- Add a size field to the header.

vm/object.cc

 // Copyright (c) 2011, 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/object.h"
 
 #include "vm/assembler.h"
 #include "vm/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 685 matching lines @@
   object_store->set_false_value(bool_value);
 }
 
 
 void Object::Print() const {
   OS::Print("%s\n", ToCString());
 }
 
 
 void Object::InitializeObject(uword address, intptr_t size) {
+  // TODO(iposva): Get a proper halt instruction from the assembler which
+  // would be needed here for code objects.
   uword initial_value = reinterpret_cast<uword>(null_);
   uword cur = address;
   uword end = address + size;
   while (cur < end) {
     *reinterpret_cast<uword*>(cur) = initial_value;
     cur += kWordSize;
   }
 }
 
 
 RawObject* Object::Allocate(const Class& cls,
                             intptr_t size,
                             Heap::Space space) {
+  ASSERT(Utils::IsAligned(size, kObjectAlignment));
   Isolate* isolate = Isolate::Current();
   Heap* heap = isolate->heap();
 
-  // TODO(iposva): Get a proper halt instruction from the assembler.
   uword address = heap->Allocate(size, space);
   NoGCScope no_gc;
   InitializeObject(address, size);
   RawObject* raw_obj = reinterpret_cast<RawObject*>(address + kHeapObjectTag);
   raw_obj->ptr()->class_ = cls.raw();
-  raw_obj->ptr()->tags_ = 0;
+  uword tags = 0;
+  tags = RawObject::SizeTag::update(size, tags);
+  raw_obj->ptr()->tags_ = tags;
   return raw_obj;
 }
 
 
 RawString* Class::Name() const {
   if (raw_ptr()->name_ != String::null()) {
     return raw_ptr()->name_;
   }
   ASSERT(class_class() != null_);  // Or GetSingletonClassIndex will not work.
   intptr_t index = GetSingletonClassIndex(raw());
@@ skipping 6752 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart