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More 2.7 reduction checks for conditionals:

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Specficially for "and" and "laststmtl"
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rocky
2019-11-18 08:36:28 -05:00
parent a5e7eb19c6
commit d696443eb2
2 changed files with 30 additions and 1 deletions
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test/bytecode_2.7_run/04_assert_continue.pyc-notyet
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31
uncompyle6/parsers/parse27.py
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@@ -218,11 +218,13 @@ class Python27Parser(Python2Parser):
self.check_reduce["conditional"] = "AST"
# self.check_reduce["or"] = "AST"
self.check_reduce["raise_stmt1"] = "AST"
self.check_reduce["iflaststmtl"] = "AST"
self.check_reduce["list_if_not"] = "AST"
self.check_reduce["list_if"] = "AST"
self.check_reduce["comp_if"] = "AST"
self.check_reduce["if_expr_true"] = "tokens"
self.check_reduce["whilestmt"] = "tokens"
return
def reduce_is_invalid(self, rule, ast, tokens, first, last):
@@ -234,12 +236,21 @@ class Python27Parser(Python2Parser):
return invalid
if rule == ("and", ("expr", "jmp_false", "expr", "\\e_come_from_opt")):
# If the instruction after the instructions formin "and" is an "YIELD_VALUE"
# If the instruction after the instructions forming the "and" is an "YIELD_VALUE"
# then this is probably an "if" inside a comprehension.
if tokens[last] == "YIELD_VALUE":
# Note: We might also consider testing last+1 being "POP_TOP"
return True
# Test that jump_false jump somewhere beyond the end of the "and"
# it might not be exactly the end of the "and" because this and can
# be a part of a larger condition. Oddly in 2.7 there doesn't seem to be
# an optimization where the "and" jump_false is back to a loop.
jmp_false = ast[1]
if jmp_false[0] == "POP_JUMP_IF_FALSE":
if jmp_false[0].attr < tokens[last].offset:
return True
# Test that jmp_false jumps to the end of "and"
# or that it jumps to the same place as the end of "and"
jmp_false = ast[1][0]
@@ -270,6 +281,24 @@ class Python27Parser(Python2Parser):
return not (last >= len(tokens)
or jump_target == tokens[last].offset
or jump_target == next_offset(ast[-1].op, ast[-1].opc, ast[-1].offset))
elif rule == ("iflaststmtl", ("testexpr", "c_stmts")):
testexpr = ast[0]
if testexpr[0] == "testfalse":
testfalse = testexpr[0]
if testfalse[1] == "jmp_false":
jmp_false = testfalse[1]
if last == len(tokens):
last -= 1
while (isinstance(tokens[first].offset, str) and first < last):
first += 1
if first == last:
return True
while (first < last and isinstance(tokens[last].offset, str)):
last -= 1
return jmp_false[0].attr < tokens[last].offset
pass
pass
pass
elif rule == ("list_if_not", ("expr", "jmp_true", "list_iter")):
jump_inst = ast[1][0]
jump_offset = jump_inst.attr