1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* Copyright (c) 1997, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
# include "incls/_precompiled.incl"
# include "incls/_handles.cpp.incl"
#ifdef ASSERT
oop* HandleArea::allocate_handle(oop obj) {
assert(_handle_mark_nesting > 1, "memory leak: allocating handle outside HandleMark");
assert(_no_handle_mark_nesting == 0, "allocating handle inside NoHandleMark");
assert(SharedSkipVerify || obj->is_oop(), "sanity check");
return real_allocate_handle(obj);
}
Handle::Handle(Thread* thread, oop obj) {
assert(thread == Thread::current(), "sanity check");
if (obj == NULL) {
_handle = NULL;
} else {
_handle = thread->handle_area()->allocate_handle(obj);
}
}
#endif
static uintx chunk_oops_do(OopClosure* f, Chunk* chunk, char* chunk_top) {
oop* bottom = (oop*) chunk->bottom();
oop* top = (oop*) chunk_top;
uintx handles_visited = top - bottom;
assert(top >= bottom && top <= (oop*) chunk->top(), "just checking");
// during GC phase 3, a handle may be a forward pointer that
// is not yet valid, so loosen the assertion
while (bottom < top) {
// assert((*bottom)->is_oop(), "handle should point to oop");
assert(Universe::heap()->is_in(*bottom), "handle should be valid heap address");
f->do_oop(bottom++);
}
return handles_visited;
}
// Used for debugging handle allocation.
NOT_PRODUCT(jint _nof_handlemarks = 0;)
void HandleArea::oops_do(OopClosure* f) {
uintx handles_visited = 0;
// First handle the current chunk. It is filled to the high water mark.
handles_visited += chunk_oops_do(f, _chunk, _hwm);
// Then handle all previous chunks. They are completely filled.
Chunk* k = _first;
while(k != _chunk) {
handles_visited += chunk_oops_do(f, k, k->top());
k = k->next();
}
// The thread local handle areas should not get very large
if (TraceHandleAllocation && handles_visited > TotalHandleAllocationLimit) {
#ifdef ASSERT
warning("%d: Visited in HandleMark : %d",
_nof_handlemarks, handles_visited);
#else
warning("Visited in HandleMark : %d", handles_visited);
#endif
}
if (_prev != NULL) _prev->oops_do(f);
}
void HandleMark::initialize(Thread* thread) {
_thread = thread;
// Save area
_area = thread->handle_area();
// Save current top
_chunk = _area->_chunk;
_hwm = _area->_hwm;
_max = _area->_max;
NOT_PRODUCT(_size_in_bytes = _area->_size_in_bytes;)
debug_only(_area->_handle_mark_nesting++);
assert(_area->_handle_mark_nesting > 0, "must stack allocate HandleMarks");
debug_only(Atomic::inc(&_nof_handlemarks);)
// Link this in the thread
set_previous_handle_mark(thread->last_handle_mark());
thread->set_last_handle_mark(this);
}
HandleMark::~HandleMark() {
HandleArea* area = _area; // help compilers with poor alias analysis
assert(area == _thread->handle_area(), "sanity check");
assert(area->_handle_mark_nesting > 0, "must stack allocate HandleMarks" );
debug_only(area->_handle_mark_nesting--);
// Debug code to trace the number of handles allocated per mark/
#ifdef ASSERT
if (TraceHandleAllocation) {
size_t handles = 0;
Chunk *c = _chunk->next();
if (c == NULL) {
handles = area->_hwm - _hwm; // no new chunk allocated
} else {
handles = _max - _hwm; // add rest in first chunk
while(c != NULL) {
handles += c->length();
c = c->next();
}
handles -= area->_max - area->_hwm; // adjust for last trunk not full
}
handles /= sizeof(void *); // Adjust for size of a handle
if (handles > HandleAllocationLimit) {
// Note: _nof_handlemarks is only set in debug mode
warning("%d: Allocated in HandleMark : %d", _nof_handlemarks, handles);
}
}
#endif
// Delete later chunks
if( _chunk->next() ) {
_chunk->next_chop();
}
// Roll back arena to saved top markers
area->_chunk = _chunk;
area->_hwm = _hwm;
area->_max = _max;
NOT_PRODUCT(area->set_size_in_bytes(_size_in_bytes);)
#ifdef ASSERT
// clear out first chunk (to detect allocation bugs)
if (ZapVMHandleArea) {
memset(_hwm, badHandleValue, _max - _hwm);
}
Atomic::dec(&_nof_handlemarks);
#endif
// Unlink this from the thread
_thread->set_last_handle_mark(previous_handle_mark());
}
#ifdef ASSERT
NoHandleMark::NoHandleMark() {
HandleArea* area = Thread::current()->handle_area();
area->_no_handle_mark_nesting++;
assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
}
NoHandleMark::~NoHandleMark() {
HandleArea* area = Thread::current()->handle_area();
assert(area->_no_handle_mark_nesting > 0, "must stack allocate NoHandleMark" );
area->_no_handle_mark_nesting--;
}
ResetNoHandleMark::ResetNoHandleMark() {
HandleArea* area = Thread::current()->handle_area();
_no_handle_mark_nesting = area->_no_handle_mark_nesting;
area->_no_handle_mark_nesting = 0;
}
ResetNoHandleMark::~ResetNoHandleMark() {
HandleArea* area = Thread::current()->handle_area();
area->_no_handle_mark_nesting = _no_handle_mark_nesting;
}
#endif
|
