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iftstmt reduce rule for 2.6:

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In ifsmt there can be a JUMP_ABSOLUTE right before the endif and a jump
the endif doesn't fall through to the place after the endif.
This commit is contained in:
rocky
2022-08-24 05:26:26 -04:00
parent 3cc51aa37f
commit 765b0149ea
1 changed files with 13 additions and 5 deletions
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18
uncompyle6/parsers/reducecheck/ifstmt2.py
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@@ -6,7 +6,6 @@ If statement reduction check for Python 2.6 (and older?)
def ifstmt2(self, lhs, n, rule, ast, tokens, first, last):
# print("XXX", first, last)
# for t in range(first, last):
# print(tokens[t])
# print("=" * 30)
@@ -61,16 +60,25 @@ def ifstmt2(self, lhs, n, rule, ast, tokens, first, last):
if testexpr[0] in ("testtrue", "testfalse"):
test = testexpr[0]
if len(test) > 1 and test[1].kind.startswith("jmp_"):
jmp_target = int(test[1][0].pattr)
jmp = test[1]
if len(test) > 1 and jmp.kind.startswith("jmp_"):
jmp_target = int(jmp[0].pattr)
if last == len(tokens):
last -= 1
if_end_offset = tokens[last].off2int(prefer_last=False)
if (
tokens[first].off2int(prefer_last=True)
<= jmp_target
< tokens[last].off2int(prefer_last=False)
< if_end_offset
):
return True
# In 2.6 (and before?) we need to check if the previous instruction
# is a jump to the last token. If so, testexpr is negated? and so
# jmp_target < if_end_offset.
previous_inst_index = self.offset2inst_index[jmp_target] - 1
previous_inst = self.insts[previous_inst_index]
if previous_inst.opname != "JUMP_ABSOLUTE" and previous_inst.argval != if_end_offset:
return True
# jmp_target less than tokens[first] is okay - is to a loop
# jmp_target equal tokens[last] is also okay: normal non-optimized non-loop jump
if jmp_target > tokens[last].off2int():