soot.dava.toolkits.base.AST.traversals.InitializationDeclarationShortcut Maven / Gradle / Ivy
package soot.dava.toolkits.base.AST.traversals;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 1997 - 2018 Raja Vallée-Rai and others
* %%
* 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 java.util.List;
import soot.Local;
import soot.Value;
import soot.dava.internal.AST.ASTMethodNode;
import soot.dava.internal.asg.AugmentedStmt;
import soot.dava.toolkits.base.AST.analysis.DepthFirstAdapter;
import soot.jimple.DefinitionStmt;
import soot.jimple.Stmt;
/*
* Given a statement of interest this traversal checks whether
* a, the defined variable is a local
* b, there is any def of the defined local of interest before
* the given statement
*
* if no then possible is set to true
* else false
*/
public class InitializationDeclarationShortcut extends DepthFirstAdapter {
AugmentedStmt ofInterest;
boolean possible = false;
Local definedLocal = null;
int seenBefore = 0;// if there is a definition of local which is not by stmt of interest increment this
public InitializationDeclarationShortcut(AugmentedStmt ofInterest) {
this.ofInterest = ofInterest;
}
public InitializationDeclarationShortcut(boolean verbose, AugmentedStmt ofInterest) {
super(verbose);
this.ofInterest = ofInterest;
}
public boolean isShortcutPossible() {
return possible;
}
/*
* Check that the stmt of interest defines a local in the DVariableDeclarationNode of the method else set to false and stop
*/
public void inASTMethodNode(ASTMethodNode node) {
Stmt s = ofInterest.get_Stmt();
// check this is a definition
if (!(s instanceof DefinitionStmt)) {
possible = false;
return;
}
Value defined = ((DefinitionStmt) s).getLeftOp();
if (!(defined instanceof Local)) {
possible = false;
return;
}
// check that this is a local defined in this method
// its a sanity check
List declaredLocals = node.getDeclaredLocals();
if (!declaredLocals.contains(defined)) {
possible = false;
return;
}
definedLocal = (Local) defined;
}
public void inDefinitionStmt(DefinitionStmt s) {
if (definedLocal == null) {
return;
}
Value defined = (s).getLeftOp();
if (!(defined instanceof Local)) {
return;
}
if (defined.equals(definedLocal)) {
// the local of interest is being defined
// if this is the augmentedStmt of interest set possible to true if not already seen
if (s.equals(ofInterest.get_Stmt())) {
// it is the stmt of interest
if (seenBefore == 0) {
possible = true;
} else {
possible = false;
}
} else {
// its a definition of the local of interest but not by the stmt of interest
seenBefore++;
}
}
}
}