[llvm] yaml2obj: Implement Coverage mapping format (PR #129472)

[Jessica Paquette via llvm-commits]

================
@@ -0,0 +1,211 @@
+//===- CovMap.h - ObjectYAML Interface for coverage map ---------*- 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
+//
+//===----------------------------------------------------------------------===//
+//
+// - llvm::coverage::yaml
+//
+//   Describes binary file formats and YAML structures of coverage map.
+//
+// - llvm::yaml
+//
+//   Attachments for YAMLTraits.
+//
+// - llvm::covmap
+//
+//   Provides YAML encoder for coverage map.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_OBJECTYAML_COVMAP_H
+#define LLVM_OBJECTYAML_COVMAP_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ObjectYAML/ELFYAML.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/YAMLTraits.h"
+#include <array>
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace llvm {
+class raw_ostream;
+} // namespace llvm
+
+namespace llvm::coverage::yaml {
+
+/// Base Counter, corresponding to coverage::Counter.
+struct CounterTy {
+  enum TagTy : uint8_t {
----------------
ornata wrote:

Would it make more sense to call this "OpTy" or something?

https://github.com/llvm/llvm-project/pull/129472