100 lines
2.7 KiB
Java
100 lines
2.7 KiB
Java
/*******************************************************************************
|
|
* Copyright (c) 2002,2006 IBM Corporation.
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
* which accompanies this distribution, and is available at
|
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
*
|
|
* Contributors:
|
|
* IBM Corporation - initial API and implementation
|
|
*******************************************************************************/
|
|
package com.ibm.wala.shrikeCT;
|
|
|
|
/**
|
|
* This attribute reader reads Code attributes from methods.
|
|
*/
|
|
public final class CodeReader extends AttributeReader {
|
|
final private int codeLen;
|
|
|
|
final private int exnTableLen;
|
|
|
|
public CodeReader(ClassReader.AttrIterator iter) throws InvalidClassFileException {
|
|
super(iter, "Code");
|
|
|
|
int offset = attr + 6;
|
|
checkSize(offset, 8);
|
|
codeLen = cr.getInt(offset + 4);
|
|
offset += 8;
|
|
|
|
checkSize(offset, codeLen + 2);
|
|
offset += codeLen;
|
|
exnTableLen = cr.getUShort(offset);
|
|
offset += 2;
|
|
checkSize(offset, exnTableLen * 8 + 2);
|
|
offset += exnTableLen * 8;
|
|
int attrCount = cr.getUShort(offset);
|
|
offset += 2;
|
|
for (int i = 0; i < attrCount; i++) {
|
|
checkSize(offset, 6);
|
|
int len = cr.getInt(offset + 2);
|
|
offset += 6;
|
|
checkSize(offset, len);
|
|
offset += len;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @return the maximum stack size used by the code, in words
|
|
*/
|
|
public int getMaxStack() {
|
|
return cr.getUShort(attr + 6);
|
|
}
|
|
|
|
/**
|
|
* @return the maximum local variable size used by the code, in words
|
|
*/
|
|
public int getMaxLocals() {
|
|
return cr.getUShort(attr + 8);
|
|
}
|
|
|
|
/**
|
|
* @return the length of the bytecode array, in bytes
|
|
*/
|
|
public int getBytecodeLength() {
|
|
return codeLen;
|
|
}
|
|
|
|
/**
|
|
* @return the bytecode bytes
|
|
*/
|
|
public byte[] getBytecode() {
|
|
byte[] r = new byte[codeLen];
|
|
System.arraycopy(cr.getBytes(), attr + 14, r, 0, r.length);
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* @return the raw exception handler data, a flattened sequence of (startPC, endPC, catchClassIndex, catchPC) tuples
|
|
*/
|
|
public int[] getRawHandlers() {
|
|
int[] r = new int[exnTableLen * 4];
|
|
int offset = attr + 14 + codeLen + 2;
|
|
for (int i = 0; i < r.length; i++) {
|
|
r[i] = cr.getUShort(offset);
|
|
offset += 2;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/**
|
|
* Point iter at the list of attributes for this code.
|
|
*
|
|
* @throws IllegalArgumentException if iter is null
|
|
*/
|
|
public void initAttributeIterator(ClassReader.AttrIterator iter) {
|
|
if (iter == null) {
|
|
throw new IllegalArgumentException("iter is null");
|
|
}
|
|
iter.init(cr, attr + 14 + codeLen + 2 + exnTableLen * 8);
|
|
}
|
|
} |