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Diff for /gforth/libcc.fs between versions 1.1 and 1.2

version 1.1, 2006/04/08 19:32:41 version 1.2, 2006/12/26 19:10:54
Line 21 Line 21
   
 \ What this implementation does is this: if it sees a declaration like  \ What this implementation does is this: if it sees a declaration like
   
 \ libc dlseek int dlong int (dlong) lseek ( fd doffset whence -- doffset2 )  \ \ something that tells it to include <unistd.h>
   \ \ something that tells it that the current library is libc
   
   \ c-function dlseek lseek n d n -- d
   
 \ it genererates C code similar to the following:  \ it genererates C code similar to the following:
   
 \ #include <gforth.h>  \ #include <gforth.h>
   \ #include <unistd.h>
 \   \ 
 \ void gforth_call_dl_i_dl_i(void)  \ void gforth_c_lseek_ndn_d(void)
 \ {  \ {
 \   Cell *sp = gforth_SP;  \   Cell *sp = gforth_SP;
 \   Float *fp = gforth_FP;  \   Float *fp = gforth_FP;
 \   long (*func)(int, long, int);  \   long long result;  /* longest type in C */
 \   int arg1;  \   gforth_ll2d(lseek(sp[3],gforth_d2ll(sp[2],sp[1]),sp[0]),sp[3],sp[2]);
 \   long arg2;  \   gforth_SP = sp+2;
 \   int arg3;  
 \   long result;  
 \   func = (char *)((Cell *)sp)[0];  
 \   arg3 = ((Cell *)sp)[1];  
 \   arg2 = gforth_d2ll(sp[3],sp[2]);  
 \   arg1 = ((Cell *)sp)[4];  
 \   result = func(arg1, arg2, arg3);  
 \   gforth_ll2d(result, sp[4], sp[3]);  
 \   gforth_SP += 3;  
 \ }  \ }
   
 \ Then it compiles this code and dynamically links it into the Gforth  \ Then it compiles this code and dynamically links it into the Gforth
 \ system (batching and caching are future work).  It also dynamically  \ system (batching and caching are future work).  It also dynamically
 \ links lseek.  Performing DLSEEK then puts the function pointer of  \ links lseek.  Performing DLSEEK then puts the function pointer of
 \ lseek() on the stack, the function pointer of  \ the function pointer of gforth_c_lseek_ndn_d on the stack and
 \ gforth_call_del_i_dl_i, and calls CALL-C.  \ calls CALL-C.
   
   \ other things to do:
   
   \ c-variable forth-name c-name
   \ c-constant forth-name c-name
   
   
   \ data structures
   
   \ c-function word body:
   \  cell function pointer
   \  char return type index
   \  char parameter count n
   \  char*n parameters (type indices)
   \  counted string: c-name
   
   : .n ( n -- )
       0 .r ;
   
   : const+ ( n1 "name" -- n2 )
       dup constant 1+ ;
   
   wordlist constant libcc-types
   
   get-current libcc-types set-current
   
   \ index values
   -1
   const+ -- \ end of arguments
   const+ n \ integer cell
   const+ p \ pointer cell
   const+ d \ double
   const+ r \ float
   const+ func \ C function pointer
   const+ void
   drop
   
   set-current
   
   : parse-libcc-type ( "libcc-type" -- u )
       parse-name libcc-types search-wordlist 0= -13 and throw execute ;
   
   : parse-function-types ( "{libcc-type}" "--" "libcc-type" -- )
       here 2 chars allot here begin
           parse-libcc-type dup 0>= while
               c,
       repeat
       drop swap - over char+ c!
       parse-libcc-type 0< -32 and throw swap c! ;
   
   : type-letter ( n -- c )
       chars s" npdrfv" drop + c@ ;
   
   \ count-stacks
   
   : count-stacks-n ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
       1+ ;
   
   : count-stacks-p ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
       1+ ;
   
   : count-stacks-d ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
       2 + ;
   
   : count-stacks-r ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
       swap 1+ swap ;
   
   : count-stacks-func ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
       1+ ;
   
   : count-stacks-void ( fp-change1 sp-change1 -- fp-change2 sp-change2 )
   ;
   
   create count-stacks-types
   ' count-stacks-n ,
   ' count-stacks-p ,
   ' count-stacks-d ,
   ' count-stacks-r ,
   ' count-stacks-func ,
   ' count-stacks-void ,
   
   : count-stacks ( pars -- fp-change sp-change )
       \ pars is an addr u pair
       0 0 2swap over + swap u+do
           i c@ cells count-stacks-type + @ execute
       loop ;
   
   \ gen-pars
   
   : gen-par-n ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       1- dup ." sp[" .n ." ]" ;
   
   : gen-par-p ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       ." (void *)(" gen-par-n ." )" ;
   
   : gen-par-d ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       ." gforthd2ll(" gen-par-n ." ," gen-par-n ." )" ;
   
   : gen-par-r ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       swap 1- tuck ." fp[" .n ." ]" ;
   
   : gen-par-func ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       gen-par-p ;
   
   : gen-par-void ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 )
       -32 throw ;
   
   create gen-par-types
   ' gen-par-n ,
   ' gen-par-p ,
   ' gen-par-d ,
   ' gen-par-r ,
   ' gen-par-func ,
   ' gen-par-void ,
   
   : gen-par ( fp-depth1 sp-depth1 partype -- fp-depth2 sp-depth2 )
       cells gen-par-types @ execute ;
   
   \ the call itself
   
   : gen-wrapped-call { d: pars d: c-name fp-change1 sp-change1 -- }
       c-name type ." ("
       fp-change1 sp-change1 pars over + swap u+do
           i c@ gen-par
           i 1+ i' < if
               ." ,"
           endif
       loop
       2drop ." )" ;
   
   \ calls for various kinds of return values
   
   : gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change )
       2dup 2>r gen-wrapped-call 2r> ;
   
   create gen-wrapped-types
   ' gen-wrapped-n ,
   ' gen-wrapped-p ,
   ' gen-wrapped-d ,
   ' gen-wrapped-r ,
   ' gen-wrapped-func ,
   ' gen-wrapped-void ,
   
   : gen-wrapped-stmt ( pars c-name fp-change1 sp-change1 ret -- fp-change sp-change )
       cells gen-wrapped-types @ execute ;
   
   : gen-wrapper-function ( addr -- )
       \ addr points to the return type index of a c-function descriptor
       c@+ { ret } count 2dup { d: pars } chars + count { d: c-name }
       ." void gforth_c_" c-name type ." _"
       pars 0 +do
           i chars over + c@ type-letter emit
       loop
       ." _" ret type-letter emit .\" (void)\n"
       .\" {\n  Cell *sp = gforth_SP;\n  Float *fp = gforth_FP;"
       pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n"
       ?dup-if
           ."   gforth_SP = sp+" .n .\" ;\n"
       endif
       ?dup-if
           ."   gforth_FP = fp+" .n .\" ;\n"
       endif
       ." }\n" ;
   
   : c-function ( "forth-name" "c-name" "{libcc-type}" "--" "libcc-type" -- )
       create here >r 0 , \ place for the wrapper function pointer
       parse-name { d: c-name }
       parse-function-types c-name string,
       r> cell+ gen-wrapper-function
       compile-wrapper-function
       link-wrapper-function
       r> !
     does> ( ... -- ... )
       @ call-c ;
   
   
   
   
   
 s" Library not found" exception constant err-nolib  s" Library not found" exception constant err-nolib
Removed from v.1.1  
changed lines
  Added in v.1.2

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