[llvm] [utils][TableGen] Handle versions on clause/directive spellings (PR #143021)

[Krzysztof Parzyszek via llvm-commits]

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@@ -0,0 +1,39 @@
+//===-- Spelling.h ------------------------------------------------ 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
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_FRONTEND_DIRECTIVE_SPELLING_H
+#define LLVM_FRONTEND_DIRECTIVE_SPELLING_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator_range.h"
+
+#include <limits>
+
+namespace llvm::directive {
+
+struct VersionRange {
+  static constexpr int MaxValue = std::numeric_limits<int>::max();
+  int Min = 1;
+  int Max = MaxValue;
+};
+
+inline bool operator<(const VersionRange &A, const VersionRange &B) {
+  if (A.Min != B.Min)
+    return A.Min < B.Min;
+  return A.Max < B.Max;
+}
+
+struct Spelling {
+  StringRef Name;
+  VersionRange Versions;
+};
+
+StringRef FindName(llvm::iterator_range<const Spelling *>, unsigned Version);
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kparzysz wrote:

There is an unwritten convention to qualify STL-like names (usually from STLExtras.h, but iterator_range.h also uses STL-line names).

https://github.com/llvm/llvm-project/pull/143021