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J9ByteCodeIterator.hpp
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/*******************************************************************************
* Copyright IBM Corp. and others 2000
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] https://openjdk.org/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#ifndef J9BYTECODEITERATOR_INCL
#define J9BYTECODEITERATOR_INCL
#include "env/jittypes.h"
#include "il/LabelSymbol.hpp"
#include "il/MethodSymbol.hpp"
#include "il/RegisterMappedSymbol.hpp"
#include "il/ResolvedMethodSymbol.hpp"
#include "il/StaticSymbol.hpp"
#include "il/Symbol.hpp"
#include "ilgen/ByteCodeIterator.hpp"
#include "infra/Link.hpp"
#include "env/j9method.h"
#include "env/VMJ9.h"
#include "ilgen/J9ByteCode.hpp"
class TR_J9ByteCodeIterator : public TR_ByteCodeIterator<TR_J9ByteCode, TR_ResolvedJ9Method>
{
typedef TR_ByteCodeIterator<TR_J9ByteCode, TR_ResolvedJ9Method> Base;
public:
TR_ALLOC(TR_Memory::ByteCodeIterator);
enum TR_ByteCodeFlags
{
SizeMask = 0x07,
Branch = 0x08,
ToHandler = 0x10,
Absolute = 0x20,
TwoByteOffset = 0x40,
FourByteOffset = 0x80,
TwoByteRelativeBranch = (Branch | TwoByteOffset),
FourByteRelativeBranch = (Branch | FourByteOffset),
TwoByteAbsoluteBranch = (Branch | Absolute | TwoByteOffset),
FourByteAbsoluteBranch = (Branch | Absolute | FourByteOffset),
TwoByteRelativeToHandler = (ToHandler | TwoByteOffset),
FourByteRelativeToHandler = (ToHandler | FourByteOffset),
TwoByteAbsoluteToHandler = (ToHandler | Absolute | TwoByteOffset),
FourByteAbsoluteToHandler = (ToHandler | Absolute | FourByteOffset),
};
TR_J9ByteCodeIterator(TR::ResolvedMethodSymbol *methodSymbol, TR::Compilation *comp)
: Base(methodSymbol, static_cast<TR_ResolvedJ9Method*>(methodSymbol->getResolvedMethod()), comp)
{}
TR_J9ByteCodeIterator(TR::ResolvedMethodSymbol *methodSymbol, TR_ResolvedJ9Method *method, TR_J9VMBase * fe, TR::Compilation * comp) :
Base(methodSymbol, method, comp)
{
initialize(method, fe);
}
void initialize(TR_ResolvedJ9Method *, TR_J9VMBase *);
int32_t defaultTargetIndex() { return (int32_t)(_bcIndex + 1 + ((4 - ((intptr_t)&_code[_bcIndex+1] & 3)) & 3)); }
bool isThisChanged();
int32_t findFloatingPointInstruction();
int32_t nextSwitchValue(int32_t & bcIndex);
static int32_t size(TR_J9ByteCode bc)
{
return _byteCodeFlags[bc] & SizeMask;
}
TR_J9ByteCode first()
{
_bcIndex = 0;
return current();
}
TR_J9ByteCode next()
{
int32_t size = _byteCodeFlags[_bc] & SizeMask;
if (size)
_bcIndex += size;
else
stepOverVariableSizeBC();
return current();
}
int32_t currentByteCodeIndex()
{
return _bcIndex;
}
TR_J9ByteCode current()
{
_bc = (_bcIndex >= _maxByteCodeIndex ? J9BCunknown : convertOpCodeToByteCodeEnum(_code[_bcIndex]));
TR_ASSERT_FATAL(_bcIndex >= _maxByteCodeIndex || _bc != J9BCunknown, "Unknown bytecode to JIT %d \n", _code[_bcIndex]);
return _bc;
}
static TR_J9ByteCode convertOpCodeToByteCodeEnum(uint8_t opcode)
{
return _opCodeToByteCodeEnum[opcode];
}
uint32_t estimatedCodeSize() { return estimatedCodeSize(current()); }
static uint32_t estimatedCodeSize(TR_J9ByteCode bc) { return _estimatedCodeSize[bc]; }
bool isBranch() { return (_byteCodeFlags[_bc] & Branch) != 0; }
int32_t relativeBranch() { TR_ASSERT((_byteCodeFlags[_bc] & Absolute) == 0, "assertion failure"); return (_byteCodeFlags[_bc] & TwoByteOffset) ? next2BytesSigned() : next4BytesSigned(); }
int32_t absoluteBranch() { TR_ASSERT((_byteCodeFlags[_bc] & Absolute) != 0, "assertion failure"); return (_byteCodeFlags[_bc] & TwoByteOffset) ? next2Bytes() : next4Bytes(); }
int32_t branchDestination(int32_t base) { TR_ASSERT((_byteCodeFlags[_bc] & Branch) != 0, "assertion failure"); return ((_byteCodeFlags[_bc] & Absolute) != 0) ? absoluteBranch() : base + relativeBranch(); }
uint8_t nextByte(int32_t o = 1) { return _code[_bcIndex + o]; }
int8_t nextByteSigned(int32_t o = 1) { return nextByte(o); }
#if defined(NETWORK_ORDER_BYTECODE)
uint16_t next2Bytes(int32_t o = 1) { return nextByte(o) << 8 | nextByte(o + 1); }
uint32_t next4Bytes(int32_t o = 1) { return nextByte(o) << 24 | nextByte(o + 1) << 16 |
nextByte(o + 2) << 8 |
nextByte(o + 3); }
int16_t next2BytesSigned(int32_t o = 1) { return next2Bytes(o); }
int32_t next4BytesSigned(int32_t o = 1) { return next4Bytes(o); }
#else
uint16_t next2Bytes(int32_t o = 1) { return *((uint16_t*)&_code[_bcIndex + o]); }
uint32_t next4Bytes(int32_t o = 1) { return *((uint32_t*)&_code[_bcIndex + o]); }
int16_t next2BytesSigned(int32_t o = 1) { return next2Bytes(o); }
int32_t next4BytesSigned(int32_t o = 1) { return next4Bytes(o); }
#endif
protected:
void stepOverVariableSizeBC();
void printFirst(int32_t i);
void printCPIndex(int32_t i);
void printConstant(int32_t i);
void printConstant(double d);
void printFirstAndConstant(int32_t i, int32_t j);
void printJumpIndex(int32_t offset);
void printByteCodePrologue();
void printByteCode();
void printByteCodeEpilogue();
TR_J9VMBase *fe() { return _fe; }
//TR_ResolvedJ9Method *method() { return _method; }
//TR_ResolvedJ9Method * _method;
TR_J9VMBase * _fe;
const uint8_t * _code;
TR_J9ByteCode _bc; // TODO: remove this field, Replace uses with call to current()
static const uint8_t _byteCodeFlags[];
static const TR_J9ByteCode _opCodeToByteCodeEnum[256];
static const uint8_t _estimatedCodeSize[];
static TR::ILOpCodes _lcmpOps[];
static TR::ILOpCodes _fcmplOps[];
static TR::ILOpCodes _fcmpgOps[];
static TR::ILOpCodes _dcmplOps[];
static TR::ILOpCodes _dcmpgOps[];
};
#endif