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  1. //===- HotnessThresholdParser.h - Parser for hotness threshold --*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8. ///
  9. /// \file
  10. /// This file implements a simple parser to decode commandline option for
  11. /// remarks hotness threshold that supports both int and a special 'auto' value.
  12. ///
  13. //===----------------------------------------------------------------------===//
  14.  
  15. #ifndef LLVM_REMARKS_HOTNESSTHRESHOLDPARSER_H
  16. #define LLVM_REMARKS_HOTNESSTHRESHOLDPARSER_H
  17.  
  18. #include "llvm/Support/CommandLine.h"
  19. #include <optional>
  20.  
  21. namespace llvm {
  22. namespace remarks {
  23.  
  24. // Parse remarks hotness threshold argument value.
  25. // Valid option values are
  26. // 1. integer: manually specified threshold; or
  27. // 2. string 'auto': automatically get threshold from profile summary.
  28. //
  29. // Return std::nullopt Optional if 'auto' is specified, indicating the value
  30. // will be filled later during PSI.
  31. inline Expected<std::optional<uint64_t>> parseHotnessThresholdOption(StringRef Arg) {
  32.   if (Arg == "auto")
  33.     return std::nullopt;
  34.  
  35.   int64_t Val;
  36.   if (Arg.getAsInteger(10, Val))
  37.     return createStringError(llvm::inconvertibleErrorCode(),
  38.                              "Not an integer: %s", Arg.data());
  39.  
  40.   // Negative integer effectively means no threshold
  41.   return Val < 0 ? 0 : Val;
  42. }
  43.  
  44. // A simple CL parser for '*-remarks-hotness-threshold='
  45. class HotnessThresholdParser : public cl::parser<std::optional<uint64_t>> {
  46. public:
  47.   HotnessThresholdParser(cl::Option &O) : cl::parser<std::optional<uint64_t>>(O) {}
  48.  
  49.   bool parse(cl::Option &O, StringRef ArgName, StringRef Arg,
  50.              std::optional<uint64_t> &V) {
  51.     auto ResultOrErr = parseHotnessThresholdOption(Arg);
  52.     if (!ResultOrErr)
  53.       return O.error("Invalid argument '" + Arg +
  54.                      "', only integer or 'auto' is supported.");
  55.  
  56.     V = *ResultOrErr;
  57.     return false;
  58.   }
  59. };
  60.  
  61. } // namespace remarks
  62. } // namespace llvm
  63. #endif // LLVM_REMARKS_HOTNESSTHRESHOLDPARSER_H
  64.