Promote objects if semi-space copy fails while scavenging.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ skipping 1997 matching lines @@
 
       offset++;
       current_cell >>= 1;
 
       // TODO(hpayer): Refactor EvacuateObject and call this function instead.
       if (heap()->ShouldBePromoted(object->address(), size) &&
           TryPromoteObject(object, size)) {
         continue;
       }
 
-      // Promotion failed. Just migrate object to another semispace.

[Hannes Payer (out of office), 2014/06/24 14:20:40]

Removed the outdated comment.

Note, here the invariant still holds since we linearly sweep the new space (see
comment below).

       AllocationResult allocation = new_space->AllocateRaw(size);
       if (allocation.IsRetry()) {
         if (!new_space->AddFreshPage()) {
           // Shouldn't happen. We are sweeping linearly, and to-space
           // has the same number of pages as from-space, so there is
           // always room.
           UNREACHABLE();
         }
         allocation = new_space->AllocateRaw(size);
         ASSERT(!allocation.IsRetry());
@@ skipping 2453 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal