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//===-- Libc specific custom operator new and delete ------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIBC_SRC___SUPPORT_ALLOC_CHECKER_H
#define LLVM_LIBC_SRC___SUPPORT_ALLOC_CHECKER_H
#include "hdr/func/aligned_alloc.h"
#include "hdr/func/malloc.h"
#include "src/__support/CPP/new.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/properties/os.h"
namespace LIBC_NAMESPACE_DECL {
class AllocChecker {
bool success = false;
LIBC_INLINE AllocChecker &operator=(bool status) {
success = status;
return *this;
}
public:
LIBC_INLINE AllocChecker() = default;
LIBC_INLINE operator bool() const { return success; }
LIBC_INLINE static void *alloc(size_t s, AllocChecker &ac) {
void *mem = ::malloc(s);
ac = (mem != nullptr);
return mem;
}
LIBC_INLINE static void *aligned_alloc(size_t s, std::align_val_t align,
AllocChecker &ac) {
#ifdef LIBC_TARGET_OS_IS_WINDOWS
// std::aligned_alloc is not available on Windows because std::free on
// Windows cannot deallocate any over-aligned memory. Microsoft provides an
// alternative for std::aligned_alloc named _aligned_malloc, but it must be
// paired with _aligned_free instead of std::free.
void *mem = ::_aligned_malloc(static_cast<size_t>(align), s);
#else
void *mem = ::aligned_alloc(static_cast<size_t>(align), s);
#endif
ac = (mem != nullptr);
return mem;
}
};
} // namespace LIBC_NAMESPACE_DECL
LIBC_INLINE void *operator new(size_t size,
LIBC_NAMESPACE::AllocChecker &ac) noexcept {
return LIBC_NAMESPACE::AllocChecker::alloc(size, ac);
}
LIBC_INLINE void *operator new(size_t size, std::align_val_t align,
LIBC_NAMESPACE::AllocChecker &ac) noexcept {
return LIBC_NAMESPACE::AllocChecker::aligned_alloc(size, align, ac);
}
LIBC_INLINE void *operator new[](size_t size,
LIBC_NAMESPACE::AllocChecker &ac) noexcept {
return LIBC_NAMESPACE::AllocChecker::alloc(size, ac);
}
LIBC_INLINE void *operator new[](size_t size, std::align_val_t align,
LIBC_NAMESPACE::AllocChecker &ac) noexcept {
return LIBC_NAMESPACE::AllocChecker::aligned_alloc(size, align, ac);
}
#endif // LLVM_LIBC_SRC___SUPPORT_ALLOC_CHECKER_H
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