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2e95c5ba3b
Each thread specializes a thread-local copy of the bytecode, created on the first RESUME, in free-threaded builds. All copies of the bytecode for a code object are stored in the co_tlbc array on the code object. Threads reserve a globally unique index identifying its copy of the bytecode in all co_tlbc arrays at thread creation and release the index at thread destruction. The first entry in every co_tlbc array always points to the "main" copy of the bytecode that is stored at the end of the code object. This ensures that no bytecode is copied for programs that do not use threads. Thread-local bytecode can be disabled at runtime by providing either -X tlbc=0 or PYTHON_TLBC=0. Disabling thread-local bytecode also disables specialization. Concurrent modifications to the bytecode made by the specializing interpreter and instrumentation use atomics, with specialization taking care not to overwrite an instruction that was instrumented concurrently.
380 lines
15 KiB
Python
380 lines
15 KiB
Python
"""
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Tests PyConfig_Get() and PyConfig_Set() C API (PEP 741).
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"""
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import os
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import sys
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import sysconfig
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import types
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import unittest
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from test import support
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from test.support import import_helper
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_testcapi = import_helper.import_module('_testcapi')
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# Is the Py_STATS macro defined?
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Py_STATS = hasattr(sys, '_stats_on')
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class CAPITests(unittest.TestCase):
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def test_config_get(self):
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# Test PyConfig_Get()
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config_get = _testcapi.config_get
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config_names = _testcapi.config_names
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TEST_VALUE = {
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str: "TEST_MARKER_STR",
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str | None: "TEST_MARKER_OPT_STR",
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list[str]: ("TEST_MARKER_STR_TUPLE",),
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dict[str, str | bool]: {"x": "value", "y": True},
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}
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# read config options and check their type
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options = [
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("allocator", int, None),
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("argv", list[str], "argv"),
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("base_exec_prefix", str | None, "base_exec_prefix"),
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("base_executable", str | None, "_base_executable"),
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("base_prefix", str | None, "base_prefix"),
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("buffered_stdio", bool, None),
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("bytes_warning", int, None),
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("check_hash_pycs_mode", str, None),
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("code_debug_ranges", bool, None),
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("configure_c_stdio", bool, None),
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("coerce_c_locale", bool, None),
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("coerce_c_locale_warn", bool, None),
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("configure_locale", bool, None),
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("cpu_count", int, None),
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("dev_mode", bool, None),
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("dump_refs", bool, None),
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("dump_refs_file", str | None, None),
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("exec_prefix", str | None, "exec_prefix"),
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("executable", str | None, "executable"),
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("faulthandler", bool, None),
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("filesystem_encoding", str, None),
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("filesystem_errors", str, None),
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("hash_seed", int, None),
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("home", str | None, None),
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("import_time", bool, None),
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("inspect", bool, None),
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("install_signal_handlers", bool, None),
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("int_max_str_digits", int, None),
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("interactive", bool, None),
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("isolated", bool, None),
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("malloc_stats", bool, None),
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("module_search_paths", list[str], "path"),
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("optimization_level", int, None),
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("orig_argv", list[str], "orig_argv"),
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("parser_debug", bool, None),
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("parse_argv", bool, None),
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("pathconfig_warnings", bool, None),
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("perf_profiling", int, None),
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("platlibdir", str, "platlibdir"),
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("prefix", str | None, "prefix"),
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("program_name", str, None),
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("pycache_prefix", str | None, "pycache_prefix"),
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("quiet", bool, None),
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("run_command", str | None, None),
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("run_filename", str | None, None),
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("run_module", str | None, None),
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("safe_path", bool, None),
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("show_ref_count", bool, None),
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("site_import", bool, None),
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("skip_source_first_line", bool, None),
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("stdio_encoding", str, None),
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("stdio_errors", str, None),
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("stdlib_dir", str | None, "_stdlib_dir"),
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("tracemalloc", int, None),
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("use_environment", bool, None),
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("use_frozen_modules", bool, None),
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("use_hash_seed", bool, None),
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("user_site_directory", bool, None),
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("utf8_mode", bool, None),
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("verbose", int, None),
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("warn_default_encoding", bool, None),
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("warnoptions", list[str], "warnoptions"),
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("write_bytecode", bool, None),
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("xoptions", dict[str, str | bool], "_xoptions"),
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]
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if support.Py_DEBUG:
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options.append(("run_presite", str | None, None))
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if sysconfig.get_config_var('Py_GIL_DISABLED'):
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options.append(("enable_gil", int, None))
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options.append(("tlbc_enabled", int, None))
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if support.MS_WINDOWS:
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options.extend((
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("legacy_windows_stdio", bool, None),
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("legacy_windows_fs_encoding", bool, None),
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))
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if Py_STATS:
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options.extend((
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("_pystats", bool, None),
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))
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for name, option_type, sys_attr in options:
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with self.subTest(name=name, option_type=option_type,
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sys_attr=sys_attr):
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value = config_get(name)
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if isinstance(option_type, types.GenericAlias):
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self.assertIsInstance(value, option_type.__origin__)
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if option_type.__origin__ == dict:
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key_type = option_type.__args__[0]
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value_type = option_type.__args__[1]
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for item in value.items():
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self.assertIsInstance(item[0], key_type)
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self.assertIsInstance(item[1], value_type)
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else:
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item_type = option_type.__args__[0]
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for item in value:
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self.assertIsInstance(item, item_type)
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else:
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self.assertIsInstance(value, option_type)
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if sys_attr is not None:
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expected = getattr(sys, sys_attr)
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self.assertEqual(expected, value)
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override = TEST_VALUE[option_type]
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with support.swap_attr(sys, sys_attr, override):
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self.assertEqual(config_get(name), override)
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# check that the test checks all options
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self.assertEqual(sorted(name for name, option_type, sys_attr in options),
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sorted(config_names()))
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def test_config_get_sys_flags(self):
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# Test PyConfig_Get()
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config_get = _testcapi.config_get
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# compare config options with sys.flags
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for flag, name, negate in (
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("debug", "parser_debug", False),
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("inspect", "inspect", False),
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("interactive", "interactive", False),
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("optimize", "optimization_level", False),
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("dont_write_bytecode", "write_bytecode", True),
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("no_user_site", "user_site_directory", True),
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("no_site", "site_import", True),
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("ignore_environment", "use_environment", True),
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("verbose", "verbose", False),
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("bytes_warning", "bytes_warning", False),
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("quiet", "quiet", False),
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# "hash_randomization" is tested below
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("isolated", "isolated", False),
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("dev_mode", "dev_mode", False),
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("utf8_mode", "utf8_mode", False),
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("warn_default_encoding", "warn_default_encoding", False),
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("safe_path", "safe_path", False),
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("int_max_str_digits", "int_max_str_digits", False),
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# "gil" is tested below
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):
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with self.subTest(flag=flag, name=name, negate=negate):
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value = config_get(name)
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if negate:
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value = not value
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self.assertEqual(getattr(sys.flags, flag), value)
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self.assertEqual(sys.flags.hash_randomization,
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config_get('use_hash_seed') == 0
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or config_get('hash_seed') != 0)
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if sysconfig.get_config_var('Py_GIL_DISABLED'):
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value = config_get('enable_gil')
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expected = (value if value != -1 else None)
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self.assertEqual(sys.flags.gil, expected)
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def test_config_get_non_existent(self):
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# Test PyConfig_Get() on non-existent option name
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config_get = _testcapi.config_get
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nonexistent_key = 'NONEXISTENT_KEY'
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err_msg = f'unknown config option name: {nonexistent_key}'
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with self.assertRaisesRegex(ValueError, err_msg):
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config_get(nonexistent_key)
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def test_config_get_write_bytecode(self):
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# PyConfig_Get("write_bytecode") gets sys.dont_write_bytecode
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# as an integer
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config_get = _testcapi.config_get
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with support.swap_attr(sys, "dont_write_bytecode", 0):
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self.assertEqual(config_get('write_bytecode'), 1)
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with support.swap_attr(sys, "dont_write_bytecode", "yes"):
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self.assertEqual(config_get('write_bytecode'), 0)
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with support.swap_attr(sys, "dont_write_bytecode", []):
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self.assertEqual(config_get('write_bytecode'), 1)
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def test_config_getint(self):
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# Test PyConfig_GetInt()
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config_getint = _testcapi.config_getint
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# PyConfig_MEMBER_INT type
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self.assertEqual(config_getint('verbose'), sys.flags.verbose)
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# PyConfig_MEMBER_UINT type
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self.assertEqual(config_getint('isolated'), sys.flags.isolated)
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# PyConfig_MEMBER_ULONG type
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self.assertIsInstance(config_getint('hash_seed'), int)
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# PyPreConfig member
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self.assertIsInstance(config_getint('allocator'), int)
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# platlibdir type is str
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with self.assertRaises(TypeError):
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config_getint('platlibdir')
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def test_get_config_names(self):
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names = _testcapi.config_names()
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self.assertIsInstance(names, frozenset)
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for name in names:
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self.assertIsInstance(name, str)
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def test_config_set_sys_attr(self):
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# Test PyConfig_Set() with sys attributes
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config_get = _testcapi.config_get
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config_set = _testcapi.config_set
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# mutable configuration option mapped to sys attributes
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for name, sys_attr, option_type in (
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('argv', 'argv', list[str]),
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('base_exec_prefix', 'base_exec_prefix', str | None),
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('base_executable', '_base_executable', str | None),
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('base_prefix', 'base_prefix', str | None),
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('exec_prefix', 'exec_prefix', str | None),
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('executable', 'executable', str | None),
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('module_search_paths', 'path', list[str]),
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('platlibdir', 'platlibdir', str),
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('prefix', 'prefix', str | None),
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('pycache_prefix', 'pycache_prefix', str | None),
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('stdlib_dir', '_stdlib_dir', str | None),
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('warnoptions', 'warnoptions', list[str]),
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('xoptions', '_xoptions', dict[str, str | bool]),
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):
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with self.subTest(name=name):
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if option_type == str:
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test_values = ('TEST_REPLACE',)
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invalid_types = (1, None)
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elif option_type == str | None:
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test_values = ('TEST_REPLACE', None)
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invalid_types = (123,)
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elif option_type == list[str]:
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test_values = (['TEST_REPLACE'], [])
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invalid_types = ('text', 123, [123])
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else: # option_type == dict[str, str | bool]:
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test_values = ({"x": "value", "y": True},)
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invalid_types = ('text', 123, ['option'],
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{123: 'value'},
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{'key': b'bytes'})
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old_opt_value = config_get(name)
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old_sys_value = getattr(sys, sys_attr)
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try:
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for value in test_values:
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config_set(name, value)
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self.assertEqual(config_get(name), value)
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self.assertEqual(getattr(sys, sys_attr), value)
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for value in invalid_types:
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with self.assertRaises(TypeError):
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config_set(name, value)
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finally:
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setattr(sys, sys_attr, old_sys_value)
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config_set(name, old_opt_value)
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def test_config_set_sys_flag(self):
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# Test PyConfig_Set() with sys.flags
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config_get = _testcapi.config_get
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config_set = _testcapi.config_set
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# mutable configuration option mapped to sys.flags
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class unsigned_int(int):
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pass
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def expect_int(value):
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value = int(value)
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return (value, value)
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def expect_bool(value):
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value = int(bool(value))
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return (value, value)
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def expect_bool_not(value):
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value = bool(value)
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return (int(value), int(not value))
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for name, sys_flag, option_type, expect_func in (
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# (some flags cannot be set, see comments below.)
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('parser_debug', 'debug', bool, expect_bool),
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('inspect', 'inspect', bool, expect_bool),
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('interactive', 'interactive', bool, expect_bool),
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('optimization_level', 'optimize', unsigned_int, expect_int),
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('write_bytecode', 'dont_write_bytecode', bool, expect_bool_not),
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# user_site_directory
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# site_import
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('use_environment', 'ignore_environment', bool, expect_bool_not),
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('verbose', 'verbose', unsigned_int, expect_int),
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('bytes_warning', 'bytes_warning', unsigned_int, expect_int),
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('quiet', 'quiet', bool, expect_bool),
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# hash_randomization
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# isolated
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# dev_mode
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# utf8_mode
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# warn_default_encoding
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# safe_path
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('int_max_str_digits', 'int_max_str_digits', unsigned_int, expect_int),
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# gil
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):
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if name == "int_max_str_digits":
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new_values = (0, 5_000, 999_999)
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invalid_values = (-1, 40) # value must 0 or >= 4300
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invalid_types = (1.0, "abc")
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elif option_type == int:
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new_values = (False, True, 0, 1, 5, -5)
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invalid_values = ()
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invalid_types = (1.0, "abc")
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else:
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new_values = (False, True, 0, 1, 5)
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invalid_values = (-5,)
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invalid_types = (1.0, "abc")
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with self.subTest(name=name):
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old_value = config_get(name)
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try:
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for value in new_values:
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expected, expect_flag = expect_func(value)
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config_set(name, value)
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self.assertEqual(config_get(name), expected)
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self.assertEqual(getattr(sys.flags, sys_flag), expect_flag)
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if name == "write_bytecode":
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self.assertEqual(getattr(sys, "dont_write_bytecode"),
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expect_flag)
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if name == "int_max_str_digits":
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self.assertEqual(sys.get_int_max_str_digits(),
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expect_flag)
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for value in invalid_values:
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with self.assertRaises(ValueError):
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config_set(name, value)
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for value in invalid_types:
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with self.assertRaises(TypeError):
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config_set(name, value)
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finally:
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config_set(name, old_value)
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def test_config_set_read_only(self):
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# Test PyConfig_Set() on read-only options
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config_set = _testcapi.config_set
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for name, value in (
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("allocator", 0), # PyPreConfig member
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("cpu_count", 8),
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("dev_mode", True),
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("filesystem_encoding", "utf-8"),
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):
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with self.subTest(name=name, value=value):
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with self.assertRaisesRegex(ValueError, r"read-only"):
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config_set(name, value)
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if __name__ == "__main__":
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unittest.main()
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