[llvm] [StaticDataLayout][PGO] Add profile format for static data layout, and the classes to operate on the profiles. (PR #138170)

[David Li via llvm-commits]

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+//===- DataAccessProf.h - Data access profile format support ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support to construct and use data access profiles.
+//
+// For the original RFC of this pass please see
+// https://discourse.llvm.org/t/rfc-profile-guided-static-data-partitioning/83744
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_PROFILEDATA_DATAACCESSPROF_H_
+#define LLVM_PROFILEDATA_DATAACCESSPROF_H_
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/DenseMapInfoVariant.h"
+#include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ProfileData/InstrProf.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/StringSaver.h"
+
+#include <cstdint>
+#include <variant>
+
+namespace llvm {
+
+namespace data_access_prof {
+// The location of data in the source code.
+struct DataLocation {
+  // The filename where the data is located.
+  StringRef FileName;
+  // The line number in the source code.
+  uint32_t Line;
+};
+
+// The data access profiles for a symbol.
+struct DataAccessProfRecord {
+  // Represents a data symbol. The semantic comes in two forms: a symbol index
+  // for symbol name if `IsStringLiteral` is false, or the hash of a string
+  // content if `IsStringLiteral` is true. Required.
+  uint64_t SymbolID;
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david-xl wrote:

SG

https://github.com/llvm/llvm-project/pull/138170