6c626484f0
debugger should call goal_expansion in spycalls. git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@679 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
152 lines
3.6 KiB
C
152 lines
3.6 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: modules.c *
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* Last rev: *
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* mods: *
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* comments: module support *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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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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STATIC_PROTO(Int p_current_module, (void));
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STATIC_PROTO(Int p_current_module1, (void));
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#define ByteAdr(X) ((char *) &(X))
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Term
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_YAP_Module_Name(CODEADDR cap)
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{
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PredEntry *ap = (PredEntry *)cap;
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if (!ap->ModuleOfPred)
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/* If the system predicate is a metacall I should return the
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module for the metacall, which I will suppose has to be
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reachable from the current module anyway.
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So I will return the current module in case the system
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predicate is a meta-call. Otherwise it will still work.
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*/
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return(ModuleName[CurrentModule]);
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else {
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return (ModuleName[ap->ModuleOfPred]);
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}
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}
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static SMALLUNSGN
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LookupModule(Term a)
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{
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unsigned int i;
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for (i = 0; i < NoOfModules; ++i) {
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if (ModuleName[i] == a) {
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return (i);
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}
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}
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ModuleName[i = NoOfModules++] = a;
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if (NoOfModules == MaxModules) {
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_YAP_Error(SYSTEM_ERROR,a,"number of modules overflowed");
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}
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return (i);
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}
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SMALLUNSGN
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_YAP_LookupModule(Term a)
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{
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return(LookupModule(a));
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}
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static Int
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p_current_module(void)
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{ /* $current_module(Old,New) */
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Term t;
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if (!_YAP_unify_constant(ARG1, ModuleName[CurrentModule]))
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return (0);
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t = Deref(ARG2);
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if (IsVarTerm(t) || !IsAtomTerm(t))
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return (0);
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CurrentModule = LookupModule(t);
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return (TRUE);
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}
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static Int
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p_current_module1(void)
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{ /* $current_module(Old) */
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if (!_YAP_unify_constant(ARG1, ModuleName[CurrentModule]))
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return (0);
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return (1);
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}
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static Int
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p_change_module(void)
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{ /* $change_module(New) */
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SMALLUNSGN mod = LookupModule(Deref(ARG1));
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CurrentModule = mod;
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return (TRUE);
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}
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static Int
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p_module_number(void)
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{ /* $module_number(Mod,Num) */
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Term tname = Deref(ARG1);
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Term t;
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if (IsVarTerm(tname)) {
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return(_YAP_unify(tname, ModuleName[IntOfTerm(Deref(ARG2))]));
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}else {
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t = MkIntTerm(LookupModule(Deref(ARG1)));
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_YAP_unify(t,ARG2);
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ARG2 = t;
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}
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return(TRUE);
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}
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static Int
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cont_current_module(void)
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{
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Int mod = IntOfTerm(EXTRA_CBACK_ARG(1,1));
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Term t = ModuleName[mod];
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if (mod == NoOfModules) {
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cut_fail();
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}
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EXTRA_CBACK_ARG(1,1) = MkIntTerm(mod+1);
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return(_YAP_unify(ARG1,t));
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}
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static Int
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init_current_module(void)
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{ /* current_module(?ModuleName) */
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EXTRA_CBACK_ARG(1,1) = MkIntTerm(0);
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return (cont_current_module());
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}
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void
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_YAP_InitModules(void)
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{
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ModuleName[PrimitivesModule = 0] =
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MkAtomTerm(_YAP_LookupAtom("prolog"));
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ModuleName[1] =
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MkAtomTerm(_YAP_LookupAtom("user"));
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NoOfModules = 2;
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CurrentModule = 0;
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_YAP_InitCPred("$current_module", 2, p_current_module, SafePredFlag|SyncPredFlag);
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_YAP_InitCPred("$current_module", 1, p_current_module1, SafePredFlag|SyncPredFlag);
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_YAP_InitCPred("$change_module", 1, p_change_module, SafePredFlag|SyncPredFlag);
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_YAP_InitCPred("$module_number", 2, p_module_number, SafePredFlag);
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_YAP_InitCPredBack("$all_current_modules", 1, 1, init_current_module, cont_current_module,
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SafePredFlag|SyncPredFlag);
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}
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