mirror of https://github.com/python/cpython
447 lines
17 KiB
Python
447 lines
17 KiB
Python
import dis
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import unittest
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from test.bytecode_helper import BytecodeTestCase
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def count_instr_recursively(f, opname):
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count = 0
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for instr in dis.get_instructions(f):
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if instr.opname == opname:
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count += 1
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if hasattr(f, '__code__'):
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f = f.__code__
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for c in f.co_consts:
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if hasattr(c, 'co_code'):
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count += count_instr_recursively(c, opname)
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return count
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class TestTranforms(BytecodeTestCase):
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def check_jump_targets(self, code):
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instructions = list(dis.get_instructions(code))
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targets = {instr.offset: instr for instr in instructions}
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for instr in instructions:
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if 'JUMP_' not in instr.opname:
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continue
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tgt = targets[instr.argval]
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# jump to unconditional jump
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if tgt.opname in ('JUMP_ABSOLUTE', 'JUMP_FORWARD'):
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self.fail(f'{instr.opname} at {instr.offset} '
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f'jumps to {tgt.opname} at {tgt.offset}')
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# unconditional jump to RETURN_VALUE
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if (instr.opname in ('JUMP_ABSOLUTE', 'JUMP_FORWARD') and
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tgt.opname == 'RETURN_VALUE'):
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self.fail(f'{instr.opname} at {instr.offset} '
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f'jumps to {tgt.opname} at {tgt.offset}')
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# JUMP_IF_*_OR_POP jump to conditional jump
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if '_OR_POP' in instr.opname and 'JUMP_IF_' in tgt.opname:
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self.fail(f'{instr.opname} at {instr.offset} '
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f'jumps to {tgt.opname} at {tgt.offset}')
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def test_unot(self):
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# UNARY_NOT POP_JUMP_IF_FALSE --> POP_JUMP_IF_TRUE'
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def unot(x):
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if not x == 2:
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del x
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self.assertNotInBytecode(unot, 'UNARY_NOT')
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self.assertNotInBytecode(unot, 'POP_JUMP_IF_FALSE')
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self.assertInBytecode(unot, 'POP_JUMP_IF_TRUE')
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def test_elim_inversion_of_is_or_in(self):
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for line, cmp_op in (
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('not a is b', 'is not',),
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('not a in b', 'not in',),
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('not a is not b', 'is',),
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('not a not in b', 'in',),
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):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, 'COMPARE_OP', cmp_op)
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def test_global_as_constant(self):
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# LOAD_GLOBAL None/True/False --> LOAD_CONST None/True/False
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def f():
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x = None
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x = None
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return x
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def g():
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x = True
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return x
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def h():
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x = False
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return x
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for func, elem in ((f, None), (g, True), (h, False)):
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self.assertNotInBytecode(func, 'LOAD_GLOBAL')
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self.assertInBytecode(func, 'LOAD_CONST', elem)
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def f():
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'Adding a docstring made this test fail in Py2.5.0'
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return None
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self.assertNotInBytecode(f, 'LOAD_GLOBAL')
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self.assertInBytecode(f, 'LOAD_CONST', None)
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def test_while_one(self):
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# Skip over: LOAD_CONST trueconst POP_JUMP_IF_FALSE xx
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def f():
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while 1:
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pass
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return list
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for elem in ('LOAD_CONST', 'POP_JUMP_IF_FALSE'):
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self.assertNotInBytecode(f, elem)
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for elem in ('JUMP_ABSOLUTE',):
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self.assertInBytecode(f, elem)
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def test_pack_unpack(self):
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for line, elem in (
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('a, = a,', 'LOAD_CONST',),
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('a, b = a, b', 'ROT_TWO',),
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('a, b, c = a, b, c', 'ROT_THREE',),
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):
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code = compile(line,'','single')
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self.assertInBytecode(code, elem)
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self.assertNotInBytecode(code, 'BUILD_TUPLE')
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self.assertNotInBytecode(code, 'UNPACK_TUPLE')
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def test_folding_of_tuples_of_constants(self):
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for line, elem in (
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('a = 1,2,3', (1, 2, 3)),
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('("a","b","c")', ('a', 'b', 'c')),
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('a,b,c = 1,2,3', (1, 2, 3)),
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('(None, 1, None)', (None, 1, None)),
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('((1, 2), 3, 4)', ((1, 2), 3, 4)),
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):
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code = compile(line,'','single')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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self.assertNotInBytecode(code, 'BUILD_TUPLE')
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# Long tuples should be folded too.
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code = compile(repr(tuple(range(10000))),'','single')
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self.assertNotInBytecode(code, 'BUILD_TUPLE')
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# One LOAD_CONST for the tuple, one for the None return value
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load_consts = [instr for instr in dis.get_instructions(code)
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if instr.opname == 'LOAD_CONST']
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self.assertEqual(len(load_consts), 2)
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# Bug 1053819: Tuple of constants misidentified when presented with:
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# . . . opcode_with_arg 100 unary_opcode BUILD_TUPLE 1 . . .
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# The following would segfault upon compilation
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def crater():
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(~[
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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],)
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def test_folding_of_lists_of_constants(self):
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for line, elem in (
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# in/not in constants with BUILD_LIST should be folded to a tuple:
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('a in [1,2,3]', (1, 2, 3)),
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('a not in ["a","b","c"]', ('a', 'b', 'c')),
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('a in [None, 1, None]', (None, 1, None)),
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('a not in [(1, 2), 3, 4]', ((1, 2), 3, 4)),
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):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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self.assertNotInBytecode(code, 'BUILD_LIST')
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def test_folding_of_sets_of_constants(self):
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for line, elem in (
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# in/not in constants with BUILD_SET should be folded to a frozenset:
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('a in {1,2,3}', frozenset({1, 2, 3})),
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('a not in {"a","b","c"}', frozenset({'a', 'c', 'b'})),
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('a in {None, 1, None}', frozenset({1, None})),
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('a not in {(1, 2), 3, 4}', frozenset({(1, 2), 3, 4})),
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('a in {1, 2, 3, 3, 2, 1}', frozenset({1, 2, 3})),
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):
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code = compile(line, '', 'single')
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self.assertNotInBytecode(code, 'BUILD_SET')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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# Ensure that the resulting code actually works:
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def f(a):
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return a in {1, 2, 3}
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def g(a):
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return a not in {1, 2, 3}
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self.assertTrue(f(3))
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self.assertTrue(not f(4))
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self.assertTrue(not g(3))
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self.assertTrue(g(4))
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def test_folding_of_binops_on_constants(self):
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for line, elem in (
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('a = 2+3+4', 9), # chained fold
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('"@"*4', '@@@@'), # check string ops
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('a="abc" + "def"', 'abcdef'), # check string ops
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('a = 3**4', 81), # binary power
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('a = 3*4', 12), # binary multiply
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('a = 13//4', 3), # binary floor divide
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('a = 14%4', 2), # binary modulo
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('a = 2+3', 5), # binary add
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('a = 13-4', 9), # binary subtract
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('a = (12,13)[1]', 13), # binary subscr
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('a = 13 << 2', 52), # binary lshift
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('a = 13 >> 2', 3), # binary rshift
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('a = 13 & 7', 5), # binary and
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('a = 13 ^ 7', 10), # binary xor
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('a = 13 | 7', 15), # binary or
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):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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for instr in dis.get_instructions(code):
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self.assertFalse(instr.opname.startswith('BINARY_'))
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# Verify that unfoldables are skipped
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code = compile('a=2+"b"', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', 2)
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self.assertInBytecode(code, 'LOAD_CONST', 'b')
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# Verify that large sequences do not result from folding
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code = compile('a="x"*10000', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', 10000)
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self.assertNotIn("x"*10000, code.co_consts)
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code = compile('a=1<<1000', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', 1000)
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self.assertNotIn(1<<1000, code.co_consts)
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code = compile('a=2**1000', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', 1000)
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self.assertNotIn(2**1000, code.co_consts)
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def test_binary_subscr_on_unicode(self):
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# valid code get optimized
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code = compile('"foo"[0]', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', 'f')
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self.assertNotInBytecode(code, 'BINARY_SUBSCR')
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code = compile('"\u0061\uffff"[1]', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', '\uffff')
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self.assertNotInBytecode(code,'BINARY_SUBSCR')
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# With PEP 393, non-BMP char get optimized
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code = compile('"\U00012345"[0]', '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', '\U00012345')
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self.assertNotInBytecode(code, 'BINARY_SUBSCR')
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# invalid code doesn't get optimized
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# out of range
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code = compile('"fuu"[10]', '', 'single')
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self.assertInBytecode(code, 'BINARY_SUBSCR')
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def test_folding_of_unaryops_on_constants(self):
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for line, elem in (
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('-0.5', -0.5), # unary negative
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('-0.0', -0.0), # -0.0
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('-(1.0-1.0)', -0.0), # -0.0 after folding
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('-0', 0), # -0
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('~-2', 1), # unary invert
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('+1', 1), # unary positive
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):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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for instr in dis.get_instructions(code):
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self.assertFalse(instr.opname.startswith('UNARY_'))
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# Check that -0.0 works after marshaling
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def negzero():
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return -(1.0-1.0)
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for instr in dis.get_instructions(code):
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self.assertFalse(instr.opname.startswith('UNARY_'))
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# Verify that unfoldables are skipped
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for line, elem, opname in (
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('-"abc"', 'abc', 'UNARY_NEGATIVE'),
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('~"abc"', 'abc', 'UNARY_INVERT'),
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):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, 'LOAD_CONST', elem)
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self.assertInBytecode(code, opname)
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def test_elim_extra_return(self):
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# RETURN LOAD_CONST None RETURN --> RETURN
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def f(x):
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return x
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self.assertNotInBytecode(f, 'LOAD_CONST', None)
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returns = [instr for instr in dis.get_instructions(f)
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if instr.opname == 'RETURN_VALUE']
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self.assertEqual(len(returns), 1)
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def test_elim_jump_to_return(self):
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# JUMP_FORWARD to RETURN --> RETURN
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def f(cond, true_value, false_value):
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# Intentionally use two-line expression to test issue37213.
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return (true_value if cond
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else false_value)
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self.check_jump_targets(f)
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self.assertNotInBytecode(f, 'JUMP_FORWARD')
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self.assertNotInBytecode(f, 'JUMP_ABSOLUTE')
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returns = [instr for instr in dis.get_instructions(f)
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if instr.opname == 'RETURN_VALUE']
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self.assertEqual(len(returns), 2)
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def test_elim_jump_to_uncond_jump(self):
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# POP_JUMP_IF_FALSE to JUMP_FORWARD --> POP_JUMP_IF_FALSE to non-jump
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def f():
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if a:
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# Intentionally use two-line expression to test issue37213.
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if (c
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or d):
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foo()
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else:
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baz()
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self.check_jump_targets(f)
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def test_elim_jump_to_uncond_jump2(self):
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# POP_JUMP_IF_FALSE to JUMP_ABSOLUTE --> POP_JUMP_IF_FALSE to non-jump
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def f():
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while a:
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# Intentionally use two-line expression to test issue37213.
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if (c
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or d):
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a = foo()
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self.check_jump_targets(f)
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def test_elim_jump_to_uncond_jump3(self):
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# Intentionally use two-line expressions to test issue37213.
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# JUMP_IF_FALSE_OR_POP to JUMP_IF_FALSE_OR_POP --> JUMP_IF_FALSE_OR_POP to non-jump
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def f(a, b, c):
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return ((a and b)
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and c)
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self.check_jump_targets(f)
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self.assertEqual(count_instr_recursively(f, 'JUMP_IF_FALSE_OR_POP'), 2)
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# JUMP_IF_TRUE_OR_POP to JUMP_IF_TRUE_OR_POP --> JUMP_IF_TRUE_OR_POP to non-jump
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def f(a, b, c):
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return ((a or b)
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or c)
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self.check_jump_targets(f)
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self.assertEqual(count_instr_recursively(f, 'JUMP_IF_TRUE_OR_POP'), 2)
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# JUMP_IF_FALSE_OR_POP to JUMP_IF_TRUE_OR_POP --> POP_JUMP_IF_FALSE to non-jump
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def f(a, b, c):
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return ((a and b)
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or c)
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self.check_jump_targets(f)
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self.assertNotInBytecode(f, 'JUMP_IF_FALSE_OR_POP')
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self.assertInBytecode(f, 'JUMP_IF_TRUE_OR_POP')
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self.assertInBytecode(f, 'POP_JUMP_IF_FALSE')
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# JUMP_IF_TRUE_OR_POP to JUMP_IF_FALSE_OR_POP --> POP_JUMP_IF_TRUE to non-jump
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def f(a, b, c):
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return ((a or b)
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and c)
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self.check_jump_targets(f)
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self.assertNotInBytecode(f, 'JUMP_IF_TRUE_OR_POP')
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self.assertInBytecode(f, 'JUMP_IF_FALSE_OR_POP')
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self.assertInBytecode(f, 'POP_JUMP_IF_TRUE')
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def test_elim_jump_after_return1(self):
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# Eliminate dead code: jumps immediately after returns can't be reached
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def f(cond1, cond2):
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if cond1: return 1
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if cond2: return 2
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while 1:
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return 3
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while 1:
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if cond1: return 4
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return 5
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return 6
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self.assertNotInBytecode(f, 'JUMP_FORWARD')
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self.assertNotInBytecode(f, 'JUMP_ABSOLUTE')
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returns = [instr for instr in dis.get_instructions(f)
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if instr.opname == 'RETURN_VALUE']
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self.assertLessEqual(len(returns), 6)
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def test_elim_jump_after_return2(self):
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# Eliminate dead code: jumps immediately after returns can't be reached
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def f(cond1, cond2):
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while 1:
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if cond1: return 4
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self.assertNotInBytecode(f, 'JUMP_FORWARD')
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# There should be one jump for the while loop.
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returns = [instr for instr in dis.get_instructions(f)
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if instr.opname == 'JUMP_ABSOLUTE']
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self.assertEqual(len(returns), 1)
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returns = [instr for instr in dis.get_instructions(f)
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if instr.opname == 'RETURN_VALUE']
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self.assertLessEqual(len(returns), 2)
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def test_make_function_doesnt_bail(self):
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def f():
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def g()->1+1:
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pass
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return g
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self.assertNotInBytecode(f, 'BINARY_ADD')
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def test_constant_folding(self):
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# Issue #11244: aggressive constant folding.
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exprs = [
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'3 * -5',
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'-3 * 5',
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'2 * (3 * 4)',
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'(2 * 3) * 4',
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'(-1, 2, 3)',
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'(1, -2, 3)',
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'(1, 2, -3)',
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'(1, 2, -3) * 6',
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'lambda x: x in {(3 * -5) + (-1 - 6), (1, -2, 3) * 2, None}',
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]
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for e in exprs:
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code = compile(e, '', 'single')
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for instr in dis.get_instructions(code):
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self.assertFalse(instr.opname.startswith('UNARY_'))
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self.assertFalse(instr.opname.startswith('BINARY_'))
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self.assertFalse(instr.opname.startswith('BUILD_'))
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def test_in_literal_list(self):
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def containtest():
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return x in [a, b]
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self.assertEqual(count_instr_recursively(containtest, 'BUILD_LIST'), 0)
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def test_iterate_literal_list(self):
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def forloop():
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for x in [a, b]:
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pass
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self.assertEqual(count_instr_recursively(forloop, 'BUILD_LIST'), 0)
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def test_condition_with_binop_with_bools(self):
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def f():
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if True or False:
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return 1
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return 0
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self.assertEqual(f(), 1)
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def test_if_with_if_expression(self):
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# Check bpo-37289
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def f(x):
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if (True if x else False):
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return True
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return False
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self.assertTrue(f(True))
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class TestBuglets(unittest.TestCase):
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def test_bug_11510(self):
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# folded constant set optimization was commingled with the tuple
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# unpacking optimization which would fail if the set had duplicate
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# elements so that the set length was unexpected
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def f():
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x, y = {1, 1}
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return x, y
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with self.assertRaises(ValueError):
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f()
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if __name__ == "__main__":
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unittest.main()
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