46 lines
2.1 KiB
Markdown
46 lines
2.1 KiB
Markdown
# Memory System Status & Migration Plan
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## Completed Work
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### Core Systems
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- **MemoryArena**: Implemented linear allocator with alignment, markers, and reset support.
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- **Global Arenas**:
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- `ScratchArena` (64MB): Transient per-frame memory.
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- `EngineArena` (256MB): Persistent engine memory (internal).
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- `GameArena` (512MB): Persistent game memory (exported to Game DLL).
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- **Helpers**: Added `ArenaPushType<T>` and `ArenaPushArray<T>` with automatic zero-initialization.
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### Migrated Subsystems
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- **Display**: `Win32Window` and `Win32DisplayDevice` now use `EngineArena`.
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- **Game Entities**: `Entity.h` uses `GameArena` for entity allocation; manual `free` calls removed from `game.cpp`.
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- **Hot Reload**: `HotReload.cpp` (persistent paths to `EngineArena`) and `Win32HotReload.cpp` (temp paths to `ScratchArena`).
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## Remaining Work
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The following subsystems still use legacy `malloc`/`calloc`/`realloc`/`free` and need to be migrated.
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### IO System
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- **Files**: `Core/HAL/IO/IOStream.cpp`, `Core/HAL/IO/Win32/Win32IOStream.cpp`
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- **Allocations**: `IOStream` instance, data buffers, `Win32IOStreamDataPayload`.
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- **Challenge**: `Realloc` is used for growing buffers.
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- **Strategy**:
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- `IOStream` struct -> `ScratchArena` (if transient) or `EngineArena`.
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- Buffers: Evaluate if `ArenaPush` with large enough capacity is sufficient, or implement a growable buffer on top of arena (or use `std::vector` with custom allocator if absolutely needed, but prefer simple fixed max size if possible).
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### Graphics / Debug
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- **Files**: `Graphics/DebugDisplayRenderer.cpp`
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- **Allocations**: `DepthTestedVertices`, `OverlayVertices`.
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- **Strategy**: Use `EngineArena` or a dedicated `RenderArena` if these are persistent. If per-frame, move to `ScratchArena`.
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### Shader Compiler
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- **Files**: `JulietShaderCompiler/ShaderCompiler.cpp`
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- **Allocations**: Argument arrays, file buffers.
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- **Strategy**: Use `ScratchArena` for all compilation tasks as they are transient.
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### Filesystem
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- **Files**: `Core/HAL/Filesystem/Filesystem.cpp`
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- **Allocations**: `CachedBasePath`.
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- **Strategy**: Migrate to `EngineArena` (persistent).
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