Annotation of gforth/fflib.fs, revision 1.12

1.2       pazsan      1: \ lib.fs       shared library support package          16aug03py
1.1       pazsan      2: 
1.2       pazsan      3: \ Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc.
1.1       pazsan      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: Variable libs 0 libs !
1.4       pazsan     22: \ links between libraries
1.1       pazsan     23: Variable thisproc
                     24: Variable thislib
1.4       pazsan     25: 
1.2       pazsan     26: Variable revdec  revdec off
                     27: \ turn revdec on to compile bigFORTH libraries
1.4       pazsan     28: Variable revarg  revarg off
                     29: \ turn revarg on to compile declarations with reverse arguments
                     30: Variable legacy  legacy off
                     31: \ turn legacy on to compile bigFORTH legacy libraries
1.2       pazsan     32: 
                     33: Vocabulary c-decl
                     34: Vocabulary cb-decl
1.1       pazsan     35: 
                     36: : @lib ( lib -- )
                     37:     \G obtains library handle
                     38:     cell+ dup 2 cells + count open-lib
                     39:     dup 0= abort" Library not found" swap ! ;
                     40: 
                     41: : @proc ( lib addr -- )
                     42:     \G obtains symbol address
                     43:     cell+ tuck cell+ @ count rot cell+ @
                     44:     lib-sym  dup 0= abort" Proc not found!" swap ! ;
                     45: 
                     46: : proc, ( lib -- )
                     47: \G allocates and initializes proc stub
                     48: \G stub format:
                     49: \G    linked list in library
                     50: \G    address of proc
                     51: \G    ptr to OS name of symbol as counted string
                     52: \G    threaded code for invocation
                     53:     here dup thisproc !
                     54:     swap 2 cells + dup @ A, !
                     55:     0 , 0 A, ;
                     56: 
1.4       pazsan     57: Defer legacy-proc  ' noop IS legacy-proc
                     58: 
1.1       pazsan     59: : proc:  ( lib "name" -- )
1.4       pazsan     60: \G Creates a named proc stub
1.2       pazsan     61:     Create proc, 0 also c-decl
1.4       pazsan     62:     legacy @ IF  legacy-proc  THEN
1.1       pazsan     63: DOES> ( x1 .. xn -- r )
                     64:     dup cell+ @ swap 3 cells + >r ;
                     65: 
1.11      pazsan     66: Variable ind-call ind-call off
1.12    ! pazsan     67: : fptr ( "name" -- )
1.11      pazsan     68:     Create here thisproc ! 0 , 0 , 0 ,  0 also c-decl  ind-call on
                     69:     DOES>  3 cells + >r ;
                     70: 
1.1       pazsan     71: : library ( "name" "file" -- )
1.4       pazsan     72: \G loads library "file" and creates a proc defining word "name"
                     73: \G library format:
                     74: \G    linked list of libraries
                     75: \G    library handle
                     76: \G    linked list of library's procs
                     77: \G    OS name of library as counted string
1.1       pazsan     78:     Create  here libs @ A, dup libs !
1.6       pazsan     79:     0 , 0 A, parse-name string, @lib
1.1       pazsan     80: DOES> ( -- )  dup thislib ! proc: ;
                     81: 
                     82: : init-shared-libs ( -- )
                     83:     defers 'cold  libs
                     84:     0  libs  BEGIN  @ dup  WHILE  dup  REPEAT  drop
                     85:     BEGIN  dup  WHILE  >r
                     86:        r@ @lib
                     87:        r@ 2 cells +  BEGIN  @ dup  WHILE  r@ over @proc  REPEAT
                     88:        drop rdrop
                     89:     REPEAT  drop ;
                     90: 
                     91: ' init-shared-libs IS 'cold
                     92: 
1.4       pazsan     93: : argtype ( revxt pushxt fwxt "name" -- )
                     94:     Create , , , ;
                     95: 
                     96: : arg@ ( arg -- argxt pushxt )
                     97:     revarg @ IF  2 cells + @ ['] noop swap  ELSE  2@  THEN ;
                     98: 
                     99: : arg, ( xt -- )
                    100:     dup ['] noop = IF  drop  EXIT  THEN  compile, ;
                    101: 
                    102: : decl, ( 0 arg1 .. argn call start -- )
1.1       pazsan    103:     2@ compile, >r
1.2       pazsan    104:     revdec @ IF  0 >r
1.4       pazsan    105:        BEGIN  dup  WHILE  >r  REPEAT
                    106:        BEGIN  r> dup  WHILE  arg@ arg,  REPEAT  drop
                    107:        BEGIN  dup  WHILE  arg,  REPEAT drop
                    108:     ELSE  0 >r
                    109:        BEGIN  dup  WHILE  arg@ arg, >r REPEAT drop
                    110:        BEGIN  r> dup  WHILE  arg,  REPEAT  drop
1.1       pazsan    111:     THEN
1.4       pazsan    112:     r> compile,  postpone EXIT ;
                    113: 
                    114: : symbol, ( "c-symbol" -- )
1.6       pazsan    115:     here thisproc @ 2 cells + ! parse-name s,
1.4       pazsan    116:     thislib @ thisproc @ @proc ;
                    117: 
                    118: : rettype ( endxt startxt "name" -- )
                    119:     Create 2,
1.11      pazsan    120:   DOES>  decl, ind-call @ 0= IF  symbol,  THEN
                    121:     previous revarg off ind-call off ;
1.2       pazsan    122: 
                    123: also c-decl definitions
                    124: 
1.4       pazsan    125: : <rev>  revarg on ;
                    126: 
                    127: ' av-int      ' av-int-r      ' >r  argtype int
                    128: ' av-float    ' av-float-r    ' f>l argtype sf
                    129: ' av-double   ' av-double-r   ' f>l argtype df
                    130: ' av-longlong ' av-longlong-r ' 2>r argtype llong
                    131: ' av-ptr      ' av-ptr-r      ' >r  argtype ptr
                    132: 
                    133: ' av-call-void     ' av-start-void     rettype (void)
                    134: ' av-call-int      ' av-start-int      rettype (int)
                    135: ' av-call-float    ' av-start-float    rettype (sf)
                    136: ' av-call-double   ' av-start-double   rettype (fp)
1.1       pazsan    137: ' av-call-longlong ' av-start-longlong rettype (llong)
1.4       pazsan    138: ' av-call-ptr      ' av-start-ptr      rettype (ptr)
1.1       pazsan    139: 
1.10      pazsan    140: : (addr)  postpone EXIT drop symbol, previous revarg off ;
1.8       pazsan    141: 
1.2       pazsan    142: previous definitions
1.1       pazsan    143: 
1.4       pazsan    144: \ legacy support for old library interfaces
                    145: \ interface to old vararg stuff not implemented yet
1.1       pazsan    146: 
1.2       pazsan    147: also c-decl
1.1       pazsan    148: 
1.4       pazsan    149: :noname ( n 0 -- 0 int1 .. intn )
                    150:     legacy @ 0< revarg !
                    151:     swap 0 ?DO  int  LOOP  (int)
                    152: ; IS legacy-proc
                    153: 
1.1       pazsan    154: : (int) ( n -- )
1.4       pazsan    155:     >r ' execute r> 0 ?DO  int  LOOP  (int) ;
1.1       pazsan    156: : (void) ( n -- )
1.4       pazsan    157:     >r ' execute r> 0 ?DO  int  LOOP  (void) ;
1.1       pazsan    158: : (float) ( n -- )
1.4       pazsan    159:     >r ' execute r> 0 ?DO  df   LOOP  (fp) ;
1.2       pazsan    160: 
                    161: previous
                    162: 
                    163: \ callback stuff
                    164: 
                    165: Variable callbacks
                    166: \G link between callbacks
                    167: 
                    168: : callback ( -- )
                    169:     Create  0 ] postpone >r also cb-decl
                    170:   DOES>
                    171:     Create here >r 0 , callbacks @ A, r@ callbacks !
1.3       pazsan    172:     swap postpone Literal postpone call , postpone EXIT
1.2       pazsan    173:     r> dup cell+ cell+ alloc-callback swap !
                    174:   DOES> @ ;
                    175: 
                    176: : callback; ( 0 xt1 .. xtn -- )
                    177:     BEGIN  over  WHILE  compile,  REPEAT
                    178:     postpone r> postpone execute compile, drop
                    179:     postpone EXIT postpone [ previous ; immediate
                    180: 
                    181: : va-ret ( xt xt -- )
                    182:     Create A, A, immediate
                    183:   DOES> 2@ compile, ;
                    184: 
                    185: : init-callbacks ( -- )
                    186:     defers 'cold  callbacks 1 cells -
                    187:     BEGIN  cell+ @ dup  WHILE  dup cell+ cell+ alloc-callback over !
                    188:     REPEAT  drop ;
                    189: 
                    190: ' init-callbacks IS 'cold
                    191: 
                    192: also cb-decl definitions
                    193: 
                    194: \ arguments
1.1       pazsan    195: 
1.2       pazsan    196: ' va-arg-int      Alias int
                    197: ' va-arg-float    Alias sf
                    198: ' va-arg-double   Alias df
                    199: ' va-arg-longlong Alias llong
                    200: ' va-arg-ptr      Alias ptr
                    201: 
                    202: ' va-return-void     ' va-start-void     va-ret (void)
                    203: ' va-return-int      ' va-start-int      va-ret (int)
                    204: ' va-return-float    ' va-start-float    va-ret (sf)
                    205: ' va-return-double   ' va-start-double   va-ret (fp)
                    206: ' va-return-longlong ' va-start-longlong va-ret (llong)
                    207: ' va-return-ptr      ' va-start-ptr      va-ret (ptr)
                    208: 
                    209: previous definitions

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