1 /*
2 * Copyright (c) 2000, 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 GrowableArray<CodeHeap> heapArray;
36 private static AddressField scavengeRootNMethodsField;
37 private static VirtualConstructor virtualConstructor;
38
39 static {
40 VM.registerVMInitializedObserver(new Observer() {
41 public void update(Observable o, Object data) {
42 initialize(VM.getVM().getTypeDataBase());
43 }
44 });
45 }
46
47 private static synchronized void initialize(TypeDataBase db) {
48 Type type = db.lookupType("CodeCache");
49
50 // Get array of CodeHeaps
51 // Note: CodeHeap may be subclassed with optional private heap mechanisms.
52 Type codeHeapType = db.lookupType("CodeHeap");
53 VirtualBaseConstructor heapConstructor =
54 new VirtualBaseConstructor(db, codeHeapType, "sun.jvm.hotspot.memory", CodeHeap.class);
55
56 AddressField heapsField = type.getAddressField("_heaps");
57 heapArray = GrowableArray.create(heapsField.getValue(), heapConstructor);
58
59 scavengeRootNMethodsField = type.getAddressField("_scavenge_root_nmethods");
60
61 virtualConstructor = new VirtualConstructor(db);
62 // Add mappings for all possible CodeBlob subclasses
63 virtualConstructor.addMapping("BufferBlob", BufferBlob.class);
64 virtualConstructor.addMapping("nmethod", NMethod.class);
65 virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class);
66 virtualConstructor.addMapping("AdapterBlob", AdapterBlob.class);
67 virtualConstructor.addMapping("MethodHandlesAdapterBlob", MethodHandlesAdapterBlob.class);
68 virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class);
69 virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class);
70 if (VM.getVM().isServerCompiler()) {
71 virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class);
72 virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class);
73 }
74 }
75
76 public NMethod scavengeRootMethods() {
77 return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootNMethodsField.getValue());
78 }
79
80 public boolean contains(Address p) {
81 for (int i = 0; i < heapArray.length(); ++i) {
82 if (heapArray.at(i).contains(p)) {
83 return true;
84 }
85 }
86 return false;
87 }
88
89 /** When VM.getVM().isDebugging() returns true, this behaves like
90 findBlobUnsafe */
91 public CodeBlob findBlob(Address start) {
92 CodeBlob result = findBlobUnsafe(start);
93 if (result == null) return null;
94 if (VM.getVM().isDebugging()) {
95 return result;
96 }
97 // We could potientially look up non_entrant methods
98 // NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM
99 if (Assert.ASSERTS_ENABLED) {
100 Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method");
101 }
102 return result;
103 }
104
105 public CodeBlob findBlobUnsafe(Address start) {
106 CodeBlob result = null;
107 CodeHeap containing_heap = null;
108 for (int i = 0; i < heapArray.length(); ++i) {
109 if (heapArray.at(i).contains(start)) {
110 containing_heap = heapArray.at(i);
111 break;
112 }
113 }
114 if (containing_heap == null) {
115 return null;
116 }
117
118 try {
119 result = (CodeBlob) virtualConstructor.instantiateWrapperFor(containing_heap.findStart(start));
120 }
121 catch (WrongTypeException wte) {
122 Address cbAddr = null;
123 try {
124 cbAddr = containing_heap.findStart(start);
125 }
126 catch (Exception findEx) {
127 findEx.printStackTrace();
128 }
129
130 String message = "Couldn't deduce type of CodeBlob ";
131 if (cbAddr != null) {
132 message = message + "@" + cbAddr + " ";
133 }
134 message = message + "for PC=" + start;
135
136 throw new RuntimeException(message, wte);
137 }
138 if (result == null) return null;
139 if (Assert.ASSERTS_ENABLED) {
140 // The HeapBlock that contains this blob is outside of the blob
141 // but it shouldn't be an error to find a blob based on the
142 // pointer to the HeapBlock.
143 Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)),
144 "found wrong CodeBlob");
145 }
146 return result;
147 }
148
149 public NMethod findNMethod(Address start) {
150 CodeBlob cb = findBlob(start);
151 if (Assert.ASSERTS_ENABLED) {
152 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
153 }
154 return (NMethod) cb;
155 }
156
157 public NMethod findNMethodUnsafe(Address start) {
158 CodeBlob cb = findBlobUnsafe(start);
159 if (Assert.ASSERTS_ENABLED) {
160 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
161 }
162 return (NMethod) cb;
163 }
164
165 /** Routine for instantiating appropriately-typed wrapper for a
166 CodeBlob. Used by CodeCache, Runtime1, etc. */
167 public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) {
168 try {
169 return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr);
170 }
171 catch (Exception e) {
172 String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr +
173 " (expected type nmethod, RuntimeStub, ";
174 if (VM.getVM().isClientCompiler()) {
175 message = message + " or ";
176 }
177 message = message + "SafepointBlob";
178 if (VM.getVM().isServerCompiler()) {
179 message = message + ", DeoptimizationBlob, or ExceptionBlob";
180 }
181 message = message + ")";
182 throw new RuntimeException(message);
183 }
184 }
185
186 public void iterate(CodeCacheVisitor visitor) {
187 visitor.prologue(lowBound(), highBound());
188 for (int i = 0; i < heapArray.length(); ++i) {
189 CodeHeap current_heap = heapArray.at(i);
190 current_heap.iterate(visitor, this);
191 }
192 visitor.epilogue();
193 }
194
195 //--------------------------------------------------------------------------------
196 // Internals only below this point
197 //
198
199 private Address lowBound() {
200 Address low = heapArray.at(0).begin();
201 for (int i = 1; i < heapArray.length(); ++i) {
202 if (heapArray.at(i).begin().lessThan(low)) {
203 low = heapArray.at(i).begin();
204 }
205 }
206 return low;
207 }
208
209 private Address highBound() {
210 Address high = heapArray.at(0).end();
211 for (int i = 1; i < heapArray.length(); ++i) {
212 if (heapArray.at(i).end().greaterThan(high)) {
213 high = heapArray.at(i).end();
214 }
215 }
216 return high;
217 }
218 }