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}
91 lines
1.4 KiB
JavaScript
91 lines
1.4 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 --stack-size=100
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//
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// Tail calls work only in strict mode.
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//
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(function() {
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function f(n) {
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if (n <= 0) {
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return "foo";
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}
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return f(n - 1);
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}
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assertThrows(()=>{ f(1e6) });
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})();
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//
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// Tail call normal functions.
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//
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(function() {
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"use strict";
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function f(n) {
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if (n <= 0) {
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return "foo";
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}
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return f(n - 1);
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}
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assertEquals("foo", f(1e6));
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})();
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(function() {
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"use strict";
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function f(n){
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if (n <= 0) {
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return "foo";
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}
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return g(n - 1);
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}
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function g(n){
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if (n <= 0) {
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return "bar";
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}
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return f(n - 1);
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}
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assertEquals("foo", f(1e6));
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assertEquals("bar", f(1e6 + 1));
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})();
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//
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// Tail call bound functions.
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//
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(function() {
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"use strict";
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function f0(n) {
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if (n <= 0) {
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return "foo";
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}
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return f(n - 1);
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}
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var f = f0.bind({});
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assertEquals("foo", f(1e6));
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})();
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(function() {
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"use strict";
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function f0(n){
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if (n <= 0) {
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return "foo";
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}
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return g(n - 1);
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}
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function g0(n){
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if (n <= 0) {
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return "bar";
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}
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return f(n - 1);
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}
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var f = f0.bind({});
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var g = g0.bind({});
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assertEquals("foo", f(1e6));
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assertEquals("bar", f(1e6 + 1));
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})();
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