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// Copyright 2014 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.rules.cpp;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.vfs.PathFragment;
import java.util.Collection;
import java.util.List;
import javax.annotation.Nullable;
/**
* To be implemented by actions (such as C++ compilation steps) whose inputs can be scanned to
* discover other implicit inputs (such as C++ header files).
*
* <p>This is useful for remote execution strategies to be able to compute the complete set of files
* that must be distributed in order to execute such an action.
*/
public interface IncludeScannable {
/**
* Returns the built-in list of system include paths for the toolchain compiler. All paths in this
* list should be relative to the exec directory. They may be absolute if they are also installed
* on the remote build nodes or for local compilation.
*/
List<PathFragment> getBuiltInIncludeDirectories();
/**
* Returns an immutable list of "-iquote" include paths that should be used by
* the IncludeScanner for this action. GCC searches these paths first, but
* only for {@code #include "foo"}, not for {@code #include <foo>}.
*/
List<PathFragment> getQuoteIncludeDirs();
/**
* Returns an immutable list of "-I" include paths that should be used by the
* IncludeScanner for this action. GCC searches these paths ahead of the
* system include paths, but after "-iquote" include paths.
*/
List<PathFragment> getIncludeDirs();
/**
* Returns an immutable list of "-isystem" include paths that should be used
* by the IncludeScanner for this action. GCC searches these paths ahead of
* the built-in system include paths, but after all other paths. "-isystem"
* paths are treated the same as normal system directories.
*/
List<PathFragment> getSystemIncludeDirs();
/**
* Returns an immutable list of "-include" inclusions specified explicitly on
* the command line of this action. GCC will imagine that these files have
* been quote-included at the beginning of each source file.
*/
List<String> getCmdlineIncludes();
/**
* Returns an artifact that the compiler may unconditionally include, even if the source file
* does not mention it.
*/
@Nullable
List<Artifact> getBuiltInIncludeFiles();
/**
* Returns the artifact relative to which the {@code getCmdlineIncludes()} should be interpreted.
*/
Artifact getMainIncludeScannerSource();
/**
* Returns an immutable list of sources that the IncludeScanner should scan
* for this action.
*
* <p>Must contain {@code getMainIncludeScannerSource()}.
*/
Collection<Artifact> getIncludeScannerSources();
/**
* Returns explicit header files (i.e., header files explicitly listed) of transitive deps.
*/
NestedSet<Artifact> getDeclaredIncludeSrcs();
/**
* Returns an artifact that is the executable for grepping #include lines from a file.
*/
Artifact getGrepIncludes();
ImmutableList<Artifact> getDiscoveredModules();
}
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