Add class-local allocation macros for operator new/delete through AK's
malloc helpers. The macros can optionally choose a HeapPartition.
Add Layout and Painting partitions, plus basic partition stats helpers.
Use the new partitions for LibWeb layout and painting object hierarchies
and layout-state side data.
Add a string heap partition and route long AK string backing
allocations through it.
Give StringBuilder partition-aware outlined storage so adopted String
and Utf16String buffers are allocated from the string heap. Keep the
string heap thread-local because mimalloc heaps may only allocate from
their creating thread, while cross-thread frees are handled by mimalloc.
Add a JSObjectStorage heap partition and route heap-backed property
storage (both named and indexed element buffers) through it.
These buffers are directly shaped by script-visible object and array
operations, so keeping them separate from the general heap makes a
corruption primitive less useful against unrelated allocations.
Move owned ArrayBuffer and SharedArrayBuffer data blocks into the
ArrayBuffer heap partition. Keep unowned and host storage explicit, so
Wasm memory and external LibWeb buffers stay outside this partition.
Introduce DataBlock::OwnedBackingStore as the LibJS-owned byte storage
representation. Expose byte spans instead of a ByteBuffer object, giving
ArrayBuffer one allocation boundary that can later grow toward guarded
or caged storage.
Let callers that need ByteBuffer data copy from backing-store bytes.
Keep TransferArrayBuffer zero-copy by moving the DataBlock directly
instead of materializing a ByteBuffer in between.
Update the Wasm typed-array test helper to compare viewed byte ranges
after ArrayBuffer stops exposing ByteBuffer identity.
Introduce HeapPartition and overload kmalloc and krealloc so allocation
sites can opt into a specific heap partition. Keep the default allocator
API unchanged. The only initial partition is General, which maps to the
regular allocator path.
Keep sanitizer builds on the system allocator so LeakSanitizer can still
trace AK container allocations. Remove the obsolete Serenity-specific
allocator branch while updating this file.
Use mimalloc for Ladybird-owned allocations without overriding malloc().
Route kmalloc(), kcalloc(), krealloc(), and kfree() through mimalloc,
and put the embedded Rust crates on the same allocator via a shared
shim in AK/kmalloc.cpp.
This also lets us drop kfree_sized(), since it no longer used its size
argument. StringData, Utf16StringData, JS object storage, Rust error
strings, and the CoreAudio playback helpers can all free their AK-backed
storage with plain kfree().
Sanitizer builds still use the system allocator. LeakSanitizer does not
reliably trace references stored in mimalloc-managed AK containers, so
static caches and other long-lived roots can look leaked. Pass the old
size into the Rust realloc shim so aligned fallback reallocations can
move posix_memalign-backed blocks safely.
Static builds still need a little linker help. macOS app binaries need
the Rust allocator entry points forced in from liblagom-ak.a, while
static ELF links can pull in identical allocator shim definitions from
multiple Rust staticlibs. Keep the Apple -u flags and allow those
duplicate shim symbols for LibJS and LibRegex links on Linux and BSD.
These changes are compatible with clang-format 16 and will be mandatory
when we eventually bump clang-format version. So, since there are no
real downsides, let's commit them now.
This fixes a build issue introduced in 23d66fe, where the compiler
statically detected that that mismatching new and delete operators were
used.
Clang generates a warning for this, for the reasons described in the
comment in `AK/kmalloc.cpp`, but GCC does not.
Besides moving the allocator functions into a `.cpp` file, declarations
in `AK/kmalloc.cpp` were reordered to have imports at the top, in order
to make the code more readable.
Cooperate with the compiler to generate and execute the _init_array list
of constructor functions on userspace program statup. This took two days
to get working, my goodness. :^)
