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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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22
Lib/test/test__opcode.py Normal file
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import dis
import _opcode
from test.support import run_unittest
import unittest
class OpcodeTests(unittest.TestCase):
def test_stack_effect(self):
self.assertEqual(_opcode.stack_effect(dis.opmap['POP_TOP']), -1)
self.assertEqual(_opcode.stack_effect(dis.opmap['DUP_TOP_TWO']), 2)
self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 0), -1)
self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 1), -1)
self.assertEqual(_opcode.stack_effect(dis.opmap['BUILD_SLICE'], 3), -2)
self.assertRaises(ValueError, _opcode.stack_effect, 30000)
self.assertRaises(ValueError, _opcode.stack_effect, dis.opmap['BUILD_SLICE'])
self.assertRaises(ValueError, _opcode.stack_effect, dis.opmap['POP_TOP'], 0)
def test_main():
run_unittest(OpcodeTests)
if __name__ == "__main__":
test_main()