[slimtensor] Storage and SharedPtr for CPU owning mode#16548
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…inimal support Pull Request resolved: #16382 This diff introduces the foundational c10 core headers for SlimTensor, a lightweight tensor implementation used by torchnative, to cuda backend runtime and further it will be used by all aoti-driven backends like MPS. We add: - DeviceType.h - Device type enum (CPU only for now) - Device.h - Device class representing compute device location - ScalarType.h - Scalar type enum with elementSize() helper (Float only for now) These headers are modeled after PyTorch's c10 but simplified for our needs. The enum values are kept compatible with PyTorch for serialization compatibility. This is the first step in migrating SlimTensor to replace ETensor as the internal tensor representation in CUDA backend. Future diffs will add Storage, SlimTensor class, and additional dtypes/devices incrementally. ghstack-source-id: 332983719 @exported-using-ghexport Differential Revision: [D89747061](https://our.internmc.facebook.com/intern/diff/D89747061/)
Pull Request resolved: #16383 This diff introduces the foundation for tensor storage management in the SlimTensor migration: - util/SharedPtr.h - A lightweight, non-thread-safe shared pointer optimized for single-threaded tensor operations. - core/Storage.h - The MaybeOwningStorage class that manages tensor data memory: - DeviceTraits<CPU> specialization with allocate(), free(), memcpy() using malloc/free - Owning mode for CPU device (CUDA and non-owning mode added later) - Storage type alias as SharedPtr<MaybeOwningStorage> - Move semantics for efficient resource transfer - clone() and copy_() methods for data management ghstack-source-id: 332983720 @exported-using-ghexport Differential Revision: [D89747980](https://our.internmc.facebook.com/intern/diff/D89747980/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16548
Note: Links to docs will display an error until the docs builds have been completed. ⏳ 56 Pending, 1 Unrelated FailureAs of commit fc492d7 with merge base 9ba1b5d ( BROKEN TRUNK - The following job failed but were present on the merge base:👉 Rebase onto the `viable/strict` branch to avoid these failures
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #16383 by @Gasoonjia
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/74/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/74/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/gasoonjia/73/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/gasoonjia/74/orig
Differential Revision: D89747980
@diff-train-skip-merge