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basic profiling infrastructure

    1: \ count execution of control-flow edges
    2: 
    3: \ Copyright (C) 2004 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: 
   22: \ relies on some Gforth internals
   23: 
   24: \ !! assumption: each file is included only once; otherwise you get
   25: \ the counts for just one of the instances of the file.  This can be
   26: \ fixed by making sure that every source position occurs only once as
   27: \ a profile point.
   28: 
   29: struct
   30:     cell%    field profile-next
   31:     cell% 2* field profile-count
   32:     cell% 2* field profile-sourcepos
   33:     cell%    field profile-char \ character position in line
   34: end-struct profile% \ profile point
   35: 
   36: variable profile-points \ linked list of profile%
   37: 0 profile-points !
   38: 
   39: : new-profile-point ( -- addr )
   40:     profile% %alloc >r
   41:     0. r@ profile-count 2!
   42:     current-sourcepos r@ profile-sourcepos 2!
   43:     >in @ r@ profile-char !
   44:     profile-points @ r@ profile-next !
   45:     r@ profile-points !
   46:     r> ;
   47: 
   48: : dinc ( d-addr -- )
   49:     \ increment double pointed to by d-addr
   50:     dup 2@ 1. d+ rot 2! ;
   51: 
   52: : profile-this ( -- )
   53:     new-profile-point profile-count POSTPONE literal POSTPONE dinc ;
   54: 
   55: : profile-:-hook ( -- )
   56:     defers :-hook profile-this ;
   57: 
   58: : print-profile ( -- )
   59:     profile-points @ begin
   60: 	dup while
   61: 	    dup >r
   62: 	    r@ profile-sourcepos 2@ .sourcepos ." :"
   63: 	    r@ profile-char @ 0 .r ." : "
   64: 	    r@ profile-count 2@ 0 d.r cr
   65: 	    r> profile-next @
   66:     repeat
   67:     drop ;
   68: 
   69: ' profile-:-hook is :-hook