Initial tree-shaking for precompilation: only selective compilation, no removal of unused Functions…

runtime/vm/precompiler.h

Index: runtime/vm/precompiler.h
diff --git a/runtime/vm/precompiler.h b/runtime/vm/precompiler.h
index 140a8661ed74d6d76b7faf9e481ee3b1e29c7703..158a8ba88803215eb9bcf4805595f048ebb51d98 100644
--- a/runtime/vm/precompiler.h
+++ b/runtime/vm/precompiler.h
@@ -10,11 +10,54 @@
 namespace dart {
 
 // Forward declarations.
+class Class;
+class Error;
+class Field;
+class Function;
+class GrowableObjectArray;
 class RawError;
+class String;
 
-class Precompiler : public AllStatic {
+class Precompiler : public ValueObject {
  public:
   static RawError* CompileAll();
+
+ private:
+  explicit Precompiler(Thread* thread);
+
+  void DoCompileAll();
+  void ClearAllCode();
+  void AddRoots();
+  void Iterate();
+  void CleanUp();
+
+  void AddCalleesOf(const Function& function);
+  void AddField(const Field& field);
+  void AddFunction(const Function& function);
+  void AddClass(const Class& cls);
+  void AddSelector(const String& selector);
+  bool IsSent(const String& selector);
+
+  void ProcessFunction(const Function& function);
+  void CheckForNewDynamicFunctions();
+
+  Thread* thread() const { return thread_; }
+  Zone* zone() const { return zone_; }
+  Isolate* isolate() const { return isolate_; }
+
+  Thread* thread_;
+  Zone* zone_;
+  Isolate* isolate_;
+
+  bool changed_;
+  intptr_t function_count_;
+  intptr_t class_count_;
+
+  const GrowableObjectArray& libraries_;
+  const GrowableObjectArray& pending_functions_;
+  const GrowableObjectArray& collected_closures_;
+  const GrowableObjectArray& sent_selectors_;
+  Error& error_;
 };
 
 }  // namespace dart