29 #include "metaprogramming/primitiveConversions.hpp"
30
31 //
32 // Forwarding entry layout
33 // -----------------------
34 //
35 // 6 4 4
36 // 3 6 5 1 0
37 // +--------------------+--------------------------------------------------+-+
38 // |11111111 11111111 11|111111 11111111 11111111 11111111 11111111 1111111|1|
39 // +--------------------+--------------------------------------------------+-+
40 // | | |
41 // | | 0-0 Populated Flag (1-bits) *
42 // | |
43 // | * 45-1 To Object Offset (45-bits)
44 // |
45 // * 63-46 From Object Index (18-bits)
46 //
47
48 class ZForwardingEntry {
49 friend struct PrimitiveConversions;
50
51 private:
52 typedef ZBitField<uint64_t, bool, 0, 1> field_populated;
53 typedef ZBitField<uint64_t, size_t, 1, 45> field_to_offset;
54 typedef ZBitField<uint64_t, size_t, 46, 18> field_from_index;
55
56 uint64_t _entry;
57
58 public:
59 ZForwardingEntry() :
60 _entry(0) {}
61
62 ZForwardingEntry(size_t from_index, size_t to_offset) :
63 _entry(field_populated::encode(true) |
64 field_to_offset::encode(to_offset) |
65 field_from_index::encode(from_index)) {}
66
67 bool populated() const {
68 return field_populated::decode(_entry);
69 }
|
29 #include "metaprogramming/primitiveConversions.hpp"
30
31 //
32 // Forwarding entry layout
33 // -----------------------
34 //
35 // 6 4 4
36 // 3 6 5 1 0
37 // +--------------------+--------------------------------------------------+-+
38 // |11111111 11111111 11|111111 11111111 11111111 11111111 11111111 1111111|1|
39 // +--------------------+--------------------------------------------------+-+
40 // | | |
41 // | | 0-0 Populated Flag (1-bits) *
42 // | |
43 // | * 45-1 To Object Offset (45-bits)
44 // |
45 // * 63-46 From Object Index (18-bits)
46 //
47
48 class ZForwardingEntry {
49 friend class PrimitiveConversions;
50
51 private:
52 typedef ZBitField<uint64_t, bool, 0, 1> field_populated;
53 typedef ZBitField<uint64_t, size_t, 1, 45> field_to_offset;
54 typedef ZBitField<uint64_t, size_t, 46, 18> field_from_index;
55
56 uint64_t _entry;
57
58 public:
59 ZForwardingEntry() :
60 _entry(0) {}
61
62 ZForwardingEntry(size_t from_index, size_t to_offset) :
63 _entry(field_populated::encode(true) |
64 field_to_offset::encode(to_offset) |
65 field_from_index::encode(from_index)) {}
66
67 bool populated() const {
68 return field_populated::decode(_entry);
69 }
|