Mercurial > hg > graal-jvmci-8
comparison agent/src/share/classes/sun/jvm/hotspot/code/NMethod.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 | 72088be4b386 |
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1 /* | |
2 * Copyright 2000-2006 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.code; | |
26 | |
27 import java.io.*; | |
28 import java.util.*; | |
29 import sun.jvm.hotspot.debugger.*; | |
30 import sun.jvm.hotspot.memory.*; | |
31 import sun.jvm.hotspot.oops.*; | |
32 import sun.jvm.hotspot.runtime.*; | |
33 import sun.jvm.hotspot.types.*; | |
34 import sun.jvm.hotspot.utilities.*; | |
35 | |
36 public class NMethod extends CodeBlob { | |
37 private static long pcDescSize; | |
38 private static CIntegerField zombieInstructionSizeField; | |
39 private static sun.jvm.hotspot.types.OopField methodField; | |
40 /** != InvocationEntryBci if this nmethod is an on-stack replacement method */ | |
41 private static CIntegerField entryBCIField; | |
42 /** To support simple linked-list chaining of nmethods */ | |
43 private static AddressField linkField; | |
44 /** Offsets for different nmethod parts */ | |
45 private static CIntegerField exceptionOffsetField; | |
46 private static CIntegerField deoptOffsetField; | |
47 private static CIntegerField origPCOffsetField; | |
48 private static CIntegerField stubOffsetField; | |
49 private static CIntegerField scopesDataOffsetField; | |
50 private static CIntegerField scopesPCsOffsetField; | |
51 private static CIntegerField dependenciesOffsetField; | |
52 private static CIntegerField handlerTableOffsetField; | |
53 private static CIntegerField nulChkTableOffsetField; | |
54 private static CIntegerField nmethodEndOffsetField; | |
55 | |
56 /** Offsets for entry points */ | |
57 /** Entry point with class check */ | |
58 private static AddressField entryPointField; | |
59 /** Entry point without class check */ | |
60 private static AddressField verifiedEntryPointField; | |
61 /** Entry point for on stack replacement */ | |
62 private static AddressField osrEntryPointField; | |
63 | |
64 // FIXME: add access to flags (how?) | |
65 | |
66 /** NMethod Flushing lock (if non-zero, then the nmethod is not removed) */ | |
67 private static JIntField lockCountField; | |
68 | |
69 /** not_entrant method removal. Each mark_sweep pass will update | |
70 this mark to current sweep invocation count if it is seen on the | |
71 stack. An not_entrant method can be removed when there is no | |
72 more activations, i.e., when the _stack_traversal_mark is less than | |
73 current sweep traversal index. */ | |
74 private static CIntegerField stackTraversalMarkField; | |
75 | |
76 static { | |
77 VM.registerVMInitializedObserver(new Observer() { | |
78 public void update(Observable o, Object data) { | |
79 initialize(VM.getVM().getTypeDataBase()); | |
80 } | |
81 }); | |
82 } | |
83 | |
84 private static void initialize(TypeDataBase db) { | |
85 Type type = db.lookupType("nmethod"); | |
86 | |
87 zombieInstructionSizeField = type.getCIntegerField("_zombie_instruction_size"); | |
88 methodField = type.getOopField("_method"); | |
89 entryBCIField = type.getCIntegerField("_entry_bci"); | |
90 linkField = type.getAddressField("_link"); | |
91 exceptionOffsetField = type.getCIntegerField("_exception_offset"); | |
92 deoptOffsetField = type.getCIntegerField("_deoptimize_offset"); | |
93 origPCOffsetField = type.getCIntegerField("_orig_pc_offset"); | |
94 stubOffsetField = type.getCIntegerField("_stub_offset"); | |
95 scopesDataOffsetField = type.getCIntegerField("_scopes_data_offset"); | |
96 scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset"); | |
97 dependenciesOffsetField = type.getCIntegerField("_dependencies_offset"); | |
98 handlerTableOffsetField = type.getCIntegerField("_handler_table_offset"); | |
99 nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset"); | |
100 nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset"); | |
101 entryPointField = type.getAddressField("_entry_point"); | |
102 verifiedEntryPointField = type.getAddressField("_verified_entry_point"); | |
103 osrEntryPointField = type.getAddressField("_osr_entry_point"); | |
104 lockCountField = type.getJIntField("_lock_count"); | |
105 stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark"); | |
106 | |
107 pcDescSize = db.lookupType("PcDesc").getSize(); | |
108 } | |
109 | |
110 public NMethod(Address addr) { | |
111 super(addr); | |
112 } | |
113 | |
114 | |
115 // Accessors | |
116 public Address getAddress() { | |
117 return addr; | |
118 } | |
119 | |
120 public Method getMethod() { | |
121 return (Method) VM.getVM().getObjectHeap().newOop(methodField.getValue(addr)); | |
122 } | |
123 | |
124 // Type info | |
125 public boolean isNMethod() { return true; } | |
126 public boolean isJavaMethod() { return !getMethod().isNative(); } | |
127 public boolean isNativeMethod() { return getMethod().isNative(); } | |
128 public boolean isOSRMethod() { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); } | |
129 | |
130 /** Boundaries for different parts */ | |
131 public Address constantsBegin() { return instructionsBegin(); } | |
132 public Address constantsEnd() { return getEntryPoint(); } | |
133 public Address codeBegin() { return getEntryPoint(); } | |
134 public Address codeEnd() { return headerBegin().addOffsetTo(getStubOffset()); } | |
135 public Address exceptionBegin() { return headerBegin().addOffsetTo(getExceptionOffset()); } | |
136 public Address deoptBegin() { return headerBegin().addOffsetTo(getDeoptOffset()); } | |
137 public Address stubBegin() { return headerBegin().addOffsetTo(getStubOffset()); } | |
138 public Address stubEnd() { return headerBegin().addOffsetTo(getScopesDataOffset()); } | |
139 public Address scopesDataBegin() { return headerBegin().addOffsetTo(getScopesDataOffset()); } | |
140 public Address scopesDataEnd() { return headerBegin().addOffsetTo(getScopesPCsOffset()); } | |
141 public Address scopesPCsBegin() { return headerBegin().addOffsetTo(getScopesPCsOffset()); } | |
142 public Address scopesPCsEnd() { return headerBegin().addOffsetTo(getDependenciesOffset()); } | |
143 public Address dependenciesBegin() { return headerBegin().addOffsetTo(getDependenciesOffset()); } | |
144 public Address dependenciesEnd() { return headerBegin().addOffsetTo(getHandlerTableOffset()); } | |
145 public Address handlerTableBegin() { return headerBegin().addOffsetTo(getHandlerTableOffset()); } | |
146 public Address handlerTableEnd() { return headerBegin().addOffsetTo(getNulChkTableOffset()); } | |
147 public Address nulChkTableBegin() { return headerBegin().addOffsetTo(getNulChkTableOffset()); } | |
148 public Address nulChkTableEnd() { return headerBegin().addOffsetTo(getNMethodEndOffset()); } | |
149 | |
150 public int constantsSize() { return (int) constantsEnd() .minus(constantsBegin()); } | |
151 public int codeSize() { return (int) codeEnd() .minus(codeBegin()); } | |
152 public int stubSize() { return (int) stubEnd() .minus(stubBegin()); } | |
153 public int scopesDataSize() { return (int) scopesDataEnd() .minus(scopesDataBegin()); } | |
154 public int scopesPCsSize() { return (int) scopesPCsEnd() .minus(scopesPCsBegin()); } | |
155 public int dependenciesSize() { return (int) dependenciesEnd().minus(dependenciesBegin()); } | |
156 public int handlerTableSize() { return (int) handlerTableEnd().minus(handlerTableBegin()); } | |
157 public int nulChkTableSize() { return (int) nulChkTableEnd() .minus(nulChkTableBegin()); } | |
158 public int origPCOffset() { return (int) origPCOffsetField.getValue(addr); } | |
159 | |
160 public int totalSize() { | |
161 return | |
162 constantsSize() + | |
163 codeSize() + | |
164 stubSize() + | |
165 scopesDataSize() + | |
166 scopesPCsSize() + | |
167 dependenciesSize() + | |
168 handlerTableSize() + | |
169 nulChkTableSize(); | |
170 } | |
171 | |
172 public boolean constantsContains (Address addr) { return constantsBegin() .lessThanOrEqual(addr) && constantsEnd() .greaterThan(addr); } | |
173 public boolean codeContains (Address addr) { return codeBegin() .lessThanOrEqual(addr) && codeEnd() .greaterThan(addr); } | |
174 public boolean stubContains (Address addr) { return stubBegin() .lessThanOrEqual(addr) && stubEnd() .greaterThan(addr); } | |
175 public boolean scopesDataContains (Address addr) { return scopesDataBegin() .lessThanOrEqual(addr) && scopesDataEnd() .greaterThan(addr); } | |
176 public boolean scopesPCsContains (Address addr) { return scopesPCsBegin() .lessThanOrEqual(addr) && scopesPCsEnd() .greaterThan(addr); } | |
177 public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); } | |
178 public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); } | |
179 | |
180 /** Entry points */ | |
181 public Address getEntryPoint() { return entryPointField.getValue(addr); } | |
182 public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); } | |
183 | |
184 // FIXME: add interpreter_entry_point() | |
185 // FIXME: add lazy_interpreter_entry_point() for C2 | |
186 | |
187 // ********** | |
188 // * FIXME: * ADD ACCESS TO FLAGS!!!! | |
189 // ********** | |
190 // public boolean isInUse(); | |
191 // public boolean isAlive(); | |
192 // public boolean isNotEntrant(); | |
193 // public boolean isZombie(); | |
194 | |
195 // ******************************** | |
196 // * MAJOR FIXME: MAJOR HACK HERE * | |
197 // ******************************** | |
198 public boolean isZombie() { return false; } | |
199 | |
200 // public boolean isUnloaded(); | |
201 // public boolean isYoung(); | |
202 // public boolean isOld(); | |
203 // public int age(); | |
204 // public boolean isMarkedForDeoptimization(); | |
205 // public boolean isMarkedForUnloading(); | |
206 // public boolean isMarkedForReclamation(); | |
207 // public int level(); | |
208 // public int version(); | |
209 | |
210 // FIXME: add mutators for above | |
211 // FIXME: add exception cache access? | |
212 | |
213 /** On-stack replacement support */ | |
214 // FIXME: add mutators | |
215 public int getOSREntryBCI() { | |
216 if (Assert.ASSERTS_ENABLED) { | |
217 Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod"); | |
218 } | |
219 return getEntryBCI(); | |
220 } | |
221 | |
222 public NMethod getLink() { | |
223 return (NMethod) VMObjectFactory.newObject(NMethod.class, linkField.getValue(addr)); | |
224 } | |
225 | |
226 /** Tells whether frames described by this nmethod can be | |
227 deoptimized. Note: native wrappers cannot be deoptimized. */ | |
228 public boolean canBeDeoptimized() { return isJavaMethod(); } | |
229 | |
230 // FIXME: add inline cache support | |
231 // FIXME: add flush() | |
232 | |
233 public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; } | |
234 | |
235 // FIXME: add mark_as_seen_on_stack | |
236 // FIXME: add can_not_entrant_be_converted | |
237 | |
238 // FIXME: add GC support | |
239 // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading); | |
240 // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading); | |
241 // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*)); | |
242 // void adjust_pointers(); | |
243 | |
244 /** Finds a PCDesc with real-pc equal to "pc" */ | |
245 public PCDesc getPCDescAt(Address pc) { | |
246 // FIXME: consider adding cache like the one down in the VM | |
247 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { | |
248 PCDesc pcDesc = new PCDesc(p); | |
249 if (pcDesc.getRealPC(this).equals(pc)) { | |
250 return pcDesc; | |
251 } | |
252 } | |
253 return null; | |
254 } | |
255 | |
256 /** ScopeDesc for an instruction */ | |
257 public ScopeDesc getScopeDescAt(Address pc) { | |
258 PCDesc pd = getPCDescAt(pc); | |
259 if (Assert.ASSERTS_ENABLED) { | |
260 Assert.that(pd != null, "scope must be present"); | |
261 } | |
262 return new ScopeDesc(this, pd.getScopeDecodeOffset()); | |
263 } | |
264 | |
265 /** This is only for use by the debugging system, and is only | |
266 intended for use in the topmost frame, where we are not | |
267 guaranteed to be at a PC for which we have a PCDesc. It finds | |
268 the PCDesc with realPC closest to the current PC. */ | |
269 public PCDesc getPCDescNearDbg(Address pc) { | |
270 PCDesc bestGuessPCDesc = null; | |
271 long bestDistance = 0; | |
272 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { | |
273 PCDesc pcDesc = new PCDesc(p); | |
274 // In case pc is null | |
275 long distance = -pcDesc.getRealPC(this).minus(pc); | |
276 if ((bestGuessPCDesc == null) || | |
277 ((distance >= 0) && (distance < bestDistance))) { | |
278 bestGuessPCDesc = pcDesc; | |
279 bestDistance = distance; | |
280 } | |
281 } | |
282 return bestGuessPCDesc; | |
283 } | |
284 | |
285 /** This is only for use by the debugging system, and is only | |
286 intended for use in the topmost frame, where we are not | |
287 guaranteed to be at a PC for which we have a PCDesc. It finds | |
288 the ScopeDesc closest to the current PC. NOTE that this may | |
289 return NULL for compiled methods which don't have any | |
290 ScopeDescs! */ | |
291 public ScopeDesc getScopeDescNearDbg(Address pc) { | |
292 PCDesc pd = getPCDescNearDbg(pc); | |
293 if (pd == null) return null; | |
294 return new ScopeDesc(this, pd.getScopeDecodeOffset()); | |
295 } | |
296 | |
297 public Map/*<Address, PcDesc>*/ getSafepoints() { | |
298 Map safepoints = new HashMap(); // Map<Address, PcDesc> | |
299 sun.jvm.hotspot.debugger.Address p = null; | |
300 for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); | |
301 p = p.addOffsetTo(pcDescSize)) { | |
302 PCDesc pcDesc = new PCDesc(p); | |
303 sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this); | |
304 safepoints.put(pc, pcDesc); | |
305 } | |
306 return safepoints; | |
307 } | |
308 | |
309 // FIXME: add getPCOffsetForBCI() | |
310 // FIXME: add embeddedOopAt() | |
311 // FIXME: add isDependentOn() | |
312 // FIXME: add isPatchableAt() | |
313 | |
314 /** Support for code generation. Only here for proof-of-concept. */ | |
315 public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); } | |
316 public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); } | |
317 public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); } | |
318 public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); } | |
319 /** NOTE: renamed from "method_offset_in_bytes" */ | |
320 public static int getMethodOffset() { return (int) methodField.getOffset(); } | |
321 | |
322 public void print() { | |
323 printOn(System.out); | |
324 } | |
325 | |
326 public String toString() { | |
327 Method method = getMethod(); | |
328 return "NMethod for " + | |
329 method.getMethodHolder().getName().asString() + "." + | |
330 method.getName().asString() + method.getSignature().asString() + "==>n" + | |
331 super.toString(); | |
332 } | |
333 | |
334 public String flagsToString() { | |
335 // FIXME need access to flags... | |
336 return ""; | |
337 } | |
338 | |
339 public String getName() { | |
340 Method method = getMethod(); | |
341 return "NMethod for " + | |
342 method.getMethodHolder().getName().asString() + "." + | |
343 method.getName().asString() + | |
344 method.getSignature().asString(); | |
345 } | |
346 | |
347 //-------------------------------------------------------------------------------- | |
348 // Internals only below this point | |
349 // | |
350 | |
351 private int getEntryBCI() { return (int) entryBCIField .getValue(addr); } | |
352 private int getExceptionOffset() { return (int) exceptionOffsetField .getValue(addr); } | |
353 private int getDeoptOffset() { return (int) deoptOffsetField .getValue(addr); } | |
354 private int getStubOffset() { return (int) stubOffsetField .getValue(addr); } | |
355 private int getScopesDataOffset() { return (int) scopesDataOffsetField .getValue(addr); } | |
356 private int getScopesPCsOffset() { return (int) scopesPCsOffsetField .getValue(addr); } | |
357 private int getDependenciesOffset() { return (int) dependenciesOffsetField.getValue(addr); } | |
358 private int getHandlerTableOffset() { return (int) handlerTableOffsetField.getValue(addr); } | |
359 private int getNulChkTableOffset() { return (int) nulChkTableOffsetField .getValue(addr); } | |
360 private int getNMethodEndOffset() { return (int) nmethodEndOffsetField .getValue(addr); } | |
361 } |