BaseTools: fix imports

1 - Some of these imports are cascaded from another file. Import them locally.
2 - Some of these imports are not used. Remove them.
3 - Some of these were missing the namespace used to import them.

These changes facilitate optimization of BaseTools:
https://bugzilla.tianocore.org/show_bug.cgi?id=42

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Bob Feng <bob.c.feng@intel.com>

BaseTools/Source/Python/Workspace/DecBuildData.py

@@ -16,8 +16,10 @@ from Common.DataType import *
 from Common.Misc import *
 from types import *
 from collections import OrderedDict
-
+from CommonDataClass.DataClass import *
 from Workspace.BuildClassObject import PackageBuildClassObject, StructurePcd, PcdClassObject
+from Common.GlobalData import gGlobalDefines, gEcpSource
+from re import compile
 
 ## Platform build information from DEC file
 #
@@ -109,7 +111,7 @@ class DecBuildData(PackageBuildClassObject):
     @property
     def _Macros(self):
         if self._MacroDict is None:
-            self._MacroDict = dict(GlobalData.gGlobalDefines)
+            self._MacroDict = dict(gGlobalDefines)
         return self._MacroDict
 
     ## Get architecture
@@ -298,7 +300,7 @@ class DecBuildData(PackageBuildClassObject):
             PublicInclues = []
             RecordList = self._RawData[MODEL_EFI_INCLUDE, self._Arch]
             Macros = self._Macros
-            Macros["EDK_SOURCE"] = GlobalData.gEcpSource
+            Macros["EDK_SOURCE"] = gEcpSource
             for Record in RecordList:
                 File = PathClass(NormPath(Record[0], Macros), self._PackageDir, Arch=self._Arch)
                 LineNo = Record[-1]
@@ -464,6 +466,7 @@ class DecBuildData(PackageBuildClassObject):
         StructurePcds = self.ProcessStructurePcd(StrPcdSet)
         for pcd in StructurePcds:
             Pcds[pcd.TokenCName, pcd.TokenSpaceGuidCName, self._PCD_TYPE_STRING_[Type]] = pcd
+        StructPattern = compile(r'[_a-zA-Z][0-9A-Za-z_]*$')
         for pcd in Pcds.values():
             if pcd.DatumType not in [TAB_UINT8, TAB_UINT16, TAB_UINT32, TAB_UINT64, TAB_VOID, "BOOLEAN"]:
                 if not pcd.IsAggregateDatumType():