Mercurial > hg > graal-compiler
annotate src/share/vm/adlc/arena.hpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
|---|---|
| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | a61af66fc99e |
| children | f95d63e2154a |
| rev | line source |
|---|---|
| 0 | 1 /* |
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6941466: Oracle rebranding changes for Hotspot repositories
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2 * Copyright (c) 1998, 2002, 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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6941466: Oracle rebranding changes for Hotspot repositories
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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 | |
| 25 // All classes in the virtual machine must be subclassed | |
| 26 // by one of the following allocation classes: | |
| 27 // | |
| 28 // | |
| 29 // For objects allocated in the C-heap (managed by: free & malloc). | |
| 30 // - CHeapObj | |
| 31 // | |
| 32 // | |
| 33 // For embedded objects. | |
| 34 // - ValueObj | |
| 35 // | |
| 36 // For classes used as name spaces. | |
| 37 // - AllStatic | |
| 38 // | |
| 39 | |
| 40 class CHeapObj { | |
| 41 public: | |
| 42 void* operator new(size_t size); | |
| 43 void operator delete(void* p); | |
| 44 void* new_array(size_t size); | |
| 45 }; | |
| 46 | |
| 47 | |
| 48 // Base class for objects used as value objects. | |
| 49 // Calling new or delete will result in fatal error. | |
| 50 | |
| 51 class ValueObj { | |
| 52 public: | |
| 53 void* operator new(size_t size); | |
| 54 void operator delete(void* p); | |
| 55 }; | |
| 56 | |
| 57 // Base class for classes that constitute name spaces. | |
| 58 | |
| 59 class AllStatic { | |
| 60 public: | |
| 61 void* operator new(size_t size); | |
| 62 void operator delete(void* p); | |
| 63 }; | |
| 64 | |
| 65 | |
| 66 //------------------------------Chunk------------------------------------------ | |
| 67 // Linked list of raw memory chunks | |
| 68 class Chunk: public CHeapObj { | |
| 69 public: | |
| 70 void* operator new(size_t size, size_t length); | |
| 71 void operator delete(void* p, size_t length); | |
| 72 Chunk(size_t length); | |
| 73 | |
| 74 enum { | |
| 75 init_size = 1*1024, // Size of first chunk | |
| 76 size = 32*1024 // Default size of an Arena chunk (following the first) | |
| 77 }; | |
| 78 Chunk* _next; // Next Chunk in list | |
| 79 size_t _len; // Size of this Chunk | |
| 80 | |
| 81 void chop(); // Chop this chunk | |
| 82 void next_chop(); // Chop next chunk | |
| 83 | |
| 84 // Boundaries of data area (possibly unused) | |
| 85 char* bottom() const { return ((char*) this) + sizeof(Chunk); } | |
| 86 char* top() const { return bottom() + _len; } | |
| 87 }; | |
| 88 | |
| 89 | |
| 90 //------------------------------Arena------------------------------------------ | |
| 91 // Fast allocation of memory | |
| 92 class Arena: public CHeapObj { | |
| 93 protected: | |
| 94 friend class ResourceMark; | |
| 95 friend class HandleMark; | |
| 96 friend class NoHandleMark; | |
| 97 Chunk *_first; // First chunk | |
| 98 Chunk *_chunk; // current chunk | |
| 99 char *_hwm, *_max; // High water mark and max in current chunk | |
| 100 void* grow(size_t x); // Get a new Chunk of at least size x | |
| 101 size_t _size_in_bytes; // Size of arena (used for memory usage tracing) | |
| 102 public: | |
| 103 Arena(); | |
| 104 Arena(size_t init_size); | |
| 105 Arena(Arena *old); | |
| 106 ~Arena() { _first->chop(); } | |
| 107 char* hwm() const { return _hwm; } | |
| 108 | |
| 109 // Fast allocate in the arena. Common case is: pointer test + increment. | |
| 110 void* Amalloc(size_t x) { | |
| 111 #ifdef _LP64 | |
| 112 x = (x + (8-1)) & ((unsigned)(-8)); | |
| 113 #else | |
| 114 x = (x + (4-1)) & ((unsigned)(-4)); | |
| 115 #endif | |
| 116 if (_hwm + x > _max) { | |
| 117 return grow(x); | |
| 118 } else { | |
| 119 char *old = _hwm; | |
| 120 _hwm += x; | |
| 121 return old; | |
| 122 } | |
| 123 } | |
| 124 // Further assume size is padded out to words | |
| 125 // Warning: in LP64, Amalloc_4 is really Amalloc_8 | |
| 126 void *Amalloc_4(size_t x) { | |
| 127 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
| 128 if (_hwm + x > _max) { | |
| 129 return grow(x); | |
| 130 } else { | |
| 131 char *old = _hwm; | |
| 132 _hwm += x; | |
| 133 return old; | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 // Fast delete in area. Common case is: NOP (except for storage reclaimed) | |
| 138 void Afree(void *ptr, size_t size) { | |
| 139 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; | |
| 140 } | |
| 141 | |
| 142 void *Acalloc( size_t items, size_t x ); | |
| 143 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); | |
| 144 | |
| 145 // Reset this Arena to empty, and return this Arenas guts in a new Arena. | |
| 146 Arena *reset(void); | |
| 147 | |
| 148 // Determine if pointer belongs to this Arena or not. | |
| 149 bool contains( const void *ptr ) const; | |
| 150 | |
| 151 // Total of all chunks in use (not thread-safe) | |
| 152 size_t used() const; | |
| 153 | |
| 154 // Total # of bytes used | |
| 155 size_t size_in_bytes() const { return _size_in_bytes; } | |
| 156 void set_size_in_bytes(size_t size) { _size_in_bytes = size; } | |
| 157 }; |