doc: reformat grammar snippets.

[bison.git] / lib / timevar.h

/* Timing variables for measuring compiler performance.

   Copyright (C) 2000, 2002, 2004, 2009-2012 Free Software Foundation,
   Inc.

   Contributed by Alex Samuel <samuel@codesourcery.com>

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef GCC_TIMEVAR_H
#define GCC_TIMEVAR_H

/* Timing variables are used to measure elapsed time in various
   portions of the compiler.  Each measures elapsed user, system, and
   wall-clock time, as appropriate to and supported by the host
   system.

   Timing variables are defined using the DEFTIMEVAR macro in
   timevar.def.  Each has an enumeral identifier, used when referring
   to the timing variable in code, and a character string name.

   Timing variables can be used in two ways:

     - On the timing stack, using timevar_push and timevar_pop.
       Timing variables may be pushed onto the stack; elapsed time is
       attributed to the topmost timing variable on the stack.  When
       another variable is pushed on, the previous topmost variable is
       `paused' until the pushed variable is popped back off.

     - As a standalone timer, using timevar_start and timevar_stop.
       All time elapsed between the two calls is attributed to the
       variable.
*/

/* This structure stores the various varieties of time that can be
   measured.  Times are stored in seconds.  The time may be an
   absolute time or a time difference; in the former case, the time
   base is undefined, except that the difference between two times
   produces a valid time difference.  */

struct timevar_time_def
{
  /* User time in this process.  */
  float user;

  /* System time (if applicable for this host platform) in this
     process.  */
  float sys;

  /* Wall clock time.  */
  float wall;
};

/* An enumeration of timing variable identifiers.  Constructed from
   the contents of timevar.def.  */

#define DEFTIMEVAR(identifier__, name__) \
    identifier__,
typedef enum
{
#include "timevar.def"
  TIMEVAR_LAST
}
timevar_id_t;
#undef DEFTIMEVAR

extern void init_timevar (void);
extern void timevar_push (timevar_id_t);
extern void timevar_pop (timevar_id_t);
extern void timevar_start (timevar_id_t);
extern void timevar_stop (timevar_id_t);
extern void timevar_get (timevar_id_t, struct timevar_time_def *);
extern void timevar_print (FILE *);

/* Provided for backward compatibility.  */
extern long get_run_time (void);
extern void print_time (const char *, long);

extern int timevar_report;

#endif /* ! GCC_TIMEVAR_H */