11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
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 #ifndef SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP
26 #define SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP
27
28 #include "memory/allocation.hpp"
29
30 #define hrt_assert_is_valid(tag) \
31 assert(is_valid((tag)), err_msg("invalid HR type: %u", (uint) (tag)))
32
33 class HeapRegionType VALUE_OBJ_CLASS_SPEC {
34 private:
35 // We encode the value of the heap region type so the generation can be
36 // determined quickly. The tag is split into two parts:
37 //
38 // major type (young, old, humongous, archive) : top N-1 bits
39 // minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
40 //
41 // If there's need to increase the number of minor types in the
42 // future, we'll have to increase the size of the latter and hence
43 // decrease the size of the former.
44 //
45 // 0000 0 [ 0] Free
46 //
47 // 0001 0 [ 2] Young Mask
48 // 0001 0 [ 2] Eden
49 // 0001 1 [ 3] Survivor
50 //
51 // 0010 0 [ 4] Humongous Mask
80
81 Tag get() const {
82 hrt_assert_is_valid(_tag);
83 return _tag;
84 }
85
86 // Sets the type to 'tag'.
87 void set(Tag tag) {
88 hrt_assert_is_valid(tag);
89 hrt_assert_is_valid(_tag);
90 _tag = tag;
91 }
92
93 // Sets the type to 'tag', expecting the type to be 'before'. This
94 // is available for when we want to add sanity checking to the type
95 // transition.
96 void set_from(Tag tag, Tag before) {
97 hrt_assert_is_valid(tag);
98 hrt_assert_is_valid(before);
99 hrt_assert_is_valid(_tag);
100 assert(_tag == before,
101 err_msg("HR tag: %u, expected: %u new tag; %u", _tag, before, tag));
102 _tag = tag;
103 }
104
105 public:
106 // Queries
107
108 bool is_free() const { return get() == FreeTag; }
109
110 bool is_young() const { return (get() & YoungMask) != 0; }
111 bool is_eden() const { return get() == EdenTag; }
112 bool is_survivor() const { return get() == SurvTag; }
113
114 bool is_humongous() const { return (get() & HumongousMask) != 0; }
115 bool is_starts_humongous() const { return get() == StartsHumongousTag; }
116 bool is_continues_humongous() const { return get() == ContinuesHumongousTag; }
117
118 bool is_archive() const { return get() == ArchiveTag; }
119
120 // is_old regions may or may not also be pinned
121 bool is_old() const { return (get() & OldMask) != 0; }
|
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
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 #ifndef SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP
26 #define SHARE_VM_GC_G1_HEAPREGIONTYPE_HPP
27
28 #include "memory/allocation.hpp"
29
30 #define hrt_assert_is_valid(tag) \
31 assert(is_valid((tag)), "invalid HR type: %u", (uint) (tag))
32
33 class HeapRegionType VALUE_OBJ_CLASS_SPEC {
34 private:
35 // We encode the value of the heap region type so the generation can be
36 // determined quickly. The tag is split into two parts:
37 //
38 // major type (young, old, humongous, archive) : top N-1 bits
39 // minor type (eden / survivor, starts / cont hum, etc.) : bottom 1 bit
40 //
41 // If there's need to increase the number of minor types in the
42 // future, we'll have to increase the size of the latter and hence
43 // decrease the size of the former.
44 //
45 // 0000 0 [ 0] Free
46 //
47 // 0001 0 [ 2] Young Mask
48 // 0001 0 [ 2] Eden
49 // 0001 1 [ 3] Survivor
50 //
51 // 0010 0 [ 4] Humongous Mask
80
81 Tag get() const {
82 hrt_assert_is_valid(_tag);
83 return _tag;
84 }
85
86 // Sets the type to 'tag'.
87 void set(Tag tag) {
88 hrt_assert_is_valid(tag);
89 hrt_assert_is_valid(_tag);
90 _tag = tag;
91 }
92
93 // Sets the type to 'tag', expecting the type to be 'before'. This
94 // is available for when we want to add sanity checking to the type
95 // transition.
96 void set_from(Tag tag, Tag before) {
97 hrt_assert_is_valid(tag);
98 hrt_assert_is_valid(before);
99 hrt_assert_is_valid(_tag);
100 assert(_tag == before, "HR tag: %u, expected: %u new tag; %u", _tag, before, tag);
101 _tag = tag;
102 }
103
104 public:
105 // Queries
106
107 bool is_free() const { return get() == FreeTag; }
108
109 bool is_young() const { return (get() & YoungMask) != 0; }
110 bool is_eden() const { return get() == EdenTag; }
111 bool is_survivor() const { return get() == SurvTag; }
112
113 bool is_humongous() const { return (get() & HumongousMask) != 0; }
114 bool is_starts_humongous() const { return get() == StartsHumongousTag; }
115 bool is_continues_humongous() const { return get() == ContinuesHumongousTag; }
116
117 bool is_archive() const { return get() == ArchiveTag; }
118
119 // is_old regions may or may not also be pinned
120 bool is_old() const { return (get() & OldMask) != 0; }
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