\ report stack depth changes in source code in various (optional) ways
\ Copyright (C) 2004 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth 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/.
\ Use this program like this:
\ include it, then the program you want to check
\ e.g., start it with
\ gforth depth-changes.fs myprog.fs
\ By default this will report stack depth changes at every empty line
\ in interpret state. You can vary this by using
\ gforth depth-changes.fs -e "' <word> IS depth-changes-filter" myprog.fs
\ with the following values for <word>:
\ <word> meaning
\ all-lines every line in interpret state
\ most-lines every line in interpret state not ending with "\"
defer depth-changes-filter ( -- f )
\G true if the line should be checked for depth changes
: all-lines ( -- f )
state @ 0= ;
: empty-lines ( -- f )
source (parse-white) nip 0= all-lines and ;
: most-lines ( -- f )
source dup if
1- chars + c@ '\ <>
all-lines and ;
' empty-lines is depth-changes-filter
: check-line ( -- )
sp@ fp@ last-depths 2@
2over last-depths 2!
['] ~~ execute
sp@ fp@ last-depths 2!
' check-line is line-end-hook