Add initial prototype for the GN meta-buildsystem.

tools/gn/target.h

Index: tools/gn/target.h
diff --git a/tools/gn/target.h b/tools/gn/target.h
new file mode 100644
index 0000000000000000000000000000000000000000..63d62ae27174f48865c5bb950aadc31f95cc8d1f
--- /dev/null
+++ b/tools/gn/target.h
@@ -0,0 +1,145 @@
+// Copyright (c) 2013 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_TARGET_H_
+#define TOOLS_GN_TARGET_H_
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/strings/string_piece.h"
+#include "base/synchronization/lock.h"
+#include "tools/gn/config_values.h"
+#include "tools/gn/item.h"
+#include "tools/gn/source_file.h"
+
+class InputFile;
+class Settings;
+class Token;
+
+class Target : public Item {
+ public:
+  enum OutputType {
+    NONE,
+    EXECUTABLE,
+    SHARED_LIBRARY,
+    STATIC_LIBRARY,
+    LOADABLE_MODULE,
+    COPY_FILES,
+    CUSTOM,
+  };
+  typedef std::vector<SourceFile> FileList;
+  typedef std::vector<std::string> StringVector;
+
+  Target(const Settings* settings, const Label& label);
+  virtual ~Target();
+
+  // Item overrides.
+  virtual Target* AsTarget() OVERRIDE;
+  virtual const Target* AsTarget() const OVERRIDE;
+  virtual void OnResolved() OVERRIDE;
+
+  // This flag indicates if we've run the TargetGenerator for this target to
+  // fill out the rest of the values. Once we've done this, we save the
+  // location of the function that started the generating so that we can detect
+  // duplicate declarations.
+  bool HasBeenGenerated() const;
+  void SetGenerated(const Token* token);
+
+  const Settings* settings() const { return settings_; }
+
+  OutputType output_type() const { return output_type_; }
+  void set_output_type(OutputType t) { output_type_ = t; }
+
+  bool IsLinkable() const;
+
+  const FileList& sources() const { return sources_; }
+  void swap_in_sources(FileList* s) { sources_.swap(*s); }
+
+  const FileList& data() const { return data_; }
+  void swap_in_data(FileList* d) { data_.swap(*d); }
+
+  const std::vector<const Target*>& deps() const { return deps_; }
+  void swap_in_deps(std::vector<const Target*>* d) { deps_.swap(*d); }
+
+  // List of configs that this class inherits settings from.
+  const std::vector<const Config*>& configs() const { return configs_; }
+  void swap_in_configs(std::vector<const Config*>* c) { configs_.swap(*c); }
+
+  // List of configs that all dependencies (direct and indirect) of this
+  // target get. These configs are not added to this target.
+  const std::vector<const Config*>& all_dependent_configs() const {
+    return all_dependent_configs_;
+  }
+  void swap_in_all_dependent_configs(std::vector<const Config*>* c) {
+    all_dependent_configs_.swap(*c);
+  }
+
+  // List of configs that targets depending directly on this one get. These
+  // configs are not added to this target.
+  const std::vector<const Config*>& direct_dependent_configs() const {
+    return direct_dependent_configs_;
+  }
+  void swap_in_direct_dependent_configs(std::vector<const Config*>* c) {
+    direct_dependent_configs_.swap(*c);
+  }
+
+  const std::set<const Target*>& inherited_libraries() const {
+    return inherited_libraries_;
+  }
+
+  // This config represents the configuration set directly on this target.
+  ConfigValues& config_values() { return config_values_; }
+  const ConfigValues& config_values() const { return config_values_; }
+
+  const SourceDir& destdir() const { return destdir_; }
+  void set_destdir(const SourceDir& d) { destdir_ = d; }
+
+  const SourceFile& script() const { return script_; }
+  void set_script(const SourceFile& s) { script_ = s; }
+
+  const std::vector<std::string>& script_args() const { return script_args_; }
+  void swap_in_script_args(std::vector<std::string>* sa) {
+    script_args_.swap(*sa);
+  }
+
+  const FileList& outputs() const { return outputs_; }
+  void swap_in_outputs(FileList* s) { outputs_.swap(*s); }
+
+ private:
+  const Settings* settings_;
+  OutputType output_type_;
+
+  FileList sources_;
+  FileList data_;
+  std::vector<const Target*> deps_;
+  std::vector<const Config*> configs_;
+  std::vector<const Config*> all_dependent_configs_;
+  std::vector<const Config*> direct_dependent_configs_;
+
+  // Libraries from transitive deps. Libraries need to be linked only
+  // with the end target (executable, shared library). These do not get
+  // pushed beyond shared library boundaries.
+  std::set<const Target*> inherited_libraries_;
+
+  ConfigValues config_values_;
+
+  SourceDir destdir_;
+
+  // Script target stuff.
+  SourceFile script_;
+  std::vector<std::string> script_args_;
+  FileList outputs_;
+
+  bool generated_;
+  const Token* generator_function_;  // Who generated this: for error messages.
+
+  DISALLOW_COPY_AND_ASSIGN(Target);
+};
+
+#endif  // TOOLS_GN_TARGET_H_