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Issue #2089 - Implement the Promise.any combinator
Based-on: m-c 1568903/9,1560300
This commit is contained in:
Martok
roytam1
parent
9fc50a9920
commit
f75e9d9441
9 changed files with 577 additions and 50 deletions
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@ -16,11 +16,14 @@
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#include "gc/Heap.h"
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#include "js/Debug.h"
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#include "vm/ArrayObject.h"
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#include "vm/AsyncFunction.h"
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#include "vm/AsyncIteration.h"
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#include "vm/ErrorObject.h"
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#include "jsobjinlines.h"
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#include "vm/ErrorObject-inl.h"
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#include "vm/NativeObject-inl.h"
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using namespace js;
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@ -2170,28 +2173,33 @@ class MOZ_STACK_CLASS PromiseForOfIterator : public JS::ForOfIterator {
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static MOZ_MUST_USE bool
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PerformPromiseAll(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done);
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done);
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static MOZ_MUST_USE bool
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PerformPromiseAllSettled(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done);
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done);
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static MOZ_MUST_USE bool PerformPromiseRace(
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JSContext* cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done);
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static MOZ_MUST_USE bool
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PerformPromiseAny(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done);
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enum class CombinatorKind { All, AllSettled, Race };
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static MOZ_MUST_USE bool
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PerformPromiseRace(JSContext* cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done);
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// ES2020 draft rev a09fc232c137800dbf51b6204f37fdede4ba1646
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enum class CombinatorKind { All, AllSettled, Any, Race };
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// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
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//
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// Unified implementation of
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// 25.6.4.1 Promise.all ( iterable )
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// 25.6.4.3 Promise.race ( iterable )
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// 25.6.4.2 Promise.allSettled ( iterable )
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// 25.6.4.4 Promise.race ( iterable )
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//
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// Promise.allSettled (Stage 3 proposal)
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// https://tc39.github.io/proposal-promise-allSettled/
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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//
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// Promise.allSettled ( iterable )
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// Promise.any ( iterable )
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static MOZ_MUST_USE bool
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CommonPromiseCombinator(JSContext* cx, CallArgs& args, CombinatorKind mode)
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{
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@ -2208,6 +2216,9 @@ CommonPromiseCombinator(JSContext* cx, CallArgs& args, CombinatorKind mode)
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case CombinatorKind::AllSettled:
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message = "Receiver of Promise.allSettled call";
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break;
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case CombinatorKind::Any:
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message = "Receiver of Promise.any call";
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break;
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case CombinatorKind::Race:
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message = "Receiver of Promise.race call";
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break;
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@ -2225,7 +2236,40 @@ CommonPromiseCombinator(JSContext* cx, CallArgs& args, CombinatorKind mode)
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if (!NewPromiseCapability(cx, C, &promiseCapability, false))
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return false;
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// Steps 4-5.
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// Regardless of whether we got a fast-path promise from NewPromiseCapability,
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// the spec requires us to throw TypeError if |Promise.reject| is not callable,
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// ie. overwritten in this context. Check the prototype here.
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RootedValue promiseResolve(cx, UndefinedValue());
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{
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JSObject* promiseCtor = GlobalObject::getOrCreatePromiseConstructor(cx, cx->global());
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if (!promiseCtor) {
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return false;
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}
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PromiseLookup& promiseLookup = cx->compartment()->promiseLookup;
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if (C != promiseCtor || !promiseLookup.isDefaultPromiseState(cx)) {
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// Step 3. Let promiseResolve be GetPromiseResolve(C).
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// GetPromiseResolve
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// Step 1. Let promiseResolve be ? Get(promiseConstructor, "resolve").
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if (!GetProperty(cx, C, C, cx->names().resolve, &promiseResolve)) {
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// Step 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
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return AbruptRejectPromise(cx, args, promiseCapability);
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}
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// GetPromiseResolve
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// Step 2. If IsCallable(promiseResolve) is false,
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// throw a TypeError exception.
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if (!IsCallable(promiseResolve)) {
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ReportIsNotFunction(cx, promiseResolve);
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// Step 4. IfAbruptRejectPromise(promiseResolve, promiseCapability).
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return AbruptRejectPromise(cx, args, promiseCapability);
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}
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}
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}
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// Steps 5.
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PromiseForOfIterator iter(cx);
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if (!iter.init(iterable, JS::ForOfIterator::AllowNonIterable))
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return AbruptRejectPromise(cx, args, promiseCapability);
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@ -2239,6 +2283,9 @@ CommonPromiseCombinator(JSContext* cx, CallArgs& args, CombinatorKind mode)
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case CombinatorKind::AllSettled:
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message = "Argument of Promise.allSettled";
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break;
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case CombinatorKind::Any:
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message = "Argument of Promise.any";
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break;
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case CombinatorKind::Race:
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message = "Argument of Promise.race";
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break;
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@ -2254,13 +2301,16 @@ CommonPromiseCombinator(JSContext* cx, CallArgs& args, CombinatorKind mode)
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bool done, result;
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switch (mode) {
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case CombinatorKind::All:
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result = PerformPromiseAll(cx, iter, C, promiseCapability, &done);
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result = PerformPromiseAll(cx, iter, C, promiseCapability, promiseResolve, &done);
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break;
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case CombinatorKind::AllSettled:
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result = PerformPromiseAllSettled(cx, iter, C, promiseCapability, &done);
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result = PerformPromiseAllSettled(cx, iter, C, promiseCapability, promiseResolve, &done);
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break;
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case CombinatorKind::Any:
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result = PerformPromiseAny(cx, iter, C, promiseCapability, promiseResolve, &done);
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break;
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case CombinatorKind::Race:
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result = PerformPromiseRace(cx, iter, C, promiseCapability, &done);
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result = PerformPromiseRace(cx, iter, C, promiseCapability, promiseResolve, &done);
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break;
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}
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@ -2478,18 +2528,19 @@ CommonStaticResolveRejectImpl(JSContext* cx, HandleValue thisVal, HandleValue ar
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static bool
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IsPromiseSpecies(JSContext* cx, JSFunction* species);
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// ES2019 draft rev dd269df67d37409a6f2099a842b8f5c75ee6fc24
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// 25.6.4.1.1 Runtime Semantics: PerformPromiseAll, step 6.
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// 25.6.4.3.1 Runtime Semantics: PerformPromiseRace, step 3.
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// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
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// 25.6.4.1.1 Runtime Semantics: PerformPromiseAll, steps 5-6 and step 8.
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// 25.6.4.2.1 Runtime Semantics: PerformPromiseAllSettled, steps 5-6 and step 8.
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// 25.6.4.4.1 Runtime Semantics: PerformPromiseRace, steps 3-5.
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//
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// Promise.allSettled (Stage 3 proposal)
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// https://tc39.github.io/proposal-promise-allSettled/
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// Runtime Semantics: PerformPromiseAllSettled, step 6.
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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// Runtime Semantics: PerformPromiseAny, steps 6-8.
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template <typename T>
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static MOZ_MUST_USE bool
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CommonPerformPromiseCombinator(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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HandleObject resultPromise, bool* done, bool resolveReturnsUndefined,
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T getResolveAndReject)
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HandleObject resultPromise, HandleValue promiseResolve, bool* done,
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bool resolveReturnsUndefined, T getResolveAndReject)
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{
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RootedObject promiseCtor(cx, GlobalObject::getOrCreatePromiseConstructor(cx, cx->global()));
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if (!promiseCtor)
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@ -2499,13 +2550,13 @@ CommonPerformPromiseCombinator(JSContext *cx, PromiseForOfIterator& iterator, Ha
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// during the iteration.
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bool iterationMayHaveSideEffects = !iterator.isOptimizedDenseArrayIteration();
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PromiseLookup& promiseLookup = cx->compartment()->promiseLookup;
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// Try to optimize when the Promise object is in its default state, seeded
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// with |C == promiseCtor| because we can only perform this optimization
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// for the builtin Promise constructor.
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bool isDefaultPromiseState = C == promiseCtor;
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bool validatePromiseState = true;
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PromiseLookup& promiseLookup = cx->compartment()->promiseLookup;
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bool isDefaultPromiseState = C == promiseCtor && promiseLookup.isDefaultPromiseState(cx);
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bool validatePromiseState = iterationMayHaveSideEffects;
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RootedValue CVal(cx, ObjectValue(*C));
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RootedValue resolveFunVal(cx);
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@ -2579,16 +2630,29 @@ CommonPerformPromiseCombinator(JSContext *cx, PromiseForOfIterator& iterator, Ha
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nextPromise.setObject(*res);
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}
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} else {
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// 25.6.4.1.1, step 6.i.
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// 25.6.4.3.1, step 3.h.
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// Sadly, because someone could have overridden
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// "resolve" on the canonical Promise constructor.
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RootedValue& staticResolve = resolveOrThen;
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if (!GetProperty(cx, C, CVal, cx->names().resolve, &staticResolve))
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return false;
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// |promiseResolve| gets passed in from |CommonPromiseCombinator| via |PerformPromise*|.
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// It is undefined when the Promise constructor was initially in its default state.
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// Otherwise it is the value of |Promise.resolve|.
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if (promiseResolve.isUndefined()) {
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// 25.6.4.1.1, step 6.i.
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// 25.6.4.3.1, step 3.h.
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// Inline the call to Promise.resolve.
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JSObject* res = CommonStaticResolveRejectImpl(cx, CVal, nextValue, ResolveMode);
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if (!res)
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return false;
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if (!Call(cx, staticResolve, CVal, nextValue, &nextPromise))
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return false;
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nextPromise.setObject(*res);
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} else {
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// 25.6.4.1.1, step 6.i.
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// 25.6.4.3.1, step 3.h.
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// Sadly, because someone could have overridden
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// "resolve" on the canonical Promise constructor.
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// Step {i, h}. Let nextPromise be
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// ? Call(promiseResolve, constructor, « nextValue »).
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if (!Call(cx, promiseResolve, CVal, nextValue, &nextPromise))
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return false;
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}
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}
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// Get the resolving functions for this iteration.
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@ -2878,7 +2942,7 @@ PromiseCombinatorElementFunctionAlreadyCalled(const CallArgs& args,
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// 25.6.4.1.1 PerformPromiseAll (iteratorRecord, constructor, resultCapability)
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static MOZ_MUST_USE bool
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PerformPromiseAll(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done)
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done)
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{
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*done = false;
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@ -2935,7 +2999,7 @@ PerformPromiseAll(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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// Step 8.
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if (!CommonPerformPromiseCombinator(cx, iterator, C, resultCapability.promise(),
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done, true, getResolveAndReject))
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promiseResolve, done, true, getResolveAndReject))
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return false;
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// Step 8.d.ii.
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@ -3014,7 +3078,7 @@ Promise_static_race(JSContext* cx, unsigned argc, Value* vp)
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// 25.6.4.3.1 PerformPromiseRace (iteratorRecord, constructor, resultCapability)
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static MOZ_MUST_USE bool
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PerformPromiseRace(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done)
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done)
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{
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*done = false;
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@ -3038,15 +3102,15 @@ PerformPromiseRace(JSContext *cx, PromiseForOfIterator& iterator, HandleObject C
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};
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// Step 3-5.
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return CommonPerformPromiseCombinator(cx, iterator, C,
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resultCapability.promise(), done,
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isDefaultResolveFn, getResolveAndReject);
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return CommonPerformPromiseCombinator(cx, iterator, C, resultCapability.promise(),
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promiseResolve, done,
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isDefaultResolveFn, getResolveAndReject);
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}
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enum class PromiseAllSettledElementFunctionKind { Resolve, Reject };
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// Promise.allSettled (Stage 3 proposal)
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// https://tc39.github.io/proposal-promise-allSettled/
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// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
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// 25.6.4.2 Promise.allSettled ( iterable )
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//
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// Promise.allSettled Resolve Element Functions
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// Promise.allSettled Reject Element Functions
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@ -3054,8 +3118,8 @@ template <PromiseAllSettledElementFunctionKind Kind>
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static bool PromiseAllSettledElementFunction(JSContext* cx, unsigned argc,
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Value* vp);
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// Promise.allSettled (Stage 3 proposal)
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// https://tc39.github.io/proposal-promise-allSettled/
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// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
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// 25.6.4.2 Promise.allSettled ( iterable )
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//
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// Promise.allSettled ( iterable )
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static bool Promise_static_allSettled(JSContext* cx, unsigned argc, Value* vp) {
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@ -3063,13 +3127,13 @@ static bool Promise_static_allSettled(JSContext* cx, unsigned argc, Value* vp) {
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return CommonPromiseCombinator(cx, args, CombinatorKind::AllSettled);
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}
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// Promise.allSettled (Stage 3 proposal)
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// https://tc39.github.io/proposal-promise-allSettled/
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// ES2020 draft rev e97c95d064750fb949b6778584702dd658cf5624
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// 25.6.4.2 Promise.allSettled ( iterable )
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//
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// PerformPromiseAllSettled ( iteratorRecord, constructor, resultCapability )
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static MOZ_MUST_USE bool PerformPromiseAllSettled(
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JSContext* cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, bool* done) {
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done) {
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*done = false;
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// Step 1.
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@ -3142,7 +3206,7 @@ static MOZ_MUST_USE bool PerformPromiseAllSettled(
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// Step 5-6 and 8.
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if (!CommonPerformPromiseCombinator(cx, iterator, C, resultCapability.promise(),
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done, true, getResolveAndReject)) {
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promiseResolve, done, true, getResolveAndReject)) {
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return false;
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}
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@ -3250,6 +3314,232 @@ static bool PromiseAllSettledElementFunction(JSContext* cx, unsigned argc,
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return true;
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}
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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//
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// Promise.any ( iterable )
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static bool Promise_static_any(JSContext* cx, unsigned argc, Value* vp) {
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CallArgs args = CallArgsFromVp(argc, vp);
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return CommonPromiseCombinator(cx, args, CombinatorKind::Any);
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}
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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//
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// Promise.any Reject Element Functions
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static bool PromiseAnyRejectElementFunction(JSContext* cx, unsigned argc,
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Value* vp);
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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//
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// ThrowAggregateError ( errors )
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static void ThrowAggregateError(JSContext* cx,
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Handle<PromiseCombinatorElements> errors,
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HandleObject promise);
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// Promise.any (Stage 3 proposal)
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// https://tc39.es/proposal-promise-any/
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//
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// PerformPromiseAny ( iteratorRecord, constructor, resultCapability )
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static MOZ_MUST_USE bool
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PerformPromiseAny(JSContext* cx, PromiseForOfIterator& iterator, HandleObject C,
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Handle<PromiseCapability> resultCapability, HandleValue promiseResolve, bool* done)
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{
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*done = false;
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// Step 1.
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MOZ_ASSERT(C->isConstructor());
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// Step 2 (omitted).
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// Step 3.
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Rooted<PromiseCombinatorElements> errors(cx);
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if (!NewPromiseCombinatorElements(cx, resultCapability, &errors)) {
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return false;
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}
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// Step 4.
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// Create our data holder that holds all the things shared across every step
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// of the iterator. In particular, this holds the remainingElementsCount (as
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// an integer reserved slot), the array of errors, and the reject function
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// from our PromiseCapability.
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Rooted<PromiseCombinatorDataHolder*> dataHolder(cx);
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dataHolder = PromiseCombinatorDataHolder::New(
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cx, resultCapability.promise(), errors, resultCapability.reject());
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if (!dataHolder) {
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return false;
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}
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// Step 5.
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uint32_t index = 0;
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auto getResolveAndReject = [cx, &resultCapability, &errors, &dataHolder,
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&index](MutableHandleValue resolveFunVal,
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MutableHandleValue rejectFunVal) {
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// Step 8.h.
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if (!errors.pushUndefined(cx)) {
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return false;
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}
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// Steps 8.j-p.
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JSFunction* rejectFunc = NewPromiseCombinatorElementFunction(
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cx, PromiseAnyRejectElementFunction, dataHolder, index);
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if (!rejectFunc) {
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return false;
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}
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// Step 8.q.
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dataHolder->increaseRemainingCount();
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// Step 8.s.
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index++;
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MOZ_ASSERT(index > 0);
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resolveFunVal.setObject(*resultCapability.resolve());
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rejectFunVal.setObject(*rejectFunc);
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return true;
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};
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// BlockOnPromise fast path requires the passed onFulfilled function doesn't
|
||||
// return an object value, because otherwise the skipped promise creation is
|
||||
// detectable due to missing property lookups.
|
||||
bool isDefaultResolveFn =
|
||||
IsNativeFunction(resultCapability.resolve(), ResolvePromiseFunction);
|
||||
|
||||
// Steps 6-8.
|
||||
if (!CommonPerformPromiseCombinator(
|
||||
cx, iterator, C, resultCapability.promise(), promiseResolve, done, isDefaultResolveFn,
|
||||
getResolveAndReject)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Step 8.d.ii.
|
||||
int32_t remainingCount = dataHolder->decreaseRemainingCount();
|
||||
|
||||
// Step 8.d.iii.
|
||||
if (remainingCount == 0) {
|
||||
ThrowAggregateError(cx, errors, resultCapability.promise());
|
||||
return false;
|
||||
}
|
||||
|
||||
// Step 8.d.iv.
|
||||
return true;
|
||||
}
|
||||
|
||||
// Promise.any (Stage 3 proposal)
|
||||
// https://tc39.es/proposal-promise-any/
|
||||
//
|
||||
// Promise.any Reject Element Functions
|
||||
static bool
|
||||
PromiseAnyRejectElementFunction(JSContext* cx, unsigned argc, Value* vp)
|
||||
{
|
||||
CallArgs args = CallArgsFromVp(argc, vp);
|
||||
HandleValue xVal = args.get(0);
|
||||
|
||||
// Steps 1-5.
|
||||
Rooted<PromiseCombinatorDataHolder*> data(cx);
|
||||
uint32_t index;
|
||||
if (PromiseCombinatorElementFunctionAlreadyCalled(args, &data, &index)) {
|
||||
args.rval().setUndefined();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Step 6.
|
||||
Rooted<PromiseCombinatorElements> errors(cx);
|
||||
if (!GetPromiseCombinatorElements(cx, data, &errors)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Step 9.
|
||||
if (!errors.setElement(cx, index, xVal)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
// Steps 8, 10.
|
||||
uint32_t remainingCount = data->decreaseRemainingCount();
|
||||
|
||||
// Step 11.
|
||||
if (remainingCount == 0) {
|
||||
// Step 7 (Adapted to work with PromiseCombinatorDataHolder's layout).
|
||||
RootedObject rejectFun(cx, data->resolveOrRejectObj());
|
||||
RootedObject promiseObj(cx, data->promiseObj());
|
||||
|
||||
ThrowAggregateError(cx, errors, promiseObj);
|
||||
|
||||
RootedValue reason(cx);
|
||||
if (!MaybeGetAndClearException(cx, &reason)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
if (!RunResolutionFunction(cx, rejectFun, reason, RejectMode, promiseObj)) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
// Step 12.
|
||||
args.rval().setUndefined();
|
||||
return true;
|
||||
}
|
||||
|
||||
// Promise.any (Stage 3 proposal)
|
||||
// https://tc39.es/proposal-promise-any/
|
||||
//
|
||||
// ThrowAggregateError ( errors )
|
||||
static void
|
||||
ThrowAggregateError(JSContext* cx, Handle<PromiseCombinatorElements> errors, HandleObject promise)
|
||||
{
|
||||
MOZ_ASSERT(!cx->isExceptionPending());
|
||||
|
||||
// Create the AggregateError in the same compartment as the array object.
|
||||
AutoCompartment ac(cx, errors.unwrappedArray());
|
||||
|
||||
RootedObject allocationSite(cx);
|
||||
mozilla::Maybe<JS::AutoSetAsyncStackForNewCalls> asyncStack;
|
||||
|
||||
// Provide a more useful error stack if possible: This function is typically
|
||||
// called from Promise job queue, which doesn't have any JS frames on the
|
||||
// stack. So when we create the AggregateError below, its stack property will
|
||||
// be set to the empty string, which makes it harder to debug the error cause.
|
||||
// To avoid this situation set-up an async stack based on the Promise
|
||||
// allocation site, which should point to calling site of |Promise.any|.
|
||||
if (promise->is<PromiseObject>()) {
|
||||
allocationSite = promise->as<PromiseObject>().allocationSite();
|
||||
if (allocationSite) {
|
||||
asyncStack.emplace(
|
||||
cx, allocationSite, "Promise.any",
|
||||
JS::AutoSetAsyncStackForNewCalls::AsyncCallKind::IMPLICIT);
|
||||
}
|
||||
}
|
||||
|
||||
// AutoSetAsyncStackForNewCalls requires a new activation before it takes
|
||||
// effect, so call into the self-hosting helper to set-up new call frames.
|
||||
RootedValue error(cx);
|
||||
if (!GetAggregateError(cx, JSMSG_PROMISE_ANY_REJECTION, &error)) {
|
||||
return;
|
||||
}
|
||||
|
||||
// |error| isn't guaranteed to be an ErrorObject in case of OOM.
|
||||
RootedSavedFrame stack(cx);
|
||||
if (error.isObject() && error.toObject().is<ErrorObject>()) {
|
||||
Rooted<ErrorObject*> errorObj(cx, &error.toObject().as<ErrorObject>());
|
||||
MOZ_ASSERT(errorObj->type() == JSEXN_AGGREGATEERR);
|
||||
|
||||
RootedValue errorsVal(cx, JS::ObjectValue(*errors.unwrappedArray()));
|
||||
if (!NativeDefineDataProperty(cx, errorObj, cx->names().errors, errorsVal,
|
||||
0)) {
|
||||
return;
|
||||
}
|
||||
|
||||
// Adopt the existing saved frames when present.
|
||||
if (JSObject* errorStack = errorObj->stack()) {
|
||||
stack = &errorStack->as<SavedFrame>();
|
||||
}
|
||||
}
|
||||
|
||||
cx->setPendingException(error, stack);
|
||||
}
|
||||
|
||||
// https://tc39.github.io/ecma262/#sec-promise.reject
|
||||
//
|
||||
// Unified implementation of
|
||||
|
|
@ -4858,6 +5148,7 @@ static const JSPropertySpec promise_properties[] = {
|
|||
static const JSFunctionSpec promise_static_methods[] = {
|
||||
JS_FN("all", Promise_static_all, 1, 0),
|
||||
JS_FN("allSettled", Promise_static_allSettled, 1, 0),
|
||||
JS_FN("any", Promise_static_any, 1, 0),
|
||||
JS_FN("race", Promise_static_race, 1, 0),
|
||||
JS_FN("reject", Promise_reject, 1, 0),
|
||||
JS_FN("resolve", Promise_static_resolve, 1, 0),
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue