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69 lines
2.2 KiB
69 lines
2.2 KiB
5 years ago
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#-------------------------------------------------------------------------------
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# elftools: dwarf/ranges.py
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#
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# DWARF ranges section decoding (.debug_ranges)
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#
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# Eli Bendersky (eliben@gmail.com)
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# This code is in the public domain
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#-------------------------------------------------------------------------------
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import os
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from collections import namedtuple
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from ..common.utils import struct_parse
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RangeEntry = namedtuple('RangeEntry', 'begin_offset end_offset')
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BaseAddressEntry = namedtuple('BaseAddressEntry', 'base_address')
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class RangeLists(object):
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""" A single range list is a Python list consisting of RangeEntry or
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BaseAddressEntry objects.
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"""
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def __init__(self, stream, structs):
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self.stream = stream
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self.structs = structs
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self._max_addr = 2 ** (self.structs.address_size * 8) - 1
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def get_range_list_at_offset(self, offset):
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""" Get a range list at the given offset in the section.
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"""
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self.stream.seek(offset, os.SEEK_SET)
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return self._parse_range_list_from_stream()
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def iter_range_lists(self):
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""" Yield all range lists found in the section.
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"""
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# Just call _parse_range_list_from_stream until the stream ends
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self.stream.seek(0, os.SEEK_END)
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endpos = self.stream.tell()
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self.stream.seek(0, os.SEEK_SET)
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while self.stream.tell() < endpos:
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yield self._parse_range_list_from_stream()
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#------ PRIVATE ------#
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def _parse_range_list_from_stream(self):
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lst = []
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while True:
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begin_offset = struct_parse(
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self.structs.Dwarf_target_addr(''), self.stream)
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end_offset = struct_parse(
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self.structs.Dwarf_target_addr(''), self.stream)
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if begin_offset == 0 and end_offset == 0:
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# End of list - we're done.
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break
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elif begin_offset == self._max_addr:
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# Base address selection entry
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lst.append(BaseAddressEntry(base_address=end_offset))
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else:
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# Range entry
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lst.append(RangeEntry(
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begin_offset=begin_offset,
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end_offset=end_offset))
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return lst
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