mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:12:43 +00:00
4fcc637e29
This macro inserts operator new/delete into a class, allowing you to very easily specify a specific heap alignment.
82 lines
3.2 KiB
C++
82 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Types.h>
|
|
#include <Kernel/Debug.h>
|
|
|
|
#define KMALLOC_SCRUB_BYTE 0xbb
|
|
#define KFREE_SCRUB_BYTE 0xaa
|
|
|
|
#define MAKE_ALIGNED_ALLOCATED(type, alignment) \
|
|
public: \
|
|
void* operator new(size_t) { return kmalloc_aligned<alignment>(sizeof(type)); } \
|
|
void operator delete(void* ptr) { kfree_aligned(ptr); } \
|
|
\
|
|
private:
|
|
|
|
void kmalloc_init();
|
|
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_impl(size_t);
|
|
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_eternal(size_t);
|
|
|
|
void* krealloc(void*, size_t);
|
|
void kfree(void*);
|
|
|
|
struct kmalloc_stats {
|
|
size_t bytes_allocated;
|
|
size_t bytes_free;
|
|
size_t bytes_eternal;
|
|
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; }
|
|
|
|
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc(size_t);
|
|
|
|
template<size_t ALIGNMENT>
|
|
[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] inline void* kmalloc_aligned(size_t size)
|
|
{
|
|
static_assert(ALIGNMENT > sizeof(ptrdiff_t));
|
|
static_assert(ALIGNMENT <= 4096);
|
|
void* ptr = kmalloc(size + ALIGNMENT + sizeof(ptrdiff_t));
|
|
size_t max_addr = (size_t)ptr + ALIGNMENT;
|
|
void* aligned_ptr = (void*)(max_addr - (max_addr % ALIGNMENT));
|
|
((ptrdiff_t*)aligned_ptr)[-1] = (ptrdiff_t)((u8*)aligned_ptr - (u8*)ptr);
|
|
return aligned_ptr;
|
|
}
|
|
|
|
inline void kfree_aligned(void* ptr)
|
|
{
|
|
kfree((u8*)ptr - ((const ptrdiff_t*)ptr)[-1]);
|
|
}
|
|
|
|
void kmalloc_enable_expand();
|