Precompilation: drop unused types and type arguments and empty classes and libraries.

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 148 matching lines @@
   }
 
   static inline bool IsKeyEqual(Pair pair, Key key) {
     return pair->raw() == key->raw();
   }
 };
 
 typedef DirectChainedHashMap<FieldKeyValueTrait> FieldSet;
 
 
+class ClassKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const Class* Key;
+  typedef const Class* Value;
+  typedef const Class* 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().value();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->raw() == key->raw();
+  }
+};
+
+typedef DirectChainedHashMap<ClassKeyValueTrait> ClassSet;
+
+
+class AbstractTypeKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const AbstractType* Key;
+  typedef const AbstractType* Value;
+  typedef const AbstractType* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) {
+    return key->Hash();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->raw() == key->raw();
+  }
+};
+
+typedef DirectChainedHashMap<AbstractTypeKeyValueTrait> AbstractTypeSet;
+
+
+class TypeArgumentsKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const TypeArguments* Key;
+  typedef const TypeArguments* Value;
+  typedef const TypeArguments* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) {
+    return key->Hash();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->raw() == key->raw();
+  }
+};
+
+typedef DirectChainedHashMap<TypeArgumentsKeyValueTrait> TypeArgumentsSet;
+
+
 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 13 matching lines @@
 
 
   static RawFunction* CompileStaticInitializer(const Field& field);
 
   void DoCompileAll(Dart_QualifiedFunctionName embedder_entry_points[]);
   void ClearAllCode();
   void AddRoots(Dart_QualifiedFunctionName embedder_entry_points[]);
   void AddEntryPoints(Dart_QualifiedFunctionName entry_points[]);
   void Iterate();
 
+  void AddType(const AbstractType& type);
+  void AddTypesOf(const Class& cls);
+  void AddTypesOf(const Function& function);
+  void AddTypeArguments(const TypeArguments& args);
   void AddCalleesOf(const Function& function);
   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 DropFunctions();
   void DropFields();
+  void TraceTypesFromRetainedClasses();
+  void DropTypes();
+  void DropTypeArguments();
+  void DropClasses();
+  void DropLibraries();
+
   void BindStaticCalls();
   void DedupStackmaps();
   void DedupStackmapLists();
   void DedupInstructions();
   void ResetPrecompilerState();
 
   void CollectDynamicFunctionNames();
 
   class FunctionVisitor : public ValueObject {
    public:
@@ skipping 14 matching lines @@
   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_;
+  intptr_t dropped_class_count_;
+  intptr_t dropped_typearg_count_;
+  intptr_t dropped_type_count_;
+  intptr_t dropped_library_count_;
 
-  const GrowableObjectArray& libraries_;
+  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_;
   Error& error_;
 };
 
 }  // namespace dart
 
 #endif  // VM_PRECOMPILER_H_