[CIR] Rename cir.struct to cir.record and associated changes (llvm#1559)

During the initial upstreaming of `cir.struct` support, a request was
made to rename `cir.struct` to `cir.record` for consistency with its
multiple uses. This change makes the modification along with renaming
various other related classes. I've attempted to also update variable
names and comments to keep everything consistent.

This creates an unfortunate name collision between cir::RecordType and
clang::RecordType, but the impact of that overlaps was relatively small.

The only intended behavioral change is in the names used in the emitted
CIR files and diagnostics.

Author: andykaylor

clang/include/clang/CIR/Dialect/Builder/CIRBaseBuilder.h

@@ -143,8 +143,8 @@ class CIRBaseBuilderTy : public mlir::OpBuilder {
       return getZeroAttr(arrTy);
     if (auto ptrTy = mlir::dyn_cast<cir::PointerType>(ty))
       return getConstNullPtrAttr(ptrTy);
-    if (auto structTy = mlir::dyn_cast<cir::StructType>(ty))
-      return getZeroAttr(structTy);
+    if (auto RecordTy = mlir::dyn_cast<cir::RecordType>(ty))
+      return getZeroAttr(RecordTy);
     if (auto methodTy = mlir::dyn_cast<cir::MethodType>(ty))
       return getNullMethodAttr(methodTy);
     if (mlir::isa<cir::BoolType>(ty)) {
@@ -496,16 +496,16 @@ class CIRBaseBuilderTy : public mlir::OpBuilder {
     return createCast(cir::CastKind::int_to_ptr, src, newTy);
   }
 
-  mlir::Value createGetMemberOp(mlir::Location &loc, mlir::Value structPtr,
+  mlir::Value createGetMemberOp(mlir::Location &loc, mlir::Value recordPtr,
                                 const char *fldName, unsigned idx) {
 
-    assert(mlir::isa<cir::PointerType>(structPtr.getType()));
-    auto structBaseTy =
-        mlir::cast<cir::PointerType>(structPtr.getType()).getPointee();
-    assert(mlir::isa<cir::StructType>(structBaseTy));
-    auto fldTy = mlir::cast<cir::StructType>(structBaseTy).getMembers()[idx];
+    assert(mlir::isa<cir::PointerType>(recordPtr.getType()));
+    auto recordBaseTy =
+        mlir::cast<cir::PointerType>(recordPtr.getType()).getPointee();
+    assert(mlir::isa<cir::RecordType>(recordBaseTy));
+    auto fldTy = mlir::cast<cir::RecordType>(recordBaseTy).getMembers()[idx];
     auto fldPtrTy = cir::PointerType::get(getContext(), fldTy);
-    return create<cir::GetMemberOp>(loc, fldPtrTy, structPtr, fldName, idx);
+    return create<cir::GetMemberOp>(loc, fldPtrTy, recordPtr, fldName, idx);
   }
 
   mlir::Value createPtrToInt(mlir::Value src, mlir::Type newTy) {

clang/include/clang/CIR/Dialect/IR/CIRAttrs.h

@@ -37,7 +37,7 @@ class RecordDecl;
 
 namespace cir {
 class ArrayType;
-class StructType;
+class RecordType;
 class BoolType;
 } // namespace cir
 

clang/include/clang/CIR/Dialect/IR/CIRAttrs.td

@@ -331,37 +331,37 @@ def ConstVectorAttr : CIR_Attr<"ConstVector", "const_vector",
 }
 
 //===----------------------------------------------------------------------===//
-// ConstStructAttr
+// ConstRecordAttr
 //===----------------------------------------------------------------------===//
 
-def ConstStructAttr : CIR_Attr<"ConstStruct", "const_struct",
+def ConstRecordAttr : CIR_Attr<"ConstRecord", "const_record",
                                [TypedAttrInterface]> {
-  let summary = "Represents a constant struct";
+  let summary = "Represents a constant record";
   let description = [{
     Effectively supports "struct-like" constants. It's must be built from
     an `mlir::ArrayAttr `instance where each elements is a typed attribute
     (`mlir::TypedAttribute`).
 
     Example:
     ```
-    cir.global external @rgb2 = #cir.const_struct<{0 : i8,
+    cir.global external @rgb2 = #cir.const_record<{0 : i8,
                                                    5 : i64, #cir.null : !cir.ptr<i8>
-                                                  }> : !cir.struct<"", i8, i64, !cir.ptr<i8>>
+                                                  }> : !cir.record<"", i8, i64, !cir.ptr<i8>>
     ```
   }];
 
   let parameters = (ins AttributeSelfTypeParameter<"">:$type,
                         "mlir::ArrayAttr":$members);
 
   let builders = [
-    AttrBuilderWithInferredContext<(ins "cir::StructType":$type,
+    AttrBuilderWithInferredContext<(ins "cir::RecordType":$type,
                                         "mlir::ArrayAttr":$members), [{
       return $_get(type.getContext(), type, members);
     }]>
   ];
 
   let assemblyFormat = [{
-    `<` custom<StructMembers>($members) `>`
+    `<` custom<RecordMembers>($members) `>`
   }];
 
   let genVerifyDecl = 1;
@@ -576,7 +576,7 @@ def DataMemberAttr : CIR_Attr<"DataMember", "data_member",
     pointer-to-data-member value.
 
     The `member_index` parameter represents the index of the pointed-to member
-    within its containing struct. It is an optional parameter; lack of this
+    within its containing record. It is an optional parameter; lack of this
     parameter indicates a null pointer-to-data-member value.
 
     Example:
@@ -687,7 +687,7 @@ def GlobalViewAttr : CIR_Attr<"GlobalView", "global_view", [TypedAttrInterface]>
 
     A list of indices can be optionally passed and each element subsequently
     indexes underlying types. For `symbol` types like `!cir.array`
-    and `!cir.struct`, it leads to the constant address of sub-elements, while
+    and `!cir.record`, it leads to the constant address of sub-elements, while
     for `!cir.ptr`, an offset is applied. The first index is relative to the
     original symbol type, not the produced one.
 
@@ -764,9 +764,9 @@ def TypeInfoAttr : CIR_Attr<"TypeInfo", "typeinfo", [TypedAttrInterface]> {
     layout is determined by the C++ ABI used (clang only implements
     itanium on CIRGen).
 
-    The verifier enforces that the output type is always a `!cir.struct`,
+    The verifier enforces that the output type is always a `!cir.record`,
     and that the ArrayAttr element types match the equivalent member type
-    for the resulting struct, i.e, a GlobalViewAttr for symbol reference or
+    for the resulting record, i.e, a GlobalViewAttr for symbol reference or
     an IntAttr for flags.
 
     Example:
@@ -776,7 +776,7 @@ def TypeInfoAttr : CIR_Attr<"TypeInfo", "typeinfo", [TypedAttrInterface]> {
 
     cir.global external @type_info_B = #cir.typeinfo<<
       {#cir.global_view<@_ZTVN10__cxxabiv120__si_class_type_infoE, [2]> : !cir.ptr<i8>}
-    >> : !cir.struct<"", !cir.ptr<i8>>
+    >> : !cir.record<"", !cir.ptr<i8>>
     ```
   }];
 
@@ -790,11 +790,11 @@ def TypeInfoAttr : CIR_Attr<"TypeInfo", "typeinfo", [TypedAttrInterface]> {
     }]>
   ];
 
-  // Checks struct element types should match the array for every equivalent
+  // Checks record element types should match the array for every equivalent
   // element type.
   let genVerifyDecl = 1;
   let assemblyFormat = [{
-    `<` custom<StructMembers>($data) `>`
+    `<` custom<RecordMembers>($data) `>`
   }];
 }
 
@@ -805,7 +805,7 @@ def TypeInfoAttr : CIR_Attr<"TypeInfo", "typeinfo", [TypedAttrInterface]> {
 def VTableAttr : CIR_Attr<"VTable", "vtable", [TypedAttrInterface]> {
   let summary = "Represents a C++ vtable";
   let description = [{
-    Wraps a #cir.const_struct containing vtable data.
+    Wraps a #cir.const_record containing vtable data.
 
     Example:
     ```
@@ -816,11 +816,11 @@ def VTableAttr : CIR_Attr<"VTable", "vtable", [TypedAttrInterface]> {
          #cir.global_view<@_ZN1BD0Ev> : !cir.ptr<i8>,
          #cir.global_view<@_ZNK1A5quackEv> : !cir.ptr<i8>]>
          : !cir.array<!cir.ptr<i8> x 5>}>>
-      : !cir.struct<"", !cir.array<!cir.ptr<i8> x 5>>
+      : !cir.record<"", !cir.array<!cir.ptr<i8> x 5>>
     ```
   }];
 
-  // `vtable_data` is const struct with one element, containing an array of
+  // `vtable_data` is const record with one element, containing an array of
   // vtable information.
   let parameters = (ins AttributeSelfTypeParameter<"">:$type,
                         "mlir::ArrayAttr":$vtable_data);
@@ -834,21 +834,21 @@ def VTableAttr : CIR_Attr<"VTable", "vtable", [TypedAttrInterface]> {
 
   let genVerifyDecl = 1;
   let assemblyFormat = [{
-    `<` custom<StructMembers>($vtable_data) `>`
+    `<` custom<RecordMembers>($vtable_data) `>`
   }];
 }
 
 //===----------------------------------------------------------------------===//
-// StructLayoutAttr
+// RecordLayoutAttr
 //===----------------------------------------------------------------------===//
 
-// Used to decouple layout information from the struct type. StructType's
+// Used to decouple layout information from the record type. RecordType's
 // uses this attribute to cache that information.
 
-def StructLayoutAttr : CIR_Attr<"StructLayout", "struct_layout"> {
-  let summary = "ABI specific information about a struct layout";
+def RecordLayoutAttr : CIR_Attr<"RecordLayout", "record_layout"> {
+  let summary = "ABI specific information about a record layout";
   let description = [{
-    Holds layout information often queried by !cir.struct users
+    Holds layout information often queried by !cir.record users
     during lowering passes and optimizations.
   }];
 
@@ -888,7 +888,7 @@ def DynamicCastInfoAttr
     Provide ABI specific information about a dynamic cast operation.
 
     The `srcRtti` and the `destRtti` parameters give the RTTI of the source
-    struct type and the destination struct type, respectively.
+    record type and the destination record type, respectively.
 
     The `runtimeFunc` parameter gives the `__dynamic_cast` function which is
     provided by the runtime. The `badCastFunc` parameter gives the

clang/include/clang/CIR/Dialect/IR/CIRDataLayout.h

@@ -22,7 +22,7 @@
 
 namespace cir {
 
-class StructLayout;
+class RecordLayout;
 
 // FIXME(cir): This might be replaced by a CIRDataLayout interface which can
 // provide the same functionalities.
@@ -31,9 +31,9 @@ class CIRDataLayout {
 
   /// Primitive type alignment data. This is sorted by type and bit
   /// width during construction.
-  llvm::DataLayout::PrimitiveSpec StructAlignment;
+  llvm::DataLayout::PrimitiveSpec RecordAlignment;
 
-  // The StructType -> StructLayout map.
+  // The RecordType -> RecordLayout map.
   mutable void *LayoutMap = nullptr;
 
   TypeSizeInfoAttr typeSizeInfo;
@@ -52,11 +52,11 @@ class CIRDataLayout {
 
   bool isBigEndian() const { return bigEndian; }
 
-  /// Returns a StructLayout object, indicating the alignment of the
-  /// struct, its size, and the offsets of its fields.
+  /// Returns a RecordLayout object, indicating the alignment of the
+  /// record, its size, and the offsets of its fields.
   ///
   /// Note that this information is lazily cached.
-  const StructLayout *getStructLayout(cir::StructType Ty) const;
+  const RecordLayout *getRecordLayout(cir::RecordType Ty) const;
 
   /// Internal helper method that returns requested alignment for type.
   llvm::Align getAlignment(mlir::Type Ty, bool abiOrPref) const;
@@ -121,21 +121,21 @@ class CIRDataLayout {
 
 /// Used to lazily calculate structure layout information for a target machine,
 /// based on the DataLayout structure.
-class StructLayout final
-    : public llvm::TrailingObjects<StructLayout, llvm::TypeSize> {
-  llvm::TypeSize StructSize;
-  llvm::Align StructAlignment;
+class RecordLayout final
+    : public llvm::TrailingObjects<RecordLayout, llvm::TypeSize> {
+  llvm::TypeSize RecordSize;
+  llvm::Align RecordAlignment;
   unsigned IsPadded : 1;
   unsigned NumElements : 31;
 
 public:
-  llvm::TypeSize getSizeInBytes() const { return StructSize; }
+  llvm::TypeSize getSizeInBytes() const { return RecordSize; }
 
-  llvm::TypeSize getSizeInBits() const { return 8 * StructSize; }
+  llvm::TypeSize getSizeInBits() const { return 8 * RecordSize; }
 
-  llvm::Align getAlignment() const { return StructAlignment; }
+  llvm::Align getAlignment() const { return RecordAlignment; }
 
-  /// Returns whether the struct has padding or not between its fields.
+  /// Returns whether the record has padding or not between its fields.
   /// NB: Padding in nested element is not taken into account.
   bool hasPadding() const { return IsPadded; }
 
@@ -164,7 +164,7 @@ class StructLayout final
 private:
   friend class CIRDataLayout; // Only DataLayout can create this class
 
-  StructLayout(cir::StructType ST, const CIRDataLayout &DL);
+  RecordLayout(cir::RecordType ST, const CIRDataLayout &DL);
 
   size_t numTrailingObjects(OverloadToken<llvm::TypeSize>) const {
     return NumElements;