE_DEBUGGER_INVOKE:
2020 case FRAME_TYPE_MANAGED_TO_NATIVE:
2021 case FRAME_TYPE_TRAMPOLINE:
2024 case FRAME_TYPE_INTERP_TO_MANAGED:
2026 case FRAME_TYPE_INTERP:
2027 case FRAME_TYPE_MANAGED:
2030 g_assert_not_reached ();
2033 in_interp = frame.type == FRAME_TYPE_INTERP;
2038 ip = (guint8*)ji->code_start + frame.native_offset;
2040 ip = MONO_CONTEXT_GET_IP (ctx);
2042 method = jinfo_get_method (ji);
2044 //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count);
2046 if (stack_overflow) {
2047 if (MONO_ARCH_STACK_GROWS_UP)
2048 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx));
2050 free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx));
2052 free_stack = 0xffffff;
2055 for (i = clause_index_start; i < ji->num_clauses; i++) {
2056 MonoJitExceptionInfo *ei = &ji->clauses [i];
2057 gboolean filtered = FALSE;
2060 * During stack overflow, wait till the unwinding frees some stack
2061 * space before running handlers/finalizers.
2063 if (free_stack <= (64 * 1024))
2066 if (is_address_protected (ji, ei, ip)) {
2068 MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx);
2071 * Have to unwrap RuntimeWrappedExceptions if the
2072 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
2074 if (non_exception && !wrap_non_exception_throws (method))
2075 ex_obj = non_exception;
2079 if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) {
2080 #ifndef MONO_CROSS_COMPILE
2081 #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG
2082 MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj);
2084 g_assert (!ji->from_llvm);
2085 /* store the exception object in bp + ei->exvar_offset */
2086 *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj;
2091 #ifdef MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG
2093 MONO_CONTEXT_SET_LLVM_EH_SELECTOR_REG (ctx, ei->clause_index);
2096 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
2098 * Filter clauses should only be run in the
2099 * first pass of exception handling.
2101 filtered = (filter_idx == first_filter_idx);
2105 error_init (&error);
2106 if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE &&
2107 mono_object_isinst_checked (ex_obj, catch_class, &error)) || filtered) {
2109 * This guards against the situation that we abort a thread that is executing a finally clause
2110 * that was called by the EH machinery. It won't have a guard trampoline installed, so we must
2111 * check for this situation here and resume interruption if we are below the guarded block.
2113 if (G_UNLIKELY (jit_tls->handler_block)) {
2114 gboolean is_outside = FALSE;
2115 gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context);
2116 gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx);
2117 //FIXME make this stack direction aware
2119 if (catch_bp > prot_bp) {
2121 } else if (catch_bp == prot_bp) {
2122 /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {}
2123 * So we check if the catch handler_start is protected by the guarded handler protected region
2126 * If there is an outstanding guarded_block return address, it means the current thread must be aborted.
2127 * This is the only way to reach out the guarded block as other cases are handled by the trampoline.
2128 * There aren't any further finally/fault handler blocks down the stack over this exception.
2129 * This must be ensured by the code that installs the guard trampoline.
2131 g_assert (ji == mini_jit_info_table_find (domain, (char *)MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL));
2133 if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) {
2138 jit_tls->handler_block = NULL;
2139 mono_thread_resume_interruption (TRUE); /*We ignore the exception here, it will be raised later*/
2143 if (mono_trace_is_enabled () && mono_trace_eval (method))
2144 g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE));
2145 jit_tls->orig_ex_ctx_set = TRUE;
2146 MONO_PROFILER_RAISE (exception_clause, (method, i, ei->flags, ex_obj));
2147 jit_tls->orig_ex_ctx_set = FALSE;
2148 mini_set_abort_threshold (ctx);
2152 * ctx->pc points into the interpreter, after the call which transitioned to
2153 * JITted code. Store the unwind state into the
2154 * interpeter state, then resume, the interpreter will unwind itself until
2155 * it reaches the target frame and will continue execution from there.
2156 * The resuming is kinda hackish, from the native code standpoint, it looks
2157 * like the call which transitioned to JITted code has succeeded, but the
2158 * return value register etc. is not set, so we have to be careful.
2160 mono_interp_set_resume_state (jit_tls, mono_ex, frame.interp_frame, ei->handler_start);
2161 /* Undo the IP adjustment done by mono_arch_unwind_frame () */
2162 #if defined(TARGET_AMD64)
2163 ctx->gregs [AMD64_RIP] ++;
2164 #elif defined(TARGET_ARM)
2166 if (mono_arm_thumb_supported ())
2168 #elif defined(TARGET_ARM64)
2174 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
2177 #ifndef DISABLE_PERFCOUNTERS
2178 mono_perfcounters->exceptions_depth += frame_count;
2180 if (obj == (MonoObject *)domain->stack_overflow_ex)
2181 jit_tls->handling_stack_ovf = FALSE;
2185 mono_error_cleanup (&error);
2186 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT) {
2187 if (mono_trace_is_enabled () && mono_trace_eval (method))
2188 g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE));
2189 jit_tls->orig_ex_ctx_set = TRUE;
2190 MONO_PROFILER_RAISE (exception_clause, (method, i, ei->flags, ex_obj));
2191 jit_tls->orig_ex_ctx_set = FALSE;
2193 if (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
2194 if (mono_trace_is_enabled () && mono_trace_eval (method))
2195 g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE));
2196 jit_tls->orig_ex_ctx_set = TRUE;
2197 MONO_PROFILER_RAISE (exception_clause, (method, i, ei->flags, ex_obj));
2198 jit_tls->orig_ex_ctx_set = FALSE;
2199 #ifndef DISABLE_PERFCOUNTERS
2200 mono_perfcounters->exceptions_finallys++;
2203 if (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT || ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY) {
2205 if (ji->from_llvm) {
2207 * LLVM compiled finally handlers follow the design
2208 * of the c++ ehabi, i.e. they call a resume function
2209 * at the end instead of returning to the caller.
2210 * So save the exception handling state,
2211 * mono_resume_unwind () will call us again to continue
2214 jit_tls->resume_state.ex_obj = obj;
2215 jit_tls->resume_state.ji = ji;
2216 jit_tls->resume_state.clause_index = i + 1;
2217 jit_tls->resume_state.ctx = *ctx;
2218 jit_tls->resume_state.new_ctx = new_ctx;
2219 jit_tls->resume_state.lmf = lmf;
2220 jit_tls->resume_state.first_filter_idx = first_filter_idx;
2221 jit_tls->resume_state.filter_idx = filter_idx;
2222 mini_set_abort_threshold (ctx);
2223 MONO_CONTEXT_SET_IP (ctx, ei->handler_start);
2226 mini_set_abort_threshold (ctx);
2228 mono_interp_run_finally (&frame, i, ei->handler_start);
2230 call_filter (ctx, ei->handler_start);
2236 if (MONO_PROFILER_ENABLED (method_exception_leave) &&
2237 mono_profiler_get_call_instrumentation_flags (method) & MONO_PROFILER_CALL_INSTRUMENTATION_EXCEPTION_LEAVE) {
2238 jit_tls->orig_ex_ctx_set = TRUE;
2239 MONO_PROFILER_RAISE (method_exception_leave, (method, ex_obj));
2240 jit_tls->orig_ex_ctx_set = FALSE;
2246 g_assert_not_reached ();
2250 * mono_debugger_run_finally:
2251 * \param start_ctx saved processor state
2252 * This method is called by the Mono Debugger to call all \c finally clauses of the
2253 * current stack frame. It's used when the user issues a \c return command to make
2254 * the current stack frame return. After returning from this method, the debugger
2255 * unwinds the stack one frame and gives control back to the user.
2256 * NOTE: This method is only used when running inside the Mono Debugger.
2259 mono_debugger_run_finally (MonoContext *start_ctx)
2261 static int (*call_filter) (MonoContext *, gpointer) = NULL;
2262 MonoDomain *domain = mono_domain_get ();
2263 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2264 MonoLMF *lmf = mono_get_lmf ();
2265 MonoContext ctx, new_ctx;
2266 MonoJitInfo *ji, rji;
2271 ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL);
2272 if (!ji || ji == (gpointer)-1)
2276 call_filter = (int (*)(MonoContext *, void *))mono_get_call_filter ();
2278 for (i = 0; i < ji->num_clauses; i++) {
2279 MonoJitExceptionInfo *ei = &ji->clauses [i];
2281 if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) &&
2282 (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) {
2283 call_filter (&ctx, ei->handler_start);
2289 * mono_handle_exception:
2290 * \param ctx saved processor state
2291 * \param obj the exception object
2293 * Handle the exception OBJ starting from the state CTX. Modify CTX to point to the handler clause if the exception is caught, and
2297 mono_handle_exception (MonoContext *ctx, MonoObject *obj)
2299 MONO_REQ_GC_UNSAFE_MODE;
2301 #ifndef DISABLE_PERFCOUNTERS
2302 mono_perfcounters->exceptions_thrown++;
2305 return mono_handle_exception_internal (ctx, obj, FALSE, NULL);
2308 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2310 #ifndef MONO_ARCH_USE_SIGACTION
2311 #error "Can't use sigaltstack without sigaction"
2314 #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1))
2317 mono_setup_altstack (MonoJitTlsData *tls)
2321 guint8 *staddr = NULL;
2323 if (mono_running_on_valgrind ())
2326 mono_thread_info_get_stack_bounds (&staddr, &stsize);
2330 tls->end_of_stack = staddr + stsize;
2331 tls->stack_size = stsize;
2333 /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/
2335 tls->stack_ovf_guard_base = staddr + mono_pagesize ();
2336 tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ());
2338 g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size);
2340 if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) {
2341 /* mprotect can fail for the main thread stack */
2342 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, MONO_MEM_ACCOUNT_EXCEPTIONS);
2343 g_assert (gaddr == tls->stack_ovf_guard_base);
2344 tls->stack_ovf_valloced = TRUE;
2347 /* Setup an alternate signal stack */
2348 tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON, MONO_MEM_ACCOUNT_EXCEPTIONS);
2349 tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2351 g_assert (tls->signal_stack);
2353 sa.ss_sp = tls->signal_stack;
2354 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2356 g_assert (sigaltstack (&sa, NULL) == 0);
2358 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);
2362 mono_free_altstack (MonoJitTlsData *tls)
2367 sa.ss_sp = tls->signal_stack;
2368 sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE;
2369 sa.ss_flags = SS_DISABLE;
2370 err = sigaltstack (&sa, NULL);
2371 g_assert (err == 0);
2373 if (tls->signal_stack)
2374 mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MEM_ACCOUNT_EXCEPTIONS);
2375 if (tls->stack_ovf_valloced)
2376 mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MEM_ACCOUNT_EXCEPTIONS);
2378 mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE);
2381 #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2384 mono_setup_altstack (MonoJitTlsData *tls)
2389 mono_free_altstack (MonoJitTlsData *tls)
2393 #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */
2396 try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes)
2398 gint32 unprotect_size = jit_tls->stack_ovf_guard_size;
2399 /* we need to leave some room for throwing the exception */
2400 while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes))
2401 unprotect_size -= mono_pagesize ();
2402 /* at this point we could try and build a new domain->stack_overflow_ex, but only if there
2403 * is sufficient stack
2405 //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);
2407 mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE);
2408 return unprotect_size == jit_tls->stack_ovf_guard_size;
2411 static G_GNUC_UNUSED void
2412 try_more_restore (void)
2414 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2415 if (try_restore_stack_protection (jit_tls, 500))
2416 jit_tls->restore_stack_prot = NULL;
2419 static G_GNUC_UNUSED void
2420 restore_stack_protection (void)
2422 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2423 MonoException *ex = mono_domain_get ()->stack_overflow_ex;
2424 /* if we can't restore the stack protection, keep a callback installed so
2425 * we'll try to restore as much stack as we can at each return from unmanaged
2428 if (try_restore_stack_protection (jit_tls, 4096))
2429 jit_tls->restore_stack_prot = NULL;
2431 jit_tls->restore_stack_prot = try_more_restore_tramp;
2432 /* here we also throw a stack overflow exception */
2433 ex->trace_ips = NULL;
2434 ex->stack_trace = NULL;
2435 mono_raise_exception (ex);
2439 mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp)
2441 MONO_REQ_GC_UNSAFE_MODE;
2443 void (*func)(void) = (void (*)(void))tramp_data;
2449 mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *siginfo, guint8* fault_addr)
2454 /* we got a stack overflow in the soft-guard pages
2455 * There are two cases:
2456 * 1) managed code caused the overflow: we unprotect the soft-guard page
2457 * and let the arch-specific code trigger the exception handling mechanism
2458 * in the thread stack. The soft-guard pages will be protected again as the stack is unwound.
2459 * 2) unmanaged code caused the overflow: we unprotect the soft-guard page
2460 * and hope we can continue with those enabled, at least until the hard-guard page
2461 * is hit. The alternative to continuing here is to just print a message and abort.
2462 * We may add in the future the code to protect the pages again in the codepath
2463 * when we return from unmanaged to managed code.
2465 if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base &&
2466 fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) {
2467 /* we unprotect the minimum amount we can */
2469 gboolean handled = FALSE;
2471 guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4);
2472 while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) {
2473 guard_size -= mono_pagesize ();
2475 guard_size = jit_tls->stack_ovf_guard_size - guard_size;
2476 /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/
2477 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);
2478 #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK
2480 mono_arch_handle_altstack_exception (ctx, siginfo, fault_addr, TRUE);
2485 /* We print a message: after this even managed stack overflows
2486 * may crash the runtime
2488 mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2489 if (!jit_tls->handling_stack_ovf) {
2490 jit_tls->restore_stack_prot = restore_stack_protection_tramp;
2491 jit_tls->handling_stack_ovf = 1;
2493 /*fprintf (stderr, "Already handling stack overflow\n");*/
2502 MonoMethod *omethod;
2504 } PrintOverflowUserData;
2506 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2508 print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2510 MonoMethod *method = NULL;
2511 PrintOverflowUserData *user_data = (PrintOverflowUserData *)data;
2514 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2515 method = jinfo_get_method (frame->ji);
2518 if (user_data->count == 0) {
2519 /* The first frame is in its prolog, so a line number cannot be computed */
2520 user_data->count ++;
2524 /* If this is a one method overflow, skip the other instances */
2525 if (method == user_data->omethod)
2528 location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2529 mono_runtime_printf_err (" %s", location);
2532 if (user_data->count == 1) {
2533 mono_runtime_printf_err (" <...>");
2534 user_data->omethod = method;
2536 user_data->omethod = NULL;
2539 user_data->count ++;
2541 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2548 mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr)
2550 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2551 PrintOverflowUserData ud;
2555 /* we don't do much now, but we can warn the user with a useful message */
2556 mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr);
2558 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2559 mono_sigctx_to_monoctx (ctx, &mctx);
2561 mono_runtime_printf_err ("Stacktrace:");
2563 memset (&ud, 0, sizeof (ud));
2565 mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud);
2567 if (ji && !ji->is_trampoline && jinfo_get_method (ji))
2568 mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE));
2570 mono_runtime_printf_err ("At <unmanaged>.");
2577 print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2579 MonoMethod *method = NULL;
2581 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2582 method = jinfo_get_method (frame->ji);
2585 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ());
2586 mono_runtime_printf_err (" %s", location);
2589 mono_runtime_printf_err (" at <unknown> <0x%05x>", frame->native_offset);
2594 static G_GNUC_UNUSED gboolean
2595 print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2597 GString *p = (GString*)data;
2598 MonoMethod *method = NULL;
2600 if (frame->ji && frame->type != FRAME_TYPE_TRAMPOLINE)
2601 method = jinfo_get_method (frame->ji);
2603 if (method && frame->domain) {
2604 gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, frame->domain);
2605 g_string_append_printf (p, " %s\n", location);
2608 g_string_append_printf (p, " at <unknown> <0x%05x>\n", frame->native_offset);
2613 #ifndef MONO_CROSS_COMPILE
2615 static void print_process_map (void)
2618 FILE *fp = fopen ("/proc/self/maps", "r");
2622 mono_runtime_printf_err ("no /proc/self/maps, not on linux?\n");
2626 mono_runtime_printf_err ("/proc/self/maps:");
2628 while (fgets (line, sizeof (line), fp)) {
2630 size_t len = strlen (line) - 1;
2631 if (len >= 0 && line [len] == '\n')
2634 mono_runtime_printf_err ("%s", line);
2643 static gboolean handle_crash_loop = FALSE;
2646 * mono_handle_native_crash:
2648 * Handle a native crash (e.g. SIGSEGV) while in native code by
2649 * printing diagnostic information and aborting.
2652 mono_handle_native_crash (const char *signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2654 #ifdef MONO_ARCH_USE_SIGACTION
2655 struct sigaction sa;
2657 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2659 if (handle_crash_loop)
2662 if (mini_get_debug_options ()->suspend_on_native_crash) {
2663 mono_runtime_printf_err ("Received %s, suspending...", signal);
2674 /* prevent infinite loops in crash handling */
2675 handle_crash_loop = TRUE;
2677 /* !jit_tls means the thread was not registered with the runtime */
2678 if (jit_tls && mono_thread_internal_current ()) {
2679 mono_runtime_printf_err ("Stacktrace:\n");
2681 /* FIXME: Is MONO_UNWIND_LOOKUP_IL_OFFSET correct here? */
2682 mono_walk_stack (print_stack_frame_to_stderr, MONO_UNWIND_LOOKUP_IL_OFFSET, NULL);
2685 print_process_map ();
2687 #ifdef HAVE_BACKTRACE_SYMBOLS
2693 mono_runtime_printf_err ("\nNative stacktrace:\n");
2695 size = backtrace (array, 256);
2696 names = backtrace_symbols (array, size);
2697 for (i =0; i < size; ++i) {
2698 mono_runtime_printf_err ("\t%s", names [i]);
2702 /* Try to get more meaningful information using gdb */
2704 #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork)
2705 if (!mini_get_debug_options ()->no_gdb_backtrace) {
2706 /* From g_spawn_command_line_sync () in eglib */
2709 pid_t crashed_pid = getpid ();
2712 * glibc fork acquires some locks, so if the crash happened inside malloc/free,
2713 * it will deadlock. Call the syscall directly instead.
2715 #if defined(HOST_ANDROID)
2716 /* SYS_fork is defined to be __NR_fork which is not defined in some ndk versions */
2717 g_assert_not_reached ();
2718 #elif !defined(HOST_DARWIN) && defined(SYS_fork)
2719 pid = (pid_t) syscall (SYS_fork);
2720 #elif defined(HOST_DARWIN) && HAVE_FORK
2721 pid = (pid_t) fork ();
2723 g_assert_not_reached ();
2726 #if defined (HAVE_PRCTL) && defined(PR_SET_PTRACER)
2728 // Allow gdb to attach to the process even if ptrace_scope sysctl variable is set to
2729 // a value other than 0 (the most permissive ptrace scope). Most modern Linux
2730 // distributions set the scope to 1 which allows attaching only to direct children of
2731 // the current process
2732 prctl (PR_SET_PTRACER, pid, 0, 0, 0);
2736 dup2 (STDERR_FILENO, STDOUT_FILENO);
2738 mono_gdb_render_native_backtraces (crashed_pid);
2742 mono_runtime_printf_err ("\nDebug info from gdb:\n");
2743 waitpid (pid, &status, 0);
2749 /* set DUMPABLE for this process so debuggerd can attach with ptrace(2), see:
2750 * https://android.googlesource.com/platform/bionic/+/151da681000c07da3c24cd30a3279b1ca017f452/linker/debugger.cpp#206
2751 * this has changed on later versions of Android. Also, we don't want to
2752 * set this on start-up as DUMPABLE has security implications. */
2753 prctl (PR_SET_DUMPABLE, 1);
2755 mono_runtime_printf_err ("\nNo native Android stacktrace (see debuggerd output).\n");
2760 * A SIGSEGV indicates something went very wrong so we can no longer depend
2761 * on anything working. So try to print out lots of diagnostics, starting
2762 * with ones which have a greater chance of working.
2764 mono_runtime_printf_err (
2766 "=================================================================\n"
2767 "Got a %s while executing native code. This usually indicates\n"
2768 "a fatal error in the mono runtime or one of the native libraries \n"
2769 "used by your application.\n"
2770 "=================================================================\n",
2773 #ifdef MONO_ARCH_USE_SIGACTION
2774 sa.sa_handler = SIG_DFL;
2775 sigemptyset (&sa.sa_mask);
2778 /* Remove our SIGABRT handler */
2779 g_assert (sigaction (SIGABRT, &sa, NULL) != -1);
2781 /* On some systems we get a SIGILL when calling abort (), because it might
2782 * fail to raise SIGABRT */
2783 g_assert (sigaction (SIGILL, &sa, NULL) != -1);
2786 if (!mono_do_crash_chaining) {
2787 /*Android abort is a fluke, it doesn't abort, it triggers another segv. */
2788 #if defined (HOST_ANDROID)
2799 mono_handle_native_crash (const char *signal, void *ctx, MONO_SIG_HANDLER_INFO_TYPE *info)
2801 g_assert_not_reached ();
2804 #endif /* !MONO_CROSS_COMPILE */
2807 mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx)
2809 MonoInternalThread *thread = mono_thread_internal_current ();
2810 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2815 GError *error = NULL;
2820 text = g_string_new (0);
2822 name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error);
2824 g_string_append_printf (text, "\n\"%s\"", name);
2827 else if (thread->threadpool_thread)
2828 g_string_append (text, "\n\"<threadpool thread>\"");
2830 g_string_append (text, "\n\"<unnamed thread>\"");
2832 g_string_append_printf (text, " tid=0x%p this=0x%p ", (gpointer)(gsize)thread->tid, thread);
2833 mono_thread_internal_describe (thread, text);
2834 g_string_append (text, "\n");
2836 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
2838 memcpy (&ctx, start_ctx, sizeof (MonoContext));
2840 MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump);
2842 mono_sigctx_to_monoctx (sigctx, &ctx);
2844 mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text);
2846 mono_runtime_printf ("\t<Stack traces in thread dumps not supported on this platform>");
2849 mono_runtime_printf ("%s", text->str);
2851 #if HOST_WIN32 && TARGET_WIN32 && _DEBUG
2852 OutputDebugStringA(text->str);
2855 g_string_free (text, TRUE);
2856 mono_runtime_stdout_fflush ();
2860 * mono_print_thread_dump:
2862 * Print information about the current thread to stdout.
2863 * \p sigctx can be NULL, allowing this to be called from gdb.
2866 mono_print_thread_dump (void *sigctx)
2868 mono_print_thread_dump_internal (sigctx, NULL);
2872 mono_print_thread_dump_from_ctx (MonoContext *ctx)
2874 mono_print_thread_dump_internal (NULL, ctx);
2878 * mono_resume_unwind:
2880 * This is called by a trampoline from LLVM compiled finally clauses to continue
2884 mono_resume_unwind (MonoContext *ctx)
2886 MONO_REQ_GC_UNSAFE_MODE;
2888 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2889 MonoContext new_ctx;
2891 MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx));
2892 MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx));
2895 mono_handle_exception_internal (&new_ctx, (MonoObject *)jit_tls->resume_state.ex_obj, TRUE, NULL);
2897 mono_restore_context (&new_ctx);
2903 MonoJitExceptionInfo *ei;
2904 } FindHandlerBlockData;
2907 find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data)
2911 FindHandlerBlockData *pdata = (FindHandlerBlockData *)data;
2912 MonoJitInfo *ji = frame->ji;
2917 ip = MONO_CONTEXT_GET_IP (ctx);
2919 for (i = 0; i < ji->num_clauses; ++i) {
2920 MonoJitExceptionInfo *ei = ji->clauses + i;
2921 if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2923 /*If ip points to the first instruction it means the handler block didn't start
2924 so we can leave its execution to the EH machinery*/
2925 if (ei->handler_start <= ip && ip < ei->data.handler_end) {
2937 install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx)
2940 MonoJitExceptionInfo *clause = NULL;
2944 ip = MONO_CONTEXT_GET_IP (ctx);
2946 for (i = 0; i < ji->num_clauses; ++i) {
2947 clause = &ji->clauses [i];
2948 if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY)
2950 if (clause->handler_start <= ip && clause->data.handler_end > ip)
2954 /*no matching finally */
2955 if (i == ji->num_clauses)
2959 bp = (guint8*)MONO_CONTEXT_GET_BP (ctx);
2960 *(bp + clause->exvar_offset) = 1;
2964 * Finds the bottom handler block running and install a block guard if needed.
2967 mono_install_handler_block_guard (MonoThreadUnwindState *ctx)
2969 FindHandlerBlockData data = { 0 };
2970 MonoJitTlsData *jit_tls = (MonoJitTlsData *)ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS];
2972 /* Guard against a null MonoJitTlsData. This can happens if the thread receives the
2973 * interrupt signal before the JIT has time to initialize its TLS data for the given thread.
2975 if (!jit_tls || jit_tls->handler_block)
2978 /* Do an async safe stack walk */
2979 mono_thread_info_set_is_async_context (TRUE);
2980 mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data);
2981 mono_thread_info_set_is_async_context (FALSE);
2986 memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext));
2988 install_handler_block_guard (data.ji, &data.ctx);
2990 jit_tls->handler_block = data.ei;
2996 mono_current_thread_has_handle_block_guard (void)
2998 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
2999 return jit_tls && jit_tls->handler_block != NULL;
3003 mono_set_cast_details (MonoClass *from, MonoClass *to)
3005 MonoJitTlsData *jit_tls = NULL;
3007 if (mini_get_debug_options ()->better_cast_details) {
3008 jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
3009 jit_tls->class_cast_from = from;
3010 jit_tls->class_cast_to = to;
3015 /*returns false if the thread is not attached*/
3017 mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx)
3019 #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX
3020 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
3027 mono_sigctx_to_monoctx (sigctx, &ctx->ctx);
3029 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
3030 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
3031 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
3034 mono_thread_state_init (ctx);
3037 if (!ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] || !ctx->unwind_data [MONO_UNWIND_DATA_LMF])
3043 g_error ("Implement mono_arch_sigctx_to_monoctx for the current target");
3049 mono_thread_state_init (MonoThreadUnwindState *ctx)
3051 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
3053 #if defined(MONO_CROSS_COMPILE)
3054 ctx->valid = FALSE; //A cross compiler doesn't need to suspend.
3055 #elif MONO_ARCH_HAS_MONO_CONTEXT
3056 MONO_CONTEXT_GET_CURRENT (ctx->ctx);
3058 g_error ("Use a null sigctx requires a working mono-context");
3061 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
3062 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
3063 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread ? thread->jit_data : NULL;
3069 mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx)
3071 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
3078 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
3079 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
3080 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
3085 /*returns false if the thread is not attached*/
3087 mono_thread_state_init_from_current (MonoThreadUnwindState *ctx)
3089 MonoThreadInfo *thread = mono_thread_info_current_unchecked ();
3090 MONO_ARCH_CONTEXT_DEF
3092 mono_arch_flush_register_windows ();
3094 if (!thread || !thread->jit_data) {
3098 #ifdef MONO_INIT_CONTEXT_FROM_CURRENT
3099 MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx);
3101 MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current);
3104 ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get ();
3105 ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf ();
3106 ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data;
3112 mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx)
3114 mono_handle_exception (ctx, (MonoObject *)exc);
3115 mono_restore_context (ctx);
3118 /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */
3120 mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data)
3122 #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK
3123 MonoJitTlsData *jit_tls = (MonoJitTlsData *)mono_tls_get_jit_tls ();
3124 jit_tls->ex_ctx = *ctx;
3126 mono_arch_setup_async_callback (ctx, async_cb, user_data);
3128 g_error ("This target doesn't support mono_arch_setup_async_callback");
3133 * mono_restore_context:
3135 * Call the architecture specific restore context function.
3138 mono_restore_context (MonoContext *ctx)
3140 static void (*restore_context) (MonoContext *);
3142 if (!restore_context)
3143 restore_context = (void (*)(MonoContext *))mono_get_restore_context ();
3144 restore_context (ctx);
3145 g_assert_not_reached ();
3149 * mono_jinfo_get_unwind_info:
3151 * Return the unwind info for JI.
3154 mono_jinfo_get_unwind_info (MonoJitInfo *ji, guint32 *unwind_info_len)
3156 if (ji->has_unwind_info) {
3157 /* The address/length in the MonoJitInfo structure itself */
3158 MonoUnwindJitInfo *info = mono_jit_info_get_unwind_info (ji);
3159 *unwind_info_len = info->unw_info_len;
3160 return info->unw_info;
3161 } else if (ji->from_aot)
3162 return mono_aot_get_unwind_info (ji, unwind_info_len);
3164 return mono_get_cached_unwind_info (ji->unwind_info, unwind_info_len);
3168 mono_jinfo_get_epilog_size (MonoJitInfo *ji)
3170 MonoArchEHJitInfo *info;
3172 info = mono_jit_info_get_arch_eh_info (ji);
3175 return info->epilog_size;
3179 * LLVM/Bitcode exception handling.
3183 throw_exception (MonoObject *ex, gboolean rethrow)
3185 MONO_REQ_GC_UNSAFE_MODE;
3188 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3189 MonoException *mono_ex;
3191 if (!mono_object_isinst_checked (ex, mono_defaults.exception_class, &error)) {
3192 mono_error_assert_ok (&error);
3193 mono_ex = mono_get_exception_runtime_wrapped_checked (ex, &error);
3194 mono_error_assert_ok (&error);
3195 jit_tls->thrown_non_exc = mono_gchandle_new (ex, FALSE);
3198 mono_ex = (MonoException*)ex;
3201 jit_tls->thrown_exc = mono_gchandle_new ((MonoObject*)mono_ex, FALSE);
3204 #ifdef MONO_ARCH_HAVE_UNWIND_BACKTRACE
3205 GList *l, *ips = NULL;
3208 _Unwind_Backtrace (build_stack_trace, &ips);
3209 /* The list contains ip-gshared info pairs */
3211 ips = g_list_reverse (ips);
3212 for (l = ips; l; l = l->next) {
3213 trace = g_list_append (trace, l->data);
3214 trace = g_list_append (trace, NULL);
3216 MonoArray *ips_arr = mono_glist_to_array (trace, mono_defaults.int_class, &error);
3217 mono_error_assert_ok (&error);
3218 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
3220 g_list_free (trace);
3224 mono_llvm_cpp_throw_exception ();
3228 mono_llvm_throw_exception (MonoObject *ex)
3230 throw_exception (ex, FALSE);
3234 mono_llvm_rethrow_exception (MonoObject *ex)
3236 throw_exception (ex, TRUE);
3240 mono_llvm_raise_exception (MonoException *e)
3242 mono_llvm_throw_exception ((MonoObject*)e);
3246 mono_llvm_reraise_exception (MonoException *e)
3248 mono_llvm_rethrow_exception ((MonoObject*)e);
3252 mono_llvm_throw_corlib_exception (guint32 ex_token_index)
3254 guint32 ex_token = MONO_TOKEN_TYPE_DEF | ex_token_index;
3257 ex = mono_exception_from_token (mono_defaults.exception_class->image, ex_token);
3259 mono_llvm_throw_exception ((MonoObject*)ex);
3263 * mono_llvm_resume_exception:
3265 * Resume exception propagation.
3268 mono_llvm_resume_exception (void)
3270 mono_llvm_cpp_throw_exception ();
3274 * mono_llvm_load_exception:
3276 * Return the currently thrown exception.
3279 mono_llvm_load_exception (void)
3282 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3284 MonoException *mono_ex = (MonoException*)mono_gchandle_get_target (jit_tls->thrown_exc);
3286 if (mono_ex->trace_ips) {
3287 GList *trace_ips = NULL;
3288 gpointer ip = __builtin_return_address (0);
3290 size_t upper = mono_array_length (mono_ex->trace_ips);
3292 for (int i = 0; i < upper; i += TRACE_IP_ENTRY_SIZE) {
3293 gpointer curr_ip = mono_array_get (mono_ex->trace_ips, gpointer, i);
3294 for (int j = 0; j < TRACE_IP_ENTRY_SIZE; ++j) {
3295 gpointer p = mono_array_get (mono_ex->trace_ips, gpointer, i + j);
3296 trace_ips = g_list_append (trace_ips, p);
3302 // FIXME: Does this work correctly for rethrows?
3303 // We may be discarding useful information
3304 // when this gets GC'ed
3305 MonoArray *ips_arr = mono_glist_to_array (trace_ips, mono_defaults.int_class, &error);
3306 mono_error_assert_ok (&error);
3307 MONO_OBJECT_SETREF (mono_ex, trace_ips, ips_arr);
3308 g_list_free (trace_ips);
3311 //MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex));
3313 MONO_OBJECT_SETREF (mono_ex, trace_ips, mono_array_new_checked (mono_domain_get (), mono_defaults.int_class, 0, &error));
3314 mono_error_assert_ok (&error);
3315 MONO_OBJECT_SETREF (mono_ex, stack_trace, mono_array_new_checked (mono_domain_get (), mono_defaults.stack_frame_class, 0, &error));
3316 mono_error_assert_ok (&error);
3319 return &mono_ex->object;
3323 * mono_llvm_clear_exception:
3325 * Mark the currently thrown exception as handled.
3328 mono_llvm_clear_exception (void)
3330 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3331 mono_gchandle_free (jit_tls->thrown_exc);
3332 jit_tls->thrown_exc = 0;
3333 if (jit_tls->thrown_non_exc)
3334 mono_gchandle_free (jit_tls->thrown_non_exc);
3335 jit_tls->thrown_non_exc = 0;
3337 mono_memory_barrier ();
3341 * mono_llvm_match_exception:
3343 * Return the innermost clause containing REGION_START-REGION_END which can handle
3344 * the current exception.
3347 mono_llvm_match_exception (MonoJitInfo *jinfo, guint32 region_start, guint32 region_end, gpointer rgctx, MonoObject *this_obj)
3350 MonoJitTlsData *jit_tls = mono_get_jit_tls ();
3354 g_assert (jit_tls->thrown_exc);
3355 exc = mono_gchandle_get_target (jit_tls->thrown_exc);
3356 if (jit_tls->thrown_non_exc) {
3358 * Have to unwrap RuntimeWrappedExceptions if the
3359 * method's assembly doesn't have a RuntimeCompatibilityAttribute.
3361 if (!wrap_non_exception_throws (jinfo_get_method (jinfo)))
3362 exc = mono_gchandle_get_target (jit_tls->thrown_non_exc);
3365 for (int i = 0; i < jinfo->num_clauses; i++) {
3366 MonoJitExceptionInfo *ei = &jinfo->clauses [i];
3367 MonoClass *catch_class;
3369 if (! (ei->try_offset == region_start && ei->try_offset + ei->try_len == region_end) )
3372 catch_class = ei->data.catch_class;
3373 if (mono_class_is_open_constructed_type (&catch_class->byval_arg)) {
3374 MonoGenericContext context;
3375 MonoType *inflated_type;
3377 g_assert (rgctx || this_obj);
3378 context = get_generic_context_from_stack_frame (jinfo, rgctx ? rgctx : this_obj->vtable);
3379 inflated_type = mono_class_inflate_generic_type_checked (&catch_class->byval_arg, &context, &error);
3380 mono_error_assert_ok (&error); /* FIXME don't swallow the error */
3382 catch_class = mono_class_from_mono_type (inflated_type);
3383 mono_metadata_free_type (inflated_type);
3386 // FIXME: Handle edge cases handled in get_exception_catch_class
3387 if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst_checked (exc, catch_class, &error)) {
3388 index = ei->clause_index;
3391 mono_error_assert_ok (&error);
3393 if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) {
3394 g_assert_not_reached ();
3403 mono_debug_personality (int a, _Unwind_Action b,
3404 uint64_t c, struct _Unwind_Exception *d, struct _Unwind_Context *e)
3406 g_assert_not_reached ();
3410 mono_debug_personality (void);
3413 mono_debug_personality (void)
3415 g_assert_not_reached ();