move sorting of qualifying protocols from the parser into

sema.  This allows clients of the parser to have the unmolested 
list if desired, and guarantees that noone can create an
ObjCQualifiedInterfaceType with an unsorted list.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@49310 91177308-0d34-0410-b5e6-96231b3b80d8

lib/AST/ASTContext.cpp

@@ -811,10 +811,33 @@ QualType ASTContext::getObjCInterfaceType(ObjCInterfaceDecl *Decl) {
   return QualType(Decl->TypeForDecl, 0);
 }
 
+/// CmpProtocolNames - Comparison predicate for sorting protocols
+/// alphabetically.
+static bool CmpProtocolNames(const ObjCProtocolDecl *LHS,
+                            const ObjCProtocolDecl *RHS) {
+  return strcmp(LHS->getName(), RHS->getName()) < 0;
+}
+
+static void SortAndUniqueProtocols(ObjCProtocolDecl **&Protocols,
+                                   unsigned &NumProtocols) {
+  ObjCProtocolDecl **ProtocolsEnd = Protocols+NumProtocols;
+  
+  // Sort protocols, keyed by name.
+  std::sort(Protocols, Protocols+NumProtocols, CmpProtocolNames);
+
+  // Remove duplicates.
+  ProtocolsEnd = std::unique(Protocols, ProtocolsEnd);
+  NumProtocols = ProtocolsEnd-Protocols;
+}
+
+
 /// getObjCQualifiedInterfaceType - Return a ObjCQualifiedInterfaceType type for
 /// the given interface decl and the conforming protocol list.
 QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl,
                        ObjCProtocolDecl **Protocols, unsigned NumProtocols) {
+  // Sort the protocol list alphabetically to canonicalize it.
+  SortAndUniqueProtocols(Protocols, NumProtocols);
+  
   llvm::FoldingSetNodeID ID;
   ObjCQualifiedInterfaceType::Profile(ID, Protocols, NumProtocols);
   
@@ -831,12 +854,14 @@ QualType ASTContext::getObjCQualifiedInterfaceType(ObjCInterfaceDecl *Decl,
   return QualType(QType, 0);
 }
 
-/// getObjCQualifiedIdType - Return a 
-/// getObjCQualifiedIdType type for the 'id' decl and
-/// the conforming protocol list.
+/// getObjCQualifiedIdType - Return an ObjCQualifiedIdType for the 'id' decl
+/// and the conforming protocol list.
 QualType ASTContext::getObjCQualifiedIdType(QualType idType,
                                             ObjCProtocolDecl **Protocols, 
                                             unsigned NumProtocols) {
+  // Sort the protocol list alphabetically to canonicalize it.
+  SortAndUniqueProtocols(Protocols, NumProtocols);
+
   llvm::FoldingSetNodeID ID;
   ObjCQualifiedIdType::Profile(ID, Protocols, NumProtocols);
   

lib/Parse/ParseObjc.cpp

@@ -701,18 +701,11 @@ Parser::DeclTy *Parser::ParseObjCMethodDecl(SourceLocation mLoc,
                                         MethodImplKind, isVariadic);
 }
 
-/// CmpProtocolVals - Comparison predicate for sorting protocols.
-static bool CmpProtocolVals(const IdentifierInfo* const& lhs,
-                            const IdentifierInfo* const& rhs) {
-  return strcmp(lhs->getName(), rhs->getName()) < 0;
-}
-
 ///   objc-protocol-refs:
 ///     '<' identifier-list '>'
 ///
 bool Parser::ParseObjCProtocolReferences(
-  llvm::SmallVectorImpl<IdentifierInfo*> &ProtocolRefs, SourceLocation &endLoc) 
-{
+  llvm::SmallVectorImpl<IdentifierInfo*> &ProtocolRefs, SourceLocation &endLoc){
   assert(Tok.is(tok::less) && "expected <");
   
   ConsumeToken(); // the "<"
@@ -731,13 +724,6 @@ bool Parser::ParseObjCProtocolReferences(
     ConsumeToken();
   }
   
-  // Sort protocols, keyed by name.
-  // Later on, we remove duplicates.
-  std::stable_sort(ProtocolRefs.begin(), ProtocolRefs.end(), CmpProtocolVals);
-  
-  // Make protocol names unique.
-  ProtocolRefs.erase(std::unique(ProtocolRefs.begin(), ProtocolRefs.end()), 
-                     ProtocolRefs.end());
   // Consume the '>'.
   if (Tok.is(tok::greater)) {
     endLoc = ConsumeAnyToken();