/*
* Copyright (c) 2008-2013, Matthias Mann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Matthias Mann nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
package co.paralleluniverse.fibers.instrument;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.TypeInsnNode;
import org.objectweb.asm.tree.analysis.AnalyzerException;
import org.objectweb.asm.tree.analysis.BasicInterpreter;
import org.objectweb.asm.tree.analysis.BasicValue;
/**
* An extension to {@link BasicInterpreter} which collects the type of
* objects and arrays.
*
* @author Matthias Mann
*/
class TypeInterpreter extends BasicInterpreter {
private final MethodDatabase db;
public TypeInterpreter(MethodDatabase db) {
this.db = db;
}
@Override
public BasicValue newValue(Type type) {
if(type == null) {
return BasicValue.UNINITIALIZED_VALUE;
}
if(type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY) {
return new BasicValue(type);
}
return super.newValue(type);
}
@Override
public BasicValue newOperation(AbstractInsnNode insn) throws AnalyzerException {
if(insn.getOpcode() == Opcodes.NEW) {
return new NewValue(Type.getObjectType(((TypeInsnNode) insn).desc), false, insn);
}
return super.newOperation(insn);
}
@Override
public BasicValue copyOperation(AbstractInsnNode insn, BasicValue value) throws AnalyzerException {
if(insn.getOpcode() == Opcodes.DUP) {
if(value instanceof NewValue) {
NewValue newValue = (NewValue)value;
if(!newValue.isDupped) {
return new NewValue(newValue.getType(), true, insn);
}
}
}
return super.copyOperation(insn, value);
}
@Override
public BasicValue binaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2) throws AnalyzerException {
if(insn.getOpcode() == Opcodes.AALOAD) {
Type t1 = value1.getType();
if(t1 == null || t1.getSort() != Type.ARRAY) {
throw new AnalyzerException(insn, "AALOAD needs an array as first parameter");
}
Type resultType = Type.getType(t1.getDescriptor().substring(1));
return new BasicValue(resultType);
}
return super.binaryOperation(insn, value1, value2);
}
@Override
public BasicValue merge(BasicValue v, BasicValue w) {
if (!v.equals(w)) {
if(v.isReference() && w.isReference()) {
int dimensions = 0;
Type typeV = v.getType();
Type typeW = w.getType();
if(typeV.getSort() != typeW.getSort()) {
db.log(LogLevel.DEBUG, "Array and none array type can't be merged: %s %s", v, w);
return BasicValue.UNINITIALIZED_VALUE;
}
if(typeW.getSort() == Type.ARRAY) {
dimensions = typeV.getDimensions();
if(dimensions != typeW.getDimensions()) {
db.log(LogLevel.DEBUG, "Arrays with different dimensions can't be merged: %s %s", v, w);
return BasicValue.UNINITIALIZED_VALUE;
}
typeV = typeV.getElementType();
typeW = typeW.getElementType();
if(typeV.getSort() != Type.OBJECT || typeW.getSort() != Type.OBJECT) {
db.log(LogLevel.DEBUG, "Arrays of different primitive type can't be merged: %s %s", v, w);
return BasicValue.UNINITIALIZED_VALUE;
}
}
String internalV = typeV.getInternalName();
String internalW = typeW.getInternalName();
if("null".equals(internalV)) {
return w;
}
if("null".equals(internalW)) {
return v;
}
String superClass = db.getCommonSuperClass(internalV, internalW);
if(superClass == null) {
if(db.isException(internalW)) {
db.log(LogLevel.WARNING, "Could not determine super class for v=%s w=%s - decided to use exception %s", v, w, w);
return w;
}
if(db.isException(internalV)) {
db.log(LogLevel.WARNING, "Could not determine super class for v=%s w=%s - decided to use exception %s", v, w, v);
return v;
}
db.log(LogLevel.WARNING, "Could not determine super class for v=%s w=%s - decided to use java/lang/Object", v, w);
superClass = "java/lang/Object";
}
String typeDescriptor = makeTypeDescriptor(superClass, dimensions);
db.log(LogLevel.INFO, "Common super class for v=%s w=%s is %s", v, w, typeDescriptor);
return new BasicValue(Type.getType(typeDescriptor));
}
return BasicValue.UNINITIALIZED_VALUE;
}
return v;
}
private static String makeTypeDescriptor(String className, int dimensions) {
int len = className.length();
char[] tmp = new char[len + 2 + dimensions];
for(int i=0 ; i<dimensions ; i++) {
tmp[i] = '[';
}
tmp[dimensions] = 'L';
className.getChars(0, len, tmp, dimensions+1);
tmp[dimensions+1+len] = ';';
return new String(tmp);
}
}