v8/src/d8-debug.cc

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// Copyright 2012 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 "d8.h"
#include "d8-debug.h"
namespace v8 {
void PrintPrompt(bool is_running) {
const char* prompt = is_running? "> " : "dbg> ";
printf("%s", prompt);
fflush(stdout);
}
void HandleDebugEvent(const Debug::EventDetails& event_details) {
// TODO(svenpanne) There should be a way to retrieve this in the callback.
Isolate* isolate = Isolate::GetCurrent();
HandleScope scope(isolate);
DebugEvent event = event_details.GetEvent();
// Check for handled event.
if (event != Break && event != Exception && event != AfterCompile) {
return;
}
TryCatch try_catch;
// Get the toJSONProtocol function on the event and get the JSON format.
Local<String> to_json_fun_name =
String::NewFromUtf8(isolate, "toJSONProtocol");
Handle<Object> event_data = event_details.GetEventData();
Local<Function> to_json_fun =
Local<Function>::Cast(event_data->Get(to_json_fun_name));
Local<Value> event_json = to_json_fun->Call(event_data, 0, NULL);
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
return;
}
// Print the event details.
Handle<Object> details =
Shell::DebugMessageDetails(isolate, Handle<String>::Cast(event_json));
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
return;
}
String::Utf8Value str(details->Get(String::NewFromUtf8(isolate, "text")));
if (str.length() == 0) {
// Empty string is used to signal not to process this event.
return;
}
printf("%s\n", *str);
// Get the debug command processor.
Local<String> fun_name =
String::NewFromUtf8(isolate, "debugCommandProcessor");
Handle<Object> exec_state = event_details.GetExecutionState();
Local<Function> fun = Local<Function>::Cast(exec_state->Get(fun_name));
Local<Object> cmd_processor =
Local<Object>::Cast(fun->Call(exec_state, 0, NULL));
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
return;
}
static const int kBufferSize = 256;
bool running = false;
while (!running) {
char command[kBufferSize];
PrintPrompt(running);
char* str = fgets(command, kBufferSize, stdin);
if (str == NULL) break;
// Ignore empty commands.
if (strlen(command) == 0) continue;
TryCatch try_catch;
// Convert the debugger command to a JSON debugger request.
Handle<Value> request = Shell::DebugCommandToJSONRequest(
isolate, String::NewFromUtf8(isolate, command));
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
continue;
}
// If undefined is returned the command was handled internally and there is
// no JSON to send.
if (request->IsUndefined()) {
continue;
}
Handle<String> fun_name;
Handle<Function> fun;
// All the functions used below take one argument.
static const int kArgc = 1;
Handle<Value> args[kArgc];
// Invoke the JavaScript to convert the debug command line to a JSON
// request, invoke the JSON request and convert the JSON respose to a text
// representation.
fun_name = String::NewFromUtf8(isolate, "processDebugRequest");
fun = Handle<Function>::Cast(cmd_processor->Get(fun_name));
args[0] = request;
Handle<Value> response_val = fun->Call(cmd_processor, kArgc, args);
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
continue;
}
Handle<String> response = Handle<String>::Cast(response_val);
// Convert the debugger response into text details and the running state.
Handle<Object> response_details =
Shell::DebugMessageDetails(isolate, response);
if (try_catch.HasCaught()) {
Shell::ReportException(isolate, &try_catch);
continue;
}
String::Utf8Value text_str(
response_details->Get(String::NewFromUtf8(isolate, "text")));
if (text_str.length() > 0) {
printf("%s\n", *text_str);
}
running = response_details->Get(String::NewFromUtf8(isolate, "running"))
->ToBoolean()
->Value();
}
}
} // namespace v8