[llvm] [SYCL] Add property set types and JSON representation (PR #147321)

[Justin Cai via llvm-commits]

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@@ -0,0 +1,33 @@
+///===- llvm/Frontend/Offloading/PropertySet.h ----------------------------===//
+//
+// 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 This file defines PropertySetRegistry and PropertyValue types and
+/// provides helper functions to translate PropertySetRegistry from/to JSON.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Error.h"
+
+#include <map>
+#include <variant>
+
+namespace llvm {
+class raw_ostream;
+class MemoryBufferRef;
+
+namespace offloading {
+
+using ByteArray = SmallVector<unsigned char, 0>;
+using PropertyValue = std::variant<uint32_t, ByteArray>;
+using PropertySet = std::map<std::string, PropertyValue>;
+using PropertySetRegistry = std::map<std::string, PropertySet>;
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jzc wrote:

Like remove from them from the .h? These types appear in the signatures of `readPropertiesFromJSON`/`writePropertiesFromJSON`, so I don't think I should

https://github.com/llvm/llvm-project/pull/147321