linux-kernel - [PATCH v5 02/20] scripts/gdb: Add cache for type objects

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Message-Id: <464529fe760334f693f88e25084b54a92f2be9fc.1359463075.git.jan.kiszka@siemens.com>
Date:	Tue, 29 Jan 2013 13:37:45 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net,
	Andi Kleen <andi@...stfloor.org>,
	Tom Tromey <tromey@...hat.com>,
	Ben Widawsky <ben@...dawsk.net>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 02/20] 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 <jan.kiszka@...mens.com>
---
 scripts/gdb/utils.py |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/utils.py b/scripts/gdb/utils.py
index f75eae6..fdff85e 100644
--- a/scripts/gdb/utils.py
+++ b/scripts/gdb/utils.py
@@ -15,3 +15,24 @@ import gdb
 import re
 
 gdb_version = re.sub("^[^0-9]*", "", gdb.VERSION)
+
+
+class CachedType:
+	_type = None
+
+	def _new_objfile_handler(self, event):
+		self._type = None
+		gdb.events.new_objfile.disconnect(self._new_objfile_handler)
+
+	def __init__(self, name):
+		self._name = name
+
+	def get_type(self):
+		if self._type == None:
+			self._type = gdb.lookup_type(self._name)
+			if self._type == None:
+				raise gdb.GdbError("cannot resolve " \
+						   "type '%s'" % self._name)
+			gdb.events.new_objfile.connect(
+				self._new_objfile_handler)
+		return self._type
-- 
1.7.3.4

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