// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.devtools.build.lib.skylarkbuildapi.cpp;

import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.skylarkbuildapi.FileApi;
import com.google.devtools.build.lib.skylarkbuildapi.ProviderApi;
import com.google.devtools.build.lib.skylarkbuildapi.SkylarkActionFactoryApi;
import com.google.devtools.build.lib.skylarkbuildapi.SkylarkRuleContextApi;
import com.google.devtools.build.lib.skylarkinterface.Param;
import com.google.devtools.build.lib.skylarkinterface.ParamType;
import com.google.devtools.build.lib.skylarkinterface.SkylarkCallable;
import com.google.devtools.build.lib.skylarkinterface.SkylarkModule;
import com.google.devtools.build.lib.skylarkinterface.StarlarkContext;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.Runtime.NoneType;
import com.google.devtools.build.lib.syntax.SkylarkDict;
import com.google.devtools.build.lib.syntax.SkylarkList;
import com.google.devtools.build.lib.syntax.SkylarkList.Tuple;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;

/** Utilites related to C++ support. */
@SkylarkModule(
    name = "cc_common",
    doc = "Utilities for C++ compilation, linking, and command line generation.")
public interface CcModuleApi<
    SkylarkActionFactoryT extends SkylarkActionFactoryApi,
    FileT extends FileApi,
    CcToolchainProviderT extends CcToolchainProviderApi,
    FeatureConfigurationT extends FeatureConfigurationApi,
    CompilationContextT extends CcCompilationContextApi,
    LinkingContextT extends CcLinkingContextApi,
    LibraryToLinkT extends LibraryToLinkApi,
    CcToolchainVariablesT extends CcToolchainVariablesApi,
    SkylarkRuleContextT extends SkylarkRuleContextApi,
    CcToolchainConfigInfoT extends CcToolchainConfigInfoApi,
    CompilationOutputsT extends CcCompilationOutputsApi<FileT>> {

  @SkylarkCallable(
      name = "CcToolchainInfo",
      doc =
          "The key used to retrieve the provider that contains information about the C++ "
              + "toolchain being used",
      structField = true)
  ProviderApi getCcToolchainProvider();

  @Deprecated
  @SkylarkCallable(
      name = "do_not_use_tools_cpp_compiler_present",
      doc =
          "Do not use this field, its only puprose is to help with migration from "
              + "config_setting.values{'compiler') to "
              + "config_settings.flag_values{'@bazel_tools//tools/cpp:compiler'}",
      structField = true)
  default void compilerFlagExists() {}

  @SkylarkCallable(
      name = "configure_features",
      doc = "Creates a feature_configuration instance.",
      parameters = {
        @Param(
            name = "ctx",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = SkylarkRuleContextApi.class,
            doc = "The rule context."),
        @Param(
            name = "cc_toolchain",
            doc = "cc_toolchain for which we configure features.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class),
        @Param(
            name = "requested_features",
            doc = "List of features to be enabled.",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class),
        @Param(
            name = "unsupported_features",
            doc = "List of features that are unsupported by the current rule.",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class),
      })
  FeatureConfigurationT configureFeatures(
      Object ruleContextOrNone,
      CcToolchainProviderT toolchain,
      SkylarkList<String> requestedFeatures,
      SkylarkList<String> unsupportedFeatures)
      throws EvalException;

  @SkylarkCallable(
      name = "get_tool_for_action",
      doc = "Returns tool path for given action.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "action_name",
            doc =
                "Name of the action. Has to be one of the names in "
                    + "@bazel_tools//tools/build_defs/cc:action_names.bzl "
                    + "(https://github.com/bazelbuild/bazel/blob/master/tools/build_defs/cc/"
                    + "action_names.bzl)",
            named = true,
            positional = false),
      })
  String getToolForAction(FeatureConfigurationT featureConfiguration, String actionName);

  @SkylarkCallable(
      name = "get_execution_requirements",
      doc = "Returns execution requirements for given action.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "action_name",
            doc =
                "Name of the action. Has to be one of the names in "
                    + "@bazel_tools//tools/build_defs/cc:action_names.bzl "
                    + "(https://github.com/bazelbuild/bazel/blob/master/tools/build_defs/cc/"
                    + "action_names.bzl)",
            named = true,
            positional = false),
      })
  SkylarkList<String> getExecutionRequirements(
      FeatureConfigurationT featureConfiguration, String actionName);

  @SkylarkCallable(
      name = "is_enabled",
      doc = "Returns True if given feature is enabled in the feature configuration.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "feature_name",
            doc = "Name of the feature.",
            named = true,
            positional = false),
      })
  boolean isEnabled(FeatureConfigurationT featureConfiguration, String featureName);

  @SkylarkCallable(
      name = "action_is_enabled",
      doc = "Returns True if given action_config is enabled in the feature configuration.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "action_name",
            doc = "Name of the action_config.",
            named = true,
            positional = false),
      })
  boolean actionIsEnabled(FeatureConfigurationT featureConfiguration, String actionName);

  @SkylarkCallable(
      name = "get_memory_inefficient_command_line",
      doc =
          "Returns flattened command line flags for given action, using given variables for "
              + "expansion. Flattens nested sets and ideally should not be used, or at least "
              + "should not outlive analysis. Work on memory efficient function returning Args is "
              + "ongoing.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "action_name",
            doc =
                "Name of the action. Has to be one of the names in "
                    + "@bazel_tools//tools/build_defs/cc:action_names.bzl "
                    + "(https://github.com/bazelbuild/bazel/blob/master/tools/build_defs/cc/"
                    + "action_names.bzl)",
            named = true,
            positional = false),
        @Param(
            name = "variables",
            doc = "Build variables to be used for template expansions.",
            named = true,
            positional = false,
            type = CcToolchainVariablesApi.class),
      })
  SkylarkList<String> getCommandLine(
      FeatureConfigurationT featureConfiguration,
      String actionName,
      CcToolchainVariablesT variables)
      throws EvalException;

  @SkylarkCallable(
      name = "get_environment_variables",
      doc = "Returns environment variables to be set for given action.",
      parameters = {
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "action_name",
            doc =
                "Name of the action. Has to be one of the names in "
                    + "@bazel_tools//tools/build_defs/cc:action_names.bzl "
                    + "(https://github.com/bazelbuild/bazel/blob/master/tools/build_defs/cc/"
                    + "action_names.bzl)",
            named = true,
            positional = false),
        @Param(
            name = "variables",
            doc = "Build variables to be used for template expansion.",
            positional = false,
            named = true,
            type = CcToolchainVariablesApi.class),
      })
  SkylarkDict<String, String> getEnvironmentVariable(
      FeatureConfigurationT featureConfiguration,
      String actionName,
      CcToolchainVariablesT variables)
      throws EvalException;

  @SkylarkCallable(
      name = "create_compile_variables",
      doc = "Returns variables used for compilation actions.",
      parameters = {
        @Param(
            name = "cc_toolchain",
            doc = "cc_toolchain for which we are creating build variables.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class),
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "source_file",
            doc =
                "Optional source file for the compilation. Please prefer passing source_file here "
                    + "over appending it to the end of the command line generated from "
                    + "cc_common.get_memory_inefficient_command_line, as then it's in the power of "
                    + "the toolchain author to properly specify and position compiler flags.",
            named = true,
            positional = false,
            defaultValue = "None",
            noneable = true),
        @Param(
            name = "output_file",
            doc =
                "Optional output file of the compilation. Please prefer passing output_file here "
                    + "over appending it to the end of the command line generated from "
                    + "cc_common.get_memory_inefficient_command_line, as then it's in the power of "
                    + "the toolchain author to properly specify and position compiler flags.",
            named = true,
            positional = false,
            defaultValue = "None",
            noneable = true),
        @Param(
            name = "user_compile_flags",
            doc = "List of additional compilation flags (copts).",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkList.class),
            }),
        @Param(
            name = "include_directories",
            doc = "Depset of include directories.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "quote_include_directories",
            doc = "Depset of quote include directories.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "system_include_directories",
            doc = "Depset of system include directories.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "framework_include_directories",
            doc = "Depset of framework include directories.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "preprocessor_defines",
            doc = "Depset of preprocessor defines.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "use_pic",
            doc = "When true the compilation will generate position independent code.",
            positional = false,
            named = true,
            defaultValue = "False"),
        // TODO(b/65151735): Remove once we migrate crosstools to features
        @Param(
            name = "add_legacy_cxx_options",
            doc = "Unused.",
            named = true,
            positional = false,
            defaultValue = "False")
      })
  CcToolchainVariablesT getCompileBuildVariables(
      CcToolchainProviderT ccToolchainProvider,
      FeatureConfigurationT featureConfiguration,
      Object sourceFile,
      Object outputFile,
      Object userCompileFlags,
      Object includeDirs,
      Object quoteIncludeDirs,
      Object systemIncludeDirs,
      Object frameworkIncludeDirs,
      Object defines,
      boolean usePic,
      boolean addLegacyCxxOptions)
      throws EvalException;

  @SkylarkCallable(
      name = "create_link_variables",
      doc = "Returns link variables used for linking actions.",
      parameters = {
        @Param(
            name = "cc_toolchain",
            doc = "cc_toolchain for which we are creating build variables.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class),
        @Param(
            name = "feature_configuration",
            doc = "Feature configuration to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "library_search_directories",
            doc = "Depset of directories where linker will look for libraries at link time.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "runtime_library_search_directories",
            doc = "Depset of directories where loader will look for libraries at runtime.",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkNestedSet.class)
            }),
        @Param(
            name = "user_link_flags",
            doc = "List of additional link flags (linkopts).",
            positional = false,
            named = true,
            defaultValue = "None",
            noneable = true,
            allowedTypes = {
              @ParamType(type = NoneType.class),
              @ParamType(type = SkylarkList.class)
            }),
        @Param(
            name = "output_file",
            doc = "Optional output file path.",
            named = true,
            positional = false,
            defaultValue = "None",
            noneable = true),
        @Param(
            name = "param_file",
            doc = "Optional param file path.",
            named = true,
            positional = false,
            defaultValue = "None",
            noneable = true),
        @Param(
            name = "def_file",
            doc = "Optional .def file path.",
            named = true,
            positional = false,
            defaultValue = "None",
            noneable = true),
        // TODO(b/65151735): Remove once we migrate crosstools to features
        @Param(
            name = "is_using_linker",
            doc =
                "True when using linker, False when archiver. Caller is responsible for keeping "
                    + "this in sync with action name used (is_using_linker = True for linking "
                    + "executable or dynamic library, is_using_linker = False for archiving static "
                    + "library).",
            named = true,
            positional = false,
            defaultValue = "True"),
        // TODO(b/65151735): Remove once we migrate crosstools to features
        @Param(
            name = "is_linking_dynamic_library",
            doc =
                "True when creating dynamic library, False when executable or static library. "
                    + "Caller is responsible for keeping this in sync with action name used. "
                    + ""
                    + "This field will be removed once b/65151735 is fixed.",
            named = true,
            positional = false,
            defaultValue = "False"),
        @Param(
            name = "must_keep_debug",
            doc =
                "When set to True, bazel will expose 'strip_debug_symbols' variable, which is "
                    + "usually used to use the linker to strip debug symbols from the output file.",
            named = true,
            positional = false,
            defaultValue = "True"),
        @Param(
            name = "use_test_only_flags",
            doc = "When set to true, 'is_cc_test' variable will be set.",
            named = true,
            positional = false,
            defaultValue = "False"),
        // TODO(b/65151735): Remove once we migrate crosstools to features
        @Param(
            name = "is_static_linking_mode",
            doc = "Unused.",
            named = true,
            positional = false,
            defaultValue = "True"),
      })
  CcToolchainVariablesT getLinkBuildVariables(
      CcToolchainProviderT ccToolchainProvider,
      FeatureConfigurationT featureConfiguration,
      Object librarySearchDirectories,
      Object runtimeLibrarySearchDirectories,
      Object userLinkFlags,
      Object outputFile,
      Object paramFile,
      Object defFile,
      boolean isUsingLinkerNotArchiver,
      boolean isCreatingSharedLibrary,
      boolean mustKeepDebug,
      boolean useTestOnlyFlags,
      boolean isStaticLinkingMode)
      throws EvalException;

  @SkylarkCallable(name = "empty_variables", documented = false)
  CcToolchainVariablesT getVariables();

  @SkylarkCallable(
      name = "create_library_to_link",
      doc = "Creates <code>LibraryToLink</code>",
      useLocation = true,
      useEnvironment = true,
      parameters = {
        @Param(
            name = "actions",
            type = SkylarkActionFactoryApi.class,
            positional = false,
            named = true,
            doc = "<code>actions</code> object."),
        @Param(
            name = "feature_configuration",
            doc = "<code>feature_configuration</code> to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "cc_toolchain",
            doc = "<code>CcToolchainInfo</code> provider to be used.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class),
        @Param(
            name = "static_library",
            doc = "<code>File</code> of static library to be linked.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = FileApi.class),
        @Param(
            name = "pic_static_library",
            doc = "<code>File</code> of pic static library to be linked.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = FileApi.class),
        @Param(
            name = "dynamic_library",
            doc =
                "<code>File</code> of dynamic library to be linked. Always used for runtime "
                    + "and used for linking if <code>interface_library</code> is not passed.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = FileApi.class),
        @Param(
            name = "interface_library",
            doc = "<code>File</code> of interface library to be linked.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = FileApi.class),
        @Param(
            name = "alwayslink",
            doc = "Whether to link the static library/objects in the --whole_archive block.",
            positional = false,
            named = true,
            defaultValue = "False"),
      })
  LibraryToLinkT createLibraryLinkerInput(
      Object actions,
      Object featureConfiguration,
      Object ccToolchainProvider,
      Object staticLibrary,
      Object picStaticLibrary,
      Object dynamicLibrary,
      Object interfaceLibrary,
      boolean alwayslink,
      Location location,
      Environment environment)
      throws EvalException, InterruptedException;

  @SkylarkCallable(
      name = "create_linking_context",
      doc = "Creates a <code>LinkingContext</code>.",
      useLocation = true,
      useContext = true,
      parameters = {
        @Param(
            name = "libraries_to_link",
            doc = "List of <code>LibraryToLink</code>.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = SkylarkList.class),
        @Param(
            name = "user_link_flags",
            doc = "List of user link flags passed as strings.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            type = SkylarkList.class),
        @Param(
            name = "additional_inputs",
            doc = "For additional inputs to the linking action, e.g.: linking scripts.",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class),
      })
  LinkingContextT createCcLinkingInfo(
      Object librariesToLinkObject,
      Object userLinkFlagsObject,
      SkylarkList<FileT> nonCodeInputs,
      Location location,
      StarlarkContext context)
      throws EvalException, InterruptedException;

  @SkylarkCallable(
      name = "merge_cc_infos",
      doc = "Merges a list of <code>CcInfo</code>s into one.",
      parameters = {
        @Param(
            name = "cc_infos",
            doc = "List of <code>CcInfo</code>s to be merged.",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class)
      })
  CcInfoApi mergeCcInfos(SkylarkList<CcInfoApi> ccInfos) throws EvalException;

  @SkylarkCallable(
      name = "create_compilation_context",
      doc = "Creates a <code>CompilationContext</code>.",
      parameters = {
        @Param(
            name = "headers",
            doc = "Set of headers needed to compile this target",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class),
        @Param(
            name = "system_includes",
            doc =
                "Set of search paths for header files referenced by angle brackets, i.e. "
                    + "#include &lt;foo/bar/header.h&gt;. They can be either relative to the exec "
                    + "root or absolute. Usually passed with -isystem",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class),
        @Param(
            name = "includes",
            doc =
                "Set of search paths for header files referenced both by angle bracket and quotes."
                    + "Usually passed with -I",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class),
        @Param(
            name = "quote_includes",
            doc =
                "Set of search paths for header files referenced by quotes, i.e. "
                    + "#include \"foo/bar/header.h\". They can be either relative to the exec "
                    + "root or absolute. Usually passed with -iquote",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class),
        @Param(
            name = "framework_includes",
            doc = "Set of framework search paths for header files (Apple platform only)",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class),
        @Param(
            name = "defines",
            doc = "Set of defines needed to compile this target. Each define is a string",
            positional = false,
            named = true,
            defaultValue = "unbound",
            type = Object.class)
      })
  CompilationContextT createCcCompilationContext(
      Object headers,
      Object systemIncludes,
      Object includes,
      Object quoteIncludes,
      Object frameworkIncludes,
      Object defines)
      throws EvalException;

  // TODO(b/65151735): Remove when cc_flags is entirely set from features.
  // This should only be called from the cc_flags_supplier rule.
  @SkylarkCallable(
      name = "legacy_cc_flags_make_variable_do_not_use",
      documented = false,
      parameters = {
        @Param(
            name = "cc_toolchain",
            doc = "C++ toolchain provider to be used.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class)
      })
  String legacyCcFlagsMakeVariable(CcToolchainProviderT ccToolchain);

  @SkylarkCallable(
      name = "is_cc_toolchain_resolution_enabled_do_not_use",
      documented = false,
      parameters = {
        @Param(
            name = "ctx",
            positional = false,
            named = true,
            type = SkylarkRuleContextApi.class,
            doc = "The rule context."),
      },
      doc = "Returns true if the --incompatible_enable_cc_toolchain_resolution flag is enabled.")
  boolean isCcToolchainResolutionEnabled(SkylarkRuleContextT ruleContext);

  @SkylarkCallable(
      name = "create_cc_toolchain_config_info",
      doc = "Creates a <code>CcToolchainConfigInfo</code> provider",
      parameters = {
        @Param(
            name = "ctx",
            positional = false,
            named = true,
            type = SkylarkRuleContextApi.class,
            doc = "The rule context."),
        @Param(
            name = "features",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "A list of <a href=\"https://github.com/bazelbuild/bazel/blob/master/tools/cpp/"
                    + "cc_toolchain_config_lib.bzl#L336\">features</a>."),
        @Param(
            name = "action_configs",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "A list of <a href=\"https://github.com/bazelbuild/bazel/blob/master/tools/cpp/"
                    + "cc_toolchain_config_lib.bzl#L461\">action_configs</a>."),
        @Param(
            name = "artifact_name_patterns",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "A list of <a href=\"https://github.com/bazelbuild/bazel/blob/master/tools/cpp/"
                    + "cc_toolchain_config_lib.bzl#L516\">artifact_name_patterns</a>."),
        @Param(
            name = "cxx_builtin_include_directories",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "<p>Built-in include directories for C++ compilation. These should be the exact "
                    + "paths used by the compiler, and are generally relative to the exec root.</p>"
                    + "<p>The paths used by the compiler can be determined by 'gcc -E -xc++ - -v'."
                    + "</p><p>We currently use the C++ paths also for C compilation, which is safe "
                    + "as long as there are no name clashes between C++ and C header files.</p>"
                    + "<p>Relative paths are resolved relative to the configuration file directory."
                    + "</p><p>If the compiler has --sysroot support, then these paths should use "
                    + "%sysroot% rather than the include path, and specify the sysroot attribute "
                    + "in order to give blaze the information necessary to make the correct "
                    + "replacements.</p>"),
        @Param(
            name = "toolchain_identifier",
            positional = false,
            type = String.class,
            named = true,
            doc =
                "<p>The unique identifier of the toolchain within the crosstool release. It must "
                    + "be possible to use this as a directory name in a path.</p>"
                    + "<p>It has to match the following regex: [a-zA-Z_][\\.\\- \\w]*</p>"),
        @Param(
            name = "host_system_name",
            positional = false,
            type = String.class,
            named = true,
            doc = "The system name which is required by the toolchain to run."),
        @Param(
            name = "target_system_name",
            positional = false,
            type = String.class,
            named = true,
            doc = "The GNU System Name."),
        @Param(
            name = "target_cpu",
            positional = false,
            type = String.class,
            named = true,
            doc = "The target architecture string."),
        @Param(
            name = "target_libc",
            positional = false,
            type = String.class,
            named = true,
            doc = "The libc version string (e.g. \"glibc-2.2.2\")."),
        @Param(
            name = "compiler",
            positional = false,
            type = String.class,
            named = true,
            doc = "The compiler version string (e.g. \"gcc-4.1.1\")."),
        @Param(
            name = "abi_version",
            positional = false,
            type = String.class,
            named = true,
            doc = "The abi in use, which is a gcc version. E.g.: \"gcc-3.4\""),
        @Param(
            name = "abi_libc_version",
            positional = false,
            type = String.class,
            named = true,
            doc = "The glibc version used by the abi we're using."),
        @Param(
            name = "tool_paths",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "A list of <a href=\"https://github.com/bazelbuild/bazel/blob/master/tools/cpp/"
                    + "cc_toolchain_config_lib.bzl#L400\">tool_paths</a>."),
        @Param(
            name = "make_variables",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class,
            doc =
                "A list of <a href=\"https://github.com/bazelbuild/bazel/blob/master/tools/cpp/"
                    + "cc_toolchain_config_lib.bzl#L86\">make_variables</a>."),
        @Param(
            name = "builtin_sysroot",
            positional = false,
            noneable = true,
            defaultValue = "None",
            allowedTypes = {@ParamType(type = String.class), @ParamType(type = NoneType.class)},
            named = true,
            doc =
                "The built-in sysroot. If this attribute is not present, Bazel does not "
                    + "allow using a different sysroot, i.e. through the --grte_top option."),
        @Param(
            name = "cc_target_os",
            positional = false,
            noneable = true,
            defaultValue = "None",
            allowedTypes = {@ParamType(type = String.class), @ParamType(type = NoneType.class)},
            named = true,
            doc = "Internal purpose only, do not use."),
      })
  CcToolchainConfigInfoT ccToolchainConfigInfoFromSkylark(
      SkylarkRuleContextT skylarkRuleContext,
      SkylarkList<Object> features,
      SkylarkList<Object> actionConfigs,
      SkylarkList<Object> artifactNamePatterns,
      SkylarkList<String> cxxBuiltInIncludeDirectories,
      String toolchainIdentifier,
      String hostSystemName,
      String targetSystemName,
      String targetCpu,
      String targetLibc,
      String compiler,
      String abiVersion,
      String abiLibcVersion,
      SkylarkList<Object> toolPaths,
      SkylarkList<Object> makeVariables,
      Object builtinSysroot,
      Object ccTargetOs)
      throws EvalException;

  @SkylarkCallable(
      name = "create_linking_context_from_compilation_outputs",
      doc =
          "Should be used for creating library rules that can propagate information downstream in"
              + " order to be linked later by a top level rule that does transitive linking to"
              + " create an executable or dynamic library.",
      useLocation = true,
      useContext = true,
      parameters = {
        @Param(
            name = "actions",
            type = SkylarkActionFactoryApi.class,
            positional = false,
            named = true,
            doc = "<code>actions</code> object."),
        @Param(
            name = "feature_configuration",
            doc = "<code>feature_configuration</code> to be queried.",
            positional = false,
            named = true,
            type = FeatureConfigurationApi.class),
        @Param(
            name = "cc_toolchain",
            doc = "<code>CcToolchainInfo</code> provider to be used.",
            positional = false,
            named = true,
            type = CcToolchainProviderApi.class),
        @Param(
            name = "compilation_outputs",
            doc = "Compilation outputs containing object files to link.",
            positional = false,
            named = true,
            type = CcCompilationOutputsApi.class),
        @Param(
            name = "user_link_flags",
            doc = "Additional list of linking options.",
            positional = false,
            named = true,
            defaultValue = "[]",
            noneable = true,
            type = SkylarkList.class),
        @Param(
            name = "linking_contexts",
            doc =
                "Libraries from dependencies. These libraries will be linked into the output "
                    + "artifact of the link() call, be it a binary or a library.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "[]",
            type = SkylarkList.class),
        @Param(
            name = "name",
            doc =
                "This is used for naming the output artifacts of actions created by this "
                    + "method.",
            positional = false,
            named = true,
            type = String.class),
        @Param(
            name = "language",
            doc = "Only C++ supported for now. Do not use this parameter.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "'c++'",
            type = String.class),
        @Param(
            name = "alwayslink",
            doc = "Whether this library should always be linked.",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "False",
            type = Boolean.class),
        @Param(
            name = "additional_inputs",
            doc = "For additional inputs to the linking action, e.g.: linking scripts.",
            positional = false,
            named = true,
            defaultValue = "[]",
            type = SkylarkList.class),
        @Param(
            name = "disallow_static_libraries",
            doc = "Whether static libraries should be created.",
            positional = false,
            named = true,
            defaultValue = "False",
            type = Boolean.class),
        @Param(
            name = "disallow_dynamic_library",
            doc = "Whether a dynamic library should be created.",
            positional = false,
            named = true,
            defaultValue = "False",
            type = Boolean.class),
        @Param(
            name = "grep_includes",
            positional = false,
            named = true,
            noneable = true,
            defaultValue = "None",
            allowedTypes = {@ParamType(type = FileApi.class), @ParamType(type = NoneType.class)}),
      })
  Tuple<Object> createLinkingContextFromCompilationOutputs(
      SkylarkActionFactoryT skylarkActionFactoryApi,
      FeatureConfigurationT skylarkFeatureConfiguration,
      CcToolchainProviderT skylarkCcToolchainProvider,
      CompilationOutputsT compilationOutputs,
      SkylarkList<String> userLinkFlags,
      SkylarkList<LinkingContextT> linkingContexts,
      String name,
      String language,
      boolean alwayslink,
      SkylarkList<FileT> additionalInputs,
      boolean disallowStaticLibraries,
      boolean disallowDynamicLibraries,
      Object grepIncludes,
      Location location,
      StarlarkContext bazelStarlarkContext)
      throws InterruptedException, EvalException;
}