Status: New
Owner: ----
New issue 3510 by [email protected]: Harmony proxies are impossible to
debug in tcp debugger (v8 3.24.35.22)
http://code.google.com/p/v8/issues/detail?id=3510
Hello,
I've already reported this issue for node.js (
https://github.com/joyent/node/issues/8124#event-152101531 ), but it seems
it originated from V8 itself.
The situation is that if I have a breakpoint in a tcp based debugging
session where the scope is behind a proxy call, then debuger hangs up, node
console say "illegal access buff", and if I continue debugging it crashes
with error: "Internal error: illegal access".
It happens in any debugger I tried: node-inspector, WebStorm, Nodeclipse.
I have a repro script:
var proxy = {
create: function (target)
{
return Proxy.create({
has: function(name)
{
return target[name] !== undefined;
},
get: function (proxy, name)
{
return target[name];
},
set: function (proxy, name, value)
{
target[name] = value;
},
iterate: function* ()
{
for (var p in target) yield p;
},
enumerate: function ()
{
return Object.keys(target);
}
});
}
}
function Foo()
{
this.bar = "Bimbi";
}
Foo.prototype.boo = function()
{
return this.bar; // Put a breakpoint here!
}
var fp = proxy.create(new Foo());
console.log(fp.boo());
Repro steps by using node-inspector:
launch node-inspector
mocha --debug-brk --harmony repro.js
switch to node-inspector, refresh page, put a breakpoint to repro.js line 40
launch debugging
nothing happens, debugging hangs up (except there should be an error
message in the node.js console that says: illegal access buff)
pause debugging
red Internal error: Illegal access will appear in the node-inspector console
There is an other version of this problem. It seems when the breakpoint is
after a certain point in the scope far behind a proxy call, the debugging
session won't hang up but the call stack will be broken, it will contains
many "Internal error: Illegal access" entries instead of valid ones.
node 0.11.13 w/ v8 3.24.35.22
The above issue is not present in Chrome 36.0.1985.143 m with harmony
flags, I can debug my proxies by using the bundled debugger.
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