flags.h.svn-base

Google浏览器V8内核代码

// Copyright 2006-2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
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//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//
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#ifndef V8_FLAGS_H_
#define V8_FLAGS_H_

#include "checks.h"

namespace v8 { namespace internal {

// Declare all of our flags.
#define FLAG_MODE_DECLARE
#include "flag-definitions.h"

// The global list of all flags.
class FlagList {
 public:
  // The list of all flags with a value different from the default
  // and their values. The format of the list is like the format of the
  // argv array passed to the main function, e.g.
  // ("--prof", "--log-file", "v8.prof", "--nolazy").
  //
  // The caller is responsible for disposing the list.
  static List<char *>* argv();

  // Set the flag values by parsing the command line. If remove_flags is
  // set, the flags and associated values are removed from (argc,
  // argv). Returns 0 if no error occurred. Otherwise, returns the argv
  // index > 0 for the argument where an error occurred. In that case,
  // (argc, argv) will remain unchanged indepdendent of the remove_flags
  // value, and no assumptions about flag settings should be made.
  //
  // The following syntax for flags is accepted (both '-' and '--' are ok):
  //
  //   --flag        (bool flags only)
  //   --noflag      (bool flags only)
  //   --flag=value  (non-bool flags only, no spaces around '=')
  //   --flag value  (non-bool flags only)
  static int SetFlagsFromCommandLine(int* argc, char** argv, bool remove_flags);

  // Set the flag values by parsing the string str. Splits string into argc
  // substrings argv[], each of which consisting of non-white-space chars,
  // and then calls SetFlagsFromCommandLine() and returns its result.
  static int SetFlagsFromString(const char* str, int len);

  // Reset all flags to their default value.
  static void ResetAllFlags();

  // Print help to stdout with flags, types, and default values.
  static void PrintHelp();
};

} }  // namespace v8::internal

#endif  // V8_FLAGS_H_