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[libc++] Introduce _LIBCPP_OVERRIDABLE_FUNC_VIS

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This is a generalization of `_LIBCPP_NEW_DELETE_VIS`; the new macro name
captures the semantics better, and also allows us to get rid of the
`_WIN32` check in `include/new`. No functional change.

Differential Revision: https://reviews.llvm.org/D26702

llvm-svn: 287164
This commit is contained in:
Shoaib Meenai 2016-11-16 22:18:10 +00:00
parent 7fa40c9f2b
commit dce4218df7
4 changed files with 59 additions and 60 deletions
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26
libcxx/docs/DesignDocs/VisibilityMacros.rst
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@ -22,6 +22,18 @@ Visibility Macros
Mark a symbol as being exported by the libc++ library. This attribute must
be applied to the declaration of all functions exported by the libc++ dylib.
**_LIBCPP_OVERRIDABLE_FUNC_VIS**
Mark a symbol as being exported by the libc++ library, but allow it to be
overridden locally. On non-Windows, this is equivalent to `_LIBCPP_FUNC_VIS`.
This macro is applied to all `operator new` and `operator delete` overloads.
**Windows Behavior**: Any symbol marked `dllimport` cannot be overridden
locally, since `dllimport` indicates the symbol should be bound to a separate
DLL. All `operator new` and `operator delete` overloads are required to be
locally overridable, and therefore must not be marked `dllimport`. On Windows,
this macro therefore expands to `__declspec(dllexport)` when building the
library and has an empty definition otherwise.
**_LIBCPP_INLINE_VISIBILITY**
Mark a function as hidden and force inlining whenever possible.
@ -107,20 +119,6 @@ Visibility Macros
versioning namespace. This allows throwing and catching some exception types
between libc++ and libstdc++.
**_LIBCPP_NEW_DELETE_VIS**
Mark a symbol as being exported by the libc++ library. This macro must be
applied to all `operator new` and `operator delete` overloads.
**Windows Behavior**: The `operator new` and `operator delete` overloads
should not be marked as `dllimport`; if they were, source files including the
`<new>` header (either directly or transitively) would lose the ability to use
local overloads of `operator new` and `operator delete`. On Windows, this
macro therefore expands to `__declspec(dllexport)` when building the library
and has an empty definition otherwise. A related caveat is that libc++ must be
included on the link line before `msvcrt.lib`, otherwise Microsoft's
definitions of `operator new` and `operator delete` inside `msvcrt.lib` will
end up being used instead of libc++'s.
Links
=====

7
libcxx/include/__config
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@ -524,14 +524,17 @@ namespace std {
# define _LIBCPP_DLL_VIS
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS
#elif defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_DLL_VIS __declspec(dllexport)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS _LIBCPP_DLL_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_DLL_VIS
#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
#endif
#define _LIBCPP_TYPE_VIS _LIBCPP_DLL_VIS
@ -576,6 +579,10 @@ namespace std {
# define _LIBCPP_FUNC_VIS_ONLY _LIBCPP_FUNC_VIS
#endif
#ifndef _LIBCPP_OVERRIDABLE_FUNC_VIS
# define _LIBCPP_OVERRIDABLE_FUNC_VIS _LIBCPP_FUNC_VIS
#endif
#ifndef _LIBCPP_EXCEPTION_ABI
#define _LIBCPP_EXCEPTION_ABI __attribute__ ((__visibility__("default")))
#endif

46
libcxx/include/new
View File

@ -162,49 +162,43 @@ _LIBCPP_FUNC_VIS new_handler get_new_handler() _NOEXCEPT;
} // std
#if defined(_WIN32) && !defined(_LIBCPP_BUILDING_LIBRARY)
# define _LIBCPP_NEW_DELETE_VIS
#else
# define _LIBCPP_NEW_DELETE_VIS _LIBCPP_FUNC_VIS
#endif
#if !__has_feature(cxx_noexcept)
#define _THROW_BAD_ALLOC throw(std::bad_alloc)
#else
#define _THROW_BAD_ALLOC
#endif
_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC;
_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p) _NOEXCEPT;
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p, const std::nothrow_t&) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz) _THROW_BAD_ALLOC;
_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
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz) _NOEXCEPT;
#endif
_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC;
_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p) _NOEXCEPT;
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p, const std::nothrow_t&) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz) _THROW_BAD_ALLOC;
_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;
#ifdef _LIBCPP_HAS_NO_SIZED_DEALLOCATION
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz) _NOEXCEPT;
#endif
#ifndef _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
_LIBCPP_NEW_DELETE_VIS void* operator new(std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p, std::align_val_t) _NOEXCEPT;
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new(std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
_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
_LIBCPP_NEW_DELETE_VIS void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete(void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
#endif
_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
_LIBCPP_NEW_DELETE_VIS void* operator new[](std::size_t __sz, std::align_val_t, const std::nothrow_t&) _NOEXCEPT _NOALIAS;
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p, std::align_val_t) _NOEXCEPT;
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p, std::align_val_t, const std::nothrow_t&) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void* operator new[](std::size_t __sz, std::align_val_t) _THROW_BAD_ALLOC;
_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
_LIBCPP_NEW_DELETE_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
_LIBCPP_OVERRIDABLE_FUNC_VIS void operator delete[](void* __p, std::size_t __sz, std::align_val_t) _NOEXCEPT;
#endif
#endif

40
libcxx/src/new.cpp
View File

@ -37,7 +37,7 @@
// in this shared library, so that they can be overridden by programs
// that define non-weak copies of the functions.
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void *
operator new(std::size_t size) _THROW_BAD_ALLOC
{
@ -61,7 +61,7 @@ operator new(std::size_t size) _THROW_BAD_ALLOC
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void *
operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
{
@ -89,7 +89,7 @@ operator new(std::size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new(size_t size, const std::nothrow_t&) _NOEXCEPT
{
@ -108,7 +108,7 @@ operator new(size_t size, const std::nothrow_t&) _NOEXCEPT
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
{
@ -127,21 +127,21 @@ operator new(size_t size, std::align_val_t alignment, const std::nothrow_t&) _NO
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new[](size_t size) _THROW_BAD_ALLOC
{
return ::operator new(size);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new[](size_t size, std::align_val_t alignment) _THROW_BAD_ALLOC
{
return ::operator new(size, alignment);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
{
@ -160,7 +160,7 @@ operator new[](size_t size, const std::nothrow_t&) _NOEXCEPT
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void*
operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
{
@ -179,7 +179,7 @@ operator new[](size_t size, std::align_val_t alignment, const std::nothrow_t&) _
return p;
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr) _NOEXCEPT
{
@ -187,7 +187,7 @@ operator delete(void* ptr) _NOEXCEPT
::free(ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr, std::align_val_t) _NOEXCEPT
{
@ -195,70 +195,70 @@ operator delete(void* ptr, std::align_val_t) _NOEXCEPT
::free(ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr, const std::nothrow_t&) _NOEXCEPT
{
::operator delete(ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
{
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr, size_t) _NOEXCEPT
{
::operator delete(ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete(void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT
{
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr) _NOEXCEPT
{
::operator delete(ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr, std::align_val_t alignment) _NOEXCEPT
{
::operator delete(ptr, alignment);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr, const std::nothrow_t&) _NOEXCEPT
{
::operator delete[](ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr, std::align_val_t alignment, const std::nothrow_t&) _NOEXCEPT
{
::operator delete[](ptr, alignment);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr, size_t) _NOEXCEPT
{
::operator delete[](ptr);
}
_LIBCPP_WEAK _LIBCPP_NEW_DELETE_VIS
_LIBCPP_WEAK
void
operator delete[] (void* ptr, size_t, std::align_val_t alignment) _NOEXCEPT
{