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yap-6.3/C/load_foreign.c

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/*************************************************************************
* *
* 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 "YapHeap.h"
#include "yapio.h"
#include <stdlib.h>
#if HAVE_STRING_H
#include <string.h>
#endif
#include "Foreign.h"
#if _WIN32 || defined(__CYGWIN__)
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#ifndef YAP_SHLIB_SUFFIX
#define YAP_SHLIB_SUFFIX ".dll"
#endif
#endif
STD_PROTO(Int p_load_foreign, (void));
Int
p_load_foreign(void)
{
StringList ofiles = NULL;
StringList libs = NULL;
char *InitProcName;
YapInitProc InitProc = NULL;
Term t, t1;
StringList new;
Int returncode = FALSE;
strcpy(Yap_ErrorSay,"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) Yap_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) Yap_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(Yap_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 *)Yap_AllocCodeSpace(sizeof(ForeignObj));
f_code->objs = ofiles;
f_code->libs = libs;
f_code->f = InitProcName;
f_code->next = ForeignCodeLoaded;
f_code->module = CurrentModule;
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ForeignCodeLoaded = f_code;
} else {
while (ofiles) {
new = ofiles->next;
Yap_FreeCodeSpace((ADDR)ofiles);
ofiles = new;
}
while (libs) {
new = libs->next;
Yap_FreeCodeSpace((ADDR)libs);
libs = new;
}
}
return returncode;
}
static Int
p_open_shared_object(void) {
Term t = Deref(ARG1);
Term tflags = Deref(ARG2);
char *s;
void *handle;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR,t,"open_shared_object/3");
return FALSE;
}
if (!IsAtomTerm(t)) {
Yap_Error(TYPE_ERROR_ATOM,t,"open_shared_object/3");
return FALSE;
}
if (IsVarTerm(tflags)) {
Yap_Error(INSTANTIATION_ERROR,tflags,"open_shared_object/3");
return FALSE;
}
if (!IsIntegerTerm(tflags)) {
Yap_Error(TYPE_ERROR_INTEGER,tflags,"open_shared_object/3");
return FALSE;
}
s = RepAtom(AtomOfTerm(t))->StrOfAE;
if ((handle = Yap_LoadForeignFile(s, IntegerOfTerm(tflags)))==NULL) {
return FALSE;
} else {
return Yap_unify(MkIntegerTerm((Int)handle),ARG3);
}
}
static Int
p_close_shared_object(void) {
Term t = Deref(ARG1);
void *handle;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR,t,"close_shared_object/1");
return FALSE;
}
if (!IsIntegerTerm(t)) {
Yap_Error(TYPE_ERROR_INTEGER,t,"close_shared_object/1");
return FALSE;
}
handle = (char *)IntegerOfTerm(t);
return Yap_CloseForeignFile(handle);
}
static Int
p_call_shared_object_function(void) {
Term t = Deref(ARG1);
Term tfunc = Deref(ARG2);
Term tmod;
void *handle;
Term OldCurrentModule = CurrentModule;
Int res;
tmod = CurrentModule;
restart:
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR,t,"call_shared_object_function/2");
return FALSE;
} else if (IsApplTerm(t)) {
Functor fun = FunctorOfTerm(t);
if (fun == FunctorModule) {
tmod = ArgOfTerm(1, t);
if (IsVarTerm(tmod) ) {
Yap_Error(INSTANTIATION_ERROR,t,"call_shared_object_function/2");
return FALSE;
}
if (!IsAtomTerm(tmod) ) {
Yap_Error(TYPE_ERROR_ATOM,ARG1,"call_shared_object_function/2");
return FALSE;
}
t = ArgOfTerm(2, t);
goto restart;
}
} else if (!IsIntegerTerm(t)) {
Yap_Error(TYPE_ERROR_INTEGER,t,"call_shared_object_function/2");
return FALSE;
}
handle = (void *)IntegerOfTerm(t);
if (IsVarTerm(tfunc)) {
Yap_Error(INSTANTIATION_ERROR,t,"call_shared_object_function/2");
return FALSE;
}
if (!IsAtomTerm(tfunc)) {
Yap_Error(TYPE_ERROR_ATOM,t,"call_shared_object_function/2/3");
return FALSE;
}
CurrentModule = tmod;
res = Yap_CallForeignFile(handle, RepAtom(AtomOfTerm(tfunc))->StrOfAE);
CurrentModule = OldCurrentModule;
return res;
}
static Int
p_obj_suffix(void) {
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return Yap_unify(Yap_StringToList(YAP_SHLIB_SUFFIX),ARG1);
}
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static Int
p_open_shared_objects(void) {
#ifdef YAP_SHLIB_SUFFIX
return TRUE;
#else
return FALSE;
#endif
}
void
Yap_InitLoadForeign(void)
{
if (Yap_argv == NULL)
Yap_FindExecutable("yap");
else
Yap_FindExecutable(Yap_argv[0]);
Yap_InitCPred("$load_foreign_files", 3, p_load_foreign, SafePredFlag|SyncPredFlag|HiddenPredFlag);
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Yap_InitCPred("$open_shared_objects", 0, p_open_shared_objects, SafePredFlag|HiddenPredFlag);
Yap_InitCPred("$open_shared_object", 3, p_open_shared_object, SyncPredFlag|HiddenPredFlag);
Yap_InitCPred("close_shared_object", 1, p_close_shared_object, SyncPredFlag|SafePredFlag);
Yap_InitCPred("call_shared_object_function", 2, p_call_shared_object_function, SyncPredFlag);
Yap_InitCPred("$obj_suffix", 1, p_obj_suffix, SafePredFlag|HiddenPredFlag);
}
void
Yap_ReOpenLoadForeign(void)
{
ForeignObj *f_code = ForeignCodeLoaded;
Term OldModule = CurrentModule;
YapInitProc InitProc = NULL;
while (f_code != NULL) {
CurrentModule = f_code->module;
if(Yap_ReLoadForeign(f_code->objs,f_code->libs,f_code->f,&InitProc)==LOAD_SUCCEEDED) {
if (InitProc)
(*InitProc)();
}
f_code = f_code->next;
}
CurrentModule = OldModule;
}