6131ab1edd
This CL implements PrepareForTailCall() mentioned in ES6 spec for full codegen, Crankshaft and Turbofan. When debugger is active tail calls are disabled. Tail calling can be enabled by --harmony-tailcalls flag. BUG=v8:4698 LOG=Y TBR=rossberg@chromium.org Review URL: https://codereview.chromium.org/1609893003 Cr-Commit-Position: refs/heads/master@{#33509}
98 lines
2.5 KiB
JavaScript
98 lines
2.5 KiB
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: --allow-natives-syntax --harmony-tailcalls --harmony-proxies
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"use strict";
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Error.prepareStackTrace = (e,s) => s;
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function CheckStackTrace(expected) {
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var stack = (new Error()).stack;
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assertEquals("CheckStackTrace", stack[0].getFunctionName());
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for (var i = 0; i < expected.length; i++) {
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assertEquals(expected[i].name, stack[i + 1].getFunctionName());
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}
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}
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// Tail call proxy function when caller does not have an arguments
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// adaptor frame.
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(function test() {
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// Caller and callee have same number of arguments.
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function f1(a) {
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CheckStackTrace([f1, test]);
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return 10 + a;
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}
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var p1 = new Proxy(f1, {});
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function g1(a) { return p1(2); }
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assertEquals(12, g1(1));
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// Caller has more arguments than callee.
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function f2(a) {
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CheckStackTrace([f2, test]);
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return 10 + a;
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}
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var p2 = new Proxy(f2, {});
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function g2(a, b, c) { return p2(2); }
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assertEquals(12, g2(1, 2, 3));
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// Caller has less arguments than callee.
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function f3(a, b, c) {
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CheckStackTrace([f3, test]);
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return 10 + a + b + c;
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}
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var p3 = new Proxy(f3, {});
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function g3(a) { return p3(2, 3, 4); }
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assertEquals(19, g3(1));
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// Callee has arguments adaptor frame.
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function f4(a, b, c) {
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CheckStackTrace([f4, test]);
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return 10 + a;
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}
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var p4 = new Proxy(f4, {});
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function g4(a) { return p4(2); }
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assertEquals(12, g4(1));
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})();
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// Tail call proxy function when caller has an arguments adaptor frame.
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(function test() {
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// Caller and callee have same number of arguments.
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function f1(a) {
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CheckStackTrace([f1, test]);
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return 10 + a;
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}
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var p1 = new Proxy(f1, {});
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function g1(a) { return p1(2); }
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assertEquals(12, g1());
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// Caller has more arguments than callee.
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function f2(a) {
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CheckStackTrace([f2, test]);
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return 10 + a;
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}
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var p2 = new Proxy(f2, {});
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function g2(a, b, c) { return p2(2); }
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assertEquals(12, g2());
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// Caller has less arguments than callee.
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function f3(a, b, c) {
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CheckStackTrace([f3, test]);
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return 10 + a + b + c;
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}
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var p3 = new Proxy(f3, {});
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function g3(a) { return p3(2, 3, 4); }
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assertEquals(19, g3());
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// Callee has arguments adaptor frame.
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function f4(a, b, c) {
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CheckStackTrace([f4, test]);
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return 10 + a;
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}
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var p4 = new Proxy(f4, {});
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function g4(a) { return p4(2); }
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assertEquals(12, g4());
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})();
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