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// 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(const MessageLocation* loc,
Handle<Object> message_obj) {
SmartArrayPointer<char> str = GetLocalizedMessage(message_obj);
if (loc == NULL) {
PrintF("%s\n", *str);
} else {
HandleScope scope;
Handle<Object> data(loc->script()->name());
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(
const char* type,
MessageLocation* loc,
Vector< Handle<Object> > args,
Handle<String> stack_trace,
Handle<JSArray> stack_frames) {
Handle<String> type_handle = FACTORY->LookupAsciiSymbol(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::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(FACTORY->message_listeners());
int global_length = global_listeners.length();
if (global_length == 0) {
DefaultMessageReport(loc, message);
if (isolate->has_scheduled_exception()) {
isolate->clear_scheduled_exception();
}
} else {
for (int i = 0; i < global_length; i++) {
HandleScope scope;
if (global_listeners.get(i)->IsUndefined()) continue;
Handle<Foreign> callback_obj(Foreign::cast(global_listeners.get(i)));
v8::MessageCallback callback =
FUNCTION_CAST<v8::MessageCallback>(callback_obj->foreign_address());
{
// Do not allow exceptions to propagate.
v8::TryCatch try_catch;
callback(api_message_obj, api_exception_obj);
}
if (isolate->has_scheduled_exception()) {
isolate->clear_scheduled_exception();
}
}
}
}
Handle<String> MessageHandler::GetMessage(Handle<Object> data) {
Handle<String> fmt_str = FACTORY->LookupAsciiSymbol("FormatMessage");
Handle<JSFunction> fun =
Handle<JSFunction>(
JSFunction::cast(
Isolate::Current()->js_builtins_object()->
GetPropertyNoExceptionThrown(*fmt_str)));
Handle<JSMessageObject> message = Handle<JSMessageObject>::cast(data);
Handle<Object> argv[] = { Handle<Object>(message->type()),
Handle<Object>(message->arguments()) };
bool caught_exception;
Handle<Object> result =
Execution::TryCall(fun,
Isolate::Current()->js_builtins_object(),
ARRAY_SIZE(argv),
argv,
&caught_exception);
if (caught_exception || !result->IsString()) {
return FACTORY->LookupAsciiSymbol("<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(
Handle<Object> data) {
HandleScope scope;
return GetMessage(data)->ToCString(DISALLOW_NULLS);
}
} } // namespace v8::internal
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