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81 lines
2.5 KiB
81 lines
2.5 KiB
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.harmony.pack200;
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import org.objectweb.asm.ClassReader;
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/**
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* Wrapper for ClassReader that enables pack200 to obtain extra class file
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* information
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*/
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public class Pack200ClassReader extends ClassReader {
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private boolean lastConstantHadWideIndex;
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private int lastUnsignedShort;
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private boolean anySyntheticAttributes;
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private String fileName;
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/**
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* @param b
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* the contents of class file in the format of bytes
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*/
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public Pack200ClassReader(byte[] b) {
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super(b);
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}
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public int readUnsignedShort(int index) {
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// Doing this to check whether last load-constant instruction was ldc (18) or ldc_w (19)
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// TODO: Assess whether this impacts on performance
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int unsignedShort = super.readUnsignedShort(index);
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if(index > 0 && b[index - 1] == 19) {
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lastUnsignedShort = unsignedShort;
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} else {
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lastUnsignedShort = Short.MIN_VALUE;
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}
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return unsignedShort;
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}
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public Object readConst(int item, char[] buf) {
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lastConstantHadWideIndex = item == lastUnsignedShort;
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return super.readConst(item, buf);
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}
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public String readUTF8(int arg0, char[] arg1) {
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String utf8 = super.readUTF8(arg0, arg1);
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if(!anySyntheticAttributes && "Synthetic".equals(utf8)) {
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anySyntheticAttributes = true;
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}
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return utf8;
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}
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public boolean lastConstantHadWideIndex() {
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return lastConstantHadWideIndex;
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}
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public boolean hasSyntheticAttributes() {
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return anySyntheticAttributes;
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}
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public void setFileName(String name) {
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this.fileName = name;
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}
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public String getFileName() {
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return fileName;
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}
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}
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