File:  [gforth] / gforth / debug.fs
Revision 1.22: download - view: text, annotated - select for diffs
Sun Mar 9 15:16:47 2003 UTC (16 years, 8 months ago) by anton
Branches: MAIN
CVS tags: v0-6-1, v0-6-0, HEAD
updated copyright years

    1: \ DEBUG.FS     Debugger                                12jun93jaw
    2: 
    3: \ Copyright (C) 1995,1996,1997,2000,2003 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: require see.fs
   22: 
   23: decimal
   24: 
   25: VARIABLE dbg-ip     \ instruction pointer for debugger
   26: 
   27: \ !! move to see?
   28: 
   29: : save-see-flags ( -- n* cnt )
   30:   C-Output @
   31:   C-Formated @ 1 ;
   32: 
   33: : restore-see-flags ( n* cnt -- )
   34:   drop C-Formated !
   35:   C-Output ! ;
   36: 
   37: : scanword ( body -- )
   38:         >r save-see-flags r>
   39:         c-init C-Output off
   40:         ScanMode c-pass !
   41:         dup MakePass
   42:         0 Level !
   43:         0 XPos !
   44:         DisplayMode c-pass !
   45:         MakePass
   46:         restore-see-flags ;
   47: 
   48: : .n    0 <# # # # # #S #> ctype bl cemit ;
   49: 
   50: : d.s   ." [ " depth . ." ] "
   51:         depth 4 min dup 0 ?DO dup i - pick .n LOOP drop ;
   52: 
   53: : NoFine        XPos off YPos off
   54:                 NLFlag off Level off
   55:                 C-Formated off
   56:                 ;
   57: 
   58: : Leave-D ;
   59: 
   60: : disp-step ( -- )
   61: \ display step at current dbg-ip
   62:         DisplayMode c-pass !            \ change to displaymode
   63:         cr
   64:         c-stop off
   65:         Base @ hex dbg-ip @ 8 u.r space dbg-ip @ @ 8 u.r space
   66:         Base !
   67:         save-see-flags
   68:         NoFine 10 XPos !
   69:         dbg-ip @ DisplayMode c-pass ! Analyse drop
   70:         25 XPos @ - 0 max spaces ." -> " 
   71:         restore-see-flags ;
   72: 
   73: : get-next ( -- n | n n )
   74:         DebugMode c-pass !
   75:         dbg-ip @ Analyse ;
   76: 
   77: : jump          ( addr -- )
   78:                 r> drop \ discard last ip
   79:                 >r ;
   80: 
   81: AVARIABLE DebugLoop
   82: 
   83: : breaker      r> 1 cells - dbg-ip ! DebugLoop @ jump ;
   84: 
   85: CREATE BP 0 , 0 ,
   86: CREATE DT 0 , 0 ,
   87: 
   88: : set-bp        ( 0 n | 0 n n -- )
   89:                 0. BP 2!
   90:                 ?dup IF dup BP ! dup @ DT !
   91:                         ['] Breaker swap !
   92:                         ?dup IF dup BP cell+ ! dup @ DT cell+ !
   93:                                 ['] Breaker swap ! drop THEN
   94:                      THEN ;
   95: 
   96: : restore-bp    ( -- )
   97:                 BP @ ?dup IF DT @ swap ! THEN
   98:                 BP cell+ @ ?dup IF DT cell+ @ swap ! THEN ;
   99: 
  100: VARIABLE Body
  101: 
  102: : nestXT-checkSpecial ( xt -- xt2 | cfa xt2 ) 
  103:   dup >does-code IF
  104:     \ if nest into a does> we must leave
  105:     \ the body address on stack as does> does...
  106:     dup >body swap EXIT
  107:   THEN
  108:   dup ['] EXECUTE = IF   
  109:     \ xt to EXECUTE is next stack item...
  110:     drop EXIT 
  111:   THEN
  112:   dup ['] PERFORM = IF
  113:     \ xt to EXECUTE is addressed by next stack item
  114:     drop @ EXIT 
  115:   THEN
  116:   BEGIN
  117:     dup >code-address dodefer: =
  118:     WHILE
  119:       \ load xt of DEFERed word
  120:       cr ." nesting defered..." 
  121:       >body @    
  122:   REPEAT ;
  123: 
  124: : nestXT ( xt -- true | body false )
  125: \G return true if we are not able to debug this, 
  126: \G body and false otherwise
  127:   nestXT-checkSpecial 
  128:   \ scan code with xt-see
  129:   DebugMode c-pass ! C-Output off
  130:   xt-see C-Output on
  131:   c-pass @ DebugMode = dup
  132:   IF      cr ." Cannot debug!!"
  133:   THEN ;
  134: 
  135: VARIABLE Nesting
  136: 
  137: VARIABLE Unnest
  138: 
  139: : D-KEY         ( -- flag )
  140:         BEGIN
  141:                 Unnest @ IF 0 ELSE key THEN
  142:                 CASE    [char] n OF     dbg-ip @ @ nestXT EXIT ENDOF
  143:                         [char] s OF     Leave-D
  144:                                         -128 THROW ENDOF
  145:                         [char] a OF     Leave-D
  146:                                         -128 THROW ENDOF
  147:                         [char] d OF     Leave-D
  148:                                         cr ." Done..." cr
  149:                                         Nesting off
  150:                                         r> drop dbg-ip @ >r
  151:                                         EXIT ENDOF
  152:                         [char] ? OF     cr ." Nest Stop Done Unnest" cr
  153:                                         ENDOF
  154:                         [char] u OF     Unnest on true EXIT ENDOF
  155:                         drop true EXIT
  156:                 ENDCASE
  157:         AGAIN ;
  158: 
  159: : (_debug) ( body ip -- )
  160:         0 Nesting !
  161:         BEGIN   Unnest off
  162:                 cr ." Scanning code..." cr C-Formated on
  163:                 swap scanword dbg-ip !
  164:                 cr ." Nesting debugger ready!" cr
  165:                 BEGIN   d.s disp-step D-Key
  166:                 WHILE   C-Stop @ 0=
  167:                 WHILE   0 get-next set-bp
  168:                         dbg-ip @ jump
  169:                         [ here DebugLoop ! ]
  170:                         restore-bp
  171:                 REPEAT
  172:                 Nesting @ 0= IF EXIT THEN
  173:                 -1 Nesting +! r>
  174:                 ELSE
  175:                 dbg-ip @ 1 cells + >r 1 Nesting +!
  176:                 THEN
  177:                 dup
  178:         AGAIN ;
  179: 
  180: : (debug) dup (_debug) ;
  181: 
  182: : dbg ( "name" -- ) \ gforth 
  183:     ' NestXT IF EXIT THEN (debug) Leave-D ;
  184: 
  185: : break:, ( -- )
  186:   lastxt postpone literal ;
  187: 
  188: : (break:)
  189:     r> ['] (_debug) >body >r ;
  190:   
  191: : break: ( -- ) \ gforth
  192:     break:, postpone (break:) ; immediate
  193: 
  194: : (break")
  195:     cr
  196:     ." BREAK AT: " type cr
  197:     r> ['] (_debug) >body >r ;
  198: 
  199: : break" ( 'ccc"' -- ) \ gforth
  200:     break:,
  201:     postpone s"
  202:     postpone (break") ; immediate

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