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// Throwing error after resolving async function's promise should not
// overwrite the promise's state or value/reason.
// This situation can happen either with debugger interaction or OOM.
// This testcase relies on the fact that there's a breakpoint after resolving
// the async function's promise, before leaving the async function's frame.
// This function searches for the last breakpoint before leaving the frame.
//
// - `declCode` should declare an async function `f`, and the function should
// set global variable `returning` to `true` just before return
// - `callCode` should call the function `f` and make sure the function's
// execution reaches the last breakpoint
function searchLastBreakpointBeforeReturn(declCode, callCode) {
const g = newGlobal({ newCompartment: true });
const dbg = new Debugger(g);
g.eval(declCode);
let hit = false;
let offset = 0;
dbg.onEnterFrame = function(frame) {
if (frame.callee && frame.callee.name == "f") {
frame.onStep = () => {
if (!g.returning) {
return undefined;
}
offset = frame.offset;
return undefined;
};
}
};
g.eval(callCode);
drainJobQueue();
assertEq(offset != 0, true);
return offset;
}
function testWithoutAwait() {
const declCode = `
var returning = false;
async function f() {
return (returning = true, "expected");
};
`;
const callCode = `
var p = f();
`;
const offset = searchLastBreakpointBeforeReturn(declCode, callCode);
const g = newGlobal({ newCompartment: true });
const dbg = new Debugger(g);
g.eval(declCode);
let onPromiseSettledCount = 0;
dbg.onPromiseSettled = function(promise) {
onPromiseSettledCount++;
// No promise should be rejected.
assertEq(promise.promiseState, "fulfilled");
// Async function's promise should have expected value.
if (onPromiseSettledCount == 1) {
assertEq(promise.promiseValue, "expected");
}
};
let hitBreakpoint = false;
dbg.onEnterFrame = function(frame) {
if (frame.callee && frame.callee.name == "f") {
dbg.onEnterFrame = undefined;
frame.script.setBreakpoint(offset, {
hit() {
hitBreakpoint = true;
return { throw: "unexpected" };
}
});
}
};
enableLastWarning();
g.eval(`
var fulfilledValue;
var rejected = false;
`);
g.eval(callCode);
// The execution reaches to the last breakpoint without running job queue.
assertEq(hitBreakpoint, true);
const warn = getLastWarning();
assertEq(warn.message,
"unhandlable error after resolving async function's promise");
clearLastWarning();
// Add reaction handler after resolution.
// This handler's job will be enqueued immediately.
g.eval(`
p.then(x => {
fulfilledValue = x;
}, e => {
rejected = true;
});
`);
// Run the above handler.
drainJobQueue();
assertEq(g.fulfilledValue, "expected");
assertEq(onPromiseSettledCount >= 1, true);
}
function testWithAwait() {
const declCode = `
var resolve;
var p = new Promise(r => { resolve = r });
var returning = false;
async function f() {
await p;
return (returning = true, "expected");
};
`;
const callCode = `
var p = f();
`;
const resolveCode = `
resolve("resolve");
`;
const offset = searchLastBreakpointBeforeReturn(declCode,
callCode + resolveCode);
const g = newGlobal({newCompartment: true});
const dbg = new Debugger(g);
g.eval(declCode);
let onPromiseSettledCount = 0;
dbg.onPromiseSettled = function(promise) {
onPromiseSettledCount++;
// No promise should be rejected.
assertEq(promise.promiseState, "fulfilled");
// Async function's promise should have expected value.
if (onPromiseSettledCount == 2) {
assertEq(promise.promiseValue, "expected");
}
};
let hitBreakpoint = false;
dbg.onEnterFrame = function(frame) {
if (frame.callee && frame.callee.name == "f") {
dbg.onEnterFrame = undefined;
frame.script.setBreakpoint(offset, {
hit() {
hitBreakpoint = true;
return { throw: "unexpected" };
}
});
}
};
enableLastWarning();
g.eval(`
var fulfilledValue1;
var fulfilledValue2;
var rejected = false;
`);
g.eval(callCode);
assertEq(getLastWarning(), null);
// Add reaction handler before resolution.
// This handler's job will be enqueued when `p` is resolved.
g.eval(`
p.then(x => {
fulfilledValue1 = x;
}, e => {
rejected = true;
});
`);
g.eval(resolveCode);
// Run the remaining part of async function, and the above handler.
drainJobQueue();
// The execution reaches to the last breakpoint after running job queue for
// resolving `p`.
assertEq(hitBreakpoint, true);
const warn = getLastWarning();
assertEq(warn.message,
"unhandlable error after resolving async function's promise");
clearLastWarning();
assertEq(g.fulfilledValue1, "expected");
assertEq(g.rejected, false);
// Add reaction handler after resolution.
// This handler's job will be enqueued immediately.
g.eval(`
p.then(x => {
fulfilledValue2 = x;
}, e => {
rejected = true;
});
`);
// Run the above handler.
drainJobQueue();
assertEq(g.fulfilledValue2, "expected");
assertEq(g.rejected, false);
assertEq(onPromiseSettledCount >= 3, true);
}
testWithoutAwait();
testWithAwait();
|
