Optical

Assert the optimisation status of a function in v8 given some arguments.

Note: for this to work node must be run with the --allow_natives_syntax flag. See caveats.

API

optical(func, args, thisArg)

Prints the optimisation status of a function applied to the given arguments.

assertOptimized(func, args, thisArg)

Assert the optimisation status of a function applied to some arguments. Will throw an assertion error if the function is not optimised or will lkely be deoptimised.

Example

var optical = require('optical');
 
function myFunction(x, y) {
    return x + y;
}
 
optical.assertOptimized(myFunction, [10, 20]);
 
function notOptimized(x, y) {
    try {
       myFunction(x, y);
    } catch(e) {
    	console.log(e);
        throw e;
    }
}
// Throws assertion error, can't optimise method
// containing try/catch.
optical.assertOptimized(notOptimized, [10, 20]);

Caveats

1. Node must be run with the --allow_natives_syntax flag.
2. This only tests optimisation for given arguments, if your function is polymorphic you won't get a true representation of optimisation status here.

License

MIT