Refactoring of snapshots. This simplifies and improves

src/spaces.cc

 // Copyright 2011 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 863 matching lines @@
 intptr_t PagedSpace::SizeOfFirstPage() {
   int size = 0;
   switch (identity()) {
     case OLD_POINTER_SPACE:
       size = 64 * kPointerSize * KB;
       break;
     case OLD_DATA_SPACE:
       size = 192 * KB;
       break;
     case MAP_SPACE:
-      size = 128 * KB;
+      size = 16 * kPointerSize * KB;
       break;
     case CELL_SPACE:
       size = 96 * KB;
       break;
     case CODE_SPACE:
       if (kPointerSize == 8) {
         // On x64 we allocate code pages in a special way (from the reserved
         // 2Byte area). That part of the code is not yet upgraded to handle
         // small pages.
         size = AreaSize();
@@ skipping 1356 matching lines @@
   if (new_area == NULL) new_area = SlowAllocateRaw(size_in_bytes);
   if (new_area == NULL) return false;
 
   int old_linear_size = static_cast<int>(limit() - top());
   // Mark the old linear allocation area with a free space so it can be
   // skipped when scanning the heap.  This also puts it back in the free list
   // if it is big enough.
   Free(top(), old_linear_size);
 
   SetTop(new_area->address(), new_area->address() + size_in_bytes);
-  Allocate(size_in_bytes);
   return true;
 }
 
 
+static void RepairFreeList(Heap* heap, FreeListNode* n) {
+  while (n != NULL) {
+    Map** map_location = reinterpret_cast<Map**>(n->address());
+    if (*map_location == NULL) {
+      *map_location = heap->free_space_map();
+    } else {
+      ASSERT(*map_location == heap->free_space_map());
+    }
+    n = n->next();
+  }
+}
+
+
+void FreeList::RepairLists(Heap* heap) {
+  RepairFreeList(heap, small_list_);
+  RepairFreeList(heap, medium_list_);
+  RepairFreeList(heap, large_list_);
+  RepairFreeList(heap, huge_list_);
+}
+
+
+// After we have booted, we have created a map which represents free space
+// on the heap.  If there was already a free list then the elements on it
+// were created with the wrong FreeSpaceMap (normally NULL), so we need to
+// fix them.
+void PagedSpace::RepairFreeListsAfterBoot() {
+  free_list_.RepairLists(heap());
+}
+
+
 // You have to call this last, since the implementation from PagedSpace
 // doesn't know that memory was 'promised' to large object space.
 bool LargeObjectSpace::ReserveSpace(int bytes) {
   return heap()->OldGenerationCapacityAvailable() >= bytes &&
          (!heap()->incremental_marking()->IsStopped() ||
            heap()->OldGenerationSpaceAvailable() >= bytes);
 }
 
 
 bool PagedSpace::AdvanceSweeper(intptr_t bytes_to_sweep) {
@@ skipping 582 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal