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/*
* This file is part of fabric-loom, licensed under the MIT License (MIT).
*
* Copyright (c) 2019-2021 FabricMC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package net.fabricmc.loom.decompilers;
import static java.text.MessageFormat.format;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.StandardCopyOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.HashMap;
import java.util.Map;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import net.fabricmc.loom.util.Constants;
import net.fabricmc.loom.util.IOStringConsumer;
/**
* Created by covers1624 on 18/02/19.
*/
public class LineNumberRemapper {
private final Map<String, RClass> lineMap = new HashMap<>();
public void readMappings(File lineMappings) {
try (BufferedReader reader = new BufferedReader(new FileReader(lineMappings))) {
RClass clazz = null;
String line = null;
int i = 0;
try {
while ((line = reader.readLine()) != null) {
if (line.isEmpty()) {
continue;
}
String[] segs = line.trim().split("\t");
if (line.charAt(0) != '\t') {
clazz = lineMap.computeIfAbsent(segs[0], RClass::new);
clazz.maxLine = Integer.parseInt(segs[1]);
clazz.maxLineDest = Integer.parseInt(segs[2]);
} else {
clazz.lineMap.put(Integer.parseInt(segs[0]), Integer.parseInt(segs[1]));
}
i++;
}
} catch (Exception e) {
throw new RuntimeException(format("Exception reading mapping line @{0}: {1}", i, line), e);
}
} catch (IOException e) {
throw new RuntimeException("Exception reading LineMappings file.", e);
}
}
public void process(IOStringConsumer logger, Path input, Path output) throws IOException {
Files.walkFileTree(input, new SimpleFileVisitor<>() {
@Override
public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
String rel = input.relativize(file).toString();
Path dst = output.resolve(rel);
Path parent = dst.getParent();
if (parent != null) {
Files.createDirectories(parent);
}
String fName = file.getFileName().toString();
if (fName.endsWith(".class")) {
if (Files.exists(dst)) {
Files.delete(dst);
}
String idx = rel.substring(0, rel.length() - 6);
if (logger != null) {
logger.accept("Remapping " + idx);
}
int dollarPos = idx.indexOf('$'); //This makes the assumption that only Java classes are to be remapped.
if (dollarPos >= 0) {
idx = idx.substring(0, dollarPos);
}
if (lineMap.containsKey(idx)) {
try (InputStream is = Files.newInputStream(file)) {
ClassReader reader = new ClassReader(is);
ClassWriter writer = new ClassWriter(0);
reader.accept(new LineNumberVisitor(Constants.ASM_VERSION, writer, lineMap.get(idx)), 0);
Files.write(dst, writer.toByteArray());
return FileVisitResult.CONTINUE;
}
}
}
Files.copy(file, dst, StandardCopyOption.REPLACE_EXISTING);
return FileVisitResult.CONTINUE;
}
});
}
private static class LineNumberVisitor extends ClassVisitor {
private final RClass rClass;
LineNumberVisitor(int api, ClassVisitor classVisitor, RClass rClass) {
super(api, classVisitor);
this.rClass = rClass;
}
@Override
public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
return new MethodVisitor(api, super.visitMethod(access, name, descriptor, signature, exceptions)) {
@Override
public void visitLineNumber(int line, Label start) {
int tLine = line;
if (tLine <= 0) {
super.visitLineNumber(line, start);
} else if (tLine >= rClass.maxLine) {
super.visitLineNumber(rClass.maxLineDest, start);
} else {
Integer matchedLine = null;
while (tLine <= rClass.maxLine && ((matchedLine = rClass.lineMap.get(tLine)) == null)) {
tLine++;
}
super.visitLineNumber(matchedLine != null ? matchedLine : rClass.maxLineDest, start);
}
}
};
}
}
private static class RClass {
private final String name;
private int maxLine;
private int maxLineDest;
private final Map<Integer, Integer> lineMap = new HashMap<>();
private RClass(String name) {
this.name = name;
}
}
}
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