Zero-sized new-space for VM isolate.

runtime/vm/heap.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_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 145 matching lines @@
 
   // Protect access to the heap.
   void WriteProtect(bool read_only);
 
   // Accessors for inlined allocation in generated code.
   uword TopAddress();
   uword EndAddress();
   static intptr_t new_space_offset() { return OFFSET_OF(Heap, new_space_); }
 
   // Initialize the heap and register it with the isolate.
-  static void Init(Isolate* isolate);
+  static void Init(Isolate* isolate,
+                   intptr_t max_new_gen_words,
+                   intptr_t max_old_gen_words);
 
   // Verify that all pointers in the heap point to the heap.
   bool Verify() const;
 
   // Print heap sizes.
   void PrintSizes() const;
 
   // Return amount of memory used and capacity in a space, excluding external.
   intptr_t UsedInWords(Space space) const;
   intptr_t CapacityInWords(Space space) const;
   intptr_t ExternalInWords(Space space) const;
   // Return the amount of GCing in microseconds.
   int64_t GCTimeInMicros(Space space) const;
 
   intptr_t Collections(Space space) const;
-  // Returns the [lowest, highest) addresses in the heap.
-  void StartEndAddress(uword* start, uword* end) const;
 
   ObjectSet* CreateAllocatedObjectSet() const;
 
   static const char* GCReasonToString(GCReason gc_reason);
 
   // Associate a peer with an object.  A non-existent peer is equal to NULL.
   void SetPeer(RawObject* raw_obj, void* peer) {
     SetWeakEntry(raw_obj, kPeers, reinterpret_cast<intptr_t>(peer));
   }
   void* GetPeer(RawObject* raw_obj) const {
@@ skipping 81 matching lines @@
     Data after_;
     int64_t times_[kDataEntries];
     intptr_t data_[kDataEntries];
 
    private:
     DISALLOW_COPY_AND_ASSIGN(GCStats);
   };
 
   static const intptr_t kNewAllocatableSize = 256 * KB;
 
-  Heap();
+  Heap(intptr_t max_new_gen_words, intptr_t max_old_gen_words);
 
   uword AllocateNew(intptr_t size);
   uword AllocateOld(intptr_t size, HeapPage::PageType type);
 
   // GC stats collection.
   void RecordBeforeGC(Space space, GCReason reason);
   void RecordAfterGC();
   void PrintStats();
   void UpdateClassHeapStatsBeforeGC(Heap::Space space);
 
+  // If this heap is non-empty, updates start and end to the smallest range that
+  // contains both the original [start, end) and the [lowest, highest) addresses
+  // of this heap.
+  void GetMergedAddressRange(uword* start, uword* end) const;
+
   // The different spaces used for allocation.
   Scavenger* new_space_;
   PageSpace* old_space_;
 
   WeakTable* new_weak_tables_[kNumWeakSelectors];
   WeakTable* old_weak_tables_[kNumWeakSelectors];
 
   // GC stats collection.
   GCStats stats_;
 
@@ skipping 31 matching lines @@
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_