[llvm] [SYCL][LLVM] Adding property set I/O library for SYCL (PR #110771)

[Arvind Sudarsanam via llvm-commits]

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+//=- SYCLPropertySetIO.h -- models a sequence of property sets and their I/O =//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+// Models a sequence of property sets and their input and output operations.
+// SYCLPropertyValue set format:
+//   '['<SYCLPropertyValue set name>']'
+//   <property name>=<property type>'|'<property value>
+//   <property name>=<property type>'|'<property value>
+//   ...
+//   '['<SYCLPropertyValue set name>']'
+//   <property name>=<property type>'|'<property value>
+// where
+//   <SYCLPropertyValue set name>, <property name> are strings
+//   <property type> - string representation of the property type
+//   <property value> - string representation of the property value.
+//
+// For example:
+// [Staff/Ages]
+// person1=1|20
+// person2=1|25
+// [Staff/Experience]
+// person1=1|1
+// person2=1|2
+// person3=1|12
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_SYCLPROPERTYSETIO_H
+#define LLVM_SUPPORT_SYCLPROPERTYSETIO_H
+
+#include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/xxhash.h"
+#include <variant>
+
+namespace llvm {
+namespace util {
+
+// Represents a SYCL property value. SYCLPropertyValue name is stored in the
+// encompassing container.
+class SYCLPropertyValue {
+public:
+  // Type of the size of the value. Value size gets serialized along with the
+  // value data in some cases for later reading at runtime, so size_t is not
+  // suitable as its size varies.
+  using SizeTy = uint64_t;
+
+  // Defines supported property types
+  enum Type { first = 0, NONE = first, UINT32, BYTE_ARRAY, last = BYTE_ARRAY };
+
+  // Translates C++ type to the corresponding type tag.
+  template <typename T> static Type getTypeTag();
+
+  // Casts from int value to a type tag.
+  static Expected<Type> getTypeTag(int T) {
+    if (T < first || T > last)
+      return createStringError(std::error_code(), "bad property type ", T);
+    return static_cast<Type>(T);
+  }
+
+  ~SYCLPropertyValue() {}
+
+  SYCLPropertyValue() = default;
+  SYCLPropertyValue(Type T) : Ty(T) {}
+
+  SYCLPropertyValue(uint32_t Val) : Ty(UINT32), Val({Val}) {}
+  SYCLPropertyValue(const std::byte *Data, SizeTy DataBitSize);
+  template <typename C, typename T = typename C::value_type>
+  SYCLPropertyValue(const C &Data)
+      : SYCLPropertyValue(reinterpret_cast<const std::byte *>(Data.data()),
+                          Data.size() * sizeof(T) * CHAR_BIT) {}
+  SYCLPropertyValue(const llvm::StringRef &Str)
+      : SYCLPropertyValue(reinterpret_cast<const std::byte *>(Str.data()),
+                          Str.size() * sizeof(char) *
+                              /* bits in one byte */ 8) {}
+  SYCLPropertyValue(const SYCLPropertyValue &P);
+  SYCLPropertyValue(SYCLPropertyValue &&P);
+
+  SYCLPropertyValue &operator=(SYCLPropertyValue &&P);
+
+  SYCLPropertyValue &operator=(const SYCLPropertyValue &P);
+
+  // Get property value as unsigned 32-bit integer
+  uint32_t asUint32() const {
+    if (Ty != UINT32)
+      llvm_unreachable("must be UINT32 value");
----------------
asudarsa wrote:

Addressed in 4de315891600364fe4798361e3177625afc542b8

Thanks

https://github.com/llvm/llvm-project/pull/110771