[PATCH] D89475: [SemaObjC] Fix composite pointer type calculation for `void*` and pointer to lifetime qualified ObjC pointer type

[Erik Pilkington via Phabricator via cfe-commits]

erik.pilkington created this revision.
erik.pilkington added reviewers: rsmith, rjmccall.
Herald added subscribers: ributzka, dexonsmith, jkorous.
erik.pilkington requested review of this revision.

This fixes a regression introduced in 9a6f4d451ca7aa06b94a407015fbadb456bc09ef 
<https://reviews.llvm.org/rG9a6f4d451ca7aa06b94a407015fbadb456bc09ef>:

  void f() {
    NSString *__strong* sptr;
    void *vptr;
    vptr == sptr; // new error: incompatible pointer types
  }

We're now erroring out on this code because `FindCompositePointerType` is 
rejecting the qualifier mismatch between `void` and `NSString *__strong` after 
stripping one level of pointer types.

rdar://70101809


https://reviews.llvm.org/D89475

Files:
  clang/lib/Sema/SemaExprCXX.cpp
  clang/test/SemaObjCXX/arc-ptr-comparison.mm


Index: clang/test/SemaObjCXX/arc-ptr-comparison.mm
===================================================================
--- clang/test/SemaObjCXX/arc-ptr-comparison.mm
+++ clang/test/SemaObjCXX/arc-ptr-comparison.mm
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only 
-fobjc-arc -verify %s
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only 
-fobjc-runtime-has-weak -fobjc-arc -verify %s
 // RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only 
-verify -DNOARC %s
 #ifdef NOARC
 // expected-no-diagnostics
@@ -51,3 +51,17 @@
   return a == cv;
   return ca == v;
 }
+
+#ifndef NOARC
+int testDoublePtr(void *pv, void **ppv, A *__strong* pspa, A *__weak* pwpa, A 
*__strong** ppspa) {
+  return pv == pspa;
+  return pspa == pv;
+  return pv == pspa;
+  return pv == pwpa;
+  return pspa == pwpa; // expected-error {{comparison of distinct pointer 
types}}
+  return ppv == pspa; // expected-error {{comparison of distinct pointer 
types}}
+  return pspa == ppv; // expected-error {{comparison of distinct pointer 
types}}
+  return pv == ppspa;
+  return ppv == ppspa; // expected-error{{comparison of distinct pointer 
types}}
+}
+#endif
Index: clang/lib/Sema/SemaExprCXX.cpp
===================================================================
--- clang/lib/Sema/SemaExprCXX.cpp
+++ clang/lib/Sema/SemaExprCXX.cpp
@@ -6552,12 +6552,16 @@
       // FIXME: In C, we merge __strong and none to __strong at the top level.
       if (Q1.getObjCGCAttr() == Q2.getObjCGCAttr())
         Quals.setObjCGCAttr(Q1.getObjCGCAttr());
+      else if (T1->isVoidPointerType() || T2->isVoidPointerType())
+        assert(Steps.size() == 1);
       else
         return QualType();
 
       // Mismatched lifetime qualifiers never compatibly include each other.
       if (Q1.getObjCLifetime() == Q2.getObjCLifetime())
         Quals.setObjCLifetime(Q1.getObjCLifetime());
+      else if (T1->isVoidPointerType() || T2->isVoidPointerType())
+        assert(Steps.size() == 1);
       else
         return QualType();
 



Index: clang/test/SemaObjCXX/arc-ptr-comparison.mm
===================================================================
--- clang/test/SemaObjCXX/arc-ptr-comparison.mm
+++ clang/test/SemaObjCXX/arc-ptr-comparison.mm
@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only -fobjc-arc -verify %s
+// RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only -fobjc-runtime-has-weak -fobjc-arc -verify %s
 // RUN: %clang_cc1 -std=c++11 -triple x86_64-apple-darwin11 -fsyntax-only -verify -DNOARC %s
 #ifdef NOARC
 // expected-no-diagnostics
@@ -51,3 +51,17 @@
   return a == cv;
   return ca == v;
 }
+
+#ifndef NOARC
+int testDoublePtr(void *pv, void **ppv, A *__strong* pspa, A *__weak* pwpa, A *__strong** ppspa) {
+  return pv == pspa;
+  return pspa == pv;
+  return pv == pspa;
+  return pv == pwpa;
+  return pspa == pwpa; // expected-error {{comparison of distinct pointer types}}
+  return ppv == pspa; // expected-error {{comparison of distinct pointer types}}
+  return pspa == ppv; // expected-error {{comparison of distinct pointer types}}
+  return pv == ppspa;
+  return ppv == ppspa; // expected-error{{comparison of distinct pointer types}}
+}
+#endif
Index: clang/lib/Sema/SemaExprCXX.cpp
===================================================================
--- clang/lib/Sema/SemaExprCXX.cpp
+++ clang/lib/Sema/SemaExprCXX.cpp
@@ -6552,12 +6552,16 @@
       // FIXME: In C, we merge __strong and none to __strong at the top level.
       if (Q1.getObjCGCAttr() == Q2.getObjCGCAttr())
         Quals.setObjCGCAttr(Q1.getObjCGCAttr());
+      else if (T1->isVoidPointerType() || T2->isVoidPointerType())
+        assert(Steps.size() == 1);
       else
         return QualType();
 
       // Mismatched lifetime qualifiers never compatibly include each other.
       if (Q1.getObjCLifetime() == Q2.getObjCLifetime())
         Quals.setObjCLifetime(Q1.getObjCLifetime());
+      else if (T1->isVoidPointerType() || T2->isVoidPointerType())
+        assert(Steps.size() == 1);
       else
         return QualType();
 

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