ladybird/Kernel/Heap/kmalloc.h
Andrew Kaster ddea37b521 Kernel+LibC: Move name length constants to Kernel/API from limits.h
Reduce inclusion of limits.h as much as possible at the same time.

This does mean that kmalloc.h is now including Kernel/API/POSIX/limits.h
instead of LibC/limits.h, but the scope could be limited a lot more.
Basically every file in the kernel includes kmalloc.h, and needs the
limits.h include for PAGE_SIZE.
2023-01-21 10:43:59 -07:00

87 lines
3.6 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Types.h>
#include <Kernel/API/POSIX/sys/limits.h> // For PAGE_SIZE. Everyone needs PAGE_SIZE
#define KMALLOC_SCRUB_BYTE 0xbb
#define KFREE_SCRUB_BYTE 0xaa
#define MAKE_ALIGNED_ALLOCATED(type, alignment) \
public: \
[[nodiscard]] void* operator new(size_t) \
{ \
void* ptr = kmalloc_aligned(sizeof(type), alignment); \
VERIFY(ptr); \
return ptr; \
} \
[[nodiscard]] void* operator new(size_t, std::nothrow_t const&) noexcept \
{ \
return kmalloc_aligned(sizeof(type), alignment); \
} \
void operator delete(void* ptr) noexcept \
{ \
kfree_sized(ptr, sizeof(type)); \
} \
\
private:
// The C++ standard specifies that the nothrow allocation tag should live in the std namespace.
// Otherwise, `new (std::nothrow)` calls wouldn't get resolved.
namespace std { // NOLINT(cert-dcl58-cpp) These declarations must be in ::std and we are not using <new>
struct nothrow_t {
explicit nothrow_t() = default;
};
extern const nothrow_t nothrow;
enum class align_val_t : size_t {};
};
void kmalloc_init();
void kfree_sized(void*, size_t);
struct kmalloc_stats {
size_t bytes_allocated;
size_t bytes_free;
size_t kmalloc_call_count;
size_t kfree_call_count;
};
void get_kmalloc_stats(kmalloc_stats&);
extern bool g_dump_kmalloc_stacks;
inline void* operator new(size_t, void* p) { return p; }
inline void* operator new[](size_t, void* p) { return p; }
[[nodiscard]] void* operator new(size_t size);
[[nodiscard]] void* operator new(size_t size, std::nothrow_t const&) noexcept;
[[nodiscard]] void* operator new(size_t size, std::align_val_t);
[[nodiscard]] void* operator new(size_t size, std::align_val_t, std::nothrow_t const&) noexcept;
void operator delete(void* ptr) noexcept DISALLOW("All deletes in the kernel should have a known size.");
void operator delete(void* ptr, size_t) noexcept;
void operator delete(void* ptr, std::align_val_t) noexcept DISALLOW("All deletes in the kernel should have a known size.");
void operator delete(void* ptr, size_t, std::align_val_t) noexcept;
[[nodiscard]] void* operator new[](size_t size);
[[nodiscard]] void* operator new[](size_t size, std::nothrow_t const&) noexcept;
void operator delete[](void* ptrs) noexcept DISALLOW("All deletes in the kernel should have a known size.");
void operator delete[](void* ptr, size_t) noexcept;
[[gnu::malloc, gnu::alloc_size(1)]] void* kmalloc(size_t);
[[gnu::malloc, gnu::alloc_size(1, 2)]] void* kcalloc(size_t, size_t);
[[gnu::malloc, gnu::alloc_size(1), gnu::alloc_align(2)]] void* kmalloc_aligned(size_t size, size_t alignment);
size_t kmalloc_good_size(size_t);
void kmalloc_enable_expand();