Sema: Fix explicit address space cast in C++

Currently clang does not allow implicit cast of a pointer to a pointer type
in different address space but allows C-style cast of a pointer to a pointer
type in different address space. However, there is a bug in Sema causing
incorrect Cast Expr in AST for the latter case, which in turn results in
invalid LLVM IR in codegen.

This is because Sema::IsQualificationConversion returns true for a cast of
pointer to a pointer type in different address space, which in turn allows
a standard conversion and results in a cast expression with no op in AST.

This patch fixes that by let Sema::IsQualificationConversion returns false
for a cast of pointer to a pointer type in different address space, which
in turn disallows standard conversion, implicit cast, and static cast.
Finally it results in an reinterpret cast and correct conversion kind is set.

Differential Revision: https://reviews.llvm.org/D49294

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@337540 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Sema/SemaCast.cpp b/lib/Sema/SemaCast.cpp
index 86633d6dd50cf4e7272e6a6b18dcf175e6d8e6b5..b3f6be4aec73788f1a58c679fe3c9a3f3c4c2709 100644 (file)
--- a/lib/Sema/SemaCast.cpp
+++ b/lib/Sema/SemaCast.cpp
@@ -1955,6 +1955,12 @@ static bool fixOverloadedReinterpretCastExpr(Sema &Self, QualType DestType,
   return Result.isUsable();
 }
 
+static bool IsAddressSpaceConversion(QualType SrcType, QualType DestType) {
+  return SrcType->isPointerType() && DestType->isPointerType() &&
+         SrcType->getAs<PointerType>()->getPointeeType().getAddressSpace() !=
+             DestType->getAs<PointerType>()->getPointeeType().getAddressSpace();
+}
+
 static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
                                         QualType DestType, bool CStyle,
                                         SourceRange OpRange,
@@ -2198,6 +2204,8 @@ static TryCastResult TryReinterpretCast(Sema &Self, ExprResult &SrcExpr,
     } else {
       Kind = CK_BitCast;
     }
+  } else if (IsAddressSpaceConversion(SrcType, DestType)) {
+    Kind = CK_AddressSpaceConversion;
   } else {
     Kind = CK_BitCast;
   }

diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 822c3c0c6b4ffaf59c10cedcd7924e596d6ab68b..390782b35e65f07ef413d3660067c7d705805222 100644 (file)
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -3150,6 +3150,15 @@ Sema::IsQualificationConversion(QualType FromType, QualType ToType,
       = PreviousToQualsIncludeConst && ToQuals.hasConst();
   }
 
+  // Allows address space promotion by language rules implemented in
+  // Type::Qualifiers::isAddressSpaceSupersetOf.
+  Qualifiers FromQuals = FromType.getQualifiers();
+  Qualifiers ToQuals = ToType.getQualifiers();
+  if (!ToQuals.isAddressSpaceSupersetOf(FromQuals) &&
+      !FromQuals.isAddressSpaceSupersetOf(ToQuals)) {
+    return false;
+  }
+
   // We are left with FromType and ToType being the pointee types
   // after unwrapping the original FromType and ToType the same number
   // of types. If we unwrapped any pointers, and if FromType and

diff --git a/test/CodeGenCXX/address-space-cast.cpp b/test/CodeGenCXX/address-space-cast.cpp
new file mode 100644 (file)
index 0000000..334a1a6
--- /dev/null
+++ b/test/CodeGenCXX/address-space-cast.cpp
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 %s -triple=amdgcn-amd-amdhsa -emit-llvm -o - | FileCheck %s
+
+#define __private__ __attribute__((address_space(5)))
+
+void func_pchar(__private__ char *x);
+
+void test_cast(char *gen_ptr) {
+  // CHECK: %[[cast:.*]] = addrspacecast i8* %{{.*}} to i8 addrspace(5)*
+  // CHECK-NEXT: store i8 addrspace(5)* %[[cast]]
+  __private__ char *priv_ptr = (__private__ char *)gen_ptr;
+
+  // CHECK: %[[cast:.*]] = addrspacecast i8* %{{.*}} to i8 addrspace(5)*
+  // CHECK-NEXT: call void @_Z10func_pcharPU3AS5c(i8 addrspace(5)* %[[cast]])
+  func_pchar((__private__ char *)gen_ptr);
+}