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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef TOOLS_GN_INHERITED_LIBRARIES_H_
#define TOOLS_GN_INHERITED_LIBRARIES_H_
#include <map>
#include <utility>
#include <vector>
#include "base/basictypes.h"
class Target;
// Represents an ordered uniquified set of all shared/static libraries for
// a given target. These are pushed up the dependency tree.
//
// Maintaining the order is important so GN links all libraries in the same
// order specified in the build files.
//
// Since this list is uniquified, appending to the list will not actually
// append a new item if the target already exists. However, the existing one
// may have its is_public flag updated. "Public" always wins, so is_public will
// be true if any dependency with that name has been set to public.
class InheritedLibraries {
public:
InheritedLibraries();
~InheritedLibraries();
// Returns the list of dependencies in order, optionally with the flag
// indicating whether the dependency is public.
std::vector<const Target*> GetOrdered() const;
std::vector<std::pair<const Target*, bool>> GetOrderedAndPublicFlag() const;
// Adds a single dependency to the end of the list. See note on adding above.
void Append(const Target* target, bool is_public);
// Appends all items from the "other" list to the current one. The is_public
// parameter indicates how the current target depends on the items in
// "other". If is_public is true, the existing public flags of the appended
// items will be preserved (propogating the public-ness up the dependency
// chain). If is_public is false, all deps will be added as private since
// the current target isn't forwarding them.
void AppendInherited(const InheritedLibraries& other, bool is_public);
// Like AppendInherited but only appends the items in "other" that are of
// type SHARED_LIBRARY and only when they're marked public. This is used
// to push shared libraries up the dependency chain, following only public
// deps, to dependent targets that need to use them.
void AppendPublicSharedLibraries(const InheritedLibraries& other,
bool is_public);
private:
struct Node {
Node() : index(static_cast<size_t>(-1)), is_public(false) {}
Node(size_t i, bool p) : index(i), is_public(p) {}
size_t index;
bool is_public;
};
typedef std::map<const Target*, Node> LibraryMap;
LibraryMap map_;
DISALLOW_COPY_AND_ASSIGN(InheritedLibraries);
};
#endif // TOOLS_GN_INHERITED_LIBRARIES_H_
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