gdb

* varobj.c (update_dynamic_varobj_children): Properly handle
	errors from iterator.
gdb/testsuite
	* gdb.python/py-prettyprint.py (exception_flag): New global.
	(NoStringContainerPrinter._iterator.next): Check it.
	* gdb.python/py-prettyprint.c (main): New variable nstype2.
	* gdb.python/py-mi.exp: Set exception_flag and do more tests.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2011-03-31  Tom Tromey  <tromey@redhat.com>
+
+	* varobj.c (update_dynamic_varobj_children): Properly handle
+	errors from iterator.
+
 2011-03-31  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	* dwarf2read.c (dwarf2_name): Initialize DEMANGLED.  Avoid demangling

gdb/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2011-03-31  Tom Tromey  <tromey@redhat.com>
+
+	* gdb.python/py-prettyprint.py (exception_flag): New global.
+	(NoStringContainerPrinter._iterator.next): Check it.
+	* gdb.python/py-prettyprint.c (main): New variable nstype2.
+	* gdb.python/py-mi.exp: Set exception_flag and do more tests.
+
 2011-03-29  Tom Tromey  <tromey@redhat.com>
 
 	* gdb.cp/anon-struct.cc: New file.

gdb/testsuite/gdb.python/py-mi.exp

@@ -274,4 +274,13 @@ mi_gdb_test "-var-set-visualizer nscont gdb.default_visualizer" \
   "\\^done" \
   "choose default visualizer"
 
+mi_gdb_test "python exception_flag = True" ""
+
+mi_create_dynamic_varobj nstype2 nstype2 \
+  "create nstype2 varobj"
+
+mi_list_varobj_children nstype2 {
+    { {nstype2.<error at 0>} {<error at 0>} 6 {char \[6\]} }
+} "list children after setting exception flag"
+
 remote_file host delete ${remote_python_file}

gdb/testsuite/gdb.python/py-prettyprint.c

@@ -212,7 +212,7 @@ main ()
   const struct string_repr cstring = { { "const string" } };
   /* Clearing by being `static' could invoke an other GDB C++ bug.  */
   struct nullstr nullstr;
-  nostring_type nstype;
+  nostring_type nstype, nstype2;
   struct ns ns, ns2;
   struct lazystring estring, estring2;
 
@@ -283,5 +283,7 @@ main ()
   nstype.elements[1] = 42;
   nstype.len = 2;
   
+  nstype2 = nstype;
+
   return 0;      /* break to inspect struct and union */
 }

gdb/testsuite/gdb.python/py-prettyprint.py

@@ -53,6 +53,9 @@ class ContainerPrinter:
     def children(self):
         return self._iterator(self.val['elements'], self.val['len'])
 
+# Flag to make NoStringContainerPrinter throw an exception.
+exception_flag = False
+
 # Test a printer where to_string is None
 class NoStringContainerPrinter:
     class _iterator:
@@ -67,6 +70,8 @@ class NoStringContainerPrinter:
         def next(self):
             if self.pointer == self.end:
                 raise StopIteration
+            if exception_flag:
+                raise gdb.MemoryError, 'hi bob'
             result = self.pointer
             self.pointer = self.pointer + 1
             return ('[%d]' % int (result - self.start), result.dereference())

gdb/varobj.c

@@ -1026,6 +1026,7 @@ update_dynamic_varobj_children (struct varobj *var,
   for (; to < 0 || i < to + 1; ++i)
     {
       PyObject *item;
+      int force_done = 0;
 
       /* See if there was a leftover from last time.  */
       if (var->saved_item)
@@ -1037,7 +1038,48 @@ update_dynamic_varobj_children (struct varobj *var,
 	item = PyIter_Next (var->child_iter);
 
       if (!item)
-	break;
+	{
+	  /* Normal end of iteration.  */
+	  if (!PyErr_Occurred ())
+	    break;
+
+	  /* If we got a memory error, just use the text as the
+	     item.  */
+	  if (PyErr_ExceptionMatches (gdbpy_gdb_memory_error))
+	    {
+	      PyObject *type, *value, *trace;
+	      char *name_str, *value_str;
+
+	      PyErr_Fetch (&type, &value, &trace);
+	      value_str = gdbpy_exception_to_string (type, value);
+	      Py_XDECREF (type);
+	      Py_XDECREF (value);
+	      Py_XDECREF (trace);
+	      if (!value_str)
+		{
+		  gdbpy_print_stack ();
+		  break;
+		}
+
+	      name_str = xstrprintf ("<error at %d>", i);
+	      item = Py_BuildValue ("(ss)", name_str, value_str);
+	      xfree (name_str);
+	      xfree (value_str);
+	      if (!item)
+		{
+		  gdbpy_print_stack ();
+		  break;
+		}
+
+	      force_done = 1;
+	    }
+	  else
+	    {
+	      /* Any other kind of error.  */
+	      gdbpy_print_stack ();
+	      break;
+	    }
+	}
 
       /* We don't want to push the extra child on any report list.  */
       if (to < 0 || i < to)
@@ -1051,7 +1093,10 @@ update_dynamic_varobj_children (struct varobj *var,
 	  inner = make_cleanup_py_decref (item);
 
 	  if (!PyArg_ParseTuple (item, "sO", &name, &py_v))
-	    error (_("Invalid item from the child list"));
+	    {
+	      gdbpy_print_stack ();
+	      error (_("Invalid item from the child list"));
+	    }
 
 	  v = convert_value_from_python (py_v);
 	  if (v == NULL)
@@ -1071,6 +1116,9 @@ update_dynamic_varobj_children (struct varobj *var,
 	     element.  */
 	  break;
 	}
+
+      if (force_done)
+	break;
     }
 
   if (i < VEC_length (varobj_p, var->children))