@Override
public boolean visitIfExpression(@NotNull UIfExpression node) {
UExpression condition = node.getCondition();
UExpression body = node.getThenBranch();
UElement elseBody = node.getElseBranch();
condition.accept(this);
if (body != null) {
boolean wasReachable = mReachable;
body.accept(this);
mReachable = wasReachable;
}
if (elseBody != null) {
boolean wasReachable = mReachable;
elseBody.accept(this);
mReachable = wasReachable;
}
return false;
}
private static int calculateValue(UastAndroidContext context, UExpression expression) {
// This function assumes that the only inputs to the expression are static integer
// flags that combined via bitwise operands.
if (UastLiteralUtils.isIntegralLiteral(expression)) {
return (int) UastLiteralUtils.getLongValue((ULiteralExpression) expression);
}
if (expression instanceof UResolvable) {
UDeclaration resolvedNode = ((UResolvable) expression).resolve(context);
if (resolvedNode instanceof UVariable) {
UExpression initializer = ((UVariable) resolvedNode).getInitializer();
if (initializer != null) {
Object value = initializer.evaluate();
if (value instanceof Integer) {
return (Integer) value;
}
}
}
}
if (expression instanceof UBinaryExpression) {
UBinaryExpression binaryExpression = (UBinaryExpression) expression;
UastBinaryOperator operator = binaryExpression.getOperator();
int leftValue = calculateValue(context, binaryExpression.getLeftOperand());
int rightValue = calculateValue(context, binaryExpression.getRightOperand());
if (operator == UastBinaryOperator.BITWISE_OR) {
return leftValue | rightValue;
}
if (operator == UastBinaryOperator.BITWISE_AND) {
return leftValue & rightValue;
}
if (operator == UastBinaryOperator.BITWISE_XOR) {
return leftValue ^ rightValue;
}
}
return 0;
}
@Override
public void visitCall(UastAndroidContext context, UCallExpression node) {
String lhs = getLhs(node);
if (lhs == null) {
return;
}
UFunction method = UastUtils.getContainingFunction(node);
if (method == null) {
return;
} else if (method != mLastMethod) {
mIds = Maps.newHashMap();
mLhs = Maps.newHashMap();
mCallOperands = Maps.newHashMap();
mLastMethod = method;
}
UElement parent = node.getParent();
String callOperand = "";
if (parent instanceof UQualifiedExpression) {
callOperand = ((UQualifiedExpression) parent).getReceiver().renderString();
}
UExpression first = node.getValueArguments().get(0);
if (first instanceof UQualifiedExpression) {
UQualifiedExpression select = (UQualifiedExpression) first;
String id = select.getSelector().renderString();
UExpression operand = select.getReceiver();
if (operand instanceof UQualifiedExpression) {
UQualifiedExpression type = (UQualifiedExpression) operand;
if (type.getSelector().renderString().equals(RESOURCE_CLZ_ID)) {
if (mIds.containsKey(id)) {
if (lhs.equals(mLhs.get(id))) {
return;
}
if (!callOperand.equals(mCallOperands.get(id))) {
return;
}
UCallExpression earlierCall = mIds.get(id);
if (!isReachableFrom(method, earlierCall, node)) {
return;
}
Location location = context.getLocation(node);
Location secondary = context.getLocation(earlierCall);
if (location != null && secondary != null) {
secondary.setMessage("First usage here");
location.setSecondary(secondary);
context.report(
ISSUE,
node,
location,
String.format(
"The id `%1$s` has already been looked up in this method; possible "
+ "cut & paste error?",
first.toString()));
}
} else {
mIds.put(id, node);
mLhs.put(id, lhs);
mCallOperands.put(id, callOperand);
}
}
}
}
}