/**
* Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
*/
/**
*
*/
package org.evosuite.instrumentation.mutation;
import java.util.LinkedList;
import java.util.List;
import org.evosuite.coverage.mutation.Mutation;
import org.evosuite.coverage.mutation.MutationPool;
import org.evosuite.graphs.cfg.BytecodeInstruction;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;
import org.objectweb.asm.tree.AbstractInsnNode;
import org.objectweb.asm.tree.FieldInsnNode;
import org.objectweb.asm.tree.InsnList;
import org.objectweb.asm.tree.InsnNode;
import org.objectweb.asm.tree.LabelNode;
import org.objectweb.asm.tree.LdcInsnNode;
import org.objectweb.asm.tree.MethodNode;
import org.objectweb.asm.tree.analysis.Frame;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* <p>
* DeleteField class.
* </p>
*
* @author fraser
*/
public class DeleteField implements MutationOperator {
private static Logger logger = LoggerFactory.getLogger(DeleteField.class);
public static final String NAME = "DeleteField";
/* (non-Javadoc)
* @see org.evosuite.cfg.instrumentation.mutation.MutationOperator#apply(org.objectweb.asm.tree.MethodNode, java.lang.String, java.lang.String, org.evosuite.cfg.BytecodeInstruction)
*/
/** {@inheritDoc} */
@Override
public List<Mutation> apply(MethodNode mn, String className, String methodName,
BytecodeInstruction instruction, Frame frame) {
List<Mutation> mutations = new LinkedList<Mutation>();
FieldInsnNode node = (FieldInsnNode) instruction.getASMNode();
Type fieldType = Type.getType(node.desc);
// insert mutation into bytecode with conditional
InsnList mutation = new InsnList();
logger.debug("Mutation deletefield for statement " + node.name + node.desc);
if (node.getOpcode() == Opcodes.GETFIELD) {
logger.debug("Deleting source of type " + node.owner);
mutation.add(new InsnNode(Opcodes.POP));
}
mutation.add(getDefault(fieldType));
// insert mutation into pool
Mutation mutationObject = MutationPool.addMutation(className,
methodName,
NAME + " " + node.name
+ node.desc,
instruction,
mutation,
getInfectionDistance(node,
mutation));
mutations.add(mutationObject);
return mutations;
}
private static AbstractInsnNode getDefault(Type type) {
if (type.equals(Type.BOOLEAN_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.INT_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.BYTE_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.CHAR_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.DOUBLE_TYPE)) {
return new LdcInsnNode(0.0);
} else if (type.equals(Type.FLOAT_TYPE)) {
return new LdcInsnNode(0.0F);
} else if (type.equals(Type.INT_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.LONG_TYPE)) {
return new LdcInsnNode(0L);
} else if (type.equals(Type.SHORT_TYPE)) {
return new LdcInsnNode(0);
} else if (type.equals(Type.VOID_TYPE)) {
return new LabelNode();
} else {
return new InsnNode(Opcodes.ACONST_NULL);
}
}
/**
* <p>
* getInfectionDistance
* </p>
*
* @param original
* a {@link org.objectweb.asm.tree.FieldInsnNode} object.
* @param mutant
* a {@link org.objectweb.asm.tree.InsnList} object.
* @return a {@link org.objectweb.asm.tree.InsnList} object.
*/
public InsnList getInfectionDistance(FieldInsnNode original, InsnList mutant) {
InsnList distance = new InsnList();
if (original.getOpcode() == Opcodes.GETFIELD)
distance.add(new InsnNode(Opcodes.DUP)); //make sure to re-load this for GETFIELD
distance.add(new FieldInsnNode(original.getOpcode(), original.owner,
original.name, original.desc));
Type type = Type.getType(original.desc);
if (type.getDescriptor().startsWith("L") || type.getDescriptor().startsWith("[")) {
ReplaceVariable.addReferenceDistanceCheck(distance, type, mutant);
} else {
ReplaceVariable.addPrimitiveDistanceCheck(distance, type, mutant);
}
return distance;
}
/**
* <p>
* getDistance
* </p>
*
* @param val1
* a double.
* @param val2
* a double.
* @return a double.
*/
public static double getDistance(double val1, double val2) {
return val1 == val2 ? 1.0 : 0.0;
}
/**
* <p>
* getDistance
* </p>
*
* @param obj1
* a {@link java.lang.Object} object.
* @param obj2
* a {@link java.lang.Object} object.
* @return a double.
*/
public static double getDistance(Object obj1, Object obj2) {
if (obj1 == null) {
return obj2 == null ? 1.0 : 0.0;
} else {
return obj1.equals(obj2) ? 1.0 : 0.0;
}
}
/* (non-Javadoc)
* @see org.evosuite.cfg.instrumentation.mutation.MutationOperator#isApplicable(org.evosuite.cfg.BytecodeInstruction)
*/
/** {@inheritDoc} */
@Override
public boolean isApplicable(BytecodeInstruction instruction) {
return instruction.getASMNode().getOpcode() == Opcodes.GETFIELD
|| instruction.getASMNode().getOpcode() == Opcodes.GETSTATIC;
}
}