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simplified MemAddr parsing

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Julian Hammer
2019-01-08 17:50:06 +01:00
parent b3b4b3c3ba
commit 496fdcfb44
1 changed files with 20 additions and 28 deletions
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48
osaca/param.py
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@@ -1,4 +1,7 @@
#!/usr/bin/env python3
import re
class Parameter(object):
type_list = ['REG', 'MEM', 'IMD', 'LBL', 'NONE']
@@ -21,38 +24,27 @@ class MemAddr(Parameter):
def __init__(self, name):
super().__init__("MEM")
self.sreg = False
self.offset = False
self.base = False
self.index = False
self.scale = False
if ':' in name:
if name[1:name.index(':')].upper() not in self.segment_regs:
raise NameError('Type not supported: '+name)
self.sreg = True
self.offset = True
if '(' not in name or ('(' in name and name.index('(') != 0):
self.offset = True
if '(' in name:
self.parentheses = name[name.index('(')+1:-1]
self.commacnt = self.parentheses.count(',')
if self.commacnt == 0:
self.base = True
elif self.commacnt == 1 or self.commacnt == 2 and int(self.parentheses[-1:]) == 1:
self.base = True
self.index = True
elif self.commacnt == 2 and int(self.parentheses[-1:]) in self.scales:
self.base = True
self.index = True
self.scale = True
else:
raise NameError('Type not supported: '+name)
name = name.strip(', \t')
self.offset = None
self.base = None
self.index = None
self.scale = None
m = re.match(r'(?P<offset>[x0-9a-fA-F]*)\((?P<base>[^,\)]+)(?:,\s*(?P<index>[^,\)]+)'
r'(?:,\s*(?P<scale>[^,\)]+))?)?\)', name)
if not m:
raise ValueError('Type not supported: {!r}'.format(name))
self.offset = m.group('offset') or None
self.base = m.group('base') or None
self.index = m.group('index') or None
self.scale = m.group('scale') or None
def __str__(self):
"""returns string representation"""
mem_format = 'MEM('
if self.sreg:
mem_format += 'sreg:'
if self.offset:
mem_format += 'offset'
if self.base and not self.index: