[CIR] Make ClangIR compatible with latest nested name specifier AST representation (#152846)

After AST representation, new modifications landed in
(llvm/llvm-project#147835). ClangIR requires
some changes in how we use Clang AST to be compatible with the new
changes

Author: AmrDeveloper

clang/lib/CIR/CodeGen/CIRGenCall.cpp

@@ -42,17 +42,17 @@ CIRGenFunctionInfo::create(CanQualType resultType,
   return fi;
 }
 
-cir::FuncType CIRGenTypes::getFunctionType(const CIRGenFunctionInfo &fi) {
-  mlir::Type resultType = convertType(fi.getReturnType());
+cir::FuncType CIRGenTypes::getFunctionType(const CIRGenFunctionInfo &info) {
+  mlir::Type resultType = convertType(info.getReturnType());
   SmallVector<mlir::Type, 8> argTypes;
-  argTypes.reserve(fi.getNumRequiredArgs());
+  argTypes.reserve(info.getNumRequiredArgs());
 
-  for (const CanQualType &argType : fi.requiredArguments())
+  for (const CanQualType &argType : info.requiredArguments())
     argTypes.push_back(convertType(argType));
 
   return cir::FuncType::get(argTypes,
                             (resultType ? resultType : builder.getVoidTy()),
-                            fi.isVariadic());
+                            info.isVariadic());
 }
 
 CIRGenCallee CIRGenCallee::prepareConcreteCallee(CIRGenFunction &cgf) const {

clang/lib/CIR/CodeGen/CIRGenExpr.cpp

@@ -1169,7 +1169,8 @@ static void pushTemporaryCleanup(CIRGenFunction &cgf,
                                         ->getBaseElementTypeUnsafe()
                                         ->getAs<clang::RecordType>()) {
     // Get the destructor for the reference temporary.
-    auto *classDecl = cast<CXXRecordDecl>(rt->getOriginalDecl());
+    auto *classDecl =
+        cast<CXXRecordDecl>(rt->getOriginalDecl()->getDefinitionOrSelf());
     if (!classDecl->hasTrivialDestructor())
       referenceTemporaryDtor =
           classDecl->getDefinitionOrSelf()->getDestructor();

clang/lib/CIR/CodeGen/CIRGenFunction.cpp

@@ -356,8 +356,8 @@ static bool mayDropFunctionReturn(const ASTContext &astContext,
   // destructor or a non-trivially copyable type.
   if (const RecordType *recordType =
           returnType.getCanonicalType()->getAs<RecordType>()) {
-    if (const auto *classDecl =
-            dyn_cast<CXXRecordDecl>(recordType->getOriginalDecl()))
+    if (const auto *classDecl = dyn_cast<CXXRecordDecl>(
+            recordType->getOriginalDecl()->getDefinitionOrSelf()))
       return classDecl->hasTrivialDestructor();
   }
   return returnType.isTriviallyCopyableType(astContext);

clang/lib/CIR/CodeGen/CIRGenTypes.cpp

@@ -139,6 +139,8 @@ isSafeToConvert(const RecordDecl *rd, CIRGenTypes &cgt,
   if (!alreadyChecked.insert(rd).second)
     return true;
 
+  assert(rd->isCompleteDefinition() &&
+         "Expect RecordDecl to be CompleteDefinition");
   const Type *key = cgt.getASTContext().getCanonicalTagType(rd).getTypePtr();
 
   // If this type is already laid out, converting it is a noop.

clang/lib/CIR/CodeGen/TargetInfo.cpp

@@ -17,13 +17,13 @@ bool clang::CIRGen::isEmptyRecordForLayout(const ASTContext &context,
     if (cxxrd->isDynamicClass())
       return false;
 
-    for (const auto &I : cxxrd->bases())
-      if (!isEmptyRecordForLayout(context, I.getType()))
+    for (const auto &i : cxxrd->bases())
+      if (!isEmptyRecordForLayout(context, i.getType()))
         return false;
   }
 
-  for (const auto *I : rd->fields())
-    if (!isEmptyFieldForLayout(context, I))
+  for (const auto *i : rd->fields())
+    if (!isEmptyFieldForLayout(context, i))
       return false;
 
   return true;