onEnterFrame-async-resumption-05.js

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// A Debugger can't force-return from the first onEnterFrame for an async generator.

ignoreUnhandledRejections();

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

g.eval(`async function* f(x) { await x; return "ponies"; }`);

let dbg = new Debugger;

let gw = dbg.addDebuggee(g);

let log = "";

let completion = undefined;

let resumption = undefined;

dbg.uncaughtExceptionHook = exc => {

    log += "2";

    assertEq(exc.message, "can't force return from a generator before the initial yield");

    assertEq(exc.constructor, TypeError);

    return undefined;  // Squelch the error and let the debuggee continue.

};

dbg.onEnterFrame = frame => {

    if (frame.type == "call" && frame.callee.name === "f") {

        frame.onPop = c => {

            // We get here after the uncaughtExcpetionHook fires

            // and the debuggee frame has run to the first await.

            completion = c;

            assertEq(completion.return.class, "AsyncGenerator");

            assertEq(completion.return !== resumption.return, true);

            log += "3";

};

        // Try force-returning an actual object of the expected type.

        dbg.onEnterFrame = undefined;  // don't recurse

        resumption = frame.eval('f(0)');

        assertEq(resumption.return.class, "AsyncGenerator");

        log += "1";

        return resumption;

};

let it = g.f(0);

assertEq(log, "123");

assertEq(gw.makeDebuggeeValue(it), completion.return);