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comparison src/share/vm/runtime/virtualspace.hpp @ 656:6bdd6923ba16

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6541756: Reduce executable C-heap Summary: Add executable parameters to reserve_memory and commit_memory to reduce executable memory to only the Code Heap. Reviewed-by: xlu, kvn, acorn
author coleenp
date Wed, 25 Mar 2009 14:19:20 -0400
parents 660978a2a31a
children bd02caa94611
comparison
equal deleted inserted replaced
655:60bfce711da4 656:6bdd6923ba16
30 char* _base; 30 char* _base;
31 size_t _size; 31 size_t _size;
32 size_t _noaccess_prefix; 32 size_t _noaccess_prefix;
33 size_t _alignment; 33 size_t _alignment;
34 bool _special; 34 bool _special;
35 bool _executable;
35 36
36 // ReservedSpace 37 // ReservedSpace
37 ReservedSpace(char* base, size_t size, size_t alignment, bool special); 38 ReservedSpace(char* base, size_t size, size_t alignment, bool special,
39 bool executable);
38 void initialize(size_t size, size_t alignment, bool large, 40 void initialize(size_t size, size_t alignment, bool large,
39 char* requested_address, 41 char* requested_address,
40 const size_t noaccess_prefix); 42 const size_t noaccess_prefix,
43 bool executable);
41 44
42 // Release parts of an already-reserved memory region [addr, addr + len) to 45 // Release parts of an already-reserved memory region [addr, addr + len) to
43 // get a new region that has "compound alignment." Return the start of the 46 // get a new region that has "compound alignment." Return the start of the
44 // resulting region, or NULL on failure. 47 // resulting region, or NULL on failure.
45 // 48 //
73 const size_t noaccess_prefix = 0); 76 const size_t noaccess_prefix = 0);
74 ReservedSpace(const size_t prefix_size, const size_t prefix_align, 77 ReservedSpace(const size_t prefix_size, const size_t prefix_align,
75 const size_t suffix_size, const size_t suffix_align, 78 const size_t suffix_size, const size_t suffix_align,
76 char* requested_address, 79 char* requested_address,
77 const size_t noaccess_prefix = 0); 80 const size_t noaccess_prefix = 0);
81 ReservedSpace(size_t size, size_t alignment, bool large, bool executable);
78 82
79 // Accessors 83 // Accessors
80 char* base() const { return _base; } 84 char* base() const { return _base; }
81 size_t size() const { return _size; } 85 size_t size() const { return _size; }
82 size_t alignment() const { return _alignment; } 86 size_t alignment() const { return _alignment; }
83 bool special() const { return _special; } 87 bool special() const { return _special; }
84 88 bool executable() const { return _executable; }
85 size_t noaccess_prefix() const { return _noaccess_prefix; } 89 size_t noaccess_prefix() const { return _noaccess_prefix; }
86 90 bool is_reserved() const { return _base != NULL; }
87 bool is_reserved() const { return _base != NULL; }
88 void release(); 91 void release();
89 92
90 // Splitting 93 // Splitting
91 ReservedSpace first_part(size_t partition_size, size_t alignment, 94 ReservedSpace first_part(size_t partition_size, size_t alignment,
92 bool split = false, bool realloc = true); 95 bool split = false, bool realloc = true);
124 ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align, 127 ReservedHeapSpace(const size_t prefix_size, const size_t prefix_align,
125 const size_t suffix_size, const size_t suffix_align, 128 const size_t suffix_size, const size_t suffix_align,
126 char* requested_address); 129 char* requested_address);
127 }; 130 };
128 131
132 // Class encapsulating behavior specific memory space for Code
133 class ReservedCodeSpace : public ReservedSpace {
134 public:
135 // Constructor
136 ReservedCodeSpace(size_t r_size, size_t rs_align, bool large);
137 };
138
129 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks. 139 // VirtualSpace is data structure for committing a previously reserved address range in smaller chunks.
130 140
131 class VirtualSpace VALUE_OBJ_CLASS_SPEC { 141 class VirtualSpace VALUE_OBJ_CLASS_SPEC {
132 friend class VMStructs; 142 friend class VMStructs;
133 private: 143 private:
140 char* _high; 150 char* _high;
141 151
142 // The entire space has been committed and pinned in memory, no 152 // The entire space has been committed and pinned in memory, no
143 // os::commit_memory() or os::uncommit_memory(). 153 // os::commit_memory() or os::uncommit_memory().
144 bool _special; 154 bool _special;
155
156 // Need to know if commit should be executable.
157 bool _executable;
145 158
146 // MPSS Support 159 // MPSS Support
147 // Each virtualspace region has a lower, middle, and upper region. 160 // Each virtualspace region has a lower, middle, and upper region.
148 // Each region has an end boundary and a high pointer which is the 161 // Each region has an end boundary and a high pointer which is the
149 // high water mark for the last allocated byte. 162 // high water mark for the last allocated byte.