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annotate src/share/vm/adlc/arena.hpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | c18cbe5936b8 |
| children | 9758d9f36299 |
| rev | line source |
|---|---|
| 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 |