VM: Load allocation-top and -end via Thread.

runtime/vm/thread.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_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/globals.h"
 #include "vm/os_thread.h"
 #include "vm/store_buffer.h"
 
 namespace dart {
 
 class CHA;
 class HandleScope;
+class Heap;
 class Isolate;
 class Object;
 class RawBool;
 class RawObject;
 class StackResource;
 class Zone;
 
+
 // List of VM-global objects/addresses cached in each Thread object.
 #define CACHED_VM_OBJECTS_LIST(V)                                              \
   V(RawObject*, object_null_, Object::null(), NULL)                            \
   V(RawBool*, bool_true_, Object::bool_true().raw(), NULL)                     \
   V(RawBool*, bool_false_, Object::bool_false().raw(), NULL)                   \
 
 #define CACHED_ADDRESSES_LIST(V)                                               \
   V(uword, update_store_buffer_entry_point_,                                   \
     StubCode::UpdateStoreBufferEntryPoint(), 0)
 
@@ skipping 77 matching lines @@
   }
 
   StackResource* top_resource() const { return state_.top_resource; }
   void set_top_resource(StackResource* value) {
     state_.top_resource = value;
   }
   static intptr_t top_resource_offset() {
     return OFFSET_OF(Thread, state_) + OFFSET_OF(State, top_resource);
   }
 
+  static intptr_t heap_offset() {
+    return OFFSET_OF(Thread, heap_);
+  }
+
   int32_t no_handle_scope_depth() const {
 #if defined(DEBUG)
     return state_.no_handle_scope_depth;
 #else
     return 0;
 #endif
   }
 
   void IncrementNoHandleScopeDepth() {
 #if defined(DEBUG)
@@ skipping 65 matching lines @@
 CACHED_CONSTANTS_LIST(DEFINE_OFFSET_METHOD)
 #undef DEFINE_OFFSET_METHOD
 
   static bool CanLoadFromThread(const Object& object);
   static intptr_t OffsetFromThread(const Object& object);
 
  private:
   static ThreadLocalKey thread_key_;
 
   Isolate* isolate_;
+  Heap* heap_;
   State state_;
   StoreBufferBlock* store_buffer_block_;
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
   type_name member_name;
 CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
 #undef DECLARE_MEMBERS
 
   explicit Thread(bool init_vm_constants = true);
 
   void InitVMConstants();
@@ skipping 17 matching lines @@
 
   friend class ApiZone;
   friend class Isolate;
   friend class StackZone;
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_