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yap-6.3/C/modules.c
vsc 6c626484f0 fix module stuff (at last)
debugger should call goal_expansion in spycalls.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@679 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
2002-11-12 00:33:48 +00:00

152 lines
3.6 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: modules.c *
* Last rev: *
* mods: *
* comments: module support *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
#include "Yap.h"
#include "Yatom.h"
#include "Heap.h"
STATIC_PROTO(Int p_current_module, (void));
STATIC_PROTO(Int p_current_module1, (void));
#define ByteAdr(X) ((char *) &(X))
Term
_YAP_Module_Name(CODEADDR cap)
{
PredEntry *ap = (PredEntry *)cap;
if (!ap->ModuleOfPred)
/* If the system predicate is a metacall I should return the
module for the metacall, which I will suppose has to be
reachable from the current module anyway.
So I will return the current module in case the system
predicate is a meta-call. Otherwise it will still work.
*/
return(ModuleName[CurrentModule]);
else {
return (ModuleName[ap->ModuleOfPred]);
}
}
static SMALLUNSGN
LookupModule(Term a)
{
unsigned int i;
for (i = 0; i < NoOfModules; ++i) {
if (ModuleName[i] == a) {
return (i);
}
}
ModuleName[i = NoOfModules++] = a;
if (NoOfModules == MaxModules) {
_YAP_Error(SYSTEM_ERROR,a,"number of modules overflowed");
}
return (i);
}
SMALLUNSGN
_YAP_LookupModule(Term a)
{
return(LookupModule(a));
}
static Int
p_current_module(void)
{ /* $current_module(Old,New) */
Term t;
if (!_YAP_unify_constant(ARG1, ModuleName[CurrentModule]))
return (0);
t = Deref(ARG2);
if (IsVarTerm(t) || !IsAtomTerm(t))
return (0);
CurrentModule = LookupModule(t);
return (TRUE);
}
static Int
p_current_module1(void)
{ /* $current_module(Old) */
if (!_YAP_unify_constant(ARG1, ModuleName[CurrentModule]))
return (0);
return (1);
}
static Int
p_change_module(void)
{ /* $change_module(New) */
SMALLUNSGN mod = LookupModule(Deref(ARG1));
CurrentModule = mod;
return (TRUE);
}
static Int
p_module_number(void)
{ /* $module_number(Mod,Num) */
Term tname = Deref(ARG1);
Term t;
if (IsVarTerm(tname)) {
return(_YAP_unify(tname, ModuleName[IntOfTerm(Deref(ARG2))]));
}else {
t = MkIntTerm(LookupModule(Deref(ARG1)));
_YAP_unify(t,ARG2);
ARG2 = t;
}
return(TRUE);
}
static Int
cont_current_module(void)
{
Int mod = IntOfTerm(EXTRA_CBACK_ARG(1,1));
Term t = ModuleName[mod];
if (mod == NoOfModules) {
cut_fail();
}
EXTRA_CBACK_ARG(1,1) = MkIntTerm(mod+1);
return(_YAP_unify(ARG1,t));
}
static Int
init_current_module(void)
{ /* current_module(?ModuleName) */
EXTRA_CBACK_ARG(1,1) = MkIntTerm(0);
return (cont_current_module());
}
void
_YAP_InitModules(void)
{
ModuleName[PrimitivesModule = 0] =
MkAtomTerm(_YAP_LookupAtom("prolog"));
ModuleName[1] =
MkAtomTerm(_YAP_LookupAtom("user"));
NoOfModules = 2;
CurrentModule = 0;
_YAP_InitCPred("$current_module", 2, p_current_module, SafePredFlag|SyncPredFlag);
_YAP_InitCPred("$current_module", 1, p_current_module1, SafePredFlag|SyncPredFlag);
_YAP_InitCPred("$change_module", 1, p_change_module, SafePredFlag|SyncPredFlag);
_YAP_InitCPred("$module_number", 2, p_module_number, SafePredFlag);
_YAP_InitCPredBack("$all_current_modules", 1, 1, init_current_module, cont_current_module,
SafePredFlag|SyncPredFlag);
}