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RoboVM fork of Soot - A Java optimization framework
/* Soot - a J*va Optimization Framework
* Copyright (C) 2005 Antoine Mine
*
* This library 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 library 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 General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* Implementation of the paper "A Combined Pointer and Purity Analysis for
* Java Programs" by Alexandru Salcianu and Martin Rinard, within the
* Soot Optimization Framework.
*
* by Antoine Mine, 2005/01/24
*/
package soot.jimple.toolkits.annotation.purity;
import java.util.*;
import soot.*;
import soot.util.*;
import soot.jimple.toolkits.callgraph.*;
import soot.toolkits.graph.*;
/**
* Builds a DirectedGraph from a CallGraph and SootMethodFilter.
*
* This is used in AbstractInterproceduralAnalysis to construct a reverse
* pseudo topological order on which to iterate.
* You can specify a SootMethodFilter to trim the graph by cutting
* call edges strarting
*
* Methods filtered-out by the SootMethodFilter will not appear in the
* DirectedGraph!
*/
public class DirectedCallGraph implements DirectedGraph {
protected Set nodes;
protected Map succ;
protected Map pred;
protected List heads;
protected List tails;
protected int size;
/**
* The constructor does all the work here.
* After constructed, you can safely use all interface methods.
* Moreover, these methods should perform very fastly...
*
* The DirectedGraph will only contain methods in call paths from a method
* in head and comprising only methods wanted by filter.
* Moreover, only concrete methods are put in the graph...
*
* @param heads is a List of SootMethod
*/
public DirectedCallGraph(CallGraph cg,
SootMethodFilter filter,
Iterator heads,
boolean verbose)
{
// filter heads by filter
List filteredHeads = new LinkedList();
while (heads.hasNext()) {
SootMethod m = (SootMethod) heads.next();
if (m.isConcrete() && filter.want(m)) filteredHeads.add(m);
}
this.nodes = new HashSet(filteredHeads);
MultiMap s = new HashMultiMap();
MultiMap p = new HashMultiMap();
// simple breadth-first visit
Set remain = new HashSet(filteredHeads);
int nb = 0;
if (verbose) G.v().out.println("[AM] dumping method dependencies");
while (!remain.isEmpty()) {
Set newRemain = new HashSet();
Iterator it = remain.iterator();
while (it.hasNext()) {
SootMethod m = (SootMethod)it.next();
Iterator itt = cg.edgesOutOf(m);
if (verbose)
G.v().out.println(" |- "+m.toString()+" calls");
while (itt.hasNext()) {
Edge edge = (Edge)itt.next();
SootMethod mm = edge.tgt();
boolean keep = mm.isConcrete() && filter.want(mm);
if (verbose)
G.v().out.println(" | |- "+mm.toString()+
(keep?"":" (filtered out)"));
if (keep) {
if (this.nodes.add(mm)) newRemain.add(mm);
s.put(m,mm);
p.put(mm,m);
}
}
nb++;
}
remain = newRemain;
}
G.v().out.println("[AM] number of methods to be analysed: "+nb);
// MultiMap -> Map of List
this.succ = new HashMap();
this.pred = new HashMap();
this.tails = new LinkedList();
this.heads = new LinkedList();
Iterator it = this.nodes.iterator();
while (it.hasNext()) {
Object x = it.next();
Set ss = s.get(x);
Set pp = p.get(x);
this.succ.put(x, new LinkedList(ss));
this.pred.put(x, new LinkedList(pp));
if (ss.isEmpty()) this.tails.add(x);
if (pp.isEmpty()) this.heads.add(x);
}
this.size = this.nodes.size();
}
/** You get a List of SootMethod. */
public List getHeads() { return heads; }
/** You get a List of SootMethod. */
public List getTails() { return tails; }
/** You get an Iterator on SootMethod. */
public Iterator iterator() { return nodes.iterator(); }
public int size() { return size; }
/** You get a List of SootMethod. */
public List getSuccsOf(Object s) { return succ.get(s); }
/** You get a List of SootMethod. */
public List getPredsOf(Object s) { return pred.get(s); }
}