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UserspaceEmulator: Hang malloc metadata on malloc block MmapRegions

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Instead of tracking known malloc blocks in a separate hash table,
add an optional malloc metadata pointer to MmapRegion.

This makes finding the malloc metadata for a given pointer extremely
fast since it can piggyback on the page table array. :^)
This commit is contained in:
Andreas Kling 2020-11-16 09:33:30 +01:00
parent 395313039d
commit f41b9946e2
4 changed files with 77 additions and 83 deletions
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8
DevTools/UserspaceEmulator/MmapRegion.h
View file

@ -31,6 +31,9 @@
namespace UserspaceEmulator {
class MallocRegionMetadata;
class MallocTracer;
class MmapRegion final : public SoftMMU::Region {
public:
static NonnullOwnPtr<MmapRegion> create_anonymous(u32 base, u32 size, u32 prot);
@ -59,6 +62,9 @@ public:
void set_prot(int prot) { m_prot = prot; }
MallocRegionMetadata* malloc_metadata() { return m_malloc_metadata; }
void set_malloc_metadata(Badge<MallocTracer>, NonnullOwnPtr<MallocRegionMetadata> metadata) { m_malloc_metadata = move(metadata); }
private:
MmapRegion(u32 base, u32 size, int prot);
virtual bool is_mmap() const override { return true; }
@ -68,6 +74,8 @@ private:
int m_prot { 0 };
bool m_file_backed { false };
bool m_malloc { false };
OwnPtr<MallocRegionMetadata> m_malloc_metadata;
};
}