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// 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/v8.h"
#include "src/api.h"
#include "src/execution.h"
#include "src/heap/spaces-inl.h"
#include "src/messages.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.get());
} 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.get() ? data_str.get() : "<unknown>",
loc->start_pos(), str.get());
}
}
Handle<JSMessageObject> MessageHandler::MakeMessageObject(
Isolate* isolate,
const char* type,
MessageLocation* loc,
Vector< Handle<Object> > args,
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 = Script::GetWrapper(loc->script());
}
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_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()) {
exception_object = isolate->pending_exception();
}
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>::cast(Object::GetProperty(
isolate->js_builtins_object(), fmt_str).ToHandleChecked());
Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data);
Handle<Object> argv[] = { Handle<Object>(message->type(), isolate),
Handle<Object>(message->arguments(), isolate) };
MaybeHandle<Object> maybe_result = Execution::TryCall(
fun, isolate->js_builtins_object(), ARRAY_SIZE(argv), argv);
Handle<Object> result;
if (!maybe_result.ToHandle(&result) || !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).
result_string = String::Flatten(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
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