39e68c5e40
When InferReceiverMaps doesn't provide us with reliable maps for the resolution, we can still utilize the information if all the maps that are found are stable - aka leaf - maps. But in that case we need to make sure that we add proper dependencies on the stability of these maps. Bug: v8:7253 Change-Id: I6f5825583acc3f2575e83a244d55609ac64d04d3 Reviewed-on: https://chromium-review.googlesource.com/c/1288633 Reviewed-by: Georg Neis <neis@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#56789}
62 lines
1.6 KiB
JavaScript
62 lines
1.6 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --opt --noalways-opt
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// Test that JSResolvePromise takes a proper stability dependency
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// on the resolutions map if the infer receiver maps are unreliable
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// (as is the case for HeapConstants).
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(function() {
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// We need an object literal which gets a stable map initially.
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function makeObjectWithStableMap() {
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return {a:1, b:1, c:1};
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}
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const a = makeObjectWithStableMap();
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function foo() {
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return Promise.resolve(a);
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}
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assertInstanceof(foo(), Promise);
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assertInstanceof(foo(), Promise);
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%OptimizeFunctionOnNextCall(foo);
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assertInstanceof(foo(), Promise);
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assertOptimized(foo);
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// Now invalidate the stability of a's map.
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const b = makeObjectWithStableMap();
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b.d = 1;
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// This should deoptimize foo.
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assertUnoptimized(foo);
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})();
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// Same test with async functions.
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(function() {
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// We need an object literal which gets a stable map initially,
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// it needs to be different from the above, otherwise the map
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// is already not stable when we get here.
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function makeObjectWithStableMap() {
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return {x:1, y:1};
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}
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const a = makeObjectWithStableMap();
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async function foo() {
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return a;
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}
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assertInstanceof(foo(), Promise);
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assertInstanceof(foo(), Promise);
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%OptimizeFunctionOnNextCall(foo);
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assertInstanceof(foo(), Promise);
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assertOptimized(foo);
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// Now invalidate the stability of a's map.
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const b = makeObjectWithStableMap();
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b.z = 1;
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// This should deoptimize foo.
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assertUnoptimized(foo);
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})();
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