Tree-shake consts.

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/hash_table.h"
@@ skipping 218 matching lines @@
   }
 
   static inline bool IsKeyEqual(Pair pair, Key key) {
     return pair->raw() == key->raw();
   }
 };
 
 typedef DirectChainedHashMap<TypeArgumentsKeyValueTrait> TypeArgumentsSet;
 
 
+class InstanceKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const Instance* Key;
+  typedef const Instance* Value;
+  typedef const Instance* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) {
+    return key->GetClassId();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->raw() == key->raw();
+  }
+};
+
+typedef DirectChainedHashMap<InstanceKeyValueTrait> InstanceSet;
+
+
 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 28 matching lines @@
   void AddConstObject(const Instance& instance);
   void AddClosureCall(const ICData& call_site);
   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 TraceConstFunctions();
 
   void DropFunctions();
   void DropFields();
   void TraceTypesFromRetainedClasses();
   void DropTypes();
   void DropTypeArguments();
   void DropClasses();
   void DropLibraries();
 
   void BindStaticCalls();
@@ skipping 36 matching lines @@
   intptr_t dropped_library_count_;
 
   GrowableObjectArray& libraries_;
   const GrowableObjectArray& pending_functions_;
   SymbolSet sent_selectors_;
   FunctionSet enqueued_functions_;
   FieldSet fields_to_retain_;
   ClassSet classes_to_retain_;
   TypeArgumentsSet typeargs_to_retain_;
   AbstractTypeSet types_to_retain_;
+  InstanceSet consts_to_retain_;
   Error& error_;
 };
 
 
 class FunctionsTraits {
  public:
   static bool IsMatch(const Object& a, const Object& b) {
     Zone* zone = Thread::Current()->zone();
     String& a_s = String::Handle(zone);
     String& b_s = String::Handle(zone);
@@ skipping 14 matching lines @@
     return function.raw();
   }
 };
 
 typedef UnorderedHashSet<FunctionsTraits> UniqueFunctionsSet;
 
 
 }  // namespace dart
 
 #endif  // VM_PRECOMPILER_H_