Mercurial > hg > truffle

annotate src/share/vm/memory/barrierSet.hpp @ 356:1ee8caae33af

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merge
author tonyp
date Thu, 21 Aug 2008 23:36:31 -0400
parents 37f87013dfd8 d1605aabd0a1
children df6caf649ff7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1 /*
196
d1605aabd0a1 6719955: Update copyright year
xdono
parents: 113
diff changeset
2 * Copyright 2000-2008 Sun Microsystems, Inc. All Rights Reserved.
0
a61af66fc99e Initial load
duke
parents:
diff changeset
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load
duke
parents:
diff changeset
4 *
a61af66fc99e Initial load
duke
parents:
diff changeset
5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load
duke
parents:
diff changeset
6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load
duke
parents:
diff changeset
7 * published by the Free Software Foundation.
a61af66fc99e Initial load
duke
parents:
diff changeset
8 *
a61af66fc99e Initial load
duke
parents:
diff changeset
9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load
duke
parents:
diff changeset
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load
duke
parents:
diff changeset
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load
duke
parents:
diff changeset
12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load
duke
parents:
diff changeset
13 * accompanied this code).
a61af66fc99e Initial load
duke
parents:
diff changeset
14 *
a61af66fc99e Initial load
duke
parents:
diff changeset
15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load
duke
parents:
diff changeset
16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load
duke
parents:
diff changeset
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load
duke
parents:
diff changeset
18 *
a61af66fc99e Initial load
duke
parents:
diff changeset
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
a61af66fc99e Initial load
duke
parents:
diff changeset
20 * CA 95054 USA or visit www.sun.com if you need additional information or
a61af66fc99e Initial load
duke
parents:
diff changeset
21 * have any questions.
a61af66fc99e Initial load
duke
parents:
diff changeset
22 *
a61af66fc99e Initial load
duke
parents:
diff changeset
23 */
a61af66fc99e Initial load
duke
parents:
diff changeset
24
a61af66fc99e Initial load
duke
parents:
diff changeset
25 // This class provides the interface between a barrier implementation and
a61af66fc99e Initial load
duke
parents:
diff changeset
26 // the rest of the system.
a61af66fc99e Initial load
duke
parents:
diff changeset
27
a61af66fc99e Initial load
duke
parents:
diff changeset
28 class BarrierSet: public CHeapObj {
a61af66fc99e Initial load
duke
parents:
diff changeset
29 friend class VMStructs;
a61af66fc99e Initial load
duke
parents:
diff changeset
30 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
31 enum Name {
a61af66fc99e Initial load
duke
parents:
diff changeset
32 ModRef,
a61af66fc99e Initial load
duke
parents:
diff changeset
33 CardTableModRef,
a61af66fc99e Initial load
duke
parents:
diff changeset
34 CardTableExtension,
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
35 G1SATBCT,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
36 G1SATBCTLogging,
0
a61af66fc99e Initial load
duke
parents:
diff changeset
37 Other,
a61af66fc99e Initial load
duke
parents:
diff changeset
38 Uninit
a61af66fc99e Initial load
duke
parents:
diff changeset
39 };
a61af66fc99e Initial load
duke
parents:
diff changeset
40
a61af66fc99e Initial load
duke
parents:
diff changeset
41 protected:
a61af66fc99e Initial load
duke
parents:
diff changeset
42 int _max_covered_regions;
a61af66fc99e Initial load
duke
parents:
diff changeset
43 Name _kind;
a61af66fc99e Initial load
duke
parents:
diff changeset
44
a61af66fc99e Initial load
duke
parents:
diff changeset
45 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
46
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
47 BarrierSet() { _kind = Uninit; }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
48 // To get around prohibition on RTTI.
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
49 BarrierSet::Name kind() { return _kind; }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
50 virtual bool is_a(BarrierSet::Name bsn) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
51
a61af66fc99e Initial load
duke
parents:
diff changeset
52 // These operations indicate what kind of barriers the BarrierSet has.
a61af66fc99e Initial load
duke
parents:
diff changeset
53 virtual bool has_read_ref_barrier() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
54 virtual bool has_read_prim_barrier() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
55 virtual bool has_write_ref_barrier() = 0;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
56 virtual bool has_write_ref_pre_barrier() = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
57 virtual bool has_write_prim_barrier() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
58
a61af66fc99e Initial load
duke
parents:
diff changeset
59 // These functions indicate whether a particular access of the given
a61af66fc99e Initial load
duke
parents:
diff changeset
60 // kinds requires a barrier.
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 0
diff changeset
61 virtual bool read_ref_needs_barrier(void* field) = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
62 virtual bool read_prim_needs_barrier(HeapWord* field, size_t bytes) = 0;
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 0
diff changeset
63 virtual bool write_ref_needs_barrier(void* field, oop new_val) = 0;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
64 virtual bool write_prim_needs_barrier(HeapWord* field, size_t bytes,
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
65 juint val1, juint val2) = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
66
a61af66fc99e Initial load
duke
parents:
diff changeset
67 // The first four operations provide a direct implementation of the
a61af66fc99e Initial load
duke
parents:
diff changeset
68 // barrier set. An interpreter loop, for example, could call these
a61af66fc99e Initial load
duke
parents:
diff changeset
69 // directly, as appropriate.
a61af66fc99e Initial load
duke
parents:
diff changeset
70
a61af66fc99e Initial load
duke
parents:
diff changeset
71 // Invoke the barrier, if any, necessary when reading the given ref field.
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 0
diff changeset
72 virtual void read_ref_field(void* field) = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
73
a61af66fc99e Initial load
duke
parents:
diff changeset
74 // Invoke the barrier, if any, necessary when reading the given primitive
a61af66fc99e Initial load
duke
parents:
diff changeset
75 // "field" of "bytes" bytes in "obj".
a61af66fc99e Initial load
duke
parents:
diff changeset
76 virtual void read_prim_field(HeapWord* field, size_t bytes) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
77
a61af66fc99e Initial load
duke
parents:
diff changeset
78 // Invoke the barrier, if any, necessary when writing "new_val" into the
a61af66fc99e Initial load
duke
parents:
diff changeset
79 // ref field at "offset" in "obj".
a61af66fc99e Initial load
duke
parents:
diff changeset
80 // (For efficiency reasons, this operation is specialized for certain
a61af66fc99e Initial load
duke
parents:
diff changeset
81 // barrier types. Semantically, it should be thought of as a call to the
a61af66fc99e Initial load
duke
parents:
diff changeset
82 // virtual "_work" function below, which must implement the barrier.)
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
83 // First the pre-write versions...
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
84 inline void write_ref_field_pre(void* field, oop new_val);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
85 protected:
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
86 virtual void write_ref_field_pre_work(void* field, oop new_val) {};
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
87 public:
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
88
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
89 // ...then the post-write version.
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 0
diff changeset
90 inline void write_ref_field(void* field, oop new_val);
0
a61af66fc99e Initial load
duke
parents:
diff changeset
91 protected:
113
ba764ed4b6f2 6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents: 0
diff changeset
92 virtual void write_ref_field_work(void* field, oop new_val) = 0;
0
a61af66fc99e Initial load
duke
parents:
diff changeset
93 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
94
a61af66fc99e Initial load
duke
parents:
diff changeset
95 // Invoke the barrier, if any, necessary when writing the "bytes"-byte
a61af66fc99e Initial load
duke
parents:
diff changeset
96 // value(s) "val1" (and "val2") into the primitive "field".
a61af66fc99e Initial load
duke
parents:
diff changeset
97 virtual void write_prim_field(HeapWord* field, size_t bytes,
a61af66fc99e Initial load
duke
parents:
diff changeset
98 juint val1, juint val2) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
99
a61af66fc99e Initial load
duke
parents:
diff changeset
100 // Operations on arrays, or general regions (e.g., for "clone") may be
a61af66fc99e Initial load
duke
parents:
diff changeset
101 // optimized by some barriers.
a61af66fc99e Initial load
duke
parents:
diff changeset
102
a61af66fc99e Initial load
duke
parents:
diff changeset
103 // The first six operations tell whether such an optimization exists for
a61af66fc99e Initial load
duke
parents:
diff changeset
104 // the particular barrier.
a61af66fc99e Initial load
duke
parents:
diff changeset
105 virtual bool has_read_ref_array_opt() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
106 virtual bool has_read_prim_array_opt() = 0;
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
107 virtual bool has_write_ref_array_pre_opt() { return true; }
0
a61af66fc99e Initial load
duke
parents:
diff changeset
108 virtual bool has_write_ref_array_opt() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
109 virtual bool has_write_prim_array_opt() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
110
a61af66fc99e Initial load
duke
parents:
diff changeset
111 virtual bool has_read_region_opt() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
112 virtual bool has_write_region_opt() = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
113
a61af66fc99e Initial load
duke
parents:
diff changeset
114 // These operations should assert false unless the correponding operation
a61af66fc99e Initial load
duke
parents:
diff changeset
115 // above returns true. Otherwise, they should perform an appropriate
a61af66fc99e Initial load
duke
parents:
diff changeset
116 // barrier for an array whose elements are all in the given memory region.
a61af66fc99e Initial load
duke
parents:
diff changeset
117 virtual void read_ref_array(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
118 virtual void read_prim_array(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
119
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
120 virtual void write_ref_array_pre(MemRegion mr) {}
0
a61af66fc99e Initial load
duke
parents:
diff changeset
121 inline void write_ref_array(MemRegion mr);
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
122
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
123 // Static versions, suitable for calling from generated code.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
124 static void static_write_ref_array_pre(HeapWord* start, size_t count);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
125 static void static_write_ref_array_post(HeapWord* start, size_t count);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 113
diff changeset
126
0
a61af66fc99e Initial load
duke
parents:
diff changeset
127 protected:
a61af66fc99e Initial load
duke
parents:
diff changeset
128 virtual void write_ref_array_work(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
129 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
130 virtual void write_prim_array(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
131
a61af66fc99e Initial load
duke
parents:
diff changeset
132 virtual void read_region(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
133
a61af66fc99e Initial load
duke
parents:
diff changeset
134 // (For efficiency reasons, this operation is specialized for certain
a61af66fc99e Initial load
duke
parents:
diff changeset
135 // barrier types. Semantically, it should be thought of as a call to the
a61af66fc99e Initial load
duke
parents:
diff changeset
136 // virtual "_work" function below, which must implement the barrier.)
a61af66fc99e Initial load
duke
parents:
diff changeset
137 inline void write_region(MemRegion mr);
a61af66fc99e Initial load
duke
parents:
diff changeset
138 protected:
a61af66fc99e Initial load
duke
parents:
diff changeset
139 virtual void write_region_work(MemRegion mr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
140 public:
a61af66fc99e Initial load
duke
parents:
diff changeset
141
a61af66fc99e Initial load
duke
parents:
diff changeset
142 // Some barrier sets create tables whose elements correspond to parts of
a61af66fc99e Initial load
duke
parents:
diff changeset
143 // the heap; the CardTableModRefBS is an example. Such barrier sets will
a61af66fc99e Initial load
duke
parents:
diff changeset
144 // normally reserve space for such tables, and commit parts of the table
a61af66fc99e Initial load
duke
parents:
diff changeset
145 // "covering" parts of the heap that are committed. The constructor is
a61af66fc99e Initial load
duke
parents:
diff changeset
146 // passed the maximum number of independently committable subregions to
a61af66fc99e Initial load
duke
parents:
diff changeset
147 // be covered, and the "resize_covoered_region" function allows the
a61af66fc99e Initial load
duke
parents:
diff changeset
148 // sub-parts of the heap to inform the barrier set of changes of their
a61af66fc99e Initial load
duke
parents:
diff changeset
149 // sizes.
a61af66fc99e Initial load
duke
parents:
diff changeset
150 BarrierSet(int max_covered_regions) :
a61af66fc99e Initial load
duke
parents:
diff changeset
151 _max_covered_regions(max_covered_regions) {}
a61af66fc99e Initial load
duke
parents:
diff changeset
152
a61af66fc99e Initial load
duke
parents:
diff changeset
153 // Inform the BarrierSet that the the covered heap region that starts
a61af66fc99e Initial load
duke
parents:
diff changeset
154 // with "base" has been changed to have the given size (possibly from 0,
a61af66fc99e Initial load
duke
parents:
diff changeset
155 // for initialization.)
a61af66fc99e Initial load
duke
parents:
diff changeset
156 virtual void resize_covered_region(MemRegion new_region) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
157
a61af66fc99e Initial load
duke
parents:
diff changeset
158 // If the barrier set imposes any alignment restrictions on boundaries
a61af66fc99e Initial load
duke
parents:
diff changeset
159 // within the heap, this function tells whether they are met.
a61af66fc99e Initial load
duke
parents:
diff changeset
160 virtual bool is_aligned(HeapWord* addr) = 0;
a61af66fc99e Initial load
duke
parents:
diff changeset
161
a61af66fc99e Initial load
duke
parents:
diff changeset
162 };