[clang] [clang-tools-extra] [Clang] Make the SizeType, SignedSizeType and PtrdiffType be named sugar types instead of built-in types (PR #143653)

[Matheus Izvekov via cfe-commits]

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@@ -6796,14 +6836,25 @@ QualType ASTContext::getTagDeclType(const TagDecl *Decl) const {
 /// getSizeType - Return the unique type for "size_t" (C99 7.17), the result
 /// of the sizeof operator (C99 6.5.3.4p4). The value is target dependent and
 /// needs to agree with the definition in <stddef.h>.
-CanQualType ASTContext::getSizeType() const {
+QualType ASTContext::getSizeType() const { return SizeType; }
+
+CanQualType ASTContext::getCanonicalSizeType() const {
   return getFromTargetType(Target->getSizeType());
 }
 
 /// Return the unique signed counterpart of the integer type
 /// corresponding to size_t.
-CanQualType ASTContext::getSignedSizeType() const {
-  return getFromTargetType(Target->getSignedSizeType());
+QualType ASTContext::getSignedSizeType() const { return SignedSizeType; }
+
+/// getPointerDiffType - Return the unique type for "ptrdiff_t" (C99 7.17)
+/// defined in <stddef.h>. Pointer - pointer requires this (C99 6.5.6p9).
+QualType ASTContext::getPointerDiffType() const { return PtrdiffType; }
+
+/// Return the unique unsigned counterpart of "ptrdiff_t"
+/// integer type. The standard (C11 7.21.6.1p7) refers to this type
+/// in the definition of %tu format specifier.
+QualType ASTContext::getUnsignedPointerDiffType() const {
+  return getFromTargetType(Target->getUnsignedPtrDiffType(LangAS::Default));
 }
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mizvekov wrote:

Ah I see, though I think you meant unsigned?

https://github.com/llvm/llvm-project/pull/143653