gcc/timevar.h

   1 /* Timing variables for measuring compiler performance.
   2    Copyright (C) 2000-2014 Free Software Foundation, Inc.
   3    Contributed by Alex Samuel <samuel@codesourcery.com>
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT
  13    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  15    License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GCC; see the file COPYING3.  If not see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_TIMEVAR_H
  22 #define GCC_TIMEVAR_H
  23
  24 /* Timing variables are used to measure elapsed time in various
  25    portions of the compiler.  Each measures elapsed user, system, and
  26    wall-clock time, as appropriate to and supported by the host
  27    system.
  28
  29    Timing variables are defined using the DEFTIMEVAR macro in
  30    timevar.def.  Each has an enumeral identifier, used when referring
  31    to the timing variable in code, and a character string name.
  32
  33    Timing variables can be used in two ways:
  34
  35      - On the timing stack, using timevar_push and timevar_pop.
  36        Timing variables may be pushed onto the stack; elapsed time is
  37        attributed to the topmost timing variable on the stack.  When
  38        another variable is pushed on, the previous topmost variable is
  39        `paused' until the pushed variable is popped back off.
  40
  41      - As a standalone timer, using timevar_start and timevar_stop.
  42        All time elapsed between the two calls is attributed to the
  43        variable.
  44 */
  45
  46 /* This structure stores the various varieties of time that can be
  47    measured.  Times are stored in seconds.  The time may be an
  48    absolute time or a time difference; in the former case, the time
  49    base is undefined, except that the difference between two times
  50    produces a valid time difference.  */
  51
  52 struct timevar_time_def
  53 {
  54   /* User time in this process.  */
  55   double user;
  56
  57   /* System time (if applicable for this host platform) in this
  58      process.  */
  59   double sys;
  60
  61   /* Wall clock time.  */
  62   double wall;
  63
  64   /* Garbage collector memory.  */
  65   size_t ggc_mem;
  66 };
  67
  68 /* An enumeration of timing variable identifiers.  Constructed from
  69    the contents of timevar.def.  */
  70
  71 #define DEFTIMEVAR(identifier__, name__) \
  72     identifier__,
  73 typedef enum
  74 {
  75   TV_NONE,
  76 #include "timevar.def"
  77   TIMEVAR_LAST
  78 }
  79 timevar_id_t;
  80 #undef DEFTIMEVAR
  81
  82 /* True if timevars should be used.  In GCC, this happens with
  83    the -ftime-report flag.  */
  84 extern bool timevar_enable;
  85
  86 /* Total amount of memory allocated by garbage collector.  */
  87 extern size_t timevar_ggc_mem_total;
  88
  89 extern void timevar_init (void);
  90 extern void timevar_push_1 (timevar_id_t);
  91 extern void timevar_pop_1 (timevar_id_t);
  92 extern void timevar_start (timevar_id_t);
  93 extern void timevar_stop (timevar_id_t);
  94 extern bool timevar_cond_start (timevar_id_t);
  95 extern void timevar_cond_stop (timevar_id_t, bool);
  96 extern void timevar_print (FILE *);
  97
  98 /* Provided for backward compatibility.  */
  99 static inline void
 100 timevar_push (timevar_id_t tv)
 101 {
 102   if (timevar_enable)
 103     timevar_push_1 (tv);
 104 }
 105
 106 static inline void
 107 timevar_pop (timevar_id_t tv)
 108 {
 109   if (timevar_enable)
 110     timevar_pop_1 (tv);
 111 }
 112
 113 // This is a simple timevar wrapper class that pushes a timevar in its
 114 // constructor and pops the timevar in its destructor.
 115 class auto_timevar
 116 {
 117  public:
 118   auto_timevar (timevar_id_t tv)
 119     : m_tv (tv)
 120   {
 121     timevar_push (m_tv);
 122   }
 123
 124   ~auto_timevar ()
 125   {
 126     timevar_pop (m_tv);
 127   }
 128
 129  private:
 130
 131   // Private to disallow copies.
 132   auto_timevar (const auto_timevar &);
 133
 134   timevar_id_t m_tv;
 135 };
 136
 137 extern void print_time (const char *, long);
 138
 139 #endif /* ! GCC_TIMEVAR_H */