fix throw (it should undo bindings).

C/exec.c

@@ -1495,7 +1495,6 @@ init_stack(int arity, CELL *pt, int top, choiceptr saved_b)
 #endif
   YENV[E_CB] = Unsigned (B);
   CP = YESCODE;
-
 }
 
 static Term
@@ -1507,7 +1506,6 @@ do_goal(Term t, yamop *CodeAdr, int arity, CELL *pt, int top)
   init_stack(arity, pt, top, saved_b);
   P = (yamop *) CodeAdr;
   S = CellPtr (RepPredProp (PredPropByFunc (Yap_MkFunctor(AtomCall, 1),0)));	/* A1 mishaps */
-  S = CellPtr (RepPredProp (PredPropByFunc (Yap_MkFunctor(AtomCall, 1),0)));	/* A1 mishaps */
 
   out = exec_absmi(top);
   //  if (out) {
@@ -1879,6 +1877,8 @@ JumpToEnv(Term t) {
   CELL *env;
   choiceptr first_func = NULL, B0 = B;
 
+  if (!Yap_SetGlobalVal(AtomHandleThrow,t))
+    return FALSE;
   do {
     /* find the first choicepoint that may be a catch */
     while (B != NULL && B->cp_ap != pos) {
@@ -1925,8 +1925,6 @@ JumpToEnv(Term t) {
   B->cp_env = (CELL *)env[E_E];
   /* cannot recover Heap because of copy term :-( */
   B->cp_h = H;
-  /* nor can I recover terms */
-  B->cp_tr = TR;
   /* I could backtrack here, but it is easier to leave the unwinding
      to the emulator */
   B->cp_a3 = t;
@@ -2036,6 +2034,7 @@ Yap_InitYaamRegs(void)
   WPP = NULL;
   PREG_ADDR = NULL;
 #endif
+  Yap_AllocateDefaultArena(1024, 2);
   Yap_PreAllocCodeSpace();
 #ifdef CUT_C
   cut_c_initialize();

C/globals.c

@@ -240,31 +240,15 @@ p_default_arena_size(void)
 }
 
 
-static Int
+void
-p_allocate_default_arena(void)
+Yap_AllocateDefaultArena(Int gsize, Int attsize)
 {
-  Term t = Deref(ARG1);
+  GlobalArena = NewArena(gsize, 2, NULL);
-  Term t2 = Deref(ARG2);
-  if (IsVarTerm(t)) {
-    Yap_Error(INSTANTIATION_ERROR,t,"allocate_arena");
-    return FALSE;
-  } else if (!IsIntegerTerm(t)) {
-      Yap_Error(TYPE_ERROR_INTEGER,t,"allocate_arena");
-      return FALSE;
-  }
-  if (IsVarTerm(t2)) {
-    Yap_Error(INSTANTIATION_ERROR,t2,"allocate_arena");
-    return FALSE;
-  } else if (!IsIntegerTerm(t)) {
-      Yap_Error(TYPE_ERROR_INTEGER,t2,"allocate_arena");
-      return FALSE;
-  }
-  GlobalArena = NewArena(IntegerOfTerm(t), 2, NULL);
 #if COROUTINING
-  GlobalDelayArena = NewDelayArena(2);
+  GlobalDelayArena = NewDelayArena(attsize);
 #endif
-  return TRUE;
 }
+
 static void
 adjust_cps(UInt size)
 {
@@ -1186,11 +1170,25 @@ p_nb_linkval(void)
   return TRUE;
 }
 
+int
+Yap_SetGlobalVal(Atom at, Term t0)
+{
+  Term to;
+  GlobalEntry *ge;
+  ge = GetGlobalEntry(at);
+  to = CopyTermToArena(t0, GlobalArena, FALSE, 2, &GlobalArena, &GlobalDelayArena, garena_overflow_size(ArenaPt(GlobalArena)));
+  if (to == 0L)
+    return FALSE;
+  WRITE_LOCK(ge->GRWLock);
+  ge->global=to;
+  WRITE_UNLOCK(ge->GRWLock);
+  return TRUE;
+}
+
 static Int
 p_nb_setval(void)
 {
-  Term t = Deref(ARG1), to;
+  Term t = Deref(ARG1);
-  GlobalEntry *ge;
   if (IsVarTerm(t)) {
     Yap_Error(INSTANTIATION_ERROR,t,"nb_setval");
     return (TermNil);
@@ -1198,14 +1196,7 @@ p_nb_setval(void)
       Yap_Error(TYPE_ERROR_ATOM,t,"nb_setval");
       return (FALSE);
   }
-  ge = GetGlobalEntry(AtomOfTerm(t));
+  return Yap_SetGlobalVal(AtomOfTerm(t), ARG2);
-  to = CopyTermToArena(ARG2, GlobalArena, FALSE, 2, &GlobalArena, &GlobalDelayArena, garena_overflow_size(ArenaPt(GlobalArena)));
-  if (to == 0L)
-    return FALSE;
-  WRITE_LOCK(ge->GRWLock);
-  ge->global=to;
-  WRITE_UNLOCK(ge->GRWLock);
-  return TRUE;
 }
 
 static Int
@@ -2555,7 +2546,6 @@ void Yap_InitGlobals(void)
 {
   Term cm = CurrentModule;
   Yap_InitCPred("$allocate_arena", 2, p_allocate_arena, 0);
-  Yap_InitCPred("$allocate_default_arena", 2, p_allocate_default_arena, 0);
   Yap_InitCPred("arena_size", 1, p_default_arena_size, 0);
   Yap_InitCPred("b_setval", 2, p_b_setval, SafePredFlag);
   Yap_InitCPred("b_getval", 2, p_nb_getval, SafePredFlag);

H/Yapproto.h

@@ -185,6 +185,8 @@ void	STD_PROTO(Yap_inform_profiler_of_clause,(struct yami *,struct yami *,struct
 /* globals.c */
 Term	STD_PROTO(Yap_NewArena,(UInt,CELL *));
 void	STD_PROTO(Yap_InitGlobals,(void));
+int	STD_PROTO(Yap_SetGlobalVal, (Atom, Term));
+void	STD_PROTO(Yap_AllocateDefaultArena, (Int, Int));
 
 /* grow.c */
 Int     STD_PROTO(Yap_total_stack_shift_time,(void));