Mercurial > hg > truffle
comparison agent/src/share/classes/sun/jvm/hotspot/code/CodeCache.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | 148e5441d916 |
comparison
equal
deleted
inserted
replaced
-1:000000000000 | 0:a61af66fc99e |
---|---|
1 /* | |
2 * Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
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.memory.*; | |
30 import sun.jvm.hotspot.runtime.*; | |
31 import sun.jvm.hotspot.types.*; | |
32 import sun.jvm.hotspot.utilities.*; | |
33 | |
34 public class CodeCache { | |
35 private static AddressField heapField; | |
36 private static VirtualConstructor virtualConstructor; | |
37 | |
38 private CodeHeap heap; | |
39 | |
40 static { | |
41 VM.registerVMInitializedObserver(new Observer() { | |
42 public void update(Observable o, Object data) { | |
43 initialize(VM.getVM().getTypeDataBase()); | |
44 } | |
45 }); | |
46 } | |
47 | |
48 private static synchronized void initialize(TypeDataBase db) { | |
49 Type type = db.lookupType("CodeCache"); | |
50 | |
51 heapField = type.getAddressField("_heap"); | |
52 | |
53 virtualConstructor = new VirtualConstructor(db); | |
54 // Add mappings for all possible CodeBlob subclasses | |
55 virtualConstructor.addMapping("BufferBlob", BufferBlob.class); | |
56 virtualConstructor.addMapping("nmethod", NMethod.class); | |
57 virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class); | |
58 virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class); | |
59 virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class); | |
60 if (VM.getVM().isServerCompiler()) { | |
61 virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class); | |
62 virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class); | |
63 } | |
64 } | |
65 | |
66 public CodeCache() { | |
67 heap = (CodeHeap) VMObjectFactory.newObject(CodeHeap.class, heapField.getValue()); | |
68 } | |
69 | |
70 public boolean contains(Address p) { | |
71 return getHeap().contains(p); | |
72 } | |
73 | |
74 /** When VM.getVM().isDebugging() returns true, this behaves like | |
75 findBlobUnsafe */ | |
76 public CodeBlob findBlob(Address start) { | |
77 CodeBlob result = findBlobUnsafe(start); | |
78 if (result == null) return null; | |
79 if (VM.getVM().isDebugging()) { | |
80 return result; | |
81 } | |
82 // We could potientially look up non_entrant methods | |
83 // NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM | |
84 if (Assert.ASSERTS_ENABLED) { | |
85 Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method"); | |
86 } | |
87 return result; | |
88 } | |
89 | |
90 public CodeBlob findBlobUnsafe(Address start) { | |
91 CodeBlob result = null; | |
92 | |
93 try { | |
94 result = (CodeBlob) virtualConstructor.instantiateWrapperFor(getHeap().findStart(start)); | |
95 } | |
96 catch (WrongTypeException wte) { | |
97 Address cbAddr = null; | |
98 try { | |
99 cbAddr = getHeap().findStart(start); | |
100 } | |
101 catch (Exception findEx) { | |
102 findEx.printStackTrace(); | |
103 } | |
104 | |
105 String message = "Couldn't deduce type of CodeBlob "; | |
106 if (cbAddr != null) { | |
107 message = message + "@" + cbAddr + " "; | |
108 } | |
109 message = message + "for PC=" + start; | |
110 | |
111 throw new RuntimeException(message, wte); | |
112 } | |
113 if (result == null) return null; | |
114 if (Assert.ASSERTS_ENABLED) { | |
115 // The HeapBlock that contains this blob is outside of the blob | |
116 // but it shouldn't be an error to find a blob based on the | |
117 // pointer to the HeapBlock. | |
118 Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)), | |
119 "found wrong CodeBlob"); | |
120 } | |
121 return result; | |
122 } | |
123 | |
124 public NMethod findNMethod(Address start) { | |
125 CodeBlob cb = findBlob(start); | |
126 if (Assert.ASSERTS_ENABLED) { | |
127 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod"); | |
128 } | |
129 return (NMethod) cb; | |
130 } | |
131 | |
132 public NMethod findNMethodUnsafe(Address start) { | |
133 CodeBlob cb = findBlobUnsafe(start); | |
134 if (Assert.ASSERTS_ENABLED) { | |
135 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod"); | |
136 } | |
137 return (NMethod) cb; | |
138 } | |
139 | |
140 /** Routine for instantiating appropriately-typed wrapper for a | |
141 CodeBlob. Used by CodeCache, Runtime1, etc. */ | |
142 public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) { | |
143 try { | |
144 return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr); | |
145 } | |
146 catch (Exception e) { | |
147 String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr + | |
148 " (expected type nmethod, RuntimeStub, "; | |
149 if (VM.getVM().isClientCompiler()) { | |
150 message = message + " or "; | |
151 } | |
152 message = message + "SafepointBlob"; | |
153 if (VM.getVM().isServerCompiler()) { | |
154 message = message + ", DeoptimizationBlob, or ExceptionBlob"; | |
155 } | |
156 message = message + ")"; | |
157 throw new RuntimeException(message); | |
158 } | |
159 } | |
160 | |
161 public void iterate(CodeCacheVisitor visitor) { | |
162 CodeHeap heap = getHeap(); | |
163 Address ptr = heap.begin(); | |
164 Address end = heap.end(); | |
165 | |
166 visitor.prologue(ptr, end); | |
167 CodeBlob lastBlob = null; | |
168 while (ptr != null && ptr.lessThan(end)) { | |
169 try { | |
170 CodeBlob blob = findBlobUnsafe(ptr); | |
171 if (blob != null) { | |
172 visitor.visit(blob); | |
173 if (blob == lastBlob) { | |
174 throw new InternalError("saw same blob twice"); | |
175 } | |
176 lastBlob = blob; | |
177 } | |
178 } catch (RuntimeException e) { | |
179 e.printStackTrace(); | |
180 } | |
181 Address next = heap.nextBlock(ptr); | |
182 if (next != null && next.lessThan(ptr)) { | |
183 throw new InternalError("pointer moved backwards"); | |
184 } | |
185 ptr = next; | |
186 } | |
187 visitor.epilogue(); | |
188 } | |
189 | |
190 //-------------------------------------------------------------------------------- | |
191 // Internals only below this point | |
192 // | |
193 | |
194 private CodeHeap getHeap() { | |
195 return heap; | |
196 } | |
197 } |