commit 3a8244df6fb88a6670470e603445c72f224db9e3
author Richard Smith <richard-llvm@metafoo.co.uk> Tue May 01 05:02:45 2018 +0000
committer Richard Smith <richard-llvm@metafoo.co.uk> Tue May 01 05:02:45 2018 +0000
tree 197016a8600cd39037941ce7079e0d9867edacb0
parent 33dc01d105c08644c5b08c8c37879c6528edfdea

Implement P0482R2, support for char8_t type.

This is not yet part of any C++ working draft, and so is controlled by the flag
-fchar8_t rather than a -std= flag. (The GCC implementation is controlled by a
flag with the same name.)

This implementation is experimental, and will be removed or revised
substantially to match the proposal as it makes its way through the C++
committee.

llvm-svn: 331244

clang/lib/AST/ASTContext.cpp

diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index d61ca58..d510714 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -1151,6 +1151,9 @@
 
   WIntTy = getFromTargetType(Target.getWIntType());
 
+  // C++20 (proposed)
+  InitBuiltinType(Char8Ty,              BuiltinType::Char8);
+
   if (LangOpts.CPlusPlus) // C++0x 3.9.1p5, extension for C++
     InitBuiltinType(Char16Ty,           BuiltinType::Char16);
   else // C99
@@ -1739,6 +1742,7 @@
     case BuiltinType::Char_U:
     case BuiltinType::UChar:
     case BuiltinType::SChar:
+    case BuiltinType::Char8:
       Width = Target->getCharWidth();
       Align = Target->getCharAlign();
       break;
@@ -5456,6 +5460,7 @@
     // FIXME: Is there some better way to compute this?
     if (BT->getKind() == BuiltinType::WChar_S ||
         BT->getKind() == BuiltinType::WChar_U ||
+        BT->getKind() == BuiltinType::Char8 ||
         BT->getKind() == BuiltinType::Char16 ||
         BT->getKind() == BuiltinType::Char32) {
       bool FromIsSigned = BT->getKind() == BuiltinType::WChar_S;
@@ -6202,6 +6207,7 @@
     switch (kind) {
     case BuiltinType::Void:       return 'v';
     case BuiltinType::Bool:       return 'B';
+    case BuiltinType::Char8:
     case BuiltinType::Char_U:
     case BuiltinType::UChar:      return 'C';
     case BuiltinType::Char16: