Mercurial > hg > truffle
annotate src/share/vm/memory/resourceArea.hpp @ 2831:f072013daba9
Added lookup method.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Tue, 31 May 2011 11:32:48 +0200 |
parents | f95d63e2154a |
children | f6f3bb0ee072 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, 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 | |
38 | |
0 | 39 // The resource area holds temporary data structures in the VM. |
40 // The actual allocation areas are thread local. Typical usage: | |
41 // | |
42 // ... | |
43 // { | |
44 // ResourceMark rm; | |
45 // int foo[] = NEW_RESOURCE_ARRAY(int, 64); | |
46 // ... | |
47 // } | |
48 // ... | |
49 | |
50 //------------------------------ResourceArea----------------------------------- | |
51 // A ResourceArea is an Arena that supports safe usage of ResourceMark. | |
52 class ResourceArea: public Arena { | |
53 friend class ResourceMark; | |
54 friend class DeoptResourceMark; | |
55 debug_only(int _nesting;) // current # of nested ResourceMarks | |
56 debug_only(static int _warned;) // to suppress multiple warnings | |
57 | |
58 public: | |
59 ResourceArea() { | |
60 debug_only(_nesting = 0;) | |
61 } | |
62 | |
63 ResourceArea(size_t init_size) : Arena(init_size) { | |
64 debug_only(_nesting = 0;); | |
65 } | |
66 | |
67 char* allocate_bytes(size_t size) { | |
68 #ifdef ASSERT | |
69 if (_nesting < 1 && !_warned++) | |
70 fatal("memory leak: allocating without ResourceMark"); | |
71 if (UseMallocOnly) { | |
72 // use malloc, but save pointer in res. area for later freeing | |
73 char** save = (char**)internal_malloc_4(sizeof(char*)); | |
74 return (*save = (char*)os::malloc(size)); | |
75 } | |
76 #endif | |
77 return (char*)Amalloc(size); | |
78 } | |
79 | |
80 debug_only(int nesting() const { return _nesting; }); | |
81 }; | |
82 | |
83 | |
84 //------------------------------ResourceMark----------------------------------- | |
85 // A resource mark releases all resources allocated after it was constructed | |
86 // when the destructor is called. Typically used as a local variable. | |
87 class ResourceMark: public StackObj { | |
88 protected: | |
89 ResourceArea *_area; // Resource area to stack allocate | |
90 Chunk *_chunk; // saved arena chunk | |
91 char *_hwm, *_max; | |
92 NOT_PRODUCT(size_t _size_in_bytes;) | |
93 | |
94 void initialize(Thread *thread) { | |
95 _area = thread->resource_area(); | |
96 _chunk = _area->_chunk; | |
97 _hwm = _area->_hwm; | |
98 _max= _area->_max; | |
99 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
100 debug_only(_area->_nesting++;) | |
101 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
102 } | |
103 | |
104 public: | |
105 | |
106 #ifndef ASSERT | |
107 ResourceMark(Thread *thread) { | |
108 assert(thread == Thread::current(), "not the current thread"); | |
109 initialize(thread); | |
110 } | |
111 #else | |
112 ResourceMark(Thread *thread); | |
113 #endif // ASSERT | |
114 | |
115 ResourceMark() { initialize(Thread::current()); } | |
116 | |
117 ResourceMark( ResourceArea *r ) : | |
118 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
119 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
120 debug_only(_area->_nesting++;) | |
121 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
122 } | |
123 | |
124 void reset_to_mark() { | |
125 if (UseMallocOnly) free_malloced_objects(); | |
126 | |
127 if( _chunk->next() ) // Delete later chunks | |
128 _chunk->next_chop(); | |
129 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
130 _area->_hwm = _hwm; | |
131 _area->_max = _max; | |
132 | |
133 // clear out this chunk (to detect allocation bugs) | |
134 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
135 _area->set_size_in_bytes(size_in_bytes()); | |
136 } | |
137 | |
138 ~ResourceMark() { | |
139 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
140 debug_only(_area->_nesting--;) | |
141 reset_to_mark(); | |
142 } | |
143 | |
144 | |
145 private: | |
146 void free_malloced_objects() PRODUCT_RETURN; | |
147 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
148 }; | |
149 | |
150 //------------------------------DeoptResourceMark----------------------------------- | |
151 // A deopt resource mark releases all resources allocated after it was constructed | |
152 // when the destructor is called. Typically used as a local variable. It differs | |
153 // from a typical resource more in that it is C-Heap allocated so that deoptimization | |
154 // can use data structures that are arena based but are not amenable to vanilla | |
155 // ResourceMarks because deoptimization can not use a stack allocated mark. During | |
156 // deoptimization we go thru the following steps: | |
157 // | |
158 // 0: start in assembly stub and call either uncommon_trap/fetch_unroll_info | |
159 // 1: create the vframeArray (contains pointers to Resource allocated structures) | |
160 // This allocates the DeoptResourceMark. | |
161 // 2: return to assembly stub and remove stub frame and deoptee frame and create | |
162 // the new skeletal frames. | |
163 // 3: push new stub frame and call unpack_frames | |
164 // 4: retrieve information from the vframeArray to populate the skeletal frames | |
165 // 5: release the DeoptResourceMark | |
166 // 6: return to stub and eventually to interpreter | |
167 // | |
168 // With old style eager deoptimization the vframeArray was created by the vmThread there | |
169 // was no way for the vframeArray to contain resource allocated objects and so | |
170 // a complex set of data structures to simulate an array of vframes in CHeap memory | |
171 // was used. With new style lazy deoptimization the vframeArray is created in the | |
172 // the thread that will use it and we can use a much simpler scheme for the vframeArray | |
173 // leveraging existing data structures if we simply create a way to manage this one | |
174 // special need for a ResourceMark. If ResourceMark simply inherited from CHeapObj | |
175 // then existing ResourceMarks would work fine since no one use new to allocate them | |
176 // and they would be stack allocated. This leaves open the possibilty of accidental | |
177 // misuse so we simple duplicate the ResourceMark functionality here. | |
178 | |
179 class DeoptResourceMark: public CHeapObj { | |
180 protected: | |
181 ResourceArea *_area; // Resource area to stack allocate | |
182 Chunk *_chunk; // saved arena chunk | |
183 char *_hwm, *_max; | |
184 NOT_PRODUCT(size_t _size_in_bytes;) | |
185 | |
186 void initialize(Thread *thread) { | |
187 _area = thread->resource_area(); | |
188 _chunk = _area->_chunk; | |
189 _hwm = _area->_hwm; | |
190 _max= _area->_max; | |
191 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
192 debug_only(_area->_nesting++;) | |
193 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
194 } | |
195 | |
196 public: | |
197 | |
198 #ifndef ASSERT | |
199 DeoptResourceMark(Thread *thread) { | |
200 assert(thread == Thread::current(), "not the current thread"); | |
201 initialize(thread); | |
202 } | |
203 #else | |
204 DeoptResourceMark(Thread *thread); | |
205 #endif // ASSERT | |
206 | |
207 DeoptResourceMark() { initialize(Thread::current()); } | |
208 | |
209 DeoptResourceMark( ResourceArea *r ) : | |
210 _area(r), _chunk(r->_chunk), _hwm(r->_hwm), _max(r->_max) { | |
211 NOT_PRODUCT(_size_in_bytes = _area->size_in_bytes();) | |
212 debug_only(_area->_nesting++;) | |
213 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
214 } | |
215 | |
216 void reset_to_mark() { | |
217 if (UseMallocOnly) free_malloced_objects(); | |
218 | |
219 if( _chunk->next() ) // Delete later chunks | |
220 _chunk->next_chop(); | |
221 _area->_chunk = _chunk; // Roll back arena to saved chunk | |
222 _area->_hwm = _hwm; | |
223 _area->_max = _max; | |
224 | |
225 // clear out this chunk (to detect allocation bugs) | |
226 if (ZapResourceArea) memset(_hwm, badResourceValue, _max - _hwm); | |
227 _area->set_size_in_bytes(size_in_bytes()); | |
228 } | |
229 | |
230 ~DeoptResourceMark() { | |
231 assert( _area->_nesting > 0, "must stack allocate RMs" ); | |
232 debug_only(_area->_nesting--;) | |
233 reset_to_mark(); | |
234 } | |
235 | |
236 | |
237 private: | |
238 void free_malloced_objects() PRODUCT_RETURN; | |
239 size_t size_in_bytes() NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
240 }; | |
1972 | 241 |
242 #endif // SHARE_VM_MEMORY_RESOURCEAREA_HPP |