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Fix shallowest successor find when multiple nodes lead to the same location, fix if swap optimization and add BITAND and NOT_BITAND if support.

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Jennifer Taylor 2021-04-26 03:24:47 +00:00
parent 8cf219cb25
commit 820a86845d
1 changed files with 15 additions and 5 deletions
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20
bemani/format/afp/decompile.py
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@ -1703,9 +1703,9 @@ class ByteCodeDecompiler(VerboseOutput):
# Now, lets do the same with the right, and the first one we encounter that's visited is our guy.
candidates = [right] if right in chunks_by_id else []
while candidates:
possible_candidates = [c for c in candidates if c in visited]
possible_candidates = {c for c in candidates if c in visited}
if len(possible_candidates) == 1:
return possible_candidates[0]
return possible_candidates.pop()
if len(possible_candidates) > 1:
# This shouldn't be possible, I don't think? Let's enforce it as an invariant because I don't know what it means if this happens.
raise Exception(f"Logic error, found too many candidates {possible_candidates} as shallowest successor to {start_chunk}!")
@ -1993,8 +1993,18 @@ class ByteCodeDecompiler(VerboseOutput):
}[action.comparison]
return TwoParameterIf(conditional1, comp, conditional2)
elif action.comparison in [IfAction.BITAND, IfAction.NOT_BITAND]:
conditional2 = get_stack()
conditional1 = get_stack()
comp = TwoParameterIf.NOT_EQUALS if action.comparison == IfAction.BITAND else TwoParameterIf.EQUALS
return TwoParameterIf(
ArithmeticExpression(conditional1, "&", conditional2),
comp,
0,
)
else:
raise Exception(f"TODO: {action}")
raise Exception(f"Logic error, unknown if action {action}!")
# TODO: Everywhere that we assert on a type needs to be updated to check for a borrow, and if the borrow
# exists we should instead set the borrow to check for that type.
@ -2734,8 +2744,8 @@ class ByteCodeDecompiler(VerboseOutput):
elif isinstance(statement, IfStatement):
new_statement = do(statement)
if new_statement and isinstance(new_statement, IfStatement):
statement.true_statements = self.__walk(statement.true_statements, do)
statement.false_statements = self.__walk(statement.false_statements, do)
statement.true_statements = self.__walk(new_statement.true_statements, do)
statement.false_statements = self.__walk(new_statement.false_statements, do)
new_statements.append(new_statement)
elif new_statement is not None:
# Cannot currently handle changing a statement with children to a new