version 1.1, 2006/04/08 19:32:41
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version 1.36, 2008/06/17 20:18:11
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\ libcc.fs foreign function interface implemented using a C compiler |
\ libcc.fs foreign function interface implemented using a C compiler |
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\ Copyright (C) 2006 Free Software Foundation, Inc. |
\ Copyright (C) 2006,2007 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
\ Gforth is free software; you can redistribute it and/or |
\ modify it under the terms of the GNU General Public License |
\ modify it under the terms of the GNU General Public License |
\ as published by the Free Software Foundation; either version 2 |
\ as published by the Free Software Foundation, either version 3 |
\ of the License, or (at your option) any later version. |
\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
\ This program is distributed in the hope that it will be useful, |
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\ GNU General Public License for more details. |
\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program. If not, see http://www.gnu.org/licenses/. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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\ What this implementation does is this: if it sees a declaration like |
\ What this implementation does is this: if it sees a declaration like |
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\ libc dlseek int dlong int (dlong) lseek ( fd doffset whence -- doffset2 ) |
\ \ something that tells it that the current library is libc |
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\ \c #include <unistd.h> |
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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: |
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\ #include <gforth.h> |
\ #include <gforth.h> |
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\ #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; |
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\ long result; |
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\ func = (char *)((Cell *)sp)[0]; |
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\ arg3 = ((Cell *)sp)[1]; |
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\ arg2 = gforth_d2ll(sp[3],sp[2]); |
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\ arg1 = ((Cell *)sp)[4]; |
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\ result = func(arg1, arg2, arg3); |
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\ gforth_ll2d(result, sp[4], sp[3]); |
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\ gforth_SP += 3; |
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\ } |
\ } |
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\ 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. |
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\ ToDo: |
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s" Library not found" exception constant err-nolib |
\ Batching, caching and lazy evaluation: |
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: library ( "name" "file" -- ) \ gforth |
\ Batching: |
\G Dynamically links the library specified by @i{file}. Defines a |
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\G word @i{name} ( -- lib ) that starts the declaration of a |
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\G function from that library. |
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create parse-name open-lib dup 0= err-nolib and throw , |
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does> ( -- lib ) |
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@ ; |
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\ New words are deferred, and the corresponding C functions are |
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\ collected in one file, until the first word is EXECUTEd; then the |
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\ file is compiled and linked into the system, and the word is |
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\ resolved. |
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\ Caching: |
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\ Instead of compiling all this stuff anew for every execution, we |
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\ keep the files around and have an index file containing the function |
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\ names and their corresponding .so files. If the needed wrapper name |
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\ is already present, it is just linked instead of generating the |
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\ wrapper again. This is all done by loading the index file(s?), |
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\ which define words for the wrappers in a separate wordlist. |
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\ The files are built in .../lib/gforth/$VERSION/libcc/ or |
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\ ~/.gforth/libcc/$HOST/. |
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\ other things to do: |
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\ c-variable forth-name c-name |
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\ c-constant forth-name c-name |
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\ Todo: conversion between function pointers and xts (both directions) |
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\ taking an xt and turning it into a function pointer: |
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\ e.g., assume we have the xt of + and want to create a C function int |
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\ gforth_callback_plus(int, int), and then pass the pointer to that |
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\ function: |
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\ There should be Forth code like this: |
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\ ] + 0 (bye) |
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\ Assume that the start of this code is START |
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\ Now, there should be a C function: |
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\ int gforth_callback_plus(int p1, int p2) |
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\ { |
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\ Cell *sp = gforth_SP; |
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\ Float *fp = gforth_FP; |
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\ Float *fp = gforth_FP; |
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\ Address lp = gforth_LP; |
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\ sp -= 2; |
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\ sp[0] = p1; |
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\ sp[1] = p2; |
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\ gforth_engine(START, sp, rp, fp, lp); |
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\ sp += 1; |
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\ gforth_RP = rp; |
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\ gforth_SP = sp; |
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\ gforth_FP = fp; |
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\ gforth_LP = lp; |
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\ return sp[0]; |
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\ } |
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\ and the pointer to that function is the C function pointer for the XT of +. |
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\ Future problems: |
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\ how to combine the Forth code generation with inlining |
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\ START is not a constant across executions (when caching the C files) |
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\ Solution: make START a variable, and store into it on startup with dlsym |
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\ Syntax: |
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\ callback <rettype> <params> <paramtypes> -- <rettype> |
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\ data structures |
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\ For every c-function, we have three words: two anonymous words |
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\ created by c-function-ft (first time) and c-function-rt (run-time), |
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\ and a named deferred word. The deferred word first points to the |
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\ first-time word, then to the run-time word; the run-time word calls |
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\ the c function. |
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[ifundef] parse-name |
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' parse-word alias parse-name |
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[then] |
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[ifundef] defer! |
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: defer! ( xt xt-deferred -- ) \ gforth defer-store |
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\G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}. |
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>body [ has? rom [IF] ] @ [ [THEN] ] ! ; |
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[then] |
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\ : delete-file 2drop 0 ; |
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require struct.fs |
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\ counted-string |
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\ c-function-ft word body: |
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struct |
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cell% field cff-cfr \ xt of c-function-rt word |
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cell% field cff-deferred \ xt of c-function deferred word |
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cell% field cff-lha \ address of the lib-handle for the lib that |
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\ contains the wrapper function of the word |
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char% field cff-rtype \ return type |
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char% field cff-np \ number of parameters |
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1 0 field cff-ptypes \ #npar parameter types |
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\ counted string: c-name |
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end-struct cff% |
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variable c-source-file-id \ contains the source file id of the current batch |
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0 c-source-file-id ! |
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variable lib-handle-addr \ points to the library handle of the current batch. |
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\ the library handle is 0 if the current |
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\ batch is not yet compiled. |
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2variable lib-filename \ filename without extension |
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2variable lib-modulename \ basename of the file without extension |
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: delete-file 2drop 0 ; |
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: .nb ( n -- ) |
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0 .r ; |
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: const+ ( n1 "name" -- n2 ) |
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dup constant 1+ ; |
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: front-string { c-addr1 u1 c-addr2 u2 -- c-addr3 u3 } |
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\ insert string c-addr2 u2 in buffer c-addr1 u1; c-addr3 u3 is the |
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\ remainder of the buffer. |
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assert( u1 u2 u>= ) |
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c-addr2 c-addr1 u2 move |
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c-addr1 u1 u2 /string ; |
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: front-char { c-addr1 u1 c -- c-addr3 u2 } |
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\ insert c in buffer c-addr1 u1; c-addr3 u3 is the remainder of |
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\ the buffer. |
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assert( u1 0 u> ) |
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c c-addr1 c! |
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c-addr1 u1 1 /string ; |
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: s+ { addr1 u1 addr2 u2 -- addr u } |
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u1 u2 + allocate throw { addr } |
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addr1 addr u1 move |
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addr2 addr u1 + u2 move |
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addr u1 u2 + |
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; |
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: append { addr1 u1 addr2 u2 -- addr u } |
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addr1 u1 u2 + dup { u } resize throw { addr } |
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addr2 addr u1 + u2 move |
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addr u ; |
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\ linked list stuff (should go elsewhere) |
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struct |
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cell% field list-next |
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1 0 field list-payload |
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end-struct list% |
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: list-insert { node list -- } |
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list list-next @ node list-next ! |
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node list list-next ! ; |
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: list-append { node endlistp -- } |
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\ insert node at place pointed to by endlistp |
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node endlistp @ list-insert |
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node list-next endlistp ! ; |
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: list-map ( ... list xt -- ... ) |
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\ xt ( ... node -- ... ) |
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{ xt } begin { node } |
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node while |
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node xt execute |
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node list-next @ |
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repeat ; |
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\ linked libraries |
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list% |
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cell% 2* field c-lib-string |
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end-struct c-lib% |
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variable c-libs \ linked list of library names (without "lib") |
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: add-lib ( c-addr u -- ) |
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\G Add library lib@i{string} to the list of libraries, where |
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\G @i{string} is represented by @i{c-addr u}. |
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c-lib% %size allocate throw dup >r |
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c-lib-string 2! |
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r> c-libs list-insert ; |
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: append-l ( c-addr1 u1 node -- c-addr2 u2 ) |
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\ append " -l<nodelib>" to string1 |
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>r s" -l" append r> c-lib-string 2@ append ; |
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\ C prefix lines |
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\ linked list of longcstrings: [ link | count-cell | characters ] |
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list% |
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cell% field c-prefix-count |
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1 0 field c-prefix-chars |
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end-struct c-prefix% |
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variable c-prefix-lines 0 c-prefix-lines ! |
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variable c-prefix-lines-end c-prefix-lines c-prefix-lines-end ! |
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: print-c-prefix-line ( node -- ) |
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dup c-prefix-chars swap c-prefix-count @ type cr ; |
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: print-c-prefix-lines ( -- ) |
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c-prefix-lines @ ['] print-c-prefix-line list-map ; |
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: save-c-prefix-line ( c-addr u -- ) |
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c-source-file-id @ ?dup-if |
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>r 2dup r> write-line throw |
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then |
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align here 0 , c-prefix-lines-end list-append ( c-addr u ) |
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longstring, ; |
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: \c ( "rest-of-line" -- ) \ gforth backslash-c |
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\G One line of C declarations for the C interface |
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-1 parse save-c-prefix-line ; |
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s" #include <gforth/" version-string s+ s" /libcc.h>" append ( c-addr u ) |
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2dup save-c-prefix-line drop free throw |
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\ Types (for parsing) |
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wordlist constant libcc-types |
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get-current libcc-types set-current |
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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+ a \ address 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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set-current |
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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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: 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 here swap - over char+ c! |
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parse-libcc-type dup 0< -32 and throw swap c! ; |
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: type-letter ( n -- c ) |
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chars s" nadrfv" drop + c@ ; |
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\ count-stacks |
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: count-stacks-n ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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: count-stacks-a ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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: count-stacks-d ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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2 + ; |
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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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: count-stacks-func ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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1+ ; |
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: count-stacks-void ( fp-change1 sp-change1 -- fp-change2 sp-change2 ) |
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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-a , |
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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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: 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-types + @ execute |
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loop ; |
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\ gen-pars |
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: gen-par-n ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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." sp[" 1- dup .nb ." ]" ; |
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: gen-par-a ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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." (void *)(" gen-par-n ." )" ; |
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: gen-par-d ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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." gforth_d2ll(" gen-par-n ." ," gen-par-n ." )" ; |
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: gen-par-r ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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swap 1- tuck ." fp[" .nb ." ]" ; |
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: gen-par-func ( fp-depth1 sp-depth1 -- fp-depth2 sp-depth2 ) |
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gen-par-a ; |
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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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create gen-par-types |
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' gen-par-n , |
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' gen-par-a , |
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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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: gen-par ( fp-depth1 sp-depth1 partype -- fp-depth2 sp-depth2 ) |
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cells gen-par-types + @ execute ; |
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\ the call itself |
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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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\ calls for various kinds of return values |
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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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: gen-wrapped-n ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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2dup gen-par-n 2>r ." =" gen-wrapped-call 2r> ; |
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: gen-wrapped-a ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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2dup gen-par-n 2>r ." =(Cell)" gen-wrapped-call 2r> ; |
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: gen-wrapped-d ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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." gforth_ll2d(" gen-wrapped-void |
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." ," gen-par-n ." ," gen-par-n ." )" ; |
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: gen-wrapped-r ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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2dup gen-par-r 2>r ." =" gen-wrapped-call 2r> ; |
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: gen-wrapped-func ( pars c-name fp-change1 sp-change1 -- fp-change sp-change ) |
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gen-wrapped-a ; |
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create gen-wrapped-types |
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' gen-wrapped-n , |
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' gen-wrapped-a , |
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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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: 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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: wrapper-function-name ( addr -- c-addr u ) |
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\ addr points to the return type index of a c-function descriptor |
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count { r-type } count { d: pars } |
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pars + count { d: c-name } |
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s" gforth_c_" { d: prefix } |
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prefix nip c-name nip + pars nip + 3 + { u } |
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u allocate throw { c-addr } |
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c-addr u |
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prefix front-string c-name front-string '_ front-char |
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pars bounds u+do |
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i c@ type-letter front-char |
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loop |
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'_ front-char r-type type-letter front-char assert( dup 0= ) |
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2drop c-addr u ; |
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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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dup { descriptor } |
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count { ret } count 2dup { d: pars } chars + count { d: c-name } |
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." void " lib-modulename 2@ type ." _LTX_" descriptor wrapper-function-name 2dup type drop free throw |
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.\" (void)\n" |
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.\" {\n Cell MAYBE_UNUSED *sp = gforth_SP;\n Float MAYBE_UNUSED *fp = gforth_FP;\n " |
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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+" .nb .\" ;\n" |
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endif |
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?dup-if |
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." gforth_FP = fp+" .nb .\" ;\n" |
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endif |
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.\" }\n" ; |
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: open-wrappers ( -- addr ) |
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lib-filename 2@ s" .la" s+ |
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2dup open-lib >r |
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drop free throw r> ; |
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: tempdir ( -- c-addr u ) |
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s" TMPDIR" getenv dup 0= if |
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2drop s" /tmp" |
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then ; |
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: gen-filename ( x -- c-addr u ) |
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\ generates a file basename for lib-handle-addr X |
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0 <<# ['] #s $10 base-execute #> |
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s" gforth_c_" 2swap s+ #>> ; |
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: prepend-dirname ( c-addr1 u1 -- c-addr2 u2 ) |
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tempdir s" /" s+ 2over append |
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2swap drop free throw ; |
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: c-library-name1 ( c-addr u -- ) |
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\ set up filenames for a new library; c-addr u is the basename of |
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\ the library |
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assert( c-source-file-id @ 0= ) |
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prepend-dirname { d: filename } |
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here 0 , lib-handle-addr ! filename 2dup lib-filename 2! |
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2dup tempdir nip 1+ /string lib-modulename 2! |
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s" .c" s+ 2dup w/o create-file throw dup c-source-file-id ! |
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['] print-c-prefix-lines swap outfile-execute |
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drop free throw ; |
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: init-c-source-file ( -- ) |
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c-source-file-id @ 0= if |
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here gen-filename c-library-name1 |
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endif ; |
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: c-source-file ( -- file-id ) |
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c-source-file-id @ assert( dup ) ; |
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: .lib-error ( -- ) |
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[ifdef] lib-error |
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['] cr stderr outfile-execute |
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lib-error ['] type stderr outfile-execute |
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[then] ; |
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DEFER compile-wrapper-function ( -- ) |
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: compile-wrapper-function1 ( -- ) |
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c-source-file close-file throw |
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0 c-source-file-id ! |
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[ libtool-command s" --silent --mode=compile gcc -I " s+ |
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s" includedir" getenv append ] sliteral |
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s" -O -c " s+ lib-filename 2@ append s" .c -o " append |
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lib-filename 2@ append s" .lo" append ( c-addr u ) |
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\ cr 2dup type |
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2dup system drop free throw $? abort" libtool compile failed" |
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[ libtool-command s" --silent --mode=link gcc -module -rpath " s+ ] sliteral |
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tempdir s+ s" " append |
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lib-filename 2@ append s" .lo -o " append |
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lib-filename 2@ append s" .la" append ( c-addr u ) |
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c-libs @ ['] append-l list-map |
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\ 2dup type cr |
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2dup system drop free throw $? abort" libtool link failed" |
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open-wrappers |
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dup 0= if |
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.lib-error true abort" open-lib failed" |
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endif |
|
( lib-handle ) lib-handle-addr @ ! |
|
lib-filename 2@ drop free throw 0 0 lib-filename 2! ; |
|
' compile-wrapper-function1 IS compile-wrapper-function |
|
\ s" ar rcs xxx.a xxx.o" system |
|
\ $? abort" ar generated error" ; |
|
|
|
: link-wrapper-function { cff -- sym } |
|
cff cff-rtype wrapper-function-name { d: wrapper-name } |
|
wrapper-name cff cff-lha @ @ assert( dup ) lib-sym dup 0= if |
|
.lib-error -&32 throw |
|
endif |
|
wrapper-name drop free throw ; |
|
|
|
: c-function-ft ( xt-defr xt-cfr "c-name" "{libcc-type}" "--" "libcc-type" -- ) |
|
\ build time/first time action for c-function |
|
init-c-source-file |
|
noname create 2, lib-handle-addr @ , |
|
parse-name { d: c-name } |
|
here parse-function-types c-name string, |
|
['] gen-wrapper-function c-source-file outfile-execute |
|
does> ( ... -- ... ) |
|
dup 2@ { xt-defer xt-cfr } |
|
dup cff-lha @ @ 0= if |
|
compile-wrapper-function |
|
endif |
|
link-wrapper-function xt-cfr >body ! |
|
xt-cfr xt-defer defer! |
|
xt-cfr execute ; |
|
|
|
: c-function-rt ( -- ) |
|
\ run-time definition for c function; addr is the address where |
|
\ the sym should be stored |
|
noname create 0 , |
|
does> ( ... -- ... ) |
|
@ call-c ; |
|
|
|
: c-function ( "forth-name" "c-name" "@{type@}" "--" "type" -- ) \ gforth |
|
\G Define a Forth word @i{forth-name}. @i{Forth-name} has the |
|
\G specified stack effect and calls the C function @code{c-name}. |
|
defer lastxt dup c-function-rt lastxt c-function-ft |
|
lastxt swap defer! ; |
|
|
|
: clear-libs ( -- ) |
|
\G Clear the list of libs |
|
c-source-file-id @ if |
|
compile-wrapper-function |
|
endif |
|
0 c-libs ! ; |
|
clear-libs |
|
|
|
: c-library-incomplete ( -- ) |
|
true abort" Called function of unfinished named C library" ; |
|
|
|
: c-library-name ( c-addr u -- ) \ gforth |
|
\G Start a C library with name @i{c-addr u}. |
|
clear-libs |
|
['] c-library-incomplete is compile-wrapper-function |
|
c-library-name1 ; |
|
|
|
: c-library ( "name" -- ) \ gforth |
|
\G Parsing version of @code{c-library-name} |
|
name save-mem c-library-name ; |
|
|
|
: end-c-library ( -- ) |
|
['] compile-wrapper-function1 is compile-wrapper-function |
|
compile-wrapper-function1 ; |