Mercurial > hg > graal-jvmci-8
annotate src/share/vm/memory/resourceArea.hpp @ 3960:f08d439fab8c
7089790: integrate bsd-port changes
Reviewed-by: kvn, twisti, jrose
Contributed-by: Kurt Miller <kurt@intricatesoftware.com>, Greg Lewis <glewis@eyesbeyond.com>, Jung-uk Kim <jkim@freebsd.org>, Christos Zoulas <christos@zoulas.com>, Landon Fuller <landonf@plausible.coop>, The FreeBSD Foundation <board@freebsdfoundation.org>, Michael Franz <mvfranz@gmail.com>, Roger Hoover <rhoover@apple.com>, Alexander Strange <astrange@apple.com>
| author | never |
|---|---|
| date | Sun, 25 Sep 2011 16:03:29 -0700 |
| parents | f6f3bb0ee072 |
| children | d2a62e0f25eb |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 3939 | 2 * Copyright (c) 1997, 2011, 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 * | |
|
1552
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
|
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
0
diff
changeset
|
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" | |
| 29 #ifdef TARGET_OS_FAMILY_linux | |
| 30 # include "thread_linux.inline.hpp" | |
| 31 #endif | |
| 32 #ifdef TARGET_OS_FAMILY_solaris | |
| 33 # include "thread_solaris.inline.hpp" | |
| 34 #endif | |
| 35 #ifdef TARGET_OS_FAMILY_windows | |
| 36 # include "thread_windows.inline.hpp" | |
| 37 #endif | |
| 3960 | 38 #ifdef TARGET_OS_FAMILY_bsd |
| 39 # include "thread_bsd.inline.hpp" | |
| 40 #endif | |
| 1972 | 41 |
| 0 | 42 // The resource area holds temporary data structures in the VM. |
| 43 // The actual allocation areas are thread local. Typical usage: | |
| 44 // | |
| 45 // ... | |
| 46 // { | |
| 47 // ResourceMark rm; | |
| 48 // int foo[] = NEW_RESOURCE_ARRAY(int, 64); | |
| 49 // ... | |
| 50 // } | |
| 51 // ... | |
| 52 | |
| 53 //------------------------------ResourceArea----------------------------------- | |
| 54 // A ResourceArea is an Arena that supports safe usage of ResourceMark. | |
| 55 class ResourceArea: public Arena { | |
| 56 friend class ResourceMark; | |
| 57 friend class DeoptResourceMark; | |
| 3939 | 58 friend class VMStructs; |
| 0 | 59 debug_only(int _nesting;) // current # of nested ResourceMarks |
| 60 debug_only(static int _warned;) // to suppress multiple warnings | |
| 61 | |
| 62 public: | |
| 63 ResourceArea() { | |
| 64 debug_only(_nesting = 0;) | |
| 65 } | |
| 66 | |
| 67 ResourceArea(size_t init_size) : Arena(init_size) { | |
| 68 debug_only(_nesting = 0;); | |
| 69 } | |
| 70 | |
| 71 char* allocate_bytes(size_t size) { | |
| 72 #ifdef ASSERT | |
| 73 if (_nesting < 1 && !_warned++) | |
| 74 fatal("memory leak: allocating without ResourceMark"); | |
| 75 if (UseMallocOnly) { | |
| 76 // use malloc, but save pointer in res. area for later freeing | |
| 77 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
| 78 return (*save = (char*)os::malloc(size)); | |
| 79 } | |
| 80 #endif | |
| 81 return (char*)Amalloc(size); | |
| 82 } | |
| 83 | |
| 84 debug_only(int nesting() const { return _nesting; }); | |
| 85 }; | |
| 86 | |
| 87 | |
| 88 //------------------------------ResourceMark----------------------------------- | |
| 89 // A resource mark releases all resources allocated after it was constructed | |
| 90 // when the destructor is called. Typically used as a local variable. | |
| 91 class ResourceMark: public StackObj { | |
| 92 protected: | |
| 93 ResourceArea *_area; // Resource area to stack allocate | |
| 94 Chunk *_chunk; // saved arena chunk | |
| 95 char *_hwm, *_max; | |
| 96 NOT_PRODUCT(size_t _size_in_bytes;) | |
| 97 | |
| 98 void initialize(Thread *thread) { | |
| 99 _area = thread->resource_area(); | |
| 100 _chunk = _area->_chunk; | |
| 101 _hwm = _area->_hwm; | |
| 102 _max= _area->_max; | |
| 103 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 104 debug_only(_area->_nesting++;) | |
| 105 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 106 } | |
| 107 | |
| 108 public: | |
| 109 | |
| 110 #ifndef ASSERT | |
| 111 ResourceMark(Thread *thread) { | |
| 112 assert(thread == Thread::current(), "not the current thread"); | |
| 113 initialize(thread); | |
| 114 } | |
| 115 #else | |
| 116 ResourceMark(Thread *thread); | |
| 117 #endif // ASSERT | |
| 118 | |
| 119 ResourceMark() { initialize(Thread::current()); } | |
| 120 | |
| 121 ResourceMark( ResourceArea *r ) : | |
| 122 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 123 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 124 debug_only(_area->_nesting++;) | |
| 125 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 126 } | |
| 127 | |
| 128 void reset_to_mark() { | |
| 129 if (UseMallocOnly) free_malloced_objects(); | |
| 130 | |
| 131 if( _chunk->next() ) // Delete later chunks | |
| 132 _chunk->next_chop(); | |
| 133 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
| 134 _area->_hwm = _hwm; | |
| 135 _area->_max = _max; | |
| 136 | |
| 137 // clear out this chunk (to detect allocation bugs) | |
| 138 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 139 _area->set_size_in_bytes(size_in_bytes()); | |
| 140 } | |
| 141 | |
| 142 ~ResourceMark() { | |
| 143 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 144 debug_only(_area->_nesting--;) | |
| 145 reset_to_mark(); | |
| 146 } | |
| 147 | |
| 148 | |
| 149 private: | |
| 150 void free_malloced_objects() PRODUCT_RETURN; | |
| 151 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
| 152 }; | |
| 153 | |
| 154 //------------------------------DeoptResourceMark----------------------------------- | |
| 155 // A deopt resource mark releases all resources allocated after it was constructed | |
| 156 // when the destructor is called. Typically used as a local variable. It differs | |
| 157 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
| 158 // can use data structures that are arena based but are not amenable to vanilla | |
| 159 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
| 160 // deoptimization we go thru the following steps: | |
| 161 // | |
| 162 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
| 163 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
| 164 // This allocates the DeoptResourceMark. | |
| 165 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
| 166 // the new skeletal frames. | |
| 167 // 3: push new stub frame and call unpack_frames | |
| 168 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
| 169 // 5: release the DeoptResourceMark | |
| 170 // 6: return to stub and eventually to interpreter | |
| 171 // | |
| 172 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
| 173 // was no way for the vframeArray to contain resource allocated objects and so | |
| 174 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
| 175 // was used. With new style lazy deoptimization the vframeArray is created in the | |
| 176 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
| 177 // leveraging existing data structures if we simply create a way to manage this one | |
| 178 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
| 179 // then existing ResourceMarks would work fine since no one use new to allocate them | |
| 180 // and they would be stack allocated. This leaves open the possibilty of accidental | |
| 181 // misuse so we simple duplicate the ResourceMark functionality here. | |
| 182 | |
| 183 class DeoptResourceMark: public CHeapObj { | |
| 184 protected: | |
| 185 ResourceArea *_area; // Resource area to stack allocate | |
| 186 Chunk *_chunk; // saved arena chunk | |
| 187 char *_hwm, *_max; | |
| 188 NOT_PRODUCT(size_t _size_in_bytes;) | |
| 189 | |
| 190 void initialize(Thread *thread) { | |
| 191 _area = thread->resource_area(); | |
| 192 _chunk = _area->_chunk; | |
| 193 _hwm = _area->_hwm; | |
| 194 _max= _area->_max; | |
| 195 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 196 debug_only(_area->_nesting++;) | |
| 197 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 198 } | |
| 199 | |
| 200 public: | |
| 201 | |
| 202 #ifndef ASSERT | |
| 203 DeoptResourceMark(Thread *thread) { | |
| 204 assert(thread == Thread::current(), "not the current thread"); | |
| 205 initialize(thread); | |
| 206 } | |
| 207 #else | |
| 208 DeoptResourceMark(Thread *thread); | |
| 209 #endif // ASSERT | |
| 210 | |
| 211 DeoptResourceMark() { initialize(Thread::current()); } | |
| 212 | |
| 213 DeoptResourceMark( ResourceArea *r ) : | |
| 214 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
| 215 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
| 216 debug_only(_area->_nesting++;) | |
| 217 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
| 218 } | |
| 219 | |
| 220 void reset_to_mark() { | |
| 221 if (UseMallocOnly) free_malloced_objects(); | |
| 222 | |
| 223 if( _chunk->next() ) // Delete later chunks | |
| 224 _chunk->next_chop(); | |
| 225 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
| 226 _area->_hwm = _hwm; | |
| 227 _area->_max = _max; | |
| 228 | |
| 229 // clear out this chunk (to detect allocation bugs) | |
| 230 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
| 231 _area->set_size_in_bytes(size_in_bytes()); | |
| 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; | |
| 243 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
| 244 }; | |
| 1972 | 245 |
| 246 #endif // SHARE_VM_MEMORY_RESOURCEAREA_HPP |