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darling-libcxx/include/__config
Eric Fiselier f6535885b9 Fix undefined behavior in __hash_table 
Summary:
This patch attempts to fix the undefined behavior in __hash_table 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 `__hash_table` arises because tree downcasts the embedded end node and then deferences that pointer. Currently there are 2 node types in __hash_table:

* `__hash_node_base` which contains the `__next_` pointer.
* `__hash_node` which contains `__hash_` and `__value_`.

Currently the bucket list, iterators, and `__next_` pointers store pointers to `__hash_node` even though they all need to store `__hash_node_base` pointers.
This patch makes that change by introducing a `__next_pointer` typedef which is a pointer to `__hash_node` in the current ABI and `__hash_node_base` afterwards.

One notable change is to the type of `__bucket_list` which used to be defined as `unique_ptr<__node_pointer[], ...>` and is now `unique_ptr<__next_pointer[], ...>` meaning that we now allocate and deallocate different types using a different allocator. I'm going to give this part of the change more thought since it may introduce compatibility issues.

This change is similar to D20786.



Reviewers: mclow.lists, EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D20787

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276533 91177308-0d34-0410-b5e6-96231b3b80d8
2016-07-23 20:36:55 +00:00

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// -*- C++ -*-
//===--------------------------- __config ---------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_CONFIG
#define _LIBCPP_CONFIG
#if defined(_MSC_VER) && !defined(__clang__)
#define _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
#endif
#ifndef _LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER
#pragma GCC system_header
#endif
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#ifdef __GNUC__
#define _GNUC_VER (__GNUC__ * 100 + __GNUC_MINOR__)
#else
#define _GNUC_VER 0
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#define _LIBCPP_ABI_VERSION 1
#endif
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// Change short string represention 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 it's linked nodes.
#define _LIBCPP_ABI_LIST_REMOVE_NODE_POINTER_UB
// 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 it's pointer types
#define _LIBCPP_ABI_FIX_UNORDERED_NODE_POINTER_UB
#define _LIBCPP_ABI_FORWARD_LIST_REMOVE_NODE_POINTER_UB
#define _LIBCPP_ABI_FIX_UNORDERED_CONTAINER_SIZE_TYPE
#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
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#define _LIBCPP_HAS_QUICK_EXIT
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#define _LIBCPP_HAS_NO_DEFAULT_FUNCTION_TEMPLATE_ARGS
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#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
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#define _LIBCPP_HAS_NO_CONSTEXPR
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#define _LIBCPP_HAS_NO_VARIADICS
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#define _VSTD std
# define _LIBCPP_WEAK
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#define _LIBCPP_HAS_NO_ASAN
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#define _ATTRIBUTE(x) __attribute__((x))
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#define _LIBCPP_HAS_NO_NOEXCEPT
#define _LIBCPP_HAS_NO_NULLPTR
#define _LIBCPP_HAS_NO_UNICODE_CHARS
#define _LIBCPP_HAS_IS_BASE_OF
#define _LIBCPP_HAS_IS_FINAL
#define _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
#if defined(_AIX)
#define __MULTILOCALE_API
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#define _VSTD std::_LIBCPP_NAMESPACE
namespace std {
inline namespace _LIBCPP_NAMESPACE {
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template <bool> struct __static_assert_test;
template <> struct __static_assert_test<true> {};
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typedef __static_assert_check<sizeof(__static_assert_test<(__b)>)> \
_LIBCPP_CONCAT(__t, __LINE__)
#endif // _LIBCPP_HAS_NO_STATIC_ASSERT
#ifdef _LIBCPP_HAS_NO_DECLTYPE
// GCC 4.6 provides __decltype in all standard modes.
#if !__is_identifier(__decltype) || _GNUC_VER >= 406
# define decltype(__x) __decltype(__x)
#else
# define decltype(__x) __typeof__(__x)
#endif
#endif
#ifdef _LIBCPP_HAS_NO_CONSTEXPR
#define _LIBCPP_CONSTEXPR
#else
#define _LIBCPP_CONSTEXPR constexpr
#endif
#ifdef _LIBCPP_HAS_NO_DEFAULTED_FUNCTIONS
#define _LIBCPP_DEFAULT {}
#else
#define _LIBCPP_DEFAULT = default;
#endif
#ifdef _LIBCPP_HAS_NO_DELETED_FUNCTIONS
#define _LIBCPP_EQUAL_DELETE
#else
#define _LIBCPP_EQUAL_DELETE = delete
#endif
#ifdef __GNUC__
#define _NOALIAS __attribute__((__malloc__))
#else
#define _NOALIAS
#endif
#if __has_feature(cxx_explicit_conversions) || defined(__IBMCPP__)
# define _LIBCPP_EXPLICIT explicit
#else
# define _LIBCPP_EXPLICIT
#endif
#if !__has_builtin(__builtin_operator_new) || !__has_builtin(__builtin_operator_delete)
# define _LIBCPP_HAS_NO_BUILTIN_OPERATOR_NEW_DELETE
#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_ALWAYS_INLINE x(__lx __v) : __v_(__v) {} \
_LIBCPP_ALWAYS_INLINE explicit x(int __v) : __v_(static_cast<__lx>(__v)) {} \
_LIBCPP_ALWAYS_INLINE operator int() const {return __v_;} \
};
#else // _LIBCPP_HAS_NO_STRONG_ENUMS
#define _LIBCPP_DECLARE_STRONG_ENUM(x) enum class _LIBCPP_TYPE_VIS x
#define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x)
#endif // _LIBCPP_HAS_NO_STRONG_ENUMS
#ifdef _LIBCPP_DEBUG
# if _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
# define _LIBCPP_EXTERN_TEMPLATE(...)
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE
#define _LIBCPP_EXTERN_TEMPLATE(...) extern template __VA_ARGS__;
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE2
#define _LIBCPP_EXTERN_TEMPLATE2(...) extern template __VA_ARGS__;
#endif
#if defined(__APPLE__) && defined(__LP64__) && !defined(__x86_64__)
#define _LIBCPP_NONUNIQUE_RTTI_BIT (1ULL << 63)
#endif
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(_WIN32) || \
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(_WIN32) && !defined(__ANDROID__) && !defined(_NEWLIB_VERSION)
#define _LIBCPP_HAS_CATOPEN 1
#endif
#endif
#ifdef __FreeBSD__
#define _DECLARE_C99_LDBL_MATH 1
#endif
#if defined(__APPLE__) || defined(__FreeBSD__)
#define _LIBCPP_HAS_DEFAULTRUNELOCALE
#endif
#if defined(__APPLE__) || defined(__FreeBSD__) || defined(__sun__)
#define _LIBCPP_WCTYPE_IS_MASK
#endif
#ifndef _LIBCPP_STD_VER
# if __cplusplus <= 201103L
# define _LIBCPP_STD_VER 11
# elif __cplusplus <= 201402L
# define _LIBCPP_STD_VER 14
# else
# define _LIBCPP_STD_VER 16 // current year, or date of c++17 ratification
# endif
#endif // _LIBCPP_STD_VER
#if _LIBCPP_STD_VER > 11
#define _LIBCPP_DEPRECATED [[deprecated]]
#else
#define _LIBCPP_DEPRECATED
#endif
#if _LIBCPP_STD_VER <= 11
#define _LIBCPP_EXPLICIT_AFTER_CXX11
#define _LIBCPP_DEPRECATED_AFTER_CXX11
#else
#define _LIBCPP_EXPLICIT_AFTER_CXX11 explicit
#define _LIBCPP_DEPRECATED_AFTER_CXX11 [[deprecated]]
#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
#ifdef _LIBCPP_HAS_NO_RVALUE_REFERENCES
# define _LIBCPP_EXPLICIT_MOVE(x) _VSTD::move(x)
#else
# define _LIBCPP_EXPLICIT_MOVE(x) (x)
#endif
#ifndef _LIBCPP_HAS_NO_ASAN
extern "C" void __sanitizer_annotate_contiguous_container(
const void *, const void *, const void *, const void *);
#endif
// Try to find out if RTTI is disabled.
// g++ and cl.exe have RTTI on by default and define a macro when it is.
// g++ only defines the macro in 4.3.2 and onwards.
#if !defined(_LIBCPP_NO_RTTI)
# if defined(__GNUC__) && ((__GNUC__ >= 5) || (__GNUC__ == 4 && \
(__GNUC_MINOR__ >= 3 || __GNUC_PATCHLEVEL__ >= 2))) && !defined(__GXX_RTTI)
# define _LIBCPP_NO_RTTI
# elif (defined(_MSC_VER) && !defined(__clang__)) && !defined(_CPPRTTI)
# define _LIBCPP_NO_RTTI
# endif
#endif
#ifndef _LIBCPP_WEAK
# define _LIBCPP_WEAK __attribute__((__weak__))
#endif
// Thread API
#if !defined(_LIBCPP_HAS_NO_THREADS) && !defined(_LIBCPP_HAS_THREAD_API_PTHREAD)
# if defined(__FreeBSD__) || \
defined(__NetBSD__) || \
defined(__linux__) || \
defined(__APPLE__) || \
defined(__CloudABI__) || \
defined(__sun__)
# define _LIBCPP_HAS_THREAD_API_PTHREAD
# else
# error "No thread API"
# endif // _LIBCPP_HAS_THREAD_API
#endif // _LIBCPP_HAS_NO_THREADS
#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
#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
// 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
#if defined(__ANDROID__) || defined(__CloudABI__) || defined(_LIBCPP_HAS_MUSL_LIBC)
#define _LIBCPP_PROVIDES_DEFAULT_RUNE_TABLE
#endif
// Thread-unsafe functions such as strtok(), mbtowc() 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)
#define _LIBCPP_HAS_C_ATOMIC_IMP
#elif _GNUC_VER > 407
#define _LIBCPP_HAS_GCC_ATOMIC_IMP
#endif
#if (!defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_GCC_ATOMIC_IMP)) \
|| defined(_LIBCPP_HAS_NO_THREADS)
#define _LIBCPP_HAS_NO_ATOMIC_HEADER
#endif
#ifndef _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
#define _LIBCPP_DISABLE_UBSAN_UNSIGNED_INTEGER_CHECK
#endif
#if __cplusplus < 201103L
#define _LIBCPP_CXX03_LANG
#else
#if defined(_LIBCPP_HAS_NO_VARIADIC_TEMPLATES) || defined(_LIBCPP_HAS_NO_RVALUE_REFERENCES)
#error Libc++ requires a feature complete C++11 compiler in C++11 or greater.
#endif
#endif
#if (defined(_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS) && defined(__clang__) \
&& __has_attribute(acquire_capability))
#define _LIBCPP_HAS_THREAD_SAFETY_ANNOTATIONS
#endif
#endif // __cplusplus
#endif // _LIBCPP_CONFIG
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