Frame-onStep-generator-resumption-01.js

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// The debugger can't force return from a generator before the initial yield.

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

g.eval(`

  function* f() {

    yield 1;

`);

let dbg = new Debugger(g);

let steps = 0;

let uncaughtErrorsReported = 0;

dbg.onEnterFrame = frame => {

  assertEq(frame.callee.name, "f");

  dbg.onEnterFrame = undefined;

  frame.onStep = () => {

    steps++;

    // This test case never resumes the generator after the initial

    // yield. Therefore the initial yield has not happened yet. So this

    // force-return will be an error.

    return {return: "ponies"};

};

  // Having an onPop hook exercises some assertions that don't happen

  // otherwise.

  frame.onPop = completion => {};

};

dbg.uncaughtExceptionHook = (reason) => {

  // When onEnterFrame returns an invalid resumption value,

  // the error is reported here.

  assertEq(reason instanceof TypeError, true);

  uncaughtErrorsReported++;

  return undefined;  // Cancel the force-return. Let the debuggee continue.

};

let result = g.f();

assertEq(result instanceof g.f, true);

assertEq(steps > 0, true);

assertEq(uncaughtErrorsReported, steps);