linux-kernel - [PATCH 05/18] scripts/gdb: Provide exception catching parser

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Message-Id: <c72b25c06fc66e1d68371154097e2cbb112555d8.1462865983.git.jan.kiszka@siemens.com>
Date:	Tue, 10 May 2016 09:39:30 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Kieran Bingham <kieran.bingham@...aro.org>
Subject: [PATCH 05/18] scripts/gdb: Provide exception catching parser

From: Kieran Bingham <kieran.bingham@...aro.org>

If we attempt to read a value that is not available to GDB, an exception
is raised. Most of the time, this is a good thing; however on occasion
we will want to be able to determine if a symbol is available.

By catching the exception to simply return None, we can determine if we
tried to read an invalid value, without the exception taking our execution
context away from us

Signed-off-by: Kieran Bingham <kieran.bingham@...aro.org>
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 scripts/gdb/linux/utils.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/gdb/linux/utils.py b/scripts/gdb/linux/utils.py
index 0893b32..dbe2ad7 100644
--- a/scripts/gdb/linux/utils.py
+++ b/scripts/gdb/linux/utils.py
@@ -154,3 +154,10 @@ def get_gdbserver_type():
         if gdbserver_type is not None and hasattr(gdb, 'events'):
             gdb.events.exited.connect(exit_handler)
     return gdbserver_type
+
+
+def gdb_eval_or_none(expresssion):
+    try:
+        return gdb.parse_and_eval(expresssion)
+    except:
+        return None
-- 
2.1.4