/**
* Resolve possible method call targets. This works for both static and instance method calls.
*
* @param invokeInstruction the InvokeInstruction
* @param typeFrame the TypeFrame containing the types of stack values
* @param cpg the ConstantPoolGen
* @return Set of methods which might be called
* @throws DataflowAnalysisException
* @throws ClassNotFoundException
*/
public static Set<JavaClassAndMethod> resolveMethodCallTargets(
InvokeInstruction invokeInstruction, TypeFrame typeFrame, ConstantPoolGen cpg)
throws DataflowAnalysisException, ClassNotFoundException {
short opcode = invokeInstruction.getOpcode();
if (opcode == Constants.INVOKESTATIC) {
HashSet<JavaClassAndMethod> result = new HashSet<JavaClassAndMethod>();
JavaClassAndMethod targetMethod =
findInvocationLeastUpperBound(invokeInstruction, cpg, CONCRETE_METHOD);
if (targetMethod != null) {
result.add(targetMethod);
}
return result;
}
if (!typeFrame.isValid()) {
return new HashSet<JavaClassAndMethod>();
}
Type receiverType;
boolean receiverTypeIsExact;
if (opcode == Constants.INVOKESPECIAL) {
// invokespecial instructions are dispatched to EXACTLY
// the class specified by the instruction
receiverType = ObjectTypeFactory.getInstance(invokeInstruction.getClassName(cpg));
receiverTypeIsExact = false; // Doesn't actually matter
} else {
// For invokevirtual and invokeinterface instructions, we have
// virtual dispatch. By taking the receiver type (which may be a
// subtype of the class specified by the instruction),
// we may get a more precise set of call targets.
int instanceStackLocation = typeFrame.getInstanceStackLocation(invokeInstruction, cpg);
receiverType = typeFrame.getStackValue(instanceStackLocation);
if (!(receiverType instanceof ReferenceType)) {
return new HashSet<JavaClassAndMethod>();
}
receiverTypeIsExact = typeFrame.isExact(instanceStackLocation);
}
if (DEBUG_METHOD_LOOKUP) {
System.out.println(
"[receiver type is "
+ receiverType
+ ", "
+ (receiverTypeIsExact ? "exact]" : " not exact]"));
}
return resolveMethodCallTargets(
(ReferenceType) receiverType, invokeInstruction, cpg, receiverTypeIsExact);
}
/**
* Determine whether one class (or reference type) is a subtype of another.
*
* @param clsName the name of the class or reference type
* @param possibleSupertypeClassName the name of the possible superclass
* @return true if clsName is a subtype of possibleSupertypeClassName, false if not
*/
public static boolean isSubtype(String clsName, String possibleSupertypeClassName)
throws ClassNotFoundException {
ObjectType cls = ObjectTypeFactory.getInstance(clsName);
ObjectType superCls = ObjectTypeFactory.getInstance(possibleSupertypeClassName);
return isSubtype(cls, superCls);
}
/**
* Facade for class hierarchy queries. These typically access the class hierarchy using the {@link
* org.apache.bcel.Repository} class. Callers should generally expect to handle
* ClassNotFoundException for when referenced classes can't be found.
*
* @author David Hovemeyer
*/
public class Hierarchy {
protected static final boolean DEBUG_METHOD_LOOKUP =
SystemProperties.getBoolean("hier.lookup.debug");
/** Type of java.lang.Exception. */
public static final ObjectType EXCEPTION_TYPE =
ObjectTypeFactory.getInstance("java.lang.Exception");
/** Type of java.lang.Error. */
public static final ObjectType ERROR_TYPE = ObjectTypeFactory.getInstance("java.lang.Error");
/** Type of java.lang.RuntimeException. */
public static final ObjectType RUNTIME_EXCEPTION_TYPE =
ObjectTypeFactory.getInstance("java.lang.RuntimeException");
/**
* Determine whether one class (or reference type) is a subtype of another.
*
* @param clsName the name of the class or reference type
* @param possibleSupertypeClassName the name of the possible superclass
* @return true if clsName is a subtype of possibleSupertypeClassName, false if not
*/
public static boolean isSubtype(String clsName, String possibleSupertypeClassName)
throws ClassNotFoundException {
ObjectType cls = ObjectTypeFactory.getInstance(clsName);
ObjectType superCls = ObjectTypeFactory.getInstance(possibleSupertypeClassName);
return isSubtype(cls, superCls);
}
/**
* Determine if one reference type is a subtype of another.
*
* @param t a reference type
* @param possibleSupertype the possible supertype
* @return true if t is a subtype of possibleSupertype, false if not
*/
public static boolean isSubtype(ReferenceType t, ReferenceType possibleSupertype)
throws ClassNotFoundException {
if (Subtypes2.ENABLE_SUBTYPES2) {
return Global.getAnalysisCache().getDatabase(Subtypes2.class).isSubtype(t, possibleSupertype);
} else {
Map<ReferenceType, Boolean> subtypes = subtypeCache.get(possibleSupertype);
if (subtypes == null) {
subtypes = new HashMap<ReferenceType, Boolean>();
subtypeCache.put(possibleSupertype, subtypes);
}
Boolean result = subtypes.get(t);
if (result == null) {
result = Boolean.valueOf(t.isAssignmentCompatibleWith(possibleSupertype));
subtypes.put(t, result);
}
return result;
}
}
static Map<ReferenceType, Map<ReferenceType, Boolean>> subtypeCache =
new HashMap<ReferenceType, Map<ReferenceType, Boolean>>();
/**
* Determine if the given ObjectType reference represents a <em>universal</em> exception handler.
* That is, one that will catch any kind of exception.
*
* @param catchType the ObjectType of the exception handler
* @return true if catchType is null, or if catchType is java.lang.Throwable
*/
public static boolean isUniversalExceptionHandler(ObjectType catchType) {
return catchType == null || catchType.equals(Type.THROWABLE);
}
/**
* Determine if the given ObjectType refers to an unchecked exception (RuntimeException or Error).
*/
public static boolean isUncheckedException(ObjectType type) throws ClassNotFoundException {
return isSubtype(type, RUNTIME_EXCEPTION_TYPE)
|| isSubtype(type, ERROR_TYPE)
|| type.equals(Type.THROWABLE);
}
/**
* Determine if method whose name and signature is specified is a monitor wait operation.
*
* @param methodName name of the method
* @param methodSig signature of the method
* @return true if the method is a monitor wait, false if not
*/
public static boolean isMonitorWait(String methodName, String methodSig) {
return methodName.equals("wait")
&& (methodSig.equals("()V") || methodSig.equals("(J)V") || methodSig.equals("(JI)V"));
}
/**
* Determine if given Instruction is a monitor wait.
*
* @param ins the Instruction
* @param cpg the ConstantPoolGen for the Instruction
* @return true if the instruction is a monitor wait, false if not
*/
public static boolean isMonitorWait(Instruction ins, ConstantPoolGen cpg) {
if (!(ins instanceof InvokeInstruction)) return false;
if (ins.getOpcode() == Constants.INVOKESTATIC) return false;
InvokeInstruction inv = (InvokeInstruction) ins;
String methodName = inv.getMethodName(cpg);
String methodSig = inv.getSignature(cpg);
return isMonitorWait(methodName, methodSig);
}
/**
* Determine if method whose name and signature is specified is a monitor notify operation.
*
* @param methodName name of the method
* @param methodSig signature of the method
* @return true if the method is a monitor notify, false if not
*/
public static boolean isMonitorNotify(String methodName, String methodSig) {
return (methodName.equals("notify") || methodName.equals("notifyAll"))
&& methodSig.equals("()V");
}
/**
* Determine if given Instruction is a monitor wait.
*
* @param ins the Instruction
* @param cpg the ConstantPoolGen for the Instruction
* @return true if the instruction is a monitor wait, false if not
*/
public static boolean isMonitorNotify(Instruction ins, ConstantPoolGen cpg) {
if (!(ins instanceof InvokeInstruction)) return false;
if (ins.getOpcode() == Constants.INVOKESTATIC) return false;
InvokeInstruction inv = (InvokeInstruction) ins;
String methodName = inv.getMethodName(cpg);
String methodSig = inv.getSignature(cpg);
return isMonitorNotify(methodName, methodSig);
}
/**
* Look up the method referenced by given InvokeInstruction. This method does <em>not</em> look
* for implementations in super or subclasses according to the virtual dispatch rules.
*
* @param inv the InvokeInstruction
* @param cpg the ConstantPoolGen used by the class the InvokeInstruction belongs to
* @return the JavaClassAndMethod, or null if no such method is defined in the class
*/
public static JavaClassAndMethod findExactMethod(InvokeInstruction inv, ConstantPoolGen cpg)
throws ClassNotFoundException {
return findExactMethod(inv, cpg, ANY_METHOD);
}
/**
* Look up the method referenced by given InvokeInstruction. This method does <em>not</em> look
* for implementations in super or subclasses according to the virtual dispatch rules.
*
* @param inv the InvokeInstruction
* @param cpg the ConstantPoolGen used by the class the InvokeInstruction belongs to
* @param chooser JavaClassAndMethodChooser to use to pick the method from among the candidates
* @return the JavaClassAndMethod, or null if no such method is defined in the class
*/
public static JavaClassAndMethod findExactMethod(
InvokeInstruction inv, ConstantPoolGen cpg, JavaClassAndMethodChooser chooser)
throws ClassNotFoundException {
String className = inv.getClassName(cpg);
String methodName = inv.getName(cpg);
String methodSig = inv.getSignature(cpg);
JavaClass jclass = Repository.lookupClass(className);
return findMethod(jclass, methodName, methodSig, chooser);
}
/**
* Visit all superclass methods which the given method overrides.
*
* @param method the method
* @param chooser chooser which visits each superclass method
* @return the chosen method, or null if no method is chosen
* @throws ClassNotFoundException
*/
public static JavaClassAndMethod visitSuperClassMethods(
JavaClassAndMethod method, JavaClassAndMethodChooser chooser) throws ClassNotFoundException {
return findMethod(
method.getJavaClass().getSuperClasses(),
method.getMethod().getName(),
method.getMethod().getSignature(),
chooser);
}
/**
* Visit all superinterface methods which the given method implements.
*
* @param method the method
* @param chooser chooser which visits each superinterface method
* @return the chosen method, or null if no method is chosen
* @throws ClassNotFoundException
*/
public static JavaClassAndMethod visitSuperInterfaceMethods(
JavaClassAndMethod method, JavaClassAndMethodChooser chooser) throws ClassNotFoundException {
return findMethod(
method.getJavaClass().getAllInterfaces(),
method.getMethod().getName(),
method.getMethod().getSignature(),
chooser);
}
/**
* Find the least upper bound method in the class hierarchy which could be called by the given
* InvokeInstruction. One reason this method is useful is that it indicates which declared
* exceptions are thrown by the called methods.
*
* <p>
*
* <ul>
* <li>For invokespecial, this is simply an exact lookup.
* <li>For invokestatic and invokevirtual, the named class is searched, followed by superclasses
* up to the root of the object hierarchy (java.lang.Object). Yes, invokestatic really is
* declared to check superclasses. See VMSpec, 2nd ed, sec. 5.4.3.3.
* <li>For invokeinterface, the named class is searched, followed by all interfaces transitively
* declared by the class. (Question: is the order important here? Maybe the VM spec requires
* that the actual interface desired is given, so the extended lookup will not be required.
* Should check.)
* </ul>
*
* @param inv the InvokeInstruction
* @param cpg the ConstantPoolGen used by the class the InvokeInstruction belongs to
* @return the JavaClassAndMethod, or null if no matching method can be found
*/
public static @CheckForNull JavaClassAndMethod findInvocationLeastUpperBound(
InvokeInstruction inv, ConstantPoolGen cpg) throws ClassNotFoundException {
return findInvocationLeastUpperBound(inv, cpg, ANY_METHOD);
}
public static @CheckForNull JavaClassAndMethod findInvocationLeastUpperBound(
InvokeInstruction inv, ConstantPoolGen cpg, JavaClassAndMethodChooser methodChooser)
throws ClassNotFoundException {
if (DEBUG_METHOD_LOOKUP) {
System.out.println(
"Find prototype method for " + SignatureConverter.convertMethodSignature(inv, cpg));
}
short opcode = inv.getOpcode();
if (opcode == Constants.INVOKESTATIC) {
if (methodChooser == INSTANCE_METHOD) return null;
} else {
if (methodChooser == STATIC_METHOD) return null;
}
// Find the method
if (opcode == Constants.INVOKESPECIAL) {
// Non-virtual dispatch
return findExactMethod(inv, cpg, methodChooser);
} else {
String className = inv.getClassName(cpg);
String methodName = inv.getName(cpg);
String methodSig = inv.getSignature(cpg);
if (DEBUG_METHOD_LOOKUP) {
System.out.println("[Class name is " + className + "]");
System.out.println("[Method name is " + methodName + "]");
System.out.println("[Method signature is " + methodSig + "]");
}
if (className.startsWith("[")) {
// Java 1.5 allows array classes to appear as the class name
className = "java.lang.Object";
}
JavaClass jClass = Repository.lookupClass(className);
return findInvocationLeastUpperBound(
jClass, methodName, methodSig, methodChooser, opcode == Constants.INVOKEINTERFACE);
}
}
public static @CheckForNull JavaClassAndMethod findInvocationLeastUpperBound(
JavaClass jClass,
String methodName,
String methodSig,
JavaClassAndMethodChooser methodChooser,
boolean invokeInterface)
throws ClassNotFoundException {
JavaClassAndMethod result = findMethod(jClass, methodName, methodSig, methodChooser);
if (result != null) return result;
if (invokeInterface)
for (JavaClass i : jClass.getInterfaces()) {
result =
findInvocationLeastUpperBound(i, methodName, methodSig, methodChooser, invokeInterface);
if (result != null) return null;
}
else {
JavaClass sClass = jClass.getSuperClass();
if (sClass != null)
return findInvocationLeastUpperBound(
sClass, methodName, methodSig, methodChooser, invokeInterface);
}
return null;
}
/**
* Find the declared exceptions for the method called by given instruction.
*
* @param inv the InvokeInstruction
* @param cpg the ConstantPoolGen used by the class the InvokeInstruction belongs to
* @return array of ObjectTypes of thrown exceptions, or null if we can't find the list of
* declared exceptions
* @deprecated Use {@link Hierarchy2#findDeclaredExceptions(InvokeInstruction,ConstantPoolGen)}
* instead
*/
@Deprecated
public static ObjectType[] findDeclaredExceptions(InvokeInstruction inv, ConstantPoolGen cpg)
throws ClassNotFoundException {
return Hierarchy2.findDeclaredExceptions(inv, cpg);
}
/**
* Find a method in given class.
*
* @param javaClass the class
* @param methodName the name of the method
* @param methodSig the signature of the method
* @return the JavaClassAndMethod, or null if no such method exists in the class
*/
public static @CheckForNull JavaClassAndMethod findMethod(
JavaClass javaClass, String methodName, String methodSig) {
return findMethod(javaClass, methodName, methodSig, ANY_METHOD);
}
public static @CheckForNull JavaClassAndMethod findMethod(
JavaClass javaClass, String methodName, String methodSig, JavaClassAndMethodChooser chooser) {
if (DEBUG_METHOD_LOOKUP) {
System.out.println("Check " + javaClass.getClassName());
}
Method[] methodList = javaClass.getMethods();
for (Method method : methodList)
if (method.getName().equals(methodName) && method.getSignature().equals(methodSig)) {
JavaClassAndMethod m = new JavaClassAndMethod(javaClass, method);
if (chooser.choose(m)) {
if (DEBUG_METHOD_LOOKUP) {
System.out.println("\t==> FOUND: " + method);
}
return m;
}
}
if (DEBUG_METHOD_LOOKUP) {
System.out.println("\t==> NOT FOUND");
}
return null;
}
/**
* Find a method in given class.
*
* @param classDesc the class descriptor
* @param methodName the name of the method
* @param methodSig the signature of the method
* @param isStatic are we looking for a static method?
* @return the JavaClassAndMethod, or null if no such method exists in the class
*/
public static @CheckForNull XMethod findMethod(
ClassDescriptor classDesc, String methodName, String methodSig, boolean isStatic) {
if (DEBUG_METHOD_LOOKUP) {
System.out.println("Check " + classDesc.getClassName());
}
try {
XClass xClass = Global.getAnalysisCache().getClassAnalysis(XClass.class, classDesc);
return xClass.findMethod(methodName, methodSig, isStatic);
} catch (CheckedAnalysisException e) {
AnalysisContext.logError("Error looking for " + classDesc + "." + methodName + methodSig, e);
return null;
}
}
/**
* Find a method in given class.
*
* @param javaClass the class
* @param methodName the name of the method
* @param methodSig the signature of the method
* @return the JavaClassAndMethod, or null if no such method exists in the class
*/
@Deprecated
public static @CheckForNull JavaClassAndMethod findConcreteMethod(
JavaClass javaClass, String methodName, String methodSig) {
if (DEBUG_METHOD_LOOKUP) {
System.out.println("Check " + javaClass.getClassName());
}
Method[] methodList = javaClass.getMethods();
for (Method method : methodList)
if (method.getName().equals(methodName)
&& method.getSignature().equals(methodSig)
&& accessFlagsAreConcrete(method.getAccessFlags())) {
JavaClassAndMethod m = new JavaClassAndMethod(javaClass, method);
return m;
}
if (DEBUG_METHOD_LOOKUP) {
System.out.println("\t==> NOT FOUND");
}
return null;
}
/**
* Find a method in given class.
*
* @param javaClass the class
* @param methodName the name of the method
* @param methodSig the signature of the method
* @param chooser the JavaClassAndMethodChooser to use to screen possible candidates
* @return the XMethod, or null if no such method exists in the class
*/
@Deprecated
public static @CheckForNull XMethod findXMethod(
JavaClass javaClass, String methodName, String methodSig, JavaClassAndMethodChooser chooser) {
JavaClassAndMethod result = findMethod(javaClass, methodName, methodSig, chooser);
return result == null
? null
: XFactory.createXMethod(result.getJavaClass(), result.getMethod());
}
/** JavaClassAndMethodChooser which accepts any method. */
public static final JavaClassAndMethodChooser ANY_METHOD =
new JavaClassAndMethodChooser() {
public boolean choose(JavaClassAndMethod javaClassAndMethod) {
return true;
}
public boolean choose(XMethod method) {
return true;
}
};
// FIXME: perhaps native methods should be concrete.
public static boolean accessFlagsAreConcrete(int accessFlags) {
return (accessFlags & Constants.ACC_ABSTRACT) == 0 && (accessFlags & Constants.ACC_NATIVE) == 0;
}
/** JavaClassAndMethodChooser which accepts only concrete (not abstract or native) methods. */
public static final JavaClassAndMethodChooser CONCRETE_METHOD =
new JavaClassAndMethodChooser() {
public boolean choose(JavaClassAndMethod javaClassAndMethod) {
Method method = javaClassAndMethod.getMethod();
int accessFlags = method.getAccessFlags();
return accessFlagsAreConcrete(accessFlags);
}
public boolean choose(XMethod method) {
return accessFlagsAreConcrete(method.getAccessFlags());
}
};
/** JavaClassAndMethodChooser which accepts only static methods. */
public static final JavaClassAndMethodChooser STATIC_METHOD =
new JavaClassAndMethodChooser() {
public boolean choose(JavaClassAndMethod javaClassAndMethod) {
return javaClassAndMethod.getMethod().isStatic();
}
public boolean choose(XMethod method) {
return method.isStatic();
}
};
/** JavaClassAndMethodChooser which accepts only instance methods. */
public static final JavaClassAndMethodChooser INSTANCE_METHOD =
new JavaClassAndMethodChooser() {
public boolean choose(JavaClassAndMethod javaClassAndMethod) {
return !javaClassAndMethod.getMethod().isStatic();
}
public boolean choose(XMethod method) {
return !method.isStatic();
}
};
/**
* Find a method in given list of classes, searching the classes in order.
*
* @param classList list of classes in which to search
* @param methodName the name of the method
* @param methodSig the signature of the method
* @return the JavaClassAndMethod, or null if no such method exists in the class
*/
@Deprecated
public static JavaClassAndMethod findMethod(
JavaClass[] classList, String methodName, String methodSig) {
return findMethod(classList, methodName, methodSig, ANY_METHOD);
}
/**
* Find a method in given list of classes, searching the classes in order.
*
* @param classList list of classes in which to search
* @param methodName the name of the method
* @param methodSig the signature of the method
* @param chooser JavaClassAndMethodChooser to select which methods are considered; it must return
* true for a method to be returned
* @return the JavaClassAndMethod, or null if no such method exists in the class
*/
public static JavaClassAndMethod findMethod(
JavaClass[] classList,
String methodName,
String methodSig,
JavaClassAndMethodChooser chooser) {
JavaClassAndMethod m = null;
for (JavaClass cls : classList) {
if ((m = findMethod(cls, methodName, methodSig, chooser)) != null) break;
}
return m;
}
/**
* Find XMethod for method in given list of classes, searching the classes in order.
*
* @param classList list of classes in which to search
* @param methodName the name of the method
* @param methodSig the signature of the method
* @return the XMethod, or null if no such method exists in the class
*/
@Deprecated
public static XMethod findXMethod(JavaClass[] classList, String methodName, String methodSig) {
return findXMethod(classList, methodName, methodSig, ANY_METHOD);
}
/**
* Find XMethod for method in given list of classes, searching the classes in order.
*
* @param classList list of classes in which to search
* @param methodName the name of the method
* @param methodSig the signature of the method
* @param chooser JavaClassAndMethodChooser to select which methods are considered; it must return
* true for a method to be returned
* @return the XMethod, or null if no such method exists in the class
*/
@Deprecated
public static XMethod findXMethod(
JavaClass[] classList,
String methodName,
String methodSig,
JavaClassAndMethodChooser chooser) {
for (JavaClass cls : classList) {
JavaClassAndMethod m;
if ((m = findMethod(cls, methodName, methodSig)) != null && chooser.choose(m)) {
return XFactory.createXMethod(cls, m.getMethod());
}
}
return null;
}
/**
* Resolve possible method call targets. This works for both static and instance method calls.
*
* @param invokeInstruction the InvokeInstruction
* @param typeFrame the TypeFrame containing the types of stack values
* @param cpg the ConstantPoolGen
* @return Set of methods which might be called
* @throws DataflowAnalysisException
* @throws ClassNotFoundException
*/
public static Set<JavaClassAndMethod> resolveMethodCallTargets(
InvokeInstruction invokeInstruction, TypeFrame typeFrame, ConstantPoolGen cpg)
throws DataflowAnalysisException, ClassNotFoundException {
short opcode = invokeInstruction.getOpcode();
if (opcode == Constants.INVOKESTATIC) {
HashSet<JavaClassAndMethod> result = new HashSet<JavaClassAndMethod>();
JavaClassAndMethod targetMethod =
findInvocationLeastUpperBound(invokeInstruction, cpg, CONCRETE_METHOD);
if (targetMethod != null) {
result.add(targetMethod);
}
return result;
}
if (!typeFrame.isValid()) {
return new HashSet<JavaClassAndMethod>();
}
Type receiverType;
boolean receiverTypeIsExact;
if (opcode == Constants.INVOKESPECIAL) {
// invokespecial instructions are dispatched to EXACTLY
// the class specified by the instruction
receiverType = ObjectTypeFactory.getInstance(invokeInstruction.getClassName(cpg));
receiverTypeIsExact = false; // Doesn't actually matter
} else {
// For invokevirtual and invokeinterface instructions, we have
// virtual dispatch. By taking the receiver type (which may be a
// subtype of the class specified by the instruction),
// we may get a more precise set of call targets.
int instanceStackLocation = typeFrame.getInstanceStackLocation(invokeInstruction, cpg);
receiverType = typeFrame.getStackValue(instanceStackLocation);
if (!(receiverType instanceof ReferenceType)) {
return new HashSet<JavaClassAndMethod>();
}
receiverTypeIsExact = typeFrame.isExact(instanceStackLocation);
}
if (DEBUG_METHOD_LOOKUP) {
System.out.println(
"[receiver type is "
+ receiverType
+ ", "
+ (receiverTypeIsExact ? "exact]" : " not exact]"));
}
return resolveMethodCallTargets(
(ReferenceType) receiverType, invokeInstruction, cpg, receiverTypeIsExact);
}
/**
* Resolve possible instance method call targets. Assumes that invokevirtual and invokeinterface
* methods may call any subtype of the receiver class.
*
* @param receiverType type of the receiver object
* @param invokeInstruction the InvokeInstruction
* @param cpg the ConstantPoolGen
* @return Set of methods which might be called
* @throws ClassNotFoundException
*/
public static Set<JavaClassAndMethod> resolveMethodCallTargets(
ReferenceType receiverType, InvokeInstruction invokeInstruction, ConstantPoolGen cpg)
throws ClassNotFoundException {
return resolveMethodCallTargets(receiverType, invokeInstruction, cpg, false);
}
/**
* 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;
}
/**
* Find a field with given name defined in given class.
*
* @param className the name of the class
* @param fieldName the name of the field
* @return the Field, or null if no such field could be found
*/
public static Field findField(String className, String fieldName) throws ClassNotFoundException {
JavaClass jclass = Repository.lookupClass(className);
while (jclass != null) {
Field[] fieldList = jclass.getFields();
for (Field field : fieldList) {
if (field.getName().equals(fieldName)) {
return field;
}
}
jclass = jclass.getSuperClass();
}
return null;
}
/**
* Look up a field with given name and signature in given class, returning it as an {@link XField
* XField} object. If a field can't be found in the immediate class, its superclass is search, and
* so forth.
*
* @param className name of the class through which the field is referenced
* @param fieldName name of the field
* @param fieldSig signature of the field
* @param isStatic true if field is static, false otherwise
* @return an XField object representing the field, or null if no such field could be found
*/
public static XField findXField(
String className, String fieldName, String fieldSig, boolean isStatic)
throws ClassNotFoundException {
return XFactory.createXField(className, fieldName, fieldSig, isStatic);
}
/**
* Look up the field referenced by given FieldInstruction, returning it as an {@link XField
* XField} object.
*
* @param fins the FieldInstruction
* @param cpg the ConstantPoolGen used by the class containing the instruction
* @return an XField object representing the field, or null if no such field could be found
*/
public static XField findXField(FieldInstruction fins, @NonNull ConstantPoolGen cpg)
throws ClassNotFoundException {
String className = fins.getClassName(cpg);
String fieldName = fins.getFieldName(cpg);
String fieldSig = fins.getSignature(cpg);
boolean isStatic =
(fins.getOpcode() == Constants.GETSTATIC || fins.getOpcode() == Constants.PUTSTATIC);
XField xfield = findXField(className, fieldName, fieldSig, isStatic);
short opcode = fins.getOpcode();
if (xfield != null
&& xfield.isResolved()
&& xfield.isStatic() == (opcode == Constants.GETSTATIC || opcode == Constants.PUTSTATIC))
return xfield;
else return null;
}
/**
* Determine whether the given INVOKESTATIC instruction is an inner-class field accessor method.
*
* @param inv the INVOKESTATIC instruction
* @param cpg the ConstantPoolGen for the method
* @return true if the instruction is an inner-class field accessor, false if not
*/
public static boolean isInnerClassAccess(INVOKESTATIC inv, ConstantPoolGen cpg) {
String methodName = inv.getName(cpg);
return methodName.startsWith("access$");
}
/**
* Get the InnerClassAccess for access method called by given INVOKESTATIC.
*
* @param inv the INVOKESTATIC instruction
* @param cpg the ConstantPoolGen for the method
* @return the InnerClassAccess, or null if the instruction is not an inner-class access
*/
public static InnerClassAccess getInnerClassAccess(INVOKESTATIC inv, ConstantPoolGen cpg)
throws ClassNotFoundException {
String className = inv.getClassName(cpg);
String methodName = inv.getName(cpg);
String methodSig = inv.getSignature(cpg);
InnerClassAccess access =
AnalysisContext.currentAnalysisContext()
.getInnerClassAccessMap()
.getInnerClassAccess(className, methodName);
return (access != null && access.getMethodSignature().equals(methodSig)) ? access : null;
}
}
private Pattern visitPatternDescr(PatternDescr descr, VerifierComponent parent, int orderNumber)
throws UnknownDescriptionException {
objectType = data.getObjectTypeByFullName(descr.getObjectType());
if (objectType == null) {
Import objectImport = data.getImportByName(descr.getObjectType());
if (objectImport != null) {
objectType = ObjectTypeFactory.createObjectType(objectImport);
} else {
objectType = ObjectTypeFactory.createObjectType(descr.getObjectType());
}
data.add(objectType);
}
pattern = new Pattern(rule);
if (parent != null) {
pattern.setParentPath(parent.getPath());
pattern.setParentType(parent.getVerifierComponentType());
}
pattern.setObjectTypePath(objectType.getPath());
pattern.setName(objectType.getName());
pattern.setPatternNot(solvers.getRuleSolver().isChildNot());
pattern.setPatternExists(solvers.getRuleSolver().isExists());
pattern.setPatternForall(solvers.getRuleSolver().isForall());
pattern.setOrderNumber(orderNumber);
if (descr.getIdentifier() != null) {
Variable variable = new Variable(rule);
variable.setName(descr.getIdentifier());
variable.setObjectTypeType(VerifierComponentType.OBJECT_TYPE.getType());
variable.setObjectTypePath(objectType.getPath());
variable.setObjectTypeType(descr.getObjectType());
data.add(variable);
}
// visit source.
if (descr.getSource() != null) {
visit(descr.getSource());
} else {
if (workingMemory == null) {
workingMemory = new WorkingMemory();
data.add(workingMemory);
}
pattern.setSourcePath(workingMemory.getPath());
pattern.setSourceType(workingMemory.getVerifierComponentType());
}
solvers.startPatternSolver(pattern);
visit(descr.getConstraint());
solvers.endPatternSolver();
data.add(pattern);
return pattern;
}