Andreas Kling a25fc5ad8a LibCore+LibWeb: Add ScopedAutoreleasePool and use it on macOS ...

On macOS, Objective-C methods frequently return autoreleased objects
that accumulate until an autorelease pool is drained. Our event loop
(Core::EventLoop) and rendering thread both lacked autorelease pools,
causing unbounded accumulation of autoreleased objects.

The rendering thread was the worst offender: every Skia flush triggers
Metal resource allocation which sets labels on GPU textures via
-[IOGPUMetalResource setLabel:], creating autoreleased CFData objects.
With ~1M+ such objects at 112 bytes each, this leaked ~121MB. Metal
command buffer objects (_MTLCommandBufferEncoderInfo, etc.) also
accumulated, adding another ~128MB.

Add Core::ScopedAutoreleasePool, a RAII wrapper around the ObjC runtime
autorelease pool (no-op on non-macOS), and drain it:
- Every event loop pump (like NSRunLoop does)
- Every compositor loop iteration on the rendering thread

2026-03-15 11:42:43 +01:00

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