Define two types to be "compatible" in C++ if they are the same, and

remove some age-old FIXMEs and C++ workarounds within the
type-compatibility logic.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95249 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/AST/ASTContext.cpp b/lib/AST/ASTContext.cpp
index 46c5b41f931472acead823d877450387017a8085..d6c9041e3e97834eedc621e54b5e9119627655c7 100644 (file)
--- a/lib/AST/ASTContext.cpp
+++ b/lib/AST/ASTContext.cpp
@@ -4244,6 +4244,9 @@ bool ASTContext::areComparableObjCPointerTypes(QualType LHS, QualType RHS) {
 /// C99 6.2.7p1: Two types have compatible types if their types are the
 /// same. See 6.7.[2,3,5] for additional rules.
 bool ASTContext::typesAreCompatible(QualType LHS, QualType RHS) {
+  if (getLangOptions().CPlusPlus)
+    return hasSameType(LHS, RHS);
+  
   return !mergeTypes(LHS, RHS).isNull();
 }
 
@@ -4359,15 +4362,9 @@ QualType ASTContext::mergeTypes(QualType LHS, QualType RHS) {
   // designates the object or function denoted by the reference, and the
   // expression is an lvalue unless the reference is an rvalue reference and
   // the expression is a function call (possibly inside parentheses).
-  // FIXME: C++ shouldn't be going through here!  The rules are different
-  // enough that they should be handled separately.
-  // FIXME: Merging of lvalue and rvalue references is incorrect. C++ *really*
-  // shouldn't be going through here!
-  if (const ReferenceType *RT = LHS->getAs<ReferenceType>())
-    LHS = RT->getPointeeType();
-  if (const ReferenceType *RT = RHS->getAs<ReferenceType>())
-    RHS = RT->getPointeeType();
-
+  assert(!LHS->getAs<ReferenceType>() && "LHS is a reference type?");
+  assert(!RHS->getAs<ReferenceType>() && "RHS is a reference type?");
+  
   QualType LHSCan = getCanonicalType(LHS),
            RHSCan = getCanonicalType(RHS);