abc35080b3
This stub will be used as the basis of a Math.floor-specific CallIC to detect and track calls to floor that return -0. Along the way: - Create a TurboFanCodeStub super class from which the StringLength and MathRound TF stubs derive. - Fix the ugly hack that passes the first stub parameter as the "this" pointer in the the TF-compiled JS function. - Fix bugs in the ia32/x64 disassembler. Review URL: https://codereview.chromium.org/1137703002 Cr-Commit-Position: refs/heads/master@{#28339}
54 lines
2.7 KiB
JavaScript
54 lines
2.7 KiB
JavaScript
// Copyright 2015 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --allow-natives-syntax --expose-natives-as=builtins --noalways-opt
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const kExtraTypeFeedbackMinusZeroSentinel = 1;
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const kFirstSlotExtraTypeFeedbackIndex = 5;
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(function(){
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var floorFunc = function() {
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Math.floor(NaN);
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}
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// Execute the function once to make sure it has a type feedback vector.
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floorFunc(5);
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assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
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%FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
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kFirstSlotExtraTypeFeedbackIndex));
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assertEquals(5.0, builtins.MathFloor_STUB(floorFunc, 4, 5.5));
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assertTrue(kExtraTypeFeedbackMinusZeroSentinel !==
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%FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
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kFirstSlotExtraTypeFeedbackIndex));
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// Executing floor such that it returns -0 should set the proper sentinel in
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// the feedback vector.
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assertEquals(-Infinity, 1/builtins.MathFloor_STUB(floorFunc, 4, -0));
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assertEquals(kExtraTypeFeedbackMinusZeroSentinel,
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%FixedArrayGet(%GetTypeFeedbackVector(floorFunc),
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kFirstSlotExtraTypeFeedbackIndex));
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%ClearFunctionTypeFeedback(floorFunc);
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})();
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