[PATCH] bug 14741 - in -var-update, all children get the display hint and dynamic attribute value from the root variable

["Elmenthaler, Jens" <JENS dot ELMENTHALER at advantest dot com>]

Hope there is someone who could have a look at the following patch. The bug impacts Eclipse CDT which by default has pretty printing enabled:

diff --git a/gdb/mi/mi-cmd-var.c b/gdb/mi/mi-cmd-var.c
index dc47bc1..6416d7d 100644
--- a/gdb/mi/mi-cmd-var.c
+++ b/gdb/mi/mi-cmd-var.c
@@ -793,14 +793,14 @@
               ui_out_field_int (uiout, "new_num_children", 
                                                  varobj_get_num_children (r->varobj));

-      display_hint = varobj_get_display_hint (var);
+      display_hint = varobj_get_display_hint (r->varobj);
       if (display_hint)
               {
                 ui_out_field_string (uiout, "displayhint", display_hint);
                 xfree (display_hint);
               }

-      if (varobj_pretty_printed_p (var))
+      if (varobj_pretty_printed_p (r->varobj))
               ui_out_field_int (uiout, "dynamic", 1);

       varobj_get_child_range (r->varobj, &from, &to);
diff --git a/gdb/testsuite/gdb.python/py-mi.exp b/gdb/testsuite/gdb.python/py-mi.exp
index e7034a1..49b4def 100644
--- a/gdb/testsuite/gdb.python/py-mi.exp
+++ b/gdb/testsuite/gdb.python/py-mi.exp
@@ -182,7 +182,7 @@
   "update after next with restricted range" {
       type_changed false new_num_children 1 dynamic 1 has_more 1
   } {
-      { name {container.\[0\]} in_scope true type_changed false dynamic 1 has_more 0 }
+      { name {container.\[0\]} in_scope true type_changed false has_more 0 }
   } {
   }

@@ -239,7 +239,7 @@
mi_next "next over outer update"

 mi_gdb_test "-var-update outer" \
-  ".done,changelist=.{name=\"outer.s.a\",in_scope=\"true\",type_changed=\"false\",dynamic=\"1\",has_more=\"0\"}." \
+  ".done,changelist=.{name=\"outer.s.a\",in_scope=\"true\",type_changed=\"false\",has_more=\"0\"}." \
   "update after updating element of outer"

 mi_continue_to_line \
@@ -293,6 +293,28 @@
mi_create_dynamic_varobj children_as_list children_as_list \
     "printer whose children are returned as a list"

+# Regression test for bug 14741.
+mi_continue_to_line \
+    [gdb_get_line_number {breakpoint bug 14741} ${srcfile}] \
+    "step to breakpoint for bug 14741"
+
+mi_create_dynamic_varobj c c \
+  "create varobj for c"
+
+mi_gdb_test "-var-set-visualizer c ArrayPrinter" \
+  "\\^done" \
+  "choose array visualizer for c"
+
+mi_list_varobj_children c {
+    { {c.\[0\]} {\[0\]} 0 int }
+} "list children of c"
+
+mi_next "next over change of array element"
+
+mi_gdb_test "-var-update c" \
+    "\\^done,changelist=\\\[{name=\"c.\\\[0\\\]\",in_scope=\"true\",type_changed=\"false\",has_more=\"0\"}\\\]" \
+    "update varobj after element change"
+
# C++ MI tests
gdb_exit
if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}-cxx" \
diff --git a/gdb/testsuite/gdb.python/py-prettyprint.c b/gdb/testsuite/gdb.python/py-prettyprint.c
index b1a12b1..14fd528 100644
--- a/gdb/testsuite/gdb.python/py-prettyprint.c
+++ b/gdb/testsuite/gdb.python/py-prettyprint.c
@@ -196,6 +196,13 @@
   ++c->len;
}

+void
+set_item(zzz_type *c, int i, int val)
+{
+  if (i < c->len)
+    c->elements[i] = val;
+}
+
void init_s(struct s *s, int a)
{
   s->a = a;
@@ -237,6 +244,15 @@
                                                               eval7 = { 7 }, eval8 = { 8 }, eval9 = { 9 };

   eval1.x++; /* eval-break */
+}
+
+static void
+bug_14741()
+{
+  zzz_type c = make_container ("bug_14741");
+  add_item (&c, 71);
+  set_item(&c, 0, 42); /* breakpoint bug 14741 */
+  set_item(&c, 0, 5);
}

 int
@@ -332,5 +348,6 @@

   eval_sub ();

-  return 0;      /* break to inspect struct and union */
+  bug_14741();      /* break to inspect struct and union */
+  return 0;
}
diff --git a/gdb/testsuite/gdb.python/py-prettyprint.py b/gdb/testsuite/gdb.python/py-prettyprint.py
index 6e960e6..65a7cab 100644
--- a/gdb/testsuite/gdb.python/py-prettyprint.py
+++ b/gdb/testsuite/gdb.python/py-prettyprint.py
@@ -54,6 +54,36 @@
     def children(self):
         return self._iterator(self.val['elements'], self.val['len'])

+# Treats a container as array.
+class ArrayPrinter:
+    class _iterator:
+        def __init__ (self, pointer, len):
+            self.start = pointer
+            self.pointer = pointer
+            self.end = pointer + len
+
+        def __iter__(self):
+            return self
+
+        def next(self):
+            if self.pointer == self.end:
+                raise StopIteration
+            result = self.pointer
+            self.pointer = self.pointer + 1
+            return ('[%d]' % int (result - self.start), result.dereference())
+
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        return 'array %s with %d elements' % (self.val['name'], self.val['len'])
+
+    def children(self):
+        return self._iterator(self.val['elements'], self.val['len'])
+
+    def display_hint (self):
+        return 'array'
+
# Flag to make NoStringContainerPrinter throw an exception.
exception_flag = False