File:  [gforth] / gforth / see.fs
Revision 1.61: download - view: text, annotated - select for diffs
Sat Sep 29 22:20:02 2007 UTC (13 years, 7 months ago) by pazsan
Branches: MAIN
CVS tags: HEAD
Constants compile to literals

    1: \ SEE.FS       highend SEE for ANSforth                16may93jaw
    2: 
    3: \ Copyright (C) 1995,2000,2003,2004,2006 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: \ May be cross-compiled
   23: 
   24: \ I'm sorry. This is really not "forthy" enough.
   25: 
   26: \ Ideas:        Level should be a stack
   27: 
   28: require look.fs
   29: require termsize.fs
   30: require wordinfo.fs
   31: 
   32: decimal
   33: 
   34: \ Screen format words                                   16may93jaw
   35: 
   36: VARIABLE C-Output   1 C-Output  !
   37: VARIABLE C-Formated 1 C-Formated !
   38: VARIABLE C-Highlight 0 C-Highlight !
   39: VARIABLE C-Clearline 0 C-Clearline !
   40: 
   41: VARIABLE XPos
   42: VARIABLE YPos
   43: VARIABLE Level
   44: 
   45: : Format        C-Formated @ C-Output @ and
   46:                 IF dup spaces XPos +! ELSE drop THEN ;
   47: 
   48: : level+        7 Level +!
   49:                 Level @ XPos @ -
   50:                 dup 0> IF Format ELSE drop THEN ;
   51: 
   52: : level-        -7 Level +! ;
   53: 
   54: VARIABLE nlflag
   55: VARIABLE uppercase	\ structure words are in uppercase
   56: 
   57: DEFER nlcount ' noop IS nlcount
   58: 
   59: : nl            nlflag on ;
   60: : (nl)          nlcount
   61:                 XPos @ Level @ = IF EXIT THEN \ ?Exit
   62:                 C-Formated @ IF
   63:                 C-Output @
   64:                 IF C-Clearline @ IF cols XPos @ - spaces
   65:                                  ELSE cr THEN
   66:                 1 YPos +! 0 XPos !
   67:                 Level @ spaces
   68:                 THEN Level @ XPos ! THEN ;
   69: 
   70: : warp?         ( len -- len )
   71:                 nlflag @ IF (nl) nlflag off THEN
   72:                 XPos @ over + cols u>= IF (nl) THEN ;
   73: 
   74: : ctype         ( adr len -- )
   75:                 warp? dup XPos +! C-Output @ 
   76: 		IF uppercase @ IF bounds ?DO i c@ toupper emit LOOP
   77: 				  uppercase off ELSE type THEN
   78: 		ELSE 2drop THEN ;
   79: 
   80: : cemit         1 warp?
   81:                 over bl = Level @ XPos @ = and
   82:                 IF 2drop ELSE XPos +! C-Output @ IF emit ELSE drop THEN
   83:                 THEN ;
   84: 
   85: DEFER .string ( c-addr u n -- )
   86: 
   87: [IFDEF] Green
   88: VARIABLE Colors Colors on
   89: 
   90: : (.string)     ( c-addr u n -- )
   91:                 over warp? drop
   92:                 Colors @
   93:                 IF C-Highlight @ ?dup
   94:                    IF   CT@ swap CT@ or
   95:                    ELSE CT@
   96:                    THEN
   97:                 attr! ELSE drop THEN
   98:                 ctype  ct @ attr! ;
   99: [ELSE]
  100: : (.string)     ( c-addr u n -- )
  101:                 drop ctype ;
  102: [THEN]
  103: 
  104: ' (.string) IS .string
  105: 
  106: : c-\type ( c-addr u -- )
  107:     \ type string in \-escaped form
  108:     begin
  109: 	dup while
  110: 	    2dup newline string-prefix? if
  111: 		'\ cemit 'n cemit
  112: 		newline nip /string
  113: 	    else
  114: 		over c@
  115: 		dup '" = over '\ = or if
  116: 		    '\ cemit cemit
  117: 		else
  118: 		    dup bl 127 within if
  119: 			cemit
  120: 		    else
  121: 			base @ >r try
  122: 			    8 base ! 0 <<# # # # '\ hold #> ctype #>> 0
  123: 			restore
  124: 			    r@ base !
  125: 			endtry
  126: 			rdrop throw
  127: 		    endif
  128: 		endif
  129: 		1 /string
  130: 	    endif
  131:     repeat
  132:     2drop ;
  133: 
  134: : .struc        
  135: 	uppercase on Str# .string ;
  136: 
  137: \ CODES (Branchtypes)                                    15may93jaw
  138: 
  139: 21 CONSTANT RepeatCode
  140: 22 CONSTANT AgainCode
  141: 23 CONSTANT UntilCode
  142: \ 09 CONSTANT WhileCode
  143: 10 CONSTANT ElseCode
  144: 11 CONSTANT AheadCode
  145: 13 CONSTANT WhileCode2
  146: 14 CONSTANT Disable
  147: 15 CONSTANT LeaveCode
  148: 
  149: 
  150: \ FORMAT WORDS                                          13jun93jaw
  151: 
  152: VARIABLE C-Stop
  153: VARIABLE Branches
  154: 
  155: VARIABLE BranchPointer	\ point to the end of branch table
  156: VARIABLE SearchPointer
  157: 
  158: \ The branchtable consists of three entrys:
  159: \ address of branch , branch destination , branch type
  160: 
  161: CREATE BranchTable 128 cells allot
  162: here 3 cells -
  163: ACONSTANT MaxTable
  164: 
  165: : FirstBranch BranchTable cell+ SearchPointer ! ;
  166: 
  167: : (BranchAddr?) ( a-addr1 -- a-addr2 true | false )
  168: \ searches a branch with destination a-addr1
  169: \ a-addr1: branch destination
  170: \ a-addr2: pointer in branch table
  171:         SearchPointer @
  172:         BEGIN   dup BranchPointer @ u<
  173:         WHILE
  174:                 dup @ 2 pick <>
  175:         WHILE   3 cells +
  176:         REPEAT
  177:         nip dup  3 cells + SearchPointer ! true
  178:         ELSE
  179:         2drop false
  180:         THEN ;
  181: 
  182: : BranchAddr?
  183:         FirstBranch (BranchAddr?) ;
  184: 
  185: ' (BranchAddr?) ALIAS MoreBranchAddr?
  186: 
  187: : CheckEnd ( a-addr -- true | false )
  188:         BranchTable cell+
  189:         BEGIN   dup BranchPointer @ u<
  190:         WHILE
  191:                 dup @ 2 pick u<=
  192:         WHILE   3 cells +
  193:         REPEAT
  194:         2drop false
  195:         ELSE
  196:         2drop true
  197:         THEN ;
  198: 
  199: : MyBranch      ( a-addr -- a-addr a-addr2 )
  200: \ finds branch table entry for branch at a-addr
  201:                 dup @
  202:                 BranchAddr?
  203:                 BEGIN
  204:                 WHILE 1 cells - @
  205:                       over <>
  206:                 WHILE dup @
  207:                       MoreBranchAddr?
  208:                 REPEAT
  209:                 SearchPointer @ 3 cells -
  210:                 ELSE    true ABORT" SEE: Table failure"
  211:                 THEN ;
  212: 
  213: \
  214: \                 addrw               addrt
  215: \       BEGIN ... WHILE ... AGAIN ... THEN
  216: \         ^         !        !          ^
  217: \         ----------+--------+          !
  218: \                   !                   !
  219: \                   +-------------------+
  220: \
  221: \
  222: 
  223: : CheckWhile ( a-addrw a-addrt -- true | false )
  224:         BranchTable
  225:         BEGIN   dup BranchPointer @ u<
  226:         WHILE   dup @ 3 pick u>
  227:                 over @ 3 pick u< and
  228:                 IF dup cell+ @ 3 pick u<
  229:                         IF 2drop drop true EXIT THEN
  230:                 THEN
  231:                 3 cells +
  232:         REPEAT
  233:         2drop drop false ;
  234: 
  235: : ,Branch ( a-addr -- )
  236:         BranchPointer @ dup MaxTable u> ABORT" SEE: Table overflow"
  237:         !
  238:         1 cells BranchPointer +! ;
  239: 
  240: : Type!   ( u -- )
  241:         BranchPointer @ 1 cells - ! ;
  242: 
  243: : Branch! ( a-addr rel -- a-addr )
  244:     over ,Branch ,Branch 0 ,Branch ;
  245: \        over + over ,Branch ,Branch 0 ,Branch ;
  246: 
  247: \ DEFER CheckUntil
  248: VARIABLE NoOutput
  249: VARIABLE C-Pass
  250: 
  251: 0 CONSTANT ScanMode
  252: 1 CONSTANT DisplayMode
  253: 2 CONSTANT DebugMode
  254: 
  255: : Scan? ( -- flag ) C-Pass @ 0= ;
  256: : Display? ( -- flag ) C-Pass @ 1 = ;
  257: : Debug? ( -- flag ) C-Pass @ 2 = ;
  258: 
  259: : back? ( addr target -- addr flag )
  260:     over u< ;
  261: 
  262: : .word ( addr x -- addr )
  263:     \ print x as a word if possible
  264:     dup look 0= IF
  265: 	drop dup threaded>name dup 0= if
  266: 	    drop over 1 cells - @ dup body> look
  267: 	    IF
  268: 		nip nip dup ." <" name>string rot wordinfo .string ." > "
  269: 	    ELSE
  270: 		2drop ." <" 0 .r ." > "
  271: 	    THEN
  272: 	    EXIT
  273: 	then
  274:     THEN
  275:     nip dup cell+ @ immediate-mask and
  276:     IF
  277: 	bl cemit  ." POSTPONE "
  278:     THEN
  279:     dup name>string rot wordinfo .string
  280:     ;
  281: 
  282: : c-call ( addr1 -- addr2 )
  283:     Display? IF
  284: 	dup @ body> .word bl cemit
  285:     THEN
  286:     cell+ ;
  287: 
  288: : c-callxt ( addr1 -- addr2 )
  289:     Display? IF
  290: 	dup @ .word bl cemit
  291:     THEN
  292:     cell+ ;
  293: 
  294: \ here docon: , docol: , dovar: , douser: , dodefer: , dofield: ,
  295: \ here over - 2constant doers
  296: 
  297: : c-lit ( addr1 -- addr2 )
  298:     Display? IF
  299: 	dup @ dup body> dup cfaligned over = swap in-dictionary? and if
  300: 	    ( addr1 addr1@ )
  301: 	    dup body> @ dovar: = if
  302: 		drop c-call EXIT
  303: 	    endif
  304: 	endif
  305: 	\ !! test for cfa here, and print "['] ..."
  306: 	dup abs 0 <# #S rot sign #> 0 .string bl cemit
  307:     endif
  308:     cell+ ;
  309: 
  310: : c-lit+ ( addr1 -- addr2 )
  311:     Display? if
  312: 	dup @ dup abs 0 <# #S rot sign #> 0 .string bl cemit
  313: 	s" + " 0 .string
  314:     endif
  315:     cell+ ;
  316: 
  317: : .name-without ( addr -- addr )
  318:     \ !! the stack effect cannot be correct
  319:     \ prints a name without a() e.g. a(+LOOP) or (s")
  320:     dup 1 cells - @ threaded>name dup IF
  321: 	name>string over c@ 'a = IF
  322: 	    1 /string
  323: 	THEN
  324: 	 over c@ '( = IF
  325: 	    1 /string
  326: 	THEN
  327: 	2dup + 1- c@ ') = IF 1- THEN .struc ELSE drop 
  328:     THEN ;
  329: 
  330: [ifdef] (s")
  331: : c-c"
  332: 	Display? IF nl .name-without THEN
  333:         count 2dup + aligned -rot
  334:         Display?
  335:         IF      bl cemit 0 .string
  336:                 [char] " cemit bl cemit
  337:         ELSE    2drop
  338:         THEN ;
  339: [endif]
  340: 
  341: : c-string? ( addr1 -- addr2 f )
  342:     \ f is true if a string was found and decompiled.
  343:     \ if f is false, addr2=addr1
  344:     \ recognizes the following patterns:
  345:     \ c":     ahead X: len string then lit X
  346:     \ flit:   ahead X: float      then lit X f@
  347:     \ s\":    ahead X: string     then lit X lit len
  348:     \ .\":    ahead X: string     then lit X lit len type
  349:     \ !! not recognized anywhere:
  350:     \ abort": if ahead X: len string then lit X c(abort") then
  351:     dup @ back? if false exit endif
  352:     dup @ >r
  353:     r@ @ decompile-prim ['] lit xt>threaded <> if rdrop false exit endif
  354:     r@ cell+ @ over cell+ <> if rdrop false exit endif
  355:     \ we have at least C"
  356:     r@ 2 cells + @ decompile-prim dup ['] lit xt>threaded = if
  357: 	drop r@ 3 cells + @ over cell+ + aligned r@ = if
  358: 	    \ we have at least s"
  359: 	    r@ 4 cells + @ decompile-prim ['] lit-perform xt>threaded =
  360: 	    r@ 5 cells + @ ['] type >body = and if
  361: 		6 s\" .\\\" "
  362: 	    else
  363: 		4 s\" s\\\" "
  364: 	    endif
  365: 	    \ !! make newline if string too long?
  366: 	    display? if
  367: 		0 .string r@ cell+ @ r@ 3 cells + @ c-\type '" cemit bl cemit
  368: 	    else
  369: 		2drop
  370: 	    endif
  371: 	    nip cells r> + true exit
  372: 	endif
  373:     endif
  374:     ['] f@ xt>threaded = if
  375: 	display? if
  376: 	    r@ cell+ @ f@ 10 8 16 f>str-rdp 0 .string bl cemit
  377: 	endif
  378: 	drop r> 3 cells + true exit
  379:     endif
  380:     \ !! check if count matches space?
  381:     display? if
  382: 	s\" c\" " 0 .string r@ cell+ @ count 0 .string '" cemit bl cemit
  383:     endif
  384:     drop r> 2 cells + true ;
  385: 
  386: : Forward? ( a-addr true | false -- a-addr true | false )
  387:     \ a-addr is pointer into branch table
  388:     \ returns true when jump is a forward jump
  389:     IF
  390: 	dup dup @ swap 1 cells - @ u> IF
  391: 	    true
  392: 	ELSE
  393: 	    drop false
  394: 	THEN
  395: 	\ only if forward jump
  396:     ELSE
  397: 	false
  398:     THEN ;
  399: 
  400: : RepeatCheck ( a-addr1 a-addr2 true | false -- false )
  401:         IF  BEGIN  2dup
  402:                    1 cells - @ swap @
  403:                    u<=
  404:             WHILE  drop dup cell+
  405:                    MoreBranchAddr? 0=
  406:             UNTIL  false
  407:             ELSE   true
  408:             THEN
  409:         ELSE false
  410:         THEN ;
  411: 
  412: : c-branch ( addr1 -- addr2 )
  413:     c-string? ?exit
  414:         Scan?
  415:         IF      dup @ Branch!
  416:                 dup @ back?
  417:                 IF                      \ might be: AGAIN, REPEAT
  418:                         dup cell+ BranchAddr? Forward?
  419:                         RepeatCheck
  420:                         IF      RepeatCode Type!
  421:                                 cell+ Disable swap !
  422:                         ELSE    AgainCode Type!
  423:                         THEN
  424:                 ELSE    dup cell+ BranchAddr? Forward?
  425:                         IF      ElseCode Type! drop
  426:                         ELSE    AheadCode Type!
  427:                         THEN
  428:                 THEN
  429:         THEN
  430:         Display?
  431:         IF
  432:                 dup @ back?
  433:                 IF                      \ might be: AGAIN, REPEAT
  434:                         level- nl
  435:                         dup cell+ BranchAddr? Forward?
  436:                         RepeatCheck
  437:                         IF      drop S" REPEAT " .struc nl
  438:                         ELSE    S" AGAIN " .struc nl
  439:                         THEN
  440:                 ELSE    MyBranch cell+ @ LeaveCode =
  441: 			IF 	S" LEAVE " .struc
  442: 			ELSE
  443: 				dup cell+ BranchAddr? Forward?
  444:        	                 	IF      dup cell+ @ WhileCode2 =
  445:        	                         	IF nl S" ELSE" .struc level+
  446:                                 	ELSE level- nl S" ELSE" .struc level+ THEN
  447:                                 	cell+ Disable swap !
  448:                         	ELSE    S" AHEAD" .struc level+
  449:                         	THEN
  450: 			THEN
  451:                 THEN
  452:         THEN
  453:         Debug?
  454:         IF      @ \ !!! cross-interacts with debugger !!!
  455:         ELSE    cell+
  456:         THEN ;
  457: 
  458: : DebugBranch
  459:         Debug?
  460:         IF      dup @ swap THEN ; \ return 2 different addresses
  461: 
  462: : c-?branch
  463:         Scan?
  464:         IF      dup @ Branch!
  465:                 dup @ Back?
  466:                 IF      UntilCode Type! THEN
  467:         THEN
  468:         Display?
  469:         IF      dup @ Back?
  470:                 IF      level- nl S" UNTIL " .struc nl
  471:                 ELSE    dup    dup @ over +
  472:                         CheckWhile
  473:                         IF      MyBranch
  474:                                 cell+ dup @ 0=
  475:                                          IF WhileCode2 swap !
  476:                                          ELSE drop THEN
  477:                                 level- nl
  478:                                 S" WHILE " .struc
  479:                                 level+
  480:                         ELSE    MyBranch cell+ @ LeaveCode =
  481: 				IF   s" 0= ?LEAVE " .struc
  482: 				ELSE nl S" IF " .struc level+
  483: 				THEN
  484:                         THEN
  485:                 THEN
  486:         THEN
  487:         DebugBranch
  488:         cell+ ;
  489: 
  490: : c-for
  491:         Display? IF nl S" FOR" .struc level+ THEN ;
  492: 
  493: : c-loop
  494:         Display? IF level- nl .name-without nl bl cemit THEN
  495:         DebugBranch cell+ 
  496: 	Scan? 
  497: 	IF 	dup BranchAddr? 
  498: 		BEGIN   WHILE cell+ LeaveCode swap !
  499: 			dup MoreBranchAddr?
  500: 		REPEAT
  501: 	THEN
  502: 	cell+ ;
  503: 
  504: : c-do
  505:         Display? IF nl .name-without level+ THEN ;
  506: 
  507: : c-?do ( addr1 -- addr2 )
  508:     Display? IF
  509: 	nl .name-without level+
  510:     THEN
  511:     DebugBranch cell+ ;
  512: 
  513: : c-exit ( addr1 -- addr2 )
  514:     dup 1 cells -
  515:     CheckEnd
  516:     IF
  517: 	Display? IF nlflag off S" ;" Com# .string THEN
  518: 	C-Stop on
  519:     ELSE
  520: 	Display? IF S" EXIT " .struc THEN
  521:     THEN
  522:     Debug? IF drop THEN ; \ !!! cross-interacts with debugger !!!
  523: 
  524: : c-abort"
  525:         count 2dup + aligned -rot
  526:         Display?
  527:         IF      S" ABORT" .struc
  528:                 [char] " cemit bl cemit 0 .string
  529:                 [char] " cemit bl cemit
  530:         ELSE    2drop
  531:         THEN ;
  532: 
  533: [IFDEF] (does>)
  534: : c-does>               \ end of create part
  535:         Display? IF S" DOES> " Com# .string THEN
  536: 	maxaligned /does-handler + ;
  537: [THEN]
  538: 
  539: [IFDEF] (compile)
  540: : c-(compile)
  541:     Display?
  542:     IF
  543: 	s" POSTPONE " Com# .string
  544: 	dup @ look 0= ABORT" SEE: No valid XT"
  545: 	name>string 0 .string bl cemit
  546:     THEN
  547:     cell+ ;
  548: [THEN]
  549: 
  550: CREATE C-Table
  551: 	        ' lit A,            ' c-lit A,
  552: 		' does-exec A,	    ' c-callxt A,
  553: 		' lit@ A,	    ' c-call A,
  554: [IFDEF] call	' call A,           ' c-call A, [THEN]
  555: \		' useraddr A,	    ....
  556: 		' lit-perform A,    ' c-call A,
  557: 		' lit+ A,	    ' c-lit+ A,
  558: [IFDEF] (s")	' (s") A,	    ' c-c" A, [THEN]
  559: [IFDEF] (.")	' (.") A,	    ' c-c" A, [THEN]
  560: [IFDEF] "lit    ' "lit A,           ' c-c" A, [THEN]
  561: [IFDEF] (c")	' (c") A,	    ' c-c" A, [THEN]
  562:         	' (do) A,           ' c-do A,
  563: [IFDEF] (+do)	' (+do) A,	    ' c-?do A, [THEN]
  564: [IFDEF] (u+do)	' (u+do) A,	    ' c-?do A, [THEN]
  565: [IFDEF] (-do)	' (-do) A,	    ' c-?do A, [THEN]
  566: [IFDEF] (u-do)	' (u-do) A,	    ' c-?do A, [THEN]
  567:         	' (?do) A,          ' c-?do A,
  568:         	' (for) A,          ' c-for A,
  569:         	' ?branch A,        ' c-?branch A,
  570:         	' branch A,         ' c-branch A,
  571:         	' (loop) A,         ' c-loop A,
  572:         	' (+loop) A,        ' c-loop A,
  573: [IFDEF] (s+loop) ' (s+loop) A,      ' c-loop A, [THEN]
  574: [IFDEF] (-loop) ' (-loop) A,        ' c-loop A, [THEN]
  575:         	' (next) A,         ' c-loop A,
  576:         	' ;s A,             ' c-exit A,
  577: [IFDEF] (abort") ' (abort") A,      ' c-abort" A, [THEN]
  578: \ only defined if compiler is loaded
  579: [IFDEF] (compile) ' (compile) A,      ' c-(compile) A, [THEN]
  580: [IFDEF] (does>) ' (does>) A,        ' c-does> A, [THEN]
  581:         	0 ,		here 0 ,
  582: 
  583: avariable c-extender
  584: c-extender !
  585: 
  586: \ DOTABLE                                               15may93jaw
  587: 
  588: : DoTable ( ca/cfa -- flag )
  589:     decompile-prim C-Table BEGIN ( cfa table-entry )
  590: 	dup @ dup 0=  IF
  591: 	    drop cell+ @ dup IF ( next table!)
  592: 		dup @
  593: 	    ELSE ( end!)
  594: 		2drop false EXIT
  595: 	    THEN 
  596: 	THEN
  597: 	\ jump over to extender, if any 26jan97jaw
  598: 	xt>threaded 2 pick <>
  599:     WHILE
  600: 	    2 cells +
  601:     REPEAT
  602:     nip cell+ perform
  603:     true
  604: ;
  605: 
  606: : BranchTo? ( a-addr -- a-addr )
  607:         Display?  IF    dup BranchAddr?
  608:                         IF
  609: 				BEGIN cell+ @ dup 20 u>
  610:                                 IF drop nl S" BEGIN " .struc level+
  611:                                 ELSE
  612:                                   dup Disable <> over LeaveCode <> and
  613:                                   IF   WhileCode2 =
  614:                                        IF nl S" THEN " .struc nl ELSE
  615:                                        level- nl S" THEN " .struc nl THEN
  616:                                   ELSE drop THEN
  617:                                 THEN
  618:                                   dup MoreBranchAddr? 0=
  619:                            UNTIL
  620:                         THEN
  621:                   THEN ;
  622: 
  623: : analyse ( a-addr1 -- a-addr2 )
  624:     Branches @ IF BranchTo? THEN
  625:     dup cell+ swap @
  626:     dup >r DoTable r> swap IF drop EXIT THEN
  627:     Display?
  628:     IF
  629: 	.word bl cemit
  630:     ELSE
  631: 	drop
  632:     THEN ;
  633: 
  634: : c-init
  635:         0 YPos ! 0 XPos !
  636:         0 Level ! nlflag off
  637:         BranchTable BranchPointer !
  638:         c-stop off
  639:         Branches on ;
  640: 
  641: : makepass ( a-addr -- )
  642:     c-stop off
  643:     BEGIN
  644: 	analyse
  645: 	c-stop @
  646:     UNTIL drop ;
  647: 
  648: Defer xt-see-xt ( xt -- )
  649: \ this one is just a forward declaration for indirect recursion
  650: 
  651: : .defname ( xt c-addr u -- )
  652:     rot look
  653:     if ( c-addr u nfa )
  654: 	-rot type space .name
  655:     else
  656: 	drop ." noname " type
  657:     then
  658:     space ;
  659: 
  660: Defer discode ( addr u -- ) \ gforth
  661: \G hook for the disassembler: disassemble code at addr of length u
  662: ' dump IS discode
  663: 
  664: : next-head ( addr1 -- addr2 ) \ gforth
  665:     \G find the next header starting after addr1, up to here (unreliable).
  666:     here swap u+do
  667: 	i head? -2 and if
  668: 	    i unloop exit
  669: 	then
  670:     cell +loop
  671:     here ;
  672: 
  673: [ifundef] umin \ !! bootstrapping help
  674: : umin ( u1 u2 -- u )
  675:     2dup u>
  676:     if
  677: 	swap
  678:     then
  679:     drop ;
  680: [then]
  681: 
  682: : next-prim ( addr1 -- addr2 ) \ gforth
  683:     \G find the next primitive after addr1 (unreliable)
  684:     1+ >r -1 primstart
  685:     begin ( umin head R: boundary )
  686: 	@ dup
  687:     while
  688: 	tuck name>int >code-address ( head1 umin ca R: boundary )
  689: 	r@ - umin
  690: 	swap
  691:     repeat
  692:     drop dup r@ negate u>=
  693:     \ "umin+boundary within [0,boundary)" = "umin within [-boundary,0)"
  694:     if ( umin R: boundary ) \ no primitive found behind -> use a default length
  695: 	drop 31
  696:     then
  697:     r> + ;
  698: 
  699: : seecode ( xt -- )
  700:     dup s" Code" .defname
  701:     >code-address
  702:     dup in-dictionary? \ user-defined code word?
  703:     if
  704: 	dup next-head
  705:     else
  706: 	dup next-prim
  707:     then
  708:     over - discode
  709:     ." end-code" cr ;
  710: : seevar ( xt -- )
  711:     s" Variable" .defname cr ;
  712: : seeuser ( xt -- )
  713:     s" User" .defname cr ;
  714: : seecon ( xt -- )
  715:     dup >body ?
  716:     s" Constant" .defname cr ;
  717: : seevalue ( xt -- )
  718:     dup >body ?
  719:     s" Value" .defname cr ;
  720: : seedefer ( xt -- )
  721:     dup >body @ xt-see-xt cr
  722:     dup s" Defer" .defname cr
  723:     >name ?dup-if
  724: 	." IS " .name cr
  725:     else
  726: 	." latestxt >body !"
  727:     then ;
  728: : see-threaded ( addr -- )
  729:     C-Pass @ DebugMode = IF
  730: 	ScanMode c-pass !
  731: 	EXIT
  732:     THEN
  733:     ScanMode c-pass ! dup makepass
  734:     DisplayMode c-pass ! makepass ;
  735: : seedoes ( xt -- )
  736:     dup s" create" .defname cr
  737:     S" DOES> " Com# .string XPos @ Level !
  738:     >does-code see-threaded ;
  739: : seecol ( xt -- )
  740:     dup s" :" .defname nl
  741:     2 Level !
  742:     >body see-threaded ;
  743: : seefield ( xt -- )
  744:     dup >body ." 0 " ? ." 0 0 "
  745:     s" Field" .defname cr ;
  746: 
  747: : xt-see ( xt -- ) \ gforth
  748:     \G Decompile the definition represented by @i{xt}.
  749:     cr c-init
  750:     dup >does-code
  751:     if
  752: 	seedoes EXIT
  753:     then
  754:     dup xtprim?
  755:     if
  756: 	seecode EXIT
  757:     then
  758:     dup >code-address
  759:     CASE
  760: 	docon: of seecon endof
  761: 	dovalue: of seevalue endof
  762: 	docol: of seecol endof
  763: 	dovar: of seevar endof
  764: [ [IFDEF] douser: ]
  765: 	douser: of seeuser endof
  766: [ [THEN] ]
  767: [ [IFDEF] dodefer: ]
  768: 	dodefer: of seedefer endof
  769: [ [THEN] ]
  770: [ [IFDEF] dofield: ]
  771: 	dofield: of seefield endof
  772: [ [THEN] ]
  773: 	over       of seecode endof \ direct threaded code words
  774: 	over >body of seecode endof \ indirect threaded code words
  775: 	2drop abort" unknown word type"
  776:     ENDCASE ;
  777: 
  778: : (xt-see-xt) ( xt -- )
  779:     xt-see cr ." latestxt" ;
  780: ' (xt-see-xt) is xt-see-xt
  781: 
  782: : (.immediate) ( xt -- )
  783:     ['] execute = if
  784: 	."  immediate"
  785:     then ;
  786: 
  787: : name-see ( nfa -- )
  788:     dup name>int >r
  789:     dup name>comp 
  790:     over r@ =
  791:     if \ normal or immediate word
  792: 	swap xt-see (.immediate)
  793:     else
  794: 	r@ ['] ticking-compile-only-error =
  795: 	if \ compile-only word
  796: 	    swap xt-see (.immediate) ."  compile-only"
  797: 	else \ interpret/compile word
  798: 	    r@ xt-see-xt cr
  799: 	    swap xt-see-xt cr
  800: 	    ." interpret/compile: " over .name drop
  801: 	then
  802:     then
  803:     rdrop drop ;
  804: 
  805: : see ( "<spaces>name" -- ) \ tools
  806:     \G Locate @var{name} using the current search order. Display the
  807:     \G definition of @var{name}. Since this is achieved by decompiling
  808:     \G the definition, the formatting is mechanised and some source
  809:     \G information (comments, interpreted sequences within definitions
  810:     \G etc.) is lost.
  811:     name find-name dup 0=
  812:     IF
  813: 	drop -&13 throw
  814:     THEN
  815:     name-see ;
  816: 
  817: 

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