From 2b514827ef06fd69e1739e7f367712619dee7784 Mon Sep 17 00:00:00 2001 From: Jan Kiszka Date: Tue, 17 Feb 2015 13:46:38 -0800 Subject: [PATCH] scripts/gdb: add cache for type objects Type lookups are very slow in gdb-python which is often noticeable when iterating over a number of objects. Introduce the helper class CachedType that keeps a reference to a gdb.Type object but also refreshes it after an object file has been loaded. Signed-off-by: Jan Kiszka Cc: Thomas Gleixner Cc: Jason Wessel Cc: Andi Kleen Cc: Ben Widawsky Cc: Borislav Petkov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- scripts/gdb/linux/utils.py | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 scripts/gdb/linux/utils.py diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py new file mode 100644 index 000000000000..f88361130e4c --- /dev/null +++ b/scripts/gdb/linux/utils.py @@ -0,0 +1,34 @@ +# +# gdb helper commands and functions for Linux kernel debugging +# +# common utilities +# +# Copyright (c) Siemens AG, 2011-2013 +# +# Authors: +# Jan Kiszka +# +# This work is licensed under the terms of the GNU GPL version 2. +# + +import gdb + + +class CachedType: + def __init__(self, name): + self._type = None + self._name = name + + def _new_objfile_handler(self, event): + self._type = None + gdb.events.new_objfile.disconnect(self._new_objfile_handler) + + def get_type(self): + if self._type is None: + self._type = gdb.lookup_type(self._name) + if self._type is None: + raise gdb.GdbError( + "cannot resolve type '{0}'".format(self._name)) + if hasattr(gdb, 'events') and hasattr(gdb.events, 'new_objfile'): + gdb.events.new_objfile.connect(self._new_objfile_handler) + return self._type