[bitbake-devel] [PATCH 08/16] data_smart: Add explict None checks

[Richard Purdie]

From: Alexandru DAMIAN <alexandru.damian at intel.com>

Simple if xxx checks end up calling len(xxx). We're interested in the specific case
of None which means we can break out the iterator much earlier after the first
item. This adds in the specific tests for None in what is a hot path in the
data store code which gives small performance gains.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 lib/bb/data_smart.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/bb/data_smart.py b/lib/bb/data_smart.py
index 1bb186e..970e404 100644
--- a/lib/bb/data_smart.py
+++ b/lib/bb/data_smart.py
@@ -588,7 +588,7 @@ class DataSmart(MutableMapping):
     def getVarFlag(self, var, flag, expand=False, noweakdefault=False):
         local_var = self._findVar(var)
         value = None
-        if local_var:
+        if local_var is not None:
             if flag in local_var:
                 value = copy.copy(local_var[flag])
             elif flag == "_content" and "defaultval" in local_var and not noweakdefault:
@@ -599,7 +599,7 @@ class DataSmart(MutableMapping):
             if flag == "_content":
                 cachename = var
             value = self.expand(value, cachename)
-        if value and flag == "_content" and local_var and "_removeactive" in local_var:
+        if value is not None and flag == "_content" and local_var is not None and "_removeactive" in local_var:
             filtered = filter(lambda v: v not in local_var["_removeactive"],
                               value.split(" "))
             value = " ".join(filtered)
-- 
1.8.1.2