mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
/*
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* Copyright (C) 2016 Apple Inc. All rights reserved.
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*
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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
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* are met:
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* 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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*/
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#include "config.h"
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#include "ArrayConventions.h"
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#include "GCMemoryOperations.h"
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namespace JSC {
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#if USE(JSVALUE64)
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void clearArrayMemset(WriteBarrier<Unknown>* base, unsigned count)
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{
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gcSafeZeroMemory(base, count * sizeof(WriteBarrier<Unknown>));
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}
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void clearArrayMemset(double* base, unsigned count)
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{
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#if CPU(X86_64) && COMPILER(GCC_COMPATIBLE)
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uint64_t pnan = bitwise_cast<uint64_t>(PNaN);
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asm volatile (
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"rep stosq\n\t"
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: "+D"(base), "+c"(count)
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: "a"(pnan)
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: "memory"
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);
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#else // not CPU(X86_64)
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// Oh no, we can't actually do any better than this!
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for (unsigned i = count; i--;)
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base[i] = PNaN;
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#endif // generic CPU
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}
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#endif // USE(JSVALUE64)
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} // namespace JSC
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