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#!/usr/bin/env python
import os
from builtins import range
from functools import reduce
def get_libcxx_paths():
utils_path = os.path.dirname(os.path.abspath(__file__))
script_name = os.path.basename(__file__)
assert os.path.exists(utils_path)
src_root = os.path.dirname(utils_path)
include_path = os.path.join(src_root, 'include')
assert os.path.exists(include_path)
docs_path = os.path.join(src_root, 'docs')
assert os.path.exists(docs_path)
macro_test_path = os.path.join(src_root, 'test', 'std', 'language.support',
'support.limits', 'support.limits.general')
assert os.path.exists(macro_test_path)
assert os.path.exists(os.path.join(macro_test_path, 'version.version.compile.pass.cpp'))
return script_name, src_root, include_path, docs_path, macro_test_path
script_name, source_root, include_path, docs_path, macro_test_path = get_libcxx_paths()
def has_header(h):
h_path = os.path.join(include_path, h)
return os.path.exists(h_path)
def add_version_header(tc):
tc["headers"].append("version")
return tc
# ================ ============================================================
# Field Description
# ================ ============================================================
# name The name of the feature-test macro.
# values A dict whose keys are C++ versions and whose values are the
# value of the feature-test macro for that C++ version.
# (TODO: This isn't a very clean model for feature-test
# macros affected by multiple papers.)
# headers An array with the headers that should provide the
# feature-test macro.
# test_suite_guard An optional string field. When this field is provided,
# `libcxx_guard` must also be provided. This field is used
# only to generate the unit tests for the feature-test macros.
# It can't depend on macros defined in <__config> because the
# `test/std/` parts of the test suite are intended to be
# portable to any C++ standard library implementation, not
# just libc++. It may depend on
# * macros defined by the compiler itself, or
# * macros generated by CMake.
# In some cases we add
# `&& !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM_...)`
# in order to make libc++ pass the tests on OSX; see D94983.
# libcxx_guard An optional string field. When this field is provided,
# `test_suite_guard` must also be provided. This field is used
# only to guard the feature-test macro in <version>. It may
# be the same as `test_suite_guard`, or it may depend on
# macros defined in <__config>.
# unimplemented An optional Boolean field with the value `True`. This field
# is only used when a feature isn't fully implemented. Once
# you've fully implemented the feature, you should remove
# this field.
# ================ ============================================================
feature_test_macros = [ add_version_header(x) for x in [
{
"name": "__cpp_lib_adaptor_iterator_pair_constructor",
"values": { "c++2b": 202106 },
"headers": ["queue", "stack"],
}, {
"name": "__cpp_lib_addressof_constexpr",
"values": { "c++17": 201603 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_allocate_at_least",
"values": { "c++2b": 202106 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_allocator_traits_is_always_equal",
"values": { "c++17": 201411 },
"headers": ["deque", "forward_list", "list", "map", "memory", "scoped_allocator", "set", "string", "unordered_map", "unordered_set", "vector"],
}, {
"name": "__cpp_lib_any",
"values": { "c++17": 201606 },
"headers": ["any"],
}, {
"name": "__cpp_lib_apply",
"values": { "c++17": 201603 },
"headers": ["tuple"],
}, {
"name": "__cpp_lib_array_constexpr",
"values": { "c++17": 201603, "c++20": 201811 },
"headers": ["array", "iterator"],
}, {
"name": "__cpp_lib_as_const",
"values": { "c++17": 201510 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_associative_heterogeneous_erasure",
"values": { "c++2b": 202110 },
"headers": ["map", "set", "unordered_map", "unordered_set"],
"unimplemented": True,
}, {
"name": "__cpp_lib_assume_aligned",
"values": { "c++20": 201811 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_atomic_flag_test",
"values": { "c++20": 201907 },
"headers": ["atomic"],
}, {
"name": "__cpp_lib_atomic_float",
"values": { "c++20": 201711 },
"headers": ["atomic"],
"unimplemented": True,
}, {
"name": "__cpp_lib_atomic_is_always_lock_free",
"values": { "c++17": 201603 },
"headers": ["atomic"],
}, {
"name": "__cpp_lib_atomic_lock_free_type_aliases",
"values": { "c++20": 201907 },
"headers": ["atomic"],
}, {
"name": "__cpp_lib_atomic_ref",
"values": { "c++20": 201806 },
"headers": ["atomic"],
"unimplemented": True,
}, {
"name": "__cpp_lib_atomic_shared_ptr",
"values": { "c++20": 201711 },
"headers": ["atomic"],
"unimplemented": True,
}, {
"name": "__cpp_lib_atomic_value_initialization",
"values": { "c++20": 201911 },
"headers": ["atomic", "memory"],
}, {
"name": "__cpp_lib_atomic_wait",
"values": { "c++20": 201907 },
"headers": ["atomic"],
"test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)",
"libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_atomic_wait)",
}, {
"name": "__cpp_lib_barrier",
"values": { "c++20": 201907 },
"headers": ["barrier"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_barrier)",
}, {
"name": "__cpp_lib_bind_back",
"values": { "c++2b": 202202 },
"headers": ["functional"],
"unimplemented": True,
}, {
"name": "__cpp_lib_bind_front",
"values": { "c++20": 201907 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_bit_cast",
"values": { "c++20": 201806 },
"headers": ["bit"],
}, {
"name": "__cpp_lib_bitops",
"values": { "c++20": 201907 },
"headers": ["bit"],
"unimplemented": True,
}, {
"name": "__cpp_lib_bool_constant",
"values": { "c++17": 201505 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_bounded_array_traits",
"values": { "c++20": 201902 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_boyer_moore_searcher",
"values": { "c++17": 201603 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_byte",
"values": { "c++17": 201603 },
"headers": ["cstddef"],
}, {
"name": "__cpp_lib_byteswap",
"values": { "c++2b": 202110 },
"headers": ["bit"],
}, {
"name": "__cpp_lib_char8_t",
"values": { "c++20": 201907 },
"headers": ["atomic", "filesystem", "istream", "limits", "locale", "ostream", "string", "string_view"],
"test_suite_guard": "defined(__cpp_char8_t)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_CHAR8_T)",
}, {
"name": "__cpp_lib_chrono",
"values": { "c++17": 201611 },
"headers": ["chrono"],
}, {
"name": "__cpp_lib_chrono_udls",
"values": { "c++14": 201304 },
"headers": ["chrono"],
}, {
"name": "__cpp_lib_clamp",
"values": { "c++17": 201603 },
"headers": ["algorithm"],
}, {
"name": "__cpp_lib_complex_udls",
"values": { "c++14": 201309 },
"headers": ["complex"],
}, {
"name": "__cpp_lib_concepts",
"values": { "c++20": 202002 },
"headers": ["concepts"],
}, {
"name": "__cpp_lib_constexpr_algorithms",
"values": { "c++20": 201806 },
"headers": ["algorithm"],
}, {
"name": "__cpp_lib_constexpr_bitset",
"values": { "c++2b": 202207 },
"headers": ["bitset"],
}, {
"name": "__cpp_lib_constexpr_cmath",
"values": { "c++2b": 202202 },
"headers": ["cmath", "cstdlib"],
"unimplemented": True,
}, {
"name": "__cpp_lib_constexpr_complex",
"values": { "c++20": 201711 },
"headers": ["complex"],
"unimplemented": True,
}, {
"name": "__cpp_lib_constexpr_dynamic_alloc",
"values": { "c++20": 201907 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_constexpr_functional",
"values": { "c++20": 201907 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_constexpr_iterator",
"values": { "c++20": 201811 },
"headers": ["iterator"],
}, {
"name": "__cpp_lib_constexpr_memory",
"values": { "c++20": 201811 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_constexpr_numeric",
"values": { "c++20": 201911 },
"headers": ["numeric"],
}, {
"name": "__cpp_lib_constexpr_string",
"values": { "c++20": 201907 },
"headers": ["string"],
}, {
"name": "__cpp_lib_constexpr_string_view",
"values": { "c++20": 201811 },
"headers": ["string_view"],
}, {
"name": "__cpp_lib_constexpr_tuple",
"values": { "c++20": 201811 },
"headers": ["tuple"],
}, {
"name": "__cpp_lib_constexpr_typeinfo",
"values": { "c++2b": 202106 },
"headers": ["typeinfo"],
"unimplemented": True,
}, {
"name": "__cpp_lib_constexpr_utility",
"values": { "c++20": 201811 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_constexpr_vector",
"values": { "c++20": 201907 },
"headers": ["vector"],
"unimplemented": True,
}, {
"name": "__cpp_lib_coroutine",
"values": { "c++20": 201902 },
"headers": ["coroutine"],
}, {
"name": "__cpp_lib_destroying_delete",
"values": { "c++20": 201806 },
"headers": ["new"],
"test_suite_guard": "TEST_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L",
"libcxx_guard": "_LIBCPP_STD_VER > 17 && defined(__cpp_impl_destroying_delete) && __cpp_impl_destroying_delete >= 201806L",
}, {
"name": "__cpp_lib_enable_shared_from_this",
"values": { "c++17": 201603 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_endian",
"values": { "c++20": 201907 },
"headers": ["bit"],
}, {
"name": "__cpp_lib_erase_if",
"values": { "c++20": 202002 },
"headers": ["deque", "forward_list", "list", "map", "set", "string", "unordered_map", "unordered_set", "vector"],
}, {
"name": "__cpp_lib_exchange_function",
"values": { "c++14": 201304 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_execution",
"values": { "c++17": 201603, "c++20": 201902 },
"headers": ["execution"],
"unimplemented": True,
}, {
"name": "__cpp_lib_filesystem",
"values": { "c++17": 201703 },
"headers": ["filesystem"],
"test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)",
"libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_filesystem)"
}, {
"name": "__cpp_lib_format",
# P2508, P2286, and P2419 were accepted in the same plenary and modify this
# feature-test macro. We expect to see an LWG issue soon. For now keep the
# value as is.
# TODO FMT Set P2508's feature-test macro.
#"values": { "c++20": 202106, "c++23": 202207" },
"values": { "c++20": 202106 },
"headers": ["format"],
"test_suite_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
"libcxx_guard": "!defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_format) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)",
}, {
"name": "__cpp_lib_gcd_lcm",
"values": { "c++17": 201606 },
"headers": ["numeric"],
}, {
"name": "__cpp_lib_generic_associative_lookup",
"values": { "c++14": 201304 },
"headers": ["map", "set"],
}, {
"name": "__cpp_lib_generic_unordered_lookup",
"values": { "c++20": 201811 },
"headers": ["unordered_map", "unordered_set"],
}, {
"name": "__cpp_lib_hardware_interference_size",
"values": { "c++17": 201703 },
"test_suite_guard": "defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)",
"libcxx_guard": "defined(__GCC_DESTRUCTIVE_SIZE) && defined(__GCC_CONSTRUCTIVE_SIZE)",
"headers": ["new"],
}, {
"name": "__cpp_lib_has_unique_object_representations",
"values": { "c++17": 201606 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_hypot",
"values": { "c++17": 201603 },
"headers": ["cmath"],
}, {
"name": "__cpp_lib_incomplete_container_elements",
"values": { "c++17": 201505 },
"headers": ["forward_list", "list", "vector"],
}, {
"name": "__cpp_lib_int_pow2",
"values": { "c++20": 202002 },
"headers": ["bit"],
}, {
"name": "__cpp_lib_integer_comparison_functions",
"values": { "c++20": 202002 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_integer_sequence",
"values": { "c++14": 201304 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_integral_constant_callable",
"values": { "c++14": 201304 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_interpolate",
"values": { "c++20": 201902 },
"headers": ["cmath", "numeric"],
}, {
"name": "__cpp_lib_invoke",
"values": { "c++17": 201411 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_invoke_r",
"values": { "c++2b": 202106 },
"headers": ["functional"],
"unimplemented": True,
}, {
"name": "__cpp_lib_is_aggregate",
"values": { "c++17": 201703 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_constant_evaluated",
"values": { "c++20": 201811 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_final",
"values": { "c++14": 201402 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_invocable",
"values": { "c++17": 201703 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_layout_compatible",
"values": { "c++20": 201907 },
"headers": ["type_traits"],
"unimplemented": True,
}, {
"name": "__cpp_lib_is_nothrow_convertible",
"values": { "c++20": 201806 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_null_pointer",
"values": { "c++14": 201309 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_pointer_interconvertible",
"values": { "c++20": 201907 },
"headers": ["type_traits"],
"unimplemented": True,
}, {
"name": "__cpp_lib_is_scoped_enum",
"values": { "c++2b": 202011 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_is_swappable",
"values": { "c++17": 201603 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_jthread",
"values": { "c++20": 201911 },
"headers": ["stop_token", "thread"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS)",
"unimplemented": True,
}, {
"name": "__cpp_lib_latch",
"values": { "c++20": 201907 },
"headers": ["latch"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_latch)",
}, {
"name": "__cpp_lib_launder",
"values": { "c++17": 201606 },
"headers": ["new"],
}, {
"name": "__cpp_lib_list_remove_return_type",
"values": { "c++20": 201806 },
"headers": ["forward_list", "list"],
}, {
"name": "__cpp_lib_logical_traits",
"values": { "c++17": 201510 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_make_from_tuple",
"values": { "c++17": 201606 },
"headers": ["tuple"],
}, {
"name": "__cpp_lib_make_reverse_iterator",
"values": { "c++14": 201402 },
"headers": ["iterator"],
}, {
"name": "__cpp_lib_make_unique",
"values": { "c++14": 201304 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_map_try_emplace",
"values": { "c++17": 201411 },
"headers": ["map"],
}, {
"name": "__cpp_lib_math_constants",
"values": { "c++20": 201907 },
"headers": ["numbers"],
}, {
"name": "__cpp_lib_math_special_functions",
"values": { "c++17": 201603 },
"headers": ["cmath"],
"unimplemented": True,
}, {
"name": "__cpp_lib_memory_resource",
"values": { "c++17": 201603 },
"headers": ["memory_resource"],
"unimplemented": True,
}, {
"name": "__cpp_lib_move_only_function",
"values": { "c++2b": 202110 },
"headers": ["functional"],
"unimplemented": True,
}, {
"name": "__cpp_lib_node_extract",
"values": { "c++17": 201606 },
"headers": ["map", "set", "unordered_map", "unordered_set"],
}, {
"name": "__cpp_lib_nonmember_container_access",
"values": { "c++17": 201411 },
"headers": ["array", "deque", "forward_list", "iterator", "list", "map", "regex", "set", "string", "unordered_map", "unordered_set", "vector"],
}, {
"name": "__cpp_lib_not_fn",
"values": { "c++17": 201603 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_null_iterators",
"values": { "c++14": 201304 },
"headers": ["iterator"],
}, {
"name": "__cpp_lib_optional",
"values": { "c++17": 201606, "c++2b": 202110 },
"headers": ["optional"],
}, {
"name": "__cpp_lib_out_ptr",
"values": { "c++2b": 202106 },
"headers": ["memory"],
"unimplemented": True,
}, {
"name": "__cpp_lib_parallel_algorithm",
"values": { "c++17": 201603 },
"headers": ["algorithm", "numeric"],
"unimplemented": True,
}, {
"name": "__cpp_lib_polymorphic_allocator",
"values": { "c++20": 201902 },
"headers": ["memory_resource"],
"unimplemented": True,
}, {
"name": "__cpp_lib_quoted_string_io",
"values": { "c++14": 201304 },
"headers": ["iomanip"],
}, {
"name": "__cpp_lib_ranges",
"values": { "c++20": 201811 },
"headers": ["algorithm", "functional", "iterator", "memory", "ranges"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_INCOMPLETE_RANGES)",
}, {
"name": "__cpp_lib_ranges_chunk",
"values": { "c++2b": 202202 },
"headers": ["ranges"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_chunk_by",
"values": { "c++2b": 202202 },
"headers": ["ranges"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_iota",
"values": { "c++2b": 202202 },
"headers": ["numeric"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_join_with",
"values": { "c++2b": 202202 },
"headers": ["ranges"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_slide",
"values": { "c++2b": 202202 },
"headers": ["ranges"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_starts_ends_with",
"values": { "c++2b": 202106 },
"headers": ["algorithm"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_to_container",
"values": { "c++2b": 202202 },
"headers": ["deque", "forward_list", "list", "map", "priority_queue", "queue", "set", "stack", "string", "unordered_map", "unordered_set", "vector"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ranges_zip",
"values": { "c++2b": 202110 },
"headers": ["ranges", "tuple", "utility"],
"unimplemented": True,
}, {
"name": "__cpp_lib_raw_memory_algorithms",
"values": { "c++17": 201606 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_reference_from_temporary",
"values": { "c++2b": 202202 },
"headers": ["type_traits"],
"unimplemented": True,
}, {
"name": "__cpp_lib_remove_cvref",
"values": { "c++20": 201711 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_result_of_sfinae",
"values": { "c++14": 201210 },
"headers": ["functional", "type_traits"],
}, {
"name": "__cpp_lib_robust_nonmodifying_seq_ops",
"values": { "c++14": 201304 },
"headers": ["algorithm"],
}, {
"name": "__cpp_lib_sample",
"values": { "c++17": 201603 },
"headers": ["algorithm"],
}, {
"name": "__cpp_lib_scoped_lock",
"values": { "c++17": 201703 },
"headers": ["mutex"],
}, {
"name": "__cpp_lib_semaphore",
"values": { "c++20": 201907 },
"headers": ["semaphore"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_semaphore)",
}, {
"name": "__cpp_lib_shared_mutex",
"values": { "c++17": 201505 },
"headers": ["shared_mutex"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_mutex)",
}, {
"name": "__cpp_lib_shared_ptr_arrays",
"values": { "c++17": 201611, "c++20": 201707 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_shared_ptr_weak_type",
"values": { "c++17": 201606 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_shared_timed_mutex",
"values": { "c++14": 201402 },
"headers": ["shared_mutex"],
"test_suite_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)",
"libcxx_guard": "!defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_AVAILABILITY_DISABLE_FTM___cpp_lib_shared_timed_mutex)",
}, {
"name": "__cpp_lib_shift",
"values": { "c++20": 201806 },
"headers": ["algorithm"],
}, {
"name": "__cpp_lib_smart_ptr_for_overwrite",
"values": { "c++20": 202002 },
"headers": ["memory"],
"unimplemented": True,
}, {
"name": "__cpp_lib_source_location",
"values": { "c++20": 201907 },
"headers": ["source_location"],
"unimplemented": True,
}, {
"name": "__cpp_lib_span",
"values": { "c++20": 202002 },
"headers": ["span"],
}, {
"name": "__cpp_lib_spanstream",
"values": { "c++2b": 202106 },
"headers": ["spanstream"],
"unimplemented": True,
}, {
"name": "__cpp_lib_ssize",
"values": { "c++20": 201902 },
"headers": ["iterator"],
}, {
"name": "__cpp_lib_stacktrace",
"values": { "c++2b": 202011 },
"headers": ["stacktrace"],
"unimplemented": True,
}, {
"name": "__cpp_lib_starts_ends_with",
"values": { "c++20": 201711 },
"headers": ["string", "string_view"],
}, {
"name": "__cpp_lib_stdatomic_h",
"values": { "c++2b": 202011 },
"headers": ["stdatomic.h"],
}, {
"name": "__cpp_lib_string_contains",
"values": { "c++2b": 202011 },
"headers": ["string", "string_view"],
}, {
"name": "__cpp_lib_string_resize_and_overwrite",
"values": { "c++2b": 202110 },
"headers": ["string"],
}, {
"name": "__cpp_lib_string_udls",
"values": { "c++14": 201304 },
"headers": ["string"],
}, {
"name": "__cpp_lib_string_view",
"values": { "c++17": 201606, "c++20": 201803 },
"headers": ["string", "string_view"],
}, {
"name": "__cpp_lib_syncbuf",
"values": { "c++20": 201803 },
"headers": ["syncstream"],
"unimplemented": True,
}, {
"name": "__cpp_lib_three_way_comparison",
"values": { "c++20": 201907 },
"headers": ["compare"],
"unimplemented": True,
}, {
"name": "__cpp_lib_to_address",
"values": { "c++20": 201711 },
"headers": ["memory"],
}, {
"name": "__cpp_lib_to_array",
"values": { "c++20": 201907 },
"headers": ["array"],
}, {
"name": "__cpp_lib_to_chars",
"values": { "c++17": 201611 },
"headers": ["charconv"],
"unimplemented": True,
}, {
"name": "__cpp_lib_to_underlying",
"values": { "c++2b": 202102 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_transformation_trait_aliases",
"values": { "c++14": 201304 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_transparent_operators",
"values": { "c++14": 201210, "c++17": 201510 },
"headers": ["functional", "memory"],
}, {
"name": "__cpp_lib_tuple_element_t",
"values": { "c++14": 201402 },
"headers": ["tuple"],
}, {
"name": "__cpp_lib_tuples_by_type",
"values": { "c++14": 201304 },
"headers": ["tuple", "utility"],
}, {
"name": "__cpp_lib_type_identity",
"values": { "c++20": 201806 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_type_trait_variable_templates",
"values": { "c++17": 201510 },
"headers": ["type_traits"],
}, {
"name": "__cpp_lib_uncaught_exceptions",
"values": { "c++17": 201411 },
"headers": ["exception"],
}, {
"name": "__cpp_lib_unordered_map_try_emplace",
"values": { "c++17": 201411 },
"headers": ["unordered_map"],
}, {
"name": "__cpp_lib_unreachable",
"values": { "c++2b": 202202 },
"headers": ["utility"],
}, {
"name": "__cpp_lib_unwrap_ref",
"values": { "c++20": 201811 },
"headers": ["functional"],
}, {
"name": "__cpp_lib_variant",
"values": { "c++17": 202102 },
"headers": ["variant"],
}, {
"name": "__cpp_lib_void_t",
"values": { "c++17": 201411 },
"headers": ["type_traits"],
}
]]
assert feature_test_macros == sorted(feature_test_macros, key=lambda tc: tc["name"])
assert all(tc["headers"] == sorted(tc["headers"]) for tc in feature_test_macros)
assert all(("libcxx_guard" in tc) == ("test_suite_guard" in tc) for tc in feature_test_macros)
assert all(all(key in ["name", "values", "headers", "libcxx_guard", "test_suite_guard", "unimplemented"] for key in tc.keys()) for tc in feature_test_macros)
# Map from each header to the Lit annotations that should be used for
# tests that include that header.
#
# For example, when threads are not supported, any test that includes
# <thread> should be marked as UNSUPPORTED, because including <thread>
# is a hard error in that case.
lit_markup = {
"barrier": ["UNSUPPORTED: no-threads"],
"filesystem": ["UNSUPPORTED: no-filesystem"],
"format": ["UNSUPPORTED: libcpp-has-no-incomplete-format"],
"iomanip": ["UNSUPPORTED: no-localization"],
"ios": ["UNSUPPORTED: no-localization"],
"iostream": ["UNSUPPORTED: no-localization"],
"istream": ["UNSUPPORTED: no-localization"],
"latch": ["UNSUPPORTED: no-threads"],
"locale": ["UNSUPPORTED: no-localization"],
"mutex": ["UNSUPPORTED: no-threads"],
"ostream": ["UNSUPPORTED: no-localization"],
"ranges": ["UNSUPPORTED: libcpp-has-no-incomplete-ranges"],
"regex": ["UNSUPPORTED: no-localization"],
"semaphore": ["UNSUPPORTED: no-threads"],
"shared_mutex": ["UNSUPPORTED: no-threads"],
"stdatomic.h": ["UNSUPPORTED: no-threads"],
"thread": ["UNSUPPORTED: no-threads"],
}
def get_std_dialects():
std_dialects = ['c++14', 'c++17', 'c++20', 'c++2b']
return list(std_dialects)
def get_first_std(d):
for s in get_std_dialects():
if s in d.keys():
return s
return None
def get_last_std(d):
rev_dialects = get_std_dialects()
rev_dialects.reverse()
for s in rev_dialects:
if s in d.keys():
return s
return None
def get_std_before(d, std):
std_dialects = get_std_dialects()
candidates = std_dialects[0:std_dialects.index(std)]
candidates.reverse()
for cand in candidates:
if cand in d.keys():
return cand
return None
def get_value_before(d, std):
new_std = get_std_before(d, std)
if new_std is None:
return None
return d[new_std]
def get_for_std(d, std):
# This catches the C++11 case for which there should be no defined feature
# test macros.
std_dialects = get_std_dialects()
if std not in std_dialects:
return None
# Find the value for the newest C++ dialect between C++14 and std
std_list = list(std_dialects[0:std_dialects.index(std)+1])
std_list.reverse()
for s in std_list:
if s in d.keys():
return d[s]
return None
def get_std_number(std):
return std.replace('c++', '')
"""
Functions to produce the <version> header
"""
def produce_macros_definition_for_std(std):
result = ""
indent = 55
for tc in feature_test_macros:
if std not in tc["values"]:
continue
inner_indent = 1
if 'test_suite_guard' in tc.keys():
result += "# if %s\n" % tc["libcxx_guard"]
inner_indent += 2
if get_value_before(tc["values"], std) is not None:
assert 'test_suite_guard' not in tc.keys()
result += "# undef %s\n" % tc["name"]
line = "#%sdefine %s" % ((" " * inner_indent), tc["name"])
line += " " * (indent - len(line))
line += " %sL" % tc["values"][std]
if 'unimplemented' in tc.keys():
line = "// " + line
result += line
result += "\n"
if 'test_suite_guard' in tc.keys():
result += "# endif\n"
return result.strip()
def produce_macros_definitions():
macro_definition_template = """#if _LIBCPP_STD_VER > {previous_std_number}
{macro_definition}
#endif"""
macros_definitions = []
previous_std_number = '11'
for std in get_std_dialects():
macros_definitions.append(
macro_definition_template.format(previous_std_number=previous_std_number,
macro_definition=produce_macros_definition_for_std(std)))
previous_std_number = get_std_number(std)
return '\n\n'.join(macros_definitions)
def chunks(l, n):
"""Yield successive n-sized chunks from l."""
for i in range(0, len(l), n):
yield l[i:i + n]
def produce_version_synopsis():
indent = 56
header_indent = 56 + len("20XXYYL ")
result = ""
def indent_to(s, val):
if len(s) >= val:
return s
s += " " * (val - len(s))
return s
line = indent_to("Macro name", indent) + "Value"
line = indent_to(line, header_indent) + "Headers"
result += line + "\n"
for tc in feature_test_macros:
prev_defined_std = get_last_std(tc["values"])
line = "{name: <{indent}}{value}L ".format(name=tc['name'], indent=indent,
value=tc["values"][prev_defined_std])
headers = list(tc["headers"])
headers.remove("version")
for chunk in chunks(headers, 3):
line = indent_to(line, header_indent)
chunk = ['<%s>' % header for header in chunk]
line += ' '.join(chunk)
result += line
result += "\n"
line = ""
while True:
prev_defined_std = get_std_before(tc["values"], prev_defined_std)
if prev_defined_std is None:
break
result += "%s%sL // %s\n" % (indent_to("", indent), tc["values"][prev_defined_std],
prev_defined_std.replace("c++", "C++"))
return result
def produce_version_header():
template="""// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_VERSIONH
#define _LIBCPP_VERSIONH
/*
version synopsis
{synopsis}
*/
#include <__assert> // all public C++ headers provide the assertion handler
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
// clang-format off
{cxx_macros}
// clang-format on
#endif // _LIBCPP_VERSIONH
"""
version_str = template.format(
synopsis=produce_version_synopsis().strip(),
cxx_macros=produce_macros_definitions())
version_header_path = os.path.join(include_path, 'version')
with open(version_header_path, 'w', newline='\n') as f:
f.write(version_str)
"""
Functions to produce test files
"""
test_types = {
"undefined": """
# ifdef {name}
# error "{name} should not be defined before {std_first}"
# endif
""",
"test_suite_guard": """
# if {test_suite_guard}
# ifndef {name}
# error "{name} should be defined in {std}"
# endif
# if {name} != {value}
# error "{name} should have the value {value} in {std}"
# endif
# else
# ifdef {name}
# error "{name} should not be defined when {test_suite_guard} is not defined!"
# endif
# endif
""",
"unimplemented": """
# if !defined(_LIBCPP_VERSION)
# ifndef {name}
# error "{name} should be defined in {std}"
# endif
# if {name} != {value}
# error "{name} should have the value {value} in {std}"
# endif
# else // _LIBCPP_VERSION
# ifdef {name}
# error "{name} should not be defined because it is unimplemented in libc++!"
# endif
# endif
""",
"defined": """
# ifndef {name}
# error "{name} should be defined in {std}"
# endif
# if {name} != {value}
# error "{name} should have the value {value} in {std}"
# endif
"""
}
def generate_std_test(test_list, std):
result = ""
for tc in test_list:
val = get_for_std(tc["values"], std)
if val is not None:
val = "%sL" % val
if val is None:
result += test_types["undefined"].format(name=tc["name"], std_first=get_first_std(tc["values"]))
elif 'unimplemented' in tc.keys():
result += test_types["unimplemented"].format(name=tc["name"], value=val, std=std)
elif "test_suite_guard" in tc.keys():
result += test_types["test_suite_guard"].format(name=tc["name"], value=val, std=std, test_suite_guard=tc["test_suite_guard"])
else:
result += test_types["defined"].format(name=tc["name"], value=val, std=std)
return result.strip()
def generate_std_tests(test_list):
std_tests_template = """#if TEST_STD_VER < {first_std_number}
{pre_std_test}
{other_std_tests}
#elif TEST_STD_VER > {penultimate_std_number}
{last_std_test}
#endif // TEST_STD_VER > {penultimate_std_number}"""
std_dialects = get_std_dialects()
assert not get_std_number(std_dialects[-1]).isnumeric()
other_std_tests = []
for std in std_dialects[:-1]:
other_std_tests.append('#elif TEST_STD_VER == ' + get_std_number(std))
other_std_tests.append(generate_std_test(test_list, std))
std_tests = std_tests_template.format(first_std_number=get_std_number(std_dialects[0]),
pre_std_test=generate_std_test(test_list, 'c++11'),
other_std_tests='\n\n'.join(other_std_tests),
penultimate_std_number=get_std_number(std_dialects[-2]),
last_std_test=generate_std_test(test_list, std_dialects[-1]))
return std_tests
def generate_synopsis(test_list):
max_name_len = max([len(tc["name"]) for tc in test_list])
indent = max_name_len + 8
def mk_line(prefix, suffix):
return "{prefix: <{max_len}}{suffix}\n".format(prefix=prefix, suffix=suffix,
max_len=indent)
result = ""
result += mk_line("/* Constant", "Value")
for tc in test_list:
prefix = " %s" % tc["name"]
for std in [s for s in get_std_dialects() if s in tc["values"].keys()]:
result += mk_line(prefix, "%sL [%s]" % (tc["values"][std], std.replace("c++", "C++")))
prefix = ""
result += "*/"
return result
def produce_tests():
headers = set([h for tc in feature_test_macros for h in tc["headers"]])
for h in headers:
test_list = [tc for tc in feature_test_macros if h in tc["headers"]]
if not has_header(h):
for tc in test_list:
assert 'unimplemented' in tc.keys()
continue
markup = '\n'.join('// ' + tag for tag in lit_markup.get(h, []))
test_body = \
"""//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// WARNING: This test was generated by {script_name}
// and should not be edited manually.
//
// clang-format off
{markup}
// <{header}>
// Test the feature test macros defined by <{header}>
{synopsis}
#include <{header}>
#include "test_macros.h"
{cxx_tests}
""".format(script_name=script_name,
header=h,
markup=('\n{}\n'.format(markup) if markup else ''),
synopsis=generate_synopsis(test_list),
cxx_tests=generate_std_tests(test_list))
test_name = "{header}.version.compile.pass.cpp".format(header=h)
out_path = os.path.join(macro_test_path, test_name)
with open(out_path, 'w', newline='\n') as f:
f.write(test_body)
"""
Produce documentation for the feature test macros
"""
def make_widths(grid):
widths = []
for i in range(0, len(grid[0])):
cell_width = 2 + max(reduce(lambda x,y: x+y, [[len(row[i])] for row in grid], []))
widths += [cell_width]
return widths
def create_table(grid, indent):
indent_str = ' '*indent
col_widths = make_widths(grid)
result = [indent_str + add_divider(col_widths, 2)]
header_flag = 2
for row_i in range(0, len(grid)):
row = grid[row_i]
line = indent_str + ' '.join([pad_cell(row[i], col_widths[i]) for i in range(0, len(row))])
result.append(line.rstrip())
is_cxx_header = row[0].startswith('**')
if row_i == len(grid) - 1:
header_flag = 2
separator = indent_str + add_divider(col_widths, 1 if is_cxx_header else header_flag)
result.append(separator.rstrip())
header_flag = 0
return '\n'.join(result)
def add_divider(widths, header_flag):
if header_flag == 2:
return ' '.join(['='*w for w in widths])
if header_flag == 1:
return '-'.join(['-'*w for w in widths])
else:
return ' '.join(['-'*w for w in widths])
def pad_cell(s, length, left_align=True):
padding = ((length - len(s)) * ' ')
return s + padding
def get_status_table():
table = [["Macro Name", "Value"]]
for std in get_std_dialects():
table += [["**" + std.replace("c++", "C++ ") + "**", ""]]
for tc in feature_test_macros:
if std not in tc["values"].keys():
continue
value = "``%sL``" % tc["values"][std]
if 'unimplemented' in tc.keys():
value = '*unimplemented*'
table += [["``%s``" % tc["name"], value]]
return table
def produce_docs():
doc_str = """.. _FeatureTestMacroTable:
==========================
Feature Test Macro Support
==========================
.. contents::
:local:
Overview
========
This file documents the feature test macros currently supported by libc++.
.. _feature-status:
Status
======
.. table:: Current Status
:name: feature-status-table
:widths: auto
{status_tables}
""".format(status_tables=create_table(get_status_table(), 4))
table_doc_path = os.path.join(docs_path, 'FeatureTestMacroTable.rst')
with open(table_doc_path, 'w', newline='\n') as f:
f.write(doc_str)
def main():
produce_version_header()
produce_tests()
produce_docs()
if __name__ == '__main__':
main()
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