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UserspaceEmulator: Avoid one hash lookup in target_did_malloc()

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This commit is contained in:
Andreas Kling 2020-11-14 18:38:39 +01:00
parent d88b36448b
commit 2066f48b87
Notes: sideshowbarker 2024-07-19 01:23:35 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/2066f48b875
1 changed files with 7 additions and 5 deletions
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12
DevTools/UserspaceEmulator/MallocTracer.cpp
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@ -64,20 +64,22 @@ void MallocTracer::target_did_malloc(Badge<SoftCPU>, FlatPtr address, size_t siz
if (size <= size_classes[num_size_classes - 1]) {
FlatPtr chunked_block_address = address & ChunkedBlock::block_mask;
// FIXME: Don't do a double hash lookup here.
TrackedChunkedBlock* block = nullptr;
auto tracked_chunked_block = m_chunked_blocks.get(chunked_block_address);
if (!tracked_chunked_block.has_value()) {
m_chunked_blocks.set(chunked_block_address, make<TrackedChunkedBlock>());
auto new_block = make<TrackedChunkedBlock>();
block = new_block.ptr();
m_chunked_blocks.set(chunked_block_address, move(new_block));
tracked_chunked_block = m_chunked_blocks.get(chunked_block_address);
auto& block = const_cast<TrackedChunkedBlock&>(*tracked_chunked_block.value());
block.address = chunked_block_address;
block.chunk_size = mmap_region.read32(offsetof(CommonHeader, m_size)).value();
block.mallocations.resize((ChunkedBlock::block_size - sizeof(ChunkedBlock)) / block.chunk_size);
dbgln("Tracking ChunkedBlock @ {:p} with chunk_size={}, chunk_count={}", block.address, block.chunk_size, block.mallocations.size());
} else {
block = const_cast<TrackedChunkedBlock*>(tracked_chunked_block.value());
}
ASSERT(tracked_chunked_block.has_value());
auto& block = const_cast<TrackedChunkedBlock&>(*tracked_chunked_block.value());
block.mallocation_for_address(address) = { address, size, true, false, Emulator::the().raw_backtrace(), Vector<FlatPtr>() };
block->mallocation_for_address(address) = { address, size, true, false, Emulator::the().raw_backtrace(), Vector<FlatPtr>() };
} else {
m_big_mallocations.append({ address, size, true, false, Emulator::the().raw_backtrace(), Vector<FlatPtr>() });
}