mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-21 15:10:19 +00:00
f87041bf3a
Resulting in a massive rename across almost everywhere! Alongside the namespace change, we now have the following names: * JS::NonnullGCPtr -> GC::Ref * JS::GCPtr -> GC::Ptr * JS::HeapFunction -> GC::Function * JS::CellImpl -> GC::Cell * JS::Handle -> GC::Root
64 lines
2.3 KiB
C++
64 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2020-2024, Andreas Kling <andreas@ladybird.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/NonnullOwnPtr.h>
|
|
#include <AK/Platform.h>
|
|
#include <LibGC/Heap.h>
|
|
#include <LibGC/HeapBlock.h>
|
|
#include <stdio.h>
|
|
#include <sys/mman.h>
|
|
|
|
#ifdef HAS_ADDRESS_SANITIZER
|
|
# include <sanitizer/asan_interface.h>
|
|
#endif
|
|
|
|
namespace GC {
|
|
|
|
size_t HeapBlockBase::block_size = PAGE_SIZE;
|
|
|
|
NonnullOwnPtr<HeapBlock> HeapBlock::create_with_cell_size(Heap& heap, CellAllocator& cell_allocator, size_t cell_size, [[maybe_unused]] char const* class_name)
|
|
{
|
|
char const* name = nullptr;
|
|
auto* block = static_cast<HeapBlock*>(cell_allocator.block_allocator().allocate_block(name));
|
|
new (block) HeapBlock(heap, cell_allocator, cell_size);
|
|
return NonnullOwnPtr<HeapBlock>(NonnullOwnPtr<HeapBlock>::Adopt, *block);
|
|
}
|
|
|
|
HeapBlock::HeapBlock(Heap& heap, CellAllocator& cell_allocator, size_t cell_size)
|
|
: HeapBlockBase(heap)
|
|
, m_cell_allocator(cell_allocator)
|
|
, m_cell_size(cell_size)
|
|
{
|
|
VERIFY(cell_size >= sizeof(FreelistEntry));
|
|
ASAN_POISON_MEMORY_REGION(m_storage, block_size - sizeof(HeapBlock));
|
|
}
|
|
|
|
void HeapBlock::deallocate(Cell* cell)
|
|
{
|
|
VERIFY(is_valid_cell_pointer(cell));
|
|
VERIFY(!m_freelist || is_valid_cell_pointer(m_freelist));
|
|
VERIFY(cell->state() == Cell::State::Live);
|
|
VERIFY(!cell->is_marked());
|
|
|
|
cell->~Cell();
|
|
auto* freelist_entry = new (cell) FreelistEntry();
|
|
freelist_entry->set_state(Cell::State::Dead);
|
|
freelist_entry->next = m_freelist;
|
|
m_freelist = freelist_entry;
|
|
|
|
#ifdef HAS_ADDRESS_SANITIZER
|
|
auto dword_after_freelist = round_up_to_power_of_two(reinterpret_cast<uintptr_t>(freelist_entry) + sizeof(FreelistEntry), 8);
|
|
VERIFY((dword_after_freelist - reinterpret_cast<uintptr_t>(freelist_entry)) <= m_cell_size);
|
|
VERIFY(m_cell_size >= sizeof(FreelistEntry));
|
|
// We can't poision the cell tracking data, nor the FreeListEntry's vtable or next pointer
|
|
// This means there's sizeof(FreelistEntry) data at the front of each cell that is always read/write
|
|
// On x86_64, this ends up being 24 bytes due to the size of the FreeListEntry's vtable, while on x86, it's only 12 bytes.
|
|
ASAN_POISON_MEMORY_REGION(reinterpret_cast<void*>(dword_after_freelist), m_cell_size - sizeof(FreelistEntry));
|
|
#endif
|
|
}
|
|
|
|
}
|