13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/metachunk.hpp"
28 #include "utilities/copy.hpp"
29 #include "utilities/debug.hpp"
30
31 class VirtualSpaceNode;
32
33 const size_t metadata_chunk_initialize = 0xf7f7f7f7;
34
35 size_t Metachunk::object_alignment() {
36 // Must align pointers and sizes to 8,
37 // so that 64 bit types get correctly aligned.
38 const size_t alignment = 8;
39
40 // Make sure that the Klass alignment also agree.
41 STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
42
43 return alignment;
44 }
45
46 size_t Metachunk::overhead() {
47 return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord;
48 }
49
50 // Metachunk methods
51
52 Metachunk::Metachunk(size_t word_size,
53 VirtualSpaceNode* container)
54 : Metabase<Metachunk>(word_size),
55 _top(NULL),
56 _container(container)
57 {
58 _top = initial_top();
59 #ifdef ASSERT
60 set_is_tagged_free(false);
61 size_t data_word_size = pointer_delta(end(),
62 _top,
63 sizeof(MetaWord));
64 Copy::fill_to_words((HeapWord*)_top,
65 data_word_size,
66 metadata_chunk_initialize);
67 #endif
68 }
69
70 MetaWord* Metachunk::allocate(size_t word_size) {
71 MetaWord* result = NULL;
72 // If available, bump the pointer to allocate.
73 if (free_word_size() >= word_size) {
74 result = _top;
75 _top = _top + word_size;
76 }
77 return result;
78 }
79
80 // _bottom points to the start of the chunk including the overhead.
81 size_t Metachunk::used_word_size() const {
82 return pointer_delta(_top, bottom(), sizeof(MetaWord));
83 }
84
85 size_t Metachunk::free_word_size() const {
86 return pointer_delta(end(), _top, sizeof(MetaWord));
87 }
88
89 void Metachunk::print_on(outputStream* st) const {
90 st->print_cr("Metachunk:"
91 " bottom " PTR_FORMAT " top " PTR_FORMAT
92 " end " PTR_FORMAT " size " SIZE_FORMAT,
93 p2i(bottom()), p2i(_top), p2i(end()), word_size());
94 if (Verbose) {
95 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
96 used_word_size(), free_word_size());
97 }
98 }
99
100 #ifndef PRODUCT
101 void Metachunk::mangle() {
102 // Mangle the payload of the chunk and not the links that
103 // maintain list of chunks.
104 HeapWord* start = (HeapWord*)(bottom() + overhead());
105 size_t size = word_size() - overhead();
106 Copy::fill_to_words(start, size, metadata_chunk_initialize);
107 }
108 #endif // PRODUCT
109
110 void Metachunk::verify() {
111 #ifdef ASSERT
112 // Cannot walk through the blocks unless the blocks have
113 // headers with sizes.
114 assert(bottom() <= _top &&
115 _top <= (MetaWord*)end(),
116 "Chunk has been smashed");
117 #endif
118 return;
119 }
120
121 /////////////// Unit tests ///////////////
122
123 #ifndef PRODUCT
124
125 class TestMetachunk {
126 public:
|
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/allocation.hpp"
27 #include "memory/metachunk.hpp"
28 #include "utilities/copy.hpp"
29 #include "utilities/debug.hpp"
30
31 class VirtualSpaceNode;
32
33 size_t Metachunk::object_alignment() {
34 // Must align pointers and sizes to 8,
35 // so that 64 bit types get correctly aligned.
36 const size_t alignment = 8;
37
38 // Make sure that the Klass alignment also agree.
39 STATIC_ASSERT(alignment == (size_t)KlassAlignmentInBytes);
40
41 return alignment;
42 }
43
44 size_t Metachunk::overhead() {
45 return align_size_up(sizeof(Metachunk), object_alignment()) / BytesPerWord;
46 }
47
48 // Metachunk methods
49
50 Metachunk::Metachunk(size_t word_size,
51 VirtualSpaceNode* container)
52 : Metabase<Metachunk>(word_size),
53 _top(NULL),
54 _container(container)
55 {
56 _top = initial_top();
57 #ifdef ASSERT
58 set_is_tagged_free(false);
59 mangle();
60 #endif
61 }
62
63 MetaWord* Metachunk::allocate(size_t word_size) {
64 MetaWord* result = NULL;
65 // If available, bump the pointer to allocate.
66 if (free_word_size() >= word_size) {
67 result = _top;
68 _top = _top + word_size;
69 }
70 return result;
71 }
72
73 // _bottom points to the start of the chunk including the overhead.
74 size_t Metachunk::used_word_size() const {
75 return pointer_delta(_top, bottom(), sizeof(MetaWord));
76 }
77
78 size_t Metachunk::free_word_size() const {
79 return pointer_delta(end(), _top, sizeof(MetaWord));
80 }
81
82 void Metachunk::print_on(outputStream* st) const {
83 st->print_cr("Metachunk:"
84 " bottom " PTR_FORMAT " top " PTR_FORMAT
85 " end " PTR_FORMAT " size " SIZE_FORMAT,
86 p2i(bottom()), p2i(_top), p2i(end()), word_size());
87 if (Verbose) {
88 st->print_cr(" used " SIZE_FORMAT " free " SIZE_FORMAT,
89 used_word_size(), free_word_size());
90 }
91 }
92
93 #ifndef PRODUCT
94 void Metachunk::mangle(juint wordValue) {
95 // Overwrite the payload of the chunk and not the links that
96 // maintain list of chunks.
97 HeapWord* start = (HeapWord*)initial_top();
98 size_t size = word_size() - overhead();
99 Copy::fill_to_words(start, size, wordValue);
100 }
101 #endif // PRODUCT
102
103 void Metachunk::verify() {
104 #ifdef ASSERT
105 // Cannot walk through the blocks unless the blocks have
106 // headers with sizes.
107 assert(bottom() <= _top &&
108 _top <= (MetaWord*)end(),
109 "Chunk has been smashed");
110 #endif
111 return;
112 }
113
114 /////////////// Unit tests ///////////////
115
116 #ifndef PRODUCT
117
118 class TestMetachunk {
119 public:
|