bitbake: codeparser/data_smart: Optimise parsing speed

The previous "contains" changes caused a ~3% parsing speed impact.
Looking at the cause of those changes was interesting:

* Use of defaultdict was slower than just checking for missing entries
  and setting them when needed.
* Even the "import collections" adversely affects parsing speed
* There was a missing intern function for the contains cache data
* Setting up a log object for each variable has noticeable overhead
  due to the changes in the code paths uses, we can avoid this.
* We can call getVarFlag on "_content" directly within VariableParse
  for a noticeable speed gain since its a seriously hot code path.

This patch therefore tweaks the code based on the above observations to
get some of the speed back.

(Bitbake rev: fca802187a2a30686a8a07d2b6b16a3e5716e293)

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

bitbake/lib/bb/codeparser.py

@@ -1,7 +1,6 @@
 import ast
 import codegen
 import logging
-import collections
 import os.path
 import bb.utils, bb.data
 from itertools import chain
@@ -65,6 +64,8 @@ class CodeParserCache(MultiProcessCache):
         for h in data[0]:
             data[0][h]["refs"] = self.internSet(data[0][h]["refs"])
             data[0][h]["execs"] = self.internSet(data[0][h]["execs"])
+            for k in data[0][h]["contains"]:
+                data[0][h]["contains"][k] = self.internSet(data[0][h]["contains"][k])
         for h in data[1]:
             data[1][h]["execs"] = self.internSet(data[1][h]["execs"])
         return
@@ -125,6 +126,8 @@ class PythonParser():
             if isinstance(node.args[0], ast.Str):
                 varname = node.args[0].s
                 if name in self.containsfuncs and isinstance(node.args[1], ast.Str):
+                    if varname not in self.contains:
+                        self.contains[varname] = set()
                     self.contains[varname].add(node.args[1].s)
                 else:                      
                     self.references.add(node.args[0].s)
@@ -153,10 +156,10 @@ class PythonParser():
 
     def __init__(self, name, log):
         self.var_execs = set()
-        self.contains = collections.defaultdict(set)
+        self.contains = {}
         self.execs = set()
         self.references = set()
-        self.log = BufferedLogger('BitBake.Data.%s' % name, logging.DEBUG, log)
+        self.log = BufferedLogger('BitBake.Data.PythonParser', logging.DEBUG, log)
 
         self.unhandled_message = "in call of %s, argument '%s' is not a string literal"
         self.unhandled_message = "while parsing %s, %s" % (name, self.unhandled_message)