org.eclipse.jdt.internal.core.util.StackMapAttribute Maven / Gradle / Ivy
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/*******************************************************************************
* Copyright (c) 2000, 2009 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
*******************************************************************************/
package org.eclipse.jdt.internal.core.util;
import org.eclipse.jdt.core.util.ClassFormatException;
import org.eclipse.jdt.core.util.IConstantPool;
import org.eclipse.jdt.core.util.IStackMapFrame;
import org.eclipse.jdt.core.util.IStackMapAttribute;
/**
* Default implementation of IStackMapAttribute.
* @see IStackMapAttribute
*/
public class StackMapAttribute
extends ClassFileAttribute
implements IStackMapAttribute {
private static final IStackMapFrame[] NO_FRAMES = new IStackMapFrame[0];
private static final byte[] NO_ENTRIES = new byte[0];
private final int numberOfEntries;
private IStackMapFrame[] frames;
private byte[] bytes;
/**
* Constructor for LineNumberAttribute.
*/
public StackMapAttribute(
byte[] classFileBytes,
IConstantPool constantPool,
int offset)
throws ClassFormatException {
super(classFileBytes, constantPool, offset);
final int length = u2At(classFileBytes, 6, offset);
this.numberOfEntries = length;
if (length != 0) {
int readOffset = 8;
this.frames = new IStackMapFrame[length];
for (int i = 0; i < length; i++) {
DefaultStackMapFrame frame = new DefaultStackMapFrame(classFileBytes, constantPool, offset + readOffset);
this.frames[i] = frame;
readOffset += frame.sizeInBytes();
}
} else {
this.frames = NO_FRAMES;
}
final int byteLength = (int) u4At(classFileBytes, 2, offset);
if (length != 0) {
System.arraycopy(classFileBytes, offset + 6, this.bytes = new byte[byteLength], 0, byteLength);
} else {
this.bytes = NO_ENTRIES;
}
}
@Override
public int getNumberOfEntries() {
return this.numberOfEntries;
}
@Override
public IStackMapFrame[] getStackMapFrame() {
return this.frames;
}
public byte[] getBytes() {
return this.bytes;
}
}