Mercurial > hg > truffle
annotate agent/src/share/classes/sun/jvm/hotspot/utilities/ReversePtrsAnalysis.java @ 13705:ac5b0f31f7a2
Truffle API-change: FrameDescriptors are now stored in the RootNode in a final field instead of the CallTarget.
author | Christian Humer <christian.humer@gmail.com> |
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date | Fri, 17 Jan 2014 17:06:08 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2002, 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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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.utilities; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.gc_interface.*; | |
31 import sun.jvm.hotspot.memory.*; | |
32 import sun.jvm.hotspot.oops.*; | |
33 import sun.jvm.hotspot.runtime.*; | |
34 import sun.jvm.hotspot.utilities.*; | |
35 | |
36 /** For a set of known roots, descends recursively into the object | |
37 graph, for each object recording those objects (and their fields) | |
38 which point to it. NOTE: currently only a subset of the roots | |
39 known to the VM is exposed to the SA: objects on the stack, static | |
40 fields in classes, and JNI handles. These should be most of the | |
41 user-level roots keeping objects alive. */ | |
42 | |
43 public class ReversePtrsAnalysis { | |
44 // Used for debugging this code | |
45 private static final boolean DEBUG = false; | |
46 | |
47 public ReversePtrsAnalysis() { | |
48 } | |
49 | |
50 /** Sets an optional progress thunk */ | |
51 public void setHeapProgressThunk(HeapProgressThunk thunk) { | |
52 progressThunk = thunk; | |
53 } | |
54 | |
55 | |
56 /** Runs the analysis algorithm */ | |
57 public void run() { | |
58 if (VM.getVM().getRevPtrs() != null) { | |
59 return; // Assume already done | |
60 } | |
61 | |
62 VM vm = VM.getVM(); | |
63 rp = new ReversePtrs(); | |
64 vm.setRevPtrs(rp); | |
65 Universe universe = vm.getUniverse(); | |
66 CollectedHeap collHeap = universe.heap(); | |
67 usedSize = collHeap.used(); | |
68 visitedSize = 0; | |
69 | |
70 // Note that an experiment to iterate the heap linearly rather | |
71 // than in recursive-descent order has been done. It turns out | |
72 // that the recursive-descent algorithm is nearly twice as fast | |
73 // due to the fact that it scans only live objects and (currently) | |
74 // only a fraction of the perm gen, namely the static fields | |
75 // contained in instanceKlasses. (Iterating the heap linearly | |
76 // would also change the semantics of the result so that | |
77 // ReversePtrs.get() would return a non-null value even for dead | |
78 // objects.) Nonetheless, the reverse pointer computation is still | |
79 // quite slow and optimization in field iteration of objects | |
80 // should be done. | |
81 | |
82 if (progressThunk != null) { | |
83 // Get it started | |
84 progressThunk.heapIterationFractionUpdate(0); | |
85 } | |
86 | |
87 // Allocate mark bits for heap | |
88 markBits = new MarkBits(collHeap); | |
89 | |
90 // Get a hold of the object heap | |
91 heap = vm.getObjectHeap(); | |
92 | |
93 // Do each thread's roots | |
94 for (JavaThread thread = VM.getVM().getThreads().first(); | |
95 thread != null; | |
96 thread = thread.next()) { | |
97 ByteArrayOutputStream bos = new ByteArrayOutputStream(); | |
98 thread.printThreadIDOn(new PrintStream(bos)); | |
99 String threadDesc = | |
100 " in thread \"" + thread.getThreadName() + | |
101 "\" (id " + bos.toString() + ")"; | |
102 doStack(thread, | |
103 new RootVisitor("Stack root" + threadDesc)); | |
104 doJNIHandleBlock(thread.activeHandles(), | |
105 new RootVisitor("JNI handle root" + threadDesc)); | |
106 } | |
107 | |
108 // Do global JNI handles | |
109 JNIHandles handles = VM.getVM().getJNIHandles(); | |
110 doJNIHandleBlock(handles.globalHandles(), | |
111 new RootVisitor("Global JNI handle root")); | |
112 doJNIHandleBlock(handles.weakGlobalHandles(), | |
113 new RootVisitor("Weak global JNI handle root")); | |
114 | |
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115 // Do Java-level static fields |
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116 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); |
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117 sysDict.allClassesDo(new SystemDictionary.ClassVisitor() { |
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118 |
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119 public void visit(Klass k) { |
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120 if (k instanceof InstanceKlass) { |
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121 final InstanceKlass ik = (InstanceKlass)k; |
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122 ik.iterateStaticFields( |
0 | 123 new DefaultOopVisitor() { |
124 public void doOop(OopField field, boolean isVMField) { | |
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125 Oop next = field.getValue(getObj()); |
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126 NamedFieldIdentifier nfi = new NamedFieldIdentifier("Static field \"" + |
0 | 127 field.getID().getName() + |
128 "\" in class \"" + | |
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129 ik.getName().asString() + "\""); |
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130 LivenessPathElement lp = new LivenessPathElement(null, nfi); |
0 | 131 rp.put(lp, next); |
132 try { | |
133 markAndTraverse(next); | |
134 } catch (AddressException e) { | |
135 System.err.print("RevPtrs analysis: WARNING: AddressException at 0x" + | |
136 Long.toHexString(e.getAddress()) + | |
137 " while traversing static fields of InstanceKlass "); | |
138 ik.printValueOn(System.err); | |
139 System.err.println(); | |
140 } catch (UnknownOopException e) { | |
141 System.err.println("RevPtrs analysis: WARNING: UnknownOopException while " + | |
142 "traversing static fields of InstanceKlass "); | |
143 ik.printValueOn(System.err); | |
144 System.err.println(); | |
145 } | |
146 } | |
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147 }); |
0 | 148 } |
149 } | |
150 }); | |
151 | |
152 if (progressThunk != null) { | |
153 progressThunk.heapIterationComplete(); | |
154 } | |
155 | |
156 // Clear out markBits | |
157 markBits = null; | |
158 } | |
159 | |
160 | |
161 //--------------------------------------------------------------------------- | |
162 // Internals only below this point | |
163 // | |
164 private HeapProgressThunk progressThunk; | |
165 private long usedSize; | |
166 private long visitedSize; | |
167 private double lastNotificationFraction; | |
168 private static final double MINIMUM_NOTIFICATION_FRACTION = 0.01; | |
169 private ObjectHeap heap; | |
170 private MarkBits markBits; | |
171 private int depth; // Debugging only | |
172 private ReversePtrs rp; | |
173 | |
174 private void markAndTraverse(OopHandle handle) { | |
175 try { | |
176 markAndTraverse(heap.newOop(handle)); | |
177 } catch (AddressException e) { | |
178 System.err.println("RevPtrs analysis: WARNING: AddressException at 0x" + | |
179 Long.toHexString(e.getAddress()) + | |
180 " while traversing oop at " + handle); | |
181 } catch (UnknownOopException e) { | |
182 System.err.println("RevPtrs analysis: WARNING: UnknownOopException for " + | |
183 "oop at " + handle); | |
184 } | |
185 } | |
186 | |
187 private void printHeader() { | |
188 for (int i = 0; i < depth; i++) { | |
189 System.err.print(" "); | |
190 } | |
191 } | |
192 | |
193 private void markAndTraverse(final Oop obj) { | |
194 | |
195 // End of path | |
196 if (obj == null) { | |
197 return; | |
198 } | |
199 | |
200 // Visited object | |
201 if (!markBits.mark(obj)) { | |
202 return; | |
203 } | |
204 | |
205 // Root of work list for objects to be visited. A simple | |
206 // stack for saving new objects to be analyzed. | |
207 | |
208 final Stack workList = new Stack(); | |
209 | |
210 // Next object to be visited. | |
211 Oop next = obj; | |
212 | |
213 try { | |
214 // Node in the list currently being visited. | |
215 | |
216 while (true) { | |
217 final Oop currObj = next; | |
218 | |
219 // For the progress meter | |
220 if (progressThunk != null) { | |
221 visitedSize += currObj.getObjectSize(); | |
222 double curFrac = (double) visitedSize / (double) usedSize; | |
223 if (curFrac > | |
224 lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) { | |
225 progressThunk.heapIterationFractionUpdate(curFrac); | |
226 lastNotificationFraction = curFrac; | |
227 } | |
228 } | |
229 | |
230 if (DEBUG) { | |
231 ++depth; | |
232 printHeader(); | |
233 System.err.println("ReversePtrs.markAndTraverse(" + | |
234 currObj.getHandle() + ")"); | |
235 } | |
236 | |
237 // Iterate over the references in the object. Do the | |
238 // reverse pointer analysis for each reference. | |
239 // Add the reference to the work-list so that its | |
240 // references will be visited. | |
241 currObj.iterate(new DefaultOopVisitor() { | |
242 public void doOop(OopField field, boolean isVMField) { | |
243 // "field" refers to a reference in currObj | |
244 Oop next = field.getValue(currObj); | |
245 rp.put(new LivenessPathElement(currObj, field.getID()), next); | |
246 if ((next != null) && markBits.mark(next)) { | |
247 workList.push(next); | |
248 } | |
249 } | |
250 }, false); | |
251 | |
252 if (DEBUG) { | |
253 --depth; | |
254 } | |
255 | |
256 // Get the next object to visit. | |
257 next = (Oop) workList.pop(); | |
258 } | |
259 } catch (EmptyStackException e) { | |
260 // Done | |
261 } catch (NullPointerException e) { | |
262 System.err.println("ReversePtrs: WARNING: " + e + | |
263 " during traversal"); | |
264 } catch (Exception e) { | |
265 System.err.println("ReversePtrs: WARNING: " + e + | |
266 " during traversal"); | |
267 } | |
268 } | |
269 | |
270 | |
271 class RootVisitor implements AddressVisitor { | |
272 RootVisitor(String baseRootDescription) { | |
273 this.baseRootDescription = baseRootDescription; | |
274 } | |
275 | |
276 public void visitAddress(Address addr) { | |
277 Oop next = heap.newOop(addr.getOopHandleAt(0)); | |
278 LivenessPathElement lp = new LivenessPathElement(null, | |
279 new NamedFieldIdentifier(baseRootDescription + | |
280 " @ " + addr)); | |
281 rp.put(lp, next); | |
282 markAndTraverse(next); | |
283 } | |
284 | |
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285 public void visitCompOopAddress(Address addr) { |
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286 Oop next = heap.newOop(addr.getCompOopHandleAt(0)); |
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287 LivenessPathElement lp = new LivenessPathElement(null, |
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288 new NamedFieldIdentifier(baseRootDescription + |
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289 " @ " + addr)); |
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290 rp.put(lp, next); |
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291 markAndTraverse(next); |
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292 } |
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293 |
0 | 294 private String baseRootDescription; |
295 } | |
296 | |
297 // Traverse the roots on a given thread's stack | |
298 private void doStack(JavaThread thread, AddressVisitor oopVisitor) { | |
299 for (StackFrameStream fst = new StackFrameStream(thread); !fst.isDone(); fst.next()) { | |
300 fst.getCurrent().oopsDo(oopVisitor, fst.getRegisterMap()); | |
301 } | |
302 } | |
303 | |
304 // Traverse a JNIHandleBlock | |
305 private void doJNIHandleBlock(JNIHandleBlock handles, AddressVisitor oopVisitor) { | |
306 handles.oopsDo(oopVisitor); | |
307 } | |
308 } |