Enable non-incremental code compaction.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 224 matching lines @@
   intptr_t reserved = (number_of_pages * Page::kObjectAreaSize);
   intptr_t free = reserved - space->SizeOfObjects();
   PrintF("[%s]: %d pages, %d (%.1f%%) free\n",
          AllocationSpaceName(space->identity()),
          number_of_pages,
          static_cast<int>(free),
          static_cast<double>(free) * 100 / reserved);
 }
 
 
-bool MarkCompactCollector::StartCompaction() {
+bool MarkCompactCollector::StartCompaction(bool incremental) {
   if (!compacting_) {
     ASSERT(evacuation_candidates_.length() == 0);
 
     CollectEvacuationCandidates(heap()->old_pointer_space());
     CollectEvacuationCandidates(heap()->old_data_space());
 
-    if (FLAG_compact_code_space) {
+    if (!incremental) {

[Erik Corry, 2012/02/07 08:12:58]

Please reverse the sense and order of this if.

       CollectEvacuationCandidates(heap()->code_space());
     } else if (FLAG_trace_fragmentation) {
       TraceFragmentation(heap()->code_space());
     }
 
     if (FLAG_trace_fragmentation) {
       TraceFragmentation(heap()->map_space());
       TraceFragmentation(heap()->cell_space());
     }
 
@@ skipping 427 matching lines @@
   if (was_marked_incrementally_ && PreciseSweepingRequired()) {
     heap()->incremental_marking()->Abort();
     ClearMarkbits();
     AbortCompaction();
     was_marked_incrementally_ = false;
   }
 
   // Don't start compaction if we are in the middle of incremental
   // marking cycle. We did not collect any slots.
   if (!FLAG_never_compact && !was_marked_incrementally_) {
-    StartCompaction();
+    StartCompaction(false);
   }
 
   PagedSpaces spaces;
   for (PagedSpace* space = spaces.next();
        space != NULL;
        space = spaces.next()) {
     space->PrepareForMarkCompact();
   }
 
 #ifdef DEBUG
@@ skipping 3375 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal