I have the following overly simplistic code which tries to enable the
"wait for debugger attach" behavior of the V8 debug agent, so that I
can attach a remote debugger to the process (via Eclipse and the
ChromDevTools remote debugger):
#include <iostream>
#include "v8/v8.h"
#include "v8/v8-debug.h"
v8::Persistent<v8::Context> gDebugContext;
const std::string gSampleScript = "'Hello,' + ' World'";
// Never called, unfortunately...
void OnV8DebugMessage(void)
{
std::cout << "OnV8DebugMessage" << std::endl;
v8::Context::Scope contextScope(gDebugContext);
v8::Debug::ProcessDebugMessages();
}
int main(int argc, char* argv[])
{
v8::V8::Initialize();
// V8 should pause on first statement (but doesn't)
v8::Debug::EnableAgent("My Debugee", 9222, true);
v8::Debug::SetDebugMessageDispatchHandler(OnV8DebugMessage, true);
gDebugContext = v8::Context::New();
// Simulate v8 usage elsewhere in the codebase that main() knows
nothing
// about (actual scenario is via a dynamically loaded module/plugin/
class
// in this process space).
{
v8::Locker lock;
v8::HandleScope handleScope;
v8::Persistent<v8::Context> context = v8::Context::New();
v8::Context::Scope contextScope(context);
v8::Handle<v8::String> source =
v8::String::New(gSampleScript.c_str());
v8::Handle<v8::Script> script = v8::Script::Compile(source);
// Here's where I'd expect script execution to pause until a
debugger
// attaches, but that's not the case...
v8::Handle<v8::Value> result = script->Run();
context.Dispose();
v8::String::AsciiValue ascii(result);
std::cout << *ascii << std::endl;
}
gDebugContext.Dispose();
return 0;
}
I get the console output of "Hello, World", but the process never
blocks to allow a debugger to attach. Additionally, the
OnV8DebugMessage() method is never called.
There is bound to be something obvious I'm not understanding. Can
anybody enlighten me?
Cheers,
David
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