/// Note: The usual conversions are *not* applied to the operand of the &
/// operator (C99 6.3.2.1p[2-4]), and its result is never an lvalue.
QualType Sema::CheckAddressOfOperand(Expr *op, SourceLocation OpLoc) {
+ if (getLangOptions().C99) {
+ // Implement C99-only parts of addressof rules.
+ if (UnaryOperator* uOp = dyn_cast<UnaryOperator>(op)) {
+ if (uOp->getOpcode() == UnaryOperator::Deref)
+ // Per C99 6.5.3.2, the address of a deref always returns a valid result
+ // (assuming the deref expression is valid).
+ return uOp->getSubExpr()->getType();
+ }
+ // Technically, there should be a check for array subscript
+ // expressions here, but the result of one is always an lvalue anyway.
+ }
Decl *dcl = getPrimaryDeclaration(op);
Expr::isLvalueResult lval = op->isLvalue();
QualType qType = op->getType();
if (const PointerType *PT = qType->getAsPointerType()) {
- QualType ptype = PT->getPointeeType();
- // C99 6.5.3.2p4. "if it points to an object,...".
- if (ptype->isIncompleteType()) { // An incomplete type is not an object
- // GCC compat: special case 'void *' (treat as extension, not error).
- if (ptype->isVoidType()) {
- Diag(OpLoc, diag::ext_typecheck_deref_ptr_to_void,op->getSourceRange());
- } else {
- Diag(OpLoc, diag::err_typecheck_deref_incomplete_type,
- ptype.getAsString(), op->getSourceRange());
- return QualType();
- }
- }
- return ptype;
+ // Note that per both C89 and C99, this is always legal, even
+ // if ptype is an incomplete type or void.
+ // It would be possible to warn about dereferencing a
+ // void pointer, but it's completely well-defined,
+ // and such a warning is unlikely to catch any mistakes.
+ return PT->getPointeeType();
}
Diag(OpLoc, diag::err_typecheck_indirection_requires_pointer,
qType.getAsString(), op->getSourceRange());
"invalid argument type to unary expression '%0'")
DIAG(err_typecheck_indirection_requires_pointer, ERROR,
"indirection requires pointer operand ('%0' invalid)")
-DIAG(err_typecheck_deref_incomplete_type, ERROR,
- "dereferencing pointer to incomplete type '%0'")
-DIAG(ext_typecheck_deref_ptr_to_void, WARNING,
- "dereferencing void pointer")
DIAG(err_typecheck_invalid_operands, ERROR,
"invalid operands to binary expression ('%0' and '%1')")
DIAG(err_typecheck_sub_ptr_object, ERROR,