gdb: add qt and kde pretty printers

[dotfiles.git] / gdb / helper.py

diff --git a/gdb/helper.py b/gdb/helper.py
new file mode 100644 (file)
index 0000000..3f40f8b
--- /dev/null
+++ b/gdb/helper.py
@@ -0,0 +1,91 @@
+# -*- coding: utf-8 -*-
+# Helper module for pretty-printers
+
+# Copyright (C) 2013 Kevin Funk <kfunk@kde.org>
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+
+# BEGIN: Utilities for wrapping differences of Python 2.x and Python 3
+# Inspired by http://pythonhosted.org/six/
+
+# Useful for very coarse version differentiation.
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+
+# create Python 2.x & 3.x compatible iterator base
+if PY3:
+    Iterator = object
+else:
+    class Iterator(object):
+
+        def next(self):
+            return type(self).__next__(self)
+if PY3:
+    unichr = chr
+else:
+    unichr = unichr
+
+# END
+
+# BEGIN: Helper functions for pretty-printers
+
+def has_field(val, name):
+    """Check whether @p val (gdb.Value) has a field named @p name"""
+    try:
+        val[name]
+        return True
+    except Exception:
+        return False
+
+def default_iterator(val):
+    for field in val.type.fields():
+        yield field.name, val[field.name]
+
+class FunctionLookup:
+
+    def __init__(self, gdb, pretty_printers_dict):
+        self.gdb = gdb
+        self.pretty_printers_dict = pretty_printers_dict
+
+    def __call__(self, val):
+        "Look-up and return a pretty-printer that can print val."
+
+        # Get the type.
+        type = val.type;
+
+        # If it points to a reference, get the reference.
+        if type.code == self.gdb.TYPE_CODE_REF:
+            type = type.target ()
+
+        # Get the unqualified type, stripped of typedefs.
+        type = type.unqualified ().strip_typedefs ()
+
+        # Get the type name.
+        typename = type.tag
+        if typename == None:
+            return None
+
+        # Iterate over local dictionary of types to determine
+        # if a printer is registered for that type.  Return an
+        # instantiation of the printer if found.
+        for function in self.pretty_printers_dict:
+            if function.search (typename):
+                return self.pretty_printers_dict[function](val)
+
+        # Cannot find a pretty printer.  Return None.
+        return None
+
+# END