1fa4285e1c
This involves: - Enabling the tail call optimization reducer in all cases. - Adding an addition flag to CallFunctionParameters to mark call sites that can be tail-called enabled. - Only set the tail-call flag for %_CallFunction. R=bmeurer@chromium.org Review URL: https://codereview.chromium.org/1216933011 Cr-Commit-Position: refs/heads/master@{#29436}
82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
// Copyright 2015 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 --nostress-opt --turbo
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var p0 = new Object();
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var p1 = new Object();
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var p2 = new Object();
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// Ensure 1 parameter passed straight-through is handled correctly
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var count1 = 100000;
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tailee1 = function() {
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"use strict";
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if (count1-- == 0) {
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return this;
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}
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return %_CallFunction(this, tailee1);
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};
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%OptimizeFunctionOnNextCall(tailee1);
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assertEquals(p0, tailee1.call(p0));
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// Ensure 2 parameters passed straight-through trigger a tail call are handled
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// correctly and don't cause a stack overflow.
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var count2 = 100000;
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tailee2 = function(px) {
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"use strict";
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assertEquals(p2, px);
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assertEquals(p1, this);
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count2 = ((count2 | 0) - 1) | 0;
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if ((count2 | 0) === 0) {
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return this;
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}
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return %_CallFunction(this, px, tailee2);
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};
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%OptimizeFunctionOnNextCall(tailee2);
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assertEquals(p1, tailee2.call(p1, p2));
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// Ensure swapped 2 parameters don't trigger a tail call (parameter swizzling
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// for the tail call isn't supported yet).
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var count3 = 100000;
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tailee3 = function(px) {
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"use strict";
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if (count3-- == 0) {
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return this;
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}
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return %_CallFunction(px, this, tailee3);
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};
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%OptimizeFunctionOnNextCall(tailee3);
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assertThrows(function() { tailee3.call(p1, p2); });
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// Ensure too many parameters defeats the tail call optimization (currently
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// unsupported).
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var count4 = 1000000;
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tailee4 = function(px) {
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"use strict";
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if (count4-- == 0) {
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return this;
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}
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return %_CallFunction(this, px, undefined, tailee4);
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};
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%OptimizeFunctionOnNextCall(tailee4);
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assertThrows(function() { tailee4.call(p1, p2); });
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// Ensure too few parameters defeats the tail call optimization (currently
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// unsupported).
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var count5 = 1000000;
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tailee5 = function(px) {
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"use strict";
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if (count5-- == 0) {
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return this;
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}
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return %_CallFunction(this, tailee5);
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};
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%OptimizeFunctionOnNextCall(tailee5);
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assertThrows(function() { tailee5.call(p1, p2); });
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