Frame-onPop-generators-03.js

Enable keyboard shortcuts

// onPop fires while the [[GeneratorState]] is still "executing".

//

// This test checks that Debugger doesn't accidentally make it possible to

// reenter a generator frame that's on the stack.

load(libdir + "asserts.js");

let g = newGlobal({newCompartment: true});

g.eval('function* f() { debugger; yield 1; debugger; yield 2; debugger; }');

let dbg = Debugger(g);

let genObj = g.f();

let hits = 0;

dbg.onDebuggerStatement = frame => {

    frame.onPop = completion => {

        dbg.removeDebuggee(g);  // avoid the DebuggeeWouldRun exception

        hits++;

        if (hits < 3) {

            // We're yielding. Calling .return(), .next(), or .throw() on a

            // generator that's currently on the stack fails with a TypeError.

            assertThrowsInstanceOf(() => genObj.next(), g.TypeError);

            assertThrowsInstanceOf(() => genObj.throw("fit"), g.TypeError);

            assertThrowsInstanceOf(() => genObj.return(), g.TypeError);

        } else {

            // This time we're returning. The generator has already been

            // closed, so its methods work but are basically no-ops.

            let result = genObj.next();

            assertEq(result.done, true);

            assertEq(result.value, undefined);

            assertThrowsValue(() => genObj.throw("fit"), "fit");

            result = genObj.return();

            assertEq(result.done, true);

            assertEq(result.value, undefined);

        dbg.addDebuggee(g);

};

};

for (let x of genObj) {}

assertEq(hits, 3);