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A Java Optimization Framework
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package soot.dava.toolkits.base.AST.traversals;

/*-
 * #%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 java.util.HashMap;
import java.util.Stack;

import soot.Unit;
import soot.dava.internal.AST.ASTDoWhileNode;
import soot.dava.internal.AST.ASTForLoopNode;
import soot.dava.internal.AST.ASTIfElseNode;
import soot.dava.internal.AST.ASTIfNode;
import soot.dava.internal.AST.ASTLabeledBlockNode;
import soot.dava.internal.AST.ASTMethodNode;
import soot.dava.internal.AST.ASTNode;
import soot.dava.internal.AST.ASTStatementSequenceNode;
import soot.dava.internal.AST.ASTSwitchNode;
import soot.dava.internal.AST.ASTSynchronizedBlockNode;
import soot.dava.internal.AST.ASTTryNode;
import soot.dava.internal.AST.ASTUnconditionalLoopNode;
import soot.dava.internal.AST.ASTWhileNode;
import soot.dava.internal.javaRep.DVariableDeclarationStmt;
import soot.dava.toolkits.base.AST.analysis.DepthFirstAdapter;
import soot.jimple.DefinitionStmt;
import soot.jimple.InvokeStmt;
import soot.jimple.ReturnStmt;
import soot.jimple.Stmt;
import soot.jimple.ThrowStmt;

/*
 * This traversal class is responsible to gather information
 * regarding the different nodes and statements in the AST.
 * The class produces a HashMap between the node/statement given as
 * key and the parent of this construct (value)
 *
 * November 23rd, 2005. (Nomair) It is used for instance in the CopyPropagation algorithm
 * to be able to remove a particular copy
 * stmt for instance from its parent.
 */

public class ASTParentNodeFinder extends DepthFirstAdapter {

  HashMap parentOf;
  Stack parentStack;

  public ASTParentNodeFinder() {
    parentOf = new HashMap();
    parentStack = new Stack();
  }

  public ASTParentNodeFinder(boolean verbose) {
    super(verbose);
    parentOf = new HashMap();
    parentStack = new Stack();
  }

  public void inASTMethodNode(ASTMethodNode node) {
    parentOf.put(node, null);
    parentStack.push(node);
  }

  public void outASTMethodNode(ASTMethodNode node) {
    parentStack.pop();
  }

  public void inASTSynchronizedBlockNode(ASTSynchronizedBlockNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTSynchronizedBlockNode(ASTSynchronizedBlockNode node) {
    parentStack.pop();
  }

  public void inASTLabeledBlockNode(ASTLabeledBlockNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTLabeledBlockNode(ASTLabeledBlockNode node) {
    parentStack.pop();
  }

  public void inASTUnconditionalLoopNode(ASTUnconditionalLoopNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTUnconditionalLoopNode(ASTUnconditionalLoopNode node) {
    parentStack.pop();
  }

  public void inASTSwitchNode(ASTSwitchNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTSwitchNode(ASTSwitchNode node) {
    parentStack.pop();
  }

  public void inASTIfNode(ASTIfNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTIfNode(ASTIfNode node) {
    parentStack.pop();
  }

  public void inASTIfElseNode(ASTIfElseNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTIfElseNode(ASTIfElseNode node) {
    parentStack.pop();
  }

  public void inASTWhileNode(ASTWhileNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTWhileNode(ASTWhileNode node) {
    parentStack.pop();
  }

  public void inASTForLoopNode(ASTForLoopNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTForLoopNode(ASTForLoopNode node) {
    parentStack.pop();
  }

  public void inASTDoWhileNode(ASTDoWhileNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTDoWhileNode(ASTDoWhileNode node) {
    parentStack.pop();
  }

  public void inASTTryNode(ASTTryNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTTryNode(ASTTryNode node) {
    parentStack.pop();
  }

  public void inASTStatementSequenceNode(ASTStatementSequenceNode node) {
    parentOf.put(node, parentStack.peek());
    parentStack.push(node);
  }

  public void outASTStatementSequenceNode(ASTStatementSequenceNode node) {
    parentStack.pop();
  }

  public void inDefinitionStmt(DefinitionStmt s) {
    parentOf.put(s, parentStack.peek());
  }

  public void inReturnStmt(ReturnStmt s) {
    parentOf.put(s, parentStack.peek());
  }

  public void inInvokeStmt(InvokeStmt s) {
    parentOf.put(s, parentStack.peek());
  }

  public void inThrowStmt(ThrowStmt s) {
    parentOf.put(s, parentStack.peek());
  }

  public void inDVariableDeclarationStmt(DVariableDeclarationStmt s) {
    parentOf.put(s, parentStack.peek());
  }

  public void inStmt(Stmt s) {
    parentOf.put(s, parentStack.peek());
  }

  /*
   * This is the method which should be invoked by classes needing parent information. When the method is invoked with a
   * statement or node as input it returns the parent of that object. The parent can safely be casted to ASTNode as long as
   * the parent returned is non null
   */
  public Object getParentOf(Object statementOrNode) {
    return parentOf.get(statementOrNode);
  }
}