Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/resourceArea.hpp @ 7180:f34d701e952e
8003935: Simplify the needed includes for using Thread::current()
Reviewed-by: dholmes, rbackman, coleenp
| author | stefank |
|---|---|
| date | Tue, 27 Nov 2012 14:20:21 +0100 |
| parents | 716c64bda5ba |
| children | dbc0b5dc08f5 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 6197 | 2 * Copyright (c) 1997, 2012, 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_MEMORY_RESOURCEAREA_HPP |
| 26 #define SHARE_VM_MEMORY_RESOURCEAREA_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
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29 #include "runtime/thread.inline.hpp" |
| 1972 | 30 |
| 0 | 31 // The resource area holds temporary data structures in the VM. |
| 32 // The actual allocation areas are thread local. Typical usage: | |
| 33 // | |
| 34 // ... | |
| 35 // { | |
| 36 // ResourceMark rm; | |
| 37 // int foo[] = NEW_RESOURCE_ARRAY(int, 64); | |
| 38 // ... | |
| 39 // } | |
| 40 // ... | |
| 41 | |
| 42 //------------------------------ResourceArea----------------------------------- | |
| 43 // A ResourceArea is an Arena that supports safe usage of ResourceMark. | |
| 44 class ResourceArea: public Arena { | |
| 45 friend class ResourceMark; | |
| 46 friend class DeoptResourceMark; | |
| 3939 | 47 friend class VMStructs; |
| 0 | 48 debug_only(int _nesting;) // current # of nested ResourceMarks |
| 49 debug_only(static int _warned;) // to suppress multiple warnings | |
| 50 | |
| 51 public: | |
| 52 ResourceArea() { | |
| 53 debug_only(_nesting = 0;) | |
| 54 } | |
| 55 | |
| 56 ResourceArea(size_t init_size) : Arena(init_size) { | |
| 57 debug_only(_nesting = 0;); | |
| 58 } | |
| 59 | |
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60 char* allocate_bytes(size_t size, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { |
| 0 | 61 #ifdef ASSERT |
| 62 if (_nesting < 1 && !_warned++) | |
| 63 fatal("memory leak: allocating without ResourceMark"); | |
| 64 if (UseMallocOnly) { | |
| 65 // use malloc, but save pointer in res. area for later freeing | |
| 66 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
| 6197 | 67 return (*save = (char*)os::malloc(size, mtThread)); |
| 0 | 68 } |
| 69 #endif | |
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70 return (char*)Amalloc(size, alloc_failmode); |
| 0 | 71 } |
| 72 | |
| 73 debug_only(int nesting() const { return _nesting; }); | |
| 74 }; | |
| 75 | |
| 76 | |
| 77 //------------------------------ResourceMark----------------------------------- | |
| 78 // A resource mark releases all resources allocated after it was constructed | |
| 79 // when the destructor is called. Typically used as a local variable. | |
| 80 class ResourceMark: public StackObj { | |
| 81 protected: | |
| 82 ResourceArea *_area; // Resource area to stack allocate | |
| 83 Chunk *_chunk; // saved arena chunk | |
| 84 char *_hwm, *_max; | |
| 6197 | 85 size_t _size_in_bytes; |
| 0 | 86 |
| 87 void initialize(Thread *thread) { | |
| 88 _area = thread->resource_area(); | |
| 89 _chunk = _area->_chunk; | |
| 90 _hwm = _area->_hwm; | |
| 91 _max= _area->_max; | |
| 6197 | 92 _size_in_bytes = _area->size_in_bytes(); |
| 0 | 93 debug_only(_area->_nesting++;) |
| 94 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 95 } | |
| 96 public: | |
| 97 | |
| 98 #ifndef ASSERT | |
| 99 ResourceMark(Thread *thread) { | |
| 100 assert(thread == Thread::current(), "not the current thread"); | |
| 101 initialize(thread); | |
| 102 } | |
| 103 #else | |
| 104 ResourceMark(Thread *thread); | |
| 105 #endif // ASSERT | |
| 106 | |
| 107 ResourceMark() { initialize(Thread::current()); } | |
| 108 | |
| 109 ResourceMark( ResourceArea *r ) : | |
| 110 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 6197 | 111 _size_in_bytes = r->_size_in_bytes; |
| 0 | 112 debug_only(_area->_nesting++;) |
| 113 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 114 } | |
| 115 | |
| 116 void reset_to_mark() { | |
| 117 if (UseMallocOnly) free_malloced_objects(); | |
| 118 | |
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119 if( _chunk->next() ) { // Delete later chunks |
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120 // reset arena size before delete chunks. Otherwise, the total |
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121 // arena size could exceed total chunk size |
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122 assert(_area->size_in_bytes() > size_in_bytes(), "Sanity check"); |
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123 _area->set_size_in_bytes(size_in_bytes()); |
| 0 | 124 _chunk->next_chop(); |
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125 } else { |
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126 assert(_area->size_in_bytes() == size_in_bytes(), "Sanity check"); |
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127 } |
| 0 | 128 _area->_chunk = _chunk; // Roll back arena to saved chunk |
| 129 _area->_hwm = _hwm; | |
| 130 _area->_max = _max; | |
| 131 | |
| 132 // clear out this chunk (to detect allocation bugs) | |
| 133 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 134 } | |
| 135 | |
| 136 ~ResourceMark() { | |
| 137 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 138 debug_only(_area->_nesting--;) | |
| 139 reset_to_mark(); | |
| 140 } | |
| 141 | |
| 142 | |
| 143 private: | |
| 144 void free_malloced_objects() PRODUCT_RETURN; | |
| 6197 | 145 size_t size_in_bytes() { return _size_in_bytes; } |
| 0 | 146 }; |
| 147 | |
| 148 //------------------------------DeoptResourceMark----------------------------------- | |
| 149 // A deopt resource mark releases all resources allocated after it was constructed | |
| 150 // when the destructor is called. Typically used as a local variable. It differs | |
| 151 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
| 152 // can use data structures that are arena based but are not amenable to vanilla | |
| 153 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
| 154 // deoptimization we go thru the following steps: | |
| 155 // | |
| 156 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
| 157 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
| 158 // This allocates the DeoptResourceMark. | |
| 159 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
| 160 // the new skeletal frames. | |
| 161 // 3: push new stub frame and call unpack_frames | |
| 162 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
| 163 // 5: release the DeoptResourceMark | |
| 164 // 6: return to stub and eventually to interpreter | |
| 165 // | |
| 166 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
| 167 // was no way for the vframeArray to contain resource allocated objects and so | |
| 168 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
| 169 // was used. With new style lazy deoptimization the vframeArray is created in the | |
| 170 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
| 171 // leveraging existing data structures if we simply create a way to manage this one | |
| 172 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
| 173 // then existing ResourceMarks would work fine since no one use new to allocate them | |
| 174 // and they would be stack allocated. This leaves open the possibilty of accidental | |
| 175 // misuse so we simple duplicate the ResourceMark functionality here. | |
| 176 | |
| 6197 | 177 class DeoptResourceMark: public CHeapObj<mtInternal> { |
| 0 | 178 protected: |
| 179 ResourceArea *_area; // Resource area to stack allocate | |
| 180 Chunk *_chunk; // saved arena chunk | |
| 181 char *_hwm, *_max; | |
| 6197 | 182 size_t _size_in_bytes; |
| 0 | 183 |
| 184 void initialize(Thread *thread) { | |
| 185 _area = thread->resource_area(); | |
| 186 _chunk = _area->_chunk; | |
| 187 _hwm = _area->_hwm; | |
| 188 _max= _area->_max; | |
| 6197 | 189 _size_in_bytes = _area->size_in_bytes(); |
| 0 | 190 debug_only(_area->_nesting++;) |
| 191 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 192 } | |
| 193 | |
| 194 public: | |
| 195 | |
| 196 #ifndef ASSERT | |
| 197 DeoptResourceMark(Thread *thread) { | |
| 198 assert(thread == Thread::current(), "not the current thread"); | |
| 199 initialize(thread); | |
| 200 } | |
| 201 #else | |
| 202 DeoptResourceMark(Thread *thread); | |
| 203 #endif // ASSERT | |
| 204 | |
| 205 DeoptResourceMark() { initialize(Thread::current()); } | |
| 206 | |
| 207 DeoptResourceMark( ResourceArea *r ) : | |
| 208 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 6197 | 209 _size_in_bytes = _area->size_in_bytes(); |
| 0 | 210 debug_only(_area->_nesting++;) |
| 211 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 212 } | |
| 213 | |
| 214 void reset_to_mark() { | |
| 215 if (UseMallocOnly) free_malloced_objects(); | |
| 216 | |
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217 if( _chunk->next() ) { // Delete later chunks |
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218 // reset arena size before delete chunks. Otherwise, the total |
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219 // arena size could exceed total chunk size |
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220 assert(_area->size_in_bytes() > size_in_bytes(), "Sanity check"); |
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221 _area->set_size_in_bytes(size_in_bytes()); |
| 0 | 222 _chunk->next_chop(); |
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223 } else { |
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224 assert(_area->size_in_bytes() == size_in_bytes(), "Sanity check"); |
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225 } |
| 0 | 226 _area->_chunk = _chunk; // Roll back arena to saved chunk |
| 227 _area->_hwm = _hwm; | |
| 228 _area->_max = _max; | |
| 229 | |
| 230 // clear out this chunk (to detect allocation bugs) | |
| 231 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 232 } | |
| 233 | |
| 234 ~DeoptResourceMark() { | |
| 235 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 236 debug_only(_area->_nesting--;) | |
| 237 reset_to_mark(); | |
| 238 } | |
| 239 | |
| 240 | |
| 241 private: | |
| 242 void free_malloced_objects() PRODUCT_RETURN; | |
| 6197 | 243 size_t size_in_bytes() { return _size_in_bytes; }; |
| 0 | 244 }; |
| 1972 | 245 |
| 246 #endif // SHARE_VM_MEMORY_RESOURCEAREA_HPP |