Mercurial > hg > truffle
annotate src/share/vm/memory/resourceArea.hpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 716c64bda5ba |
children | f34d701e952e |
rev | line source |
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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 * | |
1552
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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" | |
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 | |
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71 char* allocate_bytes(size_t size, AllocFailType alloc_failmode = AllocFailStrategy::EXIT_OOM) { |
0 | 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*)); | |
6197 | 78 return (*save = (char*)os::malloc(size, mtThread)); |
0 | 79 } |
80 #endif | |
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81 return (char*)Amalloc(size, alloc_failmode); |
0 | 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; | |
6197 | 96 size_t _size_in_bytes; |
0 | 97 |
98 void initialize(Thread *thread) { | |
99 _area = thread->resource_area(); | |
100 _chunk = _area->_chunk; | |
101 _hwm = _area->_hwm; | |
102 _max= _area->_max; | |
6197 | 103 _size_in_bytes = _area->size_in_bytes(); |
0 | 104 debug_only(_area->_nesting++;) |
105 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
106 } | |
107 public: | |
108 | |
109 #ifndef ASSERT | |
110 ResourceMark(Thread *thread) { | |
111 assert(thread == Thread::current(), "not the current thread"); | |
112 initialize(thread); | |
113 } | |
114 #else | |
115 ResourceMark(Thread *thread); | |
116 #endif // ASSERT | |
117 | |
118 ResourceMark() { initialize(Thread::current()); } | |
119 | |
120 ResourceMark( ResourceArea *r ) : | |
121 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
6197 | 122 _size_in_bytes = r->_size_in_bytes; |
0 | 123 debug_only(_area->_nesting++;) |
124 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
125 } | |
126 | |
127 void reset_to_mark() { | |
128 if (UseMallocOnly) free_malloced_objects(); | |
129 | |
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130 if( _chunk->next() ) { // Delete later chunks |
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131 // reset arena size before delete chunks. Otherwise, the total |
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132 // arena size could exceed total chunk size |
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133 assert(_area->size_in_bytes() > size_in_bytes(), "Sanity check"); |
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134 _area->set_size_in_bytes(size_in_bytes()); |
0 | 135 _chunk->next_chop(); |
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136 } else { |
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137 assert(_area->size_in_bytes() == size_in_bytes(), "Sanity check"); |
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138 } |
0 | 139 _area->_chunk = _chunk; // Roll back arena to saved chunk |
140 _area->_hwm = _hwm; | |
141 _area->_max = _max; | |
142 | |
143 // clear out this chunk (to detect allocation bugs) | |
144 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
145 } | |
146 | |
147 ~ResourceMark() { | |
148 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
149 debug_only(_area->_nesting--;) | |
150 reset_to_mark(); | |
151 } | |
152 | |
153 | |
154 private: | |
155 void free_malloced_objects() PRODUCT_RETURN; | |
6197 | 156 size_t size_in_bytes() { return _size_in_bytes; } |
0 | 157 }; |
158 | |
159 //------------------------------DeoptResourceMark----------------------------------- | |
160 // A deopt resource mark releases all resources allocated after it was constructed | |
161 // when the destructor is called. Typically used as a local variable. It differs | |
162 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
163 // can use data structures that are arena based but are not amenable to vanilla | |
164 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
165 // deoptimization we go thru the following steps: | |
166 // | |
167 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
168 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
169 // This allocates the DeoptResourceMark. | |
170 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
171 // the new skeletal frames. | |
172 // 3: push new stub frame and call unpack_frames | |
173 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
174 // 5: release the DeoptResourceMark | |
175 // 6: return to stub and eventually to interpreter | |
176 // | |
177 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
178 // was no way for the vframeArray to contain resource allocated objects and so | |
179 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
180 // was used. With new style lazy deoptimization the vframeArray is created in the | |
181 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
182 // leveraging existing data structures if we simply create a way to manage this one | |
183 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
184 // then existing ResourceMarks would work fine since no one use new to allocate them | |
185 // and they would be stack allocated. This leaves open the possibilty of accidental | |
186 // misuse so we simple duplicate the ResourceMark functionality here. | |
187 | |
6197 | 188 class DeoptResourceMark: public CHeapObj<mtInternal> { |
0 | 189 protected: |
190 ResourceArea *_area; // Resource area to stack allocate | |
191 Chunk *_chunk; // saved arena chunk | |
192 char *_hwm, *_max; | |
6197 | 193 size_t _size_in_bytes; |
0 | 194 |
195 void initialize(Thread *thread) { | |
196 _area = thread->resource_area(); | |
197 _chunk = _area->_chunk; | |
198 _hwm = _area->_hwm; | |
199 _max= _area->_max; | |
6197 | 200 _size_in_bytes = _area->size_in_bytes(); |
0 | 201 debug_only(_area->_nesting++;) |
202 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
203 } | |
204 | |
205 public: | |
206 | |
207 #ifndef ASSERT | |
208 DeoptResourceMark(Thread *thread) { | |
209 assert(thread == Thread::current(), "not the current thread"); | |
210 initialize(thread); | |
211 } | |
212 #else | |
213 DeoptResourceMark(Thread *thread); | |
214 #endif // ASSERT | |
215 | |
216 DeoptResourceMark() { initialize(Thread::current()); } | |
217 | |
218 DeoptResourceMark( ResourceArea *r ) : | |
219 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
6197 | 220 _size_in_bytes = _area->size_in_bytes(); |
0 | 221 debug_only(_area->_nesting++;) |
222 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
223 } | |
224 | |
225 void reset_to_mark() { | |
226 if (UseMallocOnly) free_malloced_objects(); | |
227 | |
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228 if( _chunk->next() ) { // Delete later chunks |
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229 // reset arena size before delete chunks. Otherwise, the total |
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230 // arena size could exceed total chunk size |
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231 assert(_area->size_in_bytes() > size_in_bytes(), "Sanity check"); |
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232 _area->set_size_in_bytes(size_in_bytes()); |
0 | 233 _chunk->next_chop(); |
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234 } else { |
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235 assert(_area->size_in_bytes() == size_in_bytes(), "Sanity check"); |
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236 } |
0 | 237 _area->_chunk = _chunk; // Roll back arena to saved chunk |
238 _area->_hwm = _hwm; | |
239 _area->_max = _max; | |
240 | |
241 // clear out this chunk (to detect allocation bugs) | |
242 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
243 } | |
244 | |
245 ~DeoptResourceMark() { | |
246 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
247 debug_only(_area->_nesting--;) | |
248 reset_to_mark(); | |
249 } | |
250 | |
251 | |
252 private: | |
253 void free_malloced_objects() PRODUCT_RETURN; | |
6197 | 254 size_t size_in_bytes() { return _size_in_bytes; }; |
0 | 255 }; |
1972 | 256 |
257 #endif // SHARE_VM_MEMORY_RESOURCEAREA_HPP |