4e670fd05e
R=dcarney@chromium.org, marja@chromium.org Review URL: https://codereview.chromium.org/559913002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23840 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
166 lines
6.0 KiB
C++
166 lines
6.0 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/v8.h"
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#include "src/api.h"
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#include "src/execution.h"
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#include "src/heap/spaces-inl.h"
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#include "src/messages.h"
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namespace v8 {
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namespace internal {
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// If no message listeners have been registered this one is called
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// by default.
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void MessageHandler::DefaultMessageReport(Isolate* isolate,
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const MessageLocation* loc,
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Handle<Object> message_obj) {
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SmartArrayPointer<char> str = GetLocalizedMessage(isolate, message_obj);
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if (loc == NULL) {
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PrintF("%s\n", str.get());
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} else {
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HandleScope scope(isolate);
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Handle<Object> data(loc->script()->name(), isolate);
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SmartArrayPointer<char> data_str;
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if (data->IsString())
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data_str = Handle<String>::cast(data)->ToCString(DISALLOW_NULLS);
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PrintF("%s:%i: %s\n", data_str.get() ? data_str.get() : "<unknown>",
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loc->start_pos(), str.get());
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}
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}
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Handle<JSMessageObject> MessageHandler::MakeMessageObject(
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Isolate* isolate,
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const char* type,
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MessageLocation* loc,
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Vector< Handle<Object> > args,
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Handle<JSArray> stack_frames) {
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Factory* factory = isolate->factory();
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Handle<String> type_handle = factory->InternalizeUtf8String(type);
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Handle<FixedArray> arguments_elements =
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factory->NewFixedArray(args.length());
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for (int i = 0; i < args.length(); i++) {
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arguments_elements->set(i, *args[i]);
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}
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Handle<JSArray> arguments_handle =
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factory->NewJSArrayWithElements(arguments_elements);
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int start = 0;
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int end = 0;
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Handle<Object> script_handle = factory->undefined_value();
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if (loc) {
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start = loc->start_pos();
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end = loc->end_pos();
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script_handle = Script::GetWrapper(loc->script());
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}
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Handle<Object> stack_frames_handle = stack_frames.is_null()
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? Handle<Object>::cast(factory->undefined_value())
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: Handle<Object>::cast(stack_frames);
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Handle<JSMessageObject> message =
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factory->NewJSMessageObject(type_handle,
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arguments_handle,
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start,
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end,
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script_handle,
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stack_frames_handle);
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return message;
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}
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void MessageHandler::ReportMessage(Isolate* isolate,
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MessageLocation* loc,
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Handle<Object> message) {
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// We are calling into embedder's code which can throw exceptions.
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// Thus we need to save current exception state, reset it to the clean one
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// and ignore scheduled exceptions callbacks can throw.
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// We pass the exception object into the message handler callback though.
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Object* exception_object = isolate->heap()->undefined_value();
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if (isolate->has_pending_exception()) {
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exception_object = isolate->pending_exception();
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}
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Handle<Object> exception_handle(exception_object, isolate);
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Isolate::ExceptionScope exception_scope(isolate);
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isolate->clear_pending_exception();
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isolate->set_external_caught_exception(false);
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v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
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v8::Local<v8::Value> api_exception_obj = v8::Utils::ToLocal(exception_handle);
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v8::NeanderArray global_listeners(isolate->factory()->message_listeners());
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int global_length = global_listeners.length();
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if (global_length == 0) {
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DefaultMessageReport(isolate, loc, message);
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if (isolate->has_scheduled_exception()) {
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isolate->clear_scheduled_exception();
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}
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} else {
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for (int i = 0; i < global_length; i++) {
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HandleScope scope(isolate);
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if (global_listeners.get(i)->IsUndefined()) continue;
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v8::NeanderObject listener(JSObject::cast(global_listeners.get(i)));
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Handle<Foreign> callback_obj(Foreign::cast(listener.get(0)));
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v8::MessageCallback callback =
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FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address());
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Handle<Object> callback_data(listener.get(1), isolate);
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{
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// Do not allow exceptions to propagate.
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v8::TryCatch try_catch;
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callback(api_message_obj, callback_data->IsUndefined()
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? api_exception_obj
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: v8::Utils::ToLocal(callback_data));
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}
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if (isolate->has_scheduled_exception()) {
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isolate->clear_scheduled_exception();
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}
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}
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}
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}
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Handle<String> MessageHandler::GetMessage(Isolate* isolate,
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Handle<Object> data) {
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Factory* factory = isolate->factory();
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Handle<String> fmt_str =
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factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("FormatMessage"));
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Handle<JSFunction> fun = Handle<JSFunction>::cast(Object::GetProperty(
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isolate->js_builtins_object(), fmt_str).ToHandleChecked());
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Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data);
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Handle<Object> argv[] = { Handle<Object>(message->type(), isolate),
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Handle<Object>(message->arguments(), isolate) };
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MaybeHandle<Object> maybe_result = Execution::TryCall(
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fun, isolate->js_builtins_object(), arraysize(argv), argv);
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Handle<Object> result;
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if (!maybe_result.ToHandle(&result) || !result->IsString()) {
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return factory->InternalizeOneByteString(STATIC_CHAR_VECTOR("<error>"));
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}
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Handle<String> result_string = Handle<String>::cast(result);
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// A string that has been obtained from JS code in this way is
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// likely to be a complicated ConsString of some sort. We flatten it
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// here to improve the efficiency of converting it to a C string and
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// other operations that are likely to take place (see GetLocalizedMessage
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// for example).
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result_string = String::Flatten(result_string);
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return result_string;
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}
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SmartArrayPointer<char> MessageHandler::GetLocalizedMessage(
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Isolate* isolate,
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Handle<Object> data) {
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HandleScope scope(isolate);
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return GetMessage(isolate, data)->ToCString(DISALLOW_NULLS);
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}
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} } // namespace v8::internal
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