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[gforth] /
gforth /
debug.fs
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1.14:
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Fri Dec 3 18:28:58 1999 UTC (24 years, 4 months ago) by
crook
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documentation tweaks plus a bug-fix: a recent change to this file meant
that break: and break: were only available in the cross-compiler
environment. I think that this *should* have been coded so that these
two words were *never* available in the cross-compiler environment
-- if I'm wrong, humble apologies (and please explain why..)
\ DEBUG.FS Debugger 12jun93jaw
\ Copyright (C) 1995,1996,1997 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 2
\ 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, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
decimal
VARIABLE dbg-ip \ instruction pointer for debugger
: scanword ( body -- )
c-init C-Output off
ScanMode c-pass !
dup MakePass
0 Level !
0 XPos !
DisplayMode c-pass !
MakePass
C-Output on ;
: .n 0 <# # # # # #S #> ctype bl cemit ;
: d.s ." [ " depth . ." ] "
depth 4 min dup 0 ?DO dup i - pick .n LOOP drop ;
: NoFine XPos off YPos off
NLFlag off Level off
C-Formated off
;
: disp-step
DisplayMode c-pass ! \ change to displaymode
cr
c-stop off
Base @ hex dbg-ip @ 8 u.r space dbg-ip @ @ 8 u.r space
Base !
NoFine 10 XPos !
dbg-ip @ DisplayMode c-pass ! Analyse drop
25 XPos @ - 0 max spaces ." -> " ;
: get-next ( -- n | n n )
DebugMode c-pass !
dbg-ip @ Analyse ;
: jump ( addr -- )
r> drop \ discard last ip
>r ;
AVARIABLE DebugLoop
: breaker r> 1 cells - dbg-ip ! DebugLoop @ jump ;
CREATE BP 0 , 0 ,
CREATE DT 0 , 0 ,
: set-bp ( 0 n | 0 n n -- )
0. BP 2!
?dup IF dup BP ! dup @ DT !
['] Breaker swap !
?dup IF dup BP cell+ ! dup @ DT cell+ !
['] Breaker swap ! drop THEN
THEN ;
: restore-bp ( -- )
BP @ ?dup IF DT @ swap ! THEN
BP cell+ @ ?dup IF DT cell+ @ swap ! THEN ;
VARIABLE Body
: NestXT ( xt -- true | body false )
\ special deal for create does> words
\ leaves body address on the stack
dup >does-code IF dup >body swap THEN
DebugMode c-pass ! C-Output off
xt-see C-Output on
c-pass @ DebugMode = dup
IF ." Cannot debug" cr
THEN ;
VARIABLE Nesting
: Leave-D
C-Formated on
C-Output on ;
VARIABLE Unnest
: D-KEY ( -- flag )
BEGIN
Unnest @ IF 0 ELSE key THEN
CASE [char] n OF dbg-ip @ @ NestXT EXIT ENDOF
[char] s OF Leave-D
-128 THROW ENDOF
[char] a OF Leave-D
-128 THROW ENDOF
[char] d OF Leave-D
cr ." Done..." cr
Nesting off
r> drop dbg-ip @ >r
EXIT ENDOF
[char] ? OF cr ." Nest Stop Done Unnest" cr
ENDOF
[char] u OF Unnest on true EXIT ENDOF
drop true EXIT
ENDCASE
AGAIN ;
: (debug) ( body -- )
0 Nesting !
BEGIN Unnest off
cr ." Scanning code..." cr C-Formated on
dup scanword dbg-ip !
cr ." Nesting debugger ready!" cr
BEGIN d.s disp-step D-Key
WHILE C-Stop @ 0=
WHILE 0 get-next set-bp
dbg-ip @ jump
[ here DebugLoop ! ]
restore-bp
REPEAT
Nesting @ 0= IF EXIT THEN
-1 Nesting +! r>
ELSE
dbg-ip @ 1 cells + >r 1 Nesting +!
THEN
AGAIN ;
: dbg ( "name" -- ) \ gforth
' NestXT IF EXIT THEN (debug) Leave-D ;
has? compiler invert [IF] \ nac bugfix
: break: ( -- ) \ gforth
r> ['] (debug) >body >r ;
: (break")
cr
." BREAK AT: " type cr
r> ['] (debug) >body >r ;
: break" ( 'ccc"' -- ) \ gforth
postpone s"
postpone (break") ; immediate
[THEN]
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