Mercurial > hg > truffle
annotate src/share/vm/memory/resourceArea.hpp @ 6139:0919b2e7895d
7174510: 19 JCK compiler tests fail with C2 error: memNode.cpp:812 - ShouldNotReachHere
Summary: Add missing check for EncodeP node in MemNode::Ideal_common_DU_postCCP() method.
Reviewed-by: twisti
author | kvn |
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date | Mon, 11 Jun 2012 14:58:51 -0700 |
parents | f08d439fab8c |
children | d2a62e0f25eb |
rev | line source |
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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
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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 | |
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 |