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+# [RFC] SYCLBIN - A format for SYCL device code
+
+## Summary
+
+This RFC proposes the addition of SYCLBIN, a new binary format for storing SYCL device code. The format provides a lightweight, extensible wrapper around device modules and their corresponding SYCL-specific metadata to be produced/consumed by tools/SYCL runtime.
+
+## Purpose of this RFC
+
+This RFC seeks community feedback on the proposed SYCLBIN binary format design, including:
+
+- The binary format specification and layout
+- Toolchain integration approach and new compiler flags
+
+Community input is particularly valuable regarding potential integration challenges with existing LLVM offloading implementations.
+
+## Motivation and alternatives considered
+
+### Requirements: SYCL-Specific metadata and modules hierarchy
+
+The SYCL programming model requires device images to be accompanied by specific metadata necessary for SYCL runtime operation:
+
+1. Device target triple (e.g. ``spirv64_unknown_unknown``).
+2. Compiler and linker options for JIT compilation scenarios
+3. List of entry points exposed by each image
+4. Arrays of [property sets](https://github.com/intel/llvm/blob/sycl/sycl/doc/design/PropertySets.md).
+
+When a binary contains multiple images, some may share common metadata. Therefore, we require a hierarchical structure that enables metadata sharing while allowing specification of image-specific metadata.
+
+#### Existing Format Limitations:
+
+LLVM's offloading infrastructure supports several binary formats that can be embedded within the OffloadBinary format. However, these formats have various limitations that make them unsuitable for SYCL:
+
+- **Single-module design**: Formats like Object, Bitcode, CUBIN, PTX, and SPIRV are designed for single binary or single-module IR representation, lacking hierarchical structuring capabilities for multiple images/modules
+- **Missing SYCL metadata support**: None provide native support for SYCL-specific metadata requirements
+- **Vendor constraints**: Fatbinary is NVIDIA proprietary and incompatible with SYCL's vendor-neutral approach
+- **Limited container capabilities**: OffloadBinary is not designed for multiple device images or hierarchical organization, with StringData insufficient for complex metadata structures (like #3 and #4 above).
+
+### Abstraction: Simplifying Support in Offloading Tools
+
+Another motivation for adding the SYCLBIN format is to encapsulate SYCL-specific logic within SYCL-specific toolchain components (clang-sycl-linker, SYCL runtime) and isolate SYCL implementation details from general offloading tools designed to support multiple programming models.
+
+#### Current Workflow Without SYCLBIN:
+
+Without this format, metadata transfer from compiler to runtime requires the following complex workflow:
+
+1. **clang-sycl-linker** uses OffloadingImage's StringData (with workarounds) to store metadata items #1-#4
+2. **clang-linker-wrapper** opens OffloadingImage files from clang-sycl-linker and generates device image binary descriptors in a format readable by SYCL runtime
+- Problem: This requires clang-linker-wrapper to maintain SYCL-specific format knowledge, creating unnecessary code duplication
+3. **SYCL runtime** decodes metadata using this intermediate format
+
+#### Simplified Workflow With SYCLBIN:
+
+The SYCLBIN format enables a cleaner separation of concerns:
+
+1. **clang-sycl-linker** prepares a complete SYCLBIN containing all metadata and multiple images, embedding it as a single image within OffloadingImage
+2. **clang-linker-wrapper** generates only host register/unregister calls without needing knowledge of SYCLBIN internals
+3. **SYCL runtime** works directly with SYCLBIN format
+
+This approach eliminates the need for clang-linker-wrapper to understand SYCL-specific formats, reducing maintenance burden and improving toolchain modularity.
+
+### Enable modular dynamic loading of device binaries at runtime
+
+Some applications require dynamic loading of device binaries at runtime to achieve modularity and avoid recompiling the entire application when device code changes. The SYCLBIN format provides a standardized interface between compiler-produced binaries and runtime handling, enabling efficient dynamic loading scenarios.
+
+## Design
+
+### SYCLBIN binary format
+
+The SYCLBIN format consists of:
+
+- A [file header](#file-header) with magic number (0x53594249 "SYBI") and version information
+- Three lists of headers: the [abstract module header](#abstract-module-header) list, the
+[IR module header](#ir-module-header) list and
+[native device code image header](#native-device-code-image-header) list,
+containing information about the [abstract modules](#abstract-module),
+[IR modules](#ir-module) and
+[native device code images](#native-device-code-image) respectively.
+- Two byte tables containing metadata and binary data
+
+#### File Structure
+
+|                                                                       |
+| --------------------------------------------------------------------- |
+| [File header](#file-header)                                           |
+| [Abstract module header](#abstract-module-header) 1                   |
+| ...                                                                   |
+| [Abstract module header](#abstract-module-header) N                   |
+| [IR module header](#ir-module-header) 1                               |
+| ...                                                                   |
+| [IR module header](#ir-module-header) M                               |
+| [Native device code image header](#native-device-code-image-header) 1 |
+| ...                                                                   |
+| [Native device code image header](#native-device-code-image-header) L |
+| Metadata byte table                                                   |
+| Binary byte table                                                     |
+
+#### Key Components
+
+**Abstract Modules:** collection of device binaries that share properties,
+including, but not limited to: kernel names, imported symbols, exported symbols,
+aspect requirements, and specialization constants. The device binaries contained inside an abstract module must either be an IR
+module or a native device code image. IR modules contain device binaries in some
+known intermediate representation, such as SPIR-V, while the native device code
+images can be an architecture-specific binary format. There is no requirement
+that all device binaries in an abstract module are usable on the same device or
+are specific to a single vendor.
+
+**IR modules:** binary data for the corresponding module compiled to a
+given IR representation, identified by the IR type field.
+
+**Native device code images:** binary data for the corresponding
+module AOT compiled for a specific device, identified by the architecture
+string.
+
+**Byte tables:** A byte table contains dynamic data, such as metadata and binary blobs. The
+contents of it is generally referenced by an offset specified in the headers.
+
+Detailed design can be found [here](https://intel.github.io/llvm/design/SYCLBINDesign.html)
+
+## Toolchain integration
+
+The SYCLBIN content is embedded as an image within the [offload binary](https://github.com/llvm/llvm-project/blame/main/llvm/include/llvm/Object/OffloadBinary.h) produced by the [clang-sycl-linker](https://github.com/llvm/llvm-project/tree/main/clang/tools/clang-sycl-linker).
+
+### Clang driver changes
+
+- ``--sycl-link`` would trigger use of a SYCLBIN format in toolchain
+
+### clang-sycl-linker changes
+
+- [ ] to be updated...
+
+The clang-linker-wrapper is responsible for doing module-splitting, metadata
+extraction and linking of device binaries, as described in
+[OffloadDesign.md](OffloadDesign.md). However, to support SYCLBIN files, the
+clang-linker-wrapper must be able to unpack an offload binary (as described in
+[ClangOffloadPackager.rst](https://github.com/intel/llvm/blob/sycl/clang/docs/ClangOffloadPackager.rst))
+directly, instead of extracting it from a host binary. This should be done when
+a new flag, `--syclbin`, is passed. In this case, the clang-linker-wrapper is
+responsible to package the resulting device binaries and produced metadata into
+the format described in [SYCLBIN binary format section](#syclbin-binary-format).
+
+### clang-linker-wrapper changes
+
+- [ ] to be updated...
+
+Additionally, in this case the clang-linker-wrapper will skip the wrapping of
+the device code and the host code linking stage, as there is no host code to
+wrap the device code in and link.
+
+### SYCL runtime library changes
+
+- [ ] do we want to provide details in RFC or limit it to basic info?
+
+Using the interfaces from the
+[sycl_ext_oneapi_syclbin](../extensions/proposed/sycl_ext_oneapi_syclbin.asciidoc)
+extension, the runtime must be able to parse the SYCLBIN format, as described in
+the [SYCLBIN binary format section](#syclbin-binary-format). To avoid large
+amounts of code duplication, the runtime uses the implementation of SYCLBIN
+reading and writing implemented in LLVM.
+
+When creating a `kernel_bundle` from a SYCLBIN file, the runtime reads the
+contents of the SYCLBIN file and creates the corresponding data structure from
+it.
+
+- [ ] this part below needs to be rewritten I think....
+
+In order for the SYCL runtime library's existing logic to use the binaries,
+the runtime then creates a collection of `sycl_device_binary_struct` objects and
+its constituents, pointing to the data in the parsed SYCLBIN object. Passing
+these objects to the runtime library's `ProgramManager` allows it to reuse the
+logic for compiling, linking and building SYCL binaries.
+
+In the other direction, users can request the "contents" of a `kernel_bundle`.
+When this is done, the runtime library must ensure that a SYCLBIN file is
+available for the contents of the `kernel_bundle` and must then write the
+SYCLBIN object to the corresponding binary representation in the format
+described in the [SYCLBIN binary format section](#syclbin-binary-format). In cases
+where the `kernel_bundle` was created with a SYCLBIN file, the SYCLBIN
+representation is immediately available and can be serialized directly. In other
+cases, the runtime library creates a new SYCLBIN object from the binaries
+associated with the `kernel_bundle`, then serializes it and returns the result.
+
+## Versioning and Extensibility
+
+The SYCLBIN format is subject to change, but any such changes must come with an
+increment to the version number in the header.
+Additionally, any changes to the property set structure that affects the way the
+runtime has to parse the contained property sets will require an increase in the
+SYCLBIN version. Adding new property set names or new predefined properties only
+require a SYCLBIN version change if the the SYCLBIN consumer cannot safely
+ignore the property.
+
+## Upstreaming Plan
+
+- Phase 1: Upstream SYCLBIN format specification, including parsing/writing
+- Phase 2: Add clang driver, sycl-linker and linker-wrapper support
+- Phase 3: Integrate SYCLBIN support into SYCL runtime
+
+## Opens, common todos
+
+- [ ] Do we want to extend SYCL spec with SYCLBIN format? Do we want to somehow mention it in the RFC? Is it relevant?
+- [ ] Need to add/update links in this RFC
+- [ ] Polish formatting, fix typos, etc...