/** Method invocation. */
public void visitInvokeInstruction(InvokeInstruction i) {
Type[] argTypes = i.getArgumentTypes(cp);
for (int j = 0; j < argTypes.length; j++) cv.registerCoupling(argTypes[j]);
cv.registerCoupling(i.getReturnType(cp));
/* Measuring decision: measure overloaded methods separately */
cv.registerMethodInvocation(i.getClassName(cp), i.getMethodName(cp), argTypes);
}
private void checkForPossibleObligationTransfer(
InvokeInstruction inv, InstructionHandle handle) throws ClassNotFoundException {
//
// We will assume that a method invocation might transfer
// an obligation from one type to another if
// 1. either
// - it's a constructor where the constructed
// type and exactly one param type
// are obligation types, or
// - it's a method where the return type and
// exactly one param type are obligation types
// 2. at least one instance of the resource "consumed"
// by the transfer exists at the point of the transfer.
// E.g., if we see a transfer of InputStream->Reader,
// there must be an instance of InputStream at
// the transfer point.
//
if (DEBUG_FP) {
System.out.println("Checking " + handle + " as possible obligation transfer...:");
}
// Find the State which is a prefix of the error state
// at the location of this (possible) transfer.
State transferState = getTransferState(handle);
if (transferState == null) {
if (DEBUG_FP) {
System.out.println("No transfer state???");
}
return;
}
String methodName = inv.getMethodName(cpg);
Type producedType =
methodName.equals("<init>") ? inv.getReferenceType(cpg) : inv.getReturnType(cpg);
if (DEBUG_FP && !(producedType instanceof ObjectType)) {
System.out.println("Produced type " + producedType + " not an ObjectType");
}
if (producedType instanceof ObjectType) {
Obligation produced =
database.getFactory().getObligationByType((ObjectType) producedType);
if (DEBUG_FP && produced == null) {
System.out.println("Produced type " + producedType + " not an obligation type");
}
if (produced != null) {
XMethod calledMethod = XFactory.createXMethod(inv, cpg);
Obligation[] params = database.getFactory().getParameterObligationTypes(calledMethod);
for (int i = 0; i < params.length; i++) {
Obligation consumed = params[i];
if (DEBUG_FP && consumed == null) {
System.out.println("Param " + i + " not an obligation type");
}
if (DEBUG_FP && consumed != null && consumed.equals(produced)) {
System.out.println("Consumed type is the same as produced type");
}
if (consumed != null && !consumed.equals(produced)) {
// See if an instance of the consumed obligation
// type
// exists here.
if (transferState.getObligationSet().getCount(consumed.getId()) > 0) {
transferList.add(new PossibleObligationTransfer(consumed, produced));
if (DEBUG_FP) {
System.out.println(
"===> Possible transfer of "
+ consumed
+ " to "
+ produced
+ " at "
+ handle);
}
} else if (DEBUG_FP) {
System.out.println(
handle
+ " not a transfer "
+ "of "
+ consumed
+ "->"
+ produced
+ " because no instances of "
+ consumed);
System.out.println("I see " + transferState.getObligationSet());
}
}
}
}
}
}
