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/* Soot - a J*va Optimization Framework
* Copyright (C) 2000 Patrice Pominville
* Copyright (C) 2004 Ondrej Lhotak, Ganesh Sittampalam
*
* 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.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot;
import soot.IInitialResolver.Dependencies;
import soot.options.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.*;
/** Loads symbols for SootClasses from either class files or jimple files. */
public class SootResolver
{
/** Maps each resolved class to a list of all references in it. */
private final Map classToTypesSignature = new HashMap();
/** Maps each resolved class to a list of all references in it. */
private final Map classToTypesHierarchy = new HashMap();
/** SootClasses waiting to be resolved. */
private final LinkedList/*SootClass*/[] worklist = new LinkedList[4];
public SootResolver (Singletons.Global g) {
worklist[SootClass.HIERARCHY] = new LinkedList();
worklist[SootClass.SIGNATURES] = new LinkedList();
worklist[SootClass.BODIES] = new LinkedList();
}
public static SootResolver v() { return G.v().soot_SootResolver();}
/** Returns true if we are resolving all class refs recursively. */
private boolean resolveEverything() {
return( Options.v().whole_program() || Options.v().whole_shimple()
|| Options.v().full_resolver()
|| Options.v().output_format() == Options.output_format_dava );
}
/** Returns a (possibly not yet resolved) SootClass to be used in references
* to a class. If/when the class is resolved, it will be resolved into this
* SootClass.
* */
public SootClass makeClassRef(String className)
{
if(Scene.v().containsClass(className))
return Scene.v().getSootClass(className);
SootClass newClass;
newClass = new SootClass(className);
newClass.setResolvingLevel(SootClass.DANGLING);
Scene.v().addClass(newClass);
return newClass;
}
/**
* Resolves the given class. Depending on the resolver settings, may
* decide to resolve other classes as well. If the class has already
* been resolved, just returns the class that was already resolved.
* */
public SootClass resolveClass(String className, int desiredLevel) {
SootClass resolvedClass = makeClassRef(className);
addToResolveWorklist(resolvedClass, desiredLevel);
processResolveWorklist();
return resolvedClass;
}
/** Resolve all classes on toResolveWorklist. */
private void processResolveWorklist() {
for( int i = SootClass.BODIES; i >= SootClass.HIERARCHY; i-- ) {
while( !worklist[i].isEmpty() ) {
SootClass sc = (SootClass) worklist[i].removeFirst();
if( resolveEverything() ) {
if( sc.isPhantom() ) bringToSignatures(sc);
else bringToBodies(sc);
} else {
switch(i) {
case SootClass.BODIES: bringToBodies(sc); break;
case SootClass.SIGNATURES: bringToSignatures(sc); break;
case SootClass.HIERARCHY: bringToHierarchy(sc); break;
}
}
}
}
}
private void addToResolveWorklist(Type type, int level) {
if( type instanceof RefType )
addToResolveWorklist(((RefType) type).getClassName(), level);
else if( type instanceof ArrayType )
addToResolveWorklist(((ArrayType) type).baseType, level);
}
private void addToResolveWorklist(String className, int level) {
addToResolveWorklist(makeClassRef(className), level);
}
private void addToResolveWorklist(SootClass sc, int desiredLevel) {
if( sc.resolvingLevel() >= desiredLevel ) return;
worklist[desiredLevel].add(sc);
}
/** Hierarchy - we know the hierarchy of the class and that's it
* requires at least Hierarchy for all supertypes and enclosing types.
* */
private void bringToHierarchy(SootClass sc) {
if(sc.resolvingLevel() >= SootClass.HIERARCHY ) return;
if(Options.v().debug_resolver())
G.v().out.println("bringing to HIERARCHY: "+sc);
sc.setResolvingLevel(SootClass.HIERARCHY);
String className = sc.getName();
ClassSource is = SourceLocator.v().getClassSource(className);
if( is == null ) {
if(!Scene.v().allowsPhantomRefs()) {
String suffix="";
if(className.equals("java.lang.Object")) {
suffix = " Try adding rt.jar to Soot's classpath, e.g.:\n" +
"java -cp sootclasses.jar soot.Main -cp " +
".:/path/to/jdk/jre/lib/rt.jar ";
} else if(className.equals("javax.crypto.Cipher")) {
suffix = " Try adding jce.jar to Soot's classpath, e.g.:\n" +
"java -cp sootclasses.jar soot.Main -cp " +
".:/path/to/jdk/jre/lib/rt.jar:/path/to/jdk/jre/lib/jce.jar ";
}
throw new RuntimeException("couldn't find class: " +
className + " (is your soot-class-path set properly?)"+suffix);
} else {
G.v().out.println(
"Warning: " + className + " is a phantom class!");
sc.setPhantomClass();
classToTypesSignature.put( sc, new ArrayList() );
classToTypesHierarchy.put( sc, new ArrayList() );
}
} else {
Dependencies dependencies = is.resolve(sc);
classToTypesSignature.put( sc, new ArrayList(dependencies.typesToSignature) );
classToTypesHierarchy.put( sc, new ArrayList(dependencies.typesToHierarchy) );
}
reResolveHierarchy(sc);
}
public void reResolveHierarchy(SootClass sc) {
// Bring superclasses to hierarchy
if(sc.hasSuperclass())
addToResolveWorklist(sc.getSuperclass(), SootClass.HIERARCHY);
if(sc.hasOuterClass())
addToResolveWorklist(sc.getOuterClass(), SootClass.HIERARCHY);
for( Iterator ifaceIt = sc.getInterfaces().iterator(); ifaceIt.hasNext(); ) {
final SootClass iface = (SootClass) ifaceIt.next();
addToResolveWorklist(iface, SootClass.HIERARCHY);
}
}
/** Signatures - we know the signatures of all methods and fields
* requires at least Hierarchy for all referred to types in these signatures.
* */
private void bringToSignatures(SootClass sc) {
if(sc.resolvingLevel() >= SootClass.SIGNATURES ) return;
bringToHierarchy(sc);
if(Options.v().debug_resolver())
G.v().out.println("bringing to SIGNATURES: "+sc);
sc.setResolvingLevel(SootClass.SIGNATURES);
for( Iterator fIt = sc.getFields().iterator(); fIt.hasNext(); ) {
final SootField f = (SootField) fIt.next();
addToResolveWorklist( f.getType(), SootClass.HIERARCHY );
}
for( Iterator mIt = sc.getMethods().iterator(); mIt.hasNext(); ) {
final SootMethod m = (SootMethod) mIt.next();
addToResolveWorklist( m.getReturnType(), SootClass.HIERARCHY );
for( Iterator ptypeIt = m.getParameterTypes().iterator(); ptypeIt.hasNext(); ) {
final Type ptype = (Type) ptypeIt.next();
addToResolveWorklist( ptype, SootClass.HIERARCHY );
}
for (SootClass exception : m.getExceptions()) {
addToResolveWorklist( exception, SootClass.HIERARCHY );
}
}
// Bring superclasses to signatures
if(sc.hasSuperclass())
addToResolveWorklist(sc.getSuperclass(), SootClass.SIGNATURES);
for( Iterator ifaceIt = sc.getInterfaces().iterator(); ifaceIt.hasNext(); ) {
final SootClass iface = (SootClass) ifaceIt.next();
addToResolveWorklist(iface, SootClass.SIGNATURES);
}
}
/** Bodies - we can now start loading the bodies of methods
* for all referred to methods and fields in the bodies, requires
* signatures for the method receiver and field container, and
* hierarchy for all other classes referenced in method references.
* Current implementation does not distinguish between the receiver
* and other references. Therefore, it is conservative and brings all
* of them to signatures. But this could/should be improved.
* */
private void bringToBodies(SootClass sc) {
if(sc.resolvingLevel() >= SootClass.BODIES ) return;
bringToSignatures(sc);
if(Options.v().debug_resolver())
G.v().out.println("bringing to BODIES: "+sc);
sc.setResolvingLevel(SootClass.BODIES);
{
Collection references = classToTypesHierarchy.get(sc);
if( references == null ) return;
Iterator it = references.iterator();
while( it.hasNext() ) {
final Object o = it.next();
if( o instanceof String ) {
addToResolveWorklist((String) o, SootClass.HIERARCHY);
} else if( o instanceof Type ) {
addToResolveWorklist((Type) o, SootClass.HIERARCHY);
} else throw new RuntimeException(o.toString());
}
}
{
Collection references = classToTypesSignature.get(sc);
if( references == null ) return;
Iterator it = references.iterator();
while( it.hasNext() ) {
final Object o = it.next();
if( o instanceof String ) {
addToResolveWorklist((String) o, SootClass.SIGNATURES);
} else if( o instanceof Type ) {
addToResolveWorklist((Type) o, SootClass.SIGNATURES);
} else throw new RuntimeException(o.toString());
}
}
}
public void reResolve(SootClass cl) {
int resolvingLevel = cl.resolvingLevel();
if( resolvingLevel < SootClass.HIERARCHY ) return;
reResolveHierarchy(cl);
cl.setResolvingLevel(SootClass.HIERARCHY);
addToResolveWorklist(cl, resolvingLevel);
processResolveWorklist();
}
}
