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comparison agent/src/share/classes/sun/jvm/hotspot/compiler/OopMapSet.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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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.compiler; | |
26 | |
27 import java.util.*; | |
28 | |
29 import sun.jvm.hotspot.code.*; | |
30 import sun.jvm.hotspot.debugger.*; | |
31 import sun.jvm.hotspot.runtime.*; | |
32 import sun.jvm.hotspot.types.*; | |
33 import sun.jvm.hotspot.utilities.*; | |
34 | |
35 public class OopMapSet extends VMObject { | |
36 private static final boolean DEBUG = System.getProperty("sun.jvm.hotspot.compiler.OopMapSet.DEBUG") != null; | |
37 | |
38 private static CIntegerField omCountField; | |
39 private static CIntegerField omSizeField; | |
40 private static AddressField omDataField; | |
41 private static int REG_COUNT; | |
42 private static int SAVED_ON_ENTRY_REG_COUNT; | |
43 private static int C_SAVED_ON_ENTRY_REG_COUNT; | |
44 private static class MyVisitor implements OopMapVisitor { | |
45 private AddressVisitor addressVisitor; | |
46 | |
47 public MyVisitor(AddressVisitor oopVisitor) { | |
48 setAddressVisitor(oopVisitor); | |
49 } | |
50 | |
51 public void setAddressVisitor(AddressVisitor addressVisitor) { | |
52 this.addressVisitor = addressVisitor; | |
53 } | |
54 | |
55 public void visitOopLocation(Address oopAddr) { | |
56 addressVisitor.visitAddress(oopAddr); | |
57 } | |
58 | |
59 public void visitDerivedOopLocation(Address baseOopAddr, Address derivedOopAddr) { | |
60 if (VM.getVM().isClientCompiler()) { | |
61 Assert.that(false, "should not reach here"); | |
62 } else if (VM.getVM().isServerCompiler() && | |
63 VM.getVM().useDerivedPointerTable()) { | |
64 Assert.that(false, "FIXME: add derived pointer table"); | |
65 } | |
66 } | |
67 | |
68 public void visitValueLocation(Address valueAddr) { | |
69 } | |
70 | |
71 public void visitDeadLocation(Address deadAddr) { | |
72 } | |
73 } | |
74 | |
75 static { | |
76 VM.registerVMInitializedObserver(new Observer() { | |
77 public void update(Observable o, Object data) { | |
78 initialize(VM.getVM().getTypeDataBase()); | |
79 } | |
80 }); | |
81 } | |
82 | |
83 private static void initialize(TypeDataBase db) { | |
84 Type type = db.lookupType("OopMapSet"); | |
85 | |
86 omCountField = type.getCIntegerField("_om_count"); | |
87 omSizeField = type.getCIntegerField("_om_size"); | |
88 omDataField = type.getAddressField("_om_data"); | |
89 | |
90 if (!VM.getVM().isCore()) { | |
91 REG_COUNT = db.lookupIntConstant("REG_COUNT").intValue(); | |
92 if (VM.getVM().isServerCompiler()) { | |
93 SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("SAVED_ON_ENTRY_REG_COUNT").intValue(); | |
94 C_SAVED_ON_ENTRY_REG_COUNT = (int) db.lookupIntConstant("C_SAVED_ON_ENTRY_REG_COUNT").intValue(); | |
95 } | |
96 } | |
97 } | |
98 | |
99 public OopMapSet(Address addr) { | |
100 super(addr); | |
101 } | |
102 | |
103 /** Returns the number of OopMaps in this OopMapSet */ | |
104 public long getSize() { | |
105 return omCountField.getValue(addr); | |
106 } | |
107 | |
108 /** returns the OopMap at a given index */ | |
109 public OopMap getMapAt(int index) { | |
110 if (Assert.ASSERTS_ENABLED) { | |
111 Assert.that((index >= 0) && (index <= getSize()),"bad index"); | |
112 } | |
113 Address omDataAddr = omDataField.getValue(addr); | |
114 Address oopMapAddr = omDataAddr.getAddressAt(index * VM.getVM().getAddressSize()); | |
115 if (oopMapAddr == null) { | |
116 return null; | |
117 } | |
118 return new OopMap(oopMapAddr); | |
119 } | |
120 | |
121 public OopMap findMapAtOffset(long pcOffset, boolean debugging) { | |
122 int i; | |
123 int len = (int) getSize(); | |
124 if (Assert.ASSERTS_ENABLED) { | |
125 Assert.that(len > 0, "must have pointer maps"); | |
126 } | |
127 | |
128 // Scan through oopmaps. Stop when current offset is either equal or greater | |
129 // than the one we are looking for. | |
130 for (i = 0; i < len; i++) { | |
131 if (getMapAt(i).getOffset() >= pcOffset) { | |
132 break; | |
133 } | |
134 } | |
135 | |
136 if (!debugging) { | |
137 if (Assert.ASSERTS_ENABLED) { | |
138 Assert.that(i < len, "oopmap not found for pcOffset = " + pcOffset + "; len = " + len); | |
139 Assert.that(getMapAt(i).getOffset() == pcOffset, "oopmap not found"); | |
140 } | |
141 } else { | |
142 if (i == len) { | |
143 if (DEBUG) { | |
144 System.out.println("can't find oopmap at " + pcOffset); | |
145 System.out.print("Oopmap offsets are [ "); | |
146 for (i = 0; i < len; i++) { | |
147 System.out.print(getMapAt(i).getOffset()); | |
148 } | |
149 System.out.println("]"); | |
150 } | |
151 i = len - 1; | |
152 return getMapAt(i); | |
153 } | |
154 } | |
155 | |
156 OopMap m = getMapAt(i); | |
157 return m; | |
158 } | |
159 | |
160 /** Visitation -- iterates through the frame for a compiled method. | |
161 This is a very generic mechanism that requires the Address to be | |
162 dereferenced by the callee. Other, more specialized, visitation | |
163 mechanisms are given below. */ | |
164 public static void oopsDo(Frame fr, CodeBlob cb, RegisterMap regMap, AddressVisitor oopVisitor, boolean debugging) { | |
165 allDo(fr, cb, regMap, new MyVisitor(oopVisitor), debugging); | |
166 } | |
167 | |
168 /** Note that there are 4 required AddressVisitors: one for oops, | |
169 one for derived oops, one for values, and one for dead values */ | |
170 public static void allDo(Frame fr, CodeBlob cb, RegisterMap regMap, OopMapVisitor visitor, boolean debugging) { | |
171 if (Assert.ASSERTS_ENABLED) { | |
172 CodeBlob tmpCB = VM.getVM().getCodeCache().findBlob(fr.getPC()); | |
173 Assert.that(tmpCB != null && cb.equals(tmpCB), "wrong codeblob passed in"); | |
174 } | |
175 | |
176 OopMapSet maps = cb.getOopMaps(); | |
177 OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); | |
178 if (Assert.ASSERTS_ENABLED) { | |
179 Assert.that(map != null, "no ptr map found"); | |
180 } | |
181 | |
182 // handle derived pointers first (otherwise base pointer may be | |
183 // changed before derived pointer offset has been collected) | |
184 OopMapValue omv; | |
185 { | |
186 for (OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.DERIVED_OOP_VALUE); !oms.isDone(); oms.next()) { | |
187 if (VM.getVM().isClientCompiler()) { | |
188 Assert.that(false, "should not reach here"); | |
189 } | |
190 omv = oms.getCurrent(); | |
191 Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); | |
192 if (loc != null) { | |
193 Address baseLoc = fr.oopMapRegToLocation(omv.getContentReg(), regMap); | |
194 Address derivedLoc = loc; | |
195 visitor.visitDerivedOopLocation(baseLoc, derivedLoc); | |
196 } | |
197 } | |
198 } | |
199 | |
200 // We want dead, value and oop oop_types | |
201 OopMapValue.OopTypes[] values = new OopMapValue.OopTypes[] { | |
202 OopMapValue.OopTypes.OOP_VALUE, OopMapValue.OopTypes.VALUE_VALUE, OopMapValue.OopTypes.DEAD_VALUE | |
203 }; | |
204 | |
205 { | |
206 for (OopMapStream oms = new OopMapStream(map, values); !oms.isDone(); oms.next()) { | |
207 omv = oms.getCurrent(); | |
208 Address loc = fr.oopMapRegToLocation(omv.getReg(), regMap); | |
209 if (loc != null) { | |
210 if (omv.getType() == OopMapValue.OopTypes.OOP_VALUE) { | |
211 // This assert commented out because this will be useful | |
212 // to detect in the debugging system | |
213 // assert(Universe::is_heap_or_null(*loc), "found non oop pointer"); | |
214 visitor.visitOopLocation(loc); | |
215 } else if (omv.getType() == OopMapValue.OopTypes.VALUE_VALUE) { | |
216 visitor.visitValueLocation(loc); | |
217 } else if (omv.getType() == OopMapValue.OopTypes.DEAD_VALUE) { | |
218 visitor.visitDeadLocation(loc); | |
219 } | |
220 } | |
221 } | |
222 } | |
223 } | |
224 | |
225 /** Update callee-saved register info for the following frame. | |
226 Should only be called in non-core builds. */ | |
227 public static void updateRegisterMap(Frame fr, CodeBlob cb, RegisterMap regMap, boolean debugging) { | |
228 if (Assert.ASSERTS_ENABLED) { | |
229 Assert.that(!VM.getVM().isCore(), "non-core builds only"); | |
230 } | |
231 | |
232 if (!VM.getVM().isDebugging()) { | |
233 if (Assert.ASSERTS_ENABLED) { | |
234 OopMapSet maps = cb.getOopMaps(); | |
235 Assert.that((maps != null) && (maps.getSize() > 0), "found null or empty OopMapSet for CodeBlob"); | |
236 } | |
237 } else { | |
238 // Hack for some topmost frames that have been found with empty | |
239 // OopMapSets. (Actually have not seen the null case, but don't | |
240 // want to take any chances.) See HSDB.showThreadStackMemory(). | |
241 OopMapSet maps = cb.getOopMaps(); | |
242 if ((maps == null) || (maps.getSize() == 0)) { | |
243 return; | |
244 } | |
245 } | |
246 | |
247 // Check if caller must update oop argument | |
248 regMap.setIncludeArgumentOops(cb.callerMustGCArguments(regMap.getThread())); | |
249 | |
250 int nofCallee = 0; | |
251 Address[] locs = new Address[2 * REG_COUNT + 1]; | |
252 VMReg [] regs = new VMReg [2 * REG_COUNT + 1]; | |
253 // ("+1" because REG_COUNT might be zero) | |
254 | |
255 // Scan through oopmap and find location of all callee-saved registers | |
256 // (we do not do update in place, since info could be overwritten) | |
257 OopMap map = cb.getOopMapForReturnAddress(fr.getPC(), debugging); | |
258 if (Assert.ASSERTS_ENABLED) { | |
259 Assert.that(map != null, "no ptr map found"); | |
260 } | |
261 | |
262 OopMapValue omv = null; | |
263 for(OopMapStream oms = new OopMapStream(map, OopMapValue.OopTypes.CALLEE_SAVED_VALUE); !oms.isDone(); oms.next()) { | |
264 omv = oms.getCurrent(); | |
265 if (Assert.ASSERTS_ENABLED) { | |
266 Assert.that(nofCallee < 2 * REG_COUNT, "overflow"); | |
267 } | |
268 regs[nofCallee] = omv.getContentReg(); | |
269 locs[nofCallee] = fr.oopMapRegToLocation(omv.getReg(), regMap); | |
270 nofCallee++; | |
271 } | |
272 | |
273 // Check that runtime stubs save all callee-saved registers | |
274 // After adapter frames were deleted C2 doesn't use callee save registers at present | |
275 if (Assert.ASSERTS_ENABLED) { | |
276 if (VM.getVM().isServerCompiler()) { | |
277 Assert.that(!cb.isRuntimeStub() || | |
278 (nofCallee >= SAVED_ON_ENTRY_REG_COUNT || nofCallee >= C_SAVED_ON_ENTRY_REG_COUNT), | |
279 "must save all"); | |
280 } | |
281 } | |
282 | |
283 // Copy found callee-saved register to reg_map | |
284 for (int i = 0; i < nofCallee; i++) { | |
285 regMap.setLocation(regs[i], locs[i]); | |
286 } | |
287 } | |
288 } |