1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
import textwrap
from test.support.bytecode_helper import CodegenTestCase
# Tests for the code-generation stage of the compiler.
# Examine the un-optimized code generated from the AST.
class IsolatedCodeGenTests(CodegenTestCase):
def assertInstructionsMatch_recursive(self, insts, expected_insts):
expected_nested = [i for i in expected_insts if isinstance(i, list)]
expected_insts = [i for i in expected_insts if not isinstance(i, list)]
self.assertInstructionsMatch(insts, expected_insts)
self.assertEqual(len(insts.get_nested()), len(expected_nested))
for n_insts, n_expected in zip(insts.get_nested(), expected_nested):
self.assertInstructionsMatch_recursive(n_insts, n_expected)
def codegen_test(self, snippet, expected_insts):
import ast
a = ast.parse(snippet, "my_file.py", "exec")
insts = self.generate_code(a)
self.assertInstructionsMatch_recursive(insts, expected_insts)
def test_if_expression(self):
snippet = "42 if True else 24"
false_lbl = self.Label()
expected = [
('RESUME', 0, 0),
('LOAD_CONST', 0, 1),
('TO_BOOL', 0, 1),
('POP_JUMP_IF_FALSE', false_lbl := self.Label(), 1),
('LOAD_CONST', 1, 1),
('JUMP_NO_INTERRUPT', exit_lbl := self.Label()),
false_lbl,
('LOAD_CONST', 2, 1),
exit_lbl,
('POP_TOP', None),
('LOAD_CONST', 3),
('RETURN_VALUE', None),
]
self.codegen_test(snippet, expected)
def test_for_loop(self):
snippet = "for x in l:\n\tprint(x)"
false_lbl = self.Label()
expected = [
('RESUME', 0, 0),
('LOAD_NAME', 0, 1),
('GET_ITER', None, 1),
loop_lbl := self.Label(),
('FOR_ITER', exit_lbl := self.Label(), 1),
('STORE_NAME', 1, 1),
('LOAD_NAME', 2, 2),
('PUSH_NULL', None, 2),
('LOAD_NAME', 1, 2),
('CALL', 1, 2),
('POP_TOP', None),
('JUMP', loop_lbl),
exit_lbl,
('END_FOR', None),
('POP_TOP', None),
('LOAD_CONST', 0),
('RETURN_VALUE', None),
]
self.codegen_test(snippet, expected)
def test_function(self):
snippet = textwrap.dedent("""
def f(x):
return x + 42
""")
expected = [
# Function definition
('RESUME', 0),
('LOAD_CONST', 0),
('MAKE_FUNCTION', None),
('STORE_NAME', 0),
('LOAD_CONST', 1),
('RETURN_VALUE', None),
[
# Function body
('RESUME', 0),
('LOAD_FAST', 0),
('LOAD_CONST', 1),
('BINARY_OP', 0),
('RETURN_VALUE', None),
('LOAD_CONST', 0),
('RETURN_VALUE', None),
]
]
self.codegen_test(snippet, expected)
def test_nested_functions(self):
snippet = textwrap.dedent("""
def f():
def h():
return 12
def g():
x = 1
y = 2
z = 3
u = 4
return 42
""")
expected = [
# Function definition
('RESUME', 0),
('LOAD_CONST', 0),
('MAKE_FUNCTION', None),
('STORE_NAME', 0),
('LOAD_CONST', 1),
('RETURN_VALUE', None),
[
# Function body
('RESUME', 0),
('LOAD_CONST', 1),
('MAKE_FUNCTION', None),
('STORE_FAST', 0),
('LOAD_CONST', 2),
('MAKE_FUNCTION', None),
('STORE_FAST', 1),
('LOAD_CONST', 0),
('RETURN_VALUE', None),
[
('RESUME', 0),
('NOP', None),
('LOAD_CONST', 1),
('RETURN_VALUE', None),
('LOAD_CONST', 0),
('RETURN_VALUE', None),
],
[
('RESUME', 0),
('LOAD_CONST', 1),
('STORE_FAST', 0),
('LOAD_CONST', 2),
('STORE_FAST', 1),
('LOAD_CONST', 3),
('STORE_FAST', 2),
('LOAD_CONST', 4),
('STORE_FAST', 3),
('NOP', None),
('LOAD_CONST', 5),
('RETURN_VALUE', None),
('LOAD_CONST', 0),
('RETURN_VALUE', None),
],
],
]
self.codegen_test(snippet, expected)
def test_syntax_error__return_not_in_function(self):
snippet = "return 42"
with self.assertRaisesRegex(SyntaxError, "'return' outside function"):
self.codegen_test(snippet, None)
|
