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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 JSInterfaceJIT_h
#define JSInterfaceJIT_h
#include "BytecodeConventions.h"
#include "CCallHelpers.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "JITCode.h"
#include "JITOperations.h"
#include "JITStubs.h"
#include "JSCJSValue.h"
#include "JSStack.h"
#include "JSString.h"
#include "MacroAssembler.h"
#include <wtf/Vector.h>
#if ENABLE(JIT)
namespace JSC {
class JSInterfaceJIT : public CCallHelpers, public GPRInfo, public FPRInfo {
public:
JSInterfaceJIT(VM* vm, CodeBlock* codeBlock = 0)
: CCallHelpers(vm, codeBlock)
{
}
#if USE(JSVALUE32_64)
// Can't just propogate JSValue::Int32Tag as visual studio doesn't like it
static const unsigned Int32Tag = 0xffffffff;
COMPILE_ASSERT(Int32Tag == JSValue::Int32Tag, Int32Tag_out_of_sync);
#else
static const unsigned Int32Tag = static_cast<unsigned>(TagTypeNumber >> 32);
#endif
inline Jump emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload);
inline Jump emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst);
inline Jump emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch);
#if USE(JSVALUE32_64)
inline Jump emitJumpIfNotJSCell(unsigned virtualRegisterIndex);
inline Address tagFor(int index, RegisterID base = callFrameRegister);
#endif
#if USE(JSVALUE64)
Jump emitJumpIfNotJSCell(RegisterID);
Jump emitJumpIfImmediateNumber(RegisterID reg);
Jump emitJumpIfNotImmediateNumber(RegisterID reg);
void emitFastArithImmToInt(RegisterID reg);
void emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest);
#endif
Jump emitJumpIfNotType(RegisterID baseReg, JSType);
void emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry, RegisterID to, RegisterID from = callFrameRegister);
void emitPutToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
void emitPutImmediateToCallFrameHeader(void* value, JSStack::CallFrameHeaderEntry);
void emitPutCellToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry);
inline Address payloadFor(int index, RegisterID base = callFrameRegister);
inline Address intPayloadFor(int index, RegisterID base = callFrameRegister);
inline Address intTagFor(int index, RegisterID base = callFrameRegister);
inline Address addressFor(int index, RegisterID base = callFrameRegister);
};
struct ThunkHelpers {
static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); }
static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); }
};
#if USE(JSVALUE32_64)
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload)
{
loadPtr(payloadFor(virtualRegisterIndex), payload);
return emitJumpIfNotJSCell(virtualRegisterIndex);
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(unsigned virtualRegisterIndex)
{
ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
return branch32(NotEqual, tagFor(virtualRegisterIndex), TrustedImm32(JSValue::CellTag));
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
{
ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
loadPtr(payloadFor(virtualRegisterIndex), dst);
return branch32(NotEqual, tagFor(static_cast<int>(virtualRegisterIndex)), TrustedImm32(JSValue::Int32Tag));
}
inline JSInterfaceJIT::Address JSInterfaceJIT::tagFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.tag));
}
inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.payload));
}
inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
{
return payloadFor(virtualRegisterIndex, base);
}
inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
{
return tagFor(virtualRegisterIndex, base);
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
{
ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
loadPtr(tagFor(virtualRegisterIndex), scratch);
Jump isDouble = branch32(Below, scratch, TrustedImm32(JSValue::LowestTag));
Jump notInt = branch32(NotEqual, scratch, TrustedImm32(JSValue::Int32Tag));
loadPtr(payloadFor(virtualRegisterIndex), scratch);
convertInt32ToDouble(scratch, dst);
Jump done = jump();
isDouble.link(this);
loadDouble(addressFor(virtualRegisterIndex), dst);
done.link(this);
return notInt;
}
#endif
#if USE(JSVALUE64)
ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(RegisterID reg)
{
return branchTest64(NonZero, reg, tagMaskRegister);
}
ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfImmediateNumber(RegisterID reg)
{
return branchTest64(NonZero, reg, tagTypeNumberRegister);
}
ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotImmediateNumber(RegisterID reg)
{
return branchTest64(Zero, reg, tagTypeNumberRegister);
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst)
{
load64(addressFor(virtualRegisterIndex), dst);
return branchTest64(NonZero, dst, tagMaskRegister);
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
{
load64(addressFor(virtualRegisterIndex), dst);
Jump result = branch64(Below, dst, tagTypeNumberRegister);
zeroExtend32ToPtr(dst, dst);
return result;
}
inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
{
load64(addressFor(virtualRegisterIndex), scratch);
Jump notNumber = emitJumpIfNotImmediateNumber(scratch);
Jump notInt = branch64(Below, scratch, tagTypeNumberRegister);
convertInt32ToDouble(scratch, dst);
Jump done = jump();
notInt.link(this);
add64(tagTypeNumberRegister, scratch);
move64ToDouble(scratch, dst);
done.link(this);
return notNumber;
}
ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID)
{
}
// operand is int32_t, must have been zero-extended if register is 64-bit.
ALWAYS_INLINE void JSInterfaceJIT::emitFastArithIntToImmNoCheck(RegisterID src, RegisterID dest)
{
if (src != dest)
move(src, dest);
or64(tagTypeNumberRegister, dest);
}
#endif
#if USE(JSVALUE64)
inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return addressFor(virtualRegisterIndex, base);
}
inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
}
inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
}
#endif
ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotType(RegisterID baseReg, JSType type)
{
return branch8(NotEqual, Address(baseReg, JSCell::typeInfoTypeOffset()), TrustedImm32(type));
}
ALWAYS_INLINE void JSInterfaceJIT::emitGetFromCallFrameHeaderPtr(JSStack::CallFrameHeaderEntry entry, RegisterID to, RegisterID from)
{
loadPtr(Address(from, entry * sizeof(Register)), to);
}
ALWAYS_INLINE void JSInterfaceJIT::emitPutToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry entry)
{
#if USE(JSVALUE32_64)
storePtr(from, payloadFor(entry, callFrameRegister));
#else
store64(from, addressFor(entry, callFrameRegister));
#endif
}
ALWAYS_INLINE void JSInterfaceJIT::emitPutImmediateToCallFrameHeader(void* value, JSStack::CallFrameHeaderEntry entry)
{
storePtr(TrustedImmPtr(value), Address(callFrameRegister, entry * sizeof(Register)));
}
ALWAYS_INLINE void JSInterfaceJIT::emitPutCellToCallFrameHeader(RegisterID from, JSStack::CallFrameHeaderEntry entry)
{
#if USE(JSVALUE32_64)
store32(TrustedImm32(JSValue::CellTag), tagFor(entry, callFrameRegister));
store32(from, payloadFor(entry, callFrameRegister));
#else
store64(from, addressFor(entry, callFrameRegister));
#endif
}
inline JSInterfaceJIT::Address JSInterfaceJIT::addressFor(int virtualRegisterIndex, RegisterID base)
{
ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)));
}
} // namespace JSC
#endif // ENABLE(JIT)
#endif // JSInterfaceJIT_h