https://bugs.llvm.org/show_bug.cgi?id=50122
Bug ID: 50122
Summary: Parser::ParseCastExpression - dodgy unused write
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org, martongab...@gmail.com,
neeil...@live.com, richard-l...@metafoo.co.uk,
saar@raz.email
The static analyzer is warning about an unread variable write in
Parser::ParseCastExpression:
switch (SavedKind) {
case tok::l_paren: {
// If this expression is limited to being a unary-expression, the paren can
// not start a cast expression.
ParenParseOption ParenExprType;
switch (ParseKind) {
case CastParseKind::UnaryExprOnly:
if (!getLangOpts().CPlusPlus)
ParenExprType = CompoundLiteral; // <<<< UNUSED WRITE WARNING
LLVM_FALLTHROUGH;
case CastParseKind::AnyCastExpr:
ParenExprType = ParenParseOption::CastExpr;
break;
case CastParseKind::PrimaryExprOnly:
ParenExprType = FoldExpr;
break;
}
This looks like it was introduced in https://reviews.llvm.org/D43357
Before that the code looked like:
ParenParseOption ParenExprType =
(isUnaryExpression && !getLangOpts().CPlusPlus) ? CompoundLiteral
: CastExpr;
So maybe we're missing a break ?
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