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better attributes on new/delete overrides for Microsoft visual C++

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This commit is contained in:
Daan Leijen 2022-11-28 09:15:16 -08:00
parent c1299484de
commit be2bc9e7ca
2 changed files with 16 additions and 5 deletions
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17
include/mimalloc-new-delete.h
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@ -22,17 +22,26 @@ terms of the MIT license. A copy of the license can be found in the file
#include <new>
#include <mimalloc.h>
#if defined(_MSC_VER) && defined(_Ret_notnull_) && defined(_Post_writable_byte_size_)
// stay consistent with VCRT definitions
#define mi_decl_new(n) mi_decl_nodiscard mi_decl_restrict _Ret_notnull_ _Post_writable_byte_size_(n)
#define mi_decl_new_nothrow(n) mi_decl_nodiscard mi_decl_restrict _Ret_maybenull_ _Success_(return != NULL) _Post_writable_byte_size_(n)
#else
#define mi_decl_new(n) mi_decl_nodiscard mi_decl_restrict
#define mi_decl_new_nothrow(n) mi_decl_nodiscard mi_decl_restrict
#endif
void operator delete(void* p) noexcept { mi_free(p); };
void operator delete[](void* p) noexcept { mi_free(p); };
void operator delete (void* p, const std::nothrow_t&) noexcept { mi_free(p); }
void operator delete[](void* p, const std::nothrow_t&) noexcept { mi_free(p); }
void* operator new(std::size_t n) noexcept(false) { return mi_new(n); }
void* operator new[](std::size_t n) noexcept(false) { return mi_new(n); }
mi_decl_new(n) void* operator new(std::size_t n) noexcept(false) { return mi_new(n); }
mi_decl_new(n) void* operator new[](std::size_t n) noexcept(false) { return mi_new(n); }
void* operator new (std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
mi_decl_new_nothrow(n) void* operator new (std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
mi_decl_new_nothrow(n) void* operator new[](std::size_t n, const std::nothrow_t& tag) noexcept { (void)(tag); return mi_new_nothrow(n); }
#if (__cplusplus >= 201402L || _MSC_VER >= 1916)
void operator delete (void* p, std::size_t n) noexcept { mi_free_size(p,n); };

4
include/mimalloc.h
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@ -28,8 +28,10 @@ terms of the MIT license. A copy of the license can be found in the file
#define mi_decl_nodiscard [[nodiscard]]
#elif (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) // includes clang, icc, and clang-cl
#define mi_decl_nodiscard __attribute__((warn_unused_result))
#elif defined(_HAS_NODISCARD)
#define mi_decl_nodiscard _NODISCARD
#elif (_MSC_VER >= 1700)
#define mi_decl_nodiscard _Check_return_
#define mi_decl_nodiscard _Check_return_
#else
#define mi_decl_nodiscard
#endif