llvm-project/libcxx/include/__config

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2010-05-12 03:42:16 +08:00
// -*- C++ -*-
//===--------------------------- __config ---------------------------------===//
//
// 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
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//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_CONFIG
#define _LIBCPP_CONFIG
#if defined(_MSC_VER) && !defined(__clang__)
# if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
# endif
#endif
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
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#pragma GCC system_header
#endif
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#ifdef __cplusplus
#ifdef __GNUC__
# define _GNUC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
// The _GNUC_VER_NEW macro better represents the new GCC versioning scheme
// introduced in GCC 5.0.
# define _GNUC_VER_NEW (_GNUC_VER * 10 + __GNUC_PATCHLEVEL__)
#else
# define _GNUC_VER 0
# define _GNUC_VER_NEW 0
#endif
#define _LIBCPP_VERSION 12000
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#ifndef _LIBCPP_ABI_VERSION
# define _LIBCPP_ABI_VERSION 1
#endif
#if __STDC_HOSTED__ == 0
# define _LIBCPP_FREESTANDING
#endif
#ifndef _LIBCPP_STD_VER
# if __cplusplus <= 201103L
# define _LIBCPP_STD_VER 11
# elif __cplusplus <= 201402L
# define _LIBCPP_STD_VER 14
# elif __cplusplus <= 201703L
# define _LIBCPP_STD_VER 17
# else
# define _LIBCPP_STD_VER 18 // current year, or date of c++2a ratification
# endif
#endif // _LIBCPP_STD_VER
#if defined(__ELF__)
# define _LIBCPP_OBJECT_FORMAT_ELF 1
#elif defined(__MACH__)
# define _LIBCPP_OBJECT_FORMAT_MACHO 1
#elif defined(_WIN32)
# define _LIBCPP_OBJECT_FORMAT_COFF 1
#elif defined(__wasm__)
# define _LIBCPP_OBJECT_FORMAT_WASM 1
#else
// ... add new file formats here ...
#endif
#if defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2
// Change short string representation so that string data starts at offset 0,
// improving its alignment in some cases.
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
// Fix deque iterator type in order to support incomplete types.
# define _LIBCPP_ABI_INCOMPLETE_TYPES_IN_DEQUE
// Fix undefined behavior in how std::list stores its linked nodes.
# define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB
Fix undefined behavior in __tree Summary: This patch attempts to fix the undefined behavior in __tree by changing the node pointer types used throughout. The pointer types are changed for raw pointers in the current ABI and for fancy pointers in ABI V2 (since the fancy pointer types may not be ABI compatible). The UB in `__tree` arises because tree downcasts the embedded end node and then deferences that pointer. Currently there are 3 node types in __tree. * `__tree_end_node` which contains the `__left_` pointer. This node is embedded within the container. * `__tree_node_base` which contains `__right_`, `__parent_` and `__is_black`. This node is used throughout the tree rebalancing algorithms. * `__tree_node` which contains `__value_`. Currently `__tree` stores the start of the tree, `__begin_node_`, as a pointer to a `__tree_node`. Additionally the iterators store their position as a pointer to a `__tree_node`. In both of these cases the pointee can be the end node. This is fixed by changing them to store `__tree_end_node` pointers instead. To make this change I introduced an `__iter_pointer` typedef which is defined to be a pointer to either `__tree_end_node` in the new ABI or `__tree_node` in the current one. Both `__tree::__begin_node_` and iterator pointers are now stored as `__iter_pointers`. The other situation where `__tree_end_node` is stored as the wrong type is in `__tree_node_base::__parent_`. Currently `__left_`, `__right_`, and `__parent_` are all `__tree_node_base` pointers. Since the end node will only be stored in `__parent_` the fix is to change `__parent_` to be a pointer to `__tree_end_node`. To make this change I introduced a `__parent_pointer` typedef which is defined to be a pointer to either `__tree_end_node` in the new ABI or `__tree_node_base` in the current one. Note that in the new ABI `__iter_pointer` and `__parent_pointer` are the same type (but not in the old one). The confusion between these two types is unfortunate but it was the best solution I could come up with that maintains the ABI. The typedef changes force a ton of explicit type casts to correct pointer types and to make current code compatible with both the old and new pointer typedefs. This is the bulk of the change and it's really messy. Unfortunately I don't know how to avoid it. Please let me know what you think. Reviewers: howard.hinnant, mclow.lists Subscribers: howard.hinnant, bbannier, cfe-commits Differential Revision: https://reviews.llvm.org/D20786 llvm-svn: 276003
2016-07-20 01:56:20 +08:00
// Fix undefined behavior in how __tree stores its end and parent nodes.
# define _LIBCPP_ABI_TREE_REMOVE_NODE_POINTER_UB
// Fix undefined behavior in how __hash_table stores its pointer types.
# define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB
[libcxx] Fix undefined behavior in forward_list Summary: This patch is similar to the <list> fix but it has a few differences. This patch doesn't use a `__link_pointer` typedef because we don't need to change the linked list pointers because `forward_list` never stores a `__forward_begin_node` in the linked list itself. The issue with `forward_list` is that the iterators store pointers to `__forward_list_node` and not `__forward_begin_node`. This is incorrect because `before_begin()` and `cbefore_begin()` return iterators that point to a `__forward_begin_node`. This means we incorrectly downcast the `__forward_begin_node` pointer to a `__node_pointer`. This downcast itself is sometimes UB but it cannot be safely removed until ABI v2. The more common cause of UB is when we deference the downcast pointer. (for example `__ptr_->__next_`). This can be fixed without an ABI break by upcasting `__ptr_` before accessing it. The fix is as follows: 1. Introduce a `__iter_node_pointer` typedef that works similar to `__link_pointer` in the last patch. In ABI v2 it is always a typedef for `__begin_node_pointer`. 2. Change the `__before_begin()` method to return the correct pointer type (`__begin_node_pointer`), Previously it incorrectly downcasted the `__forward_begin_node` to a `__node_pointer` so it could be used to constructor the iterator types. 3. Change `__forward_list_iterator` and `__forward_list_const_iterator` in the following way: 1. Change `__node_pointer __ptr_;` member to have the `__iter_node_pointer` type instead. 2. Add additional private constructors that accept `__begin_node_pointer` in addition to `__node_pointer` and then correctly cast them to the stored `__iter_node_pointer` type. 3. Add `__get_begin()` and `__get_node_unchecked()` accessor methods that correctly cast `__ptr_` to the expected pointer type. `__get_begin()` is always safe to use and should be preferred. `__get_node_unchecked()` can only be used on a deferencible iterator. 4. Replace direct access to `__forward_list_iterator::__ptr_` with the safe accessor methods. Reviewers: mclow.lists, EricWF Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D15836 llvm-svn: 258888
2016-01-27 08:11:54 +08:00
# define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB
# define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
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// Don't use a nullptr_t simulation type in C++03 instead using C++11 nullptr
// provided under the alternate keyword __nullptr, which changes the mangling
// of nullptr_t. This option is ABI incompatible with GCC in C++03 mode.
# define _LIBCPP_ABI_ALWAYS_USE_CXX11_NULLPTR
// Define the `pointer_safety` enum as a C++11 strongly typed enumeration
// instead of as a class simulating an enum. If this option is enabled
// `pointer_safety` and `get_pointer_safety()` will no longer be available
// in C++03.
# define _LIBCPP_ABI_POINTER_SAFETY_ENUM_TYPE
// Define a key function for `bad_function_call` in the library, to centralize
// its vtable and typeinfo to libc++ rather than having all other libraries
// using that class define their own copies.
# define _LIBCPP_ABI_BAD_FUNCTION_CALL_KEY_FUNCTION
// Enable optimized version of __do_get_(un)signed which avoids redundant copies.
# define _LIBCPP_ABI_OPTIMIZED_LOCALE_NUM_GET
// Use the smallest possible integer type to represent the index of the variant.
// Previously libc++ used "unsigned int" exclusively.
# define _LIBCPP_ABI_VARIANT_INDEX_TYPE_OPTIMIZATION
// Unstable attempt to provide a more optimized std::function
# define _LIBCPP_ABI_OPTIMIZED_FUNCTION
// All the regex constants must be distinct and nonzero.
# define _LIBCPP_ABI_REGEX_CONSTANTS_NONZERO
// Re-worked external template instantiations for std::string with a focus on
// performance and fast-path inlining.
# define _LIBCPP_ABI_STRING_OPTIMIZED_EXTERNAL_INSTANTIATION
// Enable clang::trivial_abi on std::unique_ptr.
# define _LIBCPP_ABI_ENABLE_UNIQUE_PTR_TRIVIAL_ABI
// Enable clang::trivial_abi on std::shared_ptr and std::weak_ptr
# define _LIBCPP_ABI_ENABLE_SHARED_PTR_TRIVIAL_ABI
#elif _LIBCPP_ABI_VERSION == 1
# if !defined(_LIBCPP_OBJECT_FORMAT_COFF)
// Enable compiling copies of now inline methods into the dylib to support
// applications compiled against older libraries. This is unnecessary with
// COFF dllexport semantics, since dllexport forces a non-inline definition
// of inline functions to be emitted anyway. Our own non-inline copy would
// conflict with the dllexport-emitted copy, so we disable it.
# define _LIBCPP_DEPRECATED_ABI_LEGACY_LIBRARY_DEFINITIONS_FOR_INLINE_FUNCTIONS
# endif
// Feature macros for disabling pre ABI v1 features. All of these options
// are deprecated.
# if defined(__FreeBSD__)
# define _LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR
# endif
#endif
#if defined(_LIBCPP_BUILDING_LIBRARY) || defined(_LIBCPP_ABI_UNSTABLE) || _LIBCPP_ABI_VERSION >= 2
// Enable additional explicit instantiations of iostreams components. This
// reduces the number of weak definitions generated in programs that use
// iostreams by providing a single strong definition in the shared library.
# define _LIBCPP_ABI_ENABLE_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1
#endif
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#define _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_X##_LIBCPP_Y
#define _LIBCPP_CONCAT(_LIBCPP_X,_LIBCPP_Y) _LIBCPP_CONCAT1(_LIBCPP_X,_LIBCPP_Y)
#ifndef _LIBCPP_ABI_NAMESPACE
# define _LIBCPP_ABI_NAMESPACE _LIBCPP_CONCAT(__,_LIBCPP_ABI_VERSION)
#endif
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#if __cplusplus < 201103L
#define _LIBCPP_CXX03_LANG
#endif
#ifndef __has_attribute
#define __has_attribute(__x) 0
#endif
#ifndef __has_builtin
#define __has_builtin(__x) 0
#endif
#ifndef __has_extension
#define __has_extension(__x) 0
#endif
#ifndef __has_feature
#define __has_feature(__x) 0
#endif
#ifndef __has_cpp_attribute
#define __has_cpp_attribute(__x) 0
#endif
// '__is_identifier' returns '0' if '__x' is a reserved identifier provided by
// the compiler and '1' otherwise.
#ifndef __is_identifier
#define __is_identifier(__x) 1
#endif
#ifndef __has_declspec_attribute
#define __has_declspec_attribute(__x) 0
#endif
#define __has_keyword(__x) !(__is_identifier(__x))
#ifndef __has_include
#define __has_include(...) 0
#endif
#if defined(__clang__)
# define _LIBCPP_COMPILER_CLANG
# ifndef __apple_build_version__
# define _LIBCPP_CLANG_VER (__clang_major__ * 100 + __clang_minor__)
# endif
#elif defined(__GNUC__)
# define _LIBCPP_COMPILER_GCC
#elif defined(_MSC_VER)
# define _LIBCPP_COMPILER_MSVC
#elif defined(__IBMCPP__)
# define _LIBCPP_COMPILER_IBM
#endif
Make GCC in C++03 Unsupported Summary: This patch make G++03 explicitly unsupported with libc++, as discussed on the mailing lists. Below is the rational for this decision. ---------------------------------------------------------------------------------------------------- libc++ claims to support GCC with C++03 ("G++03"), and this is a problem for our users. Our C++03 users are all using Clang. They must be. Less than 9% of the C++03 tests pass with GCC [1][2]. No non-trivial C++ program could work. Attempting to support G++03 impacts our QoI considerably. Unlike Clang, G++03 offers almost no C++11 extensions. If we could remove all the fallbacks for G++03, it would mean libc++ could:: * Improve Correctness: Every `#ifdef _LIBCPP_HAS_NO_<C++11-feature>` is a bug manifest. It exists to admit for deviant semantics. * Achieve ABI stability between C++03 and C++11 Differences between our C++03 and C++Rest branches contain ABI bugs. For example `std::nullptr_t` and `std::function::operator()(...)` are currently incompatible between C++11 and C++03, but could be fixed. * Decrease Compile Times and Memory Usage: Writing efficient SFINAE requires C++11. Using alias templates, libc++ could reduce the number of instantiations it produces substantially. * Decrease Binary Size Similar to the last point, G++03 forces metaprogramming techniques that emit more debug information [3] [4]. Compared to libstdc++, debug information size increases of +10% are not uncommon. Reviewers: ldionne, mclow.lists, EricWF Reviewed By: ldionne, EricWF Subscribers: zoecarver, aprantl, dexonsmith, arphaman, libcxx-commits, #libc Differential Revision: https://reviews.llvm.org/D63154 llvm-svn: 363219
2019-06-13 08:37:25 +08:00
#if defined(_LIBCPP_COMPILER_GCC) && __cplusplus < 201103L
#error "libc++ does not support using GCC with C++03. Please enable C++11"
#endif
// FIXME: ABI detection should be done via compiler builtin macros. This
// is just a placeholder until Clang implements such macros. For now assume
// that Windows compilers pretending to be MSVC++ target the Microsoft ABI,
// and allow the user to explicitly specify the ABI to handle cases where this
// heuristic falls short.
#if defined(_LIBCPP_ABI_FORCE_ITANIUM) && defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# error "Only one of _LIBCPP_ABI_FORCE_ITANIUM and _LIBCPP_ABI_FORCE_MICROSOFT can be defined"
#elif defined(_LIBCPP_ABI_FORCE_ITANIUM)
# define _LIBCPP_ABI_ITANIUM
#elif defined(_LIBCPP_ABI_FORCE_MICROSOFT)
# define _LIBCPP_ABI_MICROSOFT
#else
# if defined(_WIN32) && defined(_MSC_VER)
# define _LIBCPP_ABI_MICROSOFT
# else
# define _LIBCPP_ABI_ITANIUM
# endif
#endif
#if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
# define _LIBCPP_ABI_VCRUNTIME
#endif
// Need to detect which libc we're using if we're on Linux.
#if defined(__linux__)
# include <features.h>
# if defined(__GLIBC_PREREQ)
# define _LIBCPP_GLIBC_PREREQ(a, b) __GLIBC_PREREQ(a, b)
# else
# define _LIBCPP_GLIBC_PREREQ(a, b) 0
# endif // defined(__GLIBC_PREREQ)
#endif // defined(__linux__)
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#ifdef __LITTLE_ENDIAN__
# if __LITTLE_ENDIAN__
# define _LIBCPP_LITTLE_ENDIAN
# endif // __LITTLE_ENDIAN__
#endif // __LITTLE_ENDIAN__
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#ifdef __BIG_ENDIAN__
# if __BIG_ENDIAN__
# define _LIBCPP_BIG_ENDIAN
# endif // __BIG_ENDIAN__
#endif // __BIG_ENDIAN__
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#ifdef __BYTE_ORDER__
# if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
# define _LIBCPP_LITTLE_ENDIAN
# elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
# define _LIBCPP_BIG_ENDIAN
# endif // __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#endif // __BYTE_ORDER__
#ifdef __FreeBSD__
# include <sys/endian.h>
# include <osreldate.h>
# if _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN
# else // _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_BIG_ENDIAN
# endif // _BYTE_ORDER == _LITTLE_ENDIAN
# ifndef __LONG_LONG_SUPPORTED
# define _LIBCPP_HAS_NO_LONG_LONG
# endif // __LONG_LONG_SUPPORTED
#endif // __FreeBSD__
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#ifdef __NetBSD__
# include <sys/endian.h>
# if _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN
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# else // _BYTE_ORDER == _LITTLE_ENDIAN
# define _LIBCPP_BIG_ENDIAN
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# endif // _BYTE_ORDER == _LITTLE_ENDIAN
#endif // __NetBSD__
#if defined(_WIN32)
# define _LIBCPP_WIN32API
# define _LIBCPP_LITTLE_ENDIAN
# define _LIBCPP_SHORT_WCHAR 1
// Both MinGW and native MSVC provide a "MSVC"-like environment
# define _LIBCPP_MSVCRT_LIKE
// If mingw not explicitly detected, assume using MS C runtime only if
// a MS compatibility version is specified.
# if defined(_MSC_VER) && !defined(__MINGW32__)
# define _LIBCPP_MSVCRT // Using Microsoft's C Runtime library
# endif
# if (defined(_M_AMD64) || defined(__x86_64__)) || (defined(_M_ARM) || defined(__arm__))
# define _LIBCPP_HAS_BITSCAN64
# endif
# define _LIBCPP_HAS_OPEN_WITH_WCHAR
# if defined(_LIBCPP_MSVCRT)
# define _LIBCPP_HAS_QUICK_EXIT
# endif
// Some CRT APIs are unavailable to store apps
# if defined(WINAPI_FAMILY)
# include <winapifamily.h>
# if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && \
(!defined(WINAPI_PARTITION_SYSTEM) || \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_SYSTEM))
# define _LIBCPP_WINDOWS_STORE_APP
# endif
# endif
#endif // defined(_WIN32)
#ifdef __sun__
# include <sys/isa_defs.h>
# ifdef _LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN
# else
# define _LIBCPP_BIG_ENDIAN
# endif
#endif // __sun__
#if defined(__CloudABI__)
// Certain architectures provide arc4random(). Prefer using
// arc4random() over /dev/{u,}random to make it possible to obtain
// random data even when using sandboxing mechanisms such as chroots,
// Capsicum, etc.
# define _LIBCPP_USING_ARC4_RANDOM
#elif defined(__Fuchsia__) || defined(__wasi__)
# define _LIBCPP_USING_GETENTROPY
#elif defined(__native_client__)
// NaCl's sandbox (which PNaCl also runs in) doesn't allow filesystem access,
// including accesses to the special files under /dev. C++11's
// std::random_device is instead exposed through a NaCl syscall.
# define _LIBCPP_USING_NACL_RANDOM
#elif defined(_LIBCPP_WIN32API)
# define _LIBCPP_USING_WIN32_RANDOM
#else
# define _LIBCPP_USING_DEV_RANDOM
#endif
#if !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN)
# include <endian.h>
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define _LIBCPP_LITTLE_ENDIAN
# elif __BYTE_ORDER == __BIG_ENDIAN
# define _LIBCPP_BIG_ENDIAN
# else // __BYTE_ORDER == __BIG_ENDIAN
# error unable to determine endian
# endif
#endif // !defined(_LIBCPP_LITTLE_ENDIAN) && !defined(_LIBCPP_BIG_ENDIAN)
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#if __has_attribute(__no_sanitize__) && !defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_NO_CFI __attribute__((__no_sanitize__("cfi")))
#else
# define _LIBCPP_NO_CFI
#endif
#if __ISO_C_VISIBLE >= 2011 || __cplusplus >= 201103L
# if defined(__FreeBSD__)
# define _LIBCPP_HAS_ALIGNED_ALLOC
# define _LIBCPP_HAS_QUICK_EXIT
# if __FreeBSD_version >= 1300064 || \
(__FreeBSD_version >= 1201504 && __FreeBSD_version < 1300000)
# define _LIBCPP_HAS_TIMESPEC_GET
# endif
# elif defined(__BIONIC__)
# if __ANDROID_API__ >= 21
# define _LIBCPP_HAS_QUICK_EXIT
# endif
# if __ANDROID_API__ >= 28
# define _LIBCPP_HAS_ALIGNED_ALLOC
# endif
# if __ANDROID_API__ >= 29
# define _LIBCPP_HAS_TIMESPEC_GET
# endif
# elif defined(__Fuchsia__) || defined(__wasi__) || defined(__NetBSD__)
# define _LIBCPP_HAS_ALIGNED_ALLOC
# define _LIBCPP_HAS_QUICK_EXIT
# define _LIBCPP_HAS_TIMESPEC_GET
# elif defined(__linux__)
# if !defined(_LIBCPP_HAS_MUSL_LIBC)
# if _LIBCPP_GLIBC_PREREQ(2, 15) || defined(__BIONIC__)
# define _LIBCPP_HAS_QUICK_EXIT
# endif
# if _LIBCPP_GLIBC_PREREQ(2, 17)
# define _LIBCPP_HAS_ALIGNED_ALLOC
# define _LIBCPP_HAS_TIMESPEC_GET
# endif
# else // defined(_LIBCPP_HAS_MUSL_LIBC)
# define _LIBCPP_HAS_ALIGNED_ALLOC
# define _LIBCPP_HAS_QUICK_EXIT
# define _LIBCPP_HAS_TIMESPEC_GET
# endif
# elif defined(__APPLE__)
// timespec_get and aligned_alloc were introduced in macOS 10.15 and
// aligned releases
# if (__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 101500 || \
__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ >= 130000 || \
__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__ >= 130000 || \
__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__ >= 60000)
# define _LIBCPP_HAS_ALIGNED_ALLOC
# define _LIBCPP_HAS_TIMESPEC_GET
# endif
# endif // __APPLE__
#endif
#ifndef _LIBCPP_CXX03_LANG
# define _LIBCPP_ALIGNOF(_Tp) alignof(_Tp)
#elif defined(_LIBCPP_COMPILER_CLANG)
# define _LIBCPP_ALIGNOF(_Tp) _Alignof(_Tp)
#else
# error "We don't know a correct way to implement alignof(T) in C++03 outside of Clang"
#endif
#define _LIBCPP_PREFERRED_ALIGNOF(_Tp) __alignof(_Tp)
#if defined(_LIBCPP_COMPILER_CLANG)
#if defined(_LIBCPP_ALTERNATE_STRING_LAYOUT)
# error _LIBCPP_ALTERNATE_STRING_LAYOUT is deprecated, please use _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT instead
#endif
#if defined(__APPLE__) && !defined(__i386__) && !defined(__x86_64__) && \
(!defined(__arm__) || __ARM_ARCH_7K__ >= 2)
# define _LIBCPP_ABI_ALTERNATE_STRING_LAYOUT
#endif
#if __has_feature(cxx_alignas)
# define _ALIGNAS_TYPE(x) alignas(x)
# define _ALIGNAS(x) alignas(x)
#else
# define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
# define _ALIGNAS(x) __attribute__((__aligned__(x)))
#endif
#if __cplusplus < 201103L
typedef __char16_t char16_t;
typedef __char32_t char32_t;
#endif
#if !__has_feature(cxx_exceptions)
# define _LIBCPP_NO_EXCEPTIONS
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#endif
#if !(__has_feature(cxx_strong_enums))
#define _LIBCPP_HAS_NO_STRONG_ENUMS
#endif
#if __has_feature(cxx_attributes)
# define _LIBCPP_NORETURN [[noreturn]]
#else
# define _LIBCPP_NORETURN __attribute__ ((noreturn))
#endif
#if !(__has_feature(cxx_nullptr))
# if (__has_extension(cxx_nullptr) || __has_keyword(__nullptr)) && defined(_LIBCPP_ABI_ALWAYS_USE_CXX11_NULLPTR)
# define nullptr __nullptr
# else
# define _LIBCPP_HAS_NO_NULLPTR
# endif
#endif
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// Objective-C++ features (opt-in)
#if __has_feature(objc_arc)
#define _LIBCPP_HAS_OBJC_ARC
#endif
#if __has_feature(objc_arc_weak)
#define _LIBCPP_HAS_OBJC_ARC_WEAK
#endif
#if __has_extension(blocks)
# define _LIBCPP_HAS_EXTENSION_BLOCKS
#endif
#if defined(_LIBCPP_HAS_EXTENSION_BLOCKS) && defined(__APPLE__)
# define _LIBCPP_HAS_BLOCKS_RUNTIME
#endif
#if !(__has_feature(cxx_relaxed_constexpr))
#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR
#endif
#if !(__has_feature(cxx_variable_templates))
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#endif
#if !(__has_feature(cxx_noexcept))
#define _LIBCPP_HAS_NO_NOEXCEPT
#endif
#if !defined(_LIBCPP_HAS_NO_ASAN) && !__has_feature(address_sanitizer)
#define _LIBCPP_HAS_NO_ASAN
#endif
// Allow for build-time disabling of unsigned integer sanitization
#if !defined(_LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK) && __has_attribute(no_sanitize)
#define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK __attribute__((__no_sanitize__("unsigned-integer-overflow")))
#endif
#if __has_builtin(__builtin_launder)
#define _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
#endif
#if __has_builtin(__builtin_constant_p)
#define _LIBCPP_COMPILER_HAS_BUILTIN_CONSTANT_P
#endif
#if !__is_identifier(__has_unique_object_representations)
#define _LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS
#endif
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
// Literal operators ""d and ""y are supported starting with LLVM Clang 8 and AppleClang 10.0.1
#if (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 800) || \
(defined(__apple_build_version__) && __apple_build_version__ < 10010000)
#define _LIBCPP_HAS_NO_CXX20_CHRONO_LITERALS
#endif
#define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
#elif defined(_LIBCPP_COMPILER_GCC)
#define _ALIGNAS(x) __attribute__((__aligned__(x)))
#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
#define _LIBCPP_NORETURN __attribute__((noreturn))
#if !__EXCEPTIONS
# define _LIBCPP_NO_EXCEPTIONS
#endif
// Determine if GCC supports relaxed constexpr
#if !defined(__cpp_constexpr) || __cpp_constexpr < 201304L
#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR
#endif
// GCC 5 supports variable templates
#if !defined(__cpp_variable_templates) || __cpp_variable_templates < 201304L
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#endif
#if !defined(_LIBCPP_HAS_NO_ASAN) && !defined(__SANITIZE_ADDRESS__)
#define _LIBCPP_HAS_NO_ASAN
#endif
#if _GNUC_VER >= 700
#define _LIBCPP_COMPILER_HAS_BUILTIN_LAUNDER
#define _LIBCPP_COMPILER_HAS_BUILTIN_CONSTANT_P
#define _LIBCPP_HAS_UNIQUE_OBJECT_REPRESENTATIONS
#endif
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
#define _LIBCPP_DISABLE_EXTENSION_WARNING __extension__
#elif defined(_LIBCPP_COMPILER_MSVC)
#define _LIBCPP_TOSTRING2(x) #x
#define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
#define _LIBCPP_WARNING(x) __pragma(message(__FILE__ "(" _LIBCPP_TOSTRING(__LINE__) ") : warning note: " x))
#if _MSC_VER < 1900
#error "MSVC versions prior to Visual Studio 2015 are not supported"
#endif
#define _LIBCPP_HAS_NO_CXX14_CONSTEXPR
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#define __alignof__ __alignof
#define _LIBCPP_NORETURN __declspec(noreturn)
#define _ALIGNAS(x) __declspec(align(x))
#define _ALIGNAS_TYPE(x) alignas(x)
#define _LIBCPP_WEAK
#define _LIBCPP_HAS_NO_ASAN
#define _LIBCPP_ALWAYS_INLINE __forceinline
#define _LIBCPP_HAS_NO_VECTOR_EXTENSION
#define _LIBCPP_DISABLE_EXTENSION_WARNING
#elif defined(_LIBCPP_COMPILER_IBM)
#define _ALIGNAS(x) __attribute__((__aligned__(x)))
#define _ALIGNAS_TYPE(x) __attribute__((__aligned__(_LIBCPP_ALIGNOF(x))))
#define _ATTRIBUTE(x) __attribute__((x))
#define _LIBCPP_NORETURN __attribute__((noreturn))
#define _LIBCPP_HAS_NO_UNICODE_CHARS
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#if defined(_AIX)
#define __MULTILOCALE_API
#endif
#define _LIBCPP_HAS_NO_ASAN
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
#define _LIBCPP_HAS_NO_VECTOR_EXTENSION
#define _LIBCPP_DISABLE_EXTENSION_WARNING
#endif // _LIBCPP_COMPILER_[CLANG|GCC|MSVC|IBM]
2010-05-12 03:42:16 +08:00
#if defined(_LIBCPP_OBJECT_FORMAT_COFF)
#ifdef _DLL
# define _LIBCPP_CRT_FUNC __declspec(dllimport)
#else
# define _LIBCPP_CRT_FUNC
#endif
#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_DLL_VIS
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_EXPORTED_FROM_ABI
#elif defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_DLL_VIS __declspec(dllexport)
# if defined(__MINGW32__)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# else
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS
# endif
# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllexport)
#else
# define _LIBCPP_DLL_VIS __declspec(dllimport)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_EXPORTED_FROM_ABI __declspec(dllimport)
#endif
#define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS
#define _LIBCPP_FUNC_VIS _LIBCPP_DLL_VIS
#define _LIBCPP_EXCEPTION_ABI _LIBCPP_DLL_VIS
#define _LIBCPP_HIDDEN
[libc++] Make _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS export members When building libc++ with hidden visibility, we want explicit template instantiations to export members. This is consistent with existing Windows behavior, and is necessary for clients to be able to link against a hidden visibility built libc++ without running into lots of missing symbols. An unfortunate side effect, however, is that any template methods of a class with an explicit instantiation will get default visibility when instantiated, unless the methods are explicitly marked inline or hidden visibility. This is not desirable for clients of libc++ headers who wish to control their visibility, and led to PR30642. Annotate all problematic methods with an explicit visibility specifier to avoid this. The problematic methods were found by running https://github.com/smeenai/bad-visibility-finder against the libc++ headers after making the _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS change. The methods were marked with the new _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS macro, which was created for this purpose. It should be noted that _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS was originally intended to expand to default visibility, and was changed to expanding to default type visibility to fix PR30642. The visibility macro documentation was not updated accordingly, however, so this change makes the macro consistent with its documentation again, while explicitly fixing the methods which resulted in that PR. Differential Revision: https://reviews.llvm.org/D29157 llvm-svn: 296731
2017-03-02 11:02:50 +08:00
#define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
#define _LIBCPP_TEMPLATE_VIS
#define _LIBCPP_ENUM_VIS
#endif // defined(_LIBCPP_OBJECT_FORMAT_COFF)
#ifndef _LIBCPP_HIDDEN
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden")))
# else
# define _LIBCPP_HIDDEN
# endif
#endif
#ifndef _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
[libc++] Make _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS export members When building libc++ with hidden visibility, we want explicit template instantiations to export members. This is consistent with existing Windows behavior, and is necessary for clients to be able to link against a hidden visibility built libc++ without running into lots of missing symbols. An unfortunate side effect, however, is that any template methods of a class with an explicit instantiation will get default visibility when instantiated, unless the methods are explicitly marked inline or hidden visibility. This is not desirable for clients of libc++ headers who wish to control their visibility, and led to PR30642. Annotate all problematic methods with an explicit visibility specifier to avoid this. The problematic methods were found by running https://github.com/smeenai/bad-visibility-finder against the libc++ headers after making the _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS change. The methods were marked with the new _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS macro, which was created for this purpose. It should be noted that _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS was originally intended to expand to default visibility, and was changed to expanding to default type visibility to fix PR30642. The visibility macro documentation was not updated accordingly, however, so this change makes the macro consistent with its documentation again, while explicitly fixing the methods which resulted in that PR. Differential Revision: https://reviews.llvm.org/D29157 llvm-svn: 296731
2017-03-02 11:02:50 +08:00
// The inline should be removed once PR32114 is resolved
# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS inline _LIBCPP_HIDDEN
# else
# define _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS
# endif
#endif
[libc++] Make _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS export members When building libc++ with hidden visibility, we want explicit template instantiations to export members. This is consistent with existing Windows behavior, and is necessary for clients to be able to link against a hidden visibility built libc++ without running into lots of missing symbols. An unfortunate side effect, however, is that any template methods of a class with an explicit instantiation will get default visibility when instantiated, unless the methods are explicitly marked inline or hidden visibility. This is not desirable for clients of libc++ headers who wish to control their visibility, and led to PR30642. Annotate all problematic methods with an explicit visibility specifier to avoid this. The problematic methods were found by running https://github.com/smeenai/bad-visibility-finder against the libc++ headers after making the _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS change. The methods were marked with the new _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS macro, which was created for this purpose. It should be noted that _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS was originally intended to expand to default visibility, and was changed to expanding to default type visibility to fix PR30642. The visibility macro documentation was not updated accordingly, however, so this change makes the macro consistent with its documentation again, while explicitly fixing the methods which resulted in that PR. Differential Revision: https://reviews.llvm.org/D29157 llvm-svn: 296731
2017-03-02 11:02:50 +08:00
#ifndef _LIBCPP_FUNC_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_FUNC_VIS __attribute__ ((__visibility__("default")))
# else
# define _LIBCPP_FUNC_VIS
# endif
#endif
#ifndef _LIBCPP_TYPE_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
# else
# define _LIBCPP_TYPE_VIS
# endif
#endif
#ifndef _LIBCPP_TEMPLATE_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# if __has_attribute(__type_visibility__)
# define _LIBCPP_TEMPLATE_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_TEMPLATE_VIS __attribute__ ((__visibility__("default")))
# endif
# else
# define _LIBCPP_TEMPLATE_VIS
# endif
#endif
#ifndef _LIBCPP_EXPORTED_FROM_ABI
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_EXPORTED_FROM_ABI __attribute__((__visibility__("default")))
# else
# define _LIBCPP_EXPORTED_FROM_ABI
# endif
#endif
#ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS
#define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_FUNC_VIS
#endif
#ifndef _LIBCPP_EXCEPTION_ABI
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_EXCEPTION_ABI __attribute__ ((__visibility__("default")))
# else
# define _LIBCPP_EXCEPTION_ABI
# endif
#endif
#ifndef _LIBCPP_ENUM_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_ENUM_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_ENUM_VIS
# endif
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
[libc++] Make _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS export members When building libc++ with hidden visibility, we want explicit template instantiations to export members. This is consistent with existing Windows behavior, and is necessary for clients to be able to link against a hidden visibility built libc++ without running into lots of missing symbols. An unfortunate side effect, however, is that any template methods of a class with an explicit instantiation will get default visibility when instantiated, unless the methods are explicitly marked inline or hidden visibility. This is not desirable for clients of libc++ headers who wish to control their visibility, and led to PR30642. Annotate all problematic methods with an explicit visibility specifier to avoid this. The problematic methods were found by running https://github.com/smeenai/bad-visibility-finder against the libc++ headers after making the _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS change. The methods were marked with the new _LIBCPP_METHOD_TEMPLATE_IMPLICIT_INSTANTIATION_VIS macro, which was created for this purpose. It should be noted that _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS was originally intended to expand to default visibility, and was changed to expanding to default type visibility to fix PR30642. The visibility macro documentation was not updated accordingly, however, so this change makes the macro consistent with its documentation again, while explicitly fixing the methods which resulted in that PR. Differential Revision: https://reviews.llvm.org/D29157 llvm-svn: 296731
2017-03-02 11:02:50 +08:00
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __attribute__ ((__visibility__("default")))
# else
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# endif
#endif
#ifndef _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
#define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
#endif
#if __has_attribute(internal_linkage)
# define _LIBCPP_INTERNAL_LINKAGE __attribute__ ((internal_linkage))
#else
# define _LIBCPP_INTERNAL_LINKAGE _LIBCPP_ALWAYS_INLINE
#endif
#if __has_attribute(exclude_from_explicit_instantiation)
# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION __attribute__ ((__exclude_from_explicit_instantiation__))
#else
// Try to approximate the effect of exclude_from_explicit_instantiation
// (which is that entities are not assumed to be provided by explicit
// template instantiations in the dylib) by always inlining those entities.
# define _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION _LIBCPP_ALWAYS_INLINE
#endif
#ifndef _LIBCPP_HIDE_FROM_ABI_PER_TU
# ifndef _LIBCPP_HIDE_FROM_ABI_PER_TU_BY_DEFAULT
# define _LIBCPP_HIDE_FROM_ABI_PER_TU 0
# else
# define _LIBCPP_HIDE_FROM_ABI_PER_TU 1
# endif
#endif
#ifndef _LIBCPP_HIDE_FROM_ABI
# if _LIBCPP_HIDE_FROM_ABI_PER_TU
# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_INTERNAL_LINKAGE
# else
# define _LIBCPP_HIDE_FROM_ABI _LIBCPP_HIDDEN _LIBCPP_EXCLUDE_FROM_EXPLICIT_INSTANTIATION
# endif
#endif
#ifdef _LIBCPP_BUILDING_LIBRARY
# if _LIBCPP_ABI_VERSION > 1
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
# else
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1
# endif
#else
# define _LIBCPP_HIDE_FROM_ABI_AFTER_V1 _LIBCPP_HIDE_FROM_ABI
[libc++] Add _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY to support GCC ABI compatibility Summary: GCC and Clang handle visibility attributes on the out-of-line definition of externally instantiated templates differently. For example in the reproducer below Clang will emit both 'foo' and 'bar' with default visibility while GCC only emits a non-hidden 'foo'. ``` // RUN: g++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out // RUN: clang++ -std=c++11 -shared -O3 test.cpp && sym_extract.py a.out #define INLINE_VISIBILITY __attribute__((visibility("hidden"), always_inline)) template <class T> struct Foo { void foo(); void bar(); }; template <class T> void Foo<T>::foo() {} template <class T> inline INLINE_VISIBILITY void Foo<T>::bar() {} template struct Foo<int>; ``` This difference creates ABI incompatibilities between Clang and GCC built dylibs. Specifically GCC built dylibs lack definitions for various member functions of `basic_string`, `basic_istream`, `basic_ostream`, `basic_iostream`, and `basic_streambuf` (All of these types are externally instantiated). Surprisingly these missing symbols don't cause many problems because the functions are marked `always_inline` therefore the dylib definition is rarely needed. However when an out-of-line definition is required then GCC built dylibs will fail to link. For example [GCC built dylibs cannot build Clang](http://stackoverflow.com/questions/39454262/clang-build-errors). This patch works around this issue by adding `_LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY` which is used to mark externally instantiated member functions as always inline. When building the library `_LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY` sets the symbol's visibility to "default" instead of "hidden", otherwise it acts exactly the same as `_LIBCPP_INLINE_VISIBILITY`. After applying this patch GCC dylibs now contain: * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE7sungetcEv` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5gbumpEi` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE7sungetcEv` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE9sputbackcEc` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEE3getERNS_15basic_streambufIwS2_EE` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEElsEPFRNS_9basic_iosIwS2_EES6_E` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE4setpEPcS4_` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEEC1EPNS_15basic_streambufIwS2_EE` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE6snextcEv` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEE4swapERS3_` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEE4swapERS3_` * `_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcm` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEErsEPFRNS_8ios_baseES5_E` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE9pubsetbufEPcl` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE10pubseekoffExNS_8ios_base7seekdirEj` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEErsEPFRNS_9basic_iosIwS2_EES6_E` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5pbumpEi` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE5seekpENS_4fposI11__mbstate_tEE` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEE7getlineEPcl` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5sgetcEv` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEE3getERNS_15basic_streambufIcS2_EE` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEElsEPFRNS_8ios_baseES5_E` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE8in_availEv` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEErsEPFRNS_8ios_baseES5_E` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE6sbumpcEv` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEElsEPFRNS_9basic_iosIcS2_EES6_E` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEE3getERc` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE6snextcEv` * `_ZNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE6__initEmw` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEE7getlineEPwl` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE5tellpEv` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEE3getERw` * `_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEmc` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE7pubsyncEv` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEE3getEPcl` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEEC2EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEErsEPFRNS_9basic_iosIcS2_EES6_E` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE7pubsyncEv` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5sputcEc` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEE5seekpExNS_8ios_base7seekdirE` * `_ZNKSt3__115basic_streambufIcNS_11char_traitsIcEEE6getlocEv` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5gbumpEi` * `_ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEE4swapERS3_` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEE5seekpENS_4fposI11__mbstate_tEE` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEE5tellpEv` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEElsEPFRS3_S4_E` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEE3getEPwl` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEEC2EPNS_15basic_streambufIwS2_EE` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEElsEPFRS3_S4_E` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE4setgEPcS4_S4_` * `_ZNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE6__initEPKwmm` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE4setgEPwS4_S4_` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEEC1EPNS_15basic_streambufIwS2_EE` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE8pubimbueERKNS_6localeE` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE4swapERS3_` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEEC2EPNS_15basic_streambufIwS2_EE` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE10pubseekposENS_4fposI11__mbstate_tEEj` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5pbumpEi` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5sgetcEv` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEE4swapERS3_` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE10pubseekposENS_4fposI11__mbstate_tEEj` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5sputnEPKcl` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEE5seekpExNS_8ios_base7seekdirE` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5sgetnEPwl` * `_ZNSt3__113basic_ostreamIwNS_11char_traitsIwEEElsEPFRNS_8ios_baseES5_E` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE4setpEPwS4_` * `_ZNSt3__115basic_streambufIcNS_11char_traitsIcEEE5sgetnEPcl` * `_ZNKSt3__115basic_streambufIwNS_11char_traitsIwEEE6getlocEv` * `_ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEEC2EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE8pubimbueERKNS_6localeE` * `_ZNSt3__114basic_iostreamIcNS_11char_traitsIcEEEC1EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE8in_availEv` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEEC1EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEE6__initEPKcmm` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE6sbumpcEv` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE10pubseekoffExNS_8ios_base7seekdirEj` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEEC2EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__113basic_istreamIwNS_11char_traitsIwEEErsEPFRS3_S4_E` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE9sputbackcEw` * `_ZNSt3__112basic_stringIwNS_11char_traitsIwEENS_9allocatorIwEEE6__initEPKwm` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5sputnEPKwl` * `_ZNSt3__113basic_istreamIcNS_11char_traitsIcEEErsEPFRS3_S4_E` * `_ZNSt3__113basic_ostreamIcNS_11char_traitsIcEEEC1EPNS_15basic_streambufIcS2_EE` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE9pubsetbufEPwl` * `_ZNSt3__115basic_streambufIwNS_11char_traitsIwEEE5sputcEw` This patch has no effect on Clang based builds. Reviewers: mclow.lists, eugenis, danalbert, jroelofs, EricWF Subscribers: beanz, cfe-commits, mgorny Differential Revision: https://reviews.llvm.org/D24600 llvm-svn: 281681
2016-09-16 08:00:48 +08:00
#endif
// Just so we can migrate to the new macros gradually.
#define _LIBCPP_INLINE_VISIBILITY _LIBCPP_HIDE_FROM_ABI
// Inline namespaces are available in Clang/GCC/MSVC regardless of C++ dialect.
#define _LIBCPP_BEGIN_NAMESPACE_STD namespace std { inline namespace _LIBCPP_ABI_NAMESPACE {
#define _LIBCPP_END_NAMESPACE_STD } }
#define _VSTD std::_LIBCPP_ABI_NAMESPACE
_LIBCPP_BEGIN_NAMESPACE_STD _LIBCPP_END_NAMESPACE_STD
#if _LIBCPP_STD_VER >= 17
#define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \
_LIBCPP_BEGIN_NAMESPACE_STD inline namespace __fs { namespace filesystem {
#else
#define _LIBCPP_BEGIN_NAMESPACE_FILESYSTEM \
_LIBCPP_BEGIN_NAMESPACE_STD namespace __fs { namespace filesystem {
#endif
#define _LIBCPP_END_NAMESPACE_FILESYSTEM \
_LIBCPP_END_NAMESPACE_STD } }
#define _VSTD_FS _VSTD::__fs::filesystem
#ifndef _LIBCPP_PREFERRED_OVERLOAD
# if __has_attribute(__enable_if__)
# define _LIBCPP_PREFERRED_OVERLOAD __attribute__ ((__enable_if__(true, "")))
# endif
#endif
#ifndef _LIBCPP_HAS_NO_NOEXCEPT
# define _NOEXCEPT noexcept
# define _NOEXCEPT_(x) noexcept(x)
#else
# define _NOEXCEPT throw()
# define _NOEXCEPT_(x)
#endif
2010-05-12 03:42:16 +08:00
#ifdef _LIBCPP_HAS_NO_UNICODE_CHARS
typedef unsigned short char16_t;
typedef unsigned int char32_t;
#endif // _LIBCPP_HAS_NO_UNICODE_CHARS
2010-05-12 03:42:16 +08:00
#ifndef __SIZEOF_INT128__
#define _LIBCPP_HAS_NO_INT128
#endif
#ifdef _LIBCPP_CXX03_LANG
# define static_assert(...) _Static_assert(__VA_ARGS__)
# define decltype(...) __decltype(__VA_ARGS__)
#endif // _LIBCPP_CXX03_LANG
2010-05-12 03:42:16 +08:00
#ifdef _LIBCPP_CXX03_LANG
# define _LIBCPP_CONSTEXPR
#else
# define _LIBCPP_CONSTEXPR constexpr
#endif
#ifndef __cpp_consteval
# define _LIBCPP_CONSTEVAL _LIBCPP_CONSTEXPR
#else
# define _LIBCPP_CONSTEVAL consteval
#endif
#ifdef _LIBCPP_CXX03_LANG
# define _LIBCPP_DEFAULT {}
#else
# define _LIBCPP_DEFAULT = default;
#endif
#ifdef _LIBCPP_CXX03_LANG
Teach __tree how to handle map's __value_type This patch is fairly large and contains a number of changes. The changes all work towards allowing __tree to properly handle __value_type esspecially when inserting into the __tree. I chose not to break this change into smaller patches because it wouldn't be possible to write meaningful standard-compliant tests for each patch. It is very similar to r260513 "[libcxx] Teach __hash_table how to handle unordered_map's __hash_value_type". Changes in <map> * Remove __value_type's constructors because it should never be constructed directly. * Make map::emplace and multimap::emplace forward to __tree and remove the old definitions * Remove "__construct_node" map and multimap member functions. Almost all of the construction is done within __tree. * Fix map's move constructor to access "__value_type.__nc" directly and pass this object to __tree::insert. Changes in <__tree> * Add traits to detect, handle, and unwrap, map's "__value_type". * Convert methods taking "value_type" to take "__container_value_type" instead. Previously these methods caused unwanted implicit conversions from "std::pair<Key, Value>" to "__value_type<Key, Value>". * Delete __tree_node and __tree_node_base's constructors and assignment operators. The node types should never be constructed because the "__value_" member of __tree_node must be constructed directly by the allocator. * Make the __tree_node_destructor class and "__construct_node" methods unwrap "__node_value_type" into "__container_value_type" before invoking the allocator. The user's allocator can only be used to construct and destroy the container's value_type. Passing it map's "__value_type" was incorrect. * Cleanup the "__insert" and "__emplace" methods. Have __insert forward to an __emplace function wherever possible to reduce code duplication. __insert_unique(value_type const&) and __insert_unique(value_type&&) forward to __emplace_unique_key_args. These functions will not allocate a new node if the value is already in the tree. * Change the __find* functions to take the "key_type" directly instead of passing in "value_type" and unwrapping the key later. This change allows the find functions to be used without having to construct a "value_type" first. This allows for a number of optimizations. * Teach __move_assign and __assign_multi methods to unwrap map's __value_type. llvm-svn: 264986
2016-03-31 10:15:15 +08:00
# define _LIBCPP_EQUAL_DELETE
#else
# define _LIBCPP_EQUAL_DELETE = delete
#endif
#ifdef __GNUC__
# define _LIBCPP_NOALIAS __attribute__((__malloc__))
#else
# define _LIBCPP_NOALIAS
#endif
#if __has_feature(cxx_explicit_conversions) || defined(__IBMCPP__) || \
(!defined(_LIBCPP_CXX03_LANG) && defined(__GNUC__)) // All supported GCC versions
# define _LIBCPP_EXPLICIT explicit
#else
# define _LIBCPP_EXPLICIT
#endif
#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
# define _LIBCPP_DECLARE_STRONG_ENUM(x) struct _LIBCPP_TYPE_VIS x { enum __lx
# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \
__lx __v_; \
_LIBCPP_INLINE_VISIBILITY x(__lx __v) : __v_(__v) {} \
_LIBCPP_INLINE_VISIBILITY explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
_LIBCPP_INLINE_VISIBILITY operator int() const {return __v_;} \
};
#else // _LIBCPP_HAS_NO_STRONG_ENUMS
# define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_ENUM_VIS x
# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
#endif // _LIBCPP_HAS_NO_STRONG_ENUMS
// _LIBCPP_DEBUG potential values:
// - undefined: No assertions. This is the default.
// - 0: Basic assertions
// - 1: Basic assertions + iterator validity checks.
#if !defined(_LIBCPP_DEBUG)
# define _LIBCPP_DEBUG_LEVEL 0
#elif _LIBCPP_DEBUG == 0
# define _LIBCPP_DEBUG_LEVEL 1
#elif _LIBCPP_DEBUG == 1
# define _LIBCPP_DEBUG_LEVEL 2
#else
# error Supported values for _LIBCPP_DEBUG are 0 and 1
#endif
// _LIBCPP_DEBUG_LEVEL is always defined to one of [0, 1, 2] at this point
#if _LIBCPP_DEBUG_LEVEL >= 1
# define _LIBCPP_DISABLE_EXTERN_TEMPLATE
#endif
#ifdef _LIBCPP_DISABLE_EXTERN_TEMPLATE
#define _LIBCPP_EXTERN_TEMPLATE(...)
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE
#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_DEFINE
#define _LIBCPP_EXTERN_TEMPLATE_DEFINE(...) template __VA_ARGS__;
#endif
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_LIBCPP_MSVCRT_LIKE) || \
defined(__sun__) || defined(__NetBSD__) || defined(__CloudABI__)
#define _LIBCPP_LOCALE__L_EXTENSIONS 1
#endif
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
// Most unix variants have catopen. These are the specific ones that don't.
# if !defined(__BIONIC__) && !defined(_NEWLIB_VERSION)
# define _LIBCPP_HAS_CATOPEN 1
# endif
#endif
#ifdef __FreeBSD__
#define _DECLARE_C99_LDBL_MATH 1
#endif
// If we are getting operator new from the MSVC CRT, then allocation overloads
// for align_val_t were added in 19.12, aka VS 2017 version 15.3.
#if defined(_LIBCPP_MSVCRT) && defined(_MSC_VER) && _MSC_VER < 1912
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#elif defined(_LIBCPP_ABI_VCRUNTIME) && !defined(__cpp_aligned_new)
// We're deferring to Microsoft's STL to provide aligned new et al. We don't
[libc++] Don't define operator new/delete when using vcruntime Fixes build errors on Windows without libc++abi of the form: new(173,36): error: redeclaration of 'operator delete' cannot add 'dllexport' attribute _LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT; vcruntime_new.h(87,16): note: previous declaration is here void __CRTDECL operator delete( new(205,70): error: redefinition of 'operator new' _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new (std::size_t, void* __p) _NOEXCEPT {return __p;} vcruntime_new.h(184,28): note: previous definition is here inline void* __CRTDECL operator new(size_t _Size, _Writable_bytes_(_Size) void* _Where) noexcept new(206,70): error: redefinition of 'operator new[]' _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator new[](std::size_t, void* __p) _NOEXCEPT {return __p;} vcruntime_new.h(199,28): note: previous definition is here inline void* __CRTDECL operator new[](size_t _Size, new(207,40): error: redefinition of 'operator delete' inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {} vcruntime_new.h(190,27): note: previous definition is here inline void __CRTDECL operator delete(void*, void*) noexcept new(208,40): error: redefinition of 'operator delete[]' inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {} vcruntime_new.h(206,27): note: previous definition is here inline void __CRTDECL operator delete[](void*, void*) noexcept Differential Revision: https://reviews.llvm.org/D57362 llvm-svn: 352647
2019-01-31 03:08:32 +08:00
// have it unless the language feature test macro is defined.
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#elif defined(__MVS__)
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#endif
#if defined(__APPLE__)
# if !defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)
# define __MAC_OS_X_VERSION_MIN_REQUIRED __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
# endif
#endif // defined(__APPLE__)
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \
(defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || \
(!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606))
# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
#endif
#if defined(__APPLE__) || defined(__FreeBSD__)
#define _LIBCPP_HAS_DEFAULTRUNELOCALE
#endif
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)
#define _LIBCPP_WCTYPE_IS_MASK
#endif
#if _LIBCPP_STD_VER <= 17 || !defined(__cpp_char8_t)
#define _LIBCPP_NO_HAS_CHAR8_T
#endif
// Deprecation macros.
//
// Deprecations warnings are always enabled, except when users explicitly opt-out
// by defining _LIBCPP_DISABLE_DEPRECATION_WARNINGS.
#if !defined(_LIBCPP_DISABLE_DEPRECATION_WARNINGS)
# if __has_attribute(deprecated)
# define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
# elif _LIBCPP_STD_VER > 11
# define _LIBCPP_DEPRECATED [[deprecated]]
# else
# define _LIBCPP_DEPRECATED
# endif
#else
# define _LIBCPP_DEPRECATED
#endif
#if !defined(_LIBCPP_CXX03_LANG)
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
#else
# define _LIBCPP_DEPRECATED_IN_CXX11
#endif
#if _LIBCPP_STD_VER >= 14
# define _LIBCPP_DEPRECATED_IN_CXX14 _LIBCPP_DEPRECATED
#else
# define _LIBCPP_DEPRECATED_IN_CXX14
#endif
#if _LIBCPP_STD_VER >= 17
# define _LIBCPP_DEPRECATED_IN_CXX17 _LIBCPP_DEPRECATED
#else
# define _LIBCPP_DEPRECATED_IN_CXX17
#endif
#if _LIBCPP_STD_VER > 17
# define _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_DEPRECATED
#else
# define _LIBCPP_DEPRECATED_IN_CXX20
#endif
#if !defined(_LIBCPP_NO_HAS_CHAR8_T)
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T _LIBCPP_DEPRECATED
#else
# define _LIBCPP_DEPRECATED_WITH_CHAR8_T
#endif
// Macros to enter and leave a state where deprecation warnings are suppressed.
#if !defined(_LIBCPP_SUPPRESS_DEPRECATED_PUSH) && \
(defined(_LIBCPP_COMPILER_CLANG) || defined(_LIBCPP_COMPILER_GCC))
# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH \
_Pragma("GCC diagnostic push") \
_Pragma("GCC diagnostic ignored \"-Wdeprecated\"")
# define _LIBCPP_SUPPRESS_DEPRECATED_POP \
_Pragma("GCC diagnostic pop")
#endif
#if !defined(_LIBCPP_SUPPRESS_DEPRECATED_PUSH)
# define _LIBCPP_SUPPRESS_DEPRECATED_PUSH
# define _LIBCPP_SUPPRESS_DEPRECATED_POP
#endif
#if _LIBCPP_STD_VER <= 11
# define _LIBCPP_EXPLICIT_AFTER_CXX11
#else
# define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit
#endif
#if _LIBCPP_STD_VER > 11 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR)
# define _LIBCPP_CONSTEXPR_AFTER_CXX11 constexpr
#else
# define _LIBCPP_CONSTEXPR_AFTER_CXX11
#endif
#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR)
# define _LIBCPP_CONSTEXPR_AFTER_CXX14 constexpr
#else
# define _LIBCPP_CONSTEXPR_AFTER_CXX14
#endif
#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR)
# define _LIBCPP_CONSTEXPR_AFTER_CXX17 constexpr
#else
# define _LIBCPP_CONSTEXPR_AFTER_CXX17
#endif
[libc++] Add _LIBCPP_ENABLE_NODISCARD and _LIBCPP_NODISCARD_EXT to allow pre-C++2a [[nodiscard]] Summary: The `[[nodiscard]]` attribute is intended to help users find bugs where function return values are ignored when they shouldn't be. After C++17 the C++ standard has started to declared such library functions as `[[nodiscard]]`. However, this application is limited and applies only to dialects after C++17. Users who want help diagnosing misuses of STL functions may desire a more liberal application of `[[nodiscard]]`. For this reason libc++ provides an extension that does just that! The extension must be enabled by defining `_LIBCPP_ENABLE_NODISCARD`. The extended applications of `[[nodiscard]]` takes two forms: 1. Backporting `[[nodiscard]]` to entities declared as such by the standard in newer dialects, but not in the present one. 2. Extended applications of `[[nodiscard]]`, at the libraries discretion, applied to entities never declared as such by the standard. Users may also opt-out of additional applications `[[nodiscard]]` using additional macros. Applications of the first form, which backport `[[nodiscard]]` from a newer dialect may be disabled using macros specific to the dialect it was added. For example `_LIBCPP_DISABLE_NODISCARD_AFTER_CXX17`. Applications of the second form, which are pure extensions, may be disabled by defining `_LIBCPP_DISABLE_NODISCARD_EXT`. This patch was originally written by me (Roman Lebedev), then but then reworked by Eric Fiselier. Reviewers: mclow.lists, thakis, EricWF Reviewed By: thakis, EricWF Subscribers: llvm-commits, mclow.lists, lebedev.ri, EricWF, rjmccall, Quuxplusone, cfe-commits, christof Differential Revision: https://reviews.llvm.org/D45179 llvm-svn: 342808
2018-09-23 01:54:48 +08:00
// The _LIBCPP_NODISCARD_ATTRIBUTE should only be used to define other
// NODISCARD macros to the correct attribute.
#if __has_cpp_attribute(nodiscard) || defined(_LIBCPP_COMPILER_MSVC)
# define _LIBCPP_NODISCARD_ATTRIBUTE [[nodiscard]]
#elif defined(_LIBCPP_COMPILER_CLANG) && !defined(_LIBCPP_CXX03_LANG)
# define _LIBCPP_NODISCARD_ATTRIBUTE [[clang::warn_unused_result]]
#else
// We can't use GCC's [[gnu::warn_unused_result]] and
// __attribute__((warn_unused_result)), because GCC does not silence them via
// (void) cast.
# define _LIBCPP_NODISCARD_ATTRIBUTE
#endif
// _LIBCPP_NODISCARD_EXT may be used to apply [[nodiscard]] to entities not
// specified as such as an extension.
#if defined(_LIBCPP_ENABLE_NODISCARD) && !defined(_LIBCPP_DISABLE_NODISCARD_EXT)
# define _LIBCPP_NODISCARD_EXT _LIBCPP_NODISCARD_ATTRIBUTE
#else
# define _LIBCPP_NODISCARD_EXT
#endif
#if !defined(_LIBCPP_DISABLE_NODISCARD_AFTER_CXX17) && \
(_LIBCPP_STD_VER > 17 || defined(_LIBCPP_ENABLE_NODISCARD))
# define _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_NODISCARD_ATTRIBUTE
#else
# define _LIBCPP_NODISCARD_AFTER_CXX17
#endif
#if _LIBCPP_STD_VER > 14 && defined(__cpp_inline_variables) && (__cpp_inline_variables >= 201606L)
# define _LIBCPP_INLINE_VAR inline
#else
# define _LIBCPP_INLINE_VAR
#endif
#ifndef _LIBCPP_CONSTEXPR_IF_NODEBUG
#if defined(_LIBCPP_DEBUG) || defined(_LIBCPP_HAS_NO_CXX14_CONSTEXPR)
#define _LIBCPP_CONSTEXPR_IF_NODEBUG
#else
#define _LIBCPP_CONSTEXPR_IF_NODEBUG constexpr
#endif
#endif
#if __has_attribute(no_destroy)
# define _LIBCPP_NO_DESTROY __attribute__((__no_destroy__))
#else
# define _LIBCPP_NO_DESTROY
#endif
#ifndef _LIBCPP_HAS_NO_ASAN
extern "C" _LIBCPP_FUNC_VIS void __sanitizer_annotate_contiguous_container(
const void *, const void *, const void *, const void *);
#endif
// Try to find out if RTTI is disabled.
#if defined(_LIBCPP_COMPILER_CLANG) && !__has_feature(cxx_rtti)
# define _LIBCPP_NO_RTTI
#elif defined(__GNUC__) && !defined(__GXX_RTTI)
# define _LIBCPP_NO_RTTI
#elif defined(_LIBCPP_COMPILER_MSVC) && !defined(_CPPRTTI)
# define _LIBCPP_NO_RTTI
#endif
G M: The attached patch is for libcxx's new.cpp and __config files. The patch's intent is to make new.cpp compile using MS's cl.exe compiler without changing the meaning of anything for any other compiler. The issue this patch seeks to address is that MS's compiler (cl.exe) doesn't support the __attribute__((__weak__)) or __atribute__((__visibility__("default")) syntax; so a solution must be found where cl.exe doesn't see this syntax. This patch seeks to solve this problem by changing code patterned like this: __attribute__((__weak__, __visibility__("default"))) void* operator new(size_t size, const std::nothrow_t&) _NOEXCEPT { /*snip*/; return p; } to code like this: _LIBCPP_WEAK void* operator new(size_t size, const std::nothrow_t&) _NOEXCEPT { return p; } Howard: Thanks for all the comments regarding the default visibility tag on the definition. I agree it isn't needed, and that there are lots of other places where it is missing. That being said, I'm not wanting to rock the boat on that issue right now. So I've added it back to the definition via _LIBCPP_FUNC_VIS. A later pass dedicated just to this issue can bring things in to a consistent state one way or the other. Note that we do not want to have the exact same attributes on the declaration and defintion in this case. The declaration should not be marked weak, whereas the definition should (which is what G M's patch did). I've fully tested on OS X to ensure that the resultant attribute syntax actually works. llvm-svn: 192007
2013-10-05 07:56:37 +08:00
#ifndef _LIBCPP_WEAK
#define _LIBCPP_WEAK __attribute__((__weak__))
#endif
// Thread API
#if !defined(_LIBCPP_HAS_NO_THREADS) && \
!defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && \
!defined(_LIBCPP_HAS_THREAD_API_WIN32) && \
!defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
# if defined(__FreeBSD__) || \
defined(__wasi__) || \
defined(__NetBSD__) || \
defined(__NuttX__) || \
defined(__linux__) || \
defined(__GNU__) || \
defined(__APPLE__) || \
defined(__CloudABI__) || \
defined(__sun__) || \
defined(__MVS__) || \
(defined(__MINGW32__) && __has_include(<pthread.h>))
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# elif defined(__Fuchsia__)
// TODO(44575): Switch to C11 thread API when possible.
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# elif defined(_LIBCPP_WIN32API)
# define _LIBCPP_HAS_THREAD_API_WIN32
# else
# error "No thread API"
# endif // _LIBCPP_HAS_THREAD_API
#endif // _LIBCPP_HAS_NO_THREADS
#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
#if defined(__ANDROID__) && __ANDROID_API__ >= 30
#define _LIBCPP_HAS_COND_CLOCKWAIT
#elif defined(_LIBCPP_GLIBC_PREREQ)
#if _LIBCPP_GLIBC_PREREQ(2, 30)
#define _LIBCPP_HAS_COND_CLOCKWAIT
#endif
#endif
#endif
#if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
#error _LIBCPP_HAS_THREAD_API_PTHREAD may only be defined when \
_LIBCPP_HAS_NO_THREADS is not defined.
#endif
[libcxx] Introduce an externally-threaded libc++ variant. This patch further decouples libc++ from pthread, allowing libc++ to be built against other threading systems. There are two main use cases: - Building libc++ against a thread library other than pthreads. - Building libc++ with an "external" thread API, allowing a separate library to provide the implementation of that API. The two use cases are quite similar, the second one being sligtly more de-coupled than the first. The cmake option LIBCXX_HAS_EXTERNAL_THREAD_API enables both kinds of builds. One needs to place an <__external_threading> header file containing an implementation of the "libc++ thread API" declared in the <__threading_support> header. For the second use case, the implementation of the libc++ thread API can delegate to a custom "external" thread API where the implementation of this external API is provided in a seperate library. This mechanism allows toolchain vendors to distribute a build of libc++ with a custom thread-porting-layer API (which is the "external" API above), platform vendors (recipients of the toolchain/libc++) are then required to provide their implementation of this API to be linked with (end-user) C++ programs. Note that the second use case still requires establishing the basic types that get passed between the external thread library and the libc++ library (e.g. __libcpp_mutex_t). These cannot be opaque pointer types (libc++ sources won't compile otherwise). It should also be noted that the second use case can have a slight performance penalty; as all the thread constructs need to cross a library boundary through an additional function call. When the header <__external_threading> is omitted, libc++ is built with the "libc++ thread API" (declared in <__threading_support>) as the "external" thread API (basic types are pthread based). An implementation (pthread based) of this API is provided in test/support/external_threads.cpp, which is built into a separate DSO and linked in when running the libc++ test suite. A test run therefore demonstrates the second use case (less the intermediate custom API). Differential revision: https://reviews.llvm.org/D21968 Reviewers: bcraig, compnerd, EricWF, mclow.lists llvm-svn: 281179
2016-09-12 05:46:40 +08:00
#if defined(_LIBCPP_HAS_NO_THREADS) && defined(_LIBCPP_HAS_THREAD_API_EXTERNAL)
#error _LIBCPP_HAS_THREAD_API_EXTERNAL may not be defined when \
[libcxx] Introduce an externally-threaded libc++ variant. This patch further decouples libc++ from pthread, allowing libc++ to be built against other threading systems. There are two main use cases: - Building libc++ against a thread library other than pthreads. - Building libc++ with an "external" thread API, allowing a separate library to provide the implementation of that API. The two use cases are quite similar, the second one being sligtly more de-coupled than the first. The cmake option LIBCXX_HAS_EXTERNAL_THREAD_API enables both kinds of builds. One needs to place an <__external_threading> header file containing an implementation of the "libc++ thread API" declared in the <__threading_support> header. For the second use case, the implementation of the libc++ thread API can delegate to a custom "external" thread API where the implementation of this external API is provided in a seperate library. This mechanism allows toolchain vendors to distribute a build of libc++ with a custom thread-porting-layer API (which is the "external" API above), platform vendors (recipients of the toolchain/libc++) are then required to provide their implementation of this API to be linked with (end-user) C++ programs. Note that the second use case still requires establishing the basic types that get passed between the external thread library and the libc++ library (e.g. __libcpp_mutex_t). These cannot be opaque pointer types (libc++ sources won't compile otherwise). It should also be noted that the second use case can have a slight performance penalty; as all the thread constructs need to cross a library boundary through an additional function call. When the header <__external_threading> is omitted, libc++ is built with the "libc++ thread API" (declared in <__threading_support>) as the "external" thread API (basic types are pthread based). An implementation (pthread based) of this API is provided in test/support/external_threads.cpp, which is built into a separate DSO and linked in when running the libc++ test suite. A test run therefore demonstrates the second use case (less the intermediate custom API). Differential revision: https://reviews.llvm.org/D21968 Reviewers: bcraig, compnerd, EricWF, mclow.lists llvm-svn: 281179
2016-09-12 05:46:40 +08:00
_LIBCPP_HAS_NO_THREADS is defined.
#endif
#if defined(_LIBCPP_HAS_NO_MONOTONIC_CLOCK) && !defined(_LIBCPP_HAS_NO_THREADS)
#error _LIBCPP_HAS_NO_MONOTONIC_CLOCK may only be defined when \
_LIBCPP_HAS_NO_THREADS is defined.
#endif
#if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(__STDCPP_THREADS__)
#define __STDCPP_THREADS__ 1
#endif
// The glibc and Bionic implementation of pthreads implements
// pthread_mutex_destroy as nop for regular mutexes. Additionally, Win32
// mutexes have no destroy mechanism.
//
// This optimization can't be performed on Apple platforms, where
// pthread_mutex_destroy can allow the kernel to release resources.
// See https://llvm.org/D64298 for details.
//
// TODO(EricWF): Enable this optimization on Bionic after speaking to their
// respective stakeholders.
#if (defined(_LIBCPP_HAS_THREAD_API_PTHREAD) && defined(__GLIBC__)) \
|| (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) \
|| defined(_LIBCPP_HAS_THREAD_API_WIN32)
# define _LIBCPP_HAS_TRIVIAL_MUTEX_DESTRUCTION
#endif
// Destroying a condvar is a nop on Windows.
//
// This optimization can't be performed on Apple platforms, where
// pthread_cond_destroy can allow the kernel to release resources.
// See https://llvm.org/D64298 for details.
//
// TODO(EricWF): This is potentially true for some pthread implementations
// as well.
#if (defined(_LIBCPP_HAS_THREAD_API_C11) && defined(__Fuchsia__)) || \
defined(_LIBCPP_HAS_THREAD_API_WIN32)
# define _LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
#endif
// Systems that use capability-based security (FreeBSD with Capsicum,
// Nuxi CloudABI) may only provide local filesystem access (using *at()).
// Functions like open(), rename(), unlink() and stat() should not be
// used, as they attempt to access the global filesystem namespace.
#ifdef __CloudABI__
#define _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
#endif
// CloudABI is intended for running networked services. Processes do not
// have standard input and output channels.
#ifdef __CloudABI__
#define _LIBCPP_HAS_NO_STDIN
#define _LIBCPP_HAS_NO_STDOUT
#endif
// Some systems do not provide gets() in their C library, for security reasons.
#ifndef _LIBCPP_C_HAS_NO_GETS
# if defined(_LIBCPP_MSVCRT) || \
(defined(__FreeBSD_version) && __FreeBSD_version >= 1300043)
# define _LIBCPP_C_HAS_NO_GETS
# endif
#endif
#if defined(__BIONIC__) || defined(__CloudABI__) || defined(__NuttX__) || \
defined(__Fuchsia__) || defined(__wasi__) || defined(_LIBCPP_HAS_MUSL_LIBC) || \
defined(__MVS__)
#define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
#endif
// Thread-unsafe functions such as strtok() and localtime()
// are not available.
#ifdef __CloudABI__
#define _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
#endif
#if __has_feature(cxx_atomic) || __has_extension(c_atomic) || __has_keyword(_Atomic)
# define _LIBCPP_HAS_C_ATOMIC_IMP
#elif defined(_LIBCPP_COMPILER_GCC)
# define _LIBCPP_HAS_GCC_ATOMIC_IMP
#endif
#if (!defined(_LIBCPP_HAS_C_ATOMIC_IMP) && \
!defined(_LIBCPP_HAS_GCC_ATOMIC_IMP) && \
!defined(_LIBCPP_HAS_EXTERNAL_ATOMIC_IMP)) \
|| defined(_LIBCPP_HAS_NO_THREADS)
# define _LIBCPP_HAS_NO_ATOMIC_HEADER
#else
# ifndef _LIBCPP_ATOMIC_FLAG_TYPE
# define _LIBCPP_ATOMIC_FLAG_TYPE bool
# endif
# ifdef _LIBCPP_FREESTANDING
# define _LIBCPP_ATOMIC_ONLY_USE_BUILTINS
# endif
#endif
#ifndef _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
#define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
Teach __hash_table how to handle unordered_map's __hash_value_type. This patch is fairly large and contains a number of changes. The main change is teaching '__hash_table' how to handle '__hash_value_type'. Unfortunately this change is a rampant layering violation, but it's required to make unordered_map conforming without re-writing all of __hash_table. After this change 'unordered_map' can delegate to '__hash_table' in almost all cases. The major changes found in this patch are: * Teach __hash_table to differentiate between the true container value type and the node value type by introducing the "__container_value_type" and "__node_value_type" typedefs. In the case of unordered_map '__container_value_type' is 'pair<const Key, Value>' and '__node_value_type' is '__hash_value_type'. * Switch almost all overloads in '__hash_table' previously taking 'value_type' (AKA '__node_value_type) to take '__container_value_type' instead. Previously 'pair<K, V>' would be implicitly converted to '__hash_value_type<K, V>' because of the function signature. * Add '__get_key', '__get_value', '__get_ptr', and '__move' static functions to '__key_value_types'. These functions allow '__hash_table' to unwrap '__node_value_type' objects into '__container_value_type' and its sub-parts. * Pass '__hash_value_type::__value_' to 'a.construct(p, ...)' instead of '__hash_value_type' itself. The C++14 standard requires that 'a.construct()' and 'a.destroy()' are only ever instantiated for the containers value type. * Remove '__hash_value_type's constructors and destructors. We should never construct an instance of this type. (TODO this is UB but we already do it in plenty of places). * Add a generic "try-emplace" function to '__hash_table' called '__emplace_unique_key_args(Key const&, Args...)'. The following changes were done as cleanup: * Introduce the '_LIBCPP_CXX03_LANG' macro to be used in place of '_LIBCPP_HAS_NO_VARIADICS' or '_LIBCPP_HAS_NO_RVALUE_REFERENCE'. * Cleanup C++11 only overloads that assume an incomplete C++11 implementation. For example this patch removes the __construct_node overloads that do manual pack expansion. * Forward 'unordered_map::emplace' to '__hash_table' and remove dead code resulting from the change. This includes almost all 'unordered_map::__construct_node' overloads. The following changes are planed for future revisions: * Fix LWG issue #2469 by delegating 'unordered_map::operator[]' to use '__emplace_unique_key_args'. * Rewrite 'unordered_map::try_emplace' in terms of '__emplace_unique_key_args'. * Optimize '__emplace_unique' to call '__emplace_unique_key_args' when possible. This prevent unneeded allocations when inserting duplicate entries. The additional follow up work needed after this patch: * Respect the lifetime rules for '__hash_value_type' by actually constructing it. * Make '__insert_multi' act similar to '__insert_unique' for objects of type 'T&' and 'T const &&' with 'T = __container_value_type'. llvm-svn: 260513
2016-02-11 19:59:44 +08:00
#endif
#if defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS)
# if defined(__clang__) && __has_attribute(acquire_capability)
// Work around the attribute handling in clang. When both __declspec and
// __attribute__ are present, the processing goes awry preventing the definition
// of the types.
# if !defined(_LIBCPP_OBJECT_FORMAT_COFF)
# define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
# endif
# endif
#endif
#ifndef _LIBCPP_THREAD_SAFETY_ANNOTATION
# ifdef _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x) __attribute__((x))
# else
# define _LIBCPP_THREAD_SAFETY_ANNOTATION(x)
# endif
#endif // _LIBCPP_THREAD_SAFETY_ANNOTATION
#if __has_attribute(require_constant_initialization)
# define _LIBCPP_SAFE_STATIC __attribute__((__require_constant_initialization__))
#else
# define _LIBCPP_SAFE_STATIC
#endif
Implement N4606 optional Summary: Adapt implementation of Library Fundamentals TS optional into an implementation of N4606 optional. - Update relational operators per http://wg21.link/P0307 - Update to requirements of http://wg21.link/P0032 - Extension: Implement trivial copy/move construction/assignment for `optional<T>` when `T` is trivially copyable. Audit P/Rs for optional LWG issues: - 2756 "C++ WP optional<T> should 'forward' T's implicit conversions" Implemented, which also resolves 2753 "Optional's constructors and assignments need constraints" (modulo my refusal to explicitly delete the move operations, which is a design error that I'm working on correcting in the 2756 P/R). - 2736 "nullopt_t insufficiently constrained" Already conforming. I've added a test ensuring that `nullopt_t` is not copy-initializable from an empty braced-init-list, which I believe is the root intent of the issue, to avoid regression. - 2740 "constexpr optional<T>::operator->" Already conforming. - 2746 "Inconsistency between requirements for emplace between optional and variant" No P/R, but note that the author's '"suggested resolution" is already implemented. - 2748 "swappable traits for optionals" Already conforming. - 2753 "Optional's constructors and assignments need constraints" Implemented. Most of the work for this patch was done by Casey Carter @ Microsoft. Thank you Casey! Reviewers: mclow.lists, CaseyCarter, EricWF Differential Revision: https://reviews.llvm.org/D22741 llvm-svn: 283980
2016-10-12 15:46:20 +08:00
#if !__has_builtin(__builtin_addressof) && _GNUC_VER < 700
#define _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
Implement N4606 optional Summary: Adapt implementation of Library Fundamentals TS optional into an implementation of N4606 optional. - Update relational operators per http://wg21.link/P0307 - Update to requirements of http://wg21.link/P0032 - Extension: Implement trivial copy/move construction/assignment for `optional<T>` when `T` is trivially copyable. Audit P/Rs for optional LWG issues: - 2756 "C++ WP optional<T> should 'forward' T's implicit conversions" Implemented, which also resolves 2753 "Optional's constructors and assignments need constraints" (modulo my refusal to explicitly delete the move operations, which is a design error that I'm working on correcting in the 2756 P/R). - 2736 "nullopt_t insufficiently constrained" Already conforming. I've added a test ensuring that `nullopt_t` is not copy-initializable from an empty braced-init-list, which I believe is the root intent of the issue, to avoid regression. - 2740 "constexpr optional<T>::operator->" Already conforming. - 2746 "Inconsistency between requirements for emplace between optional and variant" No P/R, but note that the author's '"suggested resolution" is already implemented. - 2748 "swappable traits for optionals" Already conforming. - 2753 "Optional's constructors and assignments need constraints" Implemented. Most of the work for this patch was done by Casey Carter @ Microsoft. Thank you Casey! Reviewers: mclow.lists, CaseyCarter, EricWF Differential Revision: https://reviews.llvm.org/D22741 llvm-svn: 283980
2016-10-12 15:46:20 +08:00
#endif
#if !__has_builtin(__builtin_is_constant_evaluated) && _GNUC_VER < 900
#define _LIBCPP_HAS_NO_BUILTIN_IS_CONSTANT_EVALUATED
#endif
#if !defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS)
# if defined(_LIBCPP_MSVCRT) || defined(_NEWLIB_VERSION)
# define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS
# endif
#endif
#if __has_attribute(diagnose_if) && !defined(_LIBCPP_DISABLE_ADDITIONAL_DIAGNOSTICS)
# define _LIBCPP_DIAGNOSE_WARNING(...) \
__attribute__((diagnose_if(__VA_ARGS__, "warning")))
# define _LIBCPP_DIAGNOSE_ERROR(...) \
__attribute__((diagnose_if(__VA_ARGS__, "error")))
#else
# define _LIBCPP_DIAGNOSE_WARNING(...)
# define _LIBCPP_DIAGNOSE_ERROR(...)
#endif
// Use a function like macro to imply that it must be followed by a semicolon
#if __cplusplus > 201402L && __has_cpp_attribute(fallthrough)
# define _LIBCPP_FALLTHROUGH() [[fallthrough]]
#elif __has_cpp_attribute(clang::fallthrough)
# define _LIBCPP_FALLTHROUGH() [[clang::fallthrough]]
#elif __has_attribute(fallthrough) || _GNUC_VER >= 700
# define _LIBCPP_FALLTHROUGH() __attribute__((__fallthrough__))
#else
# define _LIBCPP_FALLTHROUGH() ((void)0)
#endif
#if __has_attribute(__nodebug__)
#define _LIBCPP_NODEBUG __attribute__((__nodebug__))
#else
#define _LIBCPP_NODEBUG
#endif
#ifndef _LIBCPP_NODEBUG_TYPE
#if __has_attribute(__nodebug__) && \
(defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER >= 900)
#define _LIBCPP_NODEBUG_TYPE __attribute__((nodebug))
#else
#define _LIBCPP_NODEBUG_TYPE
#endif
#endif // !defined(_LIBCPP_NODEBUG_TYPE)
#if __has_attribute(__preferred_name__)
#define _LIBCPP_PREFERRED_NAME(x) __attribute__((__preferred_name__(x)))
#else
#define _LIBCPP_PREFERRED_NAME(x)
#endif
#if defined(_LIBCPP_ABI_MICROSOFT) && \
(defined(_LIBCPP_COMPILER_MSVC) || __has_declspec_attribute(empty_bases))
# define _LIBCPP_DECLSPEC_EMPTY_BASES __declspec(empty_bases)
#else
# define _LIBCPP_DECLSPEC_EMPTY_BASES
#endif
#if defined(_LIBCPP_ENABLE_CXX17_REMOVED_FEATURES)
#define _LIBCPP_ENABLE_CXX17_REMOVED_AUTO_PTR
#define _LIBCPP_ENABLE_CXX17_REMOVED_UNEXPECTED_FUNCTIONS
#define _LIBCPP_ENABLE_CXX17_REMOVED_RANDOM_SHUFFLE
#define _LIBCPP_ENABLE_CXX17_REMOVED_BINDERS
#endif // _LIBCPP_ENABLE_CXX17_REMOVED_FEATURES
#if !defined(__cpp_deduction_guides) || __cpp_deduction_guides < 201611
#define _LIBCPP_HAS_NO_DEDUCTION_GUIDES
#endif
#if !__has_keyword(__is_aggregate) && (_GNUC_VER_NEW < 7001)
#define _LIBCPP_HAS_NO_IS_AGGREGATE
#endif
#if !defined(__cpp_coroutines) || __cpp_coroutines < 201703L
#define _LIBCPP_HAS_NO_COROUTINES
#endif
#if !defined(__cpp_impl_three_way_comparison) || __cpp_impl_three_way_comparison < 201907L
#define _LIBCPP_HAS_NO_SPACESHIP_OPERATOR
#endif
#if defined(_LIBCPP_COMPILER_IBM)
#define _LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO
#endif
#if defined(_LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO)
# define _LIBCPP_PUSH_MACROS
# define _LIBCPP_POP_MACROS
#else
// Don't warn about macro conflicts when we can restore them at the
// end of the header.
# ifndef _LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS
# define _LIBCPP_DISABLE_MACRO_CONFLICT_WARNINGS
# endif
# if defined(_LIBCPP_COMPILER_MSVC)
# define _LIBCPP_PUSH_MACROS \
__pragma(push_macro("min")) \
__pragma(push_macro("max"))
# define _LIBCPP_POP_MACROS \
__pragma(pop_macro("min")) \
__pragma(pop_macro("max"))
# else
# define _LIBCPP_PUSH_MACROS \
_Pragma("push_macro(\"min\")") \
_Pragma("push_macro(\"max\")")
# define _LIBCPP_POP_MACROS \
_Pragma("pop_macro(\"min\")") \
_Pragma("pop_macro(\"max\")")
# endif
#endif // defined(_LIBCPP_HAS_NO_PRAGMA_PUSH_POP_MACRO)
#ifndef _LIBCPP_NO_AUTO_LINK
# if defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
# if defined(_DLL)
# pragma comment(lib, "c++.lib")
# else
# pragma comment(lib, "libc++.lib")
# endif
# endif // defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_BUILDING_LIBRARY)
#endif // _LIBCPP_NO_AUTO_LINK
#define _LIBCPP_UNUSED_VAR(x) ((void)(x))
// Configures the fopen close-on-exec mode character, if any. This string will
// be appended to any mode string used by fstream for fopen/fdopen.
//
// Not all platforms support this, but it helps avoid fd-leaks on platforms that
// do.
#if defined(__BIONIC__)
# define _LIBCPP_FOPEN_CLOEXEC_MODE "e"
#else
# define _LIBCPP_FOPEN_CLOEXEC_MODE
#endif
#ifdef _LIBCPP_COMPILER_HAS_BUILTIN_CONSTANT_P
#define _LIBCPP_BUILTIN_CONSTANT_P(x) __builtin_constant_p(x)
#else
#define _LIBCPP_BUILTIN_CONSTANT_P(x) false
#endif
// Support for _FILE_OFFSET_BITS=64 landed gradually in Android, so the full set
// of functions used in cstdio may not be available for low API levels when
// using 64-bit file offsets on LP32.
#if defined(__BIONIC__) && defined(__USE_FILE_OFFSET64) && __ANDROID_API__ < 24
#define _LIBCPP_HAS_NO_FGETPOS_FSETPOS
#endif
#if __has_attribute(init_priority)
# define _LIBCPP_INIT_PRIORITY_MAX __attribute__((init_priority(101)))
#else
# define _LIBCPP_INIT_PRIORITY_MAX
#endif
#endif // __cplusplus
#endif // _LIBCPP_CONFIG