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yap-6.3/C/load_foreign.c
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git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@5 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2001-04-09 19:54:03 +00:00

144 lines
3.1 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_foreign.c *
* comments: dynamic loader of external routines *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%.2";
#endif
#include "Yap.h"
#include "Yatom.h"
#include "Heap.h"
#include "yapio.h"
#include <stdlib.h>
#if HAVE_STRING_H
#include <string.h>
#endif
#include "Foreign.h"
#if _WIN32
#ifndef SHLIB_SUFFIX
#define SHLIB_SUFFIX "dll"
#endif
#endif
char LoadMsg[512];
char YapExecutable[YAP_FILENAME_MAX];
STD_PROTO(Int p_load_foreign, (void));
Int
p_load_foreign(void)
{
StringList ofiles = NIL;
StringList libs = NIL;
char *InitProcName;
YapInitProc InitProc = NULL;
Term t, t1;
StringList new;
Int returncode = FALSE;
strcpy(LoadMsg,"Invalid arguments");
/* collect the list of object files */
t = Deref(ARG1);
while(1) {
if (t == TermNil) break;
t1 = HeadOfTerm(t);
t = TailOfTerm(t);
new = (StringList) AllocCodeSpace(sizeof(StringListItem));
new->next = ofiles;
new->s = RepAtom(AtomOfTerm(t1))->StrOfAE;
ofiles = new;
}
/* collect the list of library files */
t = Deref(ARG2);
while(1) {
if (t == TermNil) break;
t1 = HeadOfTerm(t);
t = TailOfTerm(t);
new = (StringList) AllocCodeSpace(sizeof(StringListItem));
new->next = libs;
new->s = RepAtom(AtomOfTerm(t1))->StrOfAE;
libs = new;
}
/* get the initialization function name */
t1 = Deref(ARG3);
InitProcName = RepAtom(AtomOfTerm(t1))->StrOfAE;
/* call the OS specific function for dynamic loading */
if(LoadForeign(ofiles,libs,InitProcName,&InitProc)==LOAD_SUCCEEDED) {
(*InitProc)();
returncode = TRUE;
}
/* I should recover space if load foreign fails */
if (returncode == TRUE) {
ForeignObj *f_code = (ForeignObj *)AllocCodeSpace(sizeof(ForeignObj));
f_code->objs = ofiles;
f_code->libs = libs;
f_code->f = InitProcName;
f_code->next = ForeignCodeLoaded;
f_code->module = CurrentModule;
ForeignCodeLoaded = (void *)f_code;
}
return returncode;
}
static Int
p_obj_suffix(void) {
return(unify(StringToList(SHLIB_SUFFIX),ARG1));
}
void
InitLoadForeign(void)
{
if (yap_args == NULL)
YAPFindExecutable(NULL);
else
YAPFindExecutable(yap_args[0]);
InitCPred("$load_foreign_files", 3, p_load_foreign, SafePredFlag|SyncPredFlag);
InitCPred("$obj_suffix", 1, p_obj_suffix, SafePredFlag);
}
void
ReOpenLoadForeign(void)
{
ForeignObj *f_code = ForeignCodeLoaded;
int OldModule = CurrentModule;
YapInitProc InitProc = NULL;
while (f_code != NULL) {
CurrentModule = f_code->module;
if(ReLoadForeign(f_code->objs,f_code->libs,f_code->f,&InitProc)==LOAD_SUCCEEDED) {
(*InitProc)();
}
f_code = f_code->next;
}
CurrentModule = OldModule;
}