PrintAsClang: Print Unicode.Scalar as char32_t and Float16 as _Float16

Author: xymus

lib/PrintAsClang/PrimitiveTypeMapping.cpp

@@ -83,11 +83,14 @@ void PrimitiveTypeMapping::initialize(ASTContext &ctx) {
   MAP(CBool, "bool", false);
 
   MAP(CChar, "char", false);
-  MAP(CWideChar, "wchar_t", false);
   MAP(CChar8, "char8_t", false);
   MAP(CChar16, "char16_t", false);
   MAP(CChar32, "char32_t", false);
 
+  // Set after CChar32 to prefer char32_t for the shared underlying
+  // Unicode.Scalar. char32_t is stable across platforms.
+  MAP(CWideChar, "wchar_t", false);
+
   MAP(CSignedChar, "signed char", false);
   MAP(CShort, "short", false);
   MAP(CInt, "int", false);
@@ -117,6 +120,8 @@ void PrimitiveTypeMapping::initialize(ASTContext &ctx) {
   MAP(Float32, "float", false);
   MAP(Float64, "double", false);
 
+  MAP(Float16, "_Float16", false);
+
   MAP_CXX(Int, "NSInteger", "ptrdiff_t", "swift::Int", false);
   MAP_CXX(UInt, "NSUInteger", "size_t", "swift::UInt", false);
   MAP_C(Bool, "BOOL", "bool", false);

test/PrintAsObjC/unicode-scalar-reference.swift

@@ -11,8 +11,12 @@
 
 @_cdecl("referencesScalar")
 func referencesScalar() -> Unicode.Scalar { fatalError() }
-// CHECK: SWIFT_EXTERN wchar_t referencesScalar(void)
+// CHECK: SWIFT_EXTERN char32_t referencesScalar(void)
 
 @_cdecl("referencesRelated")
 func x_referencesRelated(a: CChar32, b: CWideChar) { }
 // CHECK: SWIFT_EXTERN void referencesRelated(char32_t a, wchar_t b)
+
+@_cdecl("referencesFloat16")
+func y_referencesFloat16(a: Float16, b: CFloat16) { }
+// CHECK: SWIFT_EXTERN void referencesFloat16(_Float16 a, _Float16 b)