1 /*
2 * Copyright (c) 2000, 2012, 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.oops;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // A MethodData provides interpreter profiling information
35
36 public class MethodData extends Metadata {
37 static int TypeProfileWidth = 2;
38 static int BciProfileWidth = 2;
39 static int CompileThreshold;
40
41 static int Reason_many; // indicates presence of several reasons
42 static int Reason_none; // indicates absence of a relevant deopt.
43 static int Reason_LIMIT;
44 static int Reason_RECORDED_LIMIT; // some are not recorded per bc
45
46 private static String[] trapReasonName;
47
48 static String trapReasonName(int reason) {
49 if (reason == Reason_many) return "many";
50 if (reason < Reason_LIMIT)
51 return trapReasonName[reason];
52 return "reason" + reason;
53 }
54
55
56 static int trapStateReason(int trapState) {
57 // This assert provides the link between the width of DataLayout.trapBits
58 // and the encoding of "recorded" reasons. It ensures there are enough
59 // bits to store all needed reasons in the per-BCI MDO profile.
60 // assert(dsReasonMask >= reasonRecordedLimit, "enough bits");
61 int recompileBit = (trapState & dsRecompileBit);
62 trapState -= recompileBit;
63 if (trapState == dsReasonMask) {
64 return Reason_many;
65 } else {
66 // assert((int)reasonNone == 0, "state=0 => Reason_none");
67 return trapState;
68 }
69 }
70
71
72 static final int dsReasonMask = DataLayout.trapMask >> 1;
73 static final int dsRecompileBit = DataLayout.trapMask - dsReasonMask;
74
75 static boolean trapStateIsRecompiled(int trapState) {
76 return (trapState & dsRecompileBit) != 0;
77 }
78
79 static boolean reasonIsRecordedPerBytecode(int reason) {
80 return reason > Reason_none && reason < Reason_RECORDED_LIMIT;
81 }
82 static int trapStateAddReason(int trapState, int reason) {
83 // assert(reasonIsRecordedPerBytecode((DeoptReason)reason) || reason == reasonMany, "valid reason");
84 int recompileBit = (trapState & dsRecompileBit);
85 trapState -= recompileBit;
86 if (trapState == dsReasonMask) {
87 return trapState + recompileBit; // already at state lattice bottom
88 } else if (trapState == reason) {
89 return trapState + recompileBit; // the condition is already true
90 } else if (trapState == 0) {
91 return reason + recompileBit; // no condition has yet been true
92 } else {
93 return dsReasonMask + recompileBit; // fall to state lattice bottom
94 }
95 }
96 static int trapStateSetRecompiled(int trapState, boolean z) {
97 if (z) return trapState | dsRecompileBit;
98 else return trapState & ~dsRecompileBit;
99 }
100
101 static String formatTrapState(int trapState) {
102 int reason = trapStateReason(trapState);
103 boolean recompFlag = trapStateIsRecompiled(trapState);
104 // Re-encode the state from its decoded components.
105 int decodedState = 0;
106 if (reasonIsRecordedPerBytecode(reason) || reason == Reason_many)
107 decodedState = trapStateAddReason(decodedState, reason);
108 if (recompFlag)
109 decodedState = trapStateSetRecompiled(decodedState, recompFlag);
110 // If the state re-encodes properly, format it symbolically.
111 // Because this routine is used for debugging and diagnostics,
112 // be robust even if the state is a strange value.
113 if (decodedState != trapState) {
114 // Random buggy state that doesn't decode??
115 return "#" + trapState;
116 } else {
117 return trapReasonName(reason) + (recompFlag ? " recompiled" : "");
118 }
119 }
120
121
122
123 static {
124 VM.registerVMInitializedObserver(new Observer() {
125 public void update(Observable o, Object data) {
126 initialize(VM.getVM().getTypeDataBase());
127 }
128 });
129 }
130
131 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
132 Type type = db.lookupType("MethodData");
133 baseOffset = type.getSize();
134
135 size = new CIntField(type.getCIntegerField("_size"), 0);
136 method = new MetadataField(type.getAddressField("_method"), 0);
137
138 VM.Flag[] flags = VM.getVM().getCommandLineFlags();
139 for (int f = 0; f < flags.length; f++) {
140 VM.Flag flag = flags[f];
141 if (flag.getName().equals("TypeProfileWidth")) {
142 TypeProfileWidth = (int)flag.getIntx();
143 } else if (flag.getName().equals("BciProfileWidth")) {
144 BciProfileWidth = (int)flag.getIntx();
145 } else if (flag.getName().equals("CompileThreshold")) {
146 CompileThreshold = (int)flag.getIntx();
147 }
148 }
149
150 cellSize = (int)VM.getVM().getAddressSize();
151
152 dataSize = new CIntField(type.getCIntegerField("_data_size"), 0);
153 data = type.getAddressField("_data[0]");
154
155 sizeofMethodDataOopDesc = (int)type.getSize();;
156
157 Reason_many = db.lookupIntConstant("Deoptimization::Reason_many").intValue();
158 Reason_none = db.lookupIntConstant("Deoptimization::Reason_none").intValue();
159 Reason_LIMIT = db.lookupIntConstant("Deoptimization::Reason_LIMIT").intValue();
160 Reason_RECORDED_LIMIT = db.lookupIntConstant("Deoptimization::Reason_RECORDED_LIMIT").intValue();
161
162 trapReasonName = new String[Reason_LIMIT];
163
164 // Find Deopt reasons
165 Iterator i = db.getIntConstants();
166 String prefix = "Deoptimization::Reason_";
167 while (i.hasNext()) {
168 String name = (String)i.next();
169 if (name.startsWith(prefix)) {
170 // Strip prefix
171 if (!name.endsWith("Reason_many") &&
172 !name.endsWith("Reason_LIMIT") &&
173 !name.endsWith("Reason_RECORDED_LIMIT")) {
174 String trimmed = name.substring(prefix.length());
175 int value = db.lookupIntConstant(name).intValue();
176 if (trapReasonName[value] != null) {
177 throw new InternalError("duplicate reasons: " + trapReasonName[value] + " " + trimmed);
178 }
179 trapReasonName[value] = trimmed;
180 }
181 }
182 }
183 for (int index = 0; index < trapReasonName.length; index++) {
184 if (trapReasonName[index] == null) {
185 throw new InternalError("missing reason for " + index);
186 }
187 }
188 }
189
190 public MethodData(Address addr) {
191 super(addr);
192 }
193
194 public boolean isMethodData() { return true; }
195
196 private static long baseOffset;
197 private static CIntField size;
198 private static MetadataField method;
199 private static CIntField dataSize;
200 private static AddressField data;
201
202 public static int sizeofMethodDataOopDesc;
203 public static int cellSize;
204
205 public Method getMethod() {
206 return (Method) method.getValue(this);
207 }
208
209 public void printValueOn(PrintStream tty) {
210 Method m = getMethod();
211 tty.print("MethodData for " + m.getName().asString() + m.getSignature().asString());
212 }
213
214 public void iterateFields(MetadataVisitor visitor) {
215 super.iterateFields(visitor);
216 visitor.doMetadata(method, true);
217 visitor.doCInt(size, true);
218 }
219
220 int dataSize() {
221 if (dataSize == null) {
222 return 0;
223 } else {
224 return (int)dataSize.getValue(getAddress());
225 }
226 }
227
228 boolean outOfBounds(int dataIndex) {
229 return dataIndex >= dataSize();
230 }
231
232 ProfileData dataAt(int dataIndex) {
233 if (outOfBounds(dataIndex)) {
234 return null;
235 }
236 DataLayout dataLayout = new DataLayout(this, dataIndex + (int)data.getOffset());
237
238 switch (dataLayout.tag()) {
239 case DataLayout.noTag:
240 default:
241 throw new InternalError(dataIndex + " " + dataSize() + " " + dataLayout.tag());
242 case DataLayout.bitDataTag:
243 return new BitData(dataLayout);
244 case DataLayout.counterDataTag:
245 return new CounterData(dataLayout);
246 case DataLayout.jumpDataTag:
247 return new JumpData(dataLayout);
248 case DataLayout.receiverTypeDataTag:
249 return new ReceiverTypeData(dataLayout);
250 case DataLayout.virtualCallDataTag:
251 return new VirtualCallData(dataLayout);
252 case DataLayout.retDataTag:
253 return new RetData(dataLayout);
254 case DataLayout.branchDataTag:
255 return new BranchData(dataLayout);
256 case DataLayout.multiBranchDataTag:
257 return new MultiBranchData(dataLayout);
258 }
259 }
260
261 int dpToDi(int dp) {
262 // this in an offset from the base of the MDO, so convert to offset into _data
263 return dp - (int)data.getOffset();
264 }
265
266 int firstDi() { return 0; }
267 public ProfileData firstData() { return dataAt(firstDi()); }
268 public ProfileData nextData(ProfileData current) {
269 int currentIndex = dpToDi(current.dp());
270 int nextIndex = currentIndex + current.sizeInBytes();
271 return dataAt(nextIndex);
272 }
273 boolean isValid(ProfileData current) { return current != null; }
274
275 public void printDataOn(PrintStream st) {
276 ProfileData data = firstData();
277 for ( ; isValid(data); data = nextData(data)) {
278 st.print(dpToDi(data.dp()));
279 st.print(" ");
280 // st->fillTo(6);
281 data.printDataOn(st);
282 }
283 }
284
285 private byte[] fetchDataAt(Address base, long offset, long size) {
286 byte[] result = new byte[(int)size];
287 for (int i = 0; i < size; i++) {
288 result[i] = base.getJByteAt(offset + i);
289 }
290 return result;
291 }
292
293 public byte[] orig() {
294 // fetch the orig MethodData data between header and dataSize
295 return fetchDataAt(getAddress(), 0, sizeofMethodDataOopDesc);
296 }
297
298 public long[] data() {
299 // Read the data as an array of intptr_t elements
300 Address base = getAddress();
301 long offset = data.getOffset();
302 int elements = dataSize() / cellSize;
303 long[] result = new long[elements];
304 for (int i = 0; i < elements; i++) {
305 Address value = base.getAddressAt(offset + i * MethodData.cellSize);
306 if (value != null) {
307 result[i] = value.minus(null);
308 }
309 }
310 return result;
311 }
312
313 // Get a measure of how much mileage the method has on it.
314 int mileageOf(Method method) {
315 long mileage = 0;
316 int iic = method.interpreterInvocationCount();
317 if (mileage < iic) mileage = iic;
318
319 long ic = method.getInvocationCounter();
320 long bc = method.getBackedgeCounter();
321
322 long icval = ic >> 3;
323 if ((ic & 4) != 0) icval += CompileThreshold;
324 if (mileage < icval) mileage = icval;
325 long bcval = bc >> 3;
326 if ((bc & 4) != 0) bcval += CompileThreshold;
327 if (mileage < bcval) mileage = bcval;
328 return (int)mileage;
329 }
330
331 public int currentMileage() {
332 return 20000;
333 }
334
335 public void dumpReplayData(PrintStream out) {
336 Method method = getMethod();
337 Klass holder = method.getMethodHolder();
338 out.print("ciMethodData " +
339 holder.getName().asString() + " " +
340 OopUtilities.escapeString(method.getName().asString()) + " " +
341 method.getSignature().asString() + " " +
342 "2" + " " +
343 currentMileage());
344 byte[] orig = orig();
345 out.print(" orig " + orig.length);
346 for (int i = 0; i < orig.length; i++) {
347 out.print(" " + (orig[i] & 0xff));
348 }
349
350 long[] data = data();
351 out.print(" data " + data.length);
352 for (int i = 0; i < data.length; i++) {
353 out.print(" 0x" + Long.toHexString(data[i]));
354 }
355 int count = 0;
356 for (int round = 0; round < 2; round++) {
357 if (round == 1) out.print(" oops " + count);
358 ProfileData pdata = firstData();
359 for ( ; isValid(pdata); pdata = nextData(pdata)) {
360 if (pdata instanceof ReceiverTypeData) {
361 ReceiverTypeData vdata = (ReceiverTypeData)pdata;
362 for (int i = 0; i < vdata.rowLimit(); i++) {
363 Klass k = vdata.receiver(i);
364 if (k != null) {
365 if (round == 0) count++;
366 else out.print(" " +
367 (dpToDi(vdata.dp() +
368 vdata.cellOffset(vdata.receiverCellIndex(i))) / cellSize) + " " +
369 k.getName().asString());
370 }
371 }
372 } else if (pdata instanceof VirtualCallData) {
373 VirtualCallData vdata = (VirtualCallData)pdata;
374 for (int i = 0; i < vdata.rowLimit(); i++) {
375 Klass k = vdata.receiver(i);
376 if (k != null) {
377 if (round == 0) count++;
378 else out.print(" " +
379 (dpToDi(vdata.dp() +
380 vdata.cellOffset(vdata.receiverCellIndex(i))) / cellSize) + " " +
381 k.getName().asString());
382 }
383 }
384 }
385 }
386 }
387 out.println();
388 }
389 }