singelton for isa parsers

osaca/parser/base_parser.py

@@ -15,9 +15,12 @@ class BaseParser(object):
     SEGMENT_EXT_ID = 'segment_extension'
     INSTRUCTION_ID = 'instruction'
     OPERANDS_ID = 'operands'
+    _parser_constructed = False
 
     def __init__(self):
-        self.construct_parser()
+        if not self._parser_constructed:
+            self.construct_parser()
+            self._parser_constructed = True
 
     @staticmethod
     def detect_ISA(file_content):

osaca/parser/parser_AArch64.py

@@ -7,6 +7,14 @@ from osaca.parser import AttrDict, BaseParser
 
 
 class ParserAArch64(BaseParser):
+    _instance = None
+
+    # Singelton pattern, as this is created very many times
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super(ParserAArch64, cls).__new__(cls)
+        return cls._instance
+
     def __init__(self):
         super().__init__()
         self.isa = 'aarch64'

osaca/parser/parser_x86att.py

@@ -8,6 +8,14 @@ from osaca.parser import AttrDict, BaseParser
 
 
 class ParserX86ATT(BaseParser):
+    _instance = None
+
+    # Singelton pattern, as this is created very many times
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super(ParserX86ATT, cls).__new__(cls)
+        return cls._instance
+
     def __init__(self):
         super().__init__()
         self.isa = 'x86'