/** For instance invokes */
public static ArrayList<SootMethod> resolveAppCall(Type tgtType, SootMethodRef methodRef) {
final NumberedString mSubsignature = methodRef.getSubSignature();
if (tgtType instanceof RefType) {
// find first class upwards in hierarchy, starting from cls, that implements method (i.e.,
// *concrete* method)
SootClass cls = ((RefType) tgtType).getSootClass();
while (!cls.declaresMethod(mSubsignature))
cls =
cls
.getSuperclass(); // if method not in this class, it HAS to be in a superclass, so a
// superclass must exist
if (!cls.hasTag(ClassTag.TAG_NAME)) return null; // not an app method
// finally, store resolved app method
SootMethod m = cls.getMethod(mSubsignature);
assert m.hasTag(MethodTag.TAG_NAME);
ArrayList<SootMethod> methods = new ArrayList<SootMethod>();
methods.add(m); // just one element, directly resolved
return methods;
}
if (tgtType instanceof AnySubType) {
// return set of all app subtypes that implement referenced method
SootClass baseCls = ((AnySubType) tgtType).getBase().getSootClass();
List subClasses =
baseCls.isInterface()
? Scene.v().getActiveHierarchy().getImplementersOf(baseCls)
: Scene.v().getActiveHierarchy().getSubclassesOf(baseCls);
ArrayList<SootMethod> methods = new ArrayList<SootMethod>();
for (Object oSubCls : subClasses) {
SootClass subCls = (SootClass) oSubCls;
if (subCls.hasTag(ClassTag.TAG_NAME)) {
try {
SootMethod m = subCls.getMethod(mSubsignature);
assert m.hasTag(MethodTag.TAG_NAME);
if (!m.isAbstract()) methods.add(m);
} catch (RuntimeException e) {
}
}
}
return methods;
}
assert tgtType instanceof ArrayType; // only other case observed so far
return new ArrayList(); // no array class/method is in app
}
/**
* Finds in class hierarchy and returns all app and lib concrete methods possibly referenced by
* method ref. Method is assumed to be virtual (not special or static). Returns true if there are
* library methods among targets found.
*/
public static boolean getConcreteCallTargets(
InvokeExpr instInvExpr, /*OUT*/
Set<SootMethod> appTargets, /*OUT*/
Set<SootMethod> libTargets) {
// get class of method ref; we start searching from this class
SootMethodRef mref = instInvExpr.getMethodRef();
SootClass cls = mref.declaringClass(); // starting class
final NumberedString subsignature = mref.getSubSignature(); // signature to search for
// CASE 1: object is of declared class type or inherited from some superclass
// find first superclass, starting from current cls, that declares method; there HAS to
// be such a class
// note that if cls is interface, superclass if java.lang.Object
// note that we don't check if there is indeed an interface declaring the method; we assume this
// is the case if no superclass declares it
while (!cls.declaresMethod(subsignature) && cls.hasSuperclass())
cls = cls.getSuperclass(); // never an interface
// now, method might not be in superclass, or might be abstract; in that case, it's not a target
SootMethod m;
if (cls.declaresMethod(subsignature)) {
m = cls.getMethod(subsignature);
if (!m.isAbstract()) {
if (cls.hasTag(ClassTag.TAG_NAME)) appTargets.add(m); // add app method
else libTargets.add(m); // add lib method
}
}
// (only for virtual/interface calls)
// CASE 2: object's actual type is a subclass; any subclass declaring the method is a possible
// target
// we have to check all superclasses of implementers, because starting cls might be
// interface
if (instInvExpr instanceof VirtualInvokeExpr || instInvExpr instanceof InterfaceInvokeExpr) {
cls = mref.declaringClass(); // start again from declaring class
List<SootClass> allSubclasses = getAllSubtypes(cls);
for (SootClass subCls : allSubclasses) {
m = getMethodInClassOrSuperclass(subCls, subsignature);
if (m != null && !m.isAbstract()) {
if (m.getDeclaringClass().hasTag(ClassTag.TAG_NAME)) appTargets.add(m); // add app method
else libTargets.add(m); // add lib method
}
}
}
return !libTargets.isEmpty();
}
