Precompilation: canonicalize Instructions in PRODUCT mode.

runtime/vm/object.h

 // Copyright (c) 2012, 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_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3805 matching lines @@
   static intptr_t HeaderSize() {
     intptr_t alignment = OS::PreferredCodeAlignment();
     return Utils::RoundUp(sizeof(RawInstructions), alignment);
   }
 
   static RawInstructions* FromEntryPoint(uword entry_point) {
     return reinterpret_cast<RawInstructions*>(
         entry_point - HeaderSize() + kHeapObjectTag);
   }
 
+  bool Equals(const Instructions& other) const {
+    if (size() != other.size()) {
+      return false;
+    }
+    NoSafepointScope no_safepoint;
+    return memcmp(raw_ptr(), other.raw_ptr(), InstanceSize(size())) == 0;
+  }
+
  private:
   void set_size(intptr_t size) const {
     StoreNonPointer(&raw_ptr()->size_, size);
   }
 
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets
   // and links the two in a GC safe manner.
   static RawInstructions* New(intptr_t size);
@@ skipping 763 matching lines @@
   // New is a private method as RawInstruction and RawCode objects should
   // only be created using the Code::FinalizeCode method. This method creates
   // the RawInstruction and RawCode objects, sets up the pointer offsets
   // and links the two in a GC safe manner.
   static RawCode* New(intptr_t pointer_offsets_length);
 
   FINAL_HEAP_OBJECT_IMPLEMENTATION(Code, Object);
   friend class Class;
   friend class SnapshotWriter;
   friend class CodePatcher;  // for set_instructions
+  friend class Precompiler;  // for set_instructions
   // So that the RawFunction pointer visitor can determine whether code the
   // function points to is optimized.
   friend class RawFunction;
 };
 
 
 class Context : public Object {
  public:
   RawContext* parent() const { return raw_ptr()->parent_; }
   void set_parent(const Context& parent) const {
@@ skipping 3780 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_