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yap-6.3/C/load_dld.c
2002-11-18 18:18:05 +00:00

114 lines
2.6 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_dld.c *
* comments: dld based dynamic loaderr of external routines *
* tested on i486-linuxaout *
*************************************************************************/
#if defined(linux) && !defined(__ELF__) && !defined(__LCC__)
#include "Foreign.h"
#include <dld.h>
#include <malloc.h>
#include <stdio.h>
static char YapExecutable[YAP_FILE_MAX];
/*
* YAP_FindExecutable(argv[0]) should be called on yap initialization to
* locate the executable of Yap
*/
void
Yap_FindExecutable(char *name)
{
/* use dld_find_executable */
char *res;
if(name != NULL && (res=dld_find_executable(name))) {
strcpy(YapExecutable,res);
} else {
strcpy(YapExecutable,"./yap");
}
}
/*
* LoadForeign(ofiles,libs,proc_name,init_proc) dynamically loads foreign
* code files and libraries and locates an initialization routine
*/
static int
LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
static int firstTime = 1;
int error;
if(firstTime) {
error = dld_init(YapExecutable);
if(error) {
strcpy(Yap_ErrorSay,dld_strerror(error));
return LOAD_FAILLED;
}
firstTime=0;
}
while (ofiles) {
if((error=dld_link(ofiles->s)) !=0) {
strcpy(Yap_ErrorSay,dld_strerror(error));
return LOAD_FAILLED;
}
ofiles = ofiles->next;
}
/* TODO: handle libs */
*init_proc = (YapInitProc) dld_get_func(proc_name);
if(! *init_proc) {
strcpy(Yap_ErrorSay,"Could not locate initialization routine");
return LOAD_FAILLED;
}
if(!dld_function_executable_p(proc_name)) {
char **undefs = dld_list_undefined_sym();
char **p = undefs;
int k = dld_undefined_sym_count;
strcpy(Yap_ErrorSay,"Could not resolve all symbols");
while(k) {
YP_printf("[undefined symbol %s]\n",*p++);
--k;
}
free(undefs);
return LOAD_FAILLED;
}
return LOAD_SUCCEEDED;
}
Int
Yap_LoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return LoadForeign(ofiles, libs, proc_name, init_proc);
}
void
Yap_ShutdownLoadForeign(void)
{
}
Int
Yap_ReLoadForeign(StringList ofiles, StringList libs,
char *proc_name, YapInitProc *init_proc)
{
return(LoadForeign(ofiles,libs, proc_name, init_proc));
}
#endif