soot.dava.toolkits.base.AST.transformations.DecrementIncrementStmtCreation Maven / Gradle / Ivy
package soot.dava.toolkits.base.AST.transformations;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 2005 Nomair A. Naeem
* %%
* 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.Value;
import soot.dava.internal.AST.ASTStatementSequenceNode;
import soot.dava.internal.asg.AugmentedStmt;
import soot.dava.internal.javaRep.DDecrementStmt;
import soot.dava.internal.javaRep.DIncrementStmt;
import soot.dava.toolkits.base.AST.analysis.DepthFirstAdapter;
import soot.jimple.AddExpr;
import soot.jimple.DefinitionStmt;
import soot.jimple.IntConstant;
import soot.jimple.Stmt;
import soot.jimple.SubExpr;
/*
* CHANGELOG: Nomair 9th Feb (For some reason only AddExpr was being checked for i++
* Added SubExpr for i--
*/
public class DecrementIncrementStmtCreation extends DepthFirstAdapter {
public DecrementIncrementStmtCreation() {
}
public DecrementIncrementStmtCreation(boolean verbose) {
super(verbose);
}
public void caseASTStatementSequenceNode(ASTStatementSequenceNode node) {
for (AugmentedStmt as : node.getStatements()) {
// System.out.println(temp);
Stmt s = as.get_Stmt();
if (!(s instanceof DefinitionStmt)) {
continue;
}
// check if its i= i+1
Value left = ((DefinitionStmt) s).getLeftOp();
Value right = ((DefinitionStmt) s).getRightOp();
if (right instanceof SubExpr) {
Value op1 = ((SubExpr) right).getOp1();
Value op2 = ((SubExpr) right).getOp2();
if (left.toString().compareTo(op1.toString()) != 0) {
// not the same
continue;
}
// if they are the same
// check if op2 is a constant with value 1 or -1
if (op2 instanceof IntConstant) {
if (((IntConstant) op2).value == 1) {
// this is i = i-1
DDecrementStmt newStmt = new DDecrementStmt(left, right);
as.set_Stmt(newStmt);
} else if (((IntConstant) op2).value == -1) {
// this is i = i+1
DIncrementStmt newStmt = new DIncrementStmt(left, right);
as.set_Stmt(newStmt);
}
}
} else if (right instanceof AddExpr) {
Value op1 = ((AddExpr) right).getOp1();
Value op2 = ((AddExpr) right).getOp2();
if (left.toString().compareTo(op1.toString()) != 0) {
continue;
}
// check if op2 is a constant with value 1 or -1
if (op2 instanceof IntConstant) {
if (((IntConstant) op2).value == 1) {
// this is i = i+1
DIncrementStmt newStmt = new DIncrementStmt(left, right);
as.set_Stmt(newStmt);
} else if (((IntConstant) op2).value == -1) {
// this is i = i-1
DDecrementStmt newStmt = new DDecrementStmt(left, right);
as.set_Stmt(newStmt);
}
}
} // right expr was addExpr
} // going through statements
}
}