CodeGen: simplify using a local variable, NFC

Add a couple of local variables for the class interface and the super class
interface.  This allows for the repeated access of the information to be cached
and makes the code simpler to understand.  NFC.

llvm-svn: 275696

diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 09d1ceb..f6773fa 100644 (file)
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -5991,8 +5991,7 @@ void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
           CGM.getModule(), ObjCTypes.ImpnfABITy, false,
           llvm::GlobalValue::ExternalLinkage, nullptr, "_objc_empty_vtable");
   }
-  assert(ID->getClassInterface() &&
-         "CGObjCNonFragileABIMac::GenerateClass - class is 0");
+
   // FIXME: Is this correct (that meta class size is never computed)?
   uint32_t InstanceStart =
     CGM.getDataLayout().getTypeAllocSize(ObjCTypes.ClassnfABITy);
@@ -6004,9 +6003,11 @@ void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
 
   llvm::GlobalVariable *SuperClassGV, *IsAGV;
 
+  const auto *CI = ID->getClassInterface();
+  assert(CI && "CGObjCNonFragileABIMac::GenerateClass - class is 0");
+
   // Build the flags for the metaclass.
-  bool classIsHidden =
-    ID->getClassInterface()->getVisibility() == HiddenVisibility;
+  bool classIsHidden = CI->getVisibility() == HiddenVisibility;
   if (classIsHidden)
     flags |= NonFragileABI_Class_Hidden;
 
@@ -6018,42 +6019,43 @@ void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
       flags |= NonFragileABI_Class_HasCXXDestructorOnly;  
   }
 
-  if (!ID->getClassInterface()->getSuperClass()) {
+  if (!CI->getSuperClass()) {
     // class is root
     flags |= NonFragileABI_Class_Root;
+
     TClassName = ObjCClassName;
     TClassName += ClassName;
-    SuperClassGV = GetClassGlobal(TClassName.str(),
-                                  ID->getClassInterface()->isWeakImported());
+    SuperClassGV = GetClassGlobal(TClassName.str(), CI->isWeakImported());
+
     TClassName = ObjCMetaClassName;
     TClassName += ClassName;
-    IsAGV = GetClassGlobal(TClassName.str(),
-                           ID->getClassInterface()->isWeakImported());
+    IsAGV = GetClassGlobal(TClassName.str(), CI->isWeakImported());
   } else {
     // Has a root. Current class is not a root.
     const ObjCInterfaceDecl *Root = ID->getClassInterface();
     while (const ObjCInterfaceDecl *Super = Root->getSuperClass())
       Root = Super;
+
+    const auto *Super = CI->getSuperClass();
+
     TClassName = ObjCMetaClassName ;
     TClassName += Root->getObjCRuntimeNameAsString();
-    IsAGV = GetClassGlobal(TClassName.str(),
-                           Root->isWeakImported());
+    IsAGV = GetClassGlobal(TClassName.str(), Root->isWeakImported());
 
     // work on super class metadata symbol.
     TClassName = ObjCMetaClassName;
-    TClassName += ID->getClassInterface()->getSuperClass()->getObjCRuntimeNameAsString();
-    SuperClassGV = GetClassGlobal(
-                                  TClassName.str(),
-                                  ID->getClassInterface()->getSuperClass()->isWeakImported());
-  }
-  llvm::GlobalVariable *CLASS_RO_GV = BuildClassRoTInitializer(flags,
-                                                               InstanceStart,
-                                                               InstanceSize,ID);
+    TClassName += Super->getObjCRuntimeNameAsString();
+    SuperClassGV = GetClassGlobal(TClassName.str(), Super->isWeakImported());
+  }
+
+  llvm::GlobalVariable *CLASS_RO_GV =
+      BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
+
   TClassName = ObjCMetaClassName;
   TClassName += ClassName;
-  llvm::GlobalVariable *MetaTClass = BuildClassMetaData(
-      TClassName.str(), IsAGV, SuperClassGV, CLASS_RO_GV, classIsHidden,
-      ID->getClassInterface()->isWeakImported());
+  llvm::GlobalVariable *MetaTClass =
+      BuildClassMetaData(TClassName.str(), IsAGV, SuperClassGV, CLASS_RO_GV,
+                         classIsHidden, CI->isWeakImported());
   DefinedMetaClasses.push_back(MetaTClass);
 
   // Metadata for the class
@@ -6074,34 +6076,32 @@ void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
       flags |= NonFragileABI_Class_HasCXXDestructorOnly;
   }
 
-  if (hasObjCExceptionAttribute(CGM.getContext(), ID->getClassInterface()))
+  if (hasObjCExceptionAttribute(CGM.getContext(), CI))
     flags |= NonFragileABI_Class_Exception;
 
-  if (!ID->getClassInterface()->getSuperClass()) {
+  if (!CI->getSuperClass()) {
     flags |= NonFragileABI_Class_Root;
     SuperClassGV = nullptr;
   } else {
     // Has a root. Current class is not a root.
+    const auto *Super = CI->getSuperClass();
+
     TClassName = ObjCClassName;
-    TClassName += ID->getClassInterface()->getSuperClass()->getObjCRuntimeNameAsString();
-    SuperClassGV = GetClassGlobal(
-                                  TClassName.str(),
-                                  ID->getClassInterface()->getSuperClass()->isWeakImported());
+    TClassName += Super->getObjCRuntimeNameAsString();
+    SuperClassGV = GetClassGlobal(TClassName.str(), Super->isWeakImported());
   }
+
   GetClassSizeInfo(ID, InstanceStart, InstanceSize);
-  CLASS_RO_GV = BuildClassRoTInitializer(flags,
-                                         InstanceStart,
-                                         InstanceSize,
-                                         ID);
+  CLASS_RO_GV =
+      BuildClassRoTInitializer(flags, InstanceStart, InstanceSize, ID);
 
   TClassName = ObjCClassName;
   TClassName += ClassName;
   llvm::GlobalVariable *ClassMD =
     BuildClassMetaData(TClassName.str(), MetaTClass, SuperClassGV, CLASS_RO_GV,
-                       classIsHidden,
-                       ID->getClassInterface()->isWeakImported());
+                       classIsHidden, CI->isWeakImported());
   DefinedClasses.push_back(ClassMD);
-  ImplementedClasses.push_back(ID->getClassInterface());
+  ImplementedClasses.push_back(CI);
 
   // Determine if this class is also "non-lazy".
   if (ImplementationIsNonLazy(ID))
@@ -6109,7 +6109,7 @@ void CGObjCNonFragileABIMac::GenerateClass(const ObjCImplementationDecl *ID) {
 
   // Force the definition of the EHType if necessary.
   if (flags & NonFragileABI_Class_Exception)
-    GetInterfaceEHType(ID->getClassInterface(), true);
+    GetInterfaceEHType(CI, true);
   // Make sure method definition entries are all clear for next implementation.
   MethodDefinitions.clear();
 }