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