Precompilation: drop Field objects unless they are an entry point or referenced from a constant poo…

runtime/vm/precompiler.h

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_PRECOMPILER_H_
 #define VM_PRECOMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/hash_map.h"
 #include "vm/object.h"
@@ skipping 69 matching lines @@
   }
 
   static inline bool IsKeyEqual(Pair pair, Key key) {
     return pair->raw() == key->raw();
   }
 };
 
 typedef DirectChainedHashMap<FunctionKeyValueTrait> FunctionSet;
 
 
+class FieldKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const Field* Key;
+  typedef const Field* Value;
+  typedef const Field* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) {
+    return key->token_pos();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->raw() == key->raw();
+  }
+};
+
+typedef DirectChainedHashMap<FieldKeyValueTrait> FieldSet;
+
+
 class Precompiler : public ValueObject {
  public:
   static RawError* CompileAll(
       Dart_QualifiedFunctionName embedder_entry_points[],
       bool reset_fields);
 
   // Returns named function that is a unique dynamic target, i.e.,
   // - the target is identified by its name alone, since it occurs only once.
   // - target's class has no subclasses, and neither is subclassed, i.e.,
   //   the receiver type can be only the function's class.
@@ skipping 18 matching lines @@
   void AddField(const Field& field);
   void AddFunction(const Function& function);
   void AddInstantiatedClass(const Class& cls);
   void AddSelector(const String& selector);
   bool IsSent(const String& selector);
 
   void ProcessFunction(const Function& function);
   void CheckForNewDynamicFunctions();
 
   void DropUncompiledFunctions();
+  void DropFields();
   void CollectDynamicFunctionNames();
   void BindStaticCalls();
   void DedupStackmaps();
   void ResetPrecompilerState();
 
   class FunctionVisitor : public ValueObject {
    public:
     virtual ~FunctionVisitor() {}
     virtual void VisitFunction(const Function& function) = 0;
   };
@@ skipping 10 matching lines @@
   Zone* zone_;
   Isolate* isolate_;
 
   const bool reset_fields_;
 
   bool changed_;
   intptr_t function_count_;
   intptr_t class_count_;
   intptr_t selector_count_;
   intptr_t dropped_function_count_;
+  intptr_t dropped_field_count_;
 
   const GrowableObjectArray& libraries_;
   const GrowableObjectArray& pending_functions_;
   SymbolSet sent_selectors_;
   FunctionSet enqueued_functions_;
+  FieldSet fields_to_retain_;
   Error& error_;
 };
 
 }  // namespace dart
 
 #endif  // VM_PRECOMPILER_H_