File:  [gforth] / gforth / see.fs
Revision 1.73: download - view: text, annotated - select for diffs
Sat Aug 28 09:48:53 2010 UTC (10 years, 8 months ago) by dvdkhlng
Branches: MAIN
CVS tags: HEAD
2 bugfixes for see:

- ': array does> if then ;' would fail with 'SEE: Table failure'.

  Reason: c-lit encountering DOES> would incremented the address by only 1
  cell in scan-pass, not the correct 3 cells as in display-pass.

- ;abi-code was treated like 'does>' thus trying to decoding machine code as
   forth code.  For now stop decoding when ;abi-code is encountered.

    1: \ SEE.FS       highend SEE for ANSforth                16may93jaw
    2: 
    3: \ Copyright (C) 1995,2000,2003,2004,2006,2007,2008 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: 
   21: \ May be cross-compiled
   22: 
   23: \ I'm sorry. This is really not "forthy" enough.
   24: 
   25: \ Ideas:        Level should be a stack
   26: 
   27: require look.fs
   28: require termsize.fs
   29: require wordinfo.fs
   30: 
   31: decimal
   32: 
   33: \ Screen format words                                   16may93jaw
   34: 
   35: VARIABLE C-Output   1 C-Output  !
   36: VARIABLE C-Formated 1 C-Formated !
   37: VARIABLE C-Highlight 0 C-Highlight !
   38: VARIABLE C-Clearline 0 C-Clearline !
   39: 
   40: VARIABLE XPos
   41: VARIABLE YPos
   42: VARIABLE Level
   43: 
   44: : Format        C-Formated @ C-Output @ and
   45:                 IF dup spaces XPos +! ELSE drop THEN ;
   46: 
   47: : level+        7 Level +!
   48:                 Level @ XPos @ -
   49:                 dup 0> IF Format ELSE drop THEN ;
   50: 
   51: : level-        -7 Level +! ;
   52: 
   53: VARIABLE nlflag
   54: VARIABLE uppercase	\ structure words are in uppercase
   55: 
   56: DEFER nlcount ' noop IS nlcount
   57: 
   58: : nl            nlflag on ;
   59: : (nl)          nlcount
   60:                 XPos @ Level @ = IF EXIT THEN \ ?Exit
   61:                 C-Formated @ IF
   62:                 C-Output @
   63:                 IF C-Clearline @ IF cols XPos @ - spaces
   64:                                  ELSE cr THEN
   65:                 1 YPos +! 0 XPos !
   66:                 Level @ spaces
   67:                 THEN Level @ XPos ! THEN ;
   68: 
   69: : warp?         ( len -- len )
   70:                 nlflag @ IF (nl) nlflag off THEN
   71:                 XPos @ over + cols u>= IF (nl) THEN ;
   72: 
   73: : ctype         ( adr len -- )
   74:                 warp? dup XPos +! C-Output @ 
   75: 		IF uppercase @ IF bounds ?DO i c@ toupper emit LOOP
   76: 				  uppercase off ELSE type THEN
   77: 		ELSE 2drop THEN ;
   78: 
   79: : cemit         1 warp?
   80:                 over bl = Level @ XPos @ = and
   81:                 IF 2drop ELSE XPos +! C-Output @ IF emit ELSE drop THEN
   82:                 THEN ;
   83: 
   84: DEFER .string ( c-addr u n -- )
   85: 
   86: [IFDEF] Green
   87: VARIABLE Colors Colors on
   88: 
   89: : (.string)     ( c-addr u n -- )
   90:                 over warp? drop
   91:                 Colors @
   92:                 IF C-Highlight @ ?dup
   93:                    IF   CT@ swap CT@ or
   94:                    ELSE CT@
   95:                    THEN
   96:                 attr! ELSE drop THEN
   97:                 ctype  ct @ attr! ;
   98: [ELSE]
   99: : (.string)     ( c-addr u n -- )
  100:                 drop ctype ;
  101: [THEN]
  102: 
  103: ' (.string) IS .string
  104: 
  105: : c-\type ( c-addr u -- )
  106:     \ type string in \-escaped form
  107:     begin
  108: 	dup while
  109: 	    2dup newline string-prefix? if
  110: 		'\ cemit 'n cemit
  111: 		newline nip /string
  112: 	    else
  113: 		over c@
  114: 		dup '" = over '\ = or if
  115: 		    '\ cemit cemit
  116: 		else
  117: 		    dup bl 127 within if
  118: 			cemit
  119: 		    else
  120: 			base @ >r try
  121: 			    8 base ! 0 <<# # # # '\ hold #> ctype #>> 0
  122: 			restore
  123: 			    r@ base !
  124: 			endtry
  125: 			rdrop throw
  126: 		    endif
  127: 		endif
  128: 		1 /string
  129: 	    endif
  130:     repeat
  131:     2drop ;
  132: 
  133: : .struc        
  134: 	uppercase on Str# .string ;
  135: 
  136: \ CODES (Branchtypes)                                    15may93jaw
  137: 
  138: 21 CONSTANT RepeatCode
  139: 22 CONSTANT AgainCode
  140: 23 CONSTANT UntilCode
  141: \ 09 CONSTANT WhileCode
  142: 10 CONSTANT ElseCode
  143: 11 CONSTANT AheadCode
  144: 13 CONSTANT WhileCode2
  145: 14 CONSTANT Disable
  146: 15 CONSTANT LeaveCode
  147: 
  148: 
  149: \ FORMAT WORDS                                          13jun93jaw
  150: 
  151: VARIABLE C-Stop
  152: VARIABLE Branches
  153: 
  154: VARIABLE BranchPointer	\ point to the end of branch table
  155: VARIABLE SearchPointer
  156: 
  157: \ The branchtable consists of three entrys:
  158: \ address of branch , branch destination , branch type
  159: 
  160: CREATE BranchTable 128 cells allot
  161: here 3 cells -
  162: ACONSTANT MaxTable
  163: 
  164: : FirstBranch BranchTable cell+ SearchPointer ! ;
  165: 
  166: : (BranchAddr?) ( a-addr1 -- a-addr2 true | false )
  167: \ searches a branch with destination a-addr1
  168: \ a-addr1: branch destination
  169: \ a-addr2: pointer in branch table
  170:         SearchPointer @
  171:         BEGIN   dup BranchPointer @ u<
  172:         WHILE
  173:                 dup @ 2 pick <>
  174:         WHILE   3 cells +
  175:         REPEAT
  176:         nip dup  3 cells + SearchPointer ! true
  177:         ELSE
  178:         2drop false
  179:         THEN ;
  180: 
  181: : BranchAddr?
  182:         FirstBranch (BranchAddr?) ;
  183: 
  184: ' (BranchAddr?) ALIAS MoreBranchAddr?
  185: 
  186: : CheckEnd ( a-addr -- true | false )
  187:         BranchTable cell+
  188:         BEGIN   dup BranchPointer @ u<
  189:         WHILE
  190:                 dup @ 2 pick u<=
  191:         WHILE   3 cells +
  192:         REPEAT
  193:         2drop false
  194:         ELSE
  195:         2drop true
  196:         THEN ;
  197: 
  198: : MyBranch      ( a-addr -- a-addr a-addr2 )
  199: \ finds branch table entry for branch at a-addr
  200:                 dup @
  201:                 BranchAddr?
  202:                 BEGIN
  203:                 WHILE 1 cells - @
  204:                       over <>
  205:                 WHILE dup @
  206:                       MoreBranchAddr?
  207:                 REPEAT
  208:                 SearchPointer @ 3 cells -
  209:                 ELSE    true ABORT" SEE: Table failure"
  210:                 THEN ;
  211: 
  212: \
  213: \                 addrw               addrt
  214: \       BEGIN ... WHILE ... AGAIN ... THEN
  215: \         ^         !        !          ^
  216: \         ----------+--------+          !
  217: \                   !                   !
  218: \                   +-------------------+
  219: \
  220: \
  221: 
  222: : CheckWhile ( a-addrw a-addrt -- true | false )
  223:         BranchTable
  224:         BEGIN   dup BranchPointer @ u<
  225:         WHILE   dup @ 3 pick u>
  226:                 over @ 3 pick u< and
  227:                 IF dup cell+ @ 3 pick u<
  228:                         IF 2drop drop true EXIT THEN
  229:                 THEN
  230:                 3 cells +
  231:         REPEAT
  232:         2drop drop false ;
  233: 
  234: : ,Branch ( a-addr -- )
  235:         BranchPointer @ dup MaxTable u> ABORT" SEE: Table overflow"
  236:         !
  237:         1 cells BranchPointer +! ;
  238: 
  239: : Type!   ( u -- )
  240:         BranchPointer @ 1 cells - ! ;
  241: 
  242: : Branch! ( a-addr rel -- a-addr )
  243:     over ,Branch ,Branch 0 ,Branch ;
  244: \        over + over ,Branch ,Branch 0 ,Branch ;
  245: 
  246: \ DEFER CheckUntil
  247: VARIABLE NoOutput
  248: VARIABLE C-Pass
  249: 
  250: 0 CONSTANT ScanMode
  251: 1 CONSTANT DisplayMode
  252: 2 CONSTANT DebugMode
  253: 
  254: : Scan? ( -- flag ) C-Pass @ 0= ;
  255: : Display? ( -- flag ) C-Pass @ 1 = ;
  256: : Debug? ( -- flag ) C-Pass @ 2 = ;
  257: : ?.string  ( c-addr u n -- )   Display? if .string else 2drop drop then ;
  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: [IFDEF] !does
  298: : c-does>               \ end of create part
  299:         Display? IF S" DOES> " Com# .string THEN ;
  300: \	maxaligned /does-handler + ; \ !! no longer needed for non-cross stuff
  301: [THEN]
  302: 
  303: : c-lit ( addr1 -- addr2 )
  304:     dup @ dup body> dup cfaligned over = swap in-dictionary? and if
  305: 	( addr1 addr1@ )
  306: 	dup body> @ dovar: = if
  307: 	    drop c-call EXIT
  308: 	endif
  309:     endif
  310:     over 4 cells + over = if
  311: 	over 1 cells + @ decompile-prim ['] call xt>threaded = >r
  312: 	over 3 cells + @ decompile-prim ['] ;S xt>threaded =
  313: 	r> and if
  314: 	    over 2 cells + @ ['] !does >body = if  drop
  315: 		S" DOES> " Com# ?.string 4 cells + EXIT endif
  316: 	endif
  317: 	[IFDEF] !;abi-code
  318: 	    over 2 cells + @ ['] !;abi-code >body = if  drop
  319: 		S" ;abi-code " Com# ?.string 4 cells +
  320: 		c-stop on
  321: 		EXIT
  322: 	    endif
  323: 	[THEN]
  324:     endif
  325:     Display? if
  326: 	\ !! test for cfa here, and print "['] ..."
  327: 	dup abs 0 <# #S rot sign #> 0 .string bl cemit
  328:     else  drop  then
  329:     cell+ ;
  330: 
  331: : c-lit+ ( addr1 -- addr2 )
  332:     Display? if
  333: 	dup @ dup abs 0 <# #S rot sign #> 0 .string bl cemit
  334: 	s" + " 0 .string
  335:     endif
  336:     cell+ ;
  337: 
  338: : .name-without ( addr -- addr )
  339:     \ !! the stack effect cannot be correct
  340:     \ prints a name without a() e.g. a(+LOOP) or (s")
  341:     dup 1 cells - @ threaded>name dup IF
  342: 	name>string over c@ 'a = IF
  343: 	    1 /string
  344: 	THEN
  345: 	 over c@ '( = IF
  346: 	    1 /string
  347: 	THEN
  348: 	2dup + 1- c@ ') = IF 1- THEN .struc ELSE drop 
  349:     THEN ;
  350: 
  351: [ifdef] (s")
  352: : c-c"
  353: 	Display? IF nl .name-without THEN
  354:         count 2dup + aligned -rot
  355:         Display?
  356:         IF      bl cemit 0 .string
  357:                 [char] " cemit bl cemit
  358:         ELSE    2drop
  359:         THEN ;
  360: [endif]
  361: 
  362: : c-string? ( addr1 -- addr2 f )
  363:     \ f is true if a string was found and decompiled.
  364:     \ if f is false, addr2=addr1
  365:     \ recognizes the following patterns:
  366:     \ c":     ahead X: len string then lit X
  367:     \ flit:   ahead X: float      then lit X f@
  368:     \ s\":    ahead X: string     then lit X lit len
  369:     \ .\":    ahead X: string     then lit X lit len type
  370:     \ !! not recognized anywhere:
  371:     \ abort": if ahead X: len string then lit X c(abort") then
  372:     dup @ back? if false exit endif
  373:     dup @ >r
  374:     r@ @ decompile-prim ['] lit xt>threaded <> if rdrop false exit endif
  375:     r@ cell+ @ over cell+ <> if rdrop false exit endif
  376:     \ we have at least C"
  377:     r@ 2 cells + @ decompile-prim dup ['] lit xt>threaded = if
  378: 	drop r@ 3 cells + @ over cell+ + aligned r@ = if
  379: 	    \ we have at least s"
  380: 	    r@ 4 cells + @ decompile-prim ['] lit-perform xt>threaded =
  381: 	    r@ 5 cells + @ ['] type >body = and if
  382: 		6 s\" .\\\" "
  383: 	    else
  384: 		4 s\" s\\\" "
  385: 	    endif
  386: 	    \ !! make newline if string too long?
  387: 	    display? if
  388: 		0 .string r@ cell+ @ r@ 3 cells + @ c-\type '" cemit bl cemit
  389: 	    else
  390: 		2drop
  391: 	    endif
  392: 	    nip cells r> + true exit
  393: 	endif
  394:     endif
  395:     ['] f@ xt>threaded = if
  396: 	display? if
  397: 	    r@ cell+ @ f@ 10 8 16 f>str-rdp 0 .string bl cemit
  398: 	endif
  399: 	drop r> 3 cells + true exit
  400:     endif
  401:     \ !! check if count matches space?
  402:     display? if
  403: 	s\" c\" " 0 .string r@ cell+ @ count 0 .string '" cemit bl cemit
  404:     endif
  405:     drop r> 2 cells + true ;
  406: 
  407: : Forward? ( a-addr true | false -- a-addr true | false )
  408:     \ a-addr is pointer into branch table
  409:     \ returns true when jump is a forward jump
  410:     IF
  411: 	dup dup @ swap 1 cells - @ u> IF
  412: 	    true
  413: 	ELSE
  414: 	    drop false
  415: 	THEN
  416: 	\ only if forward jump
  417:     ELSE
  418: 	false
  419:     THEN ;
  420: 
  421: : RepeatCheck ( a-addr1 a-addr2 true | false -- false )
  422:         IF  BEGIN  2dup
  423:                    1 cells - @ swap @
  424:                    u<=
  425:             WHILE  drop dup cell+
  426:                    MoreBranchAddr? 0=
  427:             UNTIL  false
  428:             ELSE   true
  429:             THEN
  430:         ELSE false
  431:         THEN ;
  432: 
  433: : c-branch ( addr1 -- addr2 )
  434:     c-string? ?exit
  435:         Scan?
  436:         IF      dup @ Branch!
  437:                 dup @ back?
  438:                 IF                      \ might be: AGAIN, REPEAT
  439:                         dup cell+ BranchAddr? Forward?
  440:                         RepeatCheck
  441:                         IF      RepeatCode Type!
  442:                                 cell+ Disable swap !
  443:                         ELSE    AgainCode Type!
  444:                         THEN
  445:                 ELSE    dup cell+ BranchAddr? Forward?
  446:                         IF      ElseCode Type! drop
  447:                         ELSE    AheadCode Type!
  448:                         THEN
  449:                 THEN
  450:         THEN
  451:         Display?
  452:         IF
  453:                 dup @ back?
  454:                 IF                      \ might be: AGAIN, REPEAT
  455:                         level- nl
  456:                         dup cell+ BranchAddr? Forward?
  457:                         RepeatCheck
  458:                         IF      drop S" REPEAT " .struc nl
  459:                         ELSE    S" AGAIN " .struc nl
  460:                         THEN
  461:                 ELSE    MyBranch cell+ @ LeaveCode =
  462: 			IF 	S" LEAVE " .struc
  463: 			ELSE
  464: 				dup cell+ BranchAddr? Forward?
  465:        	                 	IF      dup cell+ @ WhileCode2 =
  466:        	                         	IF nl S" ELSE" .struc level+
  467:                                 	ELSE level- nl S" ELSE" .struc level+ THEN
  468:                                 	cell+ Disable swap !
  469:                         	ELSE    S" AHEAD" .struc level+
  470:                         	THEN
  471: 			THEN
  472:                 THEN
  473:         THEN
  474:         Debug?
  475:         IF      @ \ !!! cross-interacts with debugger !!!
  476:         ELSE    cell+
  477:         THEN ;
  478: 
  479: : DebugBranch
  480:         Debug?
  481:         IF      dup @ swap THEN ; \ return 2 different addresses
  482: 
  483: : c-?branch
  484:         Scan?
  485:         IF      dup @ Branch!
  486:                 dup @ Back?
  487:                 IF      UntilCode Type! THEN
  488:         THEN
  489:         Display?
  490:         IF      dup @ Back?
  491:                 IF      level- nl S" UNTIL " .struc nl
  492:                 ELSE    dup    dup @ over +
  493:                         CheckWhile
  494:                         IF      MyBranch
  495:                                 cell+ dup @ 0=
  496:                                          IF WhileCode2 swap !
  497:                                          ELSE drop THEN
  498:                                 level- nl
  499:                                 S" WHILE " .struc
  500:                                 level+
  501:                         ELSE    MyBranch cell+ @ LeaveCode =
  502: 				IF   s" 0= ?LEAVE " .struc
  503: 				ELSE nl S" IF " .struc level+
  504: 				THEN
  505:                         THEN
  506:                 THEN
  507:         THEN
  508:         DebugBranch
  509:         cell+ ;
  510: 
  511: : c-for
  512:         Display? IF nl S" FOR" .struc level+ THEN ;
  513: 
  514: : c-loop
  515:         Display? IF level- nl .name-without nl bl cemit THEN
  516:         DebugBranch cell+ 
  517: 	Scan? 
  518: 	IF 	dup BranchAddr? 
  519: 		BEGIN   WHILE cell+ LeaveCode swap !
  520: 			dup MoreBranchAddr?
  521: 		REPEAT
  522: 	THEN
  523: 	cell+ ;
  524: 
  525: : c-do
  526:         Display? IF nl .name-without level+ THEN ;
  527: 
  528: : c-?do ( addr1 -- addr2 )
  529:     Display? IF
  530: 	nl .name-without level+
  531:     THEN
  532:     DebugBranch cell+ ;
  533: 
  534: : c-exit ( addr1 -- addr2 )
  535:     dup 1 cells -
  536:     CheckEnd
  537:     IF
  538: 	Display? IF nlflag off S" ;" Com# .string THEN
  539: 	C-Stop on
  540:     ELSE
  541: 	Display? IF S" EXIT " .struc THEN
  542:     THEN
  543:     Debug? IF drop THEN ; \ !!! cross-interacts with debugger !!!
  544: 
  545: : c-abort"
  546:         count 2dup + aligned -rot
  547:         Display?
  548:         IF      S" ABORT" .struc
  549:                 [char] " cemit bl cemit 0 .string
  550:                 [char] " cemit bl cemit
  551:         ELSE    2drop
  552:         THEN ;
  553: 
  554: [IFDEF] (compile)
  555: : c-(compile)
  556:     Display?
  557:     IF
  558: 	s" POSTPONE " Com# .string
  559: 	dup @ look 0= ABORT" SEE: No valid XT"
  560: 	name>string 0 .string bl cemit
  561:     THEN
  562:     cell+ ;
  563: [THEN]
  564: 
  565: CREATE C-Table
  566: 	        ' lit A,            ' c-lit A,
  567: 		' does-exec A,	    ' c-callxt A,
  568: 		' lit@ A,	    ' c-call A,
  569: [IFDEF] call	' call A,           ' c-call A, [THEN]
  570: \		' useraddr A,	    ....
  571: 		' lit-perform A,    ' c-call A,
  572: 		' lit+ A,	    ' c-lit+ A,
  573: [IFDEF] (s")	' (s") A,	    ' c-c" A, [THEN]
  574: [IFDEF] (.")	' (.") A,	    ' c-c" A, [THEN]
  575: [IFDEF] "lit    ' "lit A,           ' c-c" A, [THEN]
  576: [IFDEF] (c")	' (c") A,	    ' c-c" A, [THEN]
  577:         	' (do) A,           ' c-do A,
  578: [IFDEF] (+do)	' (+do) A,	    ' c-?do A, [THEN]
  579: [IFDEF] (u+do)	' (u+do) A,	    ' c-?do A, [THEN]
  580: [IFDEF] (-do)	' (-do) A,	    ' c-?do A, [THEN]
  581: [IFDEF] (u-do)	' (u-do) A,	    ' c-?do A, [THEN]
  582:         	' (?do) A,          ' c-?do A,
  583:         	' (for) A,          ' c-for A,
  584:         	' ?branch A,        ' c-?branch A,
  585:         	' branch A,         ' c-branch A,
  586:         	' (loop) A,         ' c-loop A,
  587:         	' (+loop) A,        ' c-loop A,
  588: [IFDEF] (s+loop) ' (s+loop) A,      ' c-loop A, [THEN]
  589: [IFDEF] (-loop) ' (-loop) A,        ' c-loop A, [THEN]
  590:         	' (next) A,         ' c-loop A,
  591:         	' ;s A,             ' c-exit A,
  592: [IFDEF] (abort") ' (abort") A,      ' c-abort" A, [THEN]
  593: \ only defined if compiler is loaded
  594: [IFDEF] (compile) ' (compile) A,      ' c-(compile) A, [THEN]
  595:         	0 ,		here 0 ,
  596: 
  597: avariable c-extender
  598: c-extender !
  599: 
  600: \ DOTABLE                                               15may93jaw
  601: 
  602: : DoTable ( ca/cfa -- flag )
  603:     decompile-prim C-Table BEGIN ( cfa table-entry )
  604: 	dup @ dup 0=  IF
  605: 	    drop cell+ @ dup IF ( next table!)
  606: 		dup @
  607: 	    ELSE ( end!)
  608: 		2drop false EXIT
  609: 	    THEN 
  610: 	THEN
  611: 	\ jump over to extender, if any 26jan97jaw
  612: 	xt>threaded 2 pick <>
  613:     WHILE
  614: 	    2 cells +
  615:     REPEAT
  616:     nip cell+ perform
  617:     true
  618: ;
  619: 
  620: : BranchTo? ( a-addr -- a-addr )
  621:         Display?  IF    dup BranchAddr?
  622:                         IF
  623: 				BEGIN cell+ @ dup 20 u>
  624:                                 IF drop nl S" BEGIN " .struc level+
  625:                                 ELSE
  626:                                   dup Disable <> over LeaveCode <> and
  627:                                   IF   WhileCode2 =
  628:                                        IF nl S" THEN " .struc nl ELSE
  629:                                        level- nl S" THEN " .struc nl THEN
  630:                                   ELSE drop THEN
  631:                                 THEN
  632:                                   dup MoreBranchAddr? 0=
  633:                            UNTIL
  634:                         THEN
  635:                   THEN ;
  636: 
  637: : analyse ( a-addr1 -- a-addr2 )
  638:     Branches @ IF BranchTo? THEN
  639:     dup cell+ swap @
  640:     dup >r DoTable r> swap IF drop EXIT THEN
  641:     Display?
  642:     IF
  643: 	.word bl cemit
  644:     ELSE
  645: 	drop
  646:     THEN ;
  647: 
  648: : c-init
  649:         0 YPos ! 0 XPos !
  650:         0 Level ! nlflag off
  651:         BranchTable BranchPointer !
  652:         c-stop off
  653:         Branches on ;
  654: 
  655: : makepass ( a-addr -- )
  656:     c-stop off
  657:     BEGIN
  658: 	analyse
  659: 	c-stop @
  660:     UNTIL drop ;
  661: 
  662: Defer xt-see-xt ( xt -- )
  663: \ this one is just a forward declaration for indirect recursion
  664: 
  665: : .defname ( xt c-addr u -- )
  666:     rot look
  667:     if ( c-addr u nfa )
  668: 	-rot type space .name
  669:     else
  670: 	drop ." noname " type
  671:     then
  672:     space ;
  673: 
  674: Defer discode ( addr u -- ) \ gforth
  675: \G hook for the disassembler: disassemble u bytes of code at addr
  676: ' dump IS discode
  677: 
  678: : next-head ( addr1 -- addr2 ) \ gforth
  679:     \G find the next header starting after addr1, up to here (unreliable).
  680:     here swap u+do
  681: 	i head? -2 and if
  682: 	    i unloop exit
  683: 	then
  684:     cell +loop
  685:     here ;
  686: 
  687: [ifundef] umin \ !! bootstrapping help
  688: : umin ( u1 u2 -- u )
  689:     2dup u>
  690:     if
  691: 	swap
  692:     then
  693:     drop ;
  694: [then]
  695: 
  696: : next-prim ( addr1 -- addr2 ) \ gforth
  697:     \G find the next primitive after addr1 (unreliable)
  698:     1+ >r -1 primstart
  699:     begin ( umin head R: boundary )
  700: 	@ dup
  701:     while
  702: 	tuck name>int >code-address ( head1 umin ca R: boundary )
  703: 	r@ - umin
  704: 	swap
  705:     repeat
  706:     drop dup r@ negate u>=
  707:     \ "umin+boundary within [0,boundary)" = "umin within [-boundary,0)"
  708:     if ( umin R: boundary ) \ no primitive found behind -> use a default length
  709: 	drop 31
  710:     then
  711:     r> + ;
  712: 
  713: : seecode ( xt -- )
  714:     dup s" Code" .defname
  715:     >code-address
  716:     dup in-dictionary? \ user-defined code word?
  717:     if
  718: 	dup next-head
  719:     else
  720: 	dup next-prim
  721:     then
  722:     over - discode
  723:     ." end-code" cr ;
  724: : seeabicode ( xt -- )
  725:     dup s" ABI-Code" .defname
  726:     >body dup dup next-head 
  727:     swap - discode
  728:     ." end-code" cr ;
  729: : seevar ( xt -- )
  730:     s" Variable" .defname cr ;
  731: : seeuser ( xt -- )
  732:     s" User" .defname cr ;
  733: : seecon ( xt -- )
  734:     dup >body ?
  735:     s" Constant" .defname cr ;
  736: : seevalue ( xt -- )
  737:     dup >body ?
  738:     s" Value" .defname cr ;
  739: : seedefer ( xt -- )
  740:     dup >body @ xt-see-xt cr
  741:     dup s" Defer" .defname cr
  742:     >name ?dup-if
  743: 	." IS " .name cr
  744:     else
  745: 	." latestxt >body !"
  746:     then ;
  747: : see-threaded ( addr -- )
  748:     C-Pass @ DebugMode = IF
  749: 	ScanMode c-pass !
  750: 	EXIT
  751:     THEN
  752:     ScanMode c-pass ! dup makepass
  753:     DisplayMode c-pass ! makepass ;
  754: : seedoes ( xt -- )
  755:     dup s" create" .defname cr
  756:     S" DOES> " Com# .string XPos @ Level !
  757:     >does-code see-threaded ;
  758: : seecol ( xt -- )
  759:     dup s" :" .defname nl
  760:     2 Level !
  761:     >body see-threaded ;
  762: : seefield ( xt -- )
  763:     dup >body ." 0 " ? ." 0 0 "
  764:     s" Field" .defname cr ;
  765: 
  766: : xt-see ( xt -- ) \ gforth
  767:     \G Decompile the definition represented by @i{xt}.
  768:     cr c-init
  769:     dup >does-code
  770:     if
  771: 	seedoes EXIT
  772:     then
  773:     dup xtprim?
  774:     if
  775: 	seecode EXIT
  776:     then
  777:     dup >code-address
  778:     CASE
  779: 	docon: of seecon endof
  780: [IFDEF] dovalue:
  781:         dovalue: of seevalue endof
  782: [THEN]
  783: 	docol: of seecol endof
  784: 	dovar: of seevar endof
  785: [IFDEF] douser:
  786: 	douser: of seeuser endof
  787: [THEN]
  788: [IFDEF] dodefer:
  789: 	dodefer: of seedefer endof
  790: [THEN]
  791: [IFDEF] dofield:
  792: 	dofield: of seefield endof
  793: [THEN]
  794: [IFDEF] doabicode:
  795:         doabicode: of seeabicode endof
  796: [THEN]
  797: 	over       of seecode endof \ direct threaded code words
  798: 	over >body of seecode endof \ indirect threaded code words
  799: 	2drop abort" unknown word type"
  800:     ENDCASE ;
  801: 
  802: : (xt-see-xt) ( xt -- )
  803:     xt-see cr ." latestxt" ;
  804: ' (xt-see-xt) is xt-see-xt
  805: 
  806: : (.immediate) ( xt -- )
  807:     ['] execute = if
  808: 	."  immediate"
  809:     then ;
  810: 
  811: : name-see ( nfa -- )
  812:     dup name>int >r
  813:     dup name>comp 
  814:     over r@ =
  815:     if \ normal or immediate word
  816: 	swap xt-see (.immediate)
  817:     else
  818: 	r@ ['] ticking-compile-only-error =
  819: 	if \ compile-only word
  820: 	    swap xt-see (.immediate) ."  compile-only"
  821: 	else \ interpret/compile word
  822: 	    r@ xt-see-xt cr
  823: 	    swap xt-see-xt cr
  824: 	    ." interpret/compile: " over .name drop
  825: 	then
  826:     then
  827:     rdrop drop ;
  828: 
  829: : see ( "<spaces>name" -- ) \ tools
  830:     \G Locate @var{name} using the current search order. Display the
  831:     \G definition of @var{name}. Since this is achieved by decompiling
  832:     \G the definition, the formatting is mechanised and some source
  833:     \G information (comments, interpreted sequences within definitions
  834:     \G etc.) is lost.
  835:     name find-name dup 0=
  836:     IF
  837: 	drop -&13 throw
  838:     THEN
  839:     name-see ;
  840: 
  841: 

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