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/*
* Copyright 2010 Henry Coles
*
* 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.pitest.mutationtest.engine.gregor.mutators;
import static org.objectweb.asm.Opcodes.DCONST_0;
import static org.objectweb.asm.Opcodes.FCONST_0;
import static org.objectweb.asm.Opcodes.ICONST_0;
import static org.objectweb.asm.Opcodes.INVOKESTATIC;
import static org.objectweb.asm.Opcodes.LCONST_0;
import static org.objectweb.asm.Opcodes.POP;
import static org.objectweb.asm.Opcodes.POP2;
import java.util.HashMap;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.pitest.functional.F2;
import org.pitest.mutationtest.engine.MutationIdentifier;
import org.pitest.mutationtest.engine.gregor.Context;
import org.pitest.mutationtest.engine.gregor.LineTrackingMethodAdapter;
import org.pitest.mutationtest.engine.gregor.MethodInfo;
import org.pitest.mutationtest.engine.gregor.MethodMutatorFactory;
enum MethodCallMutator implements MethodMutatorFactory {
METHOD_CALL_MUTATOR;
public MethodVisitor create(final Context context,
final MethodInfo methodInfo, final MethodVisitor methodVisitor) {
return new MethodCallMethodVisitor(methodInfo, context, methodVisitor,
this, allMethods());
}
private F2 allMethods() {
return new F2() {
public Boolean apply(final String a, final String b) {
return true;
}
};
}
public String getGloballyUniqueId() {
return this.getClass().getName();
}
}
class MethodCallMethodVisitor extends LineTrackingMethodAdapter {
private final static HashMap RETURN_TYPE_MAP = new HashMap();
private final F2 filter;
private final MethodMutatorFactory factory;
static {
RETURN_TYPE_MAP.put(Type.INT_TYPE, ICONST_0);
RETURN_TYPE_MAP.put(Type.BOOLEAN_TYPE, ICONST_0);
RETURN_TYPE_MAP.put(Type.BYTE_TYPE, ICONST_0);
RETURN_TYPE_MAP.put(Type.CHAR_TYPE, ICONST_0);
RETURN_TYPE_MAP.put(Type.SHORT_TYPE, ICONST_0);
RETURN_TYPE_MAP.put(Type.LONG_TYPE, LCONST_0);
RETURN_TYPE_MAP.put(Type.FLOAT_TYPE, FCONST_0);
RETURN_TYPE_MAP.put(Type.DOUBLE_TYPE, DCONST_0);
}
public MethodCallMethodVisitor(final MethodInfo methodInfo,
final Context context, final MethodVisitor writer,
final MethodMutatorFactory factory,
final F2 filter) {
super(methodInfo, context, writer);
this.factory = factory;
this.filter = filter;
}
@Override
public void visitMethodInsn(final int opcode, final String owner,
final String name, final String desc) {
if (!this.filter.apply(name, desc)
|| isCallToSuperOrOwnConstructor(name, owner)) {
this.mv.visitMethodInsn(opcode, owner, name, desc);
} else {
final MutationIdentifier newId = this.context.registerMutation(
this.factory, "removed call to " + owner + "::" + name);
if (this.context.shouldMutate(newId)) {
popStack(desc, name);
popThisIfNotStatic(opcode);
putReturnValueOnStack(desc, name);
} else {
this.mv.visitMethodInsn(opcode, owner, name, desc);
}
}
}
private boolean isCallToSuperOrOwnConstructor(final String name,
final String owner) {
return this.methodInfo.isConstructor()
&& MethodInfo.isConstructor(name)
&& (owner.equals(this.context.getClassInfo().getName()) || this.context
.getClassInfo().getSuperName().equals(owner));
}
private void popThisIfNotStatic(final int opcode) {
if (!isStatic(opcode)) {
this.mv.visitInsn(POP);
}
}
private void popStack(final String desc, final String name) {
final Type[] argTypes = Type.getArgumentTypes(desc);
for (int i = argTypes.length - 1; i >= 0; i--) {
final Type argumentType = argTypes[i];
if (argumentType.getSize() != 1) {
this.mv.visitInsn(POP2);
} else {
this.mv.visitInsn(POP);
}
}
if (MethodInfo.isConstructor(name)) {
this.mv.visitInsn(POP);
}
}
private static boolean isStatic(final int opcode) {
return INVOKESTATIC == opcode;
}
private void putReturnValueOnStack(final String desc, final String name) {
final Type returnType = Type.getReturnType(desc);
if (!returnType.equals(Type.VOID_TYPE)) {
final Integer opCode = RETURN_TYPE_MAP.get(returnType);
if (opCode == null) {
this.mv.visitInsn(Opcodes.ACONST_NULL);
} else {
this.mv.visitInsn(opCode);
}
} else if (MethodInfo.isConstructor(name)) {
this.mv.visitInsn(Opcodes.ACONST_NULL);
}
}
}