static void V8ErrorMessageCallback(v8::Handle<v8::Message> message,
v8::Handle<v8::Value> data)
{
v8::HandleScope handle_scope;
std::string error =
+ " Javascript error on line " + OSS::string_from_number(message->GetLineNumber())
+ " : " + toString(message->GetSourceLine());
OSS::log_error(error);
}
static void AppendExceptionLine(Environment* env, v8::Handle<v8::Value> er, v8::Handle<v8::Message> message)
{
if (message.IsEmpty())
return;
v8::HandleScope scope(env->isolate());
v8::Local<v8::Object> err_obj;
if (!er.IsEmpty() && er->IsObject()) {
err_obj = er.As<v8::Object>();
// Do it only once per message
if (!err_obj->GetHiddenValue(env->processed_string()).IsEmpty())
return;
err_obj->SetHiddenValue(env->processed_string(), True(env->isolate()));
}
static char arrow[1024];
// Print (filename):(line number): (message).
v8::String::Utf8Value filename(message->GetScriptResourceName());
const char* filename_string = *filename;
int linenum = message->GetLineNumber();
// Print line of source code.
v8::String::Utf8Value sourceline(message->GetSourceLine());
const char* sourceline_string = *sourceline;
// Because of how node modules work, all scripts are wrapped with a
// "function (module, exports, __filename, ...) {"
// to provide script local variables.
//
// When reporting errors on the first line of a script, this wrapper
// function is leaked to the user. There used to be a hack here to
// truncate off the first 62 characters, but it caused numerous other
// problems when vm.runIn*Context() methods were used for non-module
// code.
//
// If we ever decide to re-instate such a hack, the following steps
// must be taken:
//
// 1. Pass a flag around to say "this code was wrapped"
// 2. Update the stack frame output so that it is also correct.
//
// It would probably be simpler to add a line rather than add some
// number of characters to the first line, since V8 truncates the
// sourceline to 78 characters, and we end up not providing very much
// useful debugging info to the user if we remove 62 characters.
int start = message->GetStartColumn();
int end = message->GetEndColumn();
int off = snprintf(arrow, sizeof(arrow), "%s:%i\n%s\n", filename_string, linenum, sourceline_string);
assert(off >= 0);
// Print wavy underline (GetUnderline is deprecated).
for (int i = 0; i < start; i++) {
if (sourceline_string[i] == '\0' || static_cast<size_t>(off) >= sizeof(arrow)) {
break;
}
assert(static_cast<size_t>(off) < sizeof(arrow));
arrow[off++] = (sourceline_string[i] == '\t') ? '\t' : ' ';
}
for (int i = start; i < end; i++) {
if (sourceline_string[i] == '\0' || static_cast<size_t>(off) >= sizeof(arrow)) {
break;
}
assert(static_cast<size_t>(off) < sizeof(arrow));
arrow[off++] = '^';
}
assert(static_cast<size_t>(off - 1) <= sizeof(arrow) - 1);
arrow[off++] = '\n';
arrow[off] = '\0';
v8::Local<v8::String> arrow_str = v8::String::NewFromUtf8(env->isolate(), arrow);
v8::Local<v8::Value> msg;
v8::Local<v8::Value> stack;
// Allocation failed, just print it out
if (arrow_str.IsEmpty() || err_obj.IsEmpty() || !err_obj->IsNativeError())
goto print;
msg = err_obj->Get(env->message_string());
stack = err_obj->Get(env->stack_string());
if (msg.IsEmpty() || stack.IsEmpty())
goto print;
err_obj->Set(env->message_string(), v8::String::Concat(arrow_str, msg->ToString()));
err_obj->Set(env->stack_string(), v8::String::Concat(arrow_str, stack->ToString()));
return;
print: if (env->printed_error())
return;
env->set_printed_error(true);
// uv_tty_reset_mode();
fprintf(stderr, "\n%s", arrow);
}