#include <timevar.h>

Data Fields
uint64_t	user

uint64_t	sys

uint64_t	wall

size_t	ggc_mem

Detailed Description

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 nanoseconds.  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.