dart::ForwardingBlock Class Reference

Public Member Functions
void	Clear ()
uword	Lookup (uword old_addr) const
void	RecordLive (uword old_addr, intptr_t size)
bool	IsLive (uword old_addr) const
uword	new_address () const
void	set_new_address (uword value)

Detailed Description

Definition at line 32 of file compactor.cc.

Member Function Documentation

Clear()

void dart::ForwardingBlock::Clear ( )

inline

Definition at line 34 of file compactor.cc.

               {
    new_address_ = 0;
    live_bitvector_ = 0;
  }

IsLive()

bool dart::ForwardingBlock::IsLive ( uword  old_addr ) const

inline

Definition at line 68 of file compactor.cc.

                                    {
    uword block_offset = old_addr & ~kBlockMask;
    intptr_t first_unit_position = block_offset >> kObjectAlignmentLog2;
    ASSERT(first_unit_position < kBitsPerWord);
    return (live_bitvector_ & (static_cast<uword>(1) << first_unit_position)) !=
           0;
  }

Lookup()

uword dart::ForwardingBlock::Lookup ( uword  old_addr ) const

inline

Definition at line 39 of file compactor.cc.

                                     {
    uword block_offset = old_addr & ~kBlockMask;
    intptr_t first_unit_position = block_offset >> kObjectAlignmentLog2;
    ASSERT(first_unit_position < kBitsPerWord);
    uword preceding_live_bitmask =
        (static_cast<uword>(1) << first_unit_position) - 1;
    uword preceding_live_bitset = live_bitvector_ & preceding_live_bitmask;
    uword preceding_live_bytes = Utils::CountOneBitsWord(preceding_live_bitset)
                                 << kObjectAlignmentLog2;
    return new_address_ + preceding_live_bytes;
  }

new_address()

uword dart::ForwardingBlock::new_address ( ) const

inline

Definition at line 76 of file compactor.cc.

{ return new_address_; }

RecordLive()

void dart::ForwardingBlock::RecordLive ( uword  old_addr, intptr_t  size  )

inline

Definition at line 56 of file compactor.cc.

                                                 {
    intptr_t size_in_units = size >> kObjectAlignmentLog2;
    if (size_in_units >= kBitsPerWord) {
      size_in_units = kBitsPerWord - 1;
    }
    uword block_offset = old_addr & ~kBlockMask;
    intptr_t first_unit_position = block_offset >> kObjectAlignmentLog2;
    ASSERT(first_unit_position < kBitsPerWord);
    live_bitvector_ |= ((static_cast<uword>(1) << size_in_units) - 1)
                       << first_unit_position;
  }

set_new_address()

void dart::ForwardingBlock::set_new_address ( uword  value )

inline

Definition at line 77 of file compactor.cc.

{ new_address_ = value; }

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The documentation for this class was generated from the following file:

• third_party/dart-lang/sdk/runtime/vm/heap/compactor.cc