addresses.py

# Disassembler 8051/8052
#
# Symbols and associated addresses
#
# Copyright (c) 2022 Aleksander Mazur
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys, re
import utils

class Addresses:
	pat = re.compile(';?(?P<label>[a-zA-Z0-9_]+)\s+(?P<scope>[A-Z]+)\s+(?P<addr>[0-9A-F]+)(?P<hex>h|H)?')

	def __init__(self):
		self.addr = {}
		self.addr['CODE'] = {}	# offsets in code segment used for emitting ORG statements
		self.addr['DATA'] = {}	# symbols in data segment (direct addressing)
		self.addr['BIT'] = {}	# symbols in bit segment
		self.addr['LABEL'] = {}	# symbols in code segment used for emitting labels

	def __str__(self):
		s = ''
		for k, v in self.addr.items():
			s += ('\n%s: ' % k) + str(v)
		return s[1:]

	def include(self, f):
		starts = {}
		for line in f.readlines():
			line = line[:-1]
			m = Addresses.pat.match(line)
			if m:
				label = m.group('label')
				scope = m.group('scope').upper()
				base = m.group('hex')
				if base:
					base = 16
				else:
					base = 10
				addr = int(m.group('addr'), base)
				if scope in self.addr:
					if addr in self.addr[scope]:
						print('warning: overriding %s %s from %s to %s' % (scope, utils.int2hex(addr), self.addr[scope][addr], label), file=sys.stderr)
					self.addr[scope][addr] = label
				if scope == 'CODE':
					starts[label] = addr
			elif len(line) > 0 and line[0] != ';':
				print('warning: unrecognized definition: %s' % line, file=sys.stderr)
		return starts

	def __getitem__(self, scope):
		return self.addr[scope]

	def __iter__(self):
		return iter(self.addr)