| |
|
| \ 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 |
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|
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\ c-function dlseek lseek n d n -- d |
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|
| \ 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: |
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|
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\ c-variable forth-name c-name |
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\ c-constant forth-name c-name |
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|
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|
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\ data structures |
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|
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\ c-function word body: |
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\ cell function pointer |
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\ char return type index |
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\ char parameter count n |
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\ char*n parameters (type indices) |
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\ counted string: c-name |
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|
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: .n ( n -- ) |
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0 .r ; |
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|
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: const+ ( n1 "name" -- n2 ) |
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dup constant 1+ ; |
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|
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wordlist constant libcc-types |
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|
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get-current libcc-types set-current |
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|
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\ index values |
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-1 |
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const+ -- \ end of arguments |
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const+ n \ integer cell |
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const+ p \ pointer cell |
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const+ d \ double |
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const+ r \ float |
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const+ func \ C function pointer |
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const+ void |
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drop |
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|
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set-current |
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|
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: parse-libcc-type ( "libcc-type" -- u ) |
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parse-name libcc-types search-wordlist 0= -13 and throw execute ; |
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|
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: parse-function-types ( "{libcc-type}" "--" "libcc-type" -- ) |
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here 2 chars allot here begin |
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parse-libcc-type dup 0>= while |
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c, |
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repeat |
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drop swap - over char+ c! |
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parse-libcc-type 0< -32 and throw swap c! ; |
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|
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: type-letter ( n -- c ) |
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chars s" npdrfv" drop + c@ ; |
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|
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\ count-stacks |
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|
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: count-stacks-n ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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|
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: count-stacks-p ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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|
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: count-stacks-d ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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2 + ; |
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|
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: count-stacks-r ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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swap 1+ swap ; |
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|
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: count-stacks-func ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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|
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: count-stacks-void ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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; |
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|
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create count-stacks-types |
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' count-stacks-n , |
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' count-stacks-p , |
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' count-stacks-d , |
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' count-stacks-r , |
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' count-stacks-func , |
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' count-stacks-void , |
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|
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: count-stacks ( pars -- fp-change sp-change ) |
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\ pars is an addr u pair |
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0 0 2swap over + swap u+do |
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i c@ cells count-stacks-type + @ execute |
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loop ; |
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|
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\ gen-pars |
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|
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: gen-par-n ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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1- dup ." sp[" .n ." ]" ; |
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|
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: gen-par-p ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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." (void *)(" gen-par-n ." )" ; |
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|
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: gen-par-d ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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." gforthd2ll(" gen-par-n ." ," gen-par-n ." )" ; |
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|
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: gen-par-r ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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swap 1- tuck ." fp[" .n ." ]" ; |
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|
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: gen-par-func ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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gen-par-p ; |
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|
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: gen-par-void ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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-32 throw ; |
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|
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create gen-par-types |
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' gen-par-n , |
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' gen-par-p , |
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' gen-par-d , |
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' gen-par-r , |
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' gen-par-func , |
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' gen-par-void , |
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|
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: gen-par ( fp-depth1 sp-depth1 partype -- fp-depth2 sp-depth2 ) |
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cells gen-par-types @ execute ; |
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|
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\ the call itself |
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|
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: gen-wrapped-call { d: pars d: c-name fp-change1 sp-change1 -- } |
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c-name type ." (" |
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fp-change1 sp-change1 pars over + swap u+do |
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i c@ gen-par |
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i 1+ i' < if |
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." ," |
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endif |
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loop |
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2drop ." )" ; |
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|
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\ calls for various kinds of return values |
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|
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: gen-wrapped-void ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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2dup 2>r gen-wrapped-call 2r> ; |
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|
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create gen-wrapped-types |
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' gen-wrapped-n , |
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' gen-wrapped-p , |
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' gen-wrapped-d , |
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' gen-wrapped-r , |
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' gen-wrapped-func , |
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' gen-wrapped-void , |
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|
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: gen-wrapped-stmt ( pars c-name fp-change1 sp-change1 ret -- fp-change sp-change ) |
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cells gen-wrapped-types @ execute ; |
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|
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: gen-wrapper-function ( addr -- ) |
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\ addr points to the return type index of a c-function descriptor |
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c@+ { ret } count 2dup { d: pars } chars + count { d: c-name } |
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." void gforth_c_" c-name type ." _" |
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pars 0 +do |
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i chars over + c@ type-letter emit |
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loop |
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." _" ret type-letter emit .\" (void)\n" |
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.\" {\n Cell *sp = gforth_SP;\n Float *fp = gforth_FP;" |
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pars c-name 2over count-stacks ret gen-wrapped-stmt .\" ;\n" |
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?dup-if |
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." gforth_SP = sp+" .n .\" ;\n" |
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endif |
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?dup-if |
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." gforth_FP = fp+" .n .\" ;\n" |
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endif |
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." }\n" ; |
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|
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: 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 } |
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parse-function-types c-name string, |
| |
r> cell+ gen-wrapper-function |
| |
compile-wrapper-function |
| |
link-wrapper-function |
| |
r> ! |
| |
does> ( ... -- ... ) |
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@ call-c ; |
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|
| s" Library not found" exception constant err-nolib |
s" Library not found" exception constant err-nolib |
