BaseTools: GenPatchPcdTable - refactor RegEx to minimize multiple compiling

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>

BaseTools/Source/Python/GenPatchPcdTable/GenPatchPcdTable.py

@@ -63,6 +63,7 @@ def parsePcdInfoFromMapFile(mapfilepath, efifilepath):
     return _parseGeneral(lines, efifilepath)
 
 def _parseForXcode(lines, efifilepath):
+    valuePattern = re.compile('^([\da-fA-FxX]+)([\s\S]*)([_]*_gPcd_BinaryPatch_([\w]+))')
     status = 0
     pcds = []
     for line in lines:
@@ -72,13 +73,16 @@ def _parseForXcode(lines, efifilepath):
             continue
         if status == 1 and len(line) != 0:
             if '_gPcd_BinaryPatch_' in line:
-                m = re.match('^([\da-fA-FxX]+)([\s\S]*)([_]*_gPcd_BinaryPatch_([\w]+))', line)
+                m = valuePattern.match(line)
                 if m is not None:
                     pcds.append((m.groups(0)[3], int(m.groups(0)[0], 16)))
     return pcds
 
 def _parseForGCC(lines, efifilepath):
     """ Parse map file generated by GCC linker """
+    valuePattern = re.compile('^([\w_\.]+) +([\da-fA-Fx]+) +([\da-fA-Fx]+)$')
+    dataPattern = re.compile('^.data._gPcd_BinaryPatch_([\w_\d]+)$')
+    pcdPattern = re.compile('^([\da-fA-Fx]+) +([\da-fA-Fx]+)')
     status = 0
     imageBase = -1
     sections = []
@@ -98,15 +102,15 @@ def _parseForGCC(lines, efifilepath):
 
         # status handler
         if status == 3:
-            m = re.match('^([\w_\.]+) +([\da-fA-Fx]+) +([\da-fA-Fx]+)$', line)
+            m = valuePattern.match(line)
             if m is not None:
                 sections.append(m.groups(0))
         if status == 3:
-            m = re.match('^.data._gPcd_BinaryPatch_([\w_\d]+)$', line)
+            m = dataPattern.match(line)
             if m is not None:
                 if lines[index + 1]:
                     PcdName = m.groups(0)[0]
-                    m = re.match('^([\da-fA-Fx]+) +([\da-fA-Fx]+)', lines[index + 1].strip())
+                    m = pcdPattern.match(lines[index + 1].strip())
                     if m is not None:
                         bpcds.append((PcdName, int(m.groups(0)[0], 16) , int(sections[-1][1], 16), sections[-1][0]))
                 
@@ -137,17 +141,19 @@ def _parseGeneral(lines, efifilepath):
     status = 0    #0 - beginning of file; 1 - PE section definition; 2 - symbol table
     secs = []    # key = section name
     bPcds = []
-
+    startPattern = re.compile("^Start[' ']+Length[' ']+Name[' ']+Class")
+    addressPattern = re.compile("^Address[' ']+Publics by Value[' ']+Rva\+Base")
+    symPattern = re.compile('^[_]+gPcd_BinaryPatch_([\w]+)')
 
     for line in lines:
         line = line.strip()
-        if re.match("^Start[' ']+Length[' ']+Name[' ']+Class", line):
+        if startPattern.match(line):
             status = 1
             continue
-        if re.match("^Address[' ']+Publics by Value[' ']+Rva\+Base", line):
+        if addressPattern.match(line):
             status = 2
             continue
-        if re.match("^entry point at", line):
+        if line.startswith("entry point at"):
             status = 3
             continue
         if status == 1 and len(line) != 0:
@@ -162,7 +168,7 @@ def _parseGeneral(lines, efifilepath):
             sec_no = int(sec_no, 16)
             sym_offset = int(sym_offset, 16)
             vir_addr = int(vir_addr, 16)
-            m2 = re.match('^[_]+gPcd_BinaryPatch_([\w]+)', sym_name)
+            m2 = symPattern.match(sym_name)
             if m2 is not None:
                 # fond a binary pcd entry in map file
                 for sec in secs: