Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/code/StubQueue.java @ 18665:96861e3f8cc5
made CFGPrinterObserver reset (upon close) properly
author | Doug Simon <doug.simon@oracle.com> |
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date | Thu, 11 Dec 2014 22:14:30 +0100 |
parents | c18cbe5936b8 |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2002, 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
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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 package sun.jvm.hotspot.code; | |
26 | |
27 import java.util.*; | |
28 import sun.jvm.hotspot.debugger.*; | |
29 import sun.jvm.hotspot.runtime.*; | |
30 import sun.jvm.hotspot.types.*; | |
31 import sun.jvm.hotspot.utilities.*; | |
32 | |
33 /** <P> A port of the VM's StubQueue. Note that the VM implicitly | |
34 knows the type of the objects contained in each StubQueue because | |
35 it passes in an instance of a StubInterface to the StubQueue's | |
36 constructor; the goal in the VM was to save space in the generated | |
37 code. In the SA APIs the pattern has been to use the | |
38 VirtualConstructor mechanism to instantiate wrapper objects of the | |
39 appropriate type for objects down in the VM; see, for example, the | |
40 CodeCache, which identifies NMethods, RuntimeStubs, etc. </P> | |
41 | |
42 <P> In this port we eliminate the StubInterface in favor of | |
43 passing in the class corresponding to the type of Stub which this | |
44 StubQueue contains. </P> */ | |
45 | |
46 public class StubQueue extends VMObject { | |
47 // FIXME: add the rest of the fields | |
48 private static AddressField stubBufferField; | |
49 private static CIntegerField bufferLimitField; | |
50 private static CIntegerField queueBeginField; | |
51 private static CIntegerField queueEndField; | |
52 private static CIntegerField numberOfStubsField; | |
53 | |
54 // The type of the contained stubs (i.e., InterpreterCodelet, | |
55 // ICStub). Must be a subclass of type Stub. | |
56 private Class stubType; | |
57 | |
58 static { | |
59 VM.registerVMInitializedObserver(new Observer() { | |
60 public void update(Observable o, Object data) { | |
61 initialize(VM.getVM().getTypeDataBase()); | |
62 } | |
63 }); | |
64 } | |
65 | |
66 private static synchronized void initialize(TypeDataBase db) { | |
67 Type type = db.lookupType("StubQueue"); | |
68 | |
69 stubBufferField = type.getAddressField("_stub_buffer"); | |
70 bufferLimitField = type.getCIntegerField("_buffer_limit"); | |
71 queueBeginField = type.getCIntegerField("_queue_begin"); | |
72 queueEndField = type.getCIntegerField("_queue_end"); | |
73 numberOfStubsField = type.getCIntegerField("_number_of_stubs"); | |
74 } | |
75 | |
76 public StubQueue(Address addr, Class stubType) { | |
77 super(addr); | |
78 this.stubType = stubType; | |
79 } | |
80 | |
81 public boolean contains(Address pc) { | |
82 if (pc == null) return false; | |
83 long offset = pc.minus(getStubBuffer()); | |
84 return ((0 <= offset) && (offset < getBufferLimit())); | |
85 } | |
86 | |
87 public Stub getStubContaining(Address pc) { | |
88 if (contains(pc)) { | |
89 int i = 0; | |
90 for (Stub s = getFirst(); s != null; s = getNext(s)) { | |
91 if (stubContains(s, pc)) { | |
92 return s; | |
93 } | |
94 } | |
95 } | |
96 return null; | |
97 } | |
98 | |
99 public boolean stubContains(Stub s, Address pc) { | |
100 return (s.codeBegin().lessThanOrEqual(pc) && s.codeEnd().greaterThan(pc)); | |
101 } | |
102 | |
103 public int getNumberOfStubs() { | |
104 return (int) numberOfStubsField.getValue(addr); | |
105 } | |
106 | |
107 public Stub getFirst() { | |
108 return ((getNumberOfStubs() > 0) ? getStubAt(getQueueBegin()) : null); | |
109 } | |
110 | |
111 public Stub getNext(Stub s) { | |
112 long i = getIndexOf(s) + getStubSize(s); | |
113 if (i == getBufferLimit()) { | |
114 i = 0; | |
115 } | |
116 return ((i == getQueueEnd()) ? null : getStubAt(i)); | |
117 } | |
118 | |
119 public Stub getPrev(Stub s) { | |
120 if (getIndexOf(s) == getQueueBegin()) { | |
121 return null; | |
122 } | |
123 | |
124 Stub temp = getFirst(); | |
125 Stub prev = null; | |
126 while (temp != null && getIndexOf(temp) != getIndexOf(s)) { | |
127 prev = temp; | |
128 temp = getNext(temp); | |
129 } | |
130 | |
131 return prev; | |
132 } | |
133 | |
134 //-------------------------------------------------------------------------------- | |
135 // Internals only below this point | |
136 // | |
137 | |
138 private long getQueueBegin() { | |
139 return queueBeginField.getValue(addr); | |
140 } | |
141 | |
142 private long getQueueEnd() { | |
143 return queueEndField.getValue(addr); | |
144 } | |
145 | |
146 private long getBufferLimit() { | |
147 return bufferLimitField.getValue(addr); | |
148 } | |
149 | |
150 private Address getStubBuffer() { | |
151 return stubBufferField.getValue(addr); | |
152 } | |
153 | |
154 private Stub getStubAt(long offset) { | |
155 checkIndex(offset); | |
156 return (Stub) VMObjectFactory.newObject(stubType, getStubBuffer().addOffsetTo(offset)); | |
157 } | |
158 | |
159 private long getIndexOf(Stub s) { | |
160 long i = s.getAddress().minus(getStubBuffer()); | |
161 checkIndex(i); | |
162 return i; | |
163 } | |
164 | |
165 private long getStubSize(Stub s) { | |
166 return s.getSize(); | |
167 } | |
168 | |
169 private void checkIndex(long i) { | |
170 if (Assert.ASSERTS_ENABLED) { | |
171 Assert.that(0 <= i && i < getBufferLimit() && (i % VM.getVM().getAddressSize() == 0), "illegal index"); | |
172 } | |
173 } | |
174 } |