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Distinguish between library and language support for aligned allocation.

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There are two cases:
1. The library has all it needs to provide align_val_t and the
new/delete overloads needed to support aligned allocation.
2. The compiler has actually turned the language feature on.

There are times where libc++ needs to distinguish between the two.

This patch adds the additional macro
_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION which denotes when case (1)
does not hold. _LIBCPP_HAS_NO_ALIGNED_ALLOCATION is defined whenever
_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION is defined, or when the
compiler has not enabled the language feature.

Additionally this patch cleans up a number of other macros related
to detection of aligned allocation machinery.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@344207 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2018-10-11 00:17:24 +00:00
parent b5d4ffd60d
commit 657a13025c
4 changed files with 33 additions and 29 deletions
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15
include/__config
View File

@@ -984,7 +984,14 @@ template <unsigned> struct __static_assert_check {};
// 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_ALIGNED_ALLOCATION
#define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#elif defined(_LIBCPP_ABI_MICROSOFT) && !defined(_LIBCPP_NO_VCRUNTIME)
#define _LIBCPP_DEFER_NEW_TO_VCRUNTIME
#if !defined(__cpp_aligned_new)
// We're defering to Microsoft's STL to provide aligned new et al. We don't
// have it unless the language feature test macro is defined.
#define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#endif
#endif
#if defined(__APPLE__)
@@ -994,14 +1001,14 @@ template <unsigned> struct __static_assert_check {};
# endif
# if defined(__MAC_OS_X_VERSION_MIN_REQUIRED)
# if __MAC_OS_X_VERSION_MIN_REQUIRED < 1060
# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
# define _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
# endif
# endif
#endif // defined(__APPLE__)
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) && \
!defined(_LIBCPP_BUILDING_LIBRARY) && \
(!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606)
(defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) || \
(!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606))
# define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
#endif

2
include/memory
View File

@@ -2016,7 +2016,7 @@ get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT
__n = __m;
while (__n > 0)
{
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
if (__is_overaligned_for_new(__alignof(_Tp)))
{
std::align_val_t __al =

39
include/new
View File

@@ -104,16 +104,18 @@ void operator delete[](void* ptr, void*) noexcept;
#pragma GCC system_header
#endif
#if !(defined(_LIBCPP_BUILDING_LIBRARY) || _LIBCPP_STD_VER >= 14 || \
(defined(__cpp_sized_deallocation) && __cpp_sized_deallocation >= 201309))
#if !defined(_LIBCPP_BUILDING_LIBRARY) && _LIBCPP_STD_VER < 14
# define _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
#endif
#if defined(_LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION) || \
!defined(__cpp_sized_deallocation) || __cpp_sized_deallocation < 201309
# define _LIBCPP_HAS_NO_SIZED_DEALLOCATION
#endif
#if !__has_builtin(__builtin_operator_new) || \
__has_builtin(__builtin_operator_new) < 201802L || \
defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || \
!defined(__cpp_aligned_new) || __cpp_aligned_new < 201606
#define _LIBCPP_HAS_NO_BUILTIN_ALIGNED_OPERATOR_NEW_DELETE
__has_builtin(__builtin_operator_new) < 201802L
#define _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE
#endif
namespace std // purposefully not using versioning namespace
@@ -163,19 +165,14 @@ public:
#endif // defined(_LIBCPP_BUILDING_LIBRARY) || (_LIBCPP_STD_VER > 11)
#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION) || _LIBCPP_STD_VER > 14
#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION) && \
!defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME)
#ifndef _LIBCPP_CXX03_LANG
enum class _LIBCPP_ENUM_VIS align_val_t : size_t { };
#else
enum align_val_t { __zero = 0, __max = (size_t)-1 };
#endif
#endif
#elif !defined(__cpp_aligned_new)
// We're defering to Microsoft's STL to provide aligned new et al. We don't
// have it unless the language feature test macro is defined.
#define _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
#endif
} // std
@@ -185,13 +182,13 @@ enum align_val_t { __zero = 0, __max = (size_t)-1 };
#define _THROW_BAD_ALLOC
#endif
#if !defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)
#if !defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME)
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC;
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
#endif
@@ -199,16 +196,16 @@ _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;
#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT;
#endif
#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
#ifndef _LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
#endif
@@ -216,7 +213,7 @@ _LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](
_LIBCPP_NODISCARD_AFTER_CXX17 _LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
#ifndef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION
_LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_AVAILABILITY_SIZED_NEW_DELETE void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
#endif
#endif
@@ -226,7 +223,7 @@ _LIBCPP_NODISCARD_AFTER_CXX17 inline _LIBCPP_INLINE_VISIBILITY void* operator ne
inline _LIBCPP_INLINE_VISIBILITY void operator delete (void*, void*) _NOEXCEPT {}
inline _LIBCPP_INLINE_VISIBILITY void operator delete[](void*, void*) _NOEXCEPT {}
#endif // !_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME
#endif // !_LIBCPP_DEFER_NEW_TO_VCRUNTIME
_LIBCPP_BEGIN_NAMESPACE_STD
@@ -262,7 +259,7 @@ inline _LIBCPP_INLINE_VISIBILITY void __libcpp_deallocate(void* __ptr, size_t __
#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
if (__is_overaligned_for_new(__align)) {
const align_val_t __align_val = static_cast<align_val_t>(__align);
# ifdef _LIBCPP_HAS_NO_BUILTIN_ALIGNED_OPERATOR_NEW_DELETE
# ifdef _LIBCPP_HAS_NO_BUILTIN_OVERLOADED_OPERATOR_NEW_DELETE
return ::operator delete(__ptr, __align_val);
# else
return __builtin_operator_delete(__ptr, __align_val);

6
src/new.cpp
View File

@@ -55,7 +55,7 @@ __throw_bad_alloc()
} // std
#if !defined(__GLIBCXX__) && \
(!defined(_LIBCPP_ABI_MICROSOFT) || defined(_LIBCPP_NO_VCRUNTIME)) && \
!defined(_LIBCPP_DEFER_NEW_TO_VCRUNTIME) && \
!defined(_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS)
// Implement all new and delete operators as weak definitions
@@ -173,7 +173,7 @@ operator delete[] (void* ptr, size_t) _NOEXCEPT
::operator delete[](ptr);
}
#if !defined(_LIBCPP_HAS_NO_ALIGNED_ALLOCATION)
#if !defined(_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION)
_LIBCPP_WEAK
void *
@@ -298,5 +298,5 @@ operator delete[] (void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT
::operator delete[](ptr, alignment);
}
#endif // !_LIBCPP_HAS_NO_ALIGNED_ALLOCATION
#endif // !_LIBCPP_HAS_NO_LIBRARY_ALIGNED_ALLOCATION
#endif // !__GLIBCXX__ && (!_LIBCPP_ABI_MICROSOFT || _LIBCPP_NO_VCRUNTIME) && !_LIBCPP_DISABLE_NEW_DELETE_DEFINITIONS