llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.h

//===-- sanitizer_flag_parser.h ---------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
//
//===----------------------------------------------------------------------===//

#ifndef SANITIZER_FLAG_REGISTRY_H
#define SANITIZER_FLAG_REGISTRY_H

#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
#include "sanitizer_common.h"

namespace __sanitizer {

class FlagHandlerBase {
 public:
  virtual bool Parse(const char *value) { return false; }
};

template <typename T>
class FlagHandler : public FlagHandlerBase {
  T *t_;

 public:
  explicit FlagHandler(T *t) : t_(t) {}
  bool Parse(const char *value) final;
};

template <>
inline bool FlagHandler<bool>::Parse(const char *value) {
  if (internal_strcmp(value, "0") == 0 ||
      internal_strcmp(value, "no") == 0 ||
      internal_strcmp(value, "false") == 0) {
    *t_ = false;
    return true;
  }
  if (internal_strcmp(value, "1") == 0 ||
      internal_strcmp(value, "yes") == 0 ||
      internal_strcmp(value, "true") == 0) {
    *t_ = true;
    return true;
  }
  Printf("ERROR: Invalid value for bool option: '%s'\n", value);
  return false;
}

template <>
inline bool FlagHandler<const char *>::Parse(const char *value) {
  *t_ = internal_strdup(value);
  return true;
}

template <>
inline bool FlagHandler<int>::Parse(const char *value) {
  char *value_end;
  *t_ = internal_simple_strtoll(value, &value_end, 10);
  bool ok = *value_end == 0;
  if (!ok) Printf("ERROR: Invalid value for int option: '%s'\n", value);
  return ok;
}

template <>
inline bool FlagHandler<uptr>::Parse(const char *value) {
  char *value_end;
  *t_ = internal_simple_strtoll(value, &value_end, 10);
  bool ok = *value_end == 0;
  if (!ok) Printf("ERROR: Invalid value for uptr option: '%s'\n", value);
  return ok;
}

class FlagParser {
  static const int kMaxFlags = 200;
  struct Flag {
    const char *name;
    const char *desc;
    FlagHandlerBase *handler;
  } *flags_;
  int n_flags_;

  const char *buf_;
  uptr pos_;

 public:
  FlagParser();
  void RegisterHandler(const char *name, FlagHandlerBase *handler,
                       const char *desc);
  void ParseString(const char *s);
  bool ParseFile(const char *path, bool ignore_missing);
  void PrintFlagDescriptions();

  static LowLevelAllocator Alloc;

 private:
  void fatal_error(const char *err);
  bool is_space(char c);
  void skip_whitespace();
  void parse_flags();
  void parse_flag();
  bool run_handler(const char *name, const char *value);
  char *ll_strndup(const char *s, uptr n);
};

template <typename T>
static void RegisterFlag(FlagParser *parser, const char *name, const char *desc,
                         T *var) {
  FlagHandler<T> *fh = new (FlagParser::Alloc) FlagHandler<T>(var);  // NOLINT
  parser->RegisterHandler(name, fh, desc);
}

void ReportUnrecognizedFlags();

}  // namespace __sanitizer

#endif  // SANITIZER_FLAG_REGISTRY_H