Encode Class, SEL and Objective-C objects.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@43540 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/AST/ASTContext.cpp b/AST/ASTContext.cpp
index 93ec288..ec7cd7b 100644
--- a/AST/ASTContext.cpp
+++ b/AST/ASTContext.cpp
@@ -152,6 +152,9 @@
   BuiltinVaListType = QualType();
   ObjcIdType = QualType();
   IdStructType = 0;
+  ObjcClassType = QualType();
+  ClassStructType = 0;
+  
   ObjcConstantStringType = QualType();
   
   // void * type
@@ -1008,9 +1011,15 @@
     S += encoding;
   } else if (const PointerType *PT = T->getAsPointerType()) {
     QualType PointeeTy = PT->getPointeeType();
-    if (isObjcIdType(PointeeTy)) {
+    if (isObjcIdType(PointeeTy) || PointeeTy->isObjcInterfaceType()) {
       S += '@';
       return;
+    } else if (isObjcClassType(PointeeTy)) {
+      S += '#';
+      return;
+    } else if (isObjcSelType(PointeeTy)) {
+      S += ':';
+      return;
     }
     
     if (PointeeTy->isCharType()) {
@@ -1086,6 +1095,20 @@
   ProtoStructType = TD->getUnderlyingType()->getAsStructureType();
 }
 
+void ASTContext::setObjcClassType(TypedefDecl *TD)
+{
+  assert(ObjcClassType.isNull() && "'Class' type already set!");
+    
+  ObjcClassType = getTypedefType(TD);
+
+  // typedef struct objc_class *Class;
+  const PointerType *ptr = TD->getUnderlyingType()->getAsPointerType();
+  assert(ptr && "'Class' incorrectly typed");
+  const RecordType *rec = ptr->getPointeeType()->getAsStructureType();
+  assert(rec && "'Class' incorrectly typed");
+  ClassStructType = rec;
+}
+
 void ASTContext::setObjcConstantStringInterface(ObjcInterfaceDecl *Decl) {
   assert(ObjcConstantStringType.isNull() && 
          "'NSConstantString' type already set!");