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Issue #19722: Added opcode.stack_effect(), which accurately

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computes the stack effect of bytecode instructions.
This commit is contained in:
Larry Hastings 2013-11-23 14:49:22 -08:00
parent 8d0d369067
commit 3a9079742f
8 changed files with 177 additions and 8 deletions
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13
Lib/opcode.py
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@ -8,6 +8,19 @@ __all__ = ["cmp_op", "hasconst", "hasname", "hasjrel", "hasjabs",
"haslocal", "hascompare", "hasfree", "opname", "opmap",
"HAVE_ARGUMENT", "EXTENDED_ARG", "hasnargs"]
# It's a chicken-and-egg I'm afraid:
# We're imported before _opcode's made.
# With exception unheeded
# (stack_effect is not needed)
# Both our chickens and eggs are allayed.
# --Larry Hastings, 2013/11/23
try:
from _opcode import stack_effect
__all__.append('stack_effect')
except ImportError:
pass
cmp_op = ('<', '<=', '==', '!=', '>', '>=', 'in', 'not in', 'is',
'is not', 'exception match', 'BAD')