Add support for the MS qualifiers __ptr32, __ptr64, __sptr, __uptr.

Summary:
This adds parsing of the qualifiers __ptr32, __ptr64, __sptr, and __uptr and
lowers them to the corresponding address space pointer for 32-bit and 64-bit pointers.
(32/64-bit pointers added in https://reviews.llvm.org/D69639)

A large part of this patch is making these pointers ignore the address space
when doing things like overloading and casting.

https://bugs.llvm.org/show_bug.cgi?id=42359

Reviewers: rnk, rsmith

Subscribers: jholewinski, jvesely, nhaehnle, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D71039

1 files changed, 6 insertions, 2 deletions

diff --git a/clang/lib/Sema/SemaOverload.cpp b/clang/lib/Sema/SemaOverload.cpp
index 32541d6b944..22f1a087ca2 100644
--- a/clang/lib/Sema/SemaOverload.cpp
+++ b/clang/lib/Sema/SemaOverload.cpp
@@ -2933,8 +2933,12 @@ bool Sema::FunctionParamTypesAreEqual(const FunctionProtoType *OldType,
                                               N = NewType->param_type_begin(),
                                               E = OldType->param_type_end();
        O && (O != E); ++O, ++N) {
-    if (!Context.hasSameType(O->getUnqualifiedType(),
-                             N->getUnqualifiedType())) {
+    // Ignore address spaces in pointee type. This is to disallow overloading
+    // on __ptr32/__ptr64 address spaces.
+    QualType Old = Context.removePtrSizeAddrSpace(O->getUnqualifiedType());
+    QualType New = Context.removePtrSizeAddrSpace(N->getUnqualifiedType());
+
+    if (!Context.hasSameType(Old, New)) {
       if (ArgPos)
         *ArgPos = O - OldType->param_type_begin();
       return false;