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2884 lines (2533 loc) · 100 KB
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import contextlib
import dis
import io
import itertools
import math
import opcode
import os
import unittest
import sys
import ast
import _ast
import tempfile
import types
import textwrap
import warnings
try:
import _testinternalcapi
except ImportError:
_testinternalcapi = None
from test import support
from test.support import (script_helper, requires_debug_ranges, run_code,
requires_specialization)
from test.support.bytecode_helper import instructions_with_positions
from test.support.os_helper import FakePath
class TestSpecifics(unittest.TestCase):
def compile_single(self, source):
compile(source, "<single>", "single")
def assertInvalidSingle(self, source):
self.assertRaises(SyntaxError, self.compile_single, source)
def test_no_ending_newline(self):
compile("hi", "<test>", "exec")
compile("hi\r", "<test>", "exec")
def test_empty(self):
compile("", "<test>", "exec")
def test_other_newlines(self):
compile("\r\n", "<test>", "exec")
compile("\r", "<test>", "exec")
compile("hi\r\nstuff\r\ndef f():\n pass\r", "<test>", "exec")
compile("this_is\rreally_old_mac\rdef f():\n pass", "<test>", "exec")
def test_debug_assignment(self):
# catch assignments to __debug__
self.assertRaises(SyntaxError, compile, '__debug__ = 1', '?', 'single')
import builtins
prev = builtins.__debug__
setattr(builtins, '__debug__', 'sure')
self.assertEqual(__debug__, prev)
setattr(builtins, '__debug__', prev)
def test_argument_handling(self):
# detect duplicate positional and keyword arguments
self.assertRaises(SyntaxError, eval, 'lambda a,a:0')
self.assertRaises(SyntaxError, eval, 'lambda a,a=1:0')
self.assertRaises(SyntaxError, eval, 'lambda a=1,a=1:0')
self.assertRaises(SyntaxError, exec, 'def f(a, a): pass')
self.assertRaises(SyntaxError, exec, 'def f(a = 0, a = 1): pass')
self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')
def test_syntax_error(self):
self.assertRaises(SyntaxError, compile, "1+*3", "filename", "exec")
def test_none_keyword_arg(self):
self.assertRaises(SyntaxError, compile, "f(None=1)", "<string>", "exec")
def test_duplicate_global_local(self):
self.assertRaises(SyntaxError, exec, 'def f(a): global a; a = 1')
def test_exec_with_general_mapping_for_locals(self):
class M:
"Test mapping interface versus possible calls from eval()."
def __getitem__(self, key):
if key == 'a':
return 12
raise KeyError
def __setitem__(self, key, value):
self.results = (key, value)
def keys(self):
return list('xyz')
m = M()
g = globals()
exec('z = a', g, m)
self.assertEqual(m.results, ('z', 12))
try:
exec('z = b', g, m)
except NameError:
pass
else:
self.fail('Did not detect a KeyError')
exec('z = dir()', g, m)
self.assertEqual(m.results, ('z', list('xyz')))
exec('z = globals()', g, m)
self.assertEqual(m.results, ('z', g))
exec('z = locals()', g, m)
self.assertEqual(m.results, ('z', m))
self.assertRaises(TypeError, exec, 'z = b', m)
class A:
"Non-mapping"
pass
m = A()
self.assertRaises(TypeError, exec, 'z = a', g, m)
# Verify that dict subclasses work as well
class D(dict):
def __getitem__(self, key):
if key == 'a':
return 12
return dict.__getitem__(self, key)
d = D()
exec('z = a', g, d)
self.assertEqual(d['z'], 12)
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
@support.skip_emscripten_stack_overflow()
def test_extended_arg(self):
repeat = 100
longexpr = 'x = x or ' + '-x' * repeat
g = {}
code = textwrap.dedent('''
def f(x):
%s
%s
%s
%s
%s
%s
%s
%s
%s
%s
# the expressions above have no effect, x == argument
while x:
x -= 1
# EXTENDED_ARG/JUMP_ABSOLUTE here
return x
''' % ((longexpr,)*10))
exec(code, g)
self.assertEqual(g['f'](5), 0)
def test_argument_order(self):
self.assertRaises(SyntaxError, exec, 'def f(a=1, b): pass')
def test_float_literals(self):
# testing bad float literals
self.assertRaises(SyntaxError, eval, "2e")
self.assertRaises(SyntaxError, eval, "2.0e+")
self.assertRaises(SyntaxError, eval, "1e-")
self.assertRaises(SyntaxError, eval, "3-4e/21")
def test_indentation(self):
# testing compile() of indented block w/o trailing newline"
s = textwrap.dedent("""
if 1:
if 2:
pass
""")
compile(s, "<string>", "exec")
# This test is probably specific to CPython and may not generalize
# to other implementations. We are trying to ensure that when
# the first line of code starts after 256, correct line numbers
# in tracebacks are still produced.
def test_leading_newlines(self):
s256 = "".join(["\n"] * 256 + ["spam"])
co = compile(s256, 'fn', 'exec')
self.assertEqual(co.co_firstlineno, 1)
lines = [line for _, _, line in co.co_lines()]
self.assertEqual(lines, [0, 257])
def test_literals_with_leading_zeroes(self):
for arg in ["077787", "0xj", "0x.", "0e", "090000000000000",
"080000000000000", "000000000000009", "000000000000008",
"0b42", "0BADCAFE", "0o123456789", "0b1.1", "0o4.2",
"0b101j", "0o153j", "0b100e1", "0o777e1", "0777",
"000777", "000000000000007"]:
self.assertRaises(SyntaxError, eval, arg)
self.assertEqual(eval("0xff"), 255)
self.assertEqual(eval("0777."), 777)
self.assertEqual(eval("0777.0"), 777)
self.assertEqual(eval("000000000000000000000000000000000000000000000000000777e0"), 777)
self.assertEqual(eval("0777e1"), 7770)
self.assertEqual(eval("0e0"), 0)
self.assertEqual(eval("0000e-012"), 0)
self.assertEqual(eval("09.5"), 9.5)
self.assertEqual(eval("0777j"), 777j)
self.assertEqual(eval("000"), 0)
self.assertEqual(eval("00j"), 0j)
self.assertEqual(eval("00.0"), 0)
self.assertEqual(eval("0e3"), 0)
self.assertEqual(eval("090000000000000."), 90000000000000.)
self.assertEqual(eval("090000000000000.0000000000000000000000"), 90000000000000.)
self.assertEqual(eval("090000000000000e0"), 90000000000000.)
self.assertEqual(eval("090000000000000e-0"), 90000000000000.)
self.assertEqual(eval("090000000000000j"), 90000000000000j)
self.assertEqual(eval("000000000000008."), 8.)
self.assertEqual(eval("000000000000009."), 9.)
self.assertEqual(eval("0b101010"), 42)
self.assertEqual(eval("-0b000000000010"), -2)
self.assertEqual(eval("0o777"), 511)
self.assertEqual(eval("-0o0000010"), -8)
def test_int_literals_too_long(self):
n = 3000
source = f"a = 1\nb = 2\nc = {'3'*n}\nd = 4"
with support.adjust_int_max_str_digits(n):
compile(source, "<long_int_pass>", "exec") # no errors.
with support.adjust_int_max_str_digits(n-1):
with self.assertRaises(SyntaxError) as err_ctx:
compile(source, "<long_int_fail>", "exec")
exc = err_ctx.exception
self.assertEqual(exc.lineno, 3)
self.assertIn('Exceeds the limit ', str(exc))
self.assertIn(' Consider hexadecimal ', str(exc))
def test_unary_minus(self):
# Verify treatment of unary minus on negative numbers SF bug #660455
if sys.maxsize == 2147483647:
# 32-bit machine
all_one_bits = '0xffffffff'
self.assertEqual(eval(all_one_bits), 4294967295)
self.assertEqual(eval("-" + all_one_bits), -4294967295)
elif sys.maxsize == 9223372036854775807:
# 64-bit machine
all_one_bits = '0xffffffffffffffff'
self.assertEqual(eval(all_one_bits), 18446744073709551615)
self.assertEqual(eval("-" + all_one_bits), -18446744073709551615)
else:
self.fail("How many bits *does* this machine have???")
# Verify treatment of constant folding on -(sys.maxsize+1)
# i.e. -2147483648 on 32 bit platforms. Should return int.
self.assertIsInstance(eval("%s" % (-sys.maxsize - 1)), int)
self.assertIsInstance(eval("%s" % (-sys.maxsize - 2)), int)
if sys.maxsize == 9223372036854775807:
def test_32_63_bit_values(self):
a = +4294967296 # 1 << 32
b = -4294967296 # 1 << 32
c = +281474976710656 # 1 << 48
d = -281474976710656 # 1 << 48
e = +4611686018427387904 # 1 << 62
f = -4611686018427387904 # 1 << 62
g = +9223372036854775807 # 1 << 63 - 1
h = -9223372036854775807 # 1 << 63 - 1
for variable in self.test_32_63_bit_values.__code__.co_consts:
if variable is not None:
self.assertIsInstance(variable, int)
def test_sequence_unpacking_error(self):
# Verify sequence packing/unpacking with "or". SF bug #757818
i,j = (1, -1) or (-1, 1)
self.assertEqual(i, 1)
self.assertEqual(j, -1)
def test_none_assignment(self):
stmts = [
'None = 0',
'None += 0',
'__builtins__.None = 0',
'def None(): pass',
'class None: pass',
'(a, None) = 0, 0',
'for None in range(10): pass',
'def f(None): pass',
'import None',
'import x as None',
'from x import None',
'from x import y as None'
]
for stmt in stmts:
stmt += "\n"
self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'single')
self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')
def test_import(self):
succeed = [
'import sys',
'import os, sys',
'import os as bar',
'import os.path as bar',
'from __future__ import nested_scopes, generators',
'from __future__ import (nested_scopes,\ngenerators)',
'from __future__ import (nested_scopes,\ngenerators,)',
'from sys import stdin, stderr, stdout',
'from sys import (stdin, stderr,\nstdout)',
'from sys import (stdin, stderr,\nstdout,)',
'from sys import (stdin\n, stderr, stdout)',
'from sys import (stdin\n, stderr, stdout,)',
'from sys import stdin as si, stdout as so, stderr as se',
'from sys import (stdin as si, stdout as so, stderr as se)',
'from sys import (stdin as si, stdout as so, stderr as se,)',
]
fail = [
'import (os, sys)',
'import (os), (sys)',
'import ((os), (sys))',
'import (sys',
'import sys)',
'import (os,)',
'import os As bar',
'import os.path a bar',
'from sys import stdin As stdout',
'from sys import stdin a stdout',
'from (sys) import stdin',
'from __future__ import (nested_scopes',
'from __future__ import nested_scopes)',
'from __future__ import nested_scopes,\ngenerators',
'from sys import (stdin',
'from sys import stdin)',
'from sys import stdin, stdout,\nstderr',
'from sys import stdin si',
'from sys import stdin,',
'from sys import (*)',
'from sys import (stdin,, stdout, stderr)',
'from sys import (stdin, stdout),',
]
for stmt in succeed:
compile(stmt, 'tmp', 'exec')
for stmt in fail:
self.assertRaises(SyntaxError, compile, stmt, 'tmp', 'exec')
def test_for_distinct_code_objects(self):
# SF bug 1048870
def f():
f1 = lambda x=1: x
f2 = lambda x=2: x
return f1, f2
f1, f2 = f()
self.assertNotEqual(id(f1.__code__), id(f2.__code__))
def test_lambda_doc(self):
l = lambda: "foo"
self.assertIsNone(l.__doc__)
def test_lambda_consts(self):
l = lambda: "this is the only const"
self.assertEqual(l.__code__.co_consts, ("this is the only const",))
def test_encoding(self):
code = b'# -*- coding: badencoding -*-\npass\n'
self.assertRaises(SyntaxError, compile, code, 'tmp', 'exec')
code = '# -*- coding: badencoding -*-\n"\xc2\xa4"\n'
compile(code, 'tmp', 'exec')
self.assertEqual(eval(code), '\xc2\xa4')
code = '"\xc2\xa4"\n'
self.assertEqual(eval(code), '\xc2\xa4')
code = b'"\xc2\xa4"\n'
self.assertEqual(eval(code), '\xa4')
code = b'# -*- coding: latin1 -*-\n"\xc2\xa4"\n'
self.assertEqual(eval(code), '\xc2\xa4')
code = b'# -*- coding: utf-8 -*-\n"\xc2\xa4"\n'
self.assertEqual(eval(code), '\xa4')
code = b'# -*- coding: iso8859-15 -*-\n"\xc2\xa4"\n'
self.assertEqual(eval(code), '\xc2\u20ac')
code = '"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xc2\xa4')
code = b'"""\\\n# -*- coding: iso8859-15 -*-\n\xc2\xa4"""\n'
self.assertEqual(eval(code), '# -*- coding: iso8859-15 -*-\n\xa4')
def test_subscripts(self):
# SF bug 1448804
# Class to make testing subscript results easy
class str_map(object):
def __init__(self):
self.data = {}
def __getitem__(self, key):
return self.data[str(key)]
def __setitem__(self, key, value):
self.data[str(key)] = value
def __delitem__(self, key):
del self.data[str(key)]
def __contains__(self, key):
return str(key) in self.data
d = str_map()
# Index
d[1] = 1
self.assertEqual(d[1], 1)
d[1] += 1
self.assertEqual(d[1], 2)
del d[1]
self.assertNotIn(1, d)
# Tuple of indices
d[1, 1] = 1
self.assertEqual(d[1, 1], 1)
d[1, 1] += 1
self.assertEqual(d[1, 1], 2)
del d[1, 1]
self.assertNotIn((1, 1), d)
# Simple slice
d[1:2] = 1
self.assertEqual(d[1:2], 1)
d[1:2] += 1
self.assertEqual(d[1:2], 2)
del d[1:2]
self.assertNotIn(slice(1, 2), d)
# Tuple of simple slices
d[1:2, 1:2] = 1
self.assertEqual(d[1:2, 1:2], 1)
d[1:2, 1:2] += 1
self.assertEqual(d[1:2, 1:2], 2)
del d[1:2, 1:2]
self.assertNotIn((slice(1, 2), slice(1, 2)), d)
# Extended slice
d[1:2:3] = 1
self.assertEqual(d[1:2:3], 1)
d[1:2:3] += 1
self.assertEqual(d[1:2:3], 2)
del d[1:2:3]
self.assertNotIn(slice(1, 2, 3), d)
# Tuple of extended slices
d[1:2:3, 1:2:3] = 1
self.assertEqual(d[1:2:3, 1:2:3], 1)
d[1:2:3, 1:2:3] += 1
self.assertEqual(d[1:2:3, 1:2:3], 2)
del d[1:2:3, 1:2:3]
self.assertNotIn((slice(1, 2, 3), slice(1, 2, 3)), d)
# Ellipsis
d[...] = 1
self.assertEqual(d[...], 1)
d[...] += 1
self.assertEqual(d[...], 2)
del d[...]
self.assertNotIn(Ellipsis, d)
# Tuple of Ellipses
d[..., ...] = 1
self.assertEqual(d[..., ...], 1)
d[..., ...] += 1
self.assertEqual(d[..., ...], 2)
del d[..., ...]
self.assertNotIn((Ellipsis, Ellipsis), d)
def test_annotation_limit(self):
# more than 255 annotations, should compile ok
s = "def f(%s): pass"
s %= ', '.join('a%d:%d' % (i,i) for i in range(300))
compile(s, '?', 'exec')
def test_mangling(self):
class A:
def f():
__mangled = 1
__not_mangled__ = 2
import __mangled_mod # noqa: F401
import __package__.module # noqa: F401
self.assertIn("_A__mangled", A.f.__code__.co_varnames)
self.assertIn("__not_mangled__", A.f.__code__.co_varnames)
self.assertIn("_A__mangled_mod", A.f.__code__.co_varnames)
self.assertIn("__package__", A.f.__code__.co_varnames)
def test_condition_expression_with_dead_blocks_compiles(self):
# See gh-113054
compile('if (5 if 5 else T): 0', '<eval>', 'exec')
def test_condition_expression_with_redundant_comparisons_compiles(self):
# See gh-113054, gh-114083
exprs = [
'if 9<9<9and 9or 9:9',
'if 9<9<9and 9or 9or 9:9',
'if 9<9<9and 9or 9or 9or 9:9',
'if 9<9<9and 9or 9or 9or 9or 9:9',
]
for expr in exprs:
with self.subTest(expr=expr):
with self.assertWarns(SyntaxWarning):
compile(expr, '<eval>', 'exec')
def test_dead_code_with_except_handler_compiles(self):
compile(textwrap.dedent("""
if None:
with CM:
x = 1
else:
x = 2
"""), '<eval>', 'exec')
def test_try_except_in_while_with_chained_condition_compiles(self):
# see gh-124871
compile(textwrap.dedent("""
name_1, name_2, name_3 = 1, 2, 3
while name_3 <= name_2 > name_1:
try:
raise
except:
pass
finally:
pass
"""), '<eval>', 'exec')
def test_compile_invalid_namedexpr(self):
# gh-109351
m = ast.Module(
body=[
ast.Expr(
value=ast.ListComp(
elt=ast.NamedExpr(
target=ast.Constant(value=1),
value=ast.Constant(value=3),
),
generators=[
ast.comprehension(
target=ast.Name(id="x", ctx=ast.Store()),
iter=ast.Name(id="y", ctx=ast.Load()),
ifs=[],
is_async=0,
)
],
)
)
],
type_ignores=[],
)
with self.assertRaisesRegex(TypeError, "NamedExpr target must be a Name"):
compile(ast.fix_missing_locations(m), "<file>", "exec")
def test_compile_redundant_jumps_and_nops_after_moving_cold_blocks(self):
# See gh-120367
code=textwrap.dedent("""
try:
pass
except:
pass
else:
match name_2:
case b'':
pass
finally:
something
""")
tree = ast.parse(code)
# make all instruction locations the same to create redundancies
for node in ast.walk(tree):
if hasattr(node,"lineno"):
del node.lineno
del node.end_lineno
del node.col_offset
del node.end_col_offset
compile(ast.fix_missing_locations(tree), "<file>", "exec")
def test_compile_redundant_jump_after_convert_pseudo_ops(self):
# See gh-120367
code=textwrap.dedent("""
if name_2:
pass
else:
try:
pass
except:
pass
~name_5
""")
tree = ast.parse(code)
# make all instruction locations the same to create redundancies
for node in ast.walk(tree):
if hasattr(node,"lineno"):
del node.lineno
del node.end_lineno
del node.col_offset
del node.end_col_offset
compile(ast.fix_missing_locations(tree), "<file>", "exec")
def test_compile_ast(self):
fname = __file__
if fname.lower().endswith('pyc'):
fname = fname[:-1]
with open(fname, encoding='utf-8') as f:
fcontents = f.read()
sample_code = [
['<assign>', 'x = 5'],
['<ifblock>', """if True:\n pass\n"""],
['<forblock>', """for n in [1, 2, 3]:\n print(n)\n"""],
['<deffunc>', """def foo():\n pass\nfoo()\n"""],
[fname, fcontents],
]
for fname, code in sample_code:
co1 = compile(code, '%s1' % fname, 'exec')
ast = compile(code, '%s2' % fname, 'exec', _ast.PyCF_ONLY_AST)
self.assertTrue(type(ast) == _ast.Module)
co2 = compile(ast, '%s3' % fname, 'exec')
self.assertEqual(co1, co2)
# the code object's filename comes from the second compilation step
self.assertEqual(co2.co_filename, '%s3' % fname)
# raise exception when node type doesn't match with compile mode
co1 = compile('print(1)', '<string>', 'exec', _ast.PyCF_ONLY_AST)
self.assertRaises(TypeError, compile, co1, '<ast>', 'eval')
# raise exception when node type is no start node
self.assertRaises(TypeError, compile, _ast.If(test=_ast.Name(id='x', ctx=_ast.Load())), '<ast>', 'exec')
# raise exception when node has invalid children
ast = _ast.Module()
ast.body = [_ast.BoolOp(op=_ast.Or())]
self.assertRaises(TypeError, compile, ast, '<ast>', 'exec')
def test_compile_invalid_typealias(self):
# gh-109341
m = ast.Module(
body=[
ast.TypeAlias(
name=ast.Subscript(
value=ast.Name(id="foo", ctx=ast.Load()),
slice=ast.Constant(value="x"),
ctx=ast.Store(),
),
type_params=[],
value=ast.Name(id="Callable", ctx=ast.Load()),
)
],
type_ignores=[],
)
with self.assertRaisesRegex(TypeError, "TypeAlias with non-Name name"):
compile(ast.fix_missing_locations(m), "<file>", "exec")
def test_dict_evaluation_order(self):
i = 0
def f():
nonlocal i
i += 1
return i
d = {f(): f(), f(): f()}
self.assertEqual(d, {1: 2, 3: 4})
def test_compile_filename(self):
for filename in 'file.py', b'file.py':
code = compile('pass', filename, 'exec')
self.assertEqual(code.co_filename, 'file.py')
for filename in bytearray(b'file.py'), memoryview(b'file.py'):
with self.assertRaises(TypeError):
compile('pass', filename, 'exec')
self.assertRaises(TypeError, compile, 'pass', list(b'file.py'), 'exec')
@support.cpython_only
def test_same_filename_used(self):
s = """def f(): pass\ndef g(): pass"""
c = compile(s, "myfile", "exec")
for obj in c.co_consts:
if isinstance(obj, types.CodeType):
self.assertIs(obj.co_filename, c.co_filename)
def test_single_statement(self):
self.compile_single("1 + 2")
self.compile_single("\n1 + 2")
self.compile_single("1 + 2\n")
self.compile_single("1 + 2\n\n")
self.compile_single("1 + 2\t\t\n")
self.compile_single("1 + 2\t\t\n ")
self.compile_single("1 + 2 # one plus two")
self.compile_single("1; 2")
self.compile_single("import sys; sys")
self.compile_single("def f():\n pass")
self.compile_single("while False:\n pass")
self.compile_single("if x:\n f(x)")
self.compile_single("if x:\n f(x)\nelse:\n g(x)")
self.compile_single("class T:\n pass")
self.compile_single("c = '''\na=1\nb=2\nc=3\n'''")
def test_bad_single_statement(self):
self.assertInvalidSingle('1\n2')
self.assertInvalidSingle('def f(): pass')
self.assertInvalidSingle('a = 13\nb = 187')
self.assertInvalidSingle('del x\ndel y')
self.assertInvalidSingle('f()\ng()')
self.assertInvalidSingle('f()\n# blah\nblah()')
self.assertInvalidSingle('f()\nxy # blah\nblah()')
self.assertInvalidSingle('x = 5 # comment\nx = 6\n')
self.assertInvalidSingle("c = '''\nd=1\n'''\na = 1\n\nb = 2\n")
def test_particularly_evil_undecodable(self):
# Issue 24022
src = b'0000\x00\n00000000000\n\x00\n\x9e\n'
with tempfile.TemporaryDirectory() as tmpd:
fn = os.path.join(tmpd, "bad.py")
with open(fn, "wb") as fp:
fp.write(src)
res = script_helper.run_python_until_end(fn)[0]
self.assertIn(b"source code cannot contain null bytes", res.err)
def test_yet_more_evil_still_undecodable(self):
# Issue #25388
src = b"#\x00\n#\xfd\n"
with tempfile.TemporaryDirectory() as tmpd:
fn = os.path.join(tmpd, "bad.py")
with open(fn, "wb") as fp:
fp.write(src)
res = script_helper.run_python_until_end(fn)[0]
self.assertIn(b"source code cannot contain null bytes", res.err)
@support.cpython_only
@unittest.skipIf(support.is_wasi, "exhausts limited stack on WASI")
@support.skip_emscripten_stack_overflow()
def test_compiler_recursion_limit(self):
# Compiler frames are small
limit = 100
crash_depth = limit * 5000
success_depth = limit
def check_limit(prefix, repeated, mode="single"):
expect_ok = prefix + repeated * success_depth
compile(expect_ok, '<test>', mode)
broken = prefix + repeated * crash_depth
details = f"Compiling ({prefix!r} + {repeated!r} * {crash_depth})"
with self.assertRaises(RecursionError, msg=details):
compile(broken, '<test>', mode)
check_limit("a", "()")
check_limit("a", ".b")
check_limit("a", "[0]")
check_limit("a", "*a")
# XXX Crashes in the parser.
# check_limit("a", " if a else a")
# check_limit("if a: pass", "\nelif a: pass", mode="exec")
def test_null_terminated(self):
# The source code is null-terminated internally, but bytes-like
# objects are accepted, which could be not terminated.
with self.assertRaisesRegex(SyntaxError, "cannot contain null"):
compile("123\x00", "<dummy>", "eval")
with self.assertRaisesRegex(SyntaxError, "cannot contain null"):
compile(memoryview(b"123\x00"), "<dummy>", "eval")
code = compile(memoryview(b"123\x00")[1:-1], "<dummy>", "eval")
self.assertEqual(eval(code), 23)
code = compile(memoryview(b"1234")[1:-1], "<dummy>", "eval")
self.assertEqual(eval(code), 23)
code = compile(memoryview(b"$23$")[1:-1], "<dummy>", "eval")
self.assertEqual(eval(code), 23)
# Also test when eval() and exec() do the compilation step
self.assertEqual(eval(memoryview(b"1234")[1:-1]), 23)
namespace = dict()
exec(memoryview(b"ax = 123")[1:-1], namespace)
self.assertEqual(namespace['x'], 12)
def check_constant(self, func, expected):
for const in func.__code__.co_consts:
if repr(const) == repr(expected):
break
else:
self.fail("unable to find constant %r in %r"
% (expected, func.__code__.co_consts))
# Merging equal constants is not a strict requirement for the Python
# semantics, it's a more an implementation detail.
@support.cpython_only
def test_merge_constants(self):
# Issue #25843: compile() must merge constants which are equal
# and have the same type.
def check_same_constant(const):
ns = {}
code = "f1, f2 = lambda: %r, lambda: %r" % (const, const)
exec(code, ns)
f1 = ns['f1']
f2 = ns['f2']
self.assertIs(f1.__code__.co_consts, f2.__code__.co_consts)
self.check_constant(f1, const)
self.assertEqual(repr(f1()), repr(const))
check_same_constant(None)
check_same_constant(0.0)
check_same_constant(b'abc')
check_same_constant('abc')
# Note: "lambda: ..." emits "LOAD_CONST Ellipsis",
# whereas "lambda: Ellipsis" emits "LOAD_GLOBAL Ellipsis"
f1, f2 = lambda: ..., lambda: ...
self.assertIs(f1.__code__.co_consts, f2.__code__.co_consts)
self.check_constant(f1, Ellipsis)
self.assertEqual(repr(f1()), repr(Ellipsis))
# Merge constants in tuple or frozenset
f1, f2 = lambda: "not a name", lambda: ("not a name",)
f3 = lambda x: x in {("not a name",)}
self.assertIs(f1.__code__.co_consts[0],
f2.__code__.co_consts[1][0])
self.assertIs(next(iter(f3.__code__.co_consts[1])),
f2.__code__.co_consts[1])
# {0} is converted to a constant frozenset({0}) by the peephole
# optimizer
f1, f2 = lambda x: x in {0}, lambda x: x in {0}
self.assertIs(f1.__code__.co_consts, f2.__code__.co_consts)
self.check_constant(f1, frozenset({0}))
self.assertTrue(f1(0))
# Merging equal co_linetable is not a strict requirement
# for the Python semantics, it's a more an implementation detail.
@support.cpython_only
def test_merge_code_attrs(self):
# See https://bugs.python.org/issue42217
f1 = lambda x: x.y.z
f2 = lambda a: a.b.c
self.assertIs(f1.__code__.co_linetable, f2.__code__.co_linetable)
@support.cpython_only
def test_remove_unused_consts(self):
def f():
"docstring"
if True:
return "used"
else:
return "unused"
self.assertEqual(f.__code__.co_consts,
(f.__doc__, "used"))
@support.cpython_only
def test_remove_unused_consts_no_docstring(self):
# the first item (None for no docstring in this case) is
# always retained.
def f():
if True:
return "used"
else:
return "unused"
self.assertEqual(f.__code__.co_consts,
(True, "used"))
@support.cpython_only
def test_remove_unused_consts_extended_args(self):
N = 1000
code = ["def f():\n"]
code.append("\ts = ''\n")
code.append("\tfor i in range(1):\n")
for i in range(N):
code.append(f"\t\tif True: s += 't{i}'\n")
code.append(f"\t\tif False: s += 'f{i}'\n")
code.append("\treturn s\n")
code = "".join(code)
g = {}
eval(compile(code, "file.py", "exec"), g)
exec(code, g)
f = g['f']
expected = tuple([''] + [f't{i}' for i in range(N)])
self.assertEqual(f.__code__.co_consts, expected)
expected = "".join(expected[1:])
self.assertEqual(expected, f())
# Stripping unused constants is not a strict requirement for the
# Python semantics, it's a more an implementation detail.
@support.cpython_only
def test_strip_unused_None(self):
# Python 3.10rc1 appended None to co_consts when None is not used
# at all. See bpo-45056.
def f1():
"docstring"
return 42
self.assertEqual(f1.__code__.co_consts, (f1.__doc__,))
# This is a regression test for a CPython specific peephole optimizer
# implementation bug present in a few releases. It's assertion verifies
# that peephole optimization was actually done though that isn't an
# indication of the bugs presence or not (crashing is).
@support.cpython_only
def test_peephole_opt_unreachable_code_array_access_in_bounds(self):
"""Regression test for issue35193 when run under clang msan."""
def unused_code_at_end():
return 3
raise RuntimeError("unreachable")
# The above function definition will trigger the out of bounds
# bug in the peephole optimizer as it scans opcodes past the
# RETURN_VALUE opcode. This does not always crash an interpreter.
# When you build with the clang memory sanitizer it reliably aborts.
self.assertEqual(
'RETURN_VALUE',
list(dis.get_instructions(unused_code_at_end))[-1].opname)
@support.cpython_only
def test_docstring(self):
src = textwrap.dedent("""
def with_docstring():
"docstring"
def two_strings():
"docstring"
"not docstring"
def with_fstring():
f"not docstring"
def with_const_expression():
"also" + " not docstring"
def multiple_const_strings():
"not docstring " * 3
""")
for opt in [0, 1, 2]:
with self.subTest(opt=opt):
code = compile(src, "<test>", "exec", optimize=opt)
ns = {}
exec(code, ns)
if opt < 2:
self.assertEqual(ns['with_docstring'].__doc__, "docstring")
self.assertEqual(ns['two_strings'].__doc__, "docstring")
else:
self.assertIsNone(ns['with_docstring'].__doc__)
self.assertIsNone(ns['two_strings'].__doc__)
self.assertIsNone(ns['with_fstring'].__doc__)
self.assertIsNone(ns['with_const_expression'].__doc__)
self.assertIsNone(ns['multiple_const_strings'].__doc__)
@support.cpython_only
def test_docstring_interactive_mode(self):
srcs = [
"""def with_docstring():
"docstring"
""",
"""class with_docstring:
"docstring"
""",
]
for opt in [0, 1, 2]:
for src in srcs:
with self.subTest(opt=opt, src=src):
code = compile(textwrap.dedent(src), "<test>", "single", optimize=opt)
ns = {}
exec(code, ns)
if opt < 2:
self.assertEqual(ns['with_docstring'].__doc__, "docstring")
else:
self.assertIsNone(ns['with_docstring'].__doc__)
@support.cpython_only
def test_docstring_omitted(self):
# See gh-115347
src = textwrap.dedent("""
def f():
"docstring1"
def h():
"docstring2"
return 42
class C:
"docstring3"
pass
return h
""")
for opt in [-1, 0, 1, 2]:
for mode in ["exec", "single"]:
with self.subTest(opt=opt, mode=mode):
code = compile(src, "<test>", mode, optimize=opt)
output = io.StringIO()
with contextlib.redirect_stdout(output):
dis.dis(code)
self.assertNotIn('NOP', output.getvalue())
def test_dont_merge_constants(self):
# Issue #25843: compile() must not merge constants which are equal
# but have a different type.
def check_different_constants(const1, const2):
ns = {}
exec("f1, f2 = lambda: %r, lambda: %r" % (const1, const2), ns)
f1 = ns['f1']
f2 = ns['f2']
self.assertIsNot(f1.__code__, f2.__code__)
self.assertNotEqual(f1.__code__, f2.__code__)
self.check_constant(f1, const1)
self.check_constant(f2, const2)
self.assertEqual(repr(f1()), repr(const1))
self.assertEqual(repr(f2()), repr(const2))
check_different_constants(+0.0, -0.0)
check_different_constants((0,), (0.0,))
check_different_constants('a', b'a')
check_different_constants(('a',), (b'a',))
# check_different_constants() cannot be used because repr(-0j) is
# '(-0-0j)', but when '(-0-0j)' is evaluated to 0j: we loose the sign.
f1, f2 = lambda: +0.0j, lambda: -0.0j
self.assertIsNot(f1.__code__, f2.__code__)
self.check_constant(f1, +0.0j)