small compiler change

C/c_interface.c

@@ -1685,7 +1685,6 @@ X_API bool YAP_EnterGoal(PredEntry *pe, CELL *ptr, YAP_dogoalinfo *dgi) {
   // LOCAL_CurSlot);
   dgi->b = LCL0 - (CELL *)B;
   out = Yap_exec_absmi(true, false);
-  RECOVER_MACHINE_REGS();
   if (out) {
     dgi->EndSlot = LOCAL_CurSlot;
     Yap_StartSlots();
@@ -1693,6 +1692,7 @@ X_API bool YAP_EnterGoal(PredEntry *pe, CELL *ptr, YAP_dogoalinfo *dgi) {
     LOCAL_CurSlot =
         dgi->CurSlot; // ignore any slots created within the called goal
   }
+  RECOVER_MACHINE_REGS();
   return out;
 }
 
@@ -1702,24 +1702,26 @@ X_API bool YAP_RetryGoal(YAP_dogoalinfo *dgi) {
   bool out;
 
   BACKUP_MACHINE_REGS();
-  myB = (choiceptr)(LCL0 - dgi->b);
+    printf("before RETRY H=%p, ASP=%p, B=%p, ENV=%p, TR=%p %ld\n", HR, ASP, B, ENV, TR, LOCAL_CurSlot);
+    myB = (choiceptr)(LCL0 - dgi->b);
   CP = myB->cp_cp;
   /* sanity check */
   if (B >= myB) {
-    return FALSE;
+    return false;
   }
   P = FAILCODE;
   /* make sure we didn't leave live slots when we backtrack */
   ASP = (CELL *)B;
   LOCAL_CurSlot = dgi->EndSlot;
   out = run_emulator(PASS_REGS1);
-  RECOVER_MACHINE_REGS();
+    printf("out=%d RETRY H=%p, ASP=%p, B=%p, ENV=%p, TR=%p %ld\n", out, HR, ASP, B, ENV, TR, LOCAL_CurSlot);
-  if (out) {
+    if (out) {
     dgi->EndSlot = LOCAL_CurSlot;
   } else {
     LOCAL_CurSlot =
         dgi->CurSlot; // ignore any slots created within the called goal
   }
+  RECOVER_MACHINE_REGS();
   return out;
 }
 
@@ -1729,7 +1731,7 @@ X_API bool YAP_LeaveGoal(bool backtrack, YAP_dogoalinfo *dgi) {
 
   BACKUP_MACHINE_REGS();
   myB = (choiceptr)(LCL0 - dgi->b);
-  if (B > myB) {
+  if (B < myB) {
     /* someone cut us */
     return FALSE;
   }
@@ -2342,7 +2344,7 @@ YAP_file_type_t YAP_Init(YAP_init_args *yap_init) {
 #endif /* YAPOR_COPY || YAPOR_COW || YAPOR_SBA */
   //  GLOBAL_PrologShouldHandleInterrupts =
   //  yap_init->PrologShouldHandleInterrupts &&
-  if (!yap_init->Embedded)
+  if (!yap_init->Embedded) {
     Yap_InitSysbits(0); /* init signal handling and time, required by later
                         functions */
   GLOBAL_argv = yap_init->Argv;
@@ -2353,6 +2355,7 @@ YAP_file_type_t YAP_Init(YAP_init_args *yap_init) {
   } else {
     yroot = BootFilePath;
   }
+  }
   if (yap_init->SavedState == NULL) {
     yap_init->SavedState = YAP_STARTUP;
   }
@@ -2361,7 +2364,7 @@ YAP_file_type_t YAP_Init(YAP_init_args *yap_init) {
   if (yap_init->SavedState == NULL)
     yap_init->SavedState = YAP_STARTUP;
 #else
-  yap_init->SavedState = Yap_findFile(yap_init->SavedState, YAP_STARTUP, yroot,
+  yap_init->SavedState = Yap_findFile(yap_init->SavedState, YAP_STARTUP, yap_init->YapLibDir,
                                       boot_file, true, YAP_QLY, true, true);
 #endif
   if (yap_init->SavedState == NULL) {

C/exec.c

@@ -1467,7 +1467,7 @@ static bool exec_absmi(bool top, yap_reset_t reset_mode USES_REGS) {
       while (B) {
       Yap_JumpToEnv(TermDAbort);
   }
-  LOCAL_PrologMode &~ AbortMode;
+  LOCAL_PrologMode &= ~AbortMode;
       P = (yamop *)FAILCODE;
       if (LOCAL_CBorder)
       LOCAL_CBorder = OldBorder;

C/load_dl.c

@@ -215,12 +215,17 @@ static Int LoadForeign(StringList ofiles, StringList libs, char *proc_name,
 
     if (proc_name && !*init_proc)
       *init_proc = (YapInitProc)dlsym(handle, proc_name);
-
     ofiles = ofiles->next;
   }
 
   if (!*init_proc) {
-    LOCAL_ErrorMessage = "Could not locate initialization routine";
+    LOCAL_ErrorMessage = malloc(MAX_ERROR_MSG_SIZE);
+    snprintf(LOCAL_ErrorMessage,
+           "Could not locate routine %s in %s: %s\n",
+           proc_name, LOCAL_FileNameBuf, dlerror());
+           fprintf(stderr,
+                  "Could not locate routine %s in %s: %s\n",
+                  proc_name, LOCAL_FileNameBuf, dlerror());
     return LOAD_FAILLED;
   }
 

C/modules.c

@@ -213,6 +213,8 @@ struct pred_entry *Yap_ModulePred(Term mod) {
 void Yap_NewModulePred(Term mod, struct pred_entry *ap) {
   ModEntry *me;
 
+  if (mod == 0)
+    mod = TermProlog;
   if (!(me = LookupModule(mod)))
     return;
   WRITE_LOCK(me->ModRWLock);

C/signals.c

@@ -67,7 +67,7 @@ static yap_signals InteractSIGINT(int ch) {
 #if PUSH_REGS
 // restore_absmi_regs(&Yap_standard_regs);
 #endif
-    siglongjmp(&LOCAL_RestartEnv, 4);
+    siglongjmp(LOCAL_RestartEnv, 4);
     return YAP_ABORT_SIGNAL;
   case 'b':
     /* continue */

packages/python/yapi.py

@@ -0,0 +1,101 @@
+
+import yap
+import sys
+# debugging support.
+import pdb
+
+def query_prolog(engine, s):
+
+    def answer(q):
+        try:
+            return q.next()
+        except Exception as e:
+            print(e.args[1])
+            return False
+
+    #
+    #construct a query from a one-line string
+    # q is opaque to Python
+    q = engine.query(s)
+    # vs is the list of variables
+    # you can print it out, the left-side is the variable name,
+    # the right side wraps a handle to a variable
+    vs = q.namedVars()
+    # atom match either symbols, or if no symbol exists, sttrings, In this case
+    # variable names should match strings
+    for eq in vs:
+        if not isinstance(eq[0],str):
+            print( "Error: Variable Name matches a Python Symbol")
+            return
+    ask = True
+    # launch the query
+    while answer(q):
+        # this new vs should contain bindings to vars
+        vs=  q.namedVars()
+        #numbervars
+        i=0
+        # iteratw
+        for eq in vs:
+            name = eq[0]
+            # this is tricky, we're going to bind the variables in the term so thay we can
+            # output X=Y. The Python way is to use dictionares.
+            #Instead, we use the T function to tranform the Python term back to Prolog
+            binding = yap.T(eq[1])
+            if binding.isVar():
+                binding.unify(name)
+            else:
+                i = binding.numberVars(i, True)
+                print(name + " = " + binding.text())
+            #ok, that was Prolog code
+        print("yes")
+        # deterministic = one solution
+        if q.deterministic():
+            # done
+            q.close()
+            return
+        if ask:
+            s = input("more(;),  all(*), no(\\n), python(#) ?").lstrip()
+            if s.startswith(';') or s.startswith('y'):
+                continue
+            elif s.startswith('#'):
+                try:
+                    exec(s.lstrip('#'))
+                except:
+                    raise
+            elif s.startswith('*') or s.startswith('a'):
+                ask = False
+                continue
+            else:
+                break
+    print("No (more) answers")
+    q.close()
+    return
+
+
+def live():
+    engine = yap.YAPEngine()
+    loop = True
+    pdb.set_trace()
+    while loop:
+        try:
+            s = input("?- ")
+            if not s:
+                loop = False
+            query_prolog(engine, s)
+        except SyntaxError as err:
+            print("Syntax Error error: {0}".format(err))
+        except EOFError:
+            return
+        except RuntimeError as err:
+            print("YAP Execution Error: {0}".format(err))
+        except ValueError:
+            print("Could not convert data to an integer.")
+        except:
+            print("Unexpected error:", sys.exc_info()[0])
+            raise
+    engine.close()
+#
+# initialize engine
+# engine = yap.YAPEngine();
+# engine = yap.YAPEngine(yap.YAPParams());
+#live()