GYP generator for GN

tools/gn/setup.h

Index: tools/gn/setup.h
diff --git a/tools/gn/setup.h b/tools/gn/setup.h
index bd7166d49f40c5cbeb96ad77429fb1544a005149..c2b3d82e0ce7ee403264f0a56ac17435a0d94695 100644
--- a/tools/gn/setup.h
+++ b/tools/gn/setup.h
@@ -23,26 +23,51 @@ class ParseNode;
 
 extern const char kDotfile_Help[];
 
+// Base class for code shared between Setup and DependentSetup.
+class CommonSetup {
+ public:
+  virtual ~CommonSetup();
+
+  // When true (the default), Run() will check for unresolved dependencies and
+  // cycles upon completion. When false, such errors will be ignored.
+  void set_check_for_bad_items(bool s) { check_for_bad_items_ = s; }
+
+  BuildSettings& build_settings() { return build_settings_; }
+
+ protected:
+  CommonSetup();
+  CommonSetup(const CommonSetup& other);
+
+  // Performs the two sets of operations to run the generation before and after
+  // the message loop is run.
+  void RunPreMessageLoop();
+  bool RunPostMessageLoop();
+
+ protected:
+  BuildSettings build_settings_;
+
+  bool check_for_bad_items_;
+
+ private:
+  CommonSetup& operator=(const CommonSetup& other);  // Disallow.
+};
+
 // Helper class to setup the build settings and environment for the various
 // commands to run.
-class Setup {
+class Setup : public CommonSetup {
  public:
   Setup();
-  ~Setup();
+  virtual ~Setup();
 
   // Configures the build for the current command line. On success returns
   // true. On failure, prints the error and returns false.
   bool DoSetup();
 
-  // When true (the default), Run() will check for unresolved dependencies and
-  // cycles upon completion. When false, such errors will be ignored.
-  void set_check_for_bad_items(bool s) { check_for_bad_items_ = s; }
-
   // Runs the load, returning true on success. On failure, prints the error
-  // and returns false.
+  // and returns false. This includes both RunPreMessageLoop() and
+  // RunPostMessageLoop().
   bool Run();
 
-  BuildSettings& build_settings() { return build_settings_; }
   Scheduler& scheduler() { return scheduler_; }
 
  private:
@@ -61,11 +86,8 @@ class Setup {
 
   bool FillOtherConfig(const CommandLine& cmdline);
 
-  BuildSettings build_settings_;
   Scheduler scheduler_;
 
-  bool check_for_bad_items_;
-
   // These empty settings and toolchain are used to interpret the command line
   // and dot file.
   BuildSettings empty_build_settings_;
@@ -89,4 +111,27 @@ class Setup {
   DISALLOW_COPY_AND_ASSIGN(Setup);
 };
 
+// A dependent setup allows one to do more than one build at a time. You would
+// make a dependent setup which clones the state of the main one, make any
+// necessary changes, and then run it.
+//
+// The way to run both at the same time is:
+//   dependent_setup.RunPreMessageLoop();
+//   main_setup.Run();
+//   dependent_setup.RunPostMessageLoop();
+// so that the main setup executes the message loop, but both are run.
+class DependentSetup : public CommonSetup {
+ public:
+  DependentSetup(const Setup& main_setup);
+  virtual ~DependentSetup();
+
+  // These are the two parts of Run() in the regular setup, not including the
+  // call to actually run the message loop.
+  void RunPreMessageLoop();
+  bool RunPostMessageLoop();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DependentSetup);
+};
+
 #endif  // TOOLS_GN_SETUP_H_