MarcusJohnson91 added inline comments.
================
Comment at: clang/lib/AST/Type.cpp:1980-2002
+bool Type::isChar16Type(const LangOptions &LangOpts) const {
if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
- return BT->getKind() == BuiltinType::Char16;
- return false;
-}
-
-bool Type::isChar32Type() const {
- if (const auto *BT = dyn_cast<BuiltinType>(CanonicalType))
- return BT->getKind() == BuiltinType::Char32;
- return false;
-}
-
-/// Determine whether this type is any of the built-in character
-/// types.
-bool Type::isAnyCharacterType() const {
- const auto *BT = dyn_cast<BuiltinType>(CanonicalType);
- if (!BT) return false;
- switch (BT->getKind()) {
- default: return false;
- case BuiltinType::Char_U:
- case BuiltinType::UChar:
- case BuiltinType::WChar_U:
- case BuiltinType::Char8:
- case BuiltinType::Char16:
- case BuiltinType::Char32:
- case BuiltinType::Char_S:
- case BuiltinType::SChar:
- case BuiltinType::WChar_S:
- return true;
+ if (BT->getKind() == BuiltinType::Char16)
+ return true;
+ if (!LangOpts.CPlusPlus) {
+ return isType("char16_t");
}
----------------
aaron.ballman wrote:
> If I understand properly, one issue is that `char16_t` is defined by C to be
> *the same type* as `uint_least16_t`, which itself is a typedef to some other
> integer type. So we can't make `char16_t` be a distinct type in C, it has to
> be a typedef to a typedef to an integer type.
>
> One concern I have about the approach in this patch is that it makes the type
> system a bit more convoluted. This type is *not* really a character type in
> C, it's a typedef type that playacts as a character type. I think this is a
> pretty fundamental change to the type system in the compiler in some ways
> because this query is no longer about the canonical type but about the
> semantics of how the type is expected to be used.
>
> I'd definitely like to hear what @rsmith thinks of this approach.
I see your point, but I'm not sure how else we could get it through the type
checking system without doing it this way?
I tried to be careful to only allow the actual character typedefs through by
making sure char16_t or char32_t is in the typedef chain, and only in C mode.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D103426/new/
https://reviews.llvm.org/D103426
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