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Re: [PATCH] Fix usage of to_string() for pretty-printers with children
- From: Peter Linss <peter@elemental.software>
- To: Eli Zaretskii <eliz at gnu dot org>
- Cc: gdb-patches at sourceware dot org
- Date: Thu, 25 May 2017 10:51:26 -0700
- Subject: Re: [PATCH] Fix usage of to_string() for pretty-printers with children
- Authentication-results: sourceware.org; auth=none
- References: <DA4CEF9D-0714-4EA8-A08A-A3F02B923269@elemental.software> <83shjtkmo8.fsf@gnu.org>
> On May 25, 2017, at 7:59 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>
>> From: Peter Linss <peter@elemental.software>
>> Date: Wed, 24 May 2017 19:33:41 -0700
>>
>> diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
>> index 9fb70f6d2a..05e5b868ed 100644
>> --- a/gdb/doc/gdb.texinfo
>> +++ b/gdb/doc/gdb.texinfo
>> @@ -29444,8 +29444,9 @@ reliable for a dynamic varobj. Instead, you must examine the
>>
>> @item value
>> The varobj's scalar value. For a varobj whose type is some sort of
>> -aggregate (e.g., a @code{struct}), or for a dynamic varobj, this value
>> -will not be interesting.
>> +aggregate (e.g., a @code{struct}) this value will not be interesting.
> ^
> Please add back the comma removed here.
>
> The documentation part is approved with this gotcha fixed.
>
> Thanks.
Revised patch with comma restored (not sure if you want a new email thread for small patch revisions like this):
—
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 9fb70f6d2a..ff2992e433 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -29444,8 +29444,9 @@ reliable for a dynamic varobj. Instead, you must examine the
@item value
The varobj's scalar value. For a varobj whose type is some sort of
-aggregate (e.g., a @code{struct}), or for a dynamic varobj, this value
-will not be interesting.
+aggregate (e.g., a @code{struct}), this value will not be interesting.
+For a dynamic varobj, this value comes from the Python pretty-printer
+object's @code{to_string} method, if present. @xref{Pretty Printing API}.
@item type
The varobj's type. This is a string representation of the type, as
diff --git a/gdb/varobj.c b/gdb/varobj.c
index 7bd549d45c..925c6318a8 100644
--- a/gdb/varobj.c
+++ b/gdb/varobj.c
@@ -686,21 +686,6 @@ install_dynamic_child (struct varobj *var,
}
}
-#if HAVE_PYTHON
-
-static int
-dynamic_varobj_has_child_method (const struct varobj *var)
-{
- PyObject *printer = var->dynamic->pretty_printer;
-
- if (!gdb_python_initialized)
- return 0;
-
- gdbpy_enter_varobj enter_py (var);
- return PyObject_HasAttr (printer, gdbpy_children_cst);
-}
-#endif
-
/* A factory for creating dynamic varobj's iterators. Returns an
iterator object suitable for iterating over VAR's children. */
@@ -2420,11 +2405,6 @@ varobj_value_get_print_value (struct value *value,
if (value_formatter)
{
- /* First check to see if we have any children at all. If so,
- we simply return {...}. */
- if (dynamic_varobj_has_child_method (var))
- return "{...}";
-
if (PyObject_HasAttr (value_formatter, gdbpy_to_string_cst))
{
struct value *replacement;
@@ -2486,6 +2466,13 @@ varobj_value_get_print_value (struct value *value,
if (replacement)
value = replacement;
}
+ else
+ {
+ /* If we don't have to_string but we have children,
+ we simply return {...}. */
+ if (PyObject_HasAttr (value_formatter, gdbpy_children_cst))
+ return "{...}";
+ }
}
}
#endif