On Wed, Aug 3, 2016 at 8:17 AM, Abhishek Singh
<singhabhishek....@gmail.com> wrote:
> Hi,
>
> Sorry to bother again about V8 JSON protocol debugger. I’ve looked through
> debug_agent.cc/.h and _debug_agent.js implementation in node.js in order to
> understand to understand correct way to enable breakpoints(and fire other
> different types of requests). But even after reading though node.js code, to
> be honest it’s difficult to arrive at minimal version of working v8 debugger
> even after reading node src(node.js has some additional Environment, Agent
> and AgentMessage object, I don’t think I need all of them). I guess if I
> spend few more days looking through their src, I could figure something.
>
> At present, my question is if anyone else has some sample code that
> simulates working V8 debugger support? Could you please share code for it?
>
> Currently I’m missing something in my implementation i.e. even when V8
> reports breakpoint is set - code execution doesn’t pause at the bp - more
> details https://groups.google.com/forum/#!topic/v8-users/5ZwslR6XMzk
>
> Thanks
Below is a script that uses the JS API to drive the debugger, maybe it
can help as a starting point? Consult src/debug/debug.js and
src/debug/mirrors.js for more details.
Note that exceptions in the debug listener are silently swallowed by
the runtime. Consider wrapping the body in a big try/catch that
prints the exception.
// Flags: --expose_debug_as=debug
'use strict';
const Debug = debug.Debug;
const DebugEvent = Debug.DebugEvent;
function stringify(o) {
try { return JSON.stringify(o); }
catch (e) { return `<${e.message}>`; }
}
Debug.setListener(function(evt, state, data) {
if (evt !== DebugEvent.Break && evt !== DebugEvent.Exception) return;
print(evt, stringify(state), stringify(data));
});
Debug.setBreakOnException();
Debug.setBreakPoint(f); // Returns the breakpoint number.
print(Debug.showBreakPoints(f));
try { g(); }
catch (e) {}
function f() {
print('breakpoint'); // Triggers event.
throw new Error('boom'); // Triggers event.
}
function g() {
debugger; // Triggers event.
f();
}
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