Mercurial > hg > truffle
annotate src/share/vm/adlc/arena.hpp @ 7643:3ac7d10a6572
Merge with hsx25/hotspot.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Thu, 31 Jan 2013 15:42:25 +0100 |
parents | f95d63e2154a |
children | 9758d9f36299 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_ADLC_ARENA_HPP |
26 #define SHARE_VM_ADLC_ARENA_HPP | |
27 | |
0 | 28 // All classes in the virtual machine must be subclassed |
29 // by one of the following allocation classes: | |
30 // | |
31 // | |
32 // For objects allocated in the C-heap (managed by: free & malloc). | |
33 // - CHeapObj | |
34 // | |
35 // | |
36 // For embedded objects. | |
37 // - ValueObj | |
38 // | |
39 // For classes used as name spaces. | |
40 // - AllStatic | |
41 // | |
42 | |
43 class CHeapObj { | |
44 public: | |
45 void* operator new(size_t size); | |
46 void operator delete(void* p); | |
47 void* new_array(size_t size); | |
48 }; | |
49 | |
50 | |
51 // Base class for objects used as value objects. | |
52 // Calling new or delete will result in fatal error. | |
53 | |
54 class ValueObj { | |
55 public: | |
56 void* operator new(size_t size); | |
57 void operator delete(void* p); | |
58 }; | |
59 | |
60 // Base class for classes that constitute name spaces. | |
61 | |
62 class AllStatic { | |
63 public: | |
64 void* operator new(size_t size); | |
65 void operator delete(void* p); | |
66 }; | |
67 | |
68 | |
69 //------------------------------Chunk------------------------------------------ | |
70 // Linked list of raw memory chunks | |
71 class Chunk: public CHeapObj { | |
72 public: | |
73 void* operator new(size_t size, size_t length); | |
74 void operator delete(void* p, size_t length); | |
75 Chunk(size_t length); | |
76 | |
77 enum { | |
78 init_size = 1*1024, // Size of first chunk | |
79 size = 32*1024 // Default size of an Arena chunk (following the first) | |
80 }; | |
81 Chunk* _next; // Next Chunk in list | |
82 size_t _len; // Size of this Chunk | |
83 | |
84 void chop(); // Chop this chunk | |
85 void next_chop(); // Chop next chunk | |
86 | |
87 // Boundaries of data area (possibly unused) | |
88 char* bottom() const { return ((char*) this) + sizeof(Chunk); } | |
89 char* top() const { return bottom() + _len; } | |
90 }; | |
91 | |
92 | |
93 //------------------------------Arena------------------------------------------ | |
94 // Fast allocation of memory | |
95 class Arena: public CHeapObj { | |
96 protected: | |
97 friend class ResourceMark; | |
98 friend class HandleMark; | |
99 friend class NoHandleMark; | |
100 Chunk *_first; // First chunk | |
101 Chunk *_chunk; // current chunk | |
102 char *_hwm, *_max; // High water mark and max in current chunk | |
103 void* grow(size_t x); // Get a new Chunk of at least size x | |
104 size_t _size_in_bytes; // Size of arena (used for memory usage tracing) | |
105 public: | |
106 Arena(); | |
107 Arena(size_t init_size); | |
108 Arena(Arena *old); | |
109 ~Arena() { _first->chop(); } | |
110 char* hwm() const { return _hwm; } | |
111 | |
112 // Fast allocate in the arena. Common case is: pointer test + increment. | |
113 void* Amalloc(size_t x) { | |
114 #ifdef _LP64 | |
115 x = (x + (8-1)) & ((unsigned)(-8)); | |
116 #else | |
117 x = (x + (4-1)) & ((unsigned)(-4)); | |
118 #endif | |
119 if (_hwm + x > _max) { | |
120 return grow(x); | |
121 } else { | |
122 char *old = _hwm; | |
123 _hwm += x; | |
124 return old; | |
125 } | |
126 } | |
127 // Further assume size is padded out to words | |
128 // Warning: in LP64, Amalloc_4 is really Amalloc_8 | |
129 void *Amalloc_4(size_t x) { | |
130 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
131 if (_hwm + x > _max) { | |
132 return grow(x); | |
133 } else { | |
134 char *old = _hwm; | |
135 _hwm += x; | |
136 return old; | |
137 } | |
138 } | |
139 | |
140 // Fast delete in area. Common case is: NOP (except for storage reclaimed) | |
141 void Afree(void *ptr, size_t size) { | |
142 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; | |
143 } | |
144 | |
145 void *Acalloc( size_t items, size_t x ); | |
146 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); | |
147 | |
148 // Reset this Arena to empty, and return this Arenas guts in a new Arena. | |
149 Arena *reset(void); | |
150 | |
151 // Determine if pointer belongs to this Arena or not. | |
152 bool contains( const void *ptr ) const; | |
153 | |
154 // Total of all chunks in use (not thread-safe) | |
155 size_t used() const; | |
156 | |
157 // Total # of bytes used | |
158 size_t size_in_bytes() const { return _size_in_bytes; } | |
159 void set_size_in_bytes(size_t size) { _size_in_bytes = size; } | |
160 }; | |
1972 | 161 |
162 #endif // SHARE_VM_ADLC_ARENA_HPP |