/usr/lib/python3.4/test/test_peepholer.py is in libpython3.4-testsuite 3.4.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 | import dis
import re
import sys
from io import StringIO
import unittest
from math import copysign
from test.bytecode_helper import BytecodeTestCase
class TestTranforms(BytecodeTestCase):
def test_unot(self):
# UNARY_NOT POP_JUMP_IF_FALSE --> POP_JUMP_IF_TRUE'
def unot(x):
if not x == 2:
del x
self.assertNotInBytecode(unot, 'UNARY_NOT')
self.assertNotInBytecode(unot, 'POP_JUMP_IF_FALSE')
self.assertInBytecode(unot, 'POP_JUMP_IF_TRUE')
def test_elim_inversion_of_is_or_in(self):
for line, cmp_op in (
('not a is b', 'is not',),
('not a in b', 'not in',),
('not a is not b', 'is',),
('not a not in b', 'in',),
):
code = compile(line, '', 'single')
self.assertInBytecode(code, 'COMPARE_OP', cmp_op)
def test_global_as_constant(self):
# LOAD_GLOBAL None/True/False --> LOAD_CONST None/True/False
def f(x):
None
None
return x
def g(x):
True
return x
def h(x):
False
return x
for func, elem in ((f, None), (g, True), (h, False)):
self.assertNotInBytecode(func, 'LOAD_GLOBAL')
self.assertInBytecode(func, 'LOAD_CONST', elem)
def f():
'Adding a docstring made this test fail in Py2.5.0'
return None
self.assertNotInBytecode(f, 'LOAD_GLOBAL')
self.assertInBytecode(f, 'LOAD_CONST', None)
def test_while_one(self):
# Skip over: LOAD_CONST trueconst POP_JUMP_IF_FALSE xx
def f():
while 1:
pass
return list
for elem in ('LOAD_CONST', 'POP_JUMP_IF_FALSE'):
self.assertNotInBytecode(f, elem)
for elem in ('JUMP_ABSOLUTE',):
self.assertInBytecode(f, elem)
def test_pack_unpack(self):
for line, elem in (
('a, = a,', 'LOAD_CONST',),
('a, b = a, b', 'ROT_TWO',),
('a, b, c = a, b, c', 'ROT_THREE',),
):
code = compile(line,'','single')
self.assertInBytecode(code, elem)
self.assertNotInBytecode(code, 'BUILD_TUPLE')
self.assertNotInBytecode(code, 'UNPACK_TUPLE')
def test_folding_of_tuples_of_constants(self):
for line, elem in (
('a = 1,2,3', (1, 2, 3)),
('("a","b","c")', ('a', 'b', 'c')),
('a,b,c = 1,2,3', (1, 2, 3)),
('(None, 1, None)', (None, 1, None)),
('((1, 2), 3, 4)', ((1, 2), 3, 4)),
):
code = compile(line,'','single')
self.assertInBytecode(code, 'LOAD_CONST', elem)
self.assertNotInBytecode(code, 'BUILD_TUPLE')
# Long tuples should be folded too.
code = compile(repr(tuple(range(10000))),'','single')
self.assertNotInBytecode(code, 'BUILD_TUPLE')
# One LOAD_CONST for the tuple, one for the None return value
load_consts = [instr for instr in dis.get_instructions(code)
if instr.opname == 'LOAD_CONST']
self.assertEqual(len(load_consts), 2)
# Bug 1053819: Tuple of constants misidentified when presented with:
# . . . opcode_with_arg 100 unary_opcode BUILD_TUPLE 1 . . .
# The following would segfault upon compilation
def crater():
(~[
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
],)
def test_folding_of_lists_of_constants(self):
for line, elem in (
# in/not in constants with BUILD_LIST should be folded to a tuple:
('a in [1,2,3]', (1, 2, 3)),
('a not in ["a","b","c"]', ('a', 'b', 'c')),
('a in [None, 1, None]', (None, 1, None)),
('a not in [(1, 2), 3, 4]', ((1, 2), 3, 4)),
):
code = compile(line, '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', elem)
self.assertNotInBytecode(code, 'BUILD_LIST')
def test_folding_of_sets_of_constants(self):
for line, elem in (
# in/not in constants with BUILD_SET should be folded to a frozenset:
('a in {1,2,3}', frozenset({1, 2, 3})),
('a not in {"a","b","c"}', frozenset({'a', 'c', 'b'})),
('a in {None, 1, None}', frozenset({1, None})),
('a not in {(1, 2), 3, 4}', frozenset({(1, 2), 3, 4})),
('a in {1, 2, 3, 3, 2, 1}', frozenset({1, 2, 3})),
):
code = compile(line, '', 'single')
self.assertNotInBytecode(code, 'BUILD_SET')
self.assertInBytecode(code, 'LOAD_CONST', elem)
# Ensure that the resulting code actually works:
def f(a):
return a in {1, 2, 3}
def g(a):
return a not in {1, 2, 3}
self.assertTrue(f(3))
self.assertTrue(not f(4))
self.assertTrue(not g(3))
self.assertTrue(g(4))
def test_folding_of_binops_on_constants(self):
for line, elem in (
('a = 2+3+4', 9), # chained fold
('"@"*4', '@@@@'), # check string ops
('a="abc" + "def"', 'abcdef'), # check string ops
('a = 3**4', 81), # binary power
('a = 3*4', 12), # binary multiply
('a = 13//4', 3), # binary floor divide
('a = 14%4', 2), # binary modulo
('a = 2+3', 5), # binary add
('a = 13-4', 9), # binary subtract
('a = (12,13)[1]', 13), # binary subscr
('a = 13 << 2', 52), # binary lshift
('a = 13 >> 2', 3), # binary rshift
('a = 13 & 7', 5), # binary and
('a = 13 ^ 7', 10), # binary xor
('a = 13 | 7', 15), # binary or
):
code = compile(line, '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', elem)
for instr in dis.get_instructions(code):
self.assertFalse(instr.opname.startswith('BINARY_'))
# Verify that unfoldables are skipped
code = compile('a=2+"b"', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 2)
self.assertInBytecode(code, 'LOAD_CONST', 'b')
# Verify that large sequences do not result from folding
code = compile('a="x"*1000', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 1000)
def test_binary_subscr_on_unicode(self):
# valid code get optimized
code = compile('"foo"[0]', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', 'f')
self.assertNotInBytecode(code, 'BINARY_SUBSCR')
code = compile('"\u0061\uffff"[1]', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', '\uffff')
self.assertNotInBytecode(code,'BINARY_SUBSCR')
# With PEP 393, non-BMP char get optimized
code = compile('"\U00012345"[0]', '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', '\U00012345')
self.assertNotInBytecode(code, 'BINARY_SUBSCR')
# invalid code doesn't get optimized
# out of range
code = compile('"fuu"[10]', '', 'single')
self.assertInBytecode(code, 'BINARY_SUBSCR')
def test_folding_of_unaryops_on_constants(self):
for line, elem in (
('-0.5', -0.5), # unary negative
('-0.0', -0.0), # -0.0
('-(1.0-1.0)', -0.0), # -0.0 after folding
('-0', 0), # -0
('~-2', 1), # unary invert
('+1', 1), # unary positive
):
code = compile(line, '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', elem)
for instr in dis.get_instructions(code):
self.assertFalse(instr.opname.startswith('UNARY_'))
# Check that -0.0 works after marshaling
def negzero():
return -(1.0-1.0)
for instr in dis.get_instructions(code):
self.assertFalse(instr.opname.startswith('UNARY_'))
# Verify that unfoldables are skipped
for line, elem, opname in (
('-"abc"', 'abc', 'UNARY_NEGATIVE'),
('~"abc"', 'abc', 'UNARY_INVERT'),
):
code = compile(line, '', 'single')
self.assertInBytecode(code, 'LOAD_CONST', elem)
self.assertInBytecode(code, opname)
def test_elim_extra_return(self):
# RETURN LOAD_CONST None RETURN --> RETURN
def f(x):
return x
self.assertNotInBytecode(f, 'LOAD_CONST', None)
returns = [instr for instr in dis.get_instructions(f)
if instr.opname == 'RETURN_VALUE']
self.assertEqual(len(returns), 1)
def test_elim_jump_to_return(self):
# JUMP_FORWARD to RETURN --> RETURN
def f(cond, true_value, false_value):
return true_value if cond else false_value
self.assertNotInBytecode(f, 'JUMP_FORWARD')
self.assertNotInBytecode(f, 'JUMP_ABSOLUTE')
returns = [instr for instr in dis.get_instructions(f)
if instr.opname == 'RETURN_VALUE']
self.assertEqual(len(returns), 2)
def test_elim_jump_after_return1(self):
# Eliminate dead code: jumps immediately after returns can't be reached
def f(cond1, cond2):
if cond1: return 1
if cond2: return 2
while 1:
return 3
while 1:
if cond1: return 4
return 5
return 6
self.assertNotInBytecode(f, 'JUMP_FORWARD')
self.assertNotInBytecode(f, 'JUMP_ABSOLUTE')
returns = [instr for instr in dis.get_instructions(f)
if instr.opname == 'RETURN_VALUE']
self.assertEqual(len(returns), 6)
def test_elim_jump_after_return2(self):
# Eliminate dead code: jumps immediately after returns can't be reached
def f(cond1, cond2):
while 1:
if cond1: return 4
self.assertNotInBytecode(f, 'JUMP_FORWARD')
# There should be one jump for the while loop.
returns = [instr for instr in dis.get_instructions(f)
if instr.opname == 'JUMP_ABSOLUTE']
self.assertEqual(len(returns), 1)
returns = [instr for instr in dis.get_instructions(f)
if instr.opname == 'RETURN_VALUE']
self.assertEqual(len(returns), 2)
def test_make_function_doesnt_bail(self):
def f():
def g()->1+1:
pass
return g
self.assertNotInBytecode(f, 'BINARY_ADD')
def test_constant_folding(self):
# Issue #11244: aggressive constant folding.
exprs = [
'3 * -5',
'-3 * 5',
'2 * (3 * 4)',
'(2 * 3) * 4',
'(-1, 2, 3)',
'(1, -2, 3)',
'(1, 2, -3)',
'(1, 2, -3) * 6',
'lambda x: x in {(3 * -5) + (-1 - 6), (1, -2, 3) * 2, None}',
]
for e in exprs:
code = compile(e, '', 'single')
for instr in dis.get_instructions(code):
self.assertFalse(instr.opname.startswith('UNARY_'))
self.assertFalse(instr.opname.startswith('BINARY_'))
self.assertFalse(instr.opname.startswith('BUILD_'))
class TestBuglets(unittest.TestCase):
def test_bug_11510(self):
# folded constant set optimization was commingled with the tuple
# unpacking optimization which would fail if the set had duplicate
# elements so that the set length was unexpected
def f():
x, y = {1, 1}
return x, y
with self.assertRaises(ValueError):
f()
def test_main(verbose=None):
import sys
from test import support
test_classes = (TestTranforms, TestBuglets)
support.run_unittest(*test_classes)
# verify reference counting
if verbose and hasattr(sys, 'gettotalrefcount'):
import gc
counts = [None] * 5
for i in range(len(counts)):
support.run_unittest(*test_classes)
gc.collect()
counts[i] = sys.gettotalrefcount()
print(counts)
if __name__ == "__main__":
test_main(verbose=True)
|