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/*
* Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``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 ITS 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.
*/
#ifndef SpecializedThunkJIT_h
#define SpecializedThunkJIT_h
#if ENABLE(JIT)
#include "Executable.h"
#include "JSInterfaceJIT.h"
#include "LinkBuffer.h"
namespace JSC {
class SpecializedThunkJIT : public JSInterfaceJIT {
public:
static const int ThisArgument = -1;
SpecializedThunkJIT(int expectedArgCount, JSGlobalData* globalData, ExecutablePool* pool)
: m_expectedArgCount(expectedArgCount)
, m_globalData(globalData)
, m_pool(pool)
{
// Check that we have the expected number of arguments
m_failures.append(branch32(NotEqual, Address(callFrameRegister, RegisterFile::ArgumentCount * (int)sizeof(Register)), Imm32(expectedArgCount + 1)));
}
void loadDoubleArgument(int argument, FPRegisterID dst, RegisterID scratch)
{
unsigned src = argumentToVirtualRegister(argument);
m_failures.append(emitLoadDouble(src, dst, scratch));
}
void loadCellArgument(int argument, RegisterID dst)
{
unsigned src = argumentToVirtualRegister(argument);
m_failures.append(emitLoadJSCell(src, dst));
}
void loadJSStringArgument(int argument, RegisterID dst)
{
loadCellArgument(argument, dst);
m_failures.append(branchPtr(NotEqual, Address(dst, 0), ImmPtr(m_globalData->jsStringVPtr)));
m_failures.append(branchTest32(NonZero, Address(dst, OBJECT_OFFSETOF(JSString, m_fiberCount))));
}
void loadInt32Argument(int argument, RegisterID dst, Jump& failTarget)
{
unsigned src = argumentToVirtualRegister(argument);
failTarget = emitLoadInt32(src, dst);
}
void loadInt32Argument(int argument, RegisterID dst)
{
Jump conversionFailed;
loadInt32Argument(argument, dst, conversionFailed);
m_failures.append(conversionFailed);
}
void appendFailure(const Jump& failure)
{
m_failures.append(failure);
}
void returnJSValue(RegisterID src)
{
if (src != regT0)
move(src, regT0);
loadPtr(Address(callFrameRegister, RegisterFile::CallerFrame * (int)sizeof(Register)), callFrameRegister);
ret();
}
void returnDouble(FPRegisterID src)
{
#if USE(JSVALUE64)
moveDoubleToPtr(src, regT0);
subPtr(tagTypeNumberRegister, regT0);
#else
storeDouble(src, Address(stackPointerRegister, -(int)sizeof(double)));
loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.tag) - sizeof(double)), regT1);
loadPtr(Address(stackPointerRegister, OBJECT_OFFSETOF(JSValue, u.asBits.payload) - sizeof(double)), regT0);
#endif
loadPtr(Address(callFrameRegister, RegisterFile::CallerFrame * (int)sizeof(Register)), callFrameRegister);
ret();
}
void returnInt32(RegisterID src)
{
if (src != regT0)
move(src, regT0);
tagReturnAsInt32();
loadPtr(Address(callFrameRegister, RegisterFile::CallerFrame * (int)sizeof(Register)), callFrameRegister);
ret();
}
void returnJSCell(RegisterID src)
{
if (src != regT0)
move(src, regT0);
tagReturnAsJSCell();
loadPtr(Address(callFrameRegister, RegisterFile::CallerFrame * (int)sizeof(Register)), callFrameRegister);
ret();
}
MacroAssemblerCodePtr finalize(MacroAssemblerCodePtr fallback)
{
LinkBuffer patchBuffer(this, m_pool.get(), 0);
patchBuffer.link(m_failures, CodeLocationLabel(fallback));
return patchBuffer.finalizeCode().m_code;
}
private:
int argumentToVirtualRegister(unsigned argument)
{
return -static_cast<int>(RegisterFile::CallFrameHeaderSize + (m_expectedArgCount - argument));
}
void tagReturnAsInt32()
{
#if USE(JSVALUE64)
orPtr(tagTypeNumberRegister, regT0);
#else
move(Imm32(JSValue::Int32Tag), regT1);
#endif
}
void tagReturnAsJSCell()
{
#if USE(JSVALUE32_64)
move(Imm32(JSValue::CellTag), regT1);
#endif
}
int m_expectedArgCount;
JSGlobalData* m_globalData;
RefPtr<ExecutablePool> m_pool;
MacroAssembler::JumpList m_failures;
};
}
#endif // ENABLE(JIT)
#endif // SpecializedThunkJIT_h
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