/**
* 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();
}
private SootMethodRef remapRef(SootMethodRef ref) {
Type return_type = fixType(ref.returnType());
List params = fixParameterList(ref.parameterTypes());
int modifiers = Modifier.PUBLIC;
if (ref.isStatic()) {
modifiers += Modifier.STATIC;
}
SootMethod method = new SootMethod(ref.name(), params, return_type, modifiers);
SootClass decl_class = ref.declaringClass();
if (shouldMap(decl_class)) {
decl_class = getMapping(decl_class);
}
method.setDeclaringClass(decl_class);
return method.makeRef();
}
public void outAStaticInvokeExpr(AStaticInvokeExpr node) {
List args;
if (node.getArgList() != null) args = (List) mProductions.removeLast();
else args = new ArrayList();
SootMethodRef method = (SootMethodRef) mProductions.removeLast();
method =
Scene.v()
.makeMethodRef(
method.declaringClass(),
method.name(),
method.parameterTypes(),
method.returnType(),
true);
mProductions.addLast(Jimple.v().newStaticInvokeExpr(method, args));
}
private Value mutate(Value value) {
if (value instanceof FieldRef) {
FieldRef ref = (FieldRef) value;
SootField field = ref.getField();
Type type = field.getType();
if (type instanceof RefType) {
RefType ref_type = (RefType) type;
SootClass soot_class = ref_type.getSootClass();
if (shouldMap(soot_class)) {
addField(field, ref);
}
} else if (type instanceof ArrayType) {
ArrayType array_type = (ArrayType) type;
Type base_type = array_type.baseType;
if (base_type instanceof RefType) {
RefType ref_type = (RefType) base_type;
SootClass soot_class = ref_type.getSootClass();
if (shouldMap(soot_class)) {
addField(field, ref);
}
}
}
SootClass soot_class = field.getDeclaringClass();
if (shouldMap(soot_class)) {
addField(field, ref);
}
return value;
} else if (value instanceof InvokeExpr) {
InvokeExpr expr = (InvokeExpr) value;
SootMethodRef ref = expr.getMethodRef();
SootClass soot_class = ref.declaringClass();
final NumberedString subSignature = ref.getSubSignature();
if (shouldMap(soot_class)) {
SootClass new_class = getMapping(soot_class);
if (new_class.declaresMethod(subSignature)) {
SootMethod new_method = RootbeerScene.v().getMethod(new_class, subSignature.getString());
addAddedMethod(new_method);
fixArguments(new_method);
RootbeerScene.v().getDfsInfo().addReachableMethodSig(new_method.getSignature());
expr.setMethodRef(new_method.makeRef());
}
} else {
if (soot_class.declaresMethod(ref.getSubSignature())) {
SootMethod method = soot_class.getMethod(ref.getSubSignature());
fixArguments(method);
}
}
ref = remapRef(ref);
try {
if (shouldMap(soot_class)) {
soot_class = getMapping(soot_class);
}
SootMethod method = soot_class.getMethod(ref.getSubSignature());
RootbeerScene.v().getDfsInfo().addReachableMethodSig(method.getSignature());
expr.setMethodRef(method.makeRef());
} catch (Exception ex) {
// ex.printStackTrace();
}
return value;
} else if (value instanceof NewExpr) {
NewExpr expr = (NewExpr) value;
RefType base_type = expr.getBaseType();
SootClass soot_class = base_type.getSootClass();
if (shouldMap(soot_class)) {
SootClass new_class = getMapping(soot_class);
expr.setBaseType(new_class.getType());
}
return value;
} else if (value instanceof NewArrayExpr) {
NewArrayExpr expr = (NewArrayExpr) value;
Type base_type = expr.getBaseType();
base_type = fixType(base_type);
expr.setBaseType(base_type);
return value;
} else if (value instanceof NewMultiArrayExpr) {
NewMultiArrayExpr expr = (NewMultiArrayExpr) value;
ArrayType array_type = expr.getBaseType();
Type base_type = array_type.baseType;
if (base_type instanceof RefType) {
RefType ref_type = (RefType) base_type;
SootClass soot_class = ref_type.getSootClass();
if (shouldMap(soot_class)) {
SootClass new_class = getMapping(soot_class);
ArrayType new_type = ArrayType.v(new_class.getType(), array_type.numDimensions);
expr.setBaseType(new_type);
}
}
return value;
} else if (value instanceof CastExpr) {
CastExpr expr = (CastExpr) value;
Type cast_type = expr.getCastType();
cast_type = fixType(cast_type);
expr.setCastType(cast_type);
return value;
} else if (value instanceof ParameterRef) {
ParameterRef ref = (ParameterRef) value;
Type new_type = fixType(ref.getType());
return new ParameterRef(new_type, ref.getIndex());
} else if (value instanceof ThisRef) {
ThisRef ref = (ThisRef) value;
Type new_type = fixType(ref.getType());
return new ThisRef((RefType) new_type);
} else if (value instanceof Local) {
Local local = (Local) value;
Type type = local.getType();
local.setType(fixType(type));
return value;
} else {
return value;
}
}