// Copyright 2011 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "src/messages.h" #include <memory> #include "src/api-inl.h" #include "src/counters.h" #include "src/execution.h" #include "src/isolate-inl.h" #include "src/keys.h" #include "src/objects/foreign-inl.h" #include "src/objects/frame-array-inl.h" #include "src/objects/js-array-inl.h" #include "src/objects/struct-inl.h" #include "src/string-builder-inl.h" #include "src/wasm/wasm-code-manager.h" #include "src/wasm/wasm-objects.h" namespace v8 { namespace internal { MessageLocation::MessageLocation(Handle<Script> script, int start_pos, int end_pos) : script_(script), start_pos_(start_pos), end_pos_(end_pos) {} MessageLocation::MessageLocation(Handle<Script> script, int start_pos, int end_pos, Handle<SharedFunctionInfo> shared) : script_(script), start_pos_(start_pos), end_pos_(end_pos), shared_(shared) {} MessageLocation::MessageLocation() : start_pos_(-1), end_pos_(-1) {} // If no message listeners have been registered this one is called // by default. void MessageHandler::DefaultMessageReport(Isolate* isolate, const MessageLocation* loc, Handle<Object> message_obj) { std::unique_ptr<char[]> str = GetLocalizedMessage(isolate, message_obj); if (loc == nullptr) { PrintF("%s\n", str.get()); } else { HandleScope scope(isolate); Handle<Object> data(loc->script()->name(), isolate); std::unique_ptr<char[]> data_str; if (data->IsString()) data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS); PrintF("%s:%i: %s\n", data_str.get() ? data_str.get() : "<unknown>", loc->start_pos(), str.get()); } } Handle<JSMessageObject> MessageHandler::MakeMessageObject( Isolate* isolate, MessageTemplate message, const MessageLocation* location, Handle<Object> argument, Handle<FixedArray> stack_frames) { Factory* factory = isolate->factory(); int start = -1; int end = -1; Handle<Script> script_handle = isolate->factory()->empty_script(); if (location != nullptr) { start = location->start_pos(); end = location->end_pos(); script_handle = location->script(); } Handle<Object> stack_frames_handle = stack_frames.is_null() ? Handle<Object>::cast(factory->undefined_value()) : Handle<Object>::cast(stack_frames); Handle<JSMessageObject> message_obj = factory->NewJSMessageObject( message, argument, start, end, script_handle, stack_frames_handle); return message_obj; } void MessageHandler::ReportMessage(Isolate* isolate, const MessageLocation* loc, Handle<JSMessageObject> message) { v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message); if (api_message_obj->ErrorLevel() == v8::Isolate::kMessageError) { // We are calling into embedder's code which can throw exceptions. // Thus we need to save current exception state, reset it to the clean one // and ignore scheduled exceptions callbacks can throw. // We pass the exception object into the message handler callback though. Object exception_object = ReadOnlyRoots(isolate).undefined_value(); if (isolate->has_pending_exception()) { exception_object = isolate->pending_exception(); } Handle<Object> exception(exception_object, isolate); Isolate::ExceptionScope exception_scope(isolate); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); // Turn the exception on the message into a string if it is an object. if (message->argument()->IsJSObject()) { HandleScope scope(isolate); Handle<Object> argument(message->argument(), isolate); MaybeHandle<Object> maybe_stringified; Handle<Object> stringified; // Make sure we don't leak uncaught internally generated Error objects. if (argument->IsJSError()) { maybe_stringified = Object::NoSideEffectsToString(isolate, argument); } else { v8::TryCatch catcher(reinterpret_cast<v8::Isolate*>(isolate)); catcher.SetVerbose(false); catcher.SetCaptureMessage(false); maybe_stringified = Object::ToString(isolate, argument); } if (!maybe_stringified.ToHandle(&stringified)) { DCHECK(isolate->has_pending_exception()); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); stringified = isolate->factory()->NewStringFromAsciiChecked("exception"); } message->set_argument(*stringified); } v8::Local<v8::Value> api_exception_obj = v8::Utils::ToLocal(exception); ReportMessageNoExceptions(isolate, loc, message, api_exception_obj); } else { ReportMessageNoExceptions(isolate, loc, message, v8::Local<v8::Value>()); } } void MessageHandler::ReportMessageNoExceptions( Isolate* isolate, const MessageLocation* loc, Handle<Object> message, v8::Local<v8::Value> api_exception_obj) { v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message); int error_level = api_message_obj->ErrorLevel(); Handle<TemplateList> global_listeners = isolate->factory()->message_listeners(); int global_length = global_listeners->length(); if (global_length == 0) { DefaultMessageReport(isolate, loc, message); if (isolate->has_scheduled_exception()) { isolate->clear_scheduled_exception(); } } else { for (int i = 0; i < global_length; i++) { HandleScope scope(isolate); if (global_listeners->get(i)->IsUndefined(isolate)) continue; FixedArray listener = FixedArray::cast(global_listeners->get(i)); Foreign callback_obj = Foreign::cast(listener->get(0)); int32_t message_levels = static_cast<int32_t>(Smi::ToInt(listener->get(2))); if (!(message_levels & error_level)) { continue; } v8::MessageCallback callback = FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address()); Handle<Object> callback_data(listener->get(1), isolate); { RuntimeCallTimerScope timer( isolate, RuntimeCallCounterId::kMessageListenerCallback); // Do not allow exceptions to propagate. v8::TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate)); callback(api_message_obj, callback_data->IsUndefined(isolate) ? api_exception_obj : v8::Utils::ToLocal(callback_data)); } if (isolate->has_scheduled_exception()) { isolate->clear_scheduled_exception(); } } } } Handle<String> MessageHandler::GetMessage(Isolate* isolate, Handle<Object> data) { Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data); Handle<Object> arg = Handle<Object>(message->argument(), isolate); return MessageFormatter::Format(isolate, message->type(), arg); } std::unique_ptr<char[]> MessageHandler::GetLocalizedMessage( Isolate* isolate, Handle<Object> data) { HandleScope scope(isolate); return GetMessage(isolate, data)->ToCString(DISALLOW_NULLS); } namespace { Object EvalFromFunctionName(Isolate* isolate, Handle<Script> script) { if (!script->has_eval_from_shared()) { return ReadOnlyRoots(isolate).undefined_value(); } Handle<SharedFunctionInfo> shared(script->eval_from_shared(), isolate); // Find the name of the function calling eval. if (shared->Name()->BooleanValue(isolate)) { return shared->Name(); } return shared->inferred_name(); } MaybeHandle<String> FormatEvalOrigin(Isolate* isolate, Handle<Script> script) { Handle<Object> sourceURL(script->GetNameOrSourceURL(), isolate); if (!sourceURL->IsUndefined(isolate)) { DCHECK(sourceURL->IsString()); return Handle<String>::cast(sourceURL); } IncrementalStringBuilder builder(isolate); builder.AppendCString("eval at "); Handle<Object> eval_from_function_name = handle(EvalFromFunctionName(isolate, script), isolate); if (eval_from_function_name->BooleanValue(isolate)) { Handle<String> str; ASSIGN_RETURN_ON_EXCEPTION( isolate, str, Object::ToString(isolate, eval_from_function_name), String); builder.AppendString(str); } else { builder.AppendCString("<anonymous>"); } if (script->has_eval_from_shared()) { Handle<SharedFunctionInfo> eval_from_shared(script->eval_from_shared(), isolate); if (eval_from_shared->script()->IsScript()) { Handle<Script> eval_from_script = handle(Script::cast(eval_from_shared->script()), isolate); builder.AppendCString(" ("); if (eval_from_script->compilation_type() == Script::COMPILATION_TYPE_EVAL) { // Eval script originated from another eval. Handle<String> str; ASSIGN_RETURN_ON_EXCEPTION( isolate, str, FormatEvalOrigin(isolate, eval_from_script), String); builder.AppendString(str); } else { DCHECK(eval_from_script->compilation_type() != Script::COMPILATION_TYPE_EVAL); // eval script originated from "real" source. Handle<Object> name_obj = handle(eval_from_script->name(), isolate); if (eval_from_script->name()->IsString()) { builder.AppendString(Handle<String>::cast(name_obj)); Script::PositionInfo info; if (Script::GetPositionInfo(eval_from_script, Script::GetEvalPosition(isolate, script), &info, Script::NO_OFFSET)) { builder.AppendCString(":"); Handle<String> str = isolate->factory()->NumberToString( handle(Smi::FromInt(info.line + 1), isolate)); builder.AppendString(str); builder.AppendCString(":"); str = isolate->factory()->NumberToString( handle(Smi::FromInt(info.column + 1), isolate)); builder.AppendString(str); } } else { DCHECK(!eval_from_script->name()->IsString()); builder.AppendCString("unknown source"); } } } builder.AppendCString(")"); } Handle<String> result; ASSIGN_RETURN_ON_EXCEPTION(isolate, result, builder.Finish(), String); return result; } } // namespace Handle<Object> StackFrameBase::GetEvalOrigin() { if (!HasScript()) return isolate_->factory()->undefined_value(); return FormatEvalOrigin(isolate_, GetScript()).ToHandleChecked(); } int StackFrameBase::GetScriptId() const { if (!HasScript()) return kNone; return GetScript()->id(); } bool StackFrameBase::IsEval() { return HasScript() && GetScript()->compilation_type() == Script::COMPILATION_TYPE_EVAL; } MaybeHandle<String> StackFrameBase::ToString() { IncrementalStringBuilder builder(isolate_); ToString(builder); return builder.Finish(); } void JSStackFrame::FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix) { DCHECK(!array->IsWasmFrame(frame_ix)); isolate_ = isolate; receiver_ = handle(array->Receiver(frame_ix), isolate); function_ = handle(array->Function(frame_ix), isolate); code_ = handle(array->Code(frame_ix), isolate); offset_ = array->Offset(frame_ix)->value(); const int flags = array->Flags(frame_ix)->value(); is_constructor_ = (flags & FrameArray::kIsConstructor) != 0; is_strict_ = (flags & FrameArray::kIsStrict) != 0; is_async_ = (flags & FrameArray::kIsAsync) != 0; is_promise_all_ = (flags & FrameArray::kIsPromiseAll) != 0; } JSStackFrame::JSStackFrame(Isolate* isolate, Handle<Object> receiver, Handle<JSFunction> function, Handle<AbstractCode> code, int offset) : StackFrameBase(isolate), receiver_(receiver), function_(function), code_(code), offset_(offset), is_async_(false), is_constructor_(false), is_strict_(false) {} Handle<Object> JSStackFrame::GetFunction() const { return Handle<Object>::cast(function_); } Handle<Object> JSStackFrame::GetFileName() { if (!HasScript()) return isolate_->factory()->null_value(); return handle(GetScript()->name(), isolate_); } Handle<Object> JSStackFrame::GetFunctionName() { Handle<String> result = JSFunction::GetName(function_); if (result->length() != 0) return result; if (HasScript() && GetScript()->compilation_type() == Script::COMPILATION_TYPE_EVAL) { return isolate_->factory()->eval_string(); } return isolate_->factory()->null_value(); } namespace { bool CheckMethodName(Isolate* isolate, Handle<JSReceiver> receiver, Handle<Name> name, Handle<JSFunction> fun, LookupIterator::Configuration config) { LookupIterator iter = LookupIterator::PropertyOrElement(isolate, receiver, name, config); if (iter.state() == LookupIterator::DATA) { return iter.GetDataValue().is_identical_to(fun); } else if (iter.state() == LookupIterator::ACCESSOR) { Handle<Object> accessors = iter.GetAccessors(); if (accessors->IsAccessorPair()) { Handle<AccessorPair> pair = Handle<AccessorPair>::cast(accessors); return pair->getter() == *fun || pair->setter() == *fun; } } return false; } Handle<Object> ScriptNameOrSourceUrl(Handle<Script> script, Isolate* isolate) { Object name_or_url = script->source_url(); if (!name_or_url->IsString()) name_or_url = script->name(); return handle(name_or_url, isolate); } } // namespace Handle<Object> JSStackFrame::GetScriptNameOrSourceUrl() { if (!HasScript()) return isolate_->factory()->null_value(); return ScriptNameOrSourceUrl(GetScript(), isolate_); } Handle<Object> JSStackFrame::GetMethodName() { if (receiver_->IsNullOrUndefined(isolate_)) { return isolate_->factory()->null_value(); } Handle<JSReceiver> receiver; if (!Object::ToObject(isolate_, receiver_).ToHandle(&receiver)) { DCHECK(isolate_->has_pending_exception()); isolate_->clear_pending_exception(); isolate_->set_external_caught_exception(false); return isolate_->factory()->null_value(); } Handle<String> name(function_->shared()->Name(), isolate_); name = String::Flatten(isolate_, name); // The static initializer function is not a method, so don't add a // class name, just return the function name. if (name->HasOneBytePrefix(CStrVector("<static_fields_initializer>"))) { return name; } // ES2015 gives getters and setters name prefixes which must // be stripped to find the property name. if (name->HasOneBytePrefix(CStrVector("get ")) || name->HasOneBytePrefix(CStrVector("set "))) { name = isolate_->factory()->NewProperSubString(name, 4, name->length()); } if (CheckMethodName(isolate_, receiver, name, function_, LookupIterator::PROTOTYPE_CHAIN_SKIP_INTERCEPTOR)) { return name; } HandleScope outer_scope(isolate_); Handle<Object> result; for (PrototypeIterator iter(isolate_, receiver, kStartAtReceiver); !iter.IsAtEnd(); iter.Advance()) { Handle<Object> current = PrototypeIterator::GetCurrent(iter); if (!current->IsJSObject()) break; Handle<JSObject> current_obj = Handle<JSObject>::cast(current); if (current_obj->IsAccessCheckNeeded()) break; Handle<FixedArray> keys = KeyAccumulator::GetOwnEnumPropertyKeys(isolate_, current_obj); for (int i = 0; i < keys->length(); i++) { HandleScope inner_scope(isolate_); if (!keys->get(i)->IsName()) continue; Handle<Name> name_key(Name::cast(keys->get(i)), isolate_); if (!CheckMethodName(isolate_, current_obj, name_key, function_, LookupIterator::OWN_SKIP_INTERCEPTOR)) continue; // Return null in case of duplicates to avoid confusion. if (!result.is_null()) return isolate_->factory()->null_value(); result = inner_scope.CloseAndEscape(name_key); } } if (!result.is_null()) return outer_scope.CloseAndEscape(result); return isolate_->factory()->null_value(); } Handle<Object> JSStackFrame::GetTypeName() { // TODO(jgruber): Check for strict/constructor here as in // CallSitePrototypeGetThis. if (receiver_->IsNullOrUndefined(isolate_)) { return isolate_->factory()->null_value(); } else if (receiver_->IsJSProxy()) { return isolate_->factory()->Proxy_string(); } Handle<JSReceiver> receiver; if (!Object::ToObject(isolate_, receiver_).ToHandle(&receiver)) { DCHECK(isolate_->has_pending_exception()); isolate_->clear_pending_exception(); isolate_->set_external_caught_exception(false); return isolate_->factory()->null_value(); } return JSReceiver::GetConstructorName(receiver); } int JSStackFrame::GetLineNumber() { DCHECK_LE(0, GetPosition()); if (HasScript()) return Script::GetLineNumber(GetScript(), GetPosition()) + 1; return kNone; } int JSStackFrame::GetColumnNumber() { DCHECK_LE(0, GetPosition()); if (HasScript()) { return Script::GetColumnNumber(GetScript(), GetPosition()) + 1; } return kNone; } int JSStackFrame::GetPromiseIndex() const { return is_promise_all_ ? offset_ : kNone; } bool JSStackFrame::IsNative() { return HasScript() && GetScript()->type() == Script::TYPE_NATIVE; } bool JSStackFrame::IsToplevel() { return receiver_->IsJSGlobalProxy() || receiver_->IsNullOrUndefined(isolate_); } namespace { bool IsNonEmptyString(Handle<Object> object) { return (object->IsString() && String::cast(*object)->length() > 0); } void AppendFileLocation(Isolate* isolate, StackFrameBase* call_site, IncrementalStringBuilder* builder) { if (call_site->IsNative()) { builder->AppendCString("native"); return; } Handle<Object> file_name = call_site->GetScriptNameOrSourceUrl(); if (!file_name->IsString() && call_site->IsEval()) { Handle<Object> eval_origin = call_site->GetEvalOrigin(); DCHECK(eval_origin->IsString()); builder->AppendString(Handle<String>::cast(eval_origin)); builder->AppendCString(", "); // Expecting source position to follow. } if (IsNonEmptyString(file_name)) { builder->AppendString(Handle<String>::cast(file_name)); } else { // Source code does not originate from a file and is not native, but we // can still get the source position inside the source string, e.g. in // an eval string. builder->AppendCString("<anonymous>"); } int line_number = call_site->GetLineNumber(); if (line_number != StackFrameBase::kNone) { builder->AppendCharacter(':'); Handle<String> line_string = isolate->factory()->NumberToString( handle(Smi::FromInt(line_number), isolate), isolate); builder->AppendString(line_string); int column_number = call_site->GetColumnNumber(); if (column_number != StackFrameBase::kNone) { builder->AppendCharacter(':'); Handle<String> column_string = isolate->factory()->NumberToString( handle(Smi::FromInt(column_number), isolate), isolate); builder->AppendString(column_string); } } } int StringIndexOf(Isolate* isolate, Handle<String> subject, Handle<String> pattern) { if (pattern->length() > subject->length()) return -1; return String::IndexOf(isolate, subject, pattern, 0); } // Returns true iff // 1. the subject ends with '.' + pattern, or // 2. subject == pattern. bool StringEndsWithMethodName(Isolate* isolate, Handle<String> subject, Handle<String> pattern) { if (String::Equals(isolate, subject, pattern)) return true; FlatStringReader subject_reader(isolate, String::Flatten(isolate, subject)); FlatStringReader pattern_reader(isolate, String::Flatten(isolate, pattern)); int pattern_index = pattern_reader.length() - 1; int subject_index = subject_reader.length() - 1; for (int i = 0; i <= pattern_reader.length(); i++) { // Iterate over len + 1. if (subject_index < 0) { return false; } const uc32 subject_char = subject_reader.Get(subject_index); if (i == pattern_reader.length()) { if (subject_char != '.') return false; } else if (subject_char != pattern_reader.Get(pattern_index)) { return false; } pattern_index--; subject_index--; } return true; } void AppendMethodCall(Isolate* isolate, JSStackFrame* call_site, IncrementalStringBuilder* builder) { Handle<Object> type_name = call_site->GetTypeName(); Handle<Object> method_name = call_site->GetMethodName(); Handle<Object> function_name = call_site->GetFunctionName(); if (IsNonEmptyString(function_name)) { Handle<String> function_string = Handle<String>::cast(function_name); if (IsNonEmptyString(type_name)) { Handle<String> type_string = Handle<String>::cast(type_name); bool starts_with_type_name = (StringIndexOf(isolate, function_string, type_string) == 0); if (!starts_with_type_name) { builder->AppendString(type_string); builder->AppendCharacter('.'); } } builder->AppendString(function_string); if (IsNonEmptyString(method_name)) { Handle<String> method_string = Handle<String>::cast(method_name); if (!StringEndsWithMethodName(isolate, function_string, method_string)) { builder->AppendCString(" [as "); builder->AppendString(method_string); builder->AppendCharacter(']'); } } } else { if (IsNonEmptyString(type_name)) { builder->AppendString(Handle<String>::cast(type_name)); builder->AppendCharacter('.'); } if (IsNonEmptyString(method_name)) { builder->AppendString(Handle<String>::cast(method_name)); } else { builder->AppendCString("<anonymous>"); } } } } // namespace void JSStackFrame::ToString(IncrementalStringBuilder& builder) { Handle<Object> function_name = GetFunctionName(); const bool is_toplevel = IsToplevel(); const bool is_async = IsAsync(); const bool is_promise_all = IsPromiseAll(); const bool is_constructor = IsConstructor(); const bool is_method_call = !(is_toplevel || is_constructor); if (is_async) { builder.AppendCString("async "); } if (is_promise_all) { // For `Promise.all(iterable)` frames we interpret the {offset_} // as the element index into `iterable` where the error occurred. builder.AppendCString("Promise.all (index "); Handle<String> index_string = isolate_->factory()->NumberToString( handle(Smi::FromInt(offset_), isolate_), isolate_); builder.AppendString(index_string); builder.AppendCString(")"); return; } if (is_method_call) { AppendMethodCall(isolate_, this, &builder); } else if (is_constructor) { builder.AppendCString("new "); if (IsNonEmptyString(function_name)) { builder.AppendString(Handle<String>::cast(function_name)); } else { builder.AppendCString("<anonymous>"); } } else if (IsNonEmptyString(function_name)) { builder.AppendString(Handle<String>::cast(function_name)); } else { AppendFileLocation(isolate_, this, &builder); return; } builder.AppendCString(" ("); AppendFileLocation(isolate_, this, &builder); builder.AppendCString(")"); return; } int JSStackFrame::GetPosition() const { Handle<SharedFunctionInfo> shared = handle(function_->shared(), isolate_); SharedFunctionInfo::EnsureSourcePositionsAvailable(isolate_, shared); return code_->SourcePosition(offset_); } bool JSStackFrame::HasScript() const { return function_->shared()->script()->IsScript(); } Handle<Script> JSStackFrame::GetScript() const { return handle(Script::cast(function_->shared()->script()), isolate_); } void WasmStackFrame::FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix) { // This function is called for compiled and interpreted wasm frames, and for // asm.js->wasm frames. DCHECK(array->IsWasmFrame(frame_ix) || array->IsWasmInterpretedFrame(frame_ix) || array->IsAsmJsWasmFrame(frame_ix)); isolate_ = isolate; wasm_instance_ = handle(array->WasmInstance(frame_ix), isolate); wasm_func_index_ = array->WasmFunctionIndex(frame_ix)->value(); if (array->IsWasmInterpretedFrame(frame_ix)) { code_ = nullptr; } else { // The {WasmCode*} is held alive by the {GlobalWasmCodeRef}. auto global_wasm_code_ref = Managed<wasm::GlobalWasmCodeRef>::cast(array->WasmCodeObject(frame_ix)); code_ = global_wasm_code_ref->get()->code(); } offset_ = array->Offset(frame_ix)->value(); } Handle<Object> WasmStackFrame::GetReceiver() const { return wasm_instance_; } Handle<Object> WasmStackFrame::GetFunction() const { return handle(Smi::FromInt(wasm_func_index_), isolate_); } Handle<Object> WasmStackFrame::GetFunctionName() { Handle<Object> name; Handle<WasmModuleObject> module_object(wasm_instance_->module_object(), isolate_); if (!WasmModuleObject::GetFunctionNameOrNull(isolate_, module_object, wasm_func_index_) .ToHandle(&name)) { name = isolate_->factory()->null_value(); } return name; } void WasmStackFrame::ToString(IncrementalStringBuilder& builder) { Handle<WasmModuleObject> module_object(wasm_instance_->module_object(), isolate_); MaybeHandle<String> module_name = WasmModuleObject::GetModuleNameOrNull(isolate_, module_object); MaybeHandle<String> function_name = WasmModuleObject::GetFunctionNameOrNull( isolate_, module_object, wasm_func_index_); bool has_name = !module_name.is_null() || !function_name.is_null(); if (has_name) { if (module_name.is_null()) { builder.AppendString(function_name.ToHandleChecked()); } else { builder.AppendString(module_name.ToHandleChecked()); if (!function_name.is_null()) { builder.AppendCString("."); builder.AppendString(function_name.ToHandleChecked()); } } builder.AppendCString(" ("); } builder.AppendCString("wasm-function["); char buffer[16]; SNPrintF(ArrayVector(buffer), "%u]", wasm_func_index_); builder.AppendCString(buffer); SNPrintF(ArrayVector(buffer), ":%d", GetPosition()); builder.AppendCString(buffer); if (has_name) builder.AppendCString(")"); return; } int WasmStackFrame::GetPosition() const { return IsInterpreted() ? offset_ : FrameSummary::WasmCompiledFrameSummary::GetWasmSourcePosition( code_, offset_); } Handle<Object> WasmStackFrame::Null() const { return isolate_->factory()->null_value(); } bool WasmStackFrame::HasScript() const { return true; } Handle<Script> WasmStackFrame::GetScript() const { return handle(wasm_instance_->module_object()->script(), isolate_); } void AsmJsWasmStackFrame::FromFrameArray(Isolate* isolate, Handle<FrameArray> array, int frame_ix) { DCHECK(array->IsAsmJsWasmFrame(frame_ix)); WasmStackFrame::FromFrameArray(isolate, array, frame_ix); is_at_number_conversion_ = array->Flags(frame_ix)->value() & FrameArray::kAsmJsAtNumberConversion; } Handle<Object> AsmJsWasmStackFrame::GetReceiver() const { return isolate_->global_proxy(); } Handle<Object> AsmJsWasmStackFrame::GetFunction() const { // TODO(clemensh): Return lazily created JSFunction. return Null(); } Handle<Object> AsmJsWasmStackFrame::GetFileName() { Handle<Script> script(wasm_instance_->module_object()->script(), isolate_); DCHECK(script->IsUserJavaScript()); return handle(script->name(), isolate_); } Handle<Object> AsmJsWasmStackFrame::GetScriptNameOrSourceUrl() { Handle<Script> script(wasm_instance_->module_object()->script(), isolate_); DCHECK_EQ(Script::TYPE_NORMAL, script->type()); return ScriptNameOrSourceUrl(script, isolate_); } int AsmJsWasmStackFrame::GetPosition() const { DCHECK_LE(0, offset_); int byte_offset = FrameSummary::WasmCompiledFrameSummary::GetWasmSourcePosition(code_, offset_); Handle<WasmModuleObject> module_object(wasm_instance_->module_object(), isolate_); DCHECK_LE(0, byte_offset); return WasmModuleObject::GetSourcePosition(module_object, wasm_func_index_, static_cast<uint32_t>(byte_offset), is_at_number_conversion_); } int AsmJsWasmStackFrame::GetLineNumber() { DCHECK_LE(0, GetPosition()); Handle<Script> script(wasm_instance_->module_object()->script(), isolate_); DCHECK(script->IsUserJavaScript()); return Script::GetLineNumber(script, GetPosition()) + 1; } int AsmJsWasmStackFrame::GetColumnNumber() { DCHECK_LE(0, GetPosition()); Handle<Script> script(wasm_instance_->module_object()->script(), isolate_); DCHECK(script->IsUserJavaScript()); return Script::GetColumnNumber(script, GetPosition()) + 1; } void AsmJsWasmStackFrame::ToString(IncrementalStringBuilder& builder) { // The string should look exactly as the respective javascript frame string. // Keep this method in line to // JSStackFrame::ToString(IncrementalStringBuilder&). Handle<Object> function_name = GetFunctionName(); if (IsNonEmptyString(function_name)) { builder.AppendString(Handle<String>::cast(function_name)); builder.AppendCString(" ("); } AppendFileLocation(isolate_, this, &builder); if (IsNonEmptyString(function_name)) builder.AppendCString(")"); return; } FrameArrayIterator::FrameArrayIterator(Isolate* isolate, Handle<FrameArray> array, int frame_ix) : isolate_(isolate), array_(array), frame_ix_(frame_ix) {} bool FrameArrayIterator::HasFrame() const { return (frame_ix_ < array_->FrameCount()); } void FrameArrayIterator::Advance() { frame_ix_++; } StackFrameBase* FrameArrayIterator::Frame() { DCHECK(HasFrame()); const int flags = array_->Flags(frame_ix_)->value(); int flag_mask = FrameArray::kIsWasmFrame | FrameArray::kIsWasmInterpretedFrame | FrameArray::kIsAsmJsWasmFrame; switch (flags & flag_mask) { case 0: // JavaScript Frame. js_frame_.FromFrameArray(isolate_, array_, frame_ix_); return &js_frame_; case FrameArray::kIsWasmFrame: case FrameArray::kIsWasmInterpretedFrame: // Wasm Frame: wasm_frame_.FromFrameArray(isolate_, array_, frame_ix_); return &wasm_frame_; case FrameArray::kIsAsmJsWasmFrame: // Asm.js Wasm Frame: asm_wasm_frame_.FromFrameArray(isolate_, array_, frame_ix_); return &asm_wasm_frame_; default: UNREACHABLE(); } } namespace { MaybeHandle<Object> ConstructCallSite(Isolate* isolate, Handle<FrameArray> frame_array, int frame_index) { Handle<JSFunction> target = handle(isolate->native_context()->callsite_function(), isolate); Handle<JSObject> obj; ASSIGN_RETURN_ON_EXCEPTION( isolate, obj, JSObject::New(target, target, Handle<AllocationSite>::null()), Object); Handle<Symbol> key = isolate->factory()->call_site_frame_array_symbol(); RETURN_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( obj, key, frame_array, DONT_ENUM), Object); key = isolate->factory()->call_site_frame_index_symbol(); Handle<Object> value(Smi::FromInt(frame_index), isolate); RETURN_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( obj, key, value, DONT_ENUM), Object); return obj; } // Convert the raw frames as written by Isolate::CaptureSimpleStackTrace into // a JSArray of JSCallSite objects. MaybeHandle<JSArray> GetStackFrames(Isolate* isolate, Handle<FrameArray> elems) { const int frame_count = elems->FrameCount(); Handle<FixedArray> frames = isolate->factory()->NewFixedArray(frame_count); for (int i = 0; i < frame_count; i++) { Handle<Object> site; ASSIGN_RETURN_ON_EXCEPTION(isolate, site, ConstructCallSite(isolate, elems, i), JSArray); frames->set(i, *site); } return isolate->factory()->NewJSArrayWithElements(frames); } MaybeHandle<Object> AppendErrorString(Isolate* isolate, Handle<Object> error, IncrementalStringBuilder* builder) { MaybeHandle<String> err_str = ErrorUtils::ToString(isolate, Handle<Object>::cast(error)); if (err_str.is_null()) { // Error.toString threw. Try to return a string representation of the thrown // exception instead. DCHECK(isolate->has_pending_exception()); Handle<Object> pending_exception = handle(isolate->pending_exception(), isolate); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); err_str = ErrorUtils::ToString(isolate, pending_exception); if (err_str.is_null()) { // Formatting the thrown exception threw again, give up. DCHECK(isolate->has_pending_exception()); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); builder->AppendCString("<error>"); } else { // Formatted thrown exception successfully, append it. builder->AppendCString("<error: "); builder->AppendString(err_str.ToHandleChecked()); builder->AppendCharacter('>'); } } else { builder->AppendString(err_str.ToHandleChecked()); } return error; } class PrepareStackTraceScope { public: explicit PrepareStackTraceScope(Isolate* isolate) : isolate_(isolate) { DCHECK(!isolate_->formatting_stack_trace()); isolate_->set_formatting_stack_trace(true); } ~PrepareStackTraceScope() { isolate_->set_formatting_stack_trace(false); } private: Isolate* isolate_; DISALLOW_COPY_AND_ASSIGN(PrepareStackTraceScope); }; } // namespace // static MaybeHandle<Object> ErrorUtils::FormatStackTrace(Isolate* isolate, Handle<JSObject> error, Handle<Object> raw_stack) { DCHECK(raw_stack->IsFixedArray()); Handle<FrameArray> elems = Handle<FrameArray>::cast(raw_stack); const bool in_recursion = isolate->formatting_stack_trace(); if (!in_recursion) { if (isolate->HasPrepareStackTraceCallback()) { Handle<Context> error_context = error->GetCreationContext(); DCHECK(!error_context.is_null() && error_context->IsNativeContext()); PrepareStackTraceScope scope(isolate); Handle<JSArray> sites; ASSIGN_RETURN_ON_EXCEPTION(isolate, sites, GetStackFrames(isolate, elems), Object); Handle<Object> result; ASSIGN_RETURN_ON_EXCEPTION( isolate, result, isolate->RunPrepareStackTraceCallback(error_context, error, sites), Object); return result; } else { Handle<JSFunction> global_error = isolate->error_function(); // If there's a user-specified "prepareStackTrace" function, call it on // the frames and use its result. Handle<Object> prepare_stack_trace; ASSIGN_RETURN_ON_EXCEPTION( isolate, prepare_stack_trace, JSFunction::GetProperty(isolate, global_error, "prepareStackTrace"), Object); if (prepare_stack_trace->IsJSFunction()) { PrepareStackTraceScope scope(isolate); isolate->CountUsage(v8::Isolate::kErrorPrepareStackTrace); Handle<JSArray> sites; ASSIGN_RETURN_ON_EXCEPTION(isolate, sites, GetStackFrames(isolate, elems), Object); const int argc = 2; ScopedVector<Handle<Object>> argv(argc); argv[0] = error; argv[1] = sites; Handle<Object> result; ASSIGN_RETURN_ON_EXCEPTION( isolate, result, Execution::Call(isolate, prepare_stack_trace, global_error, argc, argv.begin()), Object); return result; } } } // Otherwise, run our internal formatting logic. IncrementalStringBuilder builder(isolate); RETURN_ON_EXCEPTION(isolate, AppendErrorString(isolate, error, &builder), Object); wasm::WasmCodeRefScope wasm_code_ref_scope; for (FrameArrayIterator it(isolate, elems); it.HasFrame(); it.Advance()) { builder.AppendCString("\n at "); StackFrameBase* frame = it.Frame(); frame->ToString(builder); if (isolate->has_pending_exception()) { // CallSite.toString threw. Parts of the current frame might have been // stringified already regardless. Still, try to append a string // representation of the thrown exception. Handle<Object> pending_exception = handle(isolate->pending_exception(), isolate); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); MaybeHandle<String> exception_string = ErrorUtils::ToString(isolate, pending_exception); if (exception_string.is_null()) { // Formatting the thrown exception threw again, give up. builder.AppendCString("<error>"); } else { // Formatted thrown exception successfully, append it. builder.AppendCString("<error: "); builder.AppendString(exception_string.ToHandleChecked()); builder.AppendCString("<error>"); } } } return builder.Finish(); } Handle<String> MessageFormatter::Format(Isolate* isolate, MessageTemplate index, Handle<Object> arg) { Factory* factory = isolate->factory(); Handle<String> result_string = Object::NoSideEffectsToString(isolate, arg); MaybeHandle<String> maybe_result_string = MessageFormatter::Format( isolate, index, result_string, factory->empty_string(), factory->empty_string()); if (!maybe_result_string.ToHandle(&result_string)) { DCHECK(isolate->has_pending_exception()); isolate->clear_pending_exception(); return factory->InternalizeOneByteString(StaticCharVector("<error>")); } // A string that has been obtained from JS code in this way is // likely to be a complicated ConsString of some sort. We flatten it // here to improve the efficiency of converting it to a C string and // other operations that are likely to take place (see GetLocalizedMessage // for example). return String::Flatten(isolate, result_string); } const char* MessageFormatter::TemplateString(MessageTemplate index) { switch (index) { #define CASE(NAME, STRING) \ case MessageTemplate::k##NAME: \ return STRING; MESSAGE_TEMPLATES(CASE) #undef CASE case MessageTemplate::kLastMessage: default: return nullptr; } } MaybeHandle<String> MessageFormatter::Format(Isolate* isolate, MessageTemplate index, Handle<String> arg0, Handle<String> arg1, Handle<String> arg2) { const char* template_string = TemplateString(index); if (template_string == nullptr) { isolate->ThrowIllegalOperation(); return MaybeHandle<String>(); } IncrementalStringBuilder builder(isolate); unsigned int i = 0; Handle<String> args[] = {arg0, arg1, arg2}; for (const char* c = template_string; *c != '\0'; c++) { if (*c == '%') { // %% results in verbatim %. if (*(c + 1) == '%') { c++; builder.AppendCharacter('%'); } else { DCHECK(i < arraysize(args)); Handle<String> arg = args[i++]; builder.AppendString(arg); } } else { builder.AppendCharacter(*c); } } return builder.Finish(); } MaybeHandle<Object> ErrorUtils::Construct( Isolate* isolate, Handle<JSFunction> target, Handle<Object> new_target, Handle<Object> message, FrameSkipMode mode, Handle<Object> caller, bool suppress_detailed_trace) { // 1. If NewTarget is undefined, let newTarget be the active function object, // else let newTarget be NewTarget. Handle<JSReceiver> new_target_recv = new_target->IsJSReceiver() ? Handle<JSReceiver>::cast(new_target) : Handle<JSReceiver>::cast(target); // 2. Let O be ? OrdinaryCreateFromConstructor(newTarget, "%ErrorPrototype%", // « [[ErrorData]] »). Handle<JSObject> err; ASSIGN_RETURN_ON_EXCEPTION( isolate, err, JSObject::New(target, new_target_recv, Handle<AllocationSite>::null()), Object); // 3. If message is not undefined, then // a. Let msg be ? ToString(message). // b. Let msgDesc be the PropertyDescriptor{[[Value]]: msg, [[Writable]]: // true, [[Enumerable]]: false, [[Configurable]]: true}. // c. Perform ! DefinePropertyOrThrow(O, "message", msgDesc). // 4. Return O. if (!message->IsUndefined(isolate)) { Handle<String> msg_string; ASSIGN_RETURN_ON_EXCEPTION(isolate, msg_string, Object::ToString(isolate, message), Object); RETURN_ON_EXCEPTION(isolate, JSObject::SetOwnPropertyIgnoreAttributes( err, isolate->factory()->message_string(), msg_string, DONT_ENUM), Object); } // Optionally capture a more detailed stack trace for the message. if (!suppress_detailed_trace) { RETURN_ON_EXCEPTION(isolate, isolate->CaptureAndSetDetailedStackTrace(err), Object); } // Capture a simple stack trace for the stack property. RETURN_ON_EXCEPTION(isolate, isolate->CaptureAndSetSimpleStackTrace(err, mode, caller), Object); return err; } namespace { MaybeHandle<String> GetStringPropertyOrDefault(Isolate* isolate, Handle<JSReceiver> recv, Handle<String> key, Handle<String> default_str) { Handle<Object> obj; ASSIGN_RETURN_ON_EXCEPTION(isolate, obj, JSObject::GetProperty(isolate, recv, key), String); Handle<String> str; if (obj->IsUndefined(isolate)) { str = default_str; } else { ASSIGN_RETURN_ON_EXCEPTION(isolate, str, Object::ToString(isolate, obj), String); } return str; } } // namespace // ES6 section 19.5.3.4 Error.prototype.toString ( ) MaybeHandle<String> ErrorUtils::ToString(Isolate* isolate, Handle<Object> receiver) { // 1. Let O be the this value. // 2. If Type(O) is not Object, throw a TypeError exception. if (!receiver->IsJSReceiver()) { return isolate->Throw<String>(isolate->factory()->NewTypeError( MessageTemplate::kIncompatibleMethodReceiver, isolate->factory()->NewStringFromAsciiChecked( "Error.prototype.toString"), receiver)); } Handle<JSReceiver> recv = Handle<JSReceiver>::cast(receiver); // 3. Let name be ? Get(O, "name"). // 4. If name is undefined, let name be "Error"; otherwise let name be // ? ToString(name). Handle<String> name_key = isolate->factory()->name_string(); Handle<String> name_default = isolate->factory()->Error_string(); Handle<String> name; ASSIGN_RETURN_ON_EXCEPTION( isolate, name, GetStringPropertyOrDefault(isolate, recv, name_key, name_default), String); // 5. Let msg be ? Get(O, "message"). // 6. If msg is undefined, let msg be the empty String; otherwise let msg be // ? ToString(msg). Handle<String> msg_key = isolate->factory()->message_string(); Handle<String> msg_default = isolate->factory()->empty_string(); Handle<String> msg; ASSIGN_RETURN_ON_EXCEPTION( isolate, msg, GetStringPropertyOrDefault(isolate, recv, msg_key, msg_default), String); // 7. If name is the empty String, return msg. // 8. If msg is the empty String, return name. if (name->length() == 0) return msg; if (msg->length() == 0) return name; // 9. Return the result of concatenating name, the code unit 0x003A (COLON), // the code unit 0x0020 (SPACE), and msg. IncrementalStringBuilder builder(isolate); builder.AppendString(name); builder.AppendCString(": "); builder.AppendString(msg); Handle<String> result; ASSIGN_RETURN_ON_EXCEPTION(isolate, result, builder.Finish(), String); return result; } namespace { Handle<String> DoFormatMessage(Isolate* isolate, MessageTemplate index, Handle<Object> arg0, Handle<Object> arg1, Handle<Object> arg2) { Handle<String> arg0_str = Object::NoSideEffectsToString(isolate, arg0); Handle<String> arg1_str = Object::NoSideEffectsToString(isolate, arg1); Handle<String> arg2_str = Object::NoSideEffectsToString(isolate, arg2); isolate->native_context()->IncrementErrorsThrown(); Handle<String> msg; if (!MessageFormatter::Format(isolate, index, arg0_str, arg1_str, arg2_str) .ToHandle(&msg)) { DCHECK(isolate->has_pending_exception()); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); return isolate->factory()->NewStringFromAsciiChecked("<error>"); } return msg; } } // namespace // static MaybeHandle<Object> ErrorUtils::MakeGenericError( Isolate* isolate, Handle<JSFunction> constructor, MessageTemplate index, Handle<Object> arg0, Handle<Object> arg1, Handle<Object> arg2, FrameSkipMode mode) { if (FLAG_clear_exceptions_on_js_entry) { // This function used to be implemented in JavaScript, and JSEntry // clears any pending exceptions - so whenever we'd call this from C++, // pending exceptions would be cleared. Preserve this behavior. isolate->clear_pending_exception(); } Handle<String> msg; if (FLAG_correctness_fuzzer_suppressions) { // Ignore error messages in correctness fuzzing, because the spec leaves // room for undefined behavior. msg = isolate->factory()->InternalizeUtf8String( "Message suppressed for fuzzers (--correctness-fuzzer-suppressions)"); } else { msg = DoFormatMessage(isolate, index, arg0, arg1, arg2); } DCHECK(mode != SKIP_UNTIL_SEEN); Handle<Object> no_caller; return ErrorUtils::Construct(isolate, constructor, constructor, msg, mode, no_caller, false); } } // namespace internal } // namespace v8