// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include "v8.h" #include "api.h" #include "execution.h" #include "messages.h" #include "spaces-inl.h" namespace v8 { namespace internal { // 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) { SmartArrayPointer<char> str = GetLocalizedMessage(isolate, message_obj); if (loc == NULL) { PrintF("%s\n", *str); } else { HandleScope scope(isolate); Handle<Object> data(loc->script()->name(), isolate); SmartArrayPointer<char> data_str; if (data->IsString()) data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS); PrintF("%s:%i: %s\n", *data_str ? *data_str : "<unknown>", loc->start_pos(), *str); } } Handle<JSMessageObject> MessageHandler::MakeMessageObject( Isolate* isolate, const char* type, MessageLocation* loc, Vector< Handle<Object> > args, Handle<String> stack_trace, Handle<JSArray> stack_frames) { Factory* factory = isolate->factory(); Handle<String> type_handle = factory->InternalizeUtf8String(type); Handle<FixedArray> arguments_elements = factory->NewFixedArray(args.length()); for (int i = 0; i < args.length(); i++) { arguments_elements->set(i, *args[i]); } Handle<JSArray> arguments_handle = factory->NewJSArrayWithElements(arguments_elements); int start = 0; int end = 0; Handle<Object> script_handle = factory->undefined_value(); if (loc) { start = loc->start_pos(); end = loc->end_pos(); script_handle = GetScriptWrapper(loc->script()); } Handle<Object> stack_trace_handle = stack_trace.is_null() ? Handle<Object>::cast(factory->undefined_value()) : Handle<Object>::cast(stack_trace); Handle<Object> stack_frames_handle = stack_frames.is_null() ? Handle<Object>::cast(factory->undefined_value()) : Handle<Object>::cast(stack_frames); Handle<JSMessageObject> message = factory->NewJSMessageObject(type_handle, arguments_handle, start, end, script_handle, stack_trace_handle, stack_frames_handle); return message; } void MessageHandler::ReportMessage(Isolate* isolate, MessageLocation* loc, Handle<Object> message) { // 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 = isolate->heap()->undefined_value(); if (isolate->has_pending_exception()) { isolate->pending_exception()->ToObject(&exception_object); } Handle<Object> exception_handle(exception_object, isolate); Isolate::ExceptionScope exception_scope(isolate); isolate->clear_pending_exception(); isolate->set_external_caught_exception(false); v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message); v8::Local<v8::Value> api_exception_obj = v8::Utils::ToLocal(exception_handle); v8::NeanderArray 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()) continue; v8::NeanderObject listener(JSObject::cast(global_listeners.get(i))); Handle<Foreign> callback_obj(Foreign::cast(listener.get(0))); v8::MessageCallback callback = FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address()); Handle<Object> callback_data(listener.get(1), isolate); { // Do not allow exceptions to propagate. v8::TryCatch try_catch; callback(api_message_obj, callback_data->IsUndefined() ? 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) { Factory* factory = isolate->factory(); Handle<String> fmt_str = factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("FormatMessage")); Handle<JSFunction> fun = Handle<JSFunction>( JSFunction::cast( isolate->js_builtins_object()-> GetPropertyNoExceptionThrown(*fmt_str))); Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data); Handle<Object> argv[] = { Handle<Object>(message->type(), isolate), Handle<Object>(message->arguments(), isolate) }; bool caught_exception; Handle<Object> result = Execution::TryCall(fun, isolate->js_builtins_object(), ARRAY_SIZE(argv), argv, &caught_exception); if (caught_exception || !result->IsString()) { return factory->InternalizeOneByteString(STATIC_ASCII_VECTOR("<error>")); } Handle<String> result_string = Handle<String>::cast(result); // 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). FlattenString(result_string); return result_string; } SmartArrayPointer<char> MessageHandler::GetLocalizedMessage( Isolate* isolate, Handle<Object> data) { HandleScope scope(isolate); return GetMessage(isolate, data)->ToCString(DISALLOW_NULLS); } } } // namespace v8::internal