================
@@ -1349,6 +1350,98 @@ void CodeGenFunction::EmitAllocTokenHint(llvm::CallBase
*CB,
CB->setMetadata(llvm::LLVMContext::MD_alloc_token_hint, MDN);
}
+/// Infer type from a simple sizeof expression.
+static QualType inferTypeFromSizeofExpr(const Expr *E) {
+ const Expr *Arg = E->IgnoreParenImpCasts();
+ if (const auto *UET = dyn_cast<UnaryExprOrTypeTraitExpr>(Arg)) {
+ if (UET->getKind() == UETT_SizeOf) {
+ if (UET->isArgumentType()) {
+ return UET->getArgumentTypeInfo()->getType();
+ } else {
+ return UET->getArgumentExpr()->getType();
+ }
+ }
+ }
+ return QualType();
+}
+
+/// Infer type from an arithmetic expression involving a sizeof.
+static QualType inferTypeFromArithSizeofExpr(const Expr *E) {
+ const Expr *Arg = E->IgnoreParenImpCasts();
+ // The argument is a lone sizeof expression.
+ QualType QT = inferTypeFromSizeofExpr(Arg);
----------------
fmayer wrote:
```
if (QualType QT = inferTypeFromSizeofExpr(Arg); !QT.isNull())
return QT;
```
and below
https://github.com/llvm/llvm-project/pull/156841
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