1 /*
2 * Copyright (c) 2000, 2019, 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 VirtualConstructor virtualConstructor;
37
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) {
47 Type type = db.lookupType("CodeCache");
48
49 // Get array of CodeHeaps
50 // Note: CodeHeap may be subclassed with optional private heap mechanisms.
51 Type codeHeapType = db.lookupType("CodeHeap");
52 VirtualBaseConstructor heapConstructor =
53 new VirtualBaseConstructor(db, codeHeapType, "sun.jvm.hotspot.memory", CodeHeap.class);
54
55 AddressField heapsField = type.getAddressField("_heaps");
56 heapArray = GrowableArray.create(heapsField.getValue(), heapConstructor);
57
58 virtualConstructor = new VirtualConstructor(db);
59 // Add mappings for all possible CodeBlob subclasses
60 virtualConstructor.addMapping("BufferBlob", BufferBlob.class);
61 virtualConstructor.addMapping("nmethod", NMethod.class);
62 virtualConstructor.addMapping("RuntimeStub", RuntimeStub.class);
63 virtualConstructor.addMapping("AdapterBlob", AdapterBlob.class);
64 virtualConstructor.addMapping("MethodHandlesAdapterBlob", MethodHandlesAdapterBlob.class);
65 virtualConstructor.addMapping("SafepointBlob", SafepointBlob.class);
66 virtualConstructor.addMapping("DeoptimizationBlob", DeoptimizationBlob.class);
67 if (VM.getVM().isServerCompiler()) {
68 virtualConstructor.addMapping("ExceptionBlob", ExceptionBlob.class);
69 virtualConstructor.addMapping("UncommonTrapBlob", UncommonTrapBlob.class);
70 }
71 }
72
73 public boolean contains(Address p) {
74 for (int i = 0; i < heapArray.length(); ++i) {
75 if (heapArray.at(i).contains(p)) {
76 return true;
77 }
78 }
79 return false;
80 }
81
82 /** When VM.getVM().isDebugging() returns true, this behaves like
83 findBlobUnsafe */
84 public CodeBlob findBlob(Address start) {
85 CodeBlob result = findBlobUnsafe(start);
86 if (result == null) return null;
87 if (VM.getVM().isDebugging()) {
88 return result;
89 }
90 // We could potientially look up non_entrant methods
91 // NOTE: this is effectively a "guarantee", and is slightly different from the one in the VM
92 if (Assert.ASSERTS_ENABLED) {
93 Assert.that(!(result.isZombie() || result.isLockedByVM()), "unsafe access to zombie method");
94 }
95 return result;
96 }
97
98 public CodeBlob findBlobUnsafe(Address start) {
99 CodeBlob result = null;
100 CodeHeap containing_heap = null;
101 for (int i = 0; i < heapArray.length(); ++i) {
102 if (heapArray.at(i).contains(start)) {
103 containing_heap = heapArray.at(i);
104 break;
105 }
106 }
107 if (containing_heap == null) {
108 return null;
109 }
110
111 try {
112 result = (CodeBlob) virtualConstructor.instantiateWrapperFor(containing_heap.findStart(start));
113 }
114 catch (WrongTypeException wte) {
115 Address cbAddr = null;
116 try {
117 cbAddr = containing_heap.findStart(start);
118 }
119 catch (Exception findEx) {
120 findEx.printStackTrace();
121 }
122
123 String message = "Couldn't deduce type of CodeBlob ";
124 if (cbAddr != null) {
125 message = message + "@" + cbAddr + " ";
126 }
127 message = message + "for PC=" + start;
128
129 throw new RuntimeException(message, wte);
130 }
131 if (result == null) return null;
132 if (Assert.ASSERTS_ENABLED) {
133 // The HeapBlock that contains this blob is outside of the blob
134 // but it shouldn't be an error to find a blob based on the
135 // pointer to the HeapBlock.
136 Assert.that(result.blobContains(start) || result.blobContains(start.addOffsetTo(8)),
137 "found wrong CodeBlob");
138 }
139 return result;
140 }
141
142 public NMethod findNMethod(Address start) {
143 CodeBlob cb = findBlob(start);
144 if (Assert.ASSERTS_ENABLED) {
145 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
146 }
147 return (NMethod) cb;
148 }
149
150 public NMethod findNMethodUnsafe(Address start) {
151 CodeBlob cb = findBlobUnsafe(start);
152 if (Assert.ASSERTS_ENABLED) {
153 Assert.that(cb == null || cb.isNMethod(), "did not find an nmethod");
154 }
155 return (NMethod) cb;
156 }
157
158 /** Routine for instantiating appropriately-typed wrapper for a
159 CodeBlob. Used by CodeCache, Runtime1, etc. */
160 public CodeBlob createCodeBlobWrapper(Address codeBlobAddr) {
161 try {
162 return (CodeBlob) virtualConstructor.instantiateWrapperFor(codeBlobAddr);
163 }
164 catch (Exception e) {
165 String message = "Unable to deduce type of CodeBlob from address " + codeBlobAddr +
166 " (expected type nmethod, RuntimeStub, ";
167 if (VM.getVM().isClientCompiler()) {
168 message = message + " or ";
169 }
170 message = message + "SafepointBlob";
171 if (VM.getVM().isServerCompiler()) {
172 message = message + ", DeoptimizationBlob, or ExceptionBlob";
173 }
174 message = message + ")";
175 throw new RuntimeException(message);
176 }
177 }
178
179 public void iterate(CodeCacheVisitor visitor) {
180 visitor.prologue(lowBound(), highBound());
181 for (int i = 0; i < heapArray.length(); ++i) {
182 CodeHeap current_heap = heapArray.at(i);
183 current_heap.iterate(visitor, this);
184 }
185 visitor.epilogue();
186 }
187
188 //--------------------------------------------------------------------------------
189 // Internals only below this point
190 //
191
192 private Address lowBound() {
193 Address low = heapArray.at(0).begin();
194 for (int i = 1; i < heapArray.length(); ++i) {
195 if (heapArray.at(i).begin().lessThan(low)) {
196 low = heapArray.at(i).begin();
197 }
198 }
199 return low;
200 }
201
202 private Address highBound() {
203 Address high = heapArray.at(0).end();
204 for (int i = 1; i < heapArray.length(); ++i) {
205 if (heapArray.at(i).end().greaterThan(high)) {
206 high = heapArray.at(i).end();
207 }
208 }
209 return high;
210 }
211 }