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/*
* Copyright (C) 2016-2018 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(JIT)
#include "CodeLocation.h"
#include "PropertyOffset.h"
namespace JSC {
class CodeBlock;
class InlineCacheHandler;
class JSArray;
class Structure;
class StructureStubInfo;
class VM;
class InlineAccess {
public:
// This is the maximum between inline and out of line self access cases.
static constexpr size_t sizeForPropertyAccess()
{
#if CPU(X86_64)
return 26;
#elif CPU(X86)
return 27;
#elif CPU(ARM64)
return 40;
#elif CPU(ARM_THUMB2)
return 48;
#elif CPU(RISCV64)
return 44;
#else
#error "unsupported platform"
#endif
}
// This is the maximum between inline and out of line property replace cases.
static constexpr size_t sizeForPropertyReplace()
{
#if CPU(X86_64)
return 26;
#elif CPU(X86)
return 27;
#elif CPU(ARM64)
return 40;
#elif CPU(ARM_THUMB2)
return 48;
#elif CPU(RISCV64)
return 52;
#else
#error "unsupported platform"
#endif
}
// This is the maximum between array length, string length, and regular self access sizes.
ALWAYS_INLINE static constexpr size_t sizeForLengthAccess()
{
#if CPU(X86_64)
size_t size = 43;
#elif CPU(X86)
size_t size = 27;
#elif CPU(ARM64)
size_t size = 44;
#elif CPU(ARM_THUMB2)
size_t size = 30;
#elif CPU(RISCV64)
size_t size = 60;
#else
#error "unsupported platform"
#endif
return std::max(size, sizeForPropertyAccess());
}
static bool generateSelfPropertyAccess(CodeBlock*, StructureStubInfo&, Structure*, PropertyOffset);
static bool canGenerateSelfPropertyReplace(CodeBlock*, StructureStubInfo&, PropertyOffset);
static bool generateSelfPropertyReplace(CodeBlock*, StructureStubInfo&, Structure*, PropertyOffset);
static bool isCacheableArrayLength(CodeBlock*, StructureStubInfo&, JSArray*);
static bool isCacheableStringLength(CodeBlock*, StructureStubInfo&);
static bool generateArrayLength(CodeBlock*, StructureStubInfo&, JSArray*);
static bool generateSelfInAccess(CodeBlock*, StructureStubInfo&, Structure*);
static bool generateStringLength(CodeBlock*, StructureStubInfo&);
static void rewireStubAsJumpInAccess(CodeBlock*, StructureStubInfo&, InlineCacheHandler&);
static void resetStubAsJumpInAccess(CodeBlock*, StructureStubInfo&);
// This is helpful when determining the size of an IC on
// various platforms. When adding a new type of IC, implement
// its placeholder code here, and log the size. That way we
// can intelligently choose sizes on various platforms.
JS_EXPORT_PRIVATE NO_RETURN_DUE_TO_CRASH static void dumpCacheSizesAndCrash();
};
} // namespace JSC
#endif // ENABLE(JIT)
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