[CIR] Refactor VoidPtr constraint to CIR_VoidPtrType (#138859)

This mirrors incubator changes from llvm/clangir#1601

Author: xlauko

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

@@ -141,4 +141,37 @@ def CIR_AnyIntOrFloatType : AnyTypeOf<[CIR_AnyFloatType, CIR_AnyIntType],
     let cppFunctionName = "isAnyIntegerOrFloatingPointType";
 }
 
+//===----------------------------------------------------------------------===//
+// Pointer Type predicates
+//===----------------------------------------------------------------------===//
+
+def CIR_AnyPtrType : CIR_TypeBase<"::cir::PointerType", "pointer type">;
+
+// Pointer to type constraint bases
+class CIR_IsPtrToPred<code type> : CPred<"$_self.isPtrTo<" # type # ">()">;
+
+class CIR_PtrTo<code type, string summary>
+    : CIR_ConfinedType<CIR_AnyPtrType, [CIR_IsPtrToPred<type>],
+        "pointer to " # summary>;
+
+// Pointer to pointer constraint bases
+class CIR_IsPtrToPtrToPred<code type>
+    : CPred<"$_self.isPtrToPtrTo<" # type # ">()">;
+
+class CIR_PtrToPtrTo<code type, string summary>
+    : CIR_ConfinedType<CIR_AnyPtrType, [CIR_IsPtrToPtrToPred<type>],
+        "pointer to pointer to " # summary>;
+
+// Void pointer type constraints
+def CIR_VoidPtrType
+    : CIR_PtrTo<"::cir::VoidType", "void type">,
+      BuildableType<"$_builder.getType<" # cppType # ">("
+        "cir::VoidType::get($_builder.getContext()))">;
+
+def CIR_PtrToVoidPtrType
+    : CIR_PtrToPtrTo<"::cir::VoidType", "void type">,
+      BuildableType<"$_builder.getType<" # cppType # ">("
+        "$_builder.getType<" # cppType # ">("
+        "cir::VoidType::get($_builder.getContext())))">;
+
 #endif // CLANG_CIR_DIALECT_IR_CIRTYPECONSTRAINTS_TD

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

@@ -197,8 +197,30 @@ def CIR_PointerType : CIR_Type<"Pointer", "ptr",
   let skipDefaultBuilders = 1;
 
   let extraClassDeclaration = [{
+    template <typename ...Types>
+    bool isPtrTo() const {
+      return mlir::isa< Types... >(getPointee());
+    }
+
     bool isVoidPtr() const {
-      return mlir::isa<cir::VoidType>(getPointee());
+      return isPtrTo<cir::VoidType>();
+    }
+
+    template <typename ...Types>
+    bool isPtrToPtrTo() const {
+      if (auto ptrType = mlir::dyn_cast<cir::PointerType>(getPointee()))
+        return ptrType.isPtrTo<Types...>();
+      return false;
+    }
+
+    bool isPtrTo(mlir::Type type) const {
+      return getPointee() == type;
+    }
+
+    bool isPtrToPtrTo(mlir::Type type) const {
+      if (auto ptrType = mlir::dyn_cast<cir::PointerType>(getPointee()))
+        return ptrType.isPtrTo(type);
+      return false;
     }
   }];
 }
@@ -368,20 +390,6 @@ def CIR_VoidType : CIR_Type<"Void", "void"> {
   }];
 }
 
-// Constraints
-
-// Pointer to void
-def VoidPtr : Type<
-    And<[
-      CPred<"::mlir::isa<::cir::PointerType>($_self)">,
-      CPred<"::mlir::isa<::cir::VoidType>("
-            "::mlir::cast<::cir::PointerType>($_self).getPointee())">,
-    ]>, "void*">,
-    BuildableType<
-      "cir::PointerType::get($_builder.getContext(),"
-      "cir::VoidType::get($_builder.getContext()))"> {
-}
-
 //===----------------------------------------------------------------------===//
 // RecordType
 //