soot.jimple.spark.internal.SparkLibraryHelper Maven / Gradle / Ivy
package soot.jimple.spark.internal;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 2002 Ondrej Lhotak
* %%
* This program 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 2.1 of the
* License, or (at your option) any later version.
*
* This program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
import soot.AnySubType;
import soot.ArrayType;
import soot.RefType;
import soot.SootMethod;
import soot.Type;
import soot.TypeSwitch;
import soot.jimple.spark.pag.AllocNode;
import soot.jimple.spark.pag.ArrayElement;
import soot.jimple.spark.pag.FieldRefNode;
import soot.jimple.spark.pag.LocalVarNode;
import soot.jimple.spark.pag.Node;
import soot.jimple.spark.pag.PAG;
import soot.jimple.spark.pag.VarNode;
/**
* This {@link TypeSwitch} can be used to add library behavior to the PAG. It adds allocation nodes with {@link AnySubType}
* of the declared type to the target node.
*
* @author Florian Kuebler
*
*/
public class SparkLibraryHelper extends TypeSwitch {
private PAG pag;
private Node node;
private SootMethod method;
/**
* The constructor for this {@link TypeSwitch}.
*
* @param pag
* the pointer assignment graph in that the new edges and nodes should be added into.
* @param node
* the node of the value for which allocations should be made.
* @param method
* the method in which the allocations should take place. This parameter can be null.
*/
public SparkLibraryHelper(PAG pag, Node node, SootMethod method) {
this.pag = pag;
this.node = node;
this.method = method;
}
/**
* A new local will be created and connected to {@link SparkLibraryHelper#node} of type {@link RefType}. For this new local
* an allocation edge to {@link AnySubType} of its declared type will be added.
*/
@Override
public void caseRefType(RefType t) {
// var tmp;
VarNode local = pag.makeLocalVarNode(new Object(), t, method);
// new T();
AllocNode alloc = pag.makeAllocNode(new Object(), AnySubType.v(t), method);
// tmp = new T();
pag.addAllocEdge(alloc, local);
// x = tmp;
pag.addEdge(local, node);
}
/**
* A new local array will be created and connected to {@link SparkLibraryHelper#node} of type {@link ArrayType}. For this
* new local an allocation edge to a new array of its declared type will be added. If the
* {@link ArrayType#getElementType()} is still an array an allocation to a new array of this element type will be made and
* stored until the element type is a {@link RefType}. If this is the case an allocation to {@link AnySubType} of
* {@link ArrayType#baseType} will be made.
*/
@Override
public void caseArrayType(ArrayType type) {
Node array = node;
for (Type t = type; t instanceof ArrayType; t = ((ArrayType) t).getElementType()) {
ArrayType at = (ArrayType) t;
if (at.baseType instanceof RefType) {
// var tmpArray;
LocalVarNode localArray = pag.makeLocalVarNode(new Object(), t, method);
// x = tmpArray;
pag.addEdge(localArray, array);
// new T[]
AllocNode newArray = pag.makeAllocNode(new Object(), at, method);
// tmpArray = new T[]
pag.addEdge(newArray, localArray);
// tmpArray[i]
FieldRefNode arrayRef = pag.makeFieldRefNode(localArray, ArrayElement.v());
// var tmp
LocalVarNode local = pag.makeLocalVarNode(new Object(), at.getElementType(), method);
// tmpArray[i] = tmp
pag.addEdge(local, arrayRef);
// x = tmp
array = local;
if (at.numDimensions == 1) {
// new T()
AllocNode alloc = pag.makeAllocNode(new Object(), AnySubType.v((RefType) at.baseType), method);
// tmp = new T()
pag.addEdge(alloc, local);
}
}
}
}
}