63 lines
2.7 KiB
JavaScript
63 lines
2.7 KiB
JavaScript
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// Copyright 2012 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 --always-opt --expose-gc
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// Test that the elements kind of the boilerplate object is sufficiently
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// checked in LFastLiteral, so that unoptimized code can transition the
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// boilerplate. The --always-opt flag makes sure that optimized code is
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// not thrown away at deoptimization.
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// The switch statement in f() makes sure that f() is not inlined. If we
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// start inlining switch statements, we will still catch the bug on the
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// final --stress-opt run.
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function f(x) {
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switch(x) {
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case 1: return 1.4;
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case 2: return 1.5;
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case 3: return {};
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default: gc();
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}
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}
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function g(x) {
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return [1.1, 1.2, 1.3, f(x)];
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}
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// Step 1: Optimize g() to contain a FAST_DOUBLE_ELEMENTS boilerplate.
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assertEquals([1.1, 1.2, 1.3, 1.4], g(1));
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assertEquals([1.1, 1.2, 1.3, 1.5], g(2));
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%OptimizeFunctionOnNextCall(g);
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// Step 2: Deoptimize g() and transition to FAST_ELEMENTS boilerplate.
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assertEquals([1.1, 1.2, 1.3, {}], g(3));
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// Step 3: Cause a GC while broken clone of boilerplate is on the heap,
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// hence causing heap verification to catch it.
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assertEquals([1.1, 1.2, 1.3, undefined], g(4));
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