/* * mini-exceptions.c: generic exception support * * Authors: * Dietmar Maurer (dietmar@ximian.com) * Mono Team (mono-list@lists.ximian.com) * * Copyright 2001-2003 Ximian, Inc. * Copyright 2003-2008 Novell, Inc. * Copyright 2011 Xamarin Inc (http://www.xamarin.com). */ #include #include #include #include #ifdef HAVE_EXECINFO_H #include #endif #ifdef HAVE_SYS_TYPES_H #include #endif #ifdef HAVE_SYS_WAIT_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #ifdef HAVE_SYS_SYSCALL_H #include #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mini.h" #include "trace.h" #include "debugger-agent.h" #ifndef MONO_ARCH_CONTEXT_DEF #define MONO_ARCH_CONTEXT_DEF #endif static gpointer restore_context_func, call_filter_func; static gpointer throw_exception_func, rethrow_exception_func; static gpointer throw_corlib_exception_func; static gpointer try_more_restore_tramp = NULL; static gpointer restore_stack_protection_tramp = NULL; static MonoUnhandledExceptionFunc unhandled_exception_hook = NULL; static gpointer unhandled_exception_hook_data = NULL; static void try_more_restore (void); static void restore_stack_protection (void); static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data); static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx); static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data); void mono_exceptions_init (void) { MonoRuntimeExceptionHandlingCallbacks cbs; if (mono_aot_only) { restore_context_func = mono_aot_get_trampoline ("restore_context"); call_filter_func = mono_aot_get_trampoline ("call_filter"); throw_exception_func = mono_aot_get_trampoline ("throw_exception"); rethrow_exception_func = mono_aot_get_trampoline ("rethrow_exception"); } else { MonoTrampInfo *info; restore_context_func = mono_arch_get_restore_context (&info, FALSE); mono_tramp_info_register (info); call_filter_func = mono_arch_get_call_filter (&info, FALSE); mono_tramp_info_register (info); throw_exception_func = mono_arch_get_throw_exception (&info, FALSE); mono_tramp_info_register (info); rethrow_exception_func = mono_arch_get_rethrow_exception (&info, FALSE); mono_tramp_info_register (info); } #ifdef MONO_ARCH_HAVE_RESTORE_STACK_SUPPORT try_more_restore_tramp = mono_create_specific_trampoline (try_more_restore, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL); restore_stack_protection_tramp = mono_create_specific_trampoline (restore_stack_protection, MONO_TRAMPOLINE_RESTORE_STACK_PROT, mono_domain_get (), NULL); #endif #ifdef MONO_ARCH_HAVE_EXCEPTIONS_INIT mono_arch_exceptions_init (); #endif cbs.mono_walk_stack_with_ctx = mono_runtime_walk_stack_with_ctx; cbs.mono_walk_stack_with_state = mono_walk_stack_with_state; cbs.mono_raise_exception = mono_get_throw_exception (); cbs.mono_raise_exception_with_ctx = mono_raise_exception_with_ctx; cbs.mono_exception_walk_trace = mono_exception_walk_trace; cbs.mono_install_handler_block_guard = mono_install_handler_block_guard; mono_install_eh_callbacks (&cbs); } gpointer mono_get_throw_exception (void) { g_assert (throw_exception_func); return throw_exception_func; } gpointer mono_get_rethrow_exception (void) { g_assert (rethrow_exception_func); return rethrow_exception_func; } gpointer mono_get_call_filter (void) { g_assert (call_filter_func); return call_filter_func; } gpointer mono_get_restore_context (void) { g_assert (restore_context_func); return restore_context_func; } gpointer mono_get_throw_corlib_exception (void) { gpointer code = NULL; MonoTrampInfo *info; /* This depends on corlib classes so cannot be inited in mono_exceptions_init () */ if (throw_corlib_exception_func) return throw_corlib_exception_func; if (mono_aot_only) code = mono_aot_get_trampoline ("throw_corlib_exception"); else { code = mono_arch_get_throw_corlib_exception (&info, FALSE); mono_tramp_info_register (info); } mono_memory_barrier (); throw_corlib_exception_func = code; return throw_corlib_exception_func; } static gboolean is_address_protected (MonoJitInfo *ji, MonoJitExceptionInfo *ei, gpointer ip) { MonoTryBlockHoleTableJitInfo *table; int i; guint32 offset; guint16 clause; if (ei->try_start > ip || ip >= ei->try_end) return FALSE; if (!ji->has_try_block_holes) return TRUE; table = mono_jit_info_get_try_block_hole_table_info (ji); offset = (guint32)((char*)ip - (char*)ji->code_start); clause = (guint16)(ei - ji->clauses); g_assert (clause < ji->num_clauses); for (i = 0; i < table->num_holes; ++i) { MonoTryBlockHoleJitInfo *hole = &table->holes [i]; if (hole->clause == clause && hole->offset <= offset && hole->offset + hole->length > offset) return FALSE; } return TRUE; } /* * find_jit_info: * * Translate between the mono_arch_find_jit_info function and the old API. */ static MonoJitInfo * find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx, MonoContext *new_ctx, MonoLMF **lmf, gboolean *managed) { StackFrameInfo frame; MonoJitInfo *ji; gboolean err; gpointer ip = MONO_CONTEXT_GET_IP (ctx); /* Avoid costly table lookup during stack overflow */ if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size))) ji = prev_ji; else ji = mini_jit_info_table_find (domain, ip, NULL); if (managed) *managed = FALSE; err = mono_arch_find_jit_info (domain, jit_tls, ji, ctx, new_ctx, lmf, NULL, &frame); if (!err) return (gpointer)-1; /* Convert between the new and the old APIs */ switch (frame.type) { case FRAME_TYPE_MANAGED: if (managed) *managed = TRUE; return frame.ji; case FRAME_TYPE_MANAGED_TO_NATIVE: if (frame.ji) return frame.ji; else { memset (res, 0, sizeof (MonoJitInfo)); res->d.method = frame.method; return res; } case FRAME_TYPE_DEBUGGER_INVOKE: { MonoContext tmp_ctx; /* * The normal exception handling code can't handle this frame, so just * skip it. */ ji = find_jit_info (domain, jit_tls, res, NULL, new_ctx, &tmp_ctx, lmf, managed); memcpy (new_ctx, &tmp_ctx, sizeof (MonoContext)); return ji; } default: g_assert_not_reached (); return NULL; } } /* mono_find_jit_info: * * This function is used to gather information from @ctx. It return the * MonoJitInfo of the corresponding function, unwinds one stack frame and * stores the resulting context into @new_ctx. It also stores a string * describing the stack location into @trace (if not NULL), and modifies * the @lmf if necessary. @native_offset return the IP offset from the * start of the function or -1 if that info is not available. */ MonoJitInfo * mono_find_jit_info (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *res, MonoJitInfo *prev_ji, MonoContext *ctx, MonoContext *new_ctx, char **trace, MonoLMF **lmf, int *native_offset, gboolean *managed) { gboolean managed2; gpointer ip = MONO_CONTEXT_GET_IP (ctx); MonoJitInfo *ji; MonoMethod *method = NULL; if (trace) *trace = NULL; if (native_offset) *native_offset = -1; if (managed) *managed = FALSE; ji = find_jit_info (domain, jit_tls, res, prev_ji, ctx, new_ctx, lmf, &managed2); if (ji == (gpointer)-1) return ji; if (ji) method = jinfo_get_method (ji); if (managed2 || (ji && method->wrapper_type)) { const char *real_ip, *start; gint32 offset; start = (const char *)ji->code_start; if (!managed2) /* ctx->ip points into native code */ real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx); else real_ip = (const char*)ip; if ((real_ip >= start) && (real_ip <= start + ji->code_size)) offset = real_ip - start; else offset = -1; if (native_offset) *native_offset = offset; if (managed) if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD) *managed = TRUE; if (trace) *trace = mono_debug_print_stack_frame (method, offset, domain); } else { if (trace) { char *fname = mono_method_full_name (jinfo_get_method (res), TRUE); *trace = g_strdup_printf ("in (unmanaged) %s", fname); g_free (fname); } } return ji; } /* * mono_find_jit_info_ext: * * A version of mono_find_jit_info which returns all data in the StackFrameInfo * structure. * A note about frames of type FRAME_TYPE_MANAGED_TO_NATIVE: * - These frames are used to mark managed-to-native transitions, so CTX will refer to native * code, and new_ctx will refer to the last managed frame. The caller should unwind once more * to obtain the last managed frame. * If SAVE_LOCATIONS is not NULL, it should point to an array of size MONO_MAX_IREGS. * On return, it will be filled with the locations where callee saved registers are saved * by the current frame. This is returned outside of StackFrameInfo because it can be * quite large on some platforms. * If ASYNC true, this function will be async safe, but some fields of frame and frame->ji will * not be set. */ gboolean mono_find_jit_info_ext (MonoDomain *domain, MonoJitTlsData *jit_tls, MonoJitInfo *prev_ji, MonoContext *ctx, MonoContext *new_ctx, char **trace, MonoLMF **lmf, mgreg_t **save_locations, StackFrameInfo *frame) { gboolean err; gpointer ip = MONO_CONTEXT_GET_IP (ctx); MonoJitInfo *ji; MonoDomain *target_domain = domain; MonoMethod *method = NULL; gboolean async = mono_thread_info_is_async_context (); if (trace) *trace = NULL; /* Avoid costly table lookup during stack overflow */ if (prev_ji && (ip > prev_ji->code_start && ((guint8*)ip < ((guint8*)prev_ji->code_start) + prev_ji->code_size))) ji = prev_ji; else ji = mini_jit_info_table_find (domain, ip, &target_domain); if (!target_domain) target_domain = domain; if (save_locations) memset (save_locations, 0, MONO_MAX_IREGS * sizeof (mgreg_t*)); err = mono_arch_find_jit_info (target_domain, jit_tls, ji, ctx, new_ctx, lmf, save_locations, frame); if (!err) return FALSE; if (frame->ji && !frame->ji->async) method = jinfo_get_method (frame->ji); if (frame->type == FRAME_TYPE_MANAGED && method) { if (!method->wrapper_type || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD) frame->managed = TRUE; } if (frame->type == FRAME_TYPE_MANAGED_TO_NATIVE) { /* * This type of frame is just a marker, the caller should unwind once more to get the * last managed frame. */ frame->ji = NULL; frame->method = NULL; } frame->native_offset = -1; frame->domain = target_domain; frame->async_context = async; ji = frame->ji; if (frame->type == FRAME_TYPE_MANAGED) frame->method = method; if (ji && (frame->managed || (method && method->wrapper_type))) { const char *real_ip, *start; start = (const char *)ji->code_start; if (!frame->managed) /* ctx->ip points into native code */ real_ip = (const char*)MONO_CONTEXT_GET_IP (new_ctx); else real_ip = (const char*)ip; if ((real_ip >= start) && (real_ip <= start + ji->code_size)) frame->native_offset = real_ip - start; else frame->native_offset = -1; if (trace) *trace = mono_debug_print_stack_frame (method, frame->native_offset, domain); } else { if (trace && frame->method) { char *fname = mono_method_full_name (frame->method, TRUE); *trace = g_strdup_printf ("in (unmanaged) %s", fname); g_free (fname); } } return TRUE; } static gpointer get_generic_info_from_stack_frame (MonoJitInfo *ji, MonoContext *ctx) { MonoGenericJitInfo *gi; MonoMethod *method; gpointer info; if (!ji->has_generic_jit_info) return NULL; gi = mono_jit_info_get_generic_jit_info (ji); if (!gi->has_this) return NULL; info = NULL; /* * Search location list if available, it contains the precise location of the * argument for every pc offset, even if the method was interrupted while it was in * its prolog. */ if (gi->nlocs) { int offset = (mgreg_t)MONO_CONTEXT_GET_IP (ctx) - (mgreg_t)ji->code_start; int i; for (i = 0; i < gi->nlocs; ++i) { MonoDwarfLocListEntry *entry = &gi->locations [i]; if (offset >= entry->from && (offset < entry->to || entry->to == 0)) { if (entry->is_reg) info = (gpointer)mono_arch_context_get_int_reg (ctx, entry->reg); else info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, entry->reg) + entry->offset); break; } } g_assert (i < gi->nlocs); } else { if (gi->this_in_reg) info = (gpointer)mono_arch_context_get_int_reg (ctx, gi->this_reg); else info = *(gpointer*)(gpointer)((char*)mono_arch_context_get_int_reg (ctx, gi->this_reg) + gi->this_offset); } method = jinfo_get_method (ji); if (mono_method_get_context (method)->method_inst) { return info; } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) { return info; } else { /* Avoid returning a managed object */ MonoObject *this_obj = info; return this_obj->vtable->klass; } } static MonoGenericContext get_generic_context_from_stack_frame (MonoJitInfo *ji, gpointer generic_info) { MonoGenericContext context = { NULL, NULL }; MonoClass *class, *method_container_class; MonoMethod *method; g_assert (generic_info); method = jinfo_get_method (ji); g_assert (method->is_inflated); if (mono_method_get_context (method)->method_inst) { MonoMethodRuntimeGenericContext *mrgctx = generic_info; class = mrgctx->class_vtable->klass; context.method_inst = mrgctx->method_inst; g_assert (context.method_inst); } else if ((method->flags & METHOD_ATTRIBUTE_STATIC) || method->klass->valuetype) { MonoVTable *vtable = generic_info; class = vtable->klass; } else { class = generic_info; } //g_assert (!method->klass->generic_container); if (method->klass->generic_class) method_container_class = method->klass->generic_class->container_class; else method_container_class = method->klass; /* class might refer to a subclass of method's class */ while (!(class == method->klass || (class->generic_class && class->generic_class->container_class == method_container_class))) { class = class->parent; g_assert (class); } if (class->generic_class || class->generic_container) context.class_inst = mini_class_get_context (class)->class_inst; if (class->generic_class) g_assert (mono_class_has_parent_and_ignore_generics (class->generic_class->container_class, method_container_class)); else g_assert (mono_class_has_parent_and_ignore_generics (class, method_container_class)); return context; } static MonoMethod* get_method_from_stack_frame (MonoJitInfo *ji, gpointer generic_info) { MonoGenericContext context; MonoMethod *method; if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this) return jinfo_get_method (ji); context = get_generic_context_from_stack_frame (ji, generic_info); method = jinfo_get_method (ji); method = mono_method_get_declaring_generic_method (method); method = mono_class_inflate_generic_method (method, &context); return method; } /** * mono_exception_walk_native_trace: * @ex: The exception object whose frames should be walked * @func: callback to call for each stack frame * @user_data: data passed to the callback * * This function walks the stacktrace of an exception. For * each frame the callback function is called with the relevant info. * The walk ends when no more stack frames are found or when the callback * returns a TRUE value. */ gboolean mono_exception_walk_trace (MonoException *ex, MonoExceptionFrameWalk func, gpointer user_data) { MonoDomain *domain = mono_domain_get (); MonoArray *ta = ex->trace_ips; int len, i; if (ta == NULL) return FALSE; len = mono_array_length (ta) >> 1; for (i = 0; i < len; i++) { gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0); gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1); MonoJitInfo *ji = mono_jit_info_table_find (domain, ip); if (ji == NULL) { if (func (NULL, ip, 0, FALSE, user_data)) return TRUE; } else { MonoMethod *method = get_method_from_stack_frame (ji, generic_info); if (func (method, ji->code_start, (char *) ip - (char *) ji->code_start, TRUE, user_data)) return TRUE; } } return len > 0; } MonoString * ves_icall_System_Exception_get_trace (MonoException *ex) { MonoDomain *domain = mono_domain_get (); MonoString *res; MonoArray *ta = ex->trace_ips; int i, len; GString *trace_str; if (ta == NULL) /* Exception is not thrown yet */ return NULL; len = mono_array_length (ta) >> 1; trace_str = g_string_new (""); for (i = 0; i < len; i++) { MonoJitInfo *ji; gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0); gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1); ji = mono_jit_info_table_find (domain, ip); if (ji == NULL) { /* Unmanaged frame */ g_string_append_printf (trace_str, "in (unmanaged) %p\n", ip); } else { gchar *location; gint32 address; MonoMethod *method = get_method_from_stack_frame (ji, generic_info); address = (char *)ip - (char *)ji->code_start; location = mono_debug_print_stack_frame ( method, address, ex->object.vtable->domain); g_string_append_printf (trace_str, "%s\n", location); g_free (location); } } res = mono_string_new (ex->object.vtable->domain, trace_str->str); g_string_free (trace_str, TRUE); return res; } MonoArray * ves_icall_get_trace (MonoException *exc, gint32 skip, MonoBoolean need_file_info) { MonoDomain *domain = mono_domain_get (); MonoArray *res; MonoArray *ta = exc->trace_ips; MonoDebugSourceLocation *location; int i, len; if (ta == NULL) { /* Exception is not thrown yet */ return mono_array_new (domain, mono_defaults.stack_frame_class, 0); } len = mono_array_length (ta) >> 1; res = mono_array_new (domain, mono_defaults.stack_frame_class, len > skip ? len - skip : 0); for (i = skip; i < len; i++) { MonoJitInfo *ji; MonoStackFrame *sf = (MonoStackFrame *)mono_object_new (domain, mono_defaults.stack_frame_class); gpointer ip = mono_array_get (ta, gpointer, i * 2 + 0); gpointer generic_info = mono_array_get (ta, gpointer, i * 2 + 1); MonoMethod *method; ji = mono_jit_info_table_find (domain, ip); if (ji == NULL) { /* Unmanaged frame */ mono_array_setref (res, i, sf); continue; } g_assert (ji != NULL); method = get_method_from_stack_frame (ji, generic_info); if (jinfo_get_method (ji)->wrapper_type) { char *s; sf->method = NULL; s = mono_method_full_name (method, TRUE); MONO_OBJECT_SETREF (sf, internal_method_name, mono_string_new (domain, s)); g_free (s); } else MONO_OBJECT_SETREF (sf, method, mono_method_get_object (domain, method, NULL)); sf->native_offset = (char *)ip - (char *)ji->code_start; /* * mono_debug_lookup_source_location() returns both the file / line number information * and the IL offset. Note that computing the IL offset is already an expensive * operation, so we shouldn't call this method twice. */ location = mono_debug_lookup_source_location (jinfo_get_method (ji), sf->native_offset, domain); if (location) sf->il_offset = location->il_offset; else sf->il_offset = 0; if (need_file_info) { if (location && location->source_file) { MONO_OBJECT_SETREF (sf, filename, mono_string_new (domain, location->source_file)); sf->line = location->row; sf->column = location->column; } else { sf->line = sf->column = 0; sf->filename = NULL; } } mono_debug_free_source_location (location); mono_array_setref (res, i, sf); } return res; } static void mono_runtime_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data) { if (!start_ctx) { MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); if (jit_tls && jit_tls->orig_ex_ctx_set) start_ctx = &jit_tls->orig_ex_ctx; } mono_walk_stack_with_ctx (func, start_ctx, unwind_options, user_data); } /** * mono_walk_stack_with_ctx: * * Unwind the current thread starting at @start_ctx. * * If @start_ctx is null, we capture the current context. */ void mono_walk_stack_with_ctx (MonoJitStackWalk func, MonoContext *start_ctx, MonoUnwindOptions unwind_options, void *user_data) { MonoContext extra_ctx; MonoInternalThread *thread = mono_thread_internal_current (); MONO_ARCH_CONTEXT_DEF if (!thread || !thread->jit_data) return; if (!start_ctx) { mono_arch_flush_register_windows (); #ifdef MONO_INIT_CONTEXT_FROM_CURRENT MONO_INIT_CONTEXT_FROM_CURRENT (&extra_ctx); #else MONO_INIT_CONTEXT_FROM_FUNC (&extra_ctx, mono_walk_stack_with_ctx); #endif start_ctx = &extra_ctx; } mono_walk_stack_full (func, start_ctx, mono_domain_get (), thread->jit_data, mono_get_lmf (), unwind_options, user_data); } /** * mono_walk_stack_with_state: * * Unwind a thread described by @state. * * State must be valid (state->valid == TRUE). * * If you are using this function to unwind another thread, make sure it is suspended. * * If @state is null, we capture the current context. */ void mono_walk_stack_with_state (MonoJitStackWalk func, MonoThreadUnwindState *state, MonoUnwindOptions unwind_options, void *user_data) { MonoThreadUnwindState extra_state; if (!state) { g_assert (!mono_thread_info_is_async_context ()); if (!mono_thread_state_init_from_current (&extra_state)) return; state = &extra_state; } g_assert (state->valid); mono_walk_stack_full (func, &state->ctx, state->unwind_data [MONO_UNWIND_DATA_DOMAIN], state->unwind_data [MONO_UNWIND_DATA_JIT_TLS], state->unwind_data [MONO_UNWIND_DATA_LMF], unwind_options, user_data); } void mono_walk_stack (MonoJitStackWalk func, MonoUnwindOptions options, void *user_data) { MonoThreadUnwindState state; if (!mono_thread_state_init_from_current (&state)) return; mono_walk_stack_with_state (func, &state, options, user_data); } /** * mono_walk_stack_full: * @func: callback to call for each stack frame * @domain: starting appdomain, can be NULL to use the current domain * @unwind_options: what extra information the unwinder should gather * @start_ctx: starting state of the stack walk, can be NULL. * @thread: the thread whose stack to walk, can be NULL to use the current thread * @lmf: the LMF of @thread, can be NULL to use the LMF of the current thread * @user_data: data passed to the callback * * This function walks the stack of a thread, starting from the state * represented by start_ctx. For each frame the callback * function is called with the relevant info. The walk ends when no more * managed stack frames are found or when the callback returns a TRUE value. */ static void mono_walk_stack_full (MonoJitStackWalk func, MonoContext *start_ctx, MonoDomain *domain, MonoJitTlsData *jit_tls, MonoLMF *lmf, MonoUnwindOptions unwind_options, gpointer user_data) { gint il_offset, i; MonoContext ctx, new_ctx; StackFrameInfo frame; gboolean res; mgreg_t *reg_locations [MONO_MAX_IREGS]; mgreg_t *new_reg_locations [MONO_MAX_IREGS]; gboolean get_reg_locations = unwind_options & MONO_UNWIND_REG_LOCATIONS; gboolean async = mono_thread_info_is_async_context (); g_assert (start_ctx); g_assert (domain); g_assert (jit_tls); /*The LMF will be null if the target have no managed frames.*/ /* g_assert (lmf); */ if (async) g_assert (unwind_options == MONO_UNWIND_NONE); memcpy (&ctx, start_ctx, sizeof (MonoContext)); memset (reg_locations, 0, sizeof (reg_locations)); while (MONO_CONTEXT_GET_SP (&ctx) < jit_tls->end_of_stack) { frame.lmf = lmf; res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, get_reg_locations ? new_reg_locations : NULL, &frame); if (!res) return; if ((unwind_options & MONO_UNWIND_LOOKUP_IL_OFFSET) && frame.ji) { MonoDebugSourceLocation *source; source = mono_debug_lookup_source_location (jinfo_get_method (frame.ji), frame.native_offset, domain); il_offset = source ? source->il_offset : -1; mono_debug_free_source_location (source); } else il_offset = -1; frame.il_offset = il_offset; if ((unwind_options & MONO_UNWIND_LOOKUP_ACTUAL_METHOD) && frame.ji) { frame.actual_method = get_method_from_stack_frame (frame.ji, get_generic_info_from_stack_frame (frame.ji, &ctx)); } else { frame.actual_method = frame.method; } if (get_reg_locations) frame.reg_locations = reg_locations; if (func (&frame, &ctx, user_data)) return; if (get_reg_locations) { for (i = 0; i < MONO_MAX_IREGS; ++i) if (new_reg_locations [i]) reg_locations [i] = new_reg_locations [i]; } ctx = new_ctx; } } MonoBoolean ves_icall_get_frame_info (gint32 skip, MonoBoolean need_file_info, MonoReflectionMethod **method, gint32 *iloffset, gint32 *native_offset, MonoString **file, gint32 *line, gint32 *column) { MonoDomain *domain = mono_domain_get (); MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoLMF *lmf = mono_get_lmf (); MonoJitInfo *ji = NULL; MonoContext ctx, new_ctx; MonoDebugSourceLocation *location; MonoMethod *jmethod = NULL, *actual_method; StackFrameInfo frame; gboolean res; MONO_ARCH_CONTEXT_DEF; mono_arch_flush_register_windows (); #ifdef MONO_INIT_CONTEXT_FROM_CURRENT MONO_INIT_CONTEXT_FROM_CURRENT (&ctx); #else MONO_INIT_CONTEXT_FROM_FUNC (&ctx, ves_icall_get_frame_info); #endif new_ctx = ctx; do { ctx = new_ctx; res = mono_find_jit_info_ext (domain, jit_tls, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, &frame); if (!res) return FALSE; if (frame.type == FRAME_TYPE_MANAGED_TO_NATIVE || frame.type == FRAME_TYPE_DEBUGGER_INVOKE) continue; ji = frame.ji; *native_offset = frame.native_offset; /* The skip count passed by the caller depends on us not filtering out MANAGED_TO_NATIVE */ jmethod = jinfo_get_method (ji); if (jmethod->wrapper_type != MONO_WRAPPER_NONE && jmethod->wrapper_type != MONO_WRAPPER_DYNAMIC_METHOD && jmethod->wrapper_type != MONO_WRAPPER_MANAGED_TO_NATIVE) continue; skip--; } while (skip >= 0); actual_method = get_method_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, &ctx)); mono_gc_wbarrier_generic_store (method, (MonoObject*) mono_method_get_object (domain, actual_method, NULL)); location = mono_debug_lookup_source_location (jmethod, *native_offset, domain); if (location) *iloffset = location->il_offset; else *iloffset = 0; if (need_file_info) { if (location) { mono_gc_wbarrier_generic_store (file, (MonoObject*) mono_string_new (domain, location->source_file)); *line = location->row; *column = location->column; } else { *file = NULL; *line = *column = 0; } } mono_debug_free_source_location (location); return TRUE; } typedef struct { guint32 skips; MonoSecurityFrame *frame; } MonoFrameSecurityInfo; static gboolean callback_get_first_frame_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { MonoFrameSecurityInfo *si = (MonoFrameSecurityInfo*) data; MonoJitInfo *ji = frame->ji; MonoMethod *method; if (!ji) return FALSE; /* FIXME: skip all wrappers ?? probably not - case by case testing is required */ method = jinfo_get_method (ji); if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE || method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE || method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH || method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK || method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) { return FALSE; } if (si->skips > 0) { si->skips--; return FALSE; } si->frame = mono_declsec_create_frame (frame->domain, ji); /* Stop - we only want the first frame (e.g. LinkDemand and InheritanceDemand) */ return TRUE; } /** * ves_icall_System_Security_SecurityFrame_GetSecurityFrame: * @skip: the number of stack frames to skip * * This function returns a the security informations of a single stack frame * (after the skipped ones). This is required for [NonCas]LinkDemand[Choice] * and [NonCas]InheritanceDemand[Choice] as only the caller security is * evaluated. */ MonoSecurityFrame* ves_icall_System_Security_SecurityFrame_GetSecurityFrame (gint32 skip) { MonoFrameSecurityInfo si; si.skips = skip; si.frame = NULL; mono_walk_stack (callback_get_first_frame_security_info, MONO_UNWIND_DEFAULT, &si); return (si.skips == 0) ? si.frame : NULL; } typedef struct { guint32 skips; MonoArray *stack; guint32 count; guint32 maximum; } MonoSecurityStack; static void grow_array (MonoSecurityStack *stack) { MonoDomain *domain = mono_domain_get (); guint32 newsize = (stack->maximum << 1); MonoArray *newstack = mono_array_new (domain, mono_defaults.runtimesecurityframe_class, newsize); int i; for (i=0; i < stack->maximum; i++) { gpointer frame = mono_array_get (stack->stack, gpointer, i); mono_array_setref (newstack, i, frame); } stack->maximum = newsize; stack->stack = newstack; } static gboolean callback_get_stack_frames_security_info (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { MonoSecurityStack *ss = (MonoSecurityStack*) data; MonoJitInfo *ji = frame->ji; MonoMethod *method; if (!ji) return FALSE; /* FIXME: skip all wrappers ?? probably not - case by case testing is required */ method = jinfo_get_method (ji); if (method->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE || method->wrapper_type == MONO_WRAPPER_XDOMAIN_INVOKE || method->wrapper_type == MONO_WRAPPER_XDOMAIN_DISPATCH || method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE_WITH_CHECK || method->wrapper_type == MONO_WRAPPER_REMOTING_INVOKE) { return FALSE; } if (ss->skips > 0) { ss->skips--; return FALSE; } if (ss->count == ss->maximum) grow_array (ss); mono_array_setref (ss->stack, ss->count++, mono_declsec_create_frame (frame->domain, ji)); /* continue down the stack */ return FALSE; } static MonoArray * glist_to_array (GList *list, MonoClass *eclass) { MonoDomain *domain = mono_domain_get (); MonoArray *res; int len, i; if (!list) return NULL; len = g_list_length (list); res = mono_array_new (domain, eclass, len); for (i = 0; list; list = list->next, i++) mono_array_set (res, gpointer, i, list->data); return res; } /** * ves_icall_System_Security_SecurityFrame_GetSecurityStack: * @skip: the number of stack frames to skip * * This function returns an managed array of containing the security * informations for each frame (after the skipped ones). This is used for * [NonCas]Demand[Choice] where the complete evaluation of the stack is * required. */ MonoArray* ves_icall_System_Security_SecurityFrame_GetSecurityStack (gint32 skip) { MonoSecurityStack ss; #if defined(__ia64__) || defined(__s390__) || defined(__s390x__) skip--; #endif ss.skips = skip; ss.count = 0; ss.maximum = MONO_CAS_INITIAL_STACK_SIZE; ss.stack = mono_array_new (mono_domain_get (), mono_defaults.runtimesecurityframe_class, ss.maximum); mono_walk_stack (callback_get_stack_frames_security_info, MONO_UNWIND_DEFAULT, &ss); /* g_warning ("STACK RESULT: %d out of %d", ss.count, ss.maximum); */ return ss.stack; } static MonoClass* get_exception_catch_class (MonoJitExceptionInfo *ei, MonoJitInfo *ji, MonoContext *ctx) { MonoClass *catch_class = ei->data.catch_class; MonoType *inflated_type; MonoGenericContext context; /*MonoJitExceptionInfo::data is an union used by filter and finally clauses too.*/ if (!catch_class || ei->flags != MONO_EXCEPTION_CLAUSE_NONE) return NULL; if (!ji->has_generic_jit_info || !mono_jit_info_get_generic_jit_info (ji)->has_this) return catch_class; context = get_generic_context_from_stack_frame (ji, get_generic_info_from_stack_frame (ji, ctx)); /* FIXME: we shouldn't inflate but instead put the type in the rgctx and fetch it from there. It might be a good idea to do this lazily, i.e. only when the exception is actually thrown, so as not to waste space for exception clauses which might never be encountered. */ inflated_type = mono_class_inflate_generic_type (&catch_class->byval_arg, &context); catch_class = mono_class_from_mono_type (inflated_type); mono_metadata_free_type (inflated_type); return catch_class; } /* * mini_jit_info_table_find: * * Same as mono_jit_info_table_find, but search all the domains of the current thread * if ADDR is not found in DOMAIN. The domain where the method was found is stored into * OUT_DOMAIN if it is not NULL. */ MonoJitInfo* mini_jit_info_table_find (MonoDomain *domain, char *addr, MonoDomain **out_domain) { MonoJitInfo *ji; MonoInternalThread *t = mono_thread_internal_current (); gpointer *refs; if (out_domain) *out_domain = NULL; ji = mono_jit_info_table_find (domain, addr); if (ji) { if (out_domain) *out_domain = domain; return ji; } /* maybe it is shared code, so we also search in the root domain */ if (domain != mono_get_root_domain ()) { ji = mono_jit_info_table_find (mono_get_root_domain (), addr); if (ji) { if (out_domain) *out_domain = mono_get_root_domain (); return ji; } } if (!t) return NULL; refs = (t->appdomain_refs) ? *(gpointer *) t->appdomain_refs : NULL; for (; refs && *refs; refs++) { if (*refs != domain && *refs != mono_get_root_domain ()) { ji = mono_jit_info_table_find ((MonoDomain*) *refs, addr); if (ji) { if (out_domain) *out_domain = (MonoDomain*) *refs; return ji; } } } return NULL; } /* * wrap_non_exception_throws: * * Determine whenever M's assembly has a RuntimeCompatibilityAttribute with the * WrapNonExceptionThrows flag set. */ static gboolean wrap_non_exception_throws (MonoMethod *m) { MonoAssembly *ass = m->klass->image->assembly; MonoCustomAttrInfo* attrs; static MonoClass *klass; int i; gboolean val = FALSE; g_assert (ass); if (ass->wrap_non_exception_throws_inited) return ass->wrap_non_exception_throws; klass = mono_class_from_name_cached (mono_defaults.corlib, "System.Runtime.CompilerServices", "RuntimeCompatibilityAttribute"); attrs = mono_custom_attrs_from_assembly (ass); if (attrs) { for (i = 0; i < attrs->num_attrs; ++i) { MonoCustomAttrEntry *attr = &attrs->attrs [i]; const gchar *p; int len, num_named, named_type, data_type, name_len; char *name; if (!attr->ctor || attr->ctor->klass != klass) continue; /* Decode the RuntimeCompatibilityAttribute. See reflection.c */ len = attr->data_size; p = (const char*)attr->data; g_assert (read16 (p) == 0x0001); p += 2; num_named = read16 (p); if (num_named != 1) continue; p += 2; named_type = *p; p ++; data_type = *p; p ++; /* Property */ if (named_type != 0x54) continue; name_len = mono_metadata_decode_blob_size (p, &p); name = g_malloc (name_len + 1); memcpy (name, p, name_len); name [name_len] = 0; p += name_len; g_assert (!strcmp (name, "WrapNonExceptionThrows")); g_free (name); /* The value is a BOOLEAN */ val = *p; } mono_custom_attrs_free (attrs); } ass->wrap_non_exception_throws = val; mono_memory_barrier (); ass->wrap_non_exception_throws_inited = TRUE; return val; } #ifndef MONO_ARCH_STACK_GROWS_UP #define DOES_STACK_GROWS_UP 1 #else #define DOES_STACK_GROWS_UP 0 #endif #define MAX_UNMANAGED_BACKTRACE 128 static MonoArray* build_native_trace (void) { /* This puppy only makes sense on mobile, IOW, ARM. */ #if defined (HAVE_BACKTRACE_SYMBOLS) && defined (TARGET_ARM) MonoArray *res; void *native_trace [MAX_UNMANAGED_BACKTRACE]; int size = backtrace (native_trace, MAX_UNMANAGED_BACKTRACE); int i; if (!size) return NULL; res = mono_array_new (mono_domain_get (), mono_defaults.int_class, size); for (i = 0; i < size; i++) mono_array_set (res, gpointer, i, native_trace [i]); return res; #else return NULL; #endif } #define setup_managed_stacktrace_information() do { \ if (mono_ex && !initial_trace_ips) { \ trace_ips = g_list_reverse (trace_ips); \ MONO_OBJECT_SETREF (mono_ex, trace_ips, glist_to_array (trace_ips, mono_defaults.int_class)); \ MONO_OBJECT_SETREF (mono_ex, native_trace_ips, build_native_trace ()); \ if (has_dynamic_methods) \ /* These methods could go away anytime, so compute the stack trace now */ \ MONO_OBJECT_SETREF (mono_ex, stack_trace, ves_icall_System_Exception_get_trace (mono_ex)); \ } \ g_list_free (trace_ips); \ trace_ips = NULL; \ } while (0) /* * mono_handle_exception_internal_first_pass: * * The first pass of exception handling. Unwind the stack until a catch clause which can catch * OBJ is found. Run the index of the filter clause which caught the exception into * OUT_FILTER_IDX. Return TRUE if the exception is caught, FALSE otherwise. */ static gboolean mono_handle_exception_internal_first_pass (MonoContext *ctx, gpointer obj, gint32 *out_filter_idx, MonoJitInfo **out_ji, MonoJitInfo **out_prev_ji, MonoObject *non_exception) { MonoDomain *domain = mono_domain_get (); MonoJitInfo *ji = NULL; static int (*call_filter) (MonoContext *, gpointer) = NULL; MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoLMF *lmf = mono_get_lmf (); MonoArray *initial_trace_ips = NULL; GList *trace_ips = NULL; MonoException *mono_ex; gboolean stack_overflow = FALSE; MonoContext initial_ctx; MonoMethod *method; int frame_count = 0; gboolean has_dynamic_methods = FALSE; gint32 filter_idx; int i; MonoObject *ex_obj; g_assert (ctx != NULL); if (obj == domain->stack_overflow_ex) stack_overflow = TRUE; mono_ex = (MonoException*)obj; initial_trace_ips = mono_ex->trace_ips; if (mono_object_isinst (obj, mono_defaults.exception_class)) { mono_ex = (MonoException*)obj; initial_trace_ips = mono_ex->trace_ips; } else { mono_ex = NULL; } if (!call_filter) call_filter = mono_get_call_filter (); g_assert (jit_tls->end_of_stack); g_assert (jit_tls->abort_func); if (out_filter_idx) *out_filter_idx = -1; if (out_ji) *out_ji = NULL; if (out_prev_ji) *out_prev_ji = NULL; filter_idx = 0; initial_ctx = *ctx; while (1) { MonoContext new_ctx; guint32 free_stack; int clause_index_start = 0; gboolean unwind_res = TRUE; StackFrameInfo frame; if (out_prev_ji) *out_prev_ji = ji; unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame); if (unwind_res) { if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) { *ctx = new_ctx; continue; } g_assert (frame.type == FRAME_TYPE_MANAGED); ji = frame.ji; } if (!unwind_res) { setup_managed_stacktrace_information (); return FALSE; } frame_count ++; method = jinfo_get_method (ji); //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count); if (mini_get_debug_options ()->reverse_pinvoke_exceptions && method->wrapper_type == MONO_WRAPPER_NATIVE_TO_MANAGED) { g_error ("A native frame was found while unwinding the stack after an exception.\n" "The native frame called the managed method:\n%s\n", mono_method_full_name (method, TRUE)); } if (method->wrapper_type != MONO_WRAPPER_RUNTIME_INVOKE && mono_ex) { /* * Avoid overwriting the stack trace if the exception is * rethrown. Also avoid giant stack traces during a stack * overflow. */ if (!initial_trace_ips && (frame_count < 1000)) { trace_ips = g_list_prepend (trace_ips, MONO_CONTEXT_GET_IP (ctx)); trace_ips = g_list_prepend (trace_ips, get_generic_info_from_stack_frame (ji, ctx)); } } if (method->dynamic) has_dynamic_methods = TRUE; if (stack_overflow) { if (DOES_STACK_GROWS_UP) free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)); else free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx)); } else { free_stack = 0xffffff; } for (i = clause_index_start; i < ji->num_clauses; i++) { MonoJitExceptionInfo *ei = &ji->clauses [i]; gboolean filtered = FALSE; /* * During stack overflow, wait till the unwinding frees some stack * space before running handlers/finalizers. */ if (free_stack <= (64 * 1024)) continue; if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) { /* catch block */ MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx); /* * Have to unwrap RuntimeWrappedExceptions if the * method's assembly doesn't have a RuntimeCompatibilityAttribute. */ if (non_exception && !wrap_non_exception_throws (method)) ex_obj = non_exception; else ex_obj = obj; if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) { gboolean is_user_frame = method->wrapper_type == MONO_WRAPPER_NONE || method->wrapper_type == MONO_WRAPPER_DYNAMIC_METHOD; #ifndef DISABLE_PERFCOUNTERS mono_perfcounters->exceptions_filters++; #endif /* Here's the thing, if this is a filter clause done by a wrapper like runtime invoke, we don't want to trim the stackframe since if it returns FALSE we lose information. FIXME Not 100% sure if it's a good idea even with user clauses. */ if (is_user_frame) setup_managed_stacktrace_information (); if (ji->from_llvm) { #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj); #else g_assert_not_reached (); #endif } else { /* store the exception object in bp + ei->exvar_offset */ *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj; } mono_debugger_agent_begin_exception_filter (mono_ex, ctx, &initial_ctx); filtered = call_filter (ctx, ei->data.filter); mono_debugger_agent_end_exception_filter (mono_ex, ctx, &initial_ctx); if (filtered && out_filter_idx) *out_filter_idx = filter_idx; if (out_ji) *out_ji = ji; filter_idx ++; if (filtered) { if (!is_user_frame) setup_managed_stacktrace_information (); /* mono_debugger_agent_handle_exception () needs this */ MONO_CONTEXT_SET_IP (ctx, ei->handler_start); return TRUE; } } if (ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) { setup_managed_stacktrace_information (); if (out_ji) *out_ji = ji; /* mono_debugger_agent_handle_exception () needs this */ MONO_CONTEXT_SET_IP (ctx, ei->handler_start); return TRUE; } } } *ctx = new_ctx; } g_assert_not_reached (); } /** * mono_handle_exception_internal: * @ctx: saved processor state * @obj: the exception object * @resume: whenever to resume unwinding based on the state in MonoJitTlsData. */ static gboolean mono_handle_exception_internal (MonoContext *ctx, gpointer obj, gboolean resume, MonoJitInfo **out_ji) { MonoDomain *domain = mono_domain_get (); MonoJitInfo *ji, *prev_ji; static int (*call_filter) (MonoContext *, gpointer) = NULL; MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoLMF *lmf = mono_get_lmf (); MonoException *mono_ex; gboolean stack_overflow = FALSE; MonoContext initial_ctx; MonoMethod *method; int frame_count = 0; gint32 filter_idx, first_filter_idx = 0; int i; MonoObject *ex_obj; MonoObject *non_exception = NULL; g_assert (ctx != NULL); if (!obj) { MonoException *ex = mono_get_exception_null_reference (); MONO_OBJECT_SETREF (ex, message, mono_string_new (domain, "Object reference not set to an instance of an object")); obj = (MonoObject *)ex; } /* * Allocate a new exception object instead of the preconstructed ones. */ if (obj == domain->stack_overflow_ex) { /* * It is not a good idea to try and put even more pressure on the little stack available. * obj = mono_get_exception_stack_overflow (); */ stack_overflow = TRUE; } else if (obj == domain->null_reference_ex) { obj = mono_get_exception_null_reference (); } if (!mono_object_isinst (obj, mono_defaults.exception_class)) { non_exception = obj; obj = mono_get_exception_runtime_wrapped (obj); } mono_ex = (MonoException*)obj; if (mono_object_isinst (obj, mono_defaults.exception_class)) { mono_ex = (MonoException*)obj; } else { mono_ex = NULL; } if (mono_ex && jit_tls->class_cast_from) { if (!strcmp (mono_ex->object.vtable->klass->name, "InvalidCastException")) { char *from_name = mono_type_get_full_name (jit_tls->class_cast_from); char *to_name = mono_type_get_full_name (jit_tls->class_cast_to); char *msg = g_strdup_printf ("Unable to cast object of type '%s' to type '%s'.", from_name, to_name); mono_ex->message = mono_string_new (domain, msg); g_free (from_name); g_free (to_name); g_free (msg); } if (!strcmp (mono_ex->object.vtable->klass->name, "ArrayTypeMismatchException")) { char *from_name = mono_type_get_full_name (jit_tls->class_cast_from); char *to_name = mono_type_get_full_name (jit_tls->class_cast_to); char *msg = g_strdup_printf ("Source array of type '%s' cannot be cast to destination array type '%s'.", from_name, to_name); mono_ex->message = mono_string_new (domain, msg); g_free (from_name); g_free (to_name); g_free (msg); } } if (!call_filter) call_filter = mono_get_call_filter (); g_assert (jit_tls->end_of_stack); g_assert (jit_tls->abort_func); /* * We set orig_ex_ctx_set to TRUE/FALSE around profiler calls to make sure it doesn't * end up being TRUE on any code path. */ memcpy (&jit_tls->orig_ex_ctx, ctx, sizeof (MonoContext)); if (!resume) { gboolean res; MonoContext ctx_cp = *ctx; if (mono_trace_is_enabled ()) { MonoMethod *system_exception_get_message = mono_class_get_method_from_name (mono_defaults.exception_class, "get_Message", 0); MonoMethod *get_message = system_exception_get_message == NULL ? NULL : mono_object_get_virtual_method (obj, system_exception_get_message); MonoObject *message; const char *type_name = mono_class_get_name (mono_object_class (mono_ex)); char *msg = NULL; MonoObject *exc = NULL; if (get_message == NULL) { message = NULL; } else if (!strcmp (type_name, "OutOfMemoryException") || !strcmp (type_name, "StackOverflowException")) { message = NULL; msg = g_strdup_printf ("(No exception message for: %s)\n", type_name); } else { message = mono_runtime_invoke (get_message, obj, NULL, &exc); } if (msg == NULL) { msg = message ? mono_string_to_utf8 ((MonoString *) message) : g_strdup ("(System.Exception.Message property not available)"); } g_print ("[%p:] EXCEPTION handling: %s.%s: %s\n", (void*)GetCurrentThreadId (), mono_object_class (obj)->name_space, mono_object_class (obj)->name, msg); g_free (msg); if (mono_ex && mono_trace_eval_exception (mono_object_class (mono_ex))) mono_print_thread_dump_from_ctx (ctx); } jit_tls->orig_ex_ctx_set = TRUE; mono_profiler_exception_thrown (obj); jit_tls->orig_ex_ctx_set = FALSE; res = mono_handle_exception_internal_first_pass (&ctx_cp, obj, &first_filter_idx, &ji, &prev_ji, non_exception); if (!res) { if (mini_get_debug_options ()->break_on_exc) G_BREAKPOINT (); mono_debugger_agent_handle_exception (obj, ctx, NULL); if (mini_get_debug_options ()->suspend_on_unhandled) { mono_runtime_printf_err ("Unhandled exception, suspending..."); while (1) ; } // FIXME: This runs managed code so it might cause another stack overflow when // we are handling a stack overflow mono_unhandled_exception (obj); } else { gboolean unhandled = FALSE; /* * The exceptions caught by the mono_runtime_invoke () calls in mono_async_invoke () needs to be treated as * unhandled (#669836). * FIXME: The check below is hackish, but its hard to distinguish these runtime invoke calls from others * in the runtime. */ if (ji && jinfo_get_method (ji)->wrapper_type == MONO_WRAPPER_RUNTIME_INVOKE) { if (prev_ji) { MonoInternalThread *thread = mono_thread_internal_current (); if (jinfo_get_method (prev_ji) == thread->async_invoke_method) unhandled = TRUE; } } if (unhandled) mono_debugger_agent_handle_exception (obj, ctx, NULL); else mono_debugger_agent_handle_exception (obj, ctx, &ctx_cp); } } if (out_ji) *out_ji = NULL; filter_idx = 0; initial_ctx = *ctx; while (1) { MonoContext new_ctx; guint32 free_stack; int clause_index_start = 0; gboolean unwind_res = TRUE; if (resume) { resume = FALSE; ji = jit_tls->resume_state.ji; new_ctx = jit_tls->resume_state.new_ctx; clause_index_start = jit_tls->resume_state.clause_index; lmf = jit_tls->resume_state.lmf; first_filter_idx = jit_tls->resume_state.first_filter_idx; filter_idx = jit_tls->resume_state.filter_idx; } else { StackFrameInfo frame; unwind_res = mono_find_jit_info_ext (domain, jit_tls, NULL, ctx, &new_ctx, NULL, &lmf, NULL, &frame); if (unwind_res) { if (frame.type == FRAME_TYPE_DEBUGGER_INVOKE || frame.type == FRAME_TYPE_MANAGED_TO_NATIVE) { *ctx = new_ctx; continue; } g_assert (frame.type == FRAME_TYPE_MANAGED); ji = frame.ji; } } if (!unwind_res) { *(mono_get_lmf_addr ()) = lmf; jit_tls->abort_func (obj); g_assert_not_reached (); } method = jinfo_get_method (ji); frame_count ++; //printf ("M: %s %d.\n", mono_method_full_name (method, TRUE), frame_count); if (stack_overflow) { if (DOES_STACK_GROWS_UP) free_stack = (guint8*)(MONO_CONTEXT_GET_SP (ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)); else free_stack = (guint8*)(MONO_CONTEXT_GET_SP (&initial_ctx)) - (guint8*)(MONO_CONTEXT_GET_SP (ctx)); } else { free_stack = 0xffffff; } for (i = clause_index_start; i < ji->num_clauses; i++) { MonoJitExceptionInfo *ei = &ji->clauses [i]; gboolean filtered = FALSE; /* * During stack overflow, wait till the unwinding frees some stack * space before running handlers/finalizers. */ if (free_stack <= (64 * 1024)) continue; if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx))) { /* catch block */ MonoClass *catch_class = get_exception_catch_class (ei, ji, ctx); /* * Have to unwrap RuntimeWrappedExceptions if the * method's assembly doesn't have a RuntimeCompatibilityAttribute. */ if (non_exception && !wrap_non_exception_throws (method)) ex_obj = non_exception; else ex_obj = obj; if (((ei->flags == MONO_EXCEPTION_CLAUSE_NONE) || (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER))) { if (ji->from_llvm) { #ifdef MONO_CONTEXT_SET_LLVM_EXC_REG MONO_CONTEXT_SET_LLVM_EXC_REG (ctx, ex_obj); #else g_assert_not_reached (); #endif } else { /* store the exception object in bp + ei->exvar_offset */ *((gpointer *)(gpointer)((char *)MONO_CONTEXT_GET_BP (ctx) + ei->exvar_offset)) = ex_obj; } } if (ei->flags == MONO_EXCEPTION_CLAUSE_FILTER) { /* * Filter clauses should only be run in the * first pass of exception handling. */ filtered = (filter_idx == first_filter_idx); filter_idx ++; } if ((ei->flags == MONO_EXCEPTION_CLAUSE_NONE && mono_object_isinst (ex_obj, catch_class)) || filtered) { /* * This guards against the situation that we abort a thread that is executing a finally clause * that was called by the EH machinery. It won't have a guard trampoline installed, so we must * check for this situation here and resume interruption if we are below the guarded block. */ if (G_UNLIKELY (jit_tls->handler_block_return_address)) { gboolean is_outside = FALSE; gpointer prot_bp = MONO_CONTEXT_GET_BP (&jit_tls->handler_block_context); gpointer catch_bp = MONO_CONTEXT_GET_BP (ctx); //FIXME make this stack direction aware if (catch_bp > prot_bp) { is_outside = TRUE; } else if (catch_bp == prot_bp) { /* Can be either try { try { } catch {} } finally {} or try { try { } finally {} } catch {} * So we check if the catch handler_start is protected by the guarded handler protected region * * Assumptions: * If there is an outstanding guarded_block return address, it means the current thread must be aborted. * This is the only way to reach out the guarded block as other cases are handled by the trampoline. * There aren't any further finally/fault handler blocks down the stack over this exception. * This must be ensured by the code that installs the guard trampoline. */ g_assert (ji == mini_jit_info_table_find (domain, MONO_CONTEXT_GET_IP (&jit_tls->handler_block_context), NULL)); if (!is_address_protected (ji, jit_tls->handler_block, ei->handler_start)) { is_outside = TRUE; } } if (is_outside) { jit_tls->handler_block_return_address = NULL; jit_tls->handler_block = NULL; mono_thread_resume_interruption (); /*We ignore the exception here, it will be raised later*/ } } if (mono_trace_is_enabled () && mono_trace_eval (method)) g_print ("EXCEPTION: catch found at clause %d of %s\n", i, mono_method_full_name (method, TRUE)); jit_tls->orig_ex_ctx_set = TRUE; mono_profiler_exception_clause_handler (method, ei->flags, i); jit_tls->orig_ex_ctx_set = FALSE; MONO_CONTEXT_SET_IP (ctx, ei->handler_start); *(mono_get_lmf_addr ()) = lmf; #ifndef DISABLE_PERFCOUNTERS mono_perfcounters->exceptions_depth += frame_count; #endif if (obj == domain->stack_overflow_ex) jit_tls->handling_stack_ovf = FALSE; return 0; } if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) && (ei->flags == MONO_EXCEPTION_CLAUSE_FAULT)) { if (mono_trace_is_enabled () && mono_trace_eval (method)) g_print ("EXCEPTION: fault clause %d of %s\n", i, mono_method_full_name (method, TRUE)); jit_tls->orig_ex_ctx_set = TRUE; mono_profiler_exception_clause_handler (method, ei->flags, i); jit_tls->orig_ex_ctx_set = FALSE; call_filter (ctx, ei->handler_start); } if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (ctx)) && (ei->flags == MONO_EXCEPTION_CLAUSE_FINALLY)) { if (mono_trace_is_enabled () && mono_trace_eval (method)) g_print ("EXCEPTION: finally clause %d of %s\n", i, mono_method_full_name (method, TRUE)); jit_tls->orig_ex_ctx_set = TRUE; mono_profiler_exception_clause_handler (method, ei->flags, i); jit_tls->orig_ex_ctx_set = FALSE; #ifndef DISABLE_PERFCOUNTERS mono_perfcounters->exceptions_finallys++; #endif *(mono_get_lmf_addr ()) = lmf; if (ji->from_llvm) { /* * LLVM compiled finally handlers follow the design * of the c++ ehabi, i.e. they call a resume function * at the end instead of returning to the caller. * So save the exception handling state, * mono_resume_unwind () will call us again to continue * the unwinding. */ jit_tls->resume_state.ex_obj = obj; jit_tls->resume_state.ji = ji; jit_tls->resume_state.clause_index = i + 1; jit_tls->resume_state.ctx = *ctx; jit_tls->resume_state.new_ctx = new_ctx; jit_tls->resume_state.lmf = lmf; jit_tls->resume_state.first_filter_idx = first_filter_idx; jit_tls->resume_state.filter_idx = filter_idx; MONO_CONTEXT_SET_IP (ctx, ei->handler_start); return 0; } else { call_filter (ctx, ei->handler_start); } } } } jit_tls->orig_ex_ctx_set = TRUE; mono_profiler_exception_method_leave (method); jit_tls->orig_ex_ctx_set = FALSE; *ctx = new_ctx; } g_assert_not_reached (); } /** * mono_debugger_run_finally: * @start_ctx: saved processor state * * This method is called by the Mono Debugger to call all `finally' clauses of the * current stack frame. It's used when the user issues a `return' command to make * the current stack frame return. After returning from this method, the debugger * unwinds the stack one frame and gives control back to the user. * * NOTE: This method is only used when running inside the Mono Debugger. */ void mono_debugger_run_finally (MonoContext *start_ctx) { static int (*call_filter) (MonoContext *, gpointer) = NULL; MonoDomain *domain = mono_domain_get (); MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoLMF *lmf = mono_get_lmf (); MonoContext ctx, new_ctx; MonoJitInfo *ji, rji; int i; ctx = *start_ctx; ji = mono_find_jit_info (domain, jit_tls, &rji, NULL, &ctx, &new_ctx, NULL, &lmf, NULL, NULL); if (!ji || ji == (gpointer)-1) return; if (!call_filter) call_filter = mono_get_call_filter (); for (i = 0; i < ji->num_clauses; i++) { MonoJitExceptionInfo *ei = &ji->clauses [i]; if (is_address_protected (ji, ei, MONO_CONTEXT_GET_IP (&ctx)) && (ei->flags & MONO_EXCEPTION_CLAUSE_FINALLY)) { call_filter (&ctx, ei->handler_start); } } } /** * mono_handle_exception: * @ctx: saved processor state * @obj: the exception object */ gboolean mono_handle_exception (MonoContext *ctx, gpointer obj) { #ifndef DISABLE_PERFCOUNTERS mono_perfcounters->exceptions_thrown++; #endif return mono_handle_exception_internal (ctx, obj, FALSE, NULL); } #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK #ifndef MONO_ARCH_USE_SIGACTION #error "Can't use sigaltstack without sigaction" #endif #define ALIGN_TO(val,align) ((((guint64)val) + ((align) - 1)) & ~((align) - 1)) void mono_setup_altstack (MonoJitTlsData *tls) { size_t stsize = 0; stack_t sa; guint8 *staddr = NULL; if (mono_running_on_valgrind ()) return; mono_thread_get_stack_bounds (&staddr, &stsize); g_assert (staddr); tls->end_of_stack = staddr + stsize; tls->stack_size = stsize; /*g_print ("thread %p, stack_base: %p, stack_size: %d\n", (gpointer)pthread_self (), staddr, stsize);*/ tls->stack_ovf_guard_base = staddr + mono_pagesize (); tls->stack_ovf_guard_size = ALIGN_TO (8 * 4096, mono_pagesize ()); g_assert ((guint8*)&sa >= (guint8*)tls->stack_ovf_guard_base + tls->stack_ovf_guard_size); if (mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_NONE)) { /* mprotect can fail for the main thread stack */ 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); g_assert (gaddr == tls->stack_ovf_guard_base); tls->stack_ovf_valloced = TRUE; } /* Setup an alternate signal stack */ tls->signal_stack = mono_valloc (0, MONO_ARCH_SIGNAL_STACK_SIZE, MONO_MMAP_READ|MONO_MMAP_WRITE|MONO_MMAP_PRIVATE|MONO_MMAP_ANON); tls->signal_stack_size = MONO_ARCH_SIGNAL_STACK_SIZE; g_assert (tls->signal_stack); sa.ss_sp = tls->signal_stack; sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE; sa.ss_flags = 0; g_assert (sigaltstack (&sa, NULL) == 0); 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); } void mono_free_altstack (MonoJitTlsData *tls) { stack_t sa; int err; sa.ss_sp = tls->signal_stack; sa.ss_size = MONO_ARCH_SIGNAL_STACK_SIZE; sa.ss_flags = SS_DISABLE; err = sigaltstack (&sa, NULL); g_assert (err == 0); if (tls->signal_stack) mono_vfree (tls->signal_stack, MONO_ARCH_SIGNAL_STACK_SIZE); if (tls->stack_ovf_valloced) mono_vfree (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size); else mono_mprotect (tls->stack_ovf_guard_base, tls->stack_ovf_guard_size, MONO_MMAP_READ|MONO_MMAP_WRITE); } #else /* !MONO_ARCH_SIGSEGV_ON_ALTSTACK */ void mono_setup_altstack (MonoJitTlsData *tls) { } void mono_free_altstack (MonoJitTlsData *tls) { } #endif /* MONO_ARCH_SIGSEGV_ON_ALTSTACK */ static gboolean try_restore_stack_protection (MonoJitTlsData *jit_tls, int extra_bytes) { gint32 unprotect_size = jit_tls->stack_ovf_guard_size; /* we need to leave some room for throwing the exception */ while (unprotect_size >= 0 && (char*)jit_tls->stack_ovf_guard_base + unprotect_size > ((char*)&unprotect_size - extra_bytes)) unprotect_size -= mono_pagesize (); /* at this point we could try and build a new domain->stack_overflow_ex, but only if there * is sufficient stack */ //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); if (unprotect_size) mono_mprotect (jit_tls->stack_ovf_guard_base, unprotect_size, MONO_MMAP_NONE); return unprotect_size == jit_tls->stack_ovf_guard_size; } static G_GNUC_UNUSED void try_more_restore (void) { MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); if (try_restore_stack_protection (jit_tls, 500)) jit_tls->restore_stack_prot = NULL; } static G_GNUC_UNUSED void restore_stack_protection (void) { MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoException *ex = mono_domain_get ()->stack_overflow_ex; /* if we can't restore the stack protection, keep a callback installed so * we'll try to restore as much stack as we can at each return from unmanaged * code. */ if (try_restore_stack_protection (jit_tls, 4096)) jit_tls->restore_stack_prot = NULL; else jit_tls->restore_stack_prot = try_more_restore_tramp; /* here we also throw a stack overflow exception */ ex->trace_ips = NULL; ex->stack_trace = NULL; mono_raise_exception (ex); } gpointer mono_altstack_restore_prot (mgreg_t *regs, guint8 *code, gpointer *tramp_data, guint8* tramp) { void (*func)(void) = (gpointer)tramp_data; func (); return NULL; } gboolean mono_handle_soft_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr) { /* we got a stack overflow in the soft-guard pages * There are two cases: * 1) managed code caused the overflow: we unprotect the soft-guard page * and let the arch-specific code trigger the exception handling mechanism * in the thread stack. The soft-guard pages will be protected again as the stack is unwound. * 2) unmanaged code caused the overflow: we unprotect the soft-guard page * and hope we can continue with those enabled, at least until the hard-guard page * is hit. The alternative to continuing here is to just print a message and abort. * We may add in the future the code to protect the pages again in the codepath * when we return from unmanaged to managed code. */ if (jit_tls->stack_ovf_guard_size && fault_addr >= (guint8*)jit_tls->stack_ovf_guard_base && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + jit_tls->stack_ovf_guard_size) { /* we unprotect the minimum amount we can */ guint32 guard_size; gboolean handled = FALSE; guard_size = jit_tls->stack_ovf_guard_size - (mono_pagesize () * SIZEOF_VOID_P / 4); while (guard_size && fault_addr < (guint8*)jit_tls->stack_ovf_guard_base + guard_size) { guard_size -= mono_pagesize (); } guard_size = jit_tls->stack_ovf_guard_size - guard_size; /*fprintf (stderr, "unprotecting: %d\n", guard_size);*/ 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); #ifdef MONO_ARCH_SIGSEGV_ON_ALTSTACK if (ji) { mono_arch_handle_altstack_exception (ctx, fault_addr, TRUE); handled = TRUE; } #endif if (!handled) { /* We print a message: after this even managed stack overflows * may crash the runtime */ mono_runtime_printf_err ("Stack overflow in unmanaged: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr); if (!jit_tls->handling_stack_ovf) { jit_tls->restore_stack_prot = restore_stack_protection_tramp; jit_tls->handling_stack_ovf = 1; } else { /*fprintf (stderr, "Already handling stack overflow\n");*/ } } return TRUE; } return FALSE; } typedef struct { MonoMethod *omethod; int count; } PrintOverflowUserData; #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX static gboolean print_overflow_stack_frame (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { MonoMethod *method = NULL; PrintOverflowUserData *user_data = data; gchar *location; if (frame->ji) method = jinfo_get_method (frame->ji); if (method) { if (user_data->count == 0) { /* The first frame is in its prolog, so a line number cannot be computed */ user_data->count ++; return FALSE; } /* If this is a one method overflow, skip the other instances */ if (method == user_data->omethod) return FALSE; location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ()); mono_runtime_printf_err (" %s", location); g_free (location); if (user_data->count == 1) { mono_runtime_printf_err (" <...>"); user_data->omethod = method; } else { user_data->omethod = NULL; } user_data->count ++; } else mono_runtime_printf_err (" at <0x%05x>", frame->native_offset); return FALSE; } #endif void mono_handle_hard_stack_ovf (MonoJitTlsData *jit_tls, MonoJitInfo *ji, void *ctx, guint8* fault_addr) { #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX PrintOverflowUserData ud; MonoContext mctx; #endif /* we don't do much now, but we can warn the user with a useful message */ mono_runtime_printf_err ("Stack overflow: IP: %p, fault addr: %p", mono_arch_ip_from_context (ctx), fault_addr); #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX mono_arch_sigctx_to_monoctx (ctx, &mctx); mono_runtime_printf_err ("Stacktrace:"); memset (&ud, 0, sizeof (ud)); mono_walk_stack_with_ctx (print_overflow_stack_frame, &mctx, MONO_UNWIND_LOOKUP_ACTUAL_METHOD, &ud); #else if (ji && jinfo_get_method (ji)) mono_runtime_printf_err ("At %s", mono_method_full_name (jinfo_get_method (ji), TRUE)); else mono_runtime_printf_err ("At ."); #endif _exit (1); } static gboolean print_stack_frame_to_stderr (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { MonoMethod *method = NULL; if (frame->ji) method = jinfo_get_method (frame->ji); if (method) { gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ()); mono_runtime_printf_err (" %s", location); g_free (location); } else mono_runtime_printf_err (" at <0x%05x>", frame->native_offset); return FALSE; } static G_GNUC_UNUSED gboolean print_stack_frame_to_string (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { GString *p = (GString*)data; MonoMethod *method = NULL; if (frame->ji) method = jinfo_get_method (frame->ji); if (method) { gchar *location = mono_debug_print_stack_frame (method, frame->native_offset, mono_domain_get ()); g_string_append_printf (p, " %s\n", location); g_free (location); } else g_string_append_printf (p, " at <0x%05x>\n", frame->native_offset); return FALSE; } static gboolean handling_sigsegv = FALSE; /* * mono_handle_native_sigsegv: * * Handle a SIGSEGV received while in native code by printing diagnostic * information and aborting. */ void mono_handle_native_sigsegv (int signal, void *ctx) { #ifdef MONO_ARCH_USE_SIGACTION struct sigaction sa; #endif MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); const char *signal_str = (signal == SIGSEGV) ? "SIGSEGV" : "SIGABRT"; if (handling_sigsegv) return; if (mini_get_debug_options ()->suspend_on_sigsegv) { mono_runtime_printf_err ("Received SIGSEGV, suspending..."); #ifdef HOST_WIN32 while (1) ; #else while (1) { sleep (0); } #endif } /* To prevent infinite loops when the stack walk causes a crash */ handling_sigsegv = TRUE; /* !jit_tls means the thread was not registered with the runtime */ if (jit_tls && mono_thread_internal_current ()) { mono_runtime_printf_err ("Stacktrace:\n"); mono_walk_stack (print_stack_frame_to_stderr, TRUE, NULL); } #ifdef HAVE_BACKTRACE_SYMBOLS { void *array [256]; char **names; int i, size; mono_runtime_printf_err ("\nNative stacktrace:\n"); size = backtrace (array, 256); names = backtrace_symbols (array, size); for (i =0; i < size; ++i) { mono_runtime_printf_err ("\t%s", names [i]); } free (names); /* Try to get more meaningful information using gdb */ #if !defined(HOST_WIN32) && defined(HAVE_SYS_SYSCALL_H) && defined(SYS_fork) if (!mini_get_debug_options ()->no_gdb_backtrace) { /* From g_spawn_command_line_sync () in eglib */ pid_t pid; int status; pid_t crashed_pid = getpid (); //pid = fork (); /* * glibc fork acquires some locks, so if the crash happened inside malloc/free, * it will deadlock. Call the syscall directly instead. */ pid = mono_runtime_syscall_fork (); if (pid == 0) { dup2 (STDERR_FILENO, STDOUT_FILENO); mono_gdb_render_native_backtraces (crashed_pid); exit (1); } mono_runtime_printf_err ("\nDebug info from gdb:\n"); waitpid (pid, &status, 0); } #endif } #endif /* * A SIGSEGV indicates something went very wrong so we can no longer depend * on anything working. So try to print out lots of diagnostics, starting * with ones which have a greater chance of working. */ mono_runtime_printf_err ( "\n" "=================================================================\n" "Got a %s while executing native code. This usually indicates\n" "a fatal error in the mono runtime or one of the native libraries \n" "used by your application.\n" "=================================================================\n", signal_str); #ifdef MONO_ARCH_USE_SIGACTION /* Remove our SIGABRT handler */ sa.sa_handler = SIG_DFL; sigemptyset (&sa.sa_mask); sa.sa_flags = 0; g_assert (sigaction (SIGABRT, &sa, NULL) != -1); #endif /*Android abort is a fluke, it doesn't abort, it triggers another segv. */ #if defined (PLATFORM_ANDROID) exit (-1); #else abort (); #endif } static void mono_print_thread_dump_internal (void *sigctx, MonoContext *start_ctx) { MonoInternalThread *thread = mono_thread_internal_current (); #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX MonoContext ctx; #endif GString* text = g_string_new (0); char *name, *wapi_desc; GError *error = NULL; if (thread->name) { name = g_utf16_to_utf8 (thread->name, thread->name_len, NULL, NULL, &error); g_assert (!error); g_string_append_printf (text, "\n\"%s\"", name); g_free (name); } else if (thread->threadpool_thread) g_string_append (text, "\n\"\""); else g_string_append (text, "\n\"\""); #ifndef HOST_WIN32 wapi_desc = wapi_current_thread_desc (); g_string_append_printf (text, " tid=0x%p this=0x%p %s\n", (gpointer)(gsize)thread->tid, thread, wapi_desc); free (wapi_desc); #endif #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX if (start_ctx) { memcpy (&ctx, start_ctx, sizeof (MonoContext)); } else if (!sigctx) MONO_INIT_CONTEXT_FROM_FUNC (&ctx, mono_print_thread_dump); else mono_arch_sigctx_to_monoctx (sigctx, &ctx); mono_walk_stack_with_ctx (print_stack_frame_to_string, &ctx, MONO_UNWIND_LOOKUP_ALL, text); #else mono_runtime_printf ("\t"); #endif mono_runtime_printf ("%s", text->str); #if PLATFORM_WIN32 && TARGET_WIN32 && _DEBUG OutputDebugStringA(text->str); #endif g_string_free (text, TRUE); mono_runtime_stdout_fflush (); } /* * mono_print_thread_dump: * * Print information about the current thread to stdout. * SIGCTX can be NULL, allowing this to be called from gdb. */ void mono_print_thread_dump (void *sigctx) { mono_print_thread_dump_internal (sigctx, NULL); } void mono_print_thread_dump_from_ctx (MonoContext *ctx) { mono_print_thread_dump_internal (NULL, ctx); } /* * mono_resume_unwind: * * This is called by a trampoline from LLVM compiled finally clauses to continue * unwinding. */ void mono_resume_unwind (MonoContext *ctx) { MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); MonoContext new_ctx; MONO_CONTEXT_SET_IP (ctx, MONO_CONTEXT_GET_IP (&jit_tls->resume_state.ctx)); MONO_CONTEXT_SET_SP (ctx, MONO_CONTEXT_GET_SP (&jit_tls->resume_state.ctx)); new_ctx = *ctx; mono_handle_exception_internal (&new_ctx, jit_tls->resume_state.ex_obj, TRUE, NULL); mono_restore_context (&new_ctx); } #ifdef MONO_ARCH_HAVE_HANDLER_BLOCK_GUARD typedef struct { MonoJitInfo *ji; MonoContext ctx; MonoJitExceptionInfo *ei; } FindHandlerBlockData; static gboolean find_last_handler_block (StackFrameInfo *frame, MonoContext *ctx, gpointer data) { int i; gpointer ip; FindHandlerBlockData *pdata = data; MonoJitInfo *ji = frame->ji; if (!ji) return FALSE; ip = MONO_CONTEXT_GET_IP (ctx); for (i = 0; i < ji->num_clauses; ++i) { MonoJitExceptionInfo *ei = ji->clauses + i; if (ei->flags != MONO_EXCEPTION_CLAUSE_FINALLY) continue; /*If ip points to the first instruction it means the handler block didn't start so we can leave its execution to the EH machinery*/ if (ei->handler_start < ip && ip < ei->data.handler_end) { pdata->ji = ji; pdata->ei = ei; pdata->ctx = *ctx; break; } } return FALSE; } static gpointer install_handler_block_guard (MonoJitInfo *ji, MonoContext *ctx) { int i; MonoJitExceptionInfo *clause = NULL; gpointer ip; ip = MONO_CONTEXT_GET_IP (ctx); for (i = 0; i < ji->num_clauses; ++i) { clause = &ji->clauses [i]; if (clause->flags != MONO_EXCEPTION_CLAUSE_FINALLY) continue; if (clause->handler_start < ip && clause->data.handler_end > ip) break; } /*no matching finally */ if (i == ji->num_clauses) return NULL; /*If we stopped on the instruction right before the try, we haven't actually started executing it*/ if (ip == clause->handler_start) return NULL; return mono_arch_install_handler_block_guard (ji, clause, ctx, mono_create_handler_block_trampoline ()); } /* * Finds the bottom handler block running and install a block guard if needed. * FIXME add full-aot support. */ gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx) { FindHandlerBlockData data = { 0 }; MonoJitTlsData *jit_tls = ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS]; gpointer resume_ip; /* FIXME */ if (mono_aot_only) return FALSE; /* Guard against a null MonoJitTlsData. This can happens if the thread receives the * interrupt signal before the JIT has time to initialize its TLS data for the given thread. */ if (!jit_tls || jit_tls->handler_block_return_address) return FALSE; /* Do an async safe stack walk */ mono_thread_info_set_is_async_context (TRUE); mono_walk_stack_with_state (find_last_handler_block, ctx, MONO_UNWIND_NONE, &data); mono_thread_info_set_is_async_context (FALSE); if (!data.ji) return FALSE; memcpy (&jit_tls->handler_block_context, &data.ctx, sizeof (MonoContext)); resume_ip = install_handler_block_guard (data.ji, &data.ctx); if (resume_ip == NULL) return FALSE; jit_tls->handler_block_return_address = resume_ip; jit_tls->handler_block = data.ei; return TRUE; } #else gboolean mono_install_handler_block_guard (MonoThreadUnwindState *ctx) { return FALSE; } #endif void mono_set_cast_details (MonoClass *from, MonoClass *to) { MonoJitTlsData *jit_tls = NULL; if (mini_get_debug_options ()->better_cast_details) { jit_tls = mono_native_tls_get_value (mono_jit_tls_id); jit_tls->class_cast_from = from; jit_tls->class_cast_to = to; } } /*returns false if the thread is not attached*/ gboolean mono_thread_state_init_from_sigctx (MonoThreadUnwindState *ctx, void *sigctx) { #ifdef MONO_ARCH_HAVE_SIGCTX_TO_MONOCTX MonoInternalThread *thread = mono_thread_internal_current (); if (!thread || !thread->jit_data) { ctx->valid = FALSE; return FALSE; } if (sigctx) mono_arch_sigctx_to_monoctx (sigctx, &ctx->ctx); else #if MONO_ARCH_HAS_MONO_CONTEXT && !defined(MONO_CROSS_COMPILE) MONO_CONTEXT_GET_CURRENT (ctx->ctx); #else g_error ("Use a null sigctx requires a working mono-context"); #endif ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get (); ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf (); ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data; ctx->valid = TRUE; return TRUE; #else g_error ("Implement mono_arch_sigctx_to_monoctx for the current target"); return FALSE; #endif } gboolean mono_thread_state_init_from_monoctx (MonoThreadUnwindState *ctx, MonoContext *mctx) { MonoInternalThread *thread = mono_thread_internal_current (); if (!thread || !thread->jit_data) { ctx->valid = FALSE; return FALSE; } ctx->ctx = *mctx; ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get (); ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf (); ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data; ctx->valid = TRUE; return TRUE; } /*returns false if the thread is not attached*/ gboolean mono_thread_state_init_from_current (MonoThreadUnwindState *ctx) { MonoInternalThread *thread = mono_thread_internal_current (); MONO_ARCH_CONTEXT_DEF mono_arch_flush_register_windows (); if (!thread || !thread->jit_data) { ctx->valid = FALSE; return FALSE; } #ifdef MONO_INIT_CONTEXT_FROM_CURRENT MONO_INIT_CONTEXT_FROM_CURRENT (&ctx->ctx); #else MONO_INIT_CONTEXT_FROM_FUNC (&ctx->ctx, mono_thread_state_init_from_current); #endif ctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = mono_domain_get (); ctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_get_lmf (); ctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = thread->jit_data; ctx->valid = TRUE; return TRUE; } static void mono_raise_exception_with_ctx (MonoException *exc, MonoContext *ctx) { mono_handle_exception (ctx, exc); mono_restore_context (ctx); } /*FIXME Move all monoctx -> sigctx conversion to signal handlers once all archs support utils/mono-context */ void mono_setup_async_callback (MonoContext *ctx, void (*async_cb)(void *fun), gpointer user_data) { #ifdef MONO_ARCH_HAVE_SETUP_ASYNC_CALLBACK MonoJitTlsData *jit_tls = mono_native_tls_get_value (mono_jit_tls_id); jit_tls->ex_ctx = *ctx; mono_arch_setup_async_callback (ctx, async_cb, user_data); #else g_error ("This target doesn't support mono_arch_setup_async_callback"); #endif } void mono_install_unhandled_exception_hook (MonoUnhandledExceptionFunc func, gpointer user_data) { unhandled_exception_hook = func; unhandled_exception_hook_data = user_data; } void mono_invoke_unhandled_exception_hook (MonoObject *exc) { if (unhandled_exception_hook) { unhandled_exception_hook (exc, unhandled_exception_hook_data); } else { MonoObject *other = NULL; MonoString *str = mono_object_to_string (exc, &other); char *msg = NULL; if (str) msg = mono_string_to_utf8 (str); else if (other) { char *original_backtrace = mono_exception_get_managed_backtrace ((MonoException*)exc); char *nested_backtrace = mono_exception_get_managed_backtrace ((MonoException*)other); msg = g_strdup_printf ("Nested exception detected.\nOriginal Exception: %s\nNested exception:%s\n", original_backtrace, nested_backtrace); g_free (original_backtrace); g_free (nested_backtrace); } else { msg = g_strdup ("Nested exception trying to figure out what went wrong"); } mono_runtime_printf_err ("[ERROR] FATAL UNHANDLED EXCEPTION: %s", msg); g_free (msg); #if defined(__APPLE__) && defined(__arm__) g_assertion_message ("Terminating runtime due to unhandled exception"); #else exit (mono_environment_exitcode_get ()); #endif } g_assert_not_reached (); } /* * mono_restore_context: * * Call the architecture specific restore context function. */ void mono_restore_context (MonoContext *ctx) { static void (*restore_context) (MonoContext *); if (!restore_context) restore_context = mono_get_restore_context (); restore_context (ctx); g_assert_not_reached (); }