Deletion barrier preparation: validate overwritten references.

runtime/vm/pages.cc

 // 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.
 
 #include "vm/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 862 matching lines @@
   if (result != 0) {
     usage_.used_in_words += size >> kWordSizeLog2;
     return result;
   }
   result = TryAllocateDataBumpLocked(size, growth_policy);
   if (result != 0) return result;
   return TryAllocateDataLocked(size, growth_policy);
 }
 
 
+uword PageSpace::TryAllocateSmiInitializedLocked(intptr_t size,
+                                                 GrowthPolicy growth_policy) {
+  uword result = TryAllocateDataBumpLocked(size, growth_policy);
+  if (collections() != 0) {
+    FATAL1("%" Pd " GCs before TryAllocateSmiInitializedLocked", collections());
+  }
+#if defined(DEBUG)
+  RawObject** begin = reinterpret_cast<RawObject**>(result);
+  RawObject** end = reinterpret_cast<RawObject**>(result + size);
+  for (RawObject** current = begin; current < end; ++current) {
+    ASSERT(!(*current)->IsHeapObject());
+  }
+#endif
+  return result;
+}
+
+
 PageSpaceController::PageSpaceController(Heap* heap,
                                          int heap_growth_ratio,
                                          int heap_growth_max,
                                          int garbage_collection_time_ratio)
     : heap_(heap),
       is_enabled_(false),
       grow_heap_(heap_growth_max / 2),
       heap_growth_ratio_(heap_growth_ratio),
       desired_utilization_((100.0 - heap_growth_ratio) / 100.0),
       heap_growth_max_(heap_growth_max),
@@ skipping 112 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>((static_cast<double>(gc_time) /
                                    static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart