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35 lines
1.4 KiB
Python
35 lines
1.4 KiB
Python
# Copyright (c) 2020 Rocky Bernstein
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def or_check(self, lhs, n, rule, ast, tokens, first, last):
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if rule == ("or", ("expr", "jmp_true", "expr")):
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if tokens[last] in (
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"LOAD_ASSERT",
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"RAISE_VARARGS_1",
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):
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return True
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# The following test is be the most accurate. It prevents "or" from being
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# mistake for part of an "assert".
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# There one might conceivably be "expr or AssertionError" code, but the
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# likelihood of that is vanishingly small.
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# The below then is useful until we get better control-flow analysis.
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# Note it is too hard in the scanner right nowto turn the LOAD_GLOBAL into
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# int LOAD_ASSERT, however in 3.9ish code generation does this by default.
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load_global = tokens[last-1]
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if load_global == "LOAD_GLOBAL" and load_global.attr == "AssertionError":
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return True
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jmp_true_target = ast[1][0].attr
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jmp_false = tokens[last]
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# If the jmp is backwards
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if jmp_false == "POP_JUMP_IF_FALSE":
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if jmp_false.attr < jmp_false.off2int():
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# For a backwards loop, well compare to the instruction *after*
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# then POP_JUMP...
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jmp_false = tokens[last+1]
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return not (jmp_true_target == jmp_false.off2int() or
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jmp_true_target < tokens[first].off2int())
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return False
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