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_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "memory/allocation.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 private:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 bool _executable;
41
42 // ReservedSpace
43 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
44 bool executable);
45 void initialize(size_t size, size_t alignment, bool large,
46 char* requested_address,
47 const size_t noaccess_prefix,
48 bool executable);
49
50 protected:
51 // Create protection page at the beginning of the space.
52 void protect_noaccess_prefix(const size_t size);
53
54 public:
55 // Constructor
56 ReservedSpace();
57 ReservedSpace(size_t size);
58 ReservedSpace(size_t size, size_t alignment, bool large,
59 char* requested_address = NULL,
60 const size_t noaccess_prefix = 0);
61 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
62
63 // Accessors
64 char* base() const { return _base; }
65 size_t size() const { return _size; }
66 size_t alignment() const { return _alignment; }
67 bool special() const { return _special; }
68 bool executable() const { return _executable; }
69 size_t noaccess_prefix() const { return _noaccess_prefix; }
70 bool is_reserved() const { return _base != NULL; }
71 void release();
72
73 // Splitting
74 ReservedSpace first_part(size_t partition_size, size_t alignment,
75 bool split = false, bool realloc = true);
76 ReservedSpace last_part (size_t partition_size, size_t alignment);
77
78 // These simply call the above using the default alignment.
79 inline ReservedSpace first_part(size_t partition_size,
80 bool split = false, bool realloc = true);
81 inline ReservedSpace last_part (size_t partition_size);
82
83 // Alignment
84 static size_t page_align_size_up(size_t size);
85 static size_t page_align_size_down(size_t size);
86 static size_t allocation_align_size_up(size_t size);
87 static size_t allocation_align_size_down(size_t size);
88 };
89
90 ReservedSpace
91 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
92 {
93 return first_part(partition_size, alignment(), split, realloc);
94 }
95
96 ReservedSpace ReservedSpace::last_part(size_t partition_size)
97 {
98 return last_part(partition_size, alignment());
99 }
100
101 // Class encapsulating behavior specific of memory space reserved for Java heap
102 class ReservedHeapSpace : public ReservedSpace {
103 public:
104 // Constructor
105 ReservedHeapSpace(size_t size, size_t forced_base_alignment,
106 bool large, char* requested_address);
107 };
108
109 // Class encapsulating behavior specific memory space for Code
110 class ReservedCodeSpace : public ReservedSpace {
111 public:
112 // Constructor
113 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
114 };
115
116 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
117
118 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
119 friend class VMStructs;
120 private:
121 // Reserved area
122 char* _low_boundary;
123 char* _high_boundary;
124
125 // Committed area
126 char* _low;
|
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_RUNTIME_VIRTUALSPACE_HPP
26 #define SHARE_VM_RUNTIME_VIRTUALSPACE_HPP
27
28 #include "memory/allocation.hpp"
29
30 // ReservedSpace is a data structure for reserving a contiguous address range.
31
32 class ReservedSpace VALUE_OBJ_CLASS_SPEC {
33 friend class VMStructs;
34 protected:
35 char* _base;
36 size_t _size;
37 size_t _noaccess_prefix;
38 size_t _alignment;
39 bool _special;
40 private:
41 bool _executable;
42
43 // ReservedSpace
44 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
45 bool executable);
46 protected:
47 void initialize(size_t size, size_t alignment, bool large,
48 char* requested_address,
49 bool executable);
50 // Create protection page at the beginning of the space.
51 void establish_noaccess_prefix();
52
53 public:
54 // Constructor
55 ReservedSpace();
56 ReservedSpace(size_t size);
57 ReservedSpace(size_t size, size_t alignment, bool large,
58 char* requested_address = NULL);
59 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
60
61 // Accessors
62 char* base() const { return _base; }
63 size_t size() const { return _size; }
64 size_t alignment() const { return _alignment; }
65 bool special() const { return _special; }
66 bool executable() const { return _executable; }
67 size_t noaccess_prefix() const { return _noaccess_prefix; }
68 bool is_reserved() const { return _base != NULL; }
69 void release();
70
71 // Splitting
72 ReservedSpace first_part(size_t partition_size, size_t alignment,
73 bool split = false, bool realloc = true);
74 ReservedSpace last_part (size_t partition_size, size_t alignment);
75
76 // These simply call the above using the default alignment.
77 inline ReservedSpace first_part(size_t partition_size,
78 bool split = false, bool realloc = true);
79 inline ReservedSpace last_part (size_t partition_size);
80
81 // Alignment
82 static size_t page_align_size_up(size_t size);
83 static size_t page_align_size_down(size_t size);
84 static size_t allocation_align_size_up(size_t size);
85 static size_t allocation_align_size_down(size_t size);
86 };
87
88 ReservedSpace
89 ReservedSpace::first_part(size_t partition_size, bool split, bool realloc)
90 {
91 return first_part(partition_size, alignment(), split, realloc);
92 }
93
94 ReservedSpace ReservedSpace::last_part(size_t partition_size)
95 {
96 return last_part(partition_size, alignment());
97 }
98
99 // Class encapsulating behavior specific of memory space reserved for Java heap.
100 class ReservedHeapSpace : public ReservedSpace {
101 private:
102 void try_reserve_heap(size_t size, size_t alignment, bool large, char* requested_address);
103 void try_reserve_range(char *const highest_start, char *lowest_start, size_t attach_point_alignment,
104 char *aligned_HBMA, char *upper_bound, size_t size, size_t alignment, bool large);
105 void initialize_compressed_heap(size_t size, size_t alignment, bool large);
106 public:
107 // Constructor. Tries to find a heap that is good for compressed oops.
108 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large);
109 // Returns the base to be used for compression, i.e. so that null can be encoded safely and
110 // implicit null checks can work.
111 char *compressed_oop_base() { return _base - _noaccess_prefix; }
112 };
113
114 // Class encapsulating behavior specific memory space for Code
115 class ReservedCodeSpace : public ReservedSpace {
116 public:
117 // Constructor
118 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
119 };
120
121 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
122
123 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
124 friend class VMStructs;
125 private:
126 // Reserved area
127 char* _low_boundary;
128 char* _high_boundary;
129
130 // Committed area
131 char* _low;
|