Precompilation: canonicalize Instructions in PRODUCT mode.

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 78 matching lines @@
         return false;
       }
     }
     return true;
   }
 };
 
 typedef DirectChainedHashMap<ArrayKeyValueTrait> ArraySet;
 
 
+class InstructionsKeyValueTrait {
+ public:
+  // Typedefs needed for the DirectChainedHashMap template.
+  typedef const Instructions* Key;
+  typedef const Instructions* Value;
+  typedef const Instructions* Pair;
+
+  static Key KeyOf(Pair kv) { return kv; }
+
+  static Value ValueOf(Pair kv) { return kv; }
+
+  static inline intptr_t Hashcode(Key key) {
+    return key->size();
+  }
+
+  static inline bool IsKeyEqual(Pair pair, Key key) {
+    return pair->Equals(*key);
+  }
+};
+
+typedef DirectChainedHashMap<InstructionsKeyValueTrait> InstructionsSet;
+
+
 class FunctionKeyValueTrait {
  public:
   // Typedefs needed for the DirectChainedHashMap template.
   typedef const Function* Key;
   typedef const Function* Value;
   typedef const Function* Pair;
 
   static Key KeyOf(Pair kv) { return kv; }
 
   static Value ValueOf(Pair kv) { return kv; }
@@ skipping 68 matching lines @@
   bool IsSent(const String& selector);
 
   void ProcessFunction(const Function& function);
   void CheckForNewDynamicFunctions();
 
   void DropFunctions();
   void DropFields();
   void BindStaticCalls();
   void DedupStackmaps();
   void DedupStackmapLists();
+  void DedupInstructions();
   void ResetPrecompilerState();
 
   void CollectDynamicFunctionNames();
 
   class FunctionVisitor : public ValueObject {
    public:
     virtual ~FunctionVisitor() {}
     virtual void VisitFunction(const Function& function) = 0;
   };
 
@@ skipping 22 matching lines @@
   const GrowableObjectArray& pending_functions_;
   SymbolSet sent_selectors_;
   FunctionSet enqueued_functions_;
   FieldSet fields_to_retain_;
   Error& error_;
 };
 
 }  // namespace dart
 
 #endif  // VM_PRECOMPILER_H_