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1import dis
2from test.support.import_helper import import_module
3import unittest
4
5_opcode = import_module("_opcode")
6from _opcode import stack_effect
7
8
9class OpcodeTests(unittest.TestCase):
10
11    def test_stack_effect(self):
12        self.assertEqual(stack_effect(dis.opmap['POP_TOP']), -1)
13        self.assertEqual(stack_effect(dis.opmap['DUP_TOP_TWO']), 2)
14        self.assertEqual(stack_effect(dis.opmap['BUILD_SLICE'], 0), -1)
15        self.assertEqual(stack_effect(dis.opmap['BUILD_SLICE'], 1), -1)
16        self.assertEqual(stack_effect(dis.opmap['BUILD_SLICE'], 3), -2)
17        self.assertRaises(ValueError, stack_effect, 30000)
18        self.assertRaises(ValueError, stack_effect, dis.opmap['BUILD_SLICE'])
19        self.assertRaises(ValueError, stack_effect, dis.opmap['POP_TOP'], 0)
20        # All defined opcodes
21        for name, code in dis.opmap.items():
22            with self.subTest(opname=name):
23                if code < dis.HAVE_ARGUMENT:
24                    stack_effect(code)
25                    self.assertRaises(ValueError, stack_effect, code, 0)
26                else:
27                    stack_effect(code, 0)
28                    self.assertRaises(ValueError, stack_effect, code)
29        # All not defined opcodes
30        for code in set(range(256)) - set(dis.opmap.values()):
31            with self.subTest(opcode=code):
32                self.assertRaises(ValueError, stack_effect, code)
33                self.assertRaises(ValueError, stack_effect, code, 0)
34
35    def test_stack_effect_jump(self):
36        JUMP_IF_TRUE_OR_POP = dis.opmap['JUMP_IF_TRUE_OR_POP']
37        self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0), 0)
38        self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0, jump=True), 0)
39        self.assertEqual(stack_effect(JUMP_IF_TRUE_OR_POP, 0, jump=False), -1)
40        FOR_ITER = dis.opmap['FOR_ITER']
41        self.assertEqual(stack_effect(FOR_ITER, 0), 1)
42        self.assertEqual(stack_effect(FOR_ITER, 0, jump=True), -1)
43        self.assertEqual(stack_effect(FOR_ITER, 0, jump=False), 1)
44        JUMP_FORWARD = dis.opmap['JUMP_FORWARD']
45        self.assertEqual(stack_effect(JUMP_FORWARD, 0), 0)
46        self.assertEqual(stack_effect(JUMP_FORWARD, 0, jump=True), 0)
47        self.assertEqual(stack_effect(JUMP_FORWARD, 0, jump=False), 0)
48        # All defined opcodes
49        has_jump = dis.hasjabs + dis.hasjrel
50        for name, code in dis.opmap.items():
51            with self.subTest(opname=name):
52                if code < dis.HAVE_ARGUMENT:
53                    common = stack_effect(code)
54                    jump = stack_effect(code, jump=True)
55                    nojump = stack_effect(code, jump=False)
56                else:
57                    common = stack_effect(code, 0)
58                    jump = stack_effect(code, 0, jump=True)
59                    nojump = stack_effect(code, 0, jump=False)
60                if code in has_jump:
61                    self.assertEqual(common, max(jump, nojump))
62                else:
63                    self.assertEqual(jump, common)
64                    self.assertEqual(nojump, common)
65
66
67if __name__ == "__main__":
68    unittest.main()
69