public List<Pair<PsiReferenceExpression, DfaConstValue>> getConstantReferenceValues() {
List<Pair<PsiReferenceExpression, DfaConstValue>> result = ContainerUtil.newArrayList();
for (PushInstruction instruction : myPossibleVariableValues.keySet()) {
Collection<Object> values = myPossibleVariableValues.get(instruction);
if (values.size() == 1) {
Object singleValue = values.iterator().next();
if (singleValue != ANY_VALUE) {
result.add(
Pair.create(
(PsiReferenceExpression) instruction.getPlace(), (DfaConstValue) singleValue));
}
}
}
return result;
}
@Override
public DfaInstructionState[] visitPush(
PushInstruction instruction, DataFlowRunner runner, DfaMemoryState memState) {
if (instruction.isReferenceRead()) {
DfaValue dfaValue = instruction.getValue();
if (dfaValue instanceof DfaVariableValue) {
DfaConstValue constValue = memState.getConstantValue((DfaVariableValue) dfaValue);
myPossibleVariableValues.putValue(
instruction,
constValue != null
&& (constValue.getValue() == null || constValue.getValue() instanceof Boolean)
? constValue
: ANY_VALUE);
}
}
return super.visitPush(instruction, runner, memState);
}