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Code Issues Releases Wiki Activity

decompiler: support line number table attribute

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This commit is contained in:
Egor Ushakov 2014-10-05 16:28:44 +04:00
parent 512a08c13e
commit 0c8508ff8a
2 changed files with 73 additions and 0 deletions
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4
src/org/jetbrains/java/decompiler/struct/attr/StructGeneralAttribute.java
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@ -46,6 +46,7 @@ public class StructGeneralAttribute {
public static final String ATTRIBUTE_BOOTSTRAP_METHODS = "BootstrapMethods";
public static final String ATTRIBUTE_SYNTHETIC = "Synthetic";
public static final String ATTRIBUTE_DEPRECATED = "Deprecated";
public static final String ATTRIBUTE_LINE_NUMBER_TABLE = "LineNumberTable";
private String name;
private byte[] info;
@ -93,6 +94,9 @@ public class StructGeneralAttribute {
ATTRIBUTE_DEPRECATED.equals(name)) {
attr = new StructGeneralAttribute();
}
else if (ATTRIBUTE_LINE_NUMBER_TABLE.equals(name)) {
attr = new StructLineNumberTableAttribute();
}
else {
// unsupported attribute
return null;

69
src/org/jetbrains/java/decompiler/struct/attr/StructLineNumberTableAttribute.java Normal file
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@ -0,0 +1,69 @@
/*
* 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 com.intellij.openapi.util.Pair;
import org.jetbrains.java.decompiler.struct.consts.ConstantPool;
import org.jetbrains.java.decompiler.util.DataInputFullStream;
import java.io.IOException;
import java.util.*;
/**
* 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 List<Pair<Integer, Integer>> myLineInfo = Collections.emptyList();
@Override
public void initContent(ConstantPool pool) throws IOException {
DataInputFullStream data = stream();
int len = data.readUnsignedShort();
if (len > 0) {
myLineInfo = new ArrayList<Pair<Integer, Integer>>(len);
for (int i = 0; i < len; i++) {
int startPC = data.readUnsignedShort();
int lineNumber = data.readUnsignedShort();
myLineInfo.add(Pair.create(startPC, lineNumber));
}
}
else {
myLineInfo = Collections.emptyList();
}
}
public int getFirstLine() {
if (!myLineInfo.isEmpty()) {
return myLineInfo.get(0).getSecond();
}
return -1;
}
public int findLineNumber(int pc) {
for (Pair<Integer, Integer> pair : myLineInfo) {
if (pc >= pair.getFirst()) {
return pair.getSecond();
}
}
return -1;
}
}