================
@@ -0,0 +1,38 @@
+//===----- ABIInfo.h - ABI information access & encapsulation ----- C++ 
---===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// ABI information access & encapsulation
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ABI_ABIINFO_H
+#define LLVM_ABI_ABIINFO_H
+
+#include "llvm/ABI/ABIFunctionInfo.h"
+#include "llvm/ABI/Types.h"
+#include <cassert>
+
+namespace llvm {
+namespace abi {
+
+/// Abstract base class for target-specific ABI information.
+class ABIInfo {
+public:
+  virtual ~ABIInfo() = default;
+
+  virtual ABIArgInfo classifyReturnType(const Type *RetTy) const = 0;
+  virtual ABIArgInfo classifyArgumentType(const Type *ArgTy) const = 0;
+  virtual void computeInfo(ABIFunctionInfo &FI) const;
----------------
vortex73 wrote:

ah must've forgotten to add an `= 0` at the end there. 

https://github.com/llvm/llvm-project/pull/140112
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