bitbake: data_smart: Add explict None checks

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.

(Bitbake rev: a4d81e44a7cd3dafb0bf12f7cac5ff511db18e60)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/bitbake/lib/bb/data_smart.py b/bitbake/lib/bb/data_smart.py
index 1bb186e10032965e3eff1df0faaf424ab51f1eaf..970e404b1709c8946ce40192d1ee9cad9ede7f7a 100644 (file)
--- a/bitbake/lib/bb/data_smart.py
+++ b/bitbake/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)