/**
* Resolve possible instance method call targets.
*
* @param receiverType type of the receiver object
* @param invokeInstruction the InvokeInstruction
* @param cpg the ConstantPoolGen
* @param receiverTypeIsExact if true, the receiver type is known exactly, which should allow a
* precise result
* @return Set of methods which might be called
* @throws ClassNotFoundException
*/
public static Set<JavaClassAndMethod> resolveMethodCallTargets(
ReferenceType receiverType,
InvokeInstruction invokeInstruction,
ConstantPoolGen cpg,
boolean receiverTypeIsExact)
throws ClassNotFoundException {
HashSet<JavaClassAndMethod> result = new HashSet<JavaClassAndMethod>();
if (invokeInstruction.getOpcode() == Constants.INVOKESTATIC)
throw new IllegalArgumentException();
String methodName = invokeInstruction.getName(cpg);
String methodSig = invokeInstruction.getSignature(cpg);
// Array method calls aren't virtual.
// They should just resolve to Object methods.
if (receiverType instanceof ArrayType) {
JavaClass javaLangObject =
AnalysisContext.currentAnalysisContext().lookupClass("java.lang.Object");
JavaClassAndMethod classAndMethod =
findMethod(javaLangObject, methodName, methodSig, INSTANCE_METHOD);
if (classAndMethod != null) result.add(classAndMethod);
return result;
}
if (receiverType instanceof NullType) {
return Collections.<JavaClassAndMethod>emptySet();
}
AnalysisContext analysisContext = AnalysisContext.currentAnalysisContext();
// Get the receiver class.
String receiverClassName = ((ObjectType) receiverType).getClassName();
JavaClass receiverClass = analysisContext.lookupClass(receiverClassName);
ClassDescriptor receiverDesc =
DescriptorFactory.createClassDescriptorFromDottedClassName(receiverClassName);
// Figure out the upper bound for the method.
// This is what will be called if this is not a virtual call site.
JavaClassAndMethod upperBound =
findMethod(receiverClass, methodName, methodSig, CONCRETE_METHOD);
if (upperBound == null) {
upperBound =
findInvocationLeastUpperBound(
receiverClass, methodName, methodSig, CONCRETE_METHOD, false);
}
if (upperBound != null) {
if (DEBUG_METHOD_LOOKUP) {
System.out.println(
"Adding upper bound: "
+ SignatureConverter.convertMethodSignature(
upperBound.getJavaClass(), upperBound.getMethod()));
}
result.add(upperBound);
}
// Is this a virtual call site?
boolean virtualCall =
(invokeInstruction.getOpcode() == Constants.INVOKEVIRTUAL
|| invokeInstruction.getOpcode() == Constants.INVOKEINTERFACE)
&& (upperBound == null
|| !upperBound.getJavaClass().isFinal() && !upperBound.getMethod().isFinal())
&& !receiverTypeIsExact;
if (virtualCall) {
if (!receiverClassName.equals("java.lang.Object")) {
// This is a true virtual call: assume that any concrete
// subtype method may be called.
Set<ClassDescriptor> subTypeSet = analysisContext.getSubtypes2().getSubtypes(receiverDesc);
for (ClassDescriptor subtype : subTypeSet) {
XMethod concreteSubtypeMethod = findMethod(subtype, methodName, methodSig, false);
if (concreteSubtypeMethod != null
&& (concreteSubtypeMethod.getAccessFlags() & Constants.ACC_ABSTRACT) == 0) {
result.add(new JavaClassAndMethod(concreteSubtypeMethod));
}
}
if (false && subTypeSet.size() > 500)
new RuntimeException(
receiverClassName
+ " has "
+ subTypeSet.size()
+ " subclasses, "
+ result.size()
+ " of which implement "
+ methodName
+ methodSig
+ " "
+ invokeInstruction)
.printStackTrace(System.out);
}
}
return result;
}
/**
* Return whether or not the given method is concrete.
*
* @param xmethod the method
* @return true if the method is concrete, false otherwise
*/
@Deprecated
public static boolean isConcrete(XMethod xmethod) {
int accessFlags = xmethod.getAccessFlags();
return (accessFlags & Constants.ACC_ABSTRACT) == 0 && (accessFlags & Constants.ACC_NATIVE) == 0;
}
public boolean choose(XMethod method) {
return accessFlagsAreConcrete(method.getAccessFlags());
}