- More use of pre-allocated read-only handles.

runtime/vm/assembler_x64.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/heap.h"
 #include "vm/memory_region.h"
@@ skipping 60 matching lines @@
       patchable_pool_entries_(),
       prologue_offset_(-1),
       comments_() {
   // Far branching mode is only needed and implemented for MIPS and ARM.
   ASSERT(!use_far_branches);
   if (Isolate::Current() != Dart::vm_isolate()) {
     object_pool_ = GrowableObjectArray::New(Heap::kOld);
 
     // These objects and labels need to be accessible through every pool-pointer
     // at the same index.
-    object_pool_.Add(Object::Handle(), Heap::kOld);
+    object_pool_.Add(Object::null_object(), Heap::kOld);
     patchable_pool_entries_.Add(kNotPatchable);
 
     object_pool_.Add(Bool::True(), Heap::kOld);
     patchable_pool_entries_.Add(kNotPatchable);
 
     object_pool_.Add(Bool::False(), Heap::kOld);
     patchable_pool_entries_.Add(kNotPatchable);
 
     if (StubCode::UpdateStoreBuffer_entry() != NULL) {
       FindExternalLabel(&StubCode::UpdateStoreBufferLabel(), kNotPatchable);
       patchable_pool_entries_.Add(kNotPatchable);
     } else {
-      object_pool_.Add(Object::Handle(), Heap::kOld);
+      object_pool_.Add(Object::null_object(), Heap::kOld);
       patchable_pool_entries_.Add(kNotPatchable);
     }
 
     if (StubCode::CallToRuntime_entry() != NULL) {
       FindExternalLabel(&StubCode::CallToRuntimeLabel(), kNotPatchable);
       patchable_pool_entries_.Add(kNotPatchable);
     } else {
-      object_pool_.Add(Object::Handle(), Heap::kOld);
+      object_pool_.Add(Object::null_object(), Heap::kOld);
       patchable_pool_entries_.Add(kNotPatchable);
     }
   }
 }
 
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) {
   memset(reinterpret_cast<void*>(data), Instr::kBreakPointInstruction, length);
 }
 
@@ skipping 2748 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfXmmRegisters));
   return xmm_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64