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99 lines
3.6 KiB
99 lines
3.6 KiB
#!/usr/bin/env python
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"""Validate compact unwind info by cross checking the llvm-objdump
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reports of the input object file vs final linked output.
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"""
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from __future__ import print_function
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import sys
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import argparse
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import re
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from pprint import pprint
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def main():
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hex = "[a-f\d]"
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hex8 = hex + "{8}"
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('files', metavar='FILES', nargs='*',
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help='output of (llvm-objdump --unwind-info --syms) for object file(s) plus final linker output')
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parser.add_argument('--debug', action='store_true')
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args = parser.parse_args()
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if args.files:
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objdump_string = ''.join([open(f).read() for f in args.files])
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else:
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objdump_string = sys.stdin.read()
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object_encodings_list = [(symbol, encoding, personality, lsda)
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for symbol, encoding, personality, lsda in
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re.findall(r"start:\s+0x%s+\s+(\w+)\s+" % hex +
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r"length:\s+0x%s+\s+" % hex +
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r"compact encoding:\s+0x(%s+)(?:\s+" % hex +
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r"personality function:\s+0x(%s+)\s+\w+\s+" % hex +
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r"LSDA:\s+0x(%s+)\s+\w+(?: \+ 0x%s+)?)?" % (hex, hex),
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objdump_string, re.DOTALL)]
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object_encodings_map = {symbol:encoding
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for symbol, encoding, _, _ in object_encodings_list}
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if not object_encodings_map:
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sys.exit("no object encodings found in input")
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program_symbols_map = {address:symbol
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for address, symbol in
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re.findall(r"^%s(%s) g\s+F __TEXT,__text (x\1)$" % (hex8, hex8),
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objdump_string, re.MULTILINE)}
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if not program_symbols_map:
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sys.exit("no program symbols found in input")
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program_common_encodings = (
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re.findall(r"^\s+encoding\[\d+\]: 0x(%s+)$" % hex,
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objdump_string, re.MULTILINE))
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if not program_common_encodings:
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sys.exit("no common encodings found in input")
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program_encodings_map = {program_symbols_map[address]:encoding
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for address, encoding in
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re.findall(r"^\s+\[\d+\]: function offset=0x(%s+), " % hex +
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r"encoding\[\d+\]=0x(%s+)$" % hex,
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objdump_string, re.MULTILINE)}
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if not object_encodings_map:
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sys.exit("no program encodings found in input")
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# Fold adjacent entries from the object file that have matching encodings
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# TODO(gkm) add check for personality+lsda
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encoding0 = 0
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for symbol in sorted(object_encodings_map):
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encoding = object_encodings_map[symbol]
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fold = (encoding == encoding0)
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if fold:
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del object_encodings_map[symbol]
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if args.debug:
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print("%s %s with %s" % (
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'delete' if fold else 'retain', symbol, encoding))
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encoding0 = encoding
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if program_encodings_map != object_encodings_map:
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if args.debug:
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pprint("program encodings map:\n" + program_encodings_map)
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pprint("object encodings map:\n" + object_encodings_map)
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sys.exit("encoding maps differ")
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# Count frequency of object-file folded encodings
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# and compare with the program-file common encodings table
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encoding_frequency_map = {}
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for _, encoding in object_encodings_map.items():
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encoding_frequency_map[encoding] = 1 + encoding_frequency_map.get(encoding, 0)
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encoding_frequencies = [x for x in
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sorted(encoding_frequency_map,
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key=lambda x: (encoding_frequency_map.get(x), x),
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reverse=True)]
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if program_common_encodings != encoding_frequencies:
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if args.debug:
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pprint("program common encodings:\n" + program_common_encodings)
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pprint("object encoding frequencies:\n" + encoding_frequencies)
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sys.exit("encoding frequencies differ")
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if __name__ == '__main__':
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main()
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