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[Offload] Add Sphinx HTML documentation target
Introduces the `docs-offload-html` target when CMake is configured with `LLVM_ENABLE_SPHINX=ON` and `SPHINX_OUTPUT_HTML=ON`. Utilized `offload-tblgen -gen-spen` to generate Offload API specification docs.
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‎offload/CMakeLists.txt

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@@ -23,6 +23,8 @@ elseif(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
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return()
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endif()
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set(OFFLOAD_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
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if(OPENMP_STANDALONE_BUILD)
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set(OFFLOAD_LIBDIR_SUFFIX "" CACHE STRING
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"Suffix of lib installation directory, e.g. 64 => lib64")
@@ -371,6 +373,7 @@ add_subdirectory(tools/offload-tblgen)
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add_subdirectory(plugins-nextgen)
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add_subdirectory(DeviceRTL)
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add_subdirectory(tools)
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add_subdirectory(docs)
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# Build target agnostic offloading library.
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add_subdirectory(libomptarget)

‎offload/docs/.gitignore

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_static/
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_themes/
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offload-api.rst

‎offload/docs/CMakeLists.txt

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if(LLVM_ENABLE_SPHINX)
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include(AddSphinxTarget)
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if(SPHINX_FOUND AND SPHINX_OUTPUT_HTML)
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# Generate offload-api.rst from OffloadAPI.td
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set(LLVM_TARGET_DEFINITIONS
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${OFFLOAD_SOURCE_DIR}/liboffload/API/OffloadAPI.td)
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tablegen(OFFLOAD source/offload-api.rst -gen-spec
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EXTRA_INCLUDES ${OFFLOAD_SOURCE_DIR}/liboffload/API)
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add_public_tablegen_target(OffloadDocsGenerate)
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# Due to Sphinx only allowing a single source direcotry and the fact we
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# only generate a single file, copy offload-api.rst to the source directory
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# to be included in the generated documentation.
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# Additionally, copy the llvm-theme into the Sphinx source directory.
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# A .gitignore file ensures the copied files will not be added to the
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# repository.
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add_custom_target(OffloadDocsCopy
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COMMAND ${CMAKE_COMMAND} -E copy
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${CMAKE_CURRENT_BINARY_DIR}/source/offload-api.rst
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${CMAKE_CURRENT_SOURCE_DIR}/offload-api.rst
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COMMAND ${CMAKE_COMMAND} -E copy
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${OFFLOAD_SOURCE_DIR}/../clang/www/favicon.ico
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${CMAKE_CURRENT_SOURCE_DIR}/_static/favicon.ico
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COMMAND ${CMAKE_COMMAND} -E copy
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${OFFLOAD_SOURCE_DIR}/../llvm/docs/_static/llvm.css
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${CMAKE_CURRENT_SOURCE_DIR}/_static/llvm.css
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COMMAND ${CMAKE_COMMAND} -E copy_directory
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${OFFLOAD_SOURCE_DIR}/../llvm/docs/_themes
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${CMAKE_CURRENT_SOURCE_DIR}/_themes
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)
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add_dependencies(OffloadDocsCopy OffloadDocsGenerate)
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# Generate the HTML documentation, the docs-offload-html target.
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add_sphinx_target(html offload)
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add_dependencies(docs-offload-html OffloadDocsCopy)
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endif()
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endif()

‎offload/docs/conf.py

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# Configuration file for the Sphinx documentation builder.
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#
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# For the full list of built-in configuration values, see the documentation:
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# https://www.sphinx-doc.org/en/master/usage/configuration.html
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# -- Project information -----------------------------------------------------
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# https://www.sphinx-doc.org/en/master/usage/configuration.html#project-information
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project = "Offload"
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copyright = "2025, LLVM project"
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author = "LLVM project"
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# -- General configuration ---------------------------------------------------
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# https://www.sphinx-doc.org/en/master/usage/configuration.html#general-configuration
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extensions = []
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templates_path = ["_templates"]
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exclude_patterns = []
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# -- C domain configuration --------------------------------------------------
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# https://www.sphinx-doc.org/en/master/usage/configuration.html#c-config
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c_maximum_signature_line_length = 60
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# -- Options for HTML output -------------------------------------------------
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# https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
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html_theme = "llvm-theme"
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html_theme_path = ["_themes"]
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html_static_path = ["_static"]
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html_favicon = "_static/favicon.ico"

‎offload/docs/index.rst

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.. Offload documentation master file, created by
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sphinx-quickstart on Fri Jul 4 14:59:13 2025.
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You can adapt this file completely to your liking, but it should at least
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contain the root `toctree` directive.
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Welcome to Offload's documentation!
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===================================
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.. toctree::
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:maxdepth: 2
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:caption: Contents:
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offload-api
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Indices and tables
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==================
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* :ref:`genindex`
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* :ref:`modindex`
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* :ref:`search`

‎offload/liboffload/API/Common.td

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let alt_value = "";
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}
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def : Macro {
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let name = "OL_DLLEXPORT";
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let desc = "Microsoft-specific dllexport storage-class attribute";
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let condition = "defined(_WIN32)";
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let value = "__declspec(dllexport)";
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}
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def : Macro {
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let name = "OL_DLLEXPORT";
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let desc = "GCC-specific dllexport storage-class attribute";
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let condition = "__GNUC__ >= 4";
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let value = "__attribute__ ((visibility (\"default\")))";
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let alt_value = "";
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}
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def : Handle {
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let name = "ol_platform_handle_t";
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let desc = "Handle of a platform instance";

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