v8/src/messages.cc
2010-10-25 15:22:03 +00:00

184 lines
6.8 KiB
C++

// Copyright 2006-2008 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"
#include "top.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) {
SmartPointer<char> str = GetLocalizedMessage(message_obj);
if (loc == NULL) {
PrintF("%s\n", *str);
} else {
HandleScope scope;
Handle<Object> data(loc->script()->name());
SmartPointer<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);
}
}
void MessageHandler::ReportMessage(const char* msg) {
PrintF("%s\n", msg);
}
Handle<Object> MessageHandler::MakeMessageObject(
const char* type,
MessageLocation* loc,
Vector< Handle<Object> > args,
Handle<String> stack_trace,
Handle<JSArray> stack_frames) {
// Build error message object
v8::HandleScope scope; // Instantiate a closeable HandleScope for EscapeFrom.
Handle<Object> type_str = Factory::LookupAsciiSymbol(type);
Handle<Object> array = Factory::NewJSArray(args.length());
for (int i = 0; i < args.length(); i++)
SetElement(Handle<JSArray>::cast(array), i, args[i]);
Handle<JSFunction> fun(Top::global_context()->make_message_fun());
int start, end;
Handle<Object> script;
if (loc) {
start = loc->start_pos();
end = loc->end_pos();
script = GetScriptWrapper(loc->script());
} else {
start = end = 0;
script = Factory::undefined_value();
}
Handle<Object> start_handle(Smi::FromInt(start));
Handle<Object> end_handle(Smi::FromInt(end));
Handle<Object> stack_trace_val = stack_trace.is_null()
? Factory::undefined_value()
: Handle<Object>::cast(stack_trace);
Handle<Object> stack_frames_val = stack_frames.is_null()
? Factory::undefined_value()
: Handle<Object>::cast(stack_frames);
const int argc = 7;
Object** argv[argc] = { type_str.location(),
array.location(),
start_handle.location(),
end_handle.location(),
script.location(),
stack_trace_val.location(),
stack_frames_val.location() };
// Setup a catch handler to catch exceptions in creating the message. This
// handler is non-verbose to avoid calling MakeMessage recursively in case of
// an exception.
v8::TryCatch catcher;
catcher.SetVerbose(false);
catcher.SetCaptureMessage(false);
// Format the message.
bool caught_exception = false;
Handle<Object> message =
Execution::Call(fun, Factory::undefined_value(), argc, argv,
&caught_exception);
// If creating the message (in JS code) resulted in an exception, we
// skip doing the callback. This usually only happens in case of
// stack overflow exceptions being thrown by the parser when the
// stack is almost full.
if (caught_exception) return Handle<Object>();
return message.EscapeFrom(&scope);
}
void MessageHandler::ReportMessage(MessageLocation* loc,
Handle<Object> message) {
v8::Local<v8::Message> api_message_obj = v8::Utils::MessageToLocal(message);
v8::NeanderArray global_listeners(Factory::message_listeners());
int global_length = global_listeners.length();
if (global_length == 0) {
DefaultMessageReport(loc, message);
} else {
for (int i = 0; i < global_length; i++) {
HandleScope scope;
if (global_listeners.get(i)->IsUndefined()) continue;
v8::NeanderObject listener(JSObject::cast(global_listeners.get(i)));
Handle<Proxy> callback_obj(Proxy::cast(listener.get(0)));
v8::MessageCallback callback =
FUNCTION_CAST<v8::MessageCallback>(callback_obj->proxy());
Handle<Object> callback_data(listener.get(1));
callback(api_message_obj, v8::Utils::ToLocal(callback_data));
}
}
}
Handle<String> MessageHandler::GetMessage(Handle<Object> data) {
Handle<String> fmt_str = Factory::LookupAsciiSymbol("FormatMessage");
Handle<JSFunction> fun =
Handle<JSFunction>(JSFunction::cast(
Top::builtins()->GetPropertyNoExceptionThrown(*fmt_str)));
Object** argv[1] = { data.location() };
bool caught_exception;
Handle<Object> result =
Execution::TryCall(fun, Top::builtins(), 1, 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;
}
SmartPointer<char> MessageHandler::GetLocalizedMessage(Handle<Object> data) {
HandleScope scope;
return GetMessage(data)->ToCString(DISALLOW_NULLS);
}
} } // namespace v8::internal