org.jetbrains.java.decompiler.struct.attr.StructLineNumberTableAttribute Maven / Gradle / Ivy
/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.java.decompiler.struct.attr;
import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
import org.jetbrains.java.decompiler.util.DataInputFullStream;
import org.jetbrains.java.decompiler.util.InterpreterUtil;
import java.io.IOException;
/**
* u2 line_number_table_length;
* { u2 start_pc;
* u2 line_number;
* } line_number_table[line_number_table_length];
*
* Created by Egor on 05.10.2014.
*/
public class StructLineNumberTableAttribute extends StructGeneralAttribute {
private int[] myLineInfo = InterpreterUtil.EMPTY_INT_ARRAY;
@Override
public void initContent(ConstantPool pool) throws IOException {
DataInputFullStream data = stream();
int len = data.readUnsignedShort() * 2;
if (len > 0) {
myLineInfo = new int[len];
for (int i = 0; i < len; i += 2) {
myLineInfo[i] = data.readUnsignedShort();
myLineInfo[i + 1] = data.readUnsignedShort();
}
}
else if (myLineInfo.length > 0) {
myLineInfo = InterpreterUtil.EMPTY_INT_ARRAY;
}
}
public int getFirstLine() {
return myLineInfo.length > 0 ? myLineInfo[1] : -1;
}
public int findLineNumber(int pc) {
if (myLineInfo.length >= 2) {
for (int i = myLineInfo.length - 2; i >= 0; i -= 2) {
if (pc >= myLineInfo[i]) {
return myLineInfo[i + 1];
}
}
}
return -1;
}
public int[] getRawData() {
return myLineInfo;
}
}