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Diffstat (limited to 'third_party/bazel/rules_haskell/haskell/providers.bzl')
| -rw-r--r-- | third_party/bazel/rules_haskell/haskell/providers.bzl | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/third_party/bazel/rules_haskell/haskell/providers.bzl b/third_party/bazel/rules_haskell/haskell/providers.bzl new file mode 100644 index 000000000000..2b70ec2e8700 --- /dev/null +++ b/third_party/bazel/rules_haskell/haskell/providers.bzl @@ -0,0 +1,234 @@ +"""Providers exposed by the Haskell rules.""" + +load( + ":private/path_utils.bzl", + "darwin_convert_to_dylibs", + "make_path", + "windows_convert_to_dlls", +) + +HaskellCcInfo = provider( + doc = "Haskell cc dependency information. Part of HaskellInfo.", + fields = { + "static_linking": """static linking mode parameters. + A struct of + (libraries_to_link, dynamic_libraries_for_runtime, user_link_flags). + Libraries in libraries_to_link are struct(lib, mangled_lib) + because the Darwin linker needs the original library path, + while the Linux linker needs the mangled path. + """, + "dynamic_linking": """static linking mode parameters. + A struct of + (libraries_to_link, dynamic_libraries_for_runtime, user_link_flags). + Libraries in libraries_to_link are struct(lib, mangled_lib) + because the Darwin linker needs the original library path, + while the Linux linker needs the mangled path. + """, + }, +) + +def empty_HaskellCcInfo(): + return HaskellCcInfo( + static_linking = struct( + libraries_to_link = depset(order = "topological"), + dynamic_libraries_for_runtime = depset(order = "topological"), + user_link_flags = depset(order = "topological"), + ), + dynamic_linking = struct( + libraries_to_link = depset(order = "topological"), + dynamic_libraries_for_runtime = depset(order = "topological"), + user_link_flags = depset(order = "topological"), + ), + ) + +def merge_HaskellCcInfo(*args): + return HaskellCcInfo( + static_linking = struct( + libraries_to_link = depset( + order = "topological", + transitive = [arg.static_linking.libraries_to_link for arg in args], + ), + dynamic_libraries_for_runtime = depset( + order = "topological", + transitive = [arg.static_linking.dynamic_libraries_for_runtime for arg in args], + ), + user_link_flags = depset( + order = "topological", + transitive = [arg.static_linking.user_link_flags for arg in args], + ), + ), + dynamic_linking = struct( + libraries_to_link = depset( + order = "topological", + transitive = [arg.dynamic_linking.libraries_to_link for arg in args], + ), + dynamic_libraries_for_runtime = depset( + order = "topological", + transitive = [arg.dynamic_linking.dynamic_libraries_for_runtime for arg in args], + ), + user_link_flags = depset( + order = "topological", + transitive = [arg.dynamic_linking.user_link_flags for arg in args], + ), + ), + ) + +HaskellInfo = provider( + doc = "Common information about build process: dependencies, etc.", + fields = { + "package_ids": "Set of all package ids of direct (non-prebuilt) dependencies.", + "package_databases": "Set of package cache files.", + "version_macros": "Set of version macro files.", + "import_dirs": "Import hierarchy roots.", + "source_files": "Set of files that contain Haskell modules.", + "extra_source_files": "A depset of non-Haskell source files.", + "static_libraries": "Ordered collection of compiled library archives.", + "static_libraries_prof": "Ordered collection of static libraries with profiling.", + "dynamic_libraries": "Set of dynamic libraries.", + "interface_dirs": "Set of interface dirs belonging to the packages.", + "compile_flags": "Arguments that were used to compile the code.", + "prebuilt_dependencies": "Transitive collection of info of wired-in Haskell dependencies.", + "direct_prebuilt_deps": "Set of info of direct prebuilt dependencies.", + "cc_dependencies": "Direct cc library dependencies. See HaskellCcInfo.", + "transitive_cc_dependencies": "Transitive cc library dependencies. See HaskellCcInfo.", + }, +) + +def get_libs_for_ghc_linker(hs, transitive_cc_dependencies, path_prefix = None): + """Return all C library dependencies for GHC's linker. + + GHC has it's own builtin linker. It is used for Template Haskell, for GHCi, + during doctests, etc. GHC's linker differs from the system's dynamic linker + in some ways. E.g. it strictly assumes that dynamic libraries end on .dylib + on MacOS. + + This function returns a list of all transitive C library dependencies + (static or dynamic), taking the requirements of GHC's linker into account. + + Args: + hs: Haskell context. + transitive_cc_dependencies: HaskellCcInfo provider. + path_prefix: Prefix for paths in GHC environment variables. + + Returns: + (library_deps, ld_library_deps, env) + library_deps: List of library files suitable for GHC's builtin linker. + ld_library_deps: List of library files that should be available for + dynamic loading. + env: A mapping environment variables LIBRARY_PATH and LD_LIBRARY_PATH, + to the corresponding values as expected by GHC. + """ + trans_link_ctx = transitive_cc_dependencies.dynamic_linking + + libs_to_link = trans_link_ctx.libraries_to_link.to_list() + libs_for_runtime = trans_link_ctx.dynamic_libraries_for_runtime.to_list() + + _library_deps = libs_to_link + _ld_library_deps = libs_for_runtime + if hs.toolchain.is_darwin: + # GHC's builtin linker requires .dylib files on MacOS. + library_deps = darwin_convert_to_dylibs(hs, _library_deps) + + # Additionally ghc 8.4 requires library_deps here although 8.6 does not + ld_library_deps = library_deps + _ld_library_deps + elif hs.toolchain.is_windows: + # GHC's builtin linker requires .dll files on Windows. + library_deps = windows_convert_to_dlls(hs, _library_deps) + + # copied over from Darwin 5 lines above + ld_library_deps = library_deps + _ld_library_deps + else: + library_deps = _library_deps + ld_library_deps = _ld_library_deps + + sep = ";" if hs.toolchain.is_windows else None + + library_path = make_path( + library_deps, + prefix = path_prefix, + sep = sep, + ) + ld_library_path = make_path( + ld_library_deps, + prefix = path_prefix, + sep = sep, + ) + + # GHC's builtin linker/loader looks for libraries in the paths defined by + # LIBRARY_PATH and LD_LIBRARY_PATH. + # See https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ghci.html?highlight=library_path#extra-libraries + # In certain cases it is not enough to specify LD_LIBRARY_PATH alone, and + # libraries are only found if their path is included in LIBRARY_PATH. + # See https://github.com/tweag/rules_haskell/pull/685 + env = { + "LIBRARY_PATH": library_path, + "LD_LIBRARY_PATH": ld_library_path, + } + + return (library_deps, ld_library_deps, env) + +HaskellLibraryInfo = provider( + doc = "Library-specific information.", + fields = { + "package_id": "Workspace unique package identifier.", + "version": "Package version.", + }, +) + +HaskellCoverageInfo = provider( + doc = "Information about coverage instrumentation for Haskell files.", + fields = { + "coverage_data": "A list of coverage data containing which parts of Haskell source code are being tracked for code coverage.", + }, +) + +HaskellPrebuiltPackageInfo = provider( + doc = "Information about a prebuilt GHC package.", + fields = { + "package": "Package name", + "id_file": "File containing package id", + "version_macros_file": "C header file containing Cabal version macros", + }, +) + +HaddockInfo = provider( + doc = "Haddock information.", + fields = { + "package_id": "Package id, usually of the form name-version.", + "transitive_html": "Dictionary from package id to html dirs.", + "transitive_haddocks": "Dictionary from package id to Haddock files.", + }, +) + +HaskellLintInfo = provider( + doc = "Provider that collects files produced by linters", + fields = { + "outputs": "Set of linter log files.", + }, +) + +HaskellProtobufInfo = provider( + doc = "Provider that wraps providers of auto-generated Haskell libraries", + fields = { + "files": "files", + }, +) + +C2hsLibraryInfo = provider( + doc = "Information about c2hs dependencies.", + fields = { + "chi_file": "c2hs interface file", + "import_dir": "Import directory containing generated Haskell source file.", + }, +) + +GhcPluginInfo = provider( + doc = "Encapsulates GHC plugin dependencies and tools", + fields = { + "module": "Plugin entrypoint.", + "deps": "Plugin dependencies.", + "args": "Plugin options.", + "tool_inputs": "Inputs required for plugin tools.", + "tool_input_manifests": "Plugin tools input manifests.", + }, +) |