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/*
* Copyright (C) 2011 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.
*/
#include "config.h"
#include "DFGRepatch.h"
#if ENABLE(DFG_JIT)
#include "DFGOperations.h"
#include "RepatchBuffer.h"
namespace JSC { namespace DFG {
static void dfgRepatchCall(CodeBlock* codeblock, CodeLocationCall call, FunctionPtr newCalleeFunction)
{
RepatchBuffer repatchBuffer(codeblock);
repatchBuffer.relink(call, newCalleeFunction);
}
static void dfgRepatchGetByIdSelf(CodeBlock* codeBlock, StructureStubInfo& stubInfo, Structure* structure, size_t offset)
{
RepatchBuffer repatchBuffer(codeBlock);
// Only optimize once!
repatchBuffer.relink(stubInfo.callReturnLocation, operationGetById);
// Patch the structure check & the offset of the load.
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelPtrAtOffset(-(intptr_t)stubInfo.u.unset.deltaCheckToCall), structure);
repatchBuffer.repatch(stubInfo.callReturnLocation.dataLabelCompactAtOffset(stubInfo.u.unset.deltaCallToLoad), sizeof(JSValue) * offset);
}
static bool tryCacheGetByID(ExecState* exec, JSValue baseValue, const Identifier&, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
// FIXME: Write a test that proves we need to check for recursion here just
// like the interpreter does, then add a check for recursion.
CodeBlock* codeBlock = exec->codeBlock();
JSGlobalData* globalData = &exec->globalData();
// FIXME: should support length access for Array & String.
// FIXME: Cache property access for immediates.
if (!baseValue.isCell())
return false;
JSCell* baseCell = baseValue.asCell();
Structure* structure = baseCell->structure();
if (!slot.isCacheable())
return false;
if (structure->isUncacheableDictionary())
return false;
// Optimize self access.
if (slot.slotBase() == baseValue) {
if ((slot.cachedPropertyType() != PropertySlot::Value) || ((slot.cachedOffset() * sizeof(JSValue)) > (unsigned)MacroAssembler::MaximumCompactPtrAlignedAddressOffset))
return false;
dfgRepatchGetByIdSelf(codeBlock, stubInfo, structure, slot.cachedOffset());
stubInfo.initGetByIdSelf(*globalData, codeBlock->ownerExecutable(), structure);
return true;
}
// FIXME: should support prototype & chain accesses!
return false;
}
void dfgRepatchGetByID(ExecState* exec, JSValue baseValue, const Identifier& propertyName, const PropertySlot& slot, StructureStubInfo& stubInfo)
{
bool cached = tryCacheGetByID(exec, baseValue, propertyName, slot, stubInfo);
if (!cached)
dfgRepatchCall(exec->codeBlock(), stubInfo.callReturnLocation, operationGetById);
}
} } // namespace JSC::DFG
#endif