mirror of https://github.com/python/cpython
1137 lines
42 KiB
Python
1137 lines
42 KiB
Python
import dis
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from itertools import combinations, product
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import sys
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import textwrap
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import unittest
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from test import support
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from test.support.bytecode_helper import BytecodeTestCase, CfgOptimizationTestCase
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def compile_pattern_with_fast_locals(pattern):
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source = textwrap.dedent(
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f"""
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def f(x):
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match x:
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case {pattern}:
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pass
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"""
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)
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namespace = {}
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exec(source, namespace)
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return namespace["f"].__code__
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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_BACKWARD', '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_BACKWARD', '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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def check_lnotab(self, code):
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"Check that the lnotab byte offsets are sensible."
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code = dis._get_code_object(code)
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lnotab = list(dis.findlinestarts(code))
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# Don't bother checking if the line info is sensible, because
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# most of the line info we can get at comes from lnotab.
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min_bytecode = min(t[0] for t in lnotab)
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max_bytecode = max(t[0] for t in lnotab)
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self.assertGreaterEqual(min_bytecode, 0)
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self.assertLess(max_bytecode, len(code.co_code))
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# This could conceivably test more (and probably should, as there
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# aren't very many tests of lnotab), if peepholer wasn't scheduled
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# to be replaced anyway.
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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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self.check_lnotab(unot)
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def test_elim_inversion_of_is_or_in(self):
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for line, cmp_op, invert in (
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('not a is b', 'IS_OP', 1,),
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('not a is not b', 'IS_OP', 0,),
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('not a in b', 'CONTAINS_OP', 1,),
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('not a not in b', 'CONTAINS_OP', 0,),
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):
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with self.subTest(line=line):
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code = compile(line, '', 'single')
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self.assertInBytecode(code, cmp_op, invert)
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self.check_lnotab(code)
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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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with self.subTest(func=func):
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self.assertNotInBytecode(func, 'LOAD_GLOBAL')
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self.assertInBytecode(func, 'LOAD_CONST', elem)
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self.check_lnotab(func)
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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, 'RETURN_CONST', None)
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self.check_lnotab(f)
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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_BACKWARD',):
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self.assertInBytecode(f, elem)
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self.check_lnotab(f)
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def test_pack_unpack(self):
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for line, elem in (
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('a, = a,', 'RETURN_CONST',),
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('a, b = a, b', 'SWAP',),
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('a, b, c = a, b, c', 'SWAP',),
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):
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with self.subTest(line=line):
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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_SEQUENCE')
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self.check_lnotab(code)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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), 1)
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self.check_lnotab(code)
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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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self.check_lnotab(crater)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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.check_lnotab(f)
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self.assertTrue(not g(3))
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self.assertTrue(g(4))
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self.check_lnotab(g)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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self.check_lnotab(code)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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(negzero):
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self.assertFalse(instr.opname.startswith('UNARY_'))
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self.check_lnotab(negzero)
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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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with self.subTest(line=line):
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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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self.check_lnotab(code)
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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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self.check_lnotab(f)
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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_BACKWARD')
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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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self.check_lnotab(f)
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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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self.check_lnotab(f)
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def test_elim_jump_to_uncond_jump2(self):
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# POP_JUMP_IF_FALSE to JUMP_BACKWARD --> 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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self.check_lnotab(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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# POP_JUMP_IF_FALSE to POP_JUMP_IF_FALSE --> 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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and c)
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self.check_jump_targets(f)
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self.check_lnotab(f)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 2)
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# POP_JUMP_IF_TRUE to POP_JUMP_IF_TRUE --> 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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or c)
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self.check_jump_targets(f)
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self.check_lnotab(f)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 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.check_lnotab(f)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 1)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 1)
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# POP_JUMP_IF_TRUE to POP_JUMP_IF_FALSE --> 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.check_lnotab(f)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_FALSE'), 1)
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self.assertEqual(count_instr_recursively(f, 'POP_JUMP_IF_TRUE'), 1)
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def test_elim_jump_to_uncond_jump4(self):
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def f():
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for i in range(5):
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if i > 3:
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print(i)
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self.check_jump_targets(f)
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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_BACKWARD')
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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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self.check_lnotab(f)
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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
|
|
self.assertNotInBytecode(f, 'BINARY_OP')
|
|
self.check_lnotab(f)
|
|
|
|
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:
|
|
with self.subTest(e=e):
|
|
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_'))
|
|
self.check_lnotab(code)
|
|
|
|
def test_in_literal_list(self):
|
|
def containtest():
|
|
return x in [a, b]
|
|
self.assertEqual(count_instr_recursively(containtest, 'BUILD_LIST'), 0)
|
|
self.check_lnotab(containtest)
|
|
|
|
def test_iterate_literal_list(self):
|
|
def forloop():
|
|
for x in [a, b]:
|
|
pass
|
|
self.assertEqual(count_instr_recursively(forloop, 'BUILD_LIST'), 0)
|
|
self.check_lnotab(forloop)
|
|
|
|
def test_condition_with_binop_with_bools(self):
|
|
def f():
|
|
if True or False:
|
|
return 1
|
|
return 0
|
|
self.assertEqual(f(), 1)
|
|
self.check_lnotab(f)
|
|
|
|
def test_if_with_if_expression(self):
|
|
# Check bpo-37289
|
|
def f(x):
|
|
if (True if x else False):
|
|
return True
|
|
return False
|
|
self.assertTrue(f(True))
|
|
self.check_lnotab(f)
|
|
|
|
def test_trailing_nops(self):
|
|
# Check the lnotab of a function that even after trivial
|
|
# optimization has trailing nops, which the lnotab adjustment has to
|
|
# handle properly (bpo-38115).
|
|
def f(x):
|
|
while 1:
|
|
return 3
|
|
while 1:
|
|
return 5
|
|
return 6
|
|
self.check_lnotab(f)
|
|
|
|
def test_assignment_idiom_in_comprehensions(self):
|
|
def listcomp():
|
|
return [y for x in a for y in [f(x)]]
|
|
self.assertEqual(count_instr_recursively(listcomp, 'FOR_ITER'), 1)
|
|
def setcomp():
|
|
return {y for x in a for y in [f(x)]}
|
|
self.assertEqual(count_instr_recursively(setcomp, 'FOR_ITER'), 1)
|
|
def dictcomp():
|
|
return {y: y for x in a for y in [f(x)]}
|
|
self.assertEqual(count_instr_recursively(dictcomp, 'FOR_ITER'), 1)
|
|
def genexpr():
|
|
return (y for x in a for y in [f(x)])
|
|
self.assertEqual(count_instr_recursively(genexpr, 'FOR_ITER'), 1)
|
|
|
|
@support.requires_resource('cpu')
|
|
def test_format_combinations(self):
|
|
flags = '-+ #0'
|
|
testcases = [
|
|
*product(('', '1234', 'абвг'), 'sra'),
|
|
*product((1234, -1234), 'duioxX'),
|
|
*product((1234.5678901, -1234.5678901), 'duifegFEG'),
|
|
*product((float('inf'), -float('inf')), 'fegFEG'),
|
|
]
|
|
width_precs = [
|
|
*product(('', '1', '30'), ('', '.', '.0', '.2')),
|
|
('', '.40'),
|
|
('30', '.40'),
|
|
]
|
|
for value, suffix in testcases:
|
|
for width, prec in width_precs:
|
|
for r in range(len(flags) + 1):
|
|
for spec in combinations(flags, r):
|
|
fmt = '%' + ''.join(spec) + width + prec + suffix
|
|
with self.subTest(fmt=fmt, value=value):
|
|
s1 = fmt % value
|
|
s2 = eval(f'{fmt!r} % (x,)', {'x': value})
|
|
self.assertEqual(s2, s1, f'{fmt = }')
|
|
|
|
def test_format_misc(self):
|
|
def format(fmt, *values):
|
|
vars = [f'x{i+1}' for i in range(len(values))]
|
|
if len(vars) == 1:
|
|
args = '(' + vars[0] + ',)'
|
|
else:
|
|
args = '(' + ', '.join(vars) + ')'
|
|
return eval(f'{fmt!r} % {args}', dict(zip(vars, values)))
|
|
|
|
self.assertEqual(format('string'), 'string')
|
|
self.assertEqual(format('x = %s!', 1234), 'x = 1234!')
|
|
self.assertEqual(format('x = %d!', 1234), 'x = 1234!')
|
|
self.assertEqual(format('x = %x!', 1234), 'x = 4d2!')
|
|
self.assertEqual(format('x = %f!', 1234), 'x = 1234.000000!')
|
|
self.assertEqual(format('x = %s!', 1234.5678901), 'x = 1234.5678901!')
|
|
self.assertEqual(format('x = %f!', 1234.5678901), 'x = 1234.567890!')
|
|
self.assertEqual(format('x = %d!', 1234.5678901), 'x = 1234!')
|
|
self.assertEqual(format('x = %s%% %%%%', 1234), 'x = 1234% %%')
|
|
self.assertEqual(format('x = %s!', '%% %s'), 'x = %% %s!')
|
|
self.assertEqual(format('x = %s, y = %d', 12, 34), 'x = 12, y = 34')
|
|
|
|
def test_format_errors(self):
|
|
with self.assertRaisesRegex(TypeError,
|
|
'not enough arguments for format string'):
|
|
eval("'%s' % ()")
|
|
with self.assertRaisesRegex(TypeError,
|
|
'not all arguments converted during string formatting'):
|
|
eval("'%s' % (x, y)", {'x': 1, 'y': 2})
|
|
with self.assertRaisesRegex(ValueError, 'incomplete format'):
|
|
eval("'%s%' % (x,)", {'x': 1234})
|
|
with self.assertRaisesRegex(ValueError, 'incomplete format'):
|
|
eval("'%s%%%' % (x,)", {'x': 1234})
|
|
with self.assertRaisesRegex(TypeError,
|
|
'not enough arguments for format string'):
|
|
eval("'%s%z' % (x,)", {'x': 1234})
|
|
with self.assertRaisesRegex(ValueError, 'unsupported format character'):
|
|
eval("'%s%z' % (x, 5)", {'x': 1234})
|
|
with self.assertRaisesRegex(TypeError, 'a real number is required, not str'):
|
|
eval("'%d' % (x,)", {'x': '1234'})
|
|
with self.assertRaisesRegex(TypeError, 'an integer is required, not float'):
|
|
eval("'%x' % (x,)", {'x': 1234.56})
|
|
with self.assertRaisesRegex(TypeError, 'an integer is required, not str'):
|
|
eval("'%x' % (x,)", {'x': '1234'})
|
|
with self.assertRaisesRegex(TypeError, 'must be real number, not str'):
|
|
eval("'%f' % (x,)", {'x': '1234'})
|
|
with self.assertRaisesRegex(TypeError,
|
|
'not enough arguments for format string'):
|
|
eval("'%s, %s' % (x, *y)", {'x': 1, 'y': []})
|
|
with self.assertRaisesRegex(TypeError,
|
|
'not all arguments converted during string formatting'):
|
|
eval("'%s, %s' % (x, *y)", {'x': 1, 'y': [2, 3]})
|
|
|
|
def test_static_swaps_unpack_two(self):
|
|
def f(a, b):
|
|
a, b = a, b
|
|
b, a = a, b
|
|
self.assertNotInBytecode(f, "SWAP")
|
|
|
|
def test_static_swaps_unpack_three(self):
|
|
def f(a, b, c):
|
|
a, b, c = a, b, c
|
|
a, c, b = a, b, c
|
|
b, a, c = a, b, c
|
|
b, c, a = a, b, c
|
|
c, a, b = a, b, c
|
|
c, b, a = a, b, c
|
|
self.assertNotInBytecode(f, "SWAP")
|
|
|
|
def test_static_swaps_match_mapping(self):
|
|
for a, b, c in product("_a", "_b", "_c"):
|
|
pattern = f"{{'a': {a}, 'b': {b}, 'c': {c}}}"
|
|
with self.subTest(pattern):
|
|
code = compile_pattern_with_fast_locals(pattern)
|
|
self.assertNotInBytecode(code, "SWAP")
|
|
|
|
def test_static_swaps_match_class(self):
|
|
forms = [
|
|
"C({}, {}, {})",
|
|
"C({}, {}, c={})",
|
|
"C({}, b={}, c={})",
|
|
"C(a={}, b={}, c={})"
|
|
]
|
|
for a, b, c in product("_a", "_b", "_c"):
|
|
for form in forms:
|
|
pattern = form.format(a, b, c)
|
|
with self.subTest(pattern):
|
|
code = compile_pattern_with_fast_locals(pattern)
|
|
self.assertNotInBytecode(code, "SWAP")
|
|
|
|
def test_static_swaps_match_sequence(self):
|
|
swaps = {"*_, b, c", "a, *_, c", "a, b, *_"}
|
|
forms = ["{}, {}, {}", "{}, {}, *{}", "{}, *{}, {}", "*{}, {}, {}"]
|
|
for a, b, c in product("_a", "_b", "_c"):
|
|
for form in forms:
|
|
pattern = form.format(a, b, c)
|
|
with self.subTest(pattern):
|
|
code = compile_pattern_with_fast_locals(pattern)
|
|
if pattern in swaps:
|
|
# If this fails... great! Remove this pattern from swaps
|
|
# to prevent regressing on any improvement:
|
|
self.assertInBytecode(code, "SWAP")
|
|
else:
|
|
self.assertNotInBytecode(code, "SWAP")
|
|
|
|
|
|
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_bpo_42057(self):
|
|
for i in range(10):
|
|
try:
|
|
raise Exception
|
|
except Exception or Exception:
|
|
pass
|
|
|
|
def test_bpo_45773_pop_jump_if_true(self):
|
|
compile("while True or spam: pass", "<test>", "exec")
|
|
|
|
def test_bpo_45773_pop_jump_if_false(self):
|
|
compile("while True or not spam: pass", "<test>", "exec")
|
|
|
|
|
|
class TestMarkingVariablesAsUnKnown(BytecodeTestCase):
|
|
|
|
def setUp(self):
|
|
self.addCleanup(sys.settrace, sys.gettrace())
|
|
sys.settrace(None)
|
|
|
|
def test_load_fast_known_simple(self):
|
|
def f():
|
|
x = 1
|
|
y = x + x
|
|
self.assertInBytecode(f, 'LOAD_FAST_LOAD_FAST')
|
|
|
|
def test_load_fast_unknown_simple(self):
|
|
def f():
|
|
if condition():
|
|
x = 1
|
|
print(x)
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK')
|
|
self.assertNotInBytecode(f, 'LOAD_FAST')
|
|
|
|
def test_load_fast_unknown_because_del(self):
|
|
def f():
|
|
x = 1
|
|
del x
|
|
print(x)
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK')
|
|
self.assertNotInBytecode(f, 'LOAD_FAST')
|
|
|
|
def test_load_fast_known_because_parameter(self):
|
|
def f1(x):
|
|
print(x)
|
|
self.assertInBytecode(f1, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f1, 'LOAD_FAST_CHECK')
|
|
|
|
def f2(*, x):
|
|
print(x)
|
|
self.assertInBytecode(f2, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f2, 'LOAD_FAST_CHECK')
|
|
|
|
def f3(*args):
|
|
print(args)
|
|
self.assertInBytecode(f3, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f3, 'LOAD_FAST_CHECK')
|
|
|
|
def f4(**kwargs):
|
|
print(kwargs)
|
|
self.assertInBytecode(f4, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f4, 'LOAD_FAST_CHECK')
|
|
|
|
def f5(x=0):
|
|
print(x)
|
|
self.assertInBytecode(f5, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f5, 'LOAD_FAST_CHECK')
|
|
|
|
def test_load_fast_known_because_already_loaded(self):
|
|
def f():
|
|
if condition():
|
|
x = 1
|
|
print(x)
|
|
print(x)
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK')
|
|
self.assertInBytecode(f, 'LOAD_FAST')
|
|
|
|
def test_load_fast_known_multiple_branches(self):
|
|
def f():
|
|
if condition():
|
|
x = 1
|
|
else:
|
|
x = 2
|
|
print(x)
|
|
self.assertInBytecode(f, 'LOAD_FAST')
|
|
self.assertNotInBytecode(f, 'LOAD_FAST_CHECK')
|
|
|
|
def test_load_fast_unknown_after_error(self):
|
|
def f():
|
|
try:
|
|
res = 1 / 0
|
|
except ZeroDivisionError:
|
|
pass
|
|
return res
|
|
# LOAD_FAST (known) still occurs in the no-exception branch.
|
|
# Assert that it doesn't occur in the LOAD_FAST_CHECK branch.
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK')
|
|
|
|
def test_load_fast_unknown_after_error_2(self):
|
|
def f():
|
|
try:
|
|
1 / 0
|
|
except:
|
|
print(a, b, c, d, e, f, g)
|
|
a = b = c = d = e = f = g = 1
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK')
|
|
self.assertNotInBytecode(f, 'LOAD_FAST')
|
|
|
|
def test_load_fast_too_many_locals(self):
|
|
# When there get to be too many locals to analyze completely,
|
|
# later locals are all converted to LOAD_FAST_CHECK, except
|
|
# when a store or prior load occurred in the same basicblock.
|
|
def f():
|
|
a00 = a01 = a02 = a03 = a04 = a05 = a06 = a07 = a08 = a09 = 1
|
|
a10 = a11 = a12 = a13 = a14 = a15 = a16 = a17 = a18 = a19 = 1
|
|
a20 = a21 = a22 = a23 = a24 = a25 = a26 = a27 = a28 = a29 = 1
|
|
a30 = a31 = a32 = a33 = a34 = a35 = a36 = a37 = a38 = a39 = 1
|
|
a40 = a41 = a42 = a43 = a44 = a45 = a46 = a47 = a48 = a49 = 1
|
|
a50 = a51 = a52 = a53 = a54 = a55 = a56 = a57 = a58 = a59 = 1
|
|
a60 = a61 = a62 = a63 = a64 = a65 = a66 = a67 = a68 = a69 = 1
|
|
a70 = a71 = a72 = a73 = a74 = a75 = a76 = a77 = a78 = a79 = 1
|
|
del a72, a73
|
|
print(a73)
|
|
print(a70, a71, a72, a73)
|
|
while True:
|
|
print(a00, a01, a62, a63)
|
|
print(a64, a65, a78, a79)
|
|
|
|
self.assertInBytecode(f, 'LOAD_FAST_LOAD_FAST', ("a00", "a01"))
|
|
self.assertNotInBytecode(f, 'LOAD_FAST_CHECK', "a00")
|
|
self.assertNotInBytecode(f, 'LOAD_FAST_CHECK', "a01")
|
|
for i in 62, 63:
|
|
# First 64 locals: analyze completely
|
|
self.assertInBytecode(f, 'LOAD_FAST', f"a{i:02}")
|
|
self.assertNotInBytecode(f, 'LOAD_FAST_CHECK', f"a{i:02}")
|
|
for i in 64, 65, 78, 79:
|
|
# Locals >=64 not in the same basicblock
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK', f"a{i:02}")
|
|
self.assertNotInBytecode(f, 'LOAD_FAST', f"a{i:02}")
|
|
for i in 70, 71:
|
|
# Locals >=64 in the same basicblock
|
|
self.assertInBytecode(f, 'LOAD_FAST', f"a{i:02}")
|
|
self.assertNotInBytecode(f, 'LOAD_FAST_CHECK', f"a{i:02}")
|
|
# del statements should invalidate within basicblocks.
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK', "a72")
|
|
self.assertNotInBytecode(f, 'LOAD_FAST', "a72")
|
|
# previous checked loads within a basicblock enable unchecked loads
|
|
self.assertInBytecode(f, 'LOAD_FAST_CHECK', "a73")
|
|
self.assertInBytecode(f, 'LOAD_FAST', "a73")
|
|
|
|
def test_setting_lineno_no_undefined(self):
|
|
code = textwrap.dedent("""\
|
|
def f():
|
|
x = y = 2
|
|
if not x:
|
|
return 4
|
|
for i in range(55):
|
|
x + 6
|
|
L = 7
|
|
L = 8
|
|
L = 9
|
|
L = 10
|
|
""")
|
|
ns = {}
|
|
exec(code, ns)
|
|
f = ns['f']
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
co_code = f.__code__.co_code
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 9:
|
|
frame.f_lineno = 3
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
sys.settrace(trace)
|
|
result = f()
|
|
self.assertIsNone(result)
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
self.assertEqual(f.__code__.co_code, co_code)
|
|
|
|
def test_setting_lineno_one_undefined(self):
|
|
code = textwrap.dedent("""\
|
|
def f():
|
|
x = y = 2
|
|
if not x:
|
|
return 4
|
|
for i in range(55):
|
|
x + 6
|
|
del x
|
|
L = 8
|
|
L = 9
|
|
L = 10
|
|
""")
|
|
ns = {}
|
|
exec(code, ns)
|
|
f = ns['f']
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
co_code = f.__code__.co_code
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 9:
|
|
frame.f_lineno = 3
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
e = r"assigning None to 1 unbound local"
|
|
with self.assertWarnsRegex(RuntimeWarning, e):
|
|
sys.settrace(trace)
|
|
result = f()
|
|
self.assertEqual(result, 4)
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
self.assertEqual(f.__code__.co_code, co_code)
|
|
|
|
def test_setting_lineno_two_undefined(self):
|
|
code = textwrap.dedent("""\
|
|
def f():
|
|
x = y = 2
|
|
if not x:
|
|
return 4
|
|
for i in range(55):
|
|
x + 6
|
|
del x, y
|
|
L = 8
|
|
L = 9
|
|
L = 10
|
|
""")
|
|
ns = {}
|
|
exec(code, ns)
|
|
f = ns['f']
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
co_code = f.__code__.co_code
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 9:
|
|
frame.f_lineno = 3
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
e = r"assigning None to 2 unbound locals"
|
|
with self.assertWarnsRegex(RuntimeWarning, e):
|
|
sys.settrace(trace)
|
|
result = f()
|
|
self.assertEqual(result, 4)
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
self.assertEqual(f.__code__.co_code, co_code)
|
|
|
|
def make_function_with_no_checks(self):
|
|
code = textwrap.dedent("""\
|
|
def f():
|
|
x = 2
|
|
L = 3
|
|
L = 4
|
|
L = 5
|
|
if not L:
|
|
x + 7
|
|
y = 2
|
|
""")
|
|
ns = {}
|
|
exec(code, ns)
|
|
f = ns['f']
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
return f
|
|
|
|
def test_deleting_local_warns_and_assigns_none(self):
|
|
f = self.make_function_with_no_checks()
|
|
co_code = f.__code__.co_code
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 4:
|
|
del frame.f_locals["x"]
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
e = r"assigning None to unbound local 'x'"
|
|
with self.assertWarnsRegex(RuntimeWarning, e):
|
|
sys.settrace(trace)
|
|
f()
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
self.assertEqual(f.__code__.co_code, co_code)
|
|
|
|
def test_modifying_local_does_not_add_check(self):
|
|
f = self.make_function_with_no_checks()
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 4:
|
|
frame.f_locals["x"] = 42
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
sys.settrace(trace)
|
|
f()
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
|
|
def test_initializing_local_does_not_add_check(self):
|
|
f = self.make_function_with_no_checks()
|
|
def trace(frame, event, arg):
|
|
if event == 'line' and frame.f_lineno == 4:
|
|
frame.f_locals["y"] = 42
|
|
sys.settrace(None)
|
|
return None
|
|
return trace
|
|
sys.settrace(trace)
|
|
f()
|
|
self.assertInBytecode(f, "LOAD_FAST")
|
|
self.assertNotInBytecode(f, "LOAD_FAST_CHECK")
|
|
|
|
|
|
class DirectCfgOptimizerTests(CfgOptimizationTestCase):
|
|
|
|
def cfg_optimization_test(self, insts, expected_insts,
|
|
consts=None, expected_consts=None,
|
|
nlocals=0):
|
|
if expected_consts is None:
|
|
expected_consts = consts
|
|
opt_insts, opt_consts = self.get_optimized(insts, consts, nlocals)
|
|
expected_insts = self.normalize_insts(expected_insts)
|
|
self.assertInstructionsMatch(opt_insts, expected_insts)
|
|
self.assertEqual(opt_consts, expected_consts)
|
|
|
|
def test_conditional_jump_forward_non_const_condition(self):
|
|
insts = [
|
|
('LOAD_NAME', 1, 11),
|
|
('POP_JUMP_IF_TRUE', lbl := self.Label(), 12),
|
|
('LOAD_CONST', 2, 13),
|
|
('RETURN_VALUE', 13),
|
|
lbl,
|
|
('LOAD_CONST', 3, 14),
|
|
('RETURN_VALUE', 14),
|
|
]
|
|
expected_insts = [
|
|
('LOAD_NAME', 1, 11),
|
|
('POP_JUMP_IF_TRUE', lbl := self.Label(), 12),
|
|
('RETURN_CONST', 1, 13),
|
|
lbl,
|
|
('RETURN_CONST', 2, 14),
|
|
]
|
|
self.cfg_optimization_test(insts,
|
|
expected_insts,
|
|
consts=[0, 1, 2, 3, 4],
|
|
expected_consts=[0, 2, 3])
|
|
|
|
def test_conditional_jump_forward_const_condition(self):
|
|
# The unreachable branch of the jump is removed, the jump
|
|
# becomes redundant and is replaced by a NOP (for the lineno)
|
|
|
|
insts = [
|
|
('LOAD_CONST', 3, 11),
|
|
('POP_JUMP_IF_TRUE', lbl := self.Label(), 12),
|
|
('LOAD_CONST', 2, 13),
|
|
lbl,
|
|
('LOAD_CONST', 3, 14),
|
|
('RETURN_VALUE', 14),
|
|
]
|
|
expected_insts = [
|
|
('NOP', 11),
|
|
('NOP', 12),
|
|
('RETURN_CONST', 1, 14),
|
|
]
|
|
self.cfg_optimization_test(insts,
|
|
expected_insts,
|
|
consts=[0, 1, 2, 3, 4],
|
|
expected_consts=[0, 3])
|
|
|
|
def test_conditional_jump_backward_non_const_condition(self):
|
|
insts = [
|
|
lbl1 := self.Label(),
|
|
('LOAD_NAME', 1, 11),
|
|
('POP_JUMP_IF_TRUE', lbl1, 12),
|
|
('LOAD_NAME', 2, 13),
|
|
('RETURN_VALUE', 13),
|
|
]
|
|
expected = [
|
|
lbl := self.Label(),
|
|
('LOAD_NAME', 1, 11),
|
|
('POP_JUMP_IF_TRUE', lbl, 12),
|
|
('LOAD_NAME', 2, 13),
|
|
('RETURN_VALUE', 13),
|
|
]
|
|
self.cfg_optimization_test(insts, expected, consts=list(range(5)))
|
|
|
|
def test_conditional_jump_backward_const_condition(self):
|
|
# The unreachable branch of the jump is removed
|
|
insts = [
|
|
lbl1 := self.Label(),
|
|
('LOAD_CONST', 3, 11),
|
|
('POP_JUMP_IF_TRUE', lbl1, 12),
|
|
('LOAD_CONST', 2, 13),
|
|
('RETURN_VALUE', 13),
|
|
]
|
|
expected_insts = [
|
|
lbl := self.Label(),
|
|
('NOP', 11),
|
|
('JUMP', lbl, 12),
|
|
]
|
|
self.cfg_optimization_test(insts, expected_insts, consts=list(range(5)))
|
|
|
|
def test_no_unsafe_static_swap(self):
|
|
# We can't change order of two stores to the same location
|
|
insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('LOAD_CONST', 2, 3),
|
|
('SWAP', 3, 4),
|
|
('STORE_FAST', 1, 4),
|
|
('STORE_FAST', 1, 4),
|
|
('POP_TOP', 0, 4),
|
|
('LOAD_CONST', 0, 5),
|
|
('RETURN_VALUE', 5)
|
|
]
|
|
expected_insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('NOP', 0, 3),
|
|
('STORE_FAST', 1, 4),
|
|
('POP_TOP', 0, 4),
|
|
('RETURN_CONST', 0)
|
|
]
|
|
self.cfg_optimization_test(insts, expected_insts, consts=list(range(3)), nlocals=1)
|
|
|
|
def test_dead_store_elimination_in_same_lineno(self):
|
|
insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('LOAD_CONST', 2, 3),
|
|
('STORE_FAST', 1, 4),
|
|
('STORE_FAST', 1, 4),
|
|
('STORE_FAST', 1, 4),
|
|
('LOAD_CONST', 0, 5),
|
|
('RETURN_VALUE', 5)
|
|
]
|
|
expected_insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('NOP', 0, 3),
|
|
('POP_TOP', 0, 4),
|
|
('STORE_FAST', 1, 4),
|
|
('RETURN_CONST', 0, 5)
|
|
]
|
|
self.cfg_optimization_test(insts, expected_insts, consts=list(range(3)), nlocals=1)
|
|
|
|
def test_no_dead_store_elimination_in_different_lineno(self):
|
|
insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('LOAD_CONST', 2, 3),
|
|
('STORE_FAST', 1, 4),
|
|
('STORE_FAST', 1, 5),
|
|
('STORE_FAST', 1, 6),
|
|
('LOAD_CONST', 0, 5),
|
|
('RETURN_VALUE', 5)
|
|
]
|
|
expected_insts = [
|
|
('LOAD_CONST', 0, 1),
|
|
('LOAD_CONST', 1, 2),
|
|
('LOAD_CONST', 2, 3),
|
|
('STORE_FAST', 1, 4),
|
|
('STORE_FAST', 1, 5),
|
|
('STORE_FAST', 1, 6),
|
|
('RETURN_CONST', 0, 5)
|
|
]
|
|
self.cfg_optimization_test(insts, expected_insts, consts=list(range(3)), nlocals=1)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|