@Nullable
private DfaInstructionState[] handleRelationBinop(
BinopInstruction instruction,
DataFlowRunner runner,
DfaMemoryState memState,
DfaValue dfaRight,
DfaValue dfaLeft) {
DfaValueFactory factory = runner.getFactory();
final Instruction next = runner.getInstruction(instruction.getIndex() + 1);
DfaRelationValue dfaRelation =
factory
.getRelationFactory()
.createRelation(dfaLeft, dfaRight, instruction.getOperationSign(), false);
if (dfaRelation == null) {
return null;
}
myCanBeNullInInstanceof.add(instruction);
ArrayList<DfaInstructionState> states = new ArrayList<DfaInstructionState>();
final DfaMemoryState trueCopy = memState.createCopy();
if (trueCopy.applyCondition(dfaRelation)) {
trueCopy.push(factory.getConstFactory().getTrue());
instruction.setTrueReachable();
states.add(new DfaInstructionState(next, trueCopy));
}
//noinspection UnnecessaryLocalVariable
DfaMemoryState falseCopy = memState;
if (falseCopy.applyCondition(dfaRelation.createNegated())) {
falseCopy.push(factory.getConstFactory().getFalse());
instruction.setFalseReachable();
states.add(new DfaInstructionState(next, falseCopy));
if (instruction instanceof InstanceofInstruction && !falseCopy.isNull(dfaLeft)) {
myUsefulInstanceofs.add((InstanceofInstruction) instruction);
}
}
return states.toArray(new DfaInstructionState[states.size()]);
}
@Nullable
private static DfaInstructionState[] handleConstantComparison(
BinopInstruction instruction,
DataFlowRunner runner,
DfaMemoryState memState,
DfaValue dfaRight,
DfaValue dfaLeft,
IElementType opSign) {
if (dfaRight instanceof DfaConstValue && dfaLeft instanceof DfaVariableValue) {
Object value = ((DfaConstValue) dfaRight).getValue();
if (value instanceof Number) {
DfaInstructionState[] result =
checkComparingWithConstant(
instruction,
runner,
memState,
(DfaVariableValue) dfaLeft,
opSign,
((Number) value).doubleValue());
if (result != null) {
return result;
}
}
}
if (dfaRight instanceof DfaVariableValue && dfaLeft instanceof DfaConstValue) {
return handleConstantComparison(
instruction,
runner,
memState,
dfaLeft,
dfaRight,
DfaRelationValue.getSymmetricOperation(opSign));
}
if (EQEQ != opSign && NE != opSign) {
return null;
}
if (dfaLeft instanceof DfaConstValue && dfaRight instanceof DfaConstValue
|| dfaLeft == runner.getFactory().getConstFactory().getContractFail()
|| dfaRight == runner.getFactory().getConstFactory().getContractFail()) {
boolean negated =
(NE == opSign)
^ (DfaMemoryStateImpl.isNaN(dfaLeft) || DfaMemoryStateImpl.isNaN(dfaRight));
if (dfaLeft == dfaRight ^ negated) {
return alwaysTrue(instruction, runner, memState);
}
return alwaysFalse(instruction, runner, memState);
}
return null;
}