mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016-2018 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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#pragma once
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#if ENABLE(JIT)
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#include "CodeLocation.h"
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#include "PropertyOffset.h"
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namespace JSC {
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class JSArray;
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class Structure;
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class StructureStubInfo;
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class VM;
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class InlineAccess {
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public:
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// This is the maximum between inline and out of line self access cases.
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static constexpr size_t sizeForPropertyAccess()
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{
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#if CPU(X86_64)
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return 26;
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#elif CPU(X86)
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return 27;
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#elif CPU(ARM64)
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return 40;
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#elif CPU(ARM_THUMB2)
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return 48;
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#elif CPU(MIPS)
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return 72;
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#else
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#error "unsupported platform"
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#endif
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}
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// This is the maximum between inline and out of line property replace cases.
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static constexpr size_t sizeForPropertyReplace()
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{
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#if CPU(X86_64)
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return 26;
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#elif CPU(X86)
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return 27;
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#elif CPU(ARM64)
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return 40;
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#elif CPU(ARM_THUMB2)
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return 48;
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#elif CPU(MIPS)
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return 72;
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#else
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#error "unsupported platform"
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#endif
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}
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// FIXME: Make this constexpr when GCC is able to compile std::max() inside a constexpr function.
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// https://bugs.webkit.org/show_bug.cgi?id=159436
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//
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// This is the maximum between array length, string length, and regular self access sizes.
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ALWAYS_INLINE static size_t sizeForLengthAccess()
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{
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#if CPU(X86_64)
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size_t size = 43;
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#elif CPU(X86)
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size_t size = 27;
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#elif CPU(ARM64)
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size_t size = 44;
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#elif CPU(ARM_THUMB2)
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size_t size = 30;
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#elif CPU(MIPS)
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size_t size = 56;
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#else
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#error "unsupported platform"
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#endif
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return std::max(size, sizeForPropertyAccess());
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}
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static bool generateSelfPropertyAccess(StructureStubInfo&, Structure*, PropertyOffset);
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static bool canGenerateSelfPropertyReplace(StructureStubInfo&, PropertyOffset);
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static bool generateSelfPropertyReplace(StructureStubInfo&, Structure*, PropertyOffset);
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static bool isCacheableArrayLength(StructureStubInfo&, JSArray*);
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static bool isCacheableStringLength(StructureStubInfo&);
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static bool generateArrayLength(StructureStubInfo&, JSArray*);
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static void rewireStubAsJump(StructureStubInfo&, CodeLocationLabel<JITStubRoutinePtrTag>);
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static bool generateSelfInAccess(StructureStubInfo&, Structure*);
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static bool generateStringLength(StructureStubInfo&);
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// This is helpful when determining the size of an IC on
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// various platforms. When adding a new type of IC, implement
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// its placeholder code here, and log the size. That way we
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// can intelligently choose sizes on various platforms.
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JS_EXPORT_PRIVATE NO_RETURN_DUE_TO_CRASH static void dumpCacheSizesAndCrash();
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};
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} // namespace JSC
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#endif // ENABLE(JIT)
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