cd718536ec
Make JSContextSpecialization constant-fold import.meta loads if the meta object has already been created. Most of this CL was contributed by Gus Caplan. This is a verbatim copy of CL https://chromium-review.googlesource.com/c/v8/v8/+/2170982 which could not be landed due to the wrong email address being used. TBR=verwaest@chromium.org TBR=gsathya@chromium.org Bug: v8:7044 Change-Id: Ief45f3082dc756265904ff500305d32717071e81 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2299375 Reviewed-by: Georg Neis <neis@chromium.org> Commit-Queue: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#68875}
48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
// Copyright 2020 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
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import { getImportMeta } from 'modules-skip-import-meta-export.mjs';
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function foo() {
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return import.meta;
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}
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%PrepareFunctionForOptimization(foo);
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%OptimizeFunctionOnNextCall(foo);
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// Optimize when import.meta hasn't been created yet.
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assertEquals('object', typeof foo());
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assertEquals(import.meta, foo());
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assertOptimized(foo);
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function bar() {
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return import.meta;
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}
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%PrepareFunctionForOptimization(bar);
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// Optimize when import.meta already exists.
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%OptimizeFunctionOnNextCall(bar);
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assertEquals(import.meta, bar());
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assertOptimized(bar);
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%PrepareFunctionForOptimization(getImportMeta);
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%OptimizeFunctionOnNextCall(getImportMeta);
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assertEquals('object', typeof getImportMeta());
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assertOptimized(getImportMeta);
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assertNotEquals(import.meta, getImportMeta());
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assertOptimized(getImportMeta);
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function baz() {
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return getImportMeta();
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}
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// Test inlined (from another module) import.meta accesses.
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%PrepareFunctionForOptimization(baz);
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baz();
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%OptimizeFunctionOnNextCall(baz);
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assertEquals('object', typeof baz());
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assertNotEquals(import.meta, baz());
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assertEquals(baz(), getImportMeta());
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assertOptimized(baz);
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