Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/handles.cpp @ 1782:f353275af40e
6981773: incorrect fill value with OptimizeFill
Reviewed-by: kvn, twisti
author | never |
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date | Thu, 02 Sep 2010 11:40:02 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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5 * This code is free software; you can redistribute it and/or modify it | |
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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 | |
25 # include "incls/_precompiled.incl" | |
26 # include "incls/_handles.cpp.incl" | |
27 | |
28 #ifdef ASSERT | |
29 oop* HandleArea::allocate_handle(oop obj) { | |
30 assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark"); | |
31 assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark"); | |
32 assert(SharedSkipVerify || obj->is_oop(), "sanity check"); | |
33 return real_allocate_handle(obj); | |
34 } | |
35 | |
36 Handle::Handle(Thread* thread, oop obj) { | |
37 assert(thread == Thread::current(), "sanity check"); | |
38 if (obj == NULL) { | |
39 _handle = NULL; | |
40 } else { | |
41 _handle = thread->handle_area()->allocate_handle(obj); | |
42 } | |
43 } | |
44 | |
45 #endif | |
46 | |
47 static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) { | |
48 oop* bottom = (oop*) chunk->bottom(); | |
49 oop* top = (oop*) chunk_top; | |
50 uintx handles_visited = top - bottom; | |
51 assert(top >= bottom && top <= (oop*) chunk->top(), "just checking"); | |
52 // during GC phase 3, a handle may be a forward pointer that | |
53 // is not yet valid, so loosen the assertion | |
54 while (bottom < top) { | |
55 // assert((*bottom)->is_oop(), "handle should point to oop"); | |
56 assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address"); | |
57 f->do_oop(bottom++); | |
58 } | |
59 return handles_visited; | |
60 } | |
61 | |
62 // Used for debugging handle allocation. | |
63 NOT_PRODUCT(jint _nof_handlemarks = 0;) | |
64 | |
65 void HandleArea::oops_do(OopClosure* f) { | |
66 uintx handles_visited = 0; | |
67 // First handle the current chunk. It is filled to the high water mark. | |
68 handles_visited += chunk_oops_do(f, _chunk, _hwm); | |
69 // Then handle all previous chunks. They are completely filled. | |
70 Chunk* k = _first; | |
71 while(k != _chunk) { | |
72 handles_visited += chunk_oops_do(f, k, k->top()); | |
73 k = k->next(); | |
74 } | |
75 | |
76 // The thread local handle areas should not get very large | |
77 if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) { | |
78 #ifdef ASSERT | |
79 warning("%d: Visited in HandleMark : %d", | |
80 _nof_handlemarks, handles_visited); | |
81 #else | |
82 warning("Visited in HandleMark : %d", handles_visited); | |
83 #endif | |
84 } | |
85 if (_prev != NULL) _prev->oops_do(f); | |
86 } | |
87 | |
88 void HandleMark::initialize(Thread* thread) { | |
89 _thread = thread; | |
90 // Save area | |
91 _area = thread->handle_area(); | |
92 // Save current top | |
93 _chunk = _area->_chunk; | |
94 _hwm = _area->_hwm; | |
95 _max = _area->_max; | |
96 NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;) | |
97 debug_only(_area->_handle_mark_nesting++); | |
98 assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks"); | |
99 debug_only(Atomic::inc(&_nof_handlemarks);) | |
100 | |
101 // Link this in the thread | |
102 set_previous_handle_mark(thread->last_handle_mark()); | |
103 thread->set_last_handle_mark(this); | |
104 } | |
105 | |
106 | |
107 HandleMark::~HandleMark() { | |
108 HandleArea* area = _area; // help compilers with poor alias analysis | |
109 assert(area == _thread->handle_area(), "sanity check"); | |
110 assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" ); | |
111 debug_only(area->_handle_mark_nesting--); | |
112 | |
113 // Debug code to trace the number of handles allocated per mark/ | |
114 #ifdef ASSERT | |
115 if (TraceHandleAllocation) { | |
116 size_t handles = 0; | |
117 Chunk *c = _chunk->next(); | |
118 if (c == NULL) { | |
119 handles = area->_hwm - _hwm; // no new chunk allocated | |
120 } else { | |
121 handles = _max - _hwm; // add rest in first chunk | |
122 while(c != NULL) { | |
123 handles += c->length(); | |
124 c = c->next(); | |
125 } | |
126 handles -= area->_max - area->_hwm; // adjust for last trunk not full | |
127 } | |
128 handles /= sizeof(void *); // Adjust for size of a handle | |
129 if (handles > HandleAllocationLimit) { | |
130 // Note: _nof_handlemarks is only set in debug mode | |
131 warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles); | |
132 } | |
133 } | |
134 #endif | |
135 | |
136 // Delete later chunks | |
137 if( _chunk->next() ) { | |
138 _chunk->next_chop(); | |
139 } | |
140 // Roll back arena to saved top markers | |
141 area->_chunk = _chunk; | |
142 area->_hwm = _hwm; | |
143 area->_max = _max; | |
144 NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);) | |
145 #ifdef ASSERT | |
146 // clear out first chunk (to detect allocation bugs) | |
147 if (ZapVMHandleArea) { | |
148 memset(_hwm, badHandleValue, _max - _hwm); | |
149 } | |
150 Atomic::dec(&_nof_handlemarks); | |
151 #endif | |
152 | |
153 // Unlink this from the thread | |
154 _thread->set_last_handle_mark(previous_handle_mark()); | |
155 } | |
156 | |
157 #ifdef ASSERT | |
158 | |
159 NoHandleMark::NoHandleMark() { | |
160 HandleArea* area = Thread::current()->handle_area(); | |
161 area->_no_handle_mark_nesting++; | |
162 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); | |
163 } | |
164 | |
165 | |
166 NoHandleMark::~NoHandleMark() { | |
167 HandleArea* area = Thread::current()->handle_area(); | |
168 assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" ); | |
169 area->_no_handle_mark_nesting--; | |
170 } | |
171 | |
172 | |
173 ResetNoHandleMark::ResetNoHandleMark() { | |
174 HandleArea* area = Thread::current()->handle_area(); | |
175 _no_handle_mark_nesting = area->_no_handle_mark_nesting; | |
176 area->_no_handle_mark_nesting = 0; | |
177 } | |
178 | |
179 | |
180 ResetNoHandleMark::~ResetNoHandleMark() { | |
181 HandleArea* area = Thread::current()->handle_area(); | |
182 area->_no_handle_mark_nesting = _no_handle_mark_nesting; | |
183 } | |
184 | |
185 #endif |