[clang] [CIR] Add CXX special member attribute to cir::FuncOp (PR #167975)

[Henrich Lauko via cfe-commits]

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@@ -822,6 +822,104 @@ def CIR_GlobalDtorAttr : CIR_GlobalCtorDtor<"Dtor", "dtor"> {
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// CXX SpecialMemberAttr
+//===----------------------------------------------------------------------===//
+
+def CIR_CtorKind : CIR_I32EnumAttr<"CtorKind", "CXX Constructor Kind", [
+  I32EnumAttrCase<"Custom", 0, "custom">,
+  I32EnumAttrCase<"Default", 1, "default">,
+  I32EnumAttrCase<"Copy", 2, "copy">,
+  I32EnumAttrCase<"Move", 3, "move">,
+]> {
+  let genSpecializedAttr = 0;
+}
+
+def CIR_CXXCtorAttr : CIR_Attr<"CXXCtor", "cxx_ctor"> {
+  let summary = "Marks a function as a CXX constructor";
+  let description = [{
+    Functions with this attribute are CXX constructors.
+    The `custom` kind is used if the constructor is a custom constructor.
+    The `default` kind is used if the constructor is a default constructor.
+    The `copy` kind is used if the constructor is a copy constructor.
+    The `move` kind is used if the constructor is a move constructor.
+  }];
+  let parameters = (ins "mlir::Type":$type,
+                        EnumParameter<CIR_CtorKind>:$ctorKind,
+                        "bool":$is_trivial);
+
+  let assemblyFormat = [{
+    `<` $type `,` $ctorKind `,` $is_trivial `>`
----------------
xlauko wrote:

Only `#cir.cxx_ctor<!rec_Something, kind, trivial>` but yes :) It creates a prefix using dialect name and attribute mnemonic (`cir.cxx_ctor`) and concatenates it with assembly format.

https://github.com/llvm/llvm-project/pull/167975