MemorySanitizer support.

runtime/vm/scavenger.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/scavenger.h"
 
 #include <algorithm>
 #include <map>
 #include <utility>
 
@@ skipping 506 matching lines @@
 void Scavenger::IterateStoreBuffers(Isolate* isolate,
                                     ScavengerVisitor* visitor) {
   StoreBuffer* buffer = isolate->store_buffer();
   heap_->RecordData(kStoreBufferEntries, buffer->Count());
 
   // Iterating through the store buffers.
   // Grab the deduplication sets out of the store buffer.
   StoreBufferBlock* pending = isolate->store_buffer()->Blocks();
   while (pending != NULL) {
     StoreBufferBlock* next = pending->next();
+    // Generated code appends to store buffers; tell MemorySanitizer.
+    MSAN_UNPOISON(pending, sizeof(*pending));
     intptr_t count = pending->Count();
     for (intptr_t i = 0; i < count; i++) {
       RawObject* raw_object = pending->At(i);
       ASSERT(raw_object->IsRemembered());
       raw_object->ClearRememberedBit();
       visitor->VisitingOldObject(raw_object);
       raw_object->VisitPointers(visitor);
     }
     delete pending;
     pending = next;
@@ skipping 359 matching lines @@
 }
 
 
 void Scavenger::FreeExternal(intptr_t size) {
   ASSERT(size >= 0);
   external_size_ -= size;
   ASSERT(external_size_ >= 0);
 }
 
 }  // namespace dart