else if (UnaryOperator* U = dyn_cast<UnaryOperator>(S)) {
if (!U->isIncrementOp())
return;
+
+ // Handle: ++x within a subexpression. The solution is not warn
+ // about preincrements to dead variables when the preincrement occurs
+ // as a subexpression. This can lead to false negatives, e.g. "(++x);"
+ // A generalized dead code checker should find such issues.
+ if (U->isPrefix() && Parents.isSubExpr(U))
+ return;
Expr *Ex = U->getSubExpr()->IgnoreParenCasts();
int f11() {
int x = 4;
- return ++x; // expected-warning{{never read}}
+ return x++; // expected-warning{{never read}}
}
+int f11b() {
+ int x = 4;
+ return ++x; // no-warning
+}
+
+
int f12a(int y) {
int x = y; // expected-warning{{never read}}
return 1;