src/share/vm/memory/metachunk.cpp

*** 28,39 ****
  #include "utilities/copy.hpp"
  #include "utilities/debug.hpp"
  
  class VirtualSpaceNode;
  
- const size_t metadata_chunk_initialize = 0xf7f7f7f7;
- 
  size_t Metachunk::object_alignment() {
    // Must align pointers and sizes to 8,
    // so that 64 bit types get correctly aligned.
    const size_t alignment = 8;
  
--- 28,37 ----
*** 56,71 ****
      _container(container)
  {
    _top = initial_top();
  #ifdef ASSERT
    set_is_tagged_free(false);
!   size_t data_word_size = pointer_delta(end(),
!                                         _top,
!                                         sizeof(MetaWord));
!   Copy::fill_to_words((HeapWord*)_top,
!                       data_word_size,
!                       metadata_chunk_initialize);
  #endif
  }
  
  MetaWord* Metachunk::allocate(size_t word_size) {
    MetaWord* result = NULL;
--- 54,64 ----
      _container(container)
  {
    _top = initial_top();
  #ifdef ASSERT
    set_is_tagged_free(false);
!   mangle(uninitMetaWordVal);
  #endif
  }
  
  MetaWord* Metachunk::allocate(size_t word_size) {
    MetaWord* result = NULL;
*** 96,111 ****
                   used_word_size(), free_word_size());
    }
  }
  
  #ifndef PRODUCT
! void Metachunk::mangle() {
!   // Mangle the payload of the chunk and not the links that
    // maintain list of chunks.
!   HeapWord* start = (HeapWord*)(bottom() + overhead());
    size_t size = word_size() - overhead();
!   Copy::fill_to_words(start, size, metadata_chunk_initialize);
  }
  #endif // PRODUCT
  
  void Metachunk::verify() {
  #ifdef ASSERT
--- 89,104 ----
                   used_word_size(), free_word_size());
    }
  }
  
  #ifndef PRODUCT
! void Metachunk::mangle(juint word_value) {
!   // Overwrite the payload of the chunk and not the links that
    // maintain list of chunks.
!   HeapWord* start = (HeapWord*)initial_top();
    size_t size = word_size() - overhead();
!   Copy::fill_to_words(start, size, word_value);
  }
  #endif // PRODUCT
  
  void Metachunk::verify() {
  #ifdef ASSERT