Wed, 22 Jan 2014 17:42:23 -0800
Merge
duke@435 | 1 | /* |
coleenp@5614 | 2 | * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
duke@435 | 4 | * |
duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
duke@435 | 7 | * published by the Free Software Foundation. |
duke@435 | 8 | * |
duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
duke@435 | 13 | * accompanied this code). |
duke@435 | 14 | * |
duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
duke@435 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
duke@435 | 22 | * |
duke@435 | 23 | */ |
duke@435 | 24 | |
stefank@2314 | 25 | #ifndef SHARE_VM_ADLC_ARENA_HPP |
stefank@2314 | 26 | #define SHARE_VM_ADLC_ARENA_HPP |
stefank@2314 | 27 | |
duke@435 | 28 | // All classes in the virtual machine must be subclassed |
duke@435 | 29 | // by one of the following allocation classes: |
duke@435 | 30 | // |
duke@435 | 31 | // |
duke@435 | 32 | // For objects allocated in the C-heap (managed by: free & malloc). |
duke@435 | 33 | // - CHeapObj |
duke@435 | 34 | // |
duke@435 | 35 | // |
duke@435 | 36 | // For embedded objects. |
duke@435 | 37 | // - ValueObj |
duke@435 | 38 | // |
duke@435 | 39 | // For classes used as name spaces. |
duke@435 | 40 | // - AllStatic |
duke@435 | 41 | // |
duke@435 | 42 | |
duke@435 | 43 | class CHeapObj { |
duke@435 | 44 | public: |
coleenp@5614 | 45 | void* operator new(size_t size) throw(); |
duke@435 | 46 | void operator delete(void* p); |
duke@435 | 47 | void* new_array(size_t size); |
duke@435 | 48 | }; |
duke@435 | 49 | |
duke@435 | 50 | |
duke@435 | 51 | // Base class for objects used as value objects. |
duke@435 | 52 | // Calling new or delete will result in fatal error. |
duke@435 | 53 | |
duke@435 | 54 | class ValueObj { |
duke@435 | 55 | public: |
coleenp@5614 | 56 | void* operator new(size_t size) throw(); |
duke@435 | 57 | void operator delete(void* p); |
duke@435 | 58 | }; |
duke@435 | 59 | |
duke@435 | 60 | // Base class for classes that constitute name spaces. |
duke@435 | 61 | |
duke@435 | 62 | class AllStatic { |
duke@435 | 63 | public: |
coleenp@5614 | 64 | void* operator new(size_t size) throw(); |
duke@435 | 65 | void operator delete(void* p); |
duke@435 | 66 | }; |
duke@435 | 67 | |
duke@435 | 68 | |
duke@435 | 69 | //------------------------------Chunk------------------------------------------ |
duke@435 | 70 | // Linked list of raw memory chunks |
duke@435 | 71 | class Chunk: public CHeapObj { |
duke@435 | 72 | public: |
coleenp@5614 | 73 | void* operator new(size_t size, size_t length) throw(); |
duke@435 | 74 | void operator delete(void* p, size_t length); |
duke@435 | 75 | Chunk(size_t length); |
duke@435 | 76 | |
duke@435 | 77 | enum { |
duke@435 | 78 | init_size = 1*1024, // Size of first chunk |
duke@435 | 79 | size = 32*1024 // Default size of an Arena chunk (following the first) |
duke@435 | 80 | }; |
duke@435 | 81 | Chunk* _next; // Next Chunk in list |
duke@435 | 82 | size_t _len; // Size of this Chunk |
duke@435 | 83 | |
duke@435 | 84 | void chop(); // Chop this chunk |
duke@435 | 85 | void next_chop(); // Chop next chunk |
duke@435 | 86 | |
duke@435 | 87 | // Boundaries of data area (possibly unused) |
duke@435 | 88 | char* bottom() const { return ((char*) this) + sizeof(Chunk); } |
duke@435 | 89 | char* top() const { return bottom() + _len; } |
duke@435 | 90 | }; |
duke@435 | 91 | |
duke@435 | 92 | |
duke@435 | 93 | //------------------------------Arena------------------------------------------ |
duke@435 | 94 | // Fast allocation of memory |
duke@435 | 95 | class Arena: public CHeapObj { |
duke@435 | 96 | protected: |
duke@435 | 97 | friend class ResourceMark; |
duke@435 | 98 | friend class HandleMark; |
duke@435 | 99 | friend class NoHandleMark; |
duke@435 | 100 | Chunk *_first; // First chunk |
duke@435 | 101 | Chunk *_chunk; // current chunk |
duke@435 | 102 | char *_hwm, *_max; // High water mark and max in current chunk |
duke@435 | 103 | void* grow(size_t x); // Get a new Chunk of at least size x |
duke@435 | 104 | size_t _size_in_bytes; // Size of arena (used for memory usage tracing) |
duke@435 | 105 | public: |
duke@435 | 106 | Arena(); |
duke@435 | 107 | Arena(size_t init_size); |
duke@435 | 108 | Arena(Arena *old); |
duke@435 | 109 | ~Arena() { _first->chop(); } |
duke@435 | 110 | char* hwm() const { return _hwm; } |
duke@435 | 111 | |
duke@435 | 112 | // Fast allocate in the arena. Common case is: pointer test + increment. |
duke@435 | 113 | void* Amalloc(size_t x) { |
duke@435 | 114 | #ifdef _LP64 |
duke@435 | 115 | x = (x + (8-1)) & ((unsigned)(-8)); |
duke@435 | 116 | #else |
duke@435 | 117 | x = (x + (4-1)) & ((unsigned)(-4)); |
duke@435 | 118 | #endif |
duke@435 | 119 | if (_hwm + x > _max) { |
duke@435 | 120 | return grow(x); |
duke@435 | 121 | } else { |
duke@435 | 122 | char *old = _hwm; |
duke@435 | 123 | _hwm += x; |
duke@435 | 124 | return old; |
duke@435 | 125 | } |
duke@435 | 126 | } |
duke@435 | 127 | // Further assume size is padded out to words |
duke@435 | 128 | // Warning: in LP64, Amalloc_4 is really Amalloc_8 |
duke@435 | 129 | void *Amalloc_4(size_t x) { |
duke@435 | 130 | assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); |
duke@435 | 131 | if (_hwm + x > _max) { |
duke@435 | 132 | return grow(x); |
duke@435 | 133 | } else { |
duke@435 | 134 | char *old = _hwm; |
duke@435 | 135 | _hwm += x; |
duke@435 | 136 | return old; |
duke@435 | 137 | } |
duke@435 | 138 | } |
duke@435 | 139 | |
duke@435 | 140 | // Fast delete in area. Common case is: NOP (except for storage reclaimed) |
duke@435 | 141 | void Afree(void *ptr, size_t size) { |
duke@435 | 142 | if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; |
duke@435 | 143 | } |
duke@435 | 144 | |
duke@435 | 145 | void *Acalloc( size_t items, size_t x ); |
duke@435 | 146 | void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); |
duke@435 | 147 | |
duke@435 | 148 | // Reset this Arena to empty, and return this Arenas guts in a new Arena. |
duke@435 | 149 | Arena *reset(void); |
duke@435 | 150 | |
duke@435 | 151 | // Determine if pointer belongs to this Arena or not. |
duke@435 | 152 | bool contains( const void *ptr ) const; |
duke@435 | 153 | |
duke@435 | 154 | // Total of all chunks in use (not thread-safe) |
duke@435 | 155 | size_t used() const; |
duke@435 | 156 | |
duke@435 | 157 | // Total # of bytes used |
duke@435 | 158 | size_t size_in_bytes() const { return _size_in_bytes; } |
duke@435 | 159 | void set_size_in_bytes(size_t size) { _size_in_bytes = size; } |
duke@435 | 160 | }; |
stefank@2314 | 161 | |
stefank@2314 | 162 | #endif // SHARE_VM_ADLC_ARENA_HPP |