Mercurial > hg > truffle
annotate src/share/vm/code/scopeDesc.hpp @ 20543:e7d0505c8a30
8059758: Footprint regressions with JDK-8038423
Summary: Changes in JDK-8038423 always initialize (zero out) virtual memory used for auxiliary data structures. This causes a footprint regression for G1 in startup benchmarks. This is because they do not touch that memory at all, so the operating system does not actually commit these pages. The fix is to, if the initialization value of the data structures matches the default value of just committed memory (=0), do not do anything.
Reviewed-by: jwilhelm, brutisso
author | tschatzl |
---|---|
date | Fri, 10 Oct 2014 15:51:58 +0200 |
parents | da91efe96a93 |
children | e522a00b91aa 933c8a58c9dc |
rev | line source |
---|---|
0 | 1 /* |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
2 * Copyright (c) 1997, 2012, 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
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1253
diff
changeset
|
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1253
diff
changeset
|
20 * or visit www.oracle.com if you need additional information or have any |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
trims
parents:
1253
diff
changeset
|
21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_CODE_SCOPEDESC_HPP |
26 #define SHARE_VM_CODE_SCOPEDESC_HPP | |
27 | |
28 #include "code/debugInfo.hpp" | |
29 #include "code/pcDesc.hpp" | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
30 #include "oops/method.hpp" |
1972 | 31 #include "utilities/growableArray.hpp" |
32 | |
0 | 33 // SimpleScopeDesc is used when all you need to extract from |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
34 // a given pc,nmethod pair is a Method* and a bci. This is |
0 | 35 // quite a bit faster than allocating a full ScopeDesc, but |
36 // very limited in abilities. | |
37 | |
38 class SimpleScopeDesc : public StackObj { | |
39 private: | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
40 Method* _method; |
0 | 41 int _bci; |
42 | |
43 public: | |
44 SimpleScopeDesc(nmethod* code,address pc) { | |
45 PcDesc* pc_desc = code->pc_desc_at(pc); | |
46 assert(pc_desc != NULL, "Must be able to find matching PcDesc"); | |
47 DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset()); | |
48 int ignore_sender = buffer.read_int(); | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
49 _method = buffer.read_method(); |
931
72088be4b386
6873116: Modify reexecute implementation to use pcDesc to record the reexecute bit
cfang
parents:
900
diff
changeset
|
50 _bci = buffer.read_bci(); |
0 | 51 } |
52 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
53 Method* method() { return _method; } |
0 | 54 int bci() { return _bci; } |
55 }; | |
56 | |
57 // ScopeDescs contain the information that makes source-level debugging of | |
58 // nmethods possible; each scopeDesc describes a method activation | |
59 | |
60 class ScopeDesc : public ResourceObj { | |
61 public: | |
62 // Constructor | |
1253
f70b0d9ab095
6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")
kvn
parents:
931
diff
changeset
|
63 ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset, bool reexecute, bool return_oop); |
0 | 64 |
65 // Calls above, giving default value of "serialized_null" to the | |
66 // "obj_decode_offset" argument. (We don't use a default argument to | |
67 // avoid a .hpp-.hpp dependency.) | |
1253
f70b0d9ab095
6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")
kvn
parents:
931
diff
changeset
|
68 ScopeDesc(const nmethod* code, int decode_offset, bool reexecute, bool return_oop); |
0 | 69 |
70 // JVM state | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
71 Method* method() const { return _method; } |
900
9987d9d5eb0e
6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
cfang
parents:
0
diff
changeset
|
72 int bci() const { return _bci; } |
9987d9d5eb0e
6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
cfang
parents:
0
diff
changeset
|
73 bool should_reexecute() const { return _reexecute; } |
1253
f70b0d9ab095
6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")
kvn
parents:
931
diff
changeset
|
74 bool return_oop() const { return _return_oop; } |
0 | 75 |
76 GrowableArray<ScopeValue*>* locals(); | |
77 GrowableArray<ScopeValue*>* expressions(); | |
78 GrowableArray<MonitorValue*>* monitors(); | |
79 GrowableArray<ScopeValue*>* objects(); | |
80 | |
81 // Stack walking, returns NULL if this is the outer most scope. | |
82 ScopeDesc* sender() const; | |
83 | |
84 // Returns where the scope was decoded | |
85 int decode_offset() const { return _decode_offset; } | |
86 | |
87 // Tells whether sender() returns NULL | |
88 bool is_top() const; | |
89 // Tells whether sd is equal to this | |
90 bool is_equal(ScopeDesc* sd) const; | |
91 | |
92 private: | |
93 // Alternative constructor | |
94 ScopeDesc(const ScopeDesc* parent); | |
95 | |
96 // JVM state | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
1972
diff
changeset
|
97 Method* _method; |
0 | 98 int _bci; |
900
9987d9d5eb0e
6833129: specjvm98 fails with NullPointerException in the compiler with -XX:DeoptimizeALot
cfang
parents:
0
diff
changeset
|
99 bool _reexecute; |
1253
f70b0d9ab095
6910618: C2: Error: assert(d->is_oop(),"JVM_ArrayCopy: dst not an oop")
kvn
parents:
931
diff
changeset
|
100 bool _return_oop; |
0 | 101 |
102 // Decoding offsets | |
103 int _decode_offset; | |
104 int _sender_decode_offset; | |
105 int _locals_decode_offset; | |
106 int _expressions_decode_offset; | |
107 int _monitors_decode_offset; | |
108 | |
109 // Object pool | |
110 GrowableArray<ScopeValue*>* _objects; | |
111 | |
112 // Nmethod information | |
113 const nmethod* _code; | |
114 | |
115 // Decoding operations | |
116 void decode_body(); | |
117 GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset); | |
118 GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset); | |
119 GrowableArray<ScopeValue*>* decode_object_values(int decode_offset); | |
120 | |
121 DebugInfoReadStream* stream_at(int decode_offset) const; | |
122 | |
123 | |
124 public: | |
125 // Verification | |
126 void verify(); | |
127 | |
128 #ifndef PRODUCT | |
129 public: | |
130 // Printing support | |
131 void print_on(outputStream* st) const; | |
132 void print_on(outputStream* st, PcDesc* pd) const; | |
133 void print_value_on(outputStream* st) const; | |
134 #endif | |
135 }; | |
1972 | 136 |
137 #endif // SHARE_VM_CODE_SCOPEDESC_HPP |