Copyright (c) 2000, 2018 IBM Corporation and others.
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/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
       Andy Clement (GoPivotal, Inc) aclement@gopivotal.com - Contributions for
                         Bug 383624 - [1.8][compiler] Revive code generation support for type annotations (from Olivier's work)
/*******************************************************************************
 * Copyright (c) 2000, 2018 IBM Corporation and others.
 *
 * 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/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *        Andy Clement (GoPivotal, Inc) aclement@gopivotal.com - Contributions for
 *                          Bug 383624 - [1.8][compiler] Revive code generation support for type annotations (from Olivier's work)
 *******************************************************************************/
package org.eclipse.jdt.internal.core.util;

import org.eclipse.jdt.core.util.ClassFormatException;
import org.eclipse.jdt.core.util.IAttributeNamesConstants;
import org.eclipse.jdt.core.util.IBytecodeVisitor;
import org.eclipse.jdt.core.util.IClassFileAttribute;
import org.eclipse.jdt.core.util.ICodeAttribute;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IConstantPoolConstant;
import org.eclipse.jdt.core.util.IConstantPoolEntry;
import org.eclipse.jdt.core.util.IExceptionTableEntry;
import org.eclipse.jdt.core.util.ILineNumberAttribute;
import org.eclipse.jdt.core.util.ILocalVariableAttribute;
import org.eclipse.jdt.core.util.IOpcodeMnemonics;

Default implementation of ICodeAttribute.
/**
 * Default implementation of ICodeAttribute.
 */
public class CodeAttribute extends ClassFileAttribute implements ICodeAttribute {
	private static final IExceptionTableEntry[] NO_EXCEPTION_TABLE = new IExceptionTableEntry[0];
	private IClassFileAttribute[] attributes;
	private int attributesCount;
	private byte[] bytecodes;
	private byte[] classFileBytes;
	private long codeLength;
	private int codeOffset;
	private IConstantPool constantPool;
	private IExceptionTableEntry[] exceptionTableEntries;
	private int exceptionTableLength;
	private ILineNumberAttribute lineNumberAttribute;
	private ILocalVariableAttribute localVariableAttribute;
	private int maxLocals;
	private int maxStack;

	CodeAttribute(byte[] classFileBytes, IConstantPool constantPool, int offset) throws ClassFormatException {
		super(classFileBytes, constantPool, offset);
		this.classFileBytes = classFileBytes;
		this.constantPool = constantPool;
		this.maxStack = u2At(classFileBytes, 6, offset);
		this.maxLocals = u2At(classFileBytes, 8, offset);
		this.codeLength = u4At(classFileBytes, 10, offset);
		this.codeOffset = offset + 14;
		int readOffset = (int) (14 + this.codeLength);
		this.exceptionTableLength = u2At(classFileBytes, readOffset, offset);
		readOffset += 2;
		this.exceptionTableEntries = NO_EXCEPTION_TABLE;
		if (this.exceptionTableLength != 0) {
			this.exceptionTableEntries = new ExceptionTableEntry[this.exceptionTableLength];
			for (int i = 0; i < this.exceptionTableLength; i++) {
				this.exceptionTableEntries [i] = new ExceptionTableEntry(classFileBytes, constantPool, offset + readOffset);
				readOffset += 8;
			}
		}
		this.attributesCount = u2At(classFileBytes, readOffset, offset);
		this.attributes = ClassFileAttribute.NO_ATTRIBUTES;
		if (this.attributesCount != 0) {
			this.attributes = new IClassFileAttribute[this.attributesCount];
		}
		int attributesIndex = 0;
		readOffset += 2;
		for (int i = 0; i < this.attributesCount; i++) {
			IConstantPoolEntry constantPoolEntry = constantPool.decodeEntry(u2At(classFileBytes, readOffset, offset));
			if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Utf8) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
			}
			char[] attributeName = constantPoolEntry.getUtf8Value();
			if (equals(attributeName, IAttributeNamesConstants.LINE_NUMBER)) {
				this.lineNumberAttribute = new LineNumberAttribute(classFileBytes, constantPool, offset + readOffset);
				this.attributes[attributesIndex++] = this.lineNumberAttribute;
			} else if (equals(attributeName, IAttributeNamesConstants.LOCAL_VARIABLE)) {
				this.localVariableAttribute = new LocalVariableAttribute(classFileBytes, constantPool, offset + readOffset);
				this.attributes[attributesIndex++] = this.localVariableAttribute;
			} else if (equals(attributeName, IAttributeNamesConstants.LOCAL_VARIABLE_TYPE_TABLE)) {
				this.attributes[attributesIndex++] = new LocalVariableTypeAttribute(classFileBytes, constantPool, offset + readOffset);
			} else if (equals(attributeName, IAttributeNamesConstants.STACK_MAP_TABLE)) {
				this.attributes[attributesIndex++] = new StackMapTableAttribute(classFileBytes, constantPool, offset + readOffset);
			} else if (equals(attributeName, IAttributeNamesConstants.STACK_MAP)) {
				this.attributes[attributesIndex++] = new StackMapAttribute(classFileBytes, constantPool, offset + readOffset);
			} else if (equals(attributeName, IAttributeNamesConstants.RUNTIME_VISIBLE_TYPE_ANNOTATIONS)) {
				this.attributes[attributesIndex++] = new RuntimeVisibleTypeAnnotationsAttribute(classFileBytes, constantPool, offset + readOffset);
			} else if (equals(attributeName, IAttributeNamesConstants.RUNTIME_INVISIBLE_TYPE_ANNOTATIONS)) {
				this.attributes[attributesIndex++] = new RuntimeInvisibleTypeAnnotationsAttribute(classFileBytes, constantPool, offset + readOffset);
			} else {
				this.attributes[attributesIndex++] = new ClassFileAttribute(classFileBytes, constantPool, offset + readOffset);
			}
			readOffset += (6 + u4At(classFileBytes, readOffset + 2, offset));
		}
	}
	
See Also:
getAttributes.getAttributes()/**
	 * @see ICodeAttribute#getAttributes()
	 */
	@Override
	public IClassFileAttribute[] getAttributes() {
		return this.attributes;
	}

	
See Also:
getAttributesCount.getAttributesCount()/**
	 * @see ICodeAttribute#getAttributesCount()
	 */
	@Override
	public int getAttributesCount() {
		return this.attributesCount;
	}

	
See Also:
getBytecodes.getBytecodes()/**
	 * @see ICodeAttribute#getBytecodes()
	 */
	@Override
	public byte[] getBytecodes() {
		if (this.bytecodes == null) {
			System.arraycopy(this.classFileBytes, this.codeOffset, (this.bytecodes = new byte[(int) this.codeLength]), 0, (int) this.codeLength);
		}
		return this.bytecodes;
	}

	
See Also:
getCodeLength.getCodeLength()/**
	 * @see ICodeAttribute#getCodeLength()
	 */
	@Override
	public long getCodeLength() {
		return this.codeLength;
	}

	
See Also:
getExceptionTable.getExceptionTable()/**
	 * @see ICodeAttribute#getExceptionTable()
	 */
	@Override
	public IExceptionTableEntry[] getExceptionTable() {
		return this.exceptionTableEntries;
	}

	
See Also:
getExceptionTableLength.getExceptionTableLength()/**
	 * @see ICodeAttribute#getExceptionTableLength()
	 */
	@Override
	public int getExceptionTableLength() {
		return this.exceptionTableLength;
	}

	
See Also:
getLineNumberAttribute.getLineNumberAttribute()/**
	 * @see ICodeAttribute#getLineNumberAttribute()
	 */
	@Override
	public ILineNumberAttribute getLineNumberAttribute() {
		return this.lineNumberAttribute;
	}

	
See Also:
getLocalVariableAttribute.getLocalVariableAttribute()/**
	 * @see ICodeAttribute#getLocalVariableAttribute()
	 */
	@Override
	public ILocalVariableAttribute getLocalVariableAttribute() {
		return this.localVariableAttribute;
	}

	
See Also:
getMaxLocals.getMaxLocals()/**
	 * @see ICodeAttribute#getMaxLocals()
	 */
	@Override
	public int getMaxLocals() {
		return this.maxLocals;
	}

	
See Also:
getMaxStack.getMaxStack()/**
	 * @see ICodeAttribute#getMaxStack()
	 */
	@Override
	public int getMaxStack() {
		return this.maxStack;
	}

	
See Also:
traverse.traverse(IBytecodeVisitor visitor)/**
	 * @see ICodeAttribute#traverse(IBytecodeVisitor visitor)
	 */
	@Override
	public void traverse(IBytecodeVisitor visitor) throws ClassFormatException {
		int pc = this.codeOffset;
		int opcode, index, _const, branchOffset;
		IConstantPoolEntry constantPoolEntry;
		while (true) {
			opcode = u1At(this.classFileBytes, 0, pc);
			switch(opcode) {
				case IOpcodeMnemonics.NOP :
					visitor._nop(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ACONST_NULL :
					visitor._aconst_null(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_M1 :
					visitor._iconst_m1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_0 :
					visitor._iconst_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_1 :
					visitor._iconst_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_2 :
					visitor._iconst_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_3 :
					visitor._iconst_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_4 :
					visitor._iconst_4(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ICONST_5 :
					visitor._iconst_5(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LCONST_0 :
					visitor._lconst_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LCONST_1 :
					visitor._lconst_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FCONST_0 :
					visitor._fconst_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FCONST_1 :
					visitor._fconst_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FCONST_2 :
					visitor._fconst_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DCONST_0 :
					visitor._dconst_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DCONST_1 :
					visitor._dconst_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.BIPUSH :
					visitor._bipush(pc - this.codeOffset, (byte) i1At(this.classFileBytes, 1, pc));
					pc+=2;
					break;
				case IOpcodeMnemonics.SIPUSH :
					visitor._sipush(pc - this.codeOffset, (short) i2At(this.classFileBytes, 1, pc));
					pc+=3;
					break;
				case IOpcodeMnemonics.LDC :
					index = u1At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					checkConstantAndThrow(constantPoolEntry.getKind());
					visitor._ldc(pc - this.codeOffset, index, constantPoolEntry);
					pc+=2;
					break;
				case IOpcodeMnemonics.LDC_W :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					checkConstantAndThrow(constantPoolEntry.getKind());
					visitor._ldc_w(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.LDC2_W :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Double
						&& constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Long) {
							throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._ldc2_w(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.ILOAD :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._iload(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.LLOAD :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._lload(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.FLOAD :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._fload(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.DLOAD :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._dload(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.ALOAD :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._aload(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.ILOAD_0 :
					visitor._iload_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ILOAD_1 :
					visitor._iload_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ILOAD_2 :
					visitor._iload_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ILOAD_3 :
					visitor._iload_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LLOAD_0 :
					visitor._lload_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LLOAD_1 :
					visitor._lload_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LLOAD_2 :
					visitor._lload_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LLOAD_3 :
					visitor._lload_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FLOAD_0 :
					visitor._fload_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FLOAD_1 :
					visitor._fload_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FLOAD_2 :
					visitor._fload_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FLOAD_3 :
					visitor._fload_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DLOAD_0 :
					visitor._dload_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DLOAD_1 :
					visitor._dload_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DLOAD_2 :
					visitor._dload_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DLOAD_3 :
					visitor._dload_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ALOAD_0 :
					visitor._aload_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ALOAD_1 :
					visitor._aload_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ALOAD_2 :
					visitor._aload_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ALOAD_3 :
					visitor._aload_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IALOAD :
					visitor._iaload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LALOAD :
					visitor._laload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FALOAD :
					visitor._faload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DALOAD :
					visitor._daload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.AALOAD :
					visitor._aaload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.BALOAD :
					visitor._baload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.CALOAD :
					visitor._caload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.SALOAD :
					visitor._saload(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISTORE :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._istore(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.LSTORE :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._lstore(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.FSTORE :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._fstore(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.DSTORE :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._dstore(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.ASTORE :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._astore(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.ISTORE_0 :
					visitor._istore_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISTORE_1 :
					visitor._istore_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISTORE_2 :
					visitor._istore_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISTORE_3 :
					visitor._istore_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSTORE_0 :
					visitor._lstore_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSTORE_1 :
					visitor._lstore_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSTORE_2 :
					visitor._lstore_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSTORE_3 :
					visitor._lstore_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FSTORE_0 :
					visitor._fstore_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FSTORE_1 :
					visitor._fstore_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FSTORE_2 :
					visitor._fstore_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FSTORE_3 :
					visitor._fstore_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DSTORE_0 :
					visitor._dstore_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DSTORE_1 :
					visitor._dstore_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DSTORE_2 :
					visitor._dstore_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DSTORE_3 :
					visitor._dstore_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ASTORE_0 :
					visitor._astore_0(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ASTORE_1 :
					visitor._astore_1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ASTORE_2 :
					visitor._astore_2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ASTORE_3 :
					visitor._astore_3(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IASTORE :
					visitor._iastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LASTORE :
					visitor._lastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FASTORE :
					visitor._fastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DASTORE :
					visitor._dastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.AASTORE :
					visitor._aastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.BASTORE :
					visitor._bastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.CASTORE :
					visitor._castore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.SASTORE :
					visitor._sastore(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.POP :
					visitor._pop(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.POP2 :
					visitor._pop2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP :
					visitor._dup(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP_X1 :
					visitor._dup_x1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP_X2 :
					visitor._dup_x2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP2 :
					visitor._dup2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP2_X1 :
					visitor._dup2_x1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DUP2_X2 :
					visitor._dup2_x2(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.SWAP :
					visitor._swap(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IADD :
					visitor._iadd(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LADD :
					visitor._ladd(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FADD :
					visitor._fadd(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DADD :
					visitor._dadd(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISUB :
					visitor._isub(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSUB :
					visitor._lsub(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FSUB :
					visitor._fsub(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DSUB :
					visitor._dsub(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IMUL :
					visitor._imul(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LMUL :
					visitor._lmul(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FMUL :
					visitor._fmul(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DMUL :
					visitor._dmul(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IDIV :
					visitor._idiv(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LDIV :
					visitor._ldiv(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FDIV :
					visitor._fdiv(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DDIV :
					visitor._ddiv(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IREM :
					visitor._irem(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LREM :
					visitor._lrem(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FREM :
					visitor._frem(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DREM :
					visitor._drem(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.INEG :
					visitor._ineg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LNEG :
					visitor._lneg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FNEG :
					visitor._fneg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DNEG :
					visitor._dneg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISHL :
					visitor._ishl(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSHL :
					visitor._lshl(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ISHR :
					visitor._ishr(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LSHR :
					visitor._lshr(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IUSHR :
					visitor._iushr(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LUSHR :
					visitor._lushr(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IAND :
					visitor._iand(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LAND :
					visitor._land(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IOR :
					visitor._ior(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LOR :
					visitor._lor(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IXOR :
					visitor._ixor(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LXOR :
					visitor._lxor(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IINC :
					index = u1At(this.classFileBytes, 1, pc);
					_const = i1At(this.classFileBytes, 2, pc);
					visitor._iinc(pc - this.codeOffset, index, _const);
					pc+=3;
					break;
				case IOpcodeMnemonics.I2L :
					visitor._i2l(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.I2F :
					visitor._i2f(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.I2D :
					visitor._i2d(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.L2I :
					visitor._l2i(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.L2F :
					visitor._l2f(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.L2D :
					visitor._l2d(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.F2I :
					visitor._f2i(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.F2L :
					visitor._f2l(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.F2D :
					visitor._f2d(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.D2I :
					visitor._d2i(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.D2L :
					visitor._d2l(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.D2F :
					visitor._d2f(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.I2B :
					visitor._i2b(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.I2C :
					visitor._i2c(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.I2S :
					visitor._i2s(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LCMP :
					visitor._lcmp(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FCMPL :
					visitor._fcmpl(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FCMPG :
					visitor._fcmpg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DCMPL :
					visitor._dcmpl(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DCMPG :
					visitor._dcmpg(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IFEQ :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifeq(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFNE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifne(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFLT :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._iflt(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFGE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifge(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFGT :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifgt(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFLE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifle(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPEQ :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmpeq(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPNE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmpne(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPLT :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmplt(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPGE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmpge(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPGT :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmpgt(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ICMPLE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_icmple(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ACMPEQ :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_acmpeq(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IF_ACMPNE :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._if_acmpne(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.GOTO :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._goto(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.JSR :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._jsr(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.RET :
					index = u1At(this.classFileBytes, 1, pc);
					visitor._ret(pc - this.codeOffset, index);
					pc+=2;
					break;
				case IOpcodeMnemonics.TABLESWITCH :
					int startpc = pc;
					pc++;
					while (((pc - this.codeOffset) & 0x03) != 0) { // faster than % 4
						pc++;
					}
					int defaultOffset = i4At(this.classFileBytes, 0, pc);
					pc += 4;
					int low = i4At(this.classFileBytes, 0, pc);
					pc += 4;
					int high = i4At(this.classFileBytes, 0, pc);
					pc += 4;
					int length = high - low + 1;
					int[] jumpOffsets = new int[length];
					for (int i = 0; i < length; i++) {
						jumpOffsets[i] = i4At(this.classFileBytes, 0, pc);
						pc += 4;
					}
					visitor._tableswitch(startpc - this.codeOffset, defaultOffset, low, high, jumpOffsets);
					break;
				case IOpcodeMnemonics.LOOKUPSWITCH :
					startpc = pc;
					pc++;
					while (((pc - this.codeOffset) & 0x03) != 0) {
						pc++;
					}
					defaultOffset = i4At(this.classFileBytes, 0, pc);
					pc += 4;
					int npairs = (int) u4At(this.classFileBytes, 0, pc);
					int[][] offset_pairs = new int[npairs][2];
					pc += 4;
					for (int i = 0; i < npairs; i++) {
						offset_pairs[i][0] = i4At(this.classFileBytes, 0, pc);
						pc += 4;
						offset_pairs[i][1] = i4At(this.classFileBytes, 0, pc);
						pc += 4;
					}
					visitor._lookupswitch(startpc - this.codeOffset, defaultOffset, npairs, offset_pairs);
					break;
				case IOpcodeMnemonics.IRETURN :
					visitor._ireturn(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.LRETURN :
					visitor._lreturn(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.FRETURN :
					visitor._freturn(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.DRETURN :
					visitor._dreturn(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ARETURN :
					visitor._areturn(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.RETURN :
					visitor._return(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.GETSTATIC :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Fieldref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._getstatic(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.PUTSTATIC :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Fieldref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._putstatic(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.GETFIELD :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Fieldref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._getfield(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.PUTFIELD :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Fieldref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._putfield(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.INVOKEVIRTUAL :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Methodref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._invokevirtual(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.INVOKESPECIAL :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Methodref
							&& constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_InterfaceMethodref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._invokespecial(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.INVOKESTATIC :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Methodref
							&& constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_InterfaceMethodref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._invokestatic(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.INVOKEINTERFACE :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_InterfaceMethodref) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					byte count = (byte) u1At(this.classFileBytes, 3, pc);
					int extraArgs = u1At(this.classFileBytes, 4, pc);
					if (extraArgs != 0) {
						throw new ClassFormatException(ClassFormatException.INVALID_ARGUMENTS_FOR_INVOKEINTERFACE);
					}
					visitor._invokeinterface(pc - this.codeOffset, index, count, constantPoolEntry);
					pc += 5;
					break;
				case IOpcodeMnemonics.INVOKEDYNAMIC :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_InvokeDynamic) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._invokedynamic(
							pc - this.codeOffset,
							index,
							constantPoolEntry);
					pc += 5;
					break;
				case IOpcodeMnemonics.NEW :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._new(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.NEWARRAY :
					int atype = u1At(this.classFileBytes, 1, pc);
					visitor._newarray(pc - this.codeOffset, atype);
					pc+=2;
					break;
				case IOpcodeMnemonics.ANEWARRAY :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._anewarray(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.ARRAYLENGTH :
					visitor._arraylength(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.ATHROW :
					visitor._athrow(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.CHECKCAST :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._checkcast(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.INSTANCEOF :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					visitor._instanceof(pc - this.codeOffset, index, constantPoolEntry);
					pc+=3;
					break;
				case IOpcodeMnemonics.MONITORENTER :
					visitor._monitorenter(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.MONITOREXIT :
					visitor._monitorexit(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.WIDE :
					opcode = u1At(this.classFileBytes, 1, pc);
					if (opcode == IOpcodeMnemonics.IINC) {
						index = u2At(this.classFileBytes, 2, pc);
						_const = i2At(this.classFileBytes, 4, pc);
						visitor._wide(pc - this.codeOffset, opcode, index, _const);
						pc += 6;
					} else {
						index = u2At(this.classFileBytes, 2, pc);
						visitor._wide(pc - this.codeOffset , opcode, index);
						pc += 4;
					}
					break;
				case IOpcodeMnemonics.MULTIANEWARRAY :
					index = u2At(this.classFileBytes, 1, pc);
					constantPoolEntry = this.constantPool.decodeEntry(index);
					if (constantPoolEntry.getKind() != IConstantPoolConstant.CONSTANT_Class) {
						throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
					}
					int dimensions = u1At(this.classFileBytes, 3, pc);
					visitor._multianewarray(pc - this.codeOffset, index, dimensions, constantPoolEntry);
					pc+=4;
					break;
				case IOpcodeMnemonics.IFNULL :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifnull(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.IFNONNULL :
					branchOffset = i2At(this.classFileBytes, 1, pc);
					visitor._ifnonnull(pc - this.codeOffset , branchOffset);
					pc+=3;
					break;
				case IOpcodeMnemonics.GOTO_W :
					branchOffset = i4At(this.classFileBytes, 1, pc);
					visitor._goto_w(pc - this.codeOffset, branchOffset);
					pc+=5;
					break;
				case IOpcodeMnemonics.JSR_W :
					branchOffset = i4At(this.classFileBytes, 1, pc);
					visitor._jsr_w(pc - this.codeOffset, branchOffset);
					pc+=5;
					break;
				case IOpcodeMnemonics.BREAKPOINT :
					visitor._breakpoint(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IMPDEP1 :
					visitor._impdep1(pc - this.codeOffset);
					pc++;
					break;
				case IOpcodeMnemonics.IMPDEP2 :
					visitor._impdep2(pc - this.codeOffset);
					pc++;
					break;
				default:
					throw new ClassFormatException(ClassFormatException.INVALID_BYTECODE);
			}
			if (pc >= (this.codeLength + this.codeOffset)) {
				break;
			}
		}
	}
	private void checkConstantAndThrow(int kind) throws ClassFormatException {
		if (kind == IConstantPoolConstant.CONSTANT_Long ||	kind == IConstantPoolConstant.CONSTANT_Double) {
				throw new ClassFormatException(ClassFormatException.INVALID_CONSTANT_POOL_ENTRY);
		}
	}
}