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_GC_SHARED_MEMALLOCATOR_HPP
26 #define SHARE_GC_SHARED_MEMALLOCATOR_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "runtime/javaThread.hpp"
31 #include "utilities/exceptions.hpp"
32 #include "utilities/globalDefinitions.hpp"
33 #include "utilities/macros.hpp"
34
35 // These fascilities are used for allocating, and initializing newly allocated objects.
36
37 class MemAllocator: StackObj {
38 protected:
39 class Allocation;
40
41 Thread* const _thread;
42 Klass* const _klass;
43 const size_t _word_size;
44
45 // Allocate from the current thread's TLAB, without taking a new TLAB (no safepoint).
46 HeapWord* mem_allocate_inside_tlab_fast() const;
47
48 private:
49 // Allocate in a TLAB. Could allocate a new TLAB, and therefore potentially safepoint.
50 HeapWord* mem_allocate_inside_tlab_slow(Allocation& allocation) const;
51
52 // Allocate outside a TLAB. Could safepoint.
53 HeapWord* mem_allocate_outside_tlab(Allocation& allocation) const;
54
55 protected:
72 // that must be parseable as an oop by concurrent collectors.
73 oop finish(HeapWord* mem) const;
74
75 // Raw memory allocation. This will try to do a TLAB allocation, and otherwise fall
76 // back to calling CollectedHeap::mem_allocate().
77 HeapWord* mem_allocate(Allocation& allocation) const;
78
79 public:
80 // Allocate and fully construct the object, and perform various instrumentation. Could safepoint.
81 oop allocate() const;
82 };
83
84 class ObjAllocator: public MemAllocator {
85 public:
86 ObjAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
87 : MemAllocator(klass, word_size, thread) {}
88
89 virtual oop initialize(HeapWord* mem) const;
90 };
91
92 class ObjArrayAllocator: public MemAllocator {
93 protected:
94 const int _length;
95 const bool _do_zero;
96
97 void mem_zap_start_padding(HeapWord* mem) const PRODUCT_RETURN;
98 void mem_zap_end_padding(HeapWord* mem) const PRODUCT_RETURN;
99
100 public:
101 ObjArrayAllocator(Klass* klass, size_t word_size, int length, bool do_zero,
102 Thread* thread = Thread::current())
103 : MemAllocator(klass, word_size, thread),
104 _length(length),
105 _do_zero(do_zero) {}
106
107 virtual oop initialize(HeapWord* mem) const;
108 };
109
110 class ClassAllocator: public MemAllocator {
111 public:
|
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_GC_SHARED_MEMALLOCATOR_HPP
26 #define SHARE_GC_SHARED_MEMALLOCATOR_HPP
27
28 #include "memory/memRegion.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "runtime/javaThread.hpp"
31 #include "utilities/exceptions.hpp"
32 #include "utilities/globalDefinitions.hpp"
33 #include "utilities/macros.hpp"
34
35 // These facilities are used for allocating, and initializing newly allocated objects.
36
37 class MemAllocator: StackObj {
38 protected:
39 class Allocation;
40
41 Thread* const _thread;
42 Klass* const _klass;
43 const size_t _word_size;
44
45 // Allocate from the current thread's TLAB, without taking a new TLAB (no safepoint).
46 HeapWord* mem_allocate_inside_tlab_fast() const;
47
48 private:
49 // Allocate in a TLAB. Could allocate a new TLAB, and therefore potentially safepoint.
50 HeapWord* mem_allocate_inside_tlab_slow(Allocation& allocation) const;
51
52 // Allocate outside a TLAB. Could safepoint.
53 HeapWord* mem_allocate_outside_tlab(Allocation& allocation) const;
54
55 protected:
72 // that must be parseable as an oop by concurrent collectors.
73 oop finish(HeapWord* mem) const;
74
75 // Raw memory allocation. This will try to do a TLAB allocation, and otherwise fall
76 // back to calling CollectedHeap::mem_allocate().
77 HeapWord* mem_allocate(Allocation& allocation) const;
78
79 public:
80 // Allocate and fully construct the object, and perform various instrumentation. Could safepoint.
81 oop allocate() const;
82 };
83
84 class ObjAllocator: public MemAllocator {
85 public:
86 ObjAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
87 : MemAllocator(klass, word_size, thread) {}
88
89 virtual oop initialize(HeapWord* mem) const;
90 };
91
92 class ObjBufferAllocator: public MemAllocator {
93 public:
94 ObjBufferAllocator(Klass* klass, size_t word_size, Thread* thread = Thread::current())
95 : MemAllocator(klass, word_size, thread) {}
96 virtual oop initialize(HeapWord* mem) const;
97 };
98
99
100 class ObjArrayAllocator: public MemAllocator {
101 protected:
102 const int _length;
103 const bool _do_zero;
104
105 void mem_zap_start_padding(HeapWord* mem) const PRODUCT_RETURN;
106 void mem_zap_end_padding(HeapWord* mem) const PRODUCT_RETURN;
107
108 public:
109 ObjArrayAllocator(Klass* klass, size_t word_size, int length, bool do_zero,
110 Thread* thread = Thread::current())
111 : MemAllocator(klass, word_size, thread),
112 _length(length),
113 _do_zero(do_zero) {}
114
115 virtual oop initialize(HeapWord* mem) const;
116 };
117
118 class ClassAllocator: public MemAllocator {
119 public:
|