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
51 public:
52 // Constructor
53 ReservedSpace();
54 // Initialize the reserved space with the given size. If preferred_page_size
55 // is set, use this as minimum page size/alignment. This may waste some space
56 // if the given size is not aligned to that value, as the reservation will be
57 // aligned up to the final alignment in this case.
58 ReservedSpace(size_t size, size_t preferred_page_size = 0);
59 ReservedSpace(size_t size, size_t alignment, bool large,
98 }
99
100 ReservedSpace ReservedSpace::last_part(size_t partition_size)
101 {
102 return last_part(partition_size, alignment());
103 }
104
105 // Class encapsulating behavior specific of memory space reserved for Java heap.
106 class ReservedHeapSpace : public ReservedSpace {
107 private:
108 void try_reserve_heap(size_t size, size_t alignment, bool large,
109 char *requested_address);
110 void try_reserve_range(char *highest_start, char *lowest_start,
111 size_t attach_point_alignment, char *aligned_HBMA,
112 char *upper_bound, size_t size, size_t alignment, bool large);
113 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
114 // Create protection page at the beginning of the space.
115 void establish_noaccess_prefix();
116 public:
117 // Constructor. Tries to find a heap that is good for compressed oops.
118 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large);
119 // Returns the base to be used for compression, i.e. so that null can be
120 // encoded safely and implicit null checks can work.
121 char *compressed_oop_base() { return _base - _noaccess_prefix; }
122 };
123
124 // Class encapsulating behavior specific memory space for Code
125 class ReservedCodeSpace : public ReservedSpace {
126 public:
127 // Constructor
128 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
129 };
130
131 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
132
133 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
134 friend class VMStructs;
135 private:
136 // Reserved area
137 char* _low_boundary;
138 char* _high_boundary;
|
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 int _fd_for_heap;
41 private:
42 bool _executable;
43
44 // ReservedSpace
45 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
46 bool executable);
47 protected:
48 void initialize(size_t size, size_t alignment, bool large,
49 char* requested_address,
50 bool executable);
51
52 public:
53 // Constructor
54 ReservedSpace();
55 // Initialize the reserved space with the given size. If preferred_page_size
56 // is set, use this as minimum page size/alignment. This may waste some space
57 // if the given size is not aligned to that value, as the reservation will be
58 // aligned up to the final alignment in this case.
59 ReservedSpace(size_t size, size_t preferred_page_size = 0);
60 ReservedSpace(size_t size, size_t alignment, bool large,
99 }
100
101 ReservedSpace ReservedSpace::last_part(size_t partition_size)
102 {
103 return last_part(partition_size, alignment());
104 }
105
106 // Class encapsulating behavior specific of memory space reserved for Java heap.
107 class ReservedHeapSpace : public ReservedSpace {
108 private:
109 void try_reserve_heap(size_t size, size_t alignment, bool large,
110 char *requested_address);
111 void try_reserve_range(char *highest_start, char *lowest_start,
112 size_t attach_point_alignment, char *aligned_HBMA,
113 char *upper_bound, size_t size, size_t alignment, bool large);
114 void initialize_compressed_heap(const size_t size, size_t alignment, bool large);
115 // Create protection page at the beginning of the space.
116 void establish_noaccess_prefix();
117 public:
118 // Constructor. Tries to find a heap that is good for compressed oops.
119 // heap_allocation_directory is the path to the backing memory for Java heap. When set, Java heap will be allocated
120 // on the device which is managed by the file system where the directory resides.
121 ReservedHeapSpace(size_t size, size_t forced_base_alignment, bool large, const char* heap_allocation_directory = NULL);
122 // Returns the base to be used for compression, i.e. so that null can be
123 // encoded safely and implicit null checks can work.
124 char *compressed_oop_base() { return _base - _noaccess_prefix; }
125 };
126
127 // Class encapsulating behavior specific memory space for Code
128 class ReservedCodeSpace : public ReservedSpace {
129 public:
130 // Constructor
131 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
132 };
133
134 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
135
136 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
137 friend class VMStructs;
138 private:
139 // Reserved area
140 char* _low_boundary;
141 char* _high_boundary;
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