mirror of
https://github.com/RGBCube/serenity
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828441852f
Now that we have OS macros for essentially every supported OS, let's try to use them everywhere.
80 lines
2 KiB
C++
80 lines
2 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Platform.h>
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#include <AK/Random.h>
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#include <AK/Vector.h>
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#include <LibJS/Heap/BlockAllocator.h>
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#include <LibJS/Heap/HeapBlock.h>
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#include <sys/mman.h>
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#ifdef HAS_ADDRESS_SANITIZER
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# include <sanitizer/asan_interface.h>
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#endif
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namespace JS {
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BlockAllocator::~BlockAllocator()
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{
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for (auto* block : m_blocks) {
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ASAN_UNPOISON_MEMORY_REGION(block, HeapBlock::block_size);
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#ifdef AK_OS_SERENITY
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if (munmap(block, HeapBlock::block_size) < 0) {
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perror("munmap");
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VERIFY_NOT_REACHED();
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}
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#else
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free(block);
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#endif
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}
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}
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void* BlockAllocator::allocate_block([[maybe_unused]] char const* name)
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{
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if (!m_blocks.is_empty()) {
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// To reduce predictability, take a random block from the cache.
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size_t random_index = get_random_uniform(m_blocks.size());
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auto* block = m_blocks.unstable_take(random_index);
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ASAN_UNPOISON_MEMORY_REGION(block, HeapBlock::block_size);
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#ifdef AK_OS_SERENITY
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if (set_mmap_name(block, HeapBlock::block_size, name) < 0) {
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perror("set_mmap_name");
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VERIFY_NOT_REACHED();
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}
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#endif
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return block;
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}
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#ifdef AK_OS_SERENITY
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auto* block = (HeapBlock*)serenity_mmap(nullptr, HeapBlock::block_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_RANDOMIZED | MAP_PRIVATE, 0, 0, HeapBlock::block_size, name);
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VERIFY(block != MAP_FAILED);
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#else
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auto* block = (HeapBlock*)aligned_alloc(HeapBlock::block_size, HeapBlock::block_size);
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VERIFY(block);
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#endif
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return block;
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}
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void BlockAllocator::deallocate_block(void* block)
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{
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VERIFY(block);
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if (m_blocks.size() >= max_cached_blocks) {
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#ifdef AK_OS_SERENITY
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if (munmap(block, HeapBlock::block_size) < 0) {
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perror("munmap");
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VERIFY_NOT_REACHED();
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}
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#else
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free(block);
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#endif
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return;
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}
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ASAN_POISON_MEMORY_REGION(block, HeapBlock::block_size);
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m_blocks.append(block);
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}
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}
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