/*
* Copyright 2000-2017 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.consts;
import org.jetbrains.java.decompiler.code.CodeConstants;
import org.jetbrains.java.decompiler.main.DecompilerContext;
import org.jetbrains.java.decompiler.modules.renamer.PoolInterceptor;
import org.jetbrains.java.decompiler.struct.gen.FieldDescriptor;
import org.jetbrains.java.decompiler.struct.gen.MethodDescriptor;
import org.jetbrains.java.decompiler.struct.gen.NewClassNameBuilder;
import org.jetbrains.java.decompiler.struct.gen.VarType;
import org.jetbrains.java.decompiler.util.DataInputFullStream;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.BitSet;
import java.util.List;
@SuppressWarnings("AssignmentToForLoopParameter")
public class ConstantPool implements NewClassNameBuilder {
public static final int FIELD = 1;
public static final int METHOD = 2;
private final List<PooledConstant> pool;
private final PoolInterceptor interceptor;
public ConstantPool(DataInputStream in) throws IOException {
int size = in.readUnsignedShort();
pool = new ArrayList<>(size);
BitSet[] nextPass = {new BitSet(size), new BitSet(size), new BitSet(size)};
// first dummy constant
pool.add(null);
// first pass: read the elements
for (int i = 1; i < size; i++) {
byte tag = (byte)in.readUnsignedByte();
switch (tag) {
case CodeConstants.CONSTANT_Utf8:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Utf8, in.readUTF()));
break;
case CodeConstants.CONSTANT_Integer:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Integer, Integer.valueOf(in.readInt())));
break;
case CodeConstants.CONSTANT_Float:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Float, Float.valueOf(in.readFloat())));
break;
case CodeConstants.CONSTANT_Long:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Long, Long.valueOf(in.readLong())));
pool.add(null);
i++;
break;
case CodeConstants.CONSTANT_Double:
pool.add(new PrimitiveConstant(CodeConstants.CONSTANT_Double, Double.valueOf(in.readDouble())));
pool.add(null);
i++;
break;
case CodeConstants.CONSTANT_Class:
case CodeConstants.CONSTANT_String:
case CodeConstants.CONSTANT_MethodType:
pool.add(new PrimitiveConstant(tag, in.readUnsignedShort()));
nextPass[0].set(i);
break;
case CodeConstants.CONSTANT_NameAndType:
pool.add(new LinkConstant(tag, in.readUnsignedShort(), in.readUnsignedShort()));
nextPass[0].set(i);
break;
case CodeConstants.CONSTANT_Fieldref:
case CodeConstants.CONSTANT_Methodref:
case CodeConstants.CONSTANT_InterfaceMethodref:
case CodeConstants.CONSTANT_InvokeDynamic:
pool.add(new LinkConstant(tag, in.readUnsignedShort(), in.readUnsignedShort()));
nextPass[1].set(i);
break;
case CodeConstants.CONSTANT_MethodHandle:
pool.add(new LinkConstant(tag, in.readUnsignedByte(), in.readUnsignedShort()));
nextPass[2].set(i);
break;
}
}
// resolving complex pool elements
for (BitSet pass : nextPass) {
int idx = 0;
while ((idx = pass.nextSetBit(idx + 1)) > 0) {
pool.get(idx).resolveConstant(this);
}
}
// get global constant pool interceptor instance, if any available
interceptor = DecompilerContext.getPoolInterceptor();
}
public static void skipPool(DataInputFullStream in) throws IOException {
int size = in.readUnsignedShort();
for (int i = 1; i < size; i++) {
switch (in.readUnsignedByte()) {
case CodeConstants.CONSTANT_Utf8:
in.readUTF();
break;
case CodeConstants.CONSTANT_Integer:
case CodeConstants.CONSTANT_Float:
case CodeConstants.CONSTANT_Fieldref:
case CodeConstants.CONSTANT_Methodref:
case CodeConstants.CONSTANT_InterfaceMethodref:
case CodeConstants.CONSTANT_NameAndType:
case CodeConstants.CONSTANT_InvokeDynamic:
in.discard(4);
break;
case CodeConstants.CONSTANT_Long:
case CodeConstants.CONSTANT_Double:
in.discard(8);
i++;
break;
case CodeConstants.CONSTANT_Class:
case CodeConstants.CONSTANT_String:
case CodeConstants.CONSTANT_MethodType:
in.discard(2);
break;
case CodeConstants.CONSTANT_MethodHandle:
in.discard(3);
}
}
}
public int size() {
return pool.size();
}
public String[] getClassElement(int elementType, String className, int nameIndex, int descriptorIndex) {
String elementName = ((PrimitiveConstant)getConstant(nameIndex)).getString();
String descriptor = ((PrimitiveConstant)getConstant(descriptorIndex)).getString();
if (interceptor != null) {
String oldClassName = interceptor.getOldName(className);
if (oldClassName != null) {
className = oldClassName;
}
String newElement = interceptor.getName(className + ' ' + elementName + ' ' + descriptor);
if (newElement != null) {
elementName = newElement.split(" ")[1];
}
String newDescriptor = buildNewDescriptor(elementType == FIELD, descriptor);
if (newDescriptor != null) {
descriptor = newDescriptor;
}
}
return new String[]{elementName, descriptor};
}
public PooledConstant getConstant(int index) {
return pool.get(index);
}
public PrimitiveConstant getPrimitiveConstant(int index) {
PrimitiveConstant cn = (PrimitiveConstant)getConstant(index);
if (cn != null && interceptor != null) {
if (cn.type == CodeConstants.CONSTANT_Class) {
String newName = buildNewClassname(cn.getString());
if (newName != null) {
cn = new PrimitiveConstant(CodeConstants.CONSTANT_Class, newName);
}
}
}
return cn;
}
public LinkConstant getLinkConstant(int index) {
LinkConstant ln = (LinkConstant)getConstant(index);
if (ln != null && interceptor != null &&
(ln.type == CodeConstants.CONSTANT_Fieldref ||
ln.type == CodeConstants.CONSTANT_Methodref ||
ln.type == CodeConstants.CONSTANT_InterfaceMethodref)) {
String newClassName = buildNewClassname(ln.classname);
String newElement = interceptor.getName(ln.classname + ' ' + ln.elementname + ' ' + ln.descriptor);
String newDescriptor = buildNewDescriptor(ln.type == CodeConstants.CONSTANT_Fieldref, ln.descriptor);
//TODO: Fix newElement being null caused by ln.classname being a leaf class instead of the class that declared the field/method.
//See the comments of IDEA-137253 for more information.
if (newClassName != null || newElement != null || newDescriptor != null) {
String className = newClassName == null ? ln.classname : newClassName;
String elementName = newElement == null ? ln.elementname : newElement.split(" ")[1];
String descriptor = newDescriptor == null ? ln.descriptor : newDescriptor;
ln = new LinkConstant(ln.type, className, elementName, descriptor);
}
}
return ln;
}
@Override
public String buildNewClassname(String className) {
VarType vt = new VarType(className, true);
String newName = interceptor.getName(vt.value);
if (newName != null) {
StringBuilder buffer = new StringBuilder();
if (vt.arrayDim > 0) {
for (int i = 0; i < vt.arrayDim; i++) {
buffer.append('[');
}
buffer.append('L').append(newName).append(';');
}
else {
buffer.append(newName);
}
return buffer.toString();
}
return null;
}
private String buildNewDescriptor(boolean isField, String descriptor) {
if (isField) {
return FieldDescriptor.parseDescriptor(descriptor).buildNewDescriptor(this);
}
else {
return MethodDescriptor.parseDescriptor(descriptor).buildNewDescriptor(this);
}
}
}