fd24deb0b2
Similar to JSCall, we can also replace uninitialized JSConstruct nodes with SOFT deopts to ensure that we don't generate unnecessary dead code. This for example shows up in the hot parts of the Node event emitter currently where the generic code for handling events with 4 or more parameters might not have been run, but we still generate most of the code because the new Array call in the beginning is not turned into a SOFT deopt immediately. Drive-by-fix: Also refactor the BytecodeGraphBuilder's handling of Construct bytecodes a bit to reduce the amount of code duplication. BUG=v8:4551, v8:5267 R=jarin@chromium.org Review-Url: https://codereview.chromium.org/2958253002 Cr-Commit-Position: refs/heads/master@{#46339}
29 lines
725 B
JavaScript
29 lines
725 B
JavaScript
// Copyright 2016 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: --opt --allow-natives-syntax --no-always-opt
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class A {
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constructor() { }
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}
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class B extends A {
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constructor(call_super) {
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super();
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if (call_super) {
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super();
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}
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}
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}
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test = new B(0);
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test = new B(0);
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assertThrowsEquals(() => {new B(1)}, ReferenceError());
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assertThrowsEquals(() => {new B(1)}, ReferenceError());
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%OptimizeFunctionOnNextCall(B);
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test = new B(0);
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assertOptimized(B);
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// Check that hole checks are handled correctly in optimized code.
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assertThrowsEquals(() => {new B(1)}, ReferenceError());
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assertOptimized(B);
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