1/* 2 * Copyright (c) 2000, 2016, 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 25package sun.jvm.hotspot.code; 26 27import java.io.*; 28import java.util.*; 29import sun.jvm.hotspot.debugger.*; 30import sun.jvm.hotspot.oops.*; 31import sun.jvm.hotspot.runtime.*; 32import sun.jvm.hotspot.types.*; 33import sun.jvm.hotspot.utilities.*; 34 35public class NMethod extends CompiledMethod { 36 private static long pcDescSize; 37 /** != InvocationEntryBci if this nmethod is an on-stack replacement method */ 38 private static CIntegerField entryBCIField; 39 /** To support simple linked-list chaining of nmethods */ 40 private static AddressField osrLinkField; 41 private static AddressField scavengeRootLinkField; 42 private static JByteField scavengeRootStateField; 43 44 /** Offsets for different nmethod parts */ 45 private static CIntegerField exceptionOffsetField; 46 private static CIntegerField origPCOffsetField; 47 private static CIntegerField stubOffsetField; 48 private static CIntegerField oopsOffsetField; 49 private static CIntegerField metadataOffsetField; 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 private static CIntegerField compLevelField; 77 78 static { 79 VM.registerVMInitializedObserver(new Observer() { 80 public void update(Observable o, Object data) { 81 initialize(VM.getVM().getTypeDataBase()); 82 } 83 }); 84 } 85 86 private static void initialize(TypeDataBase db) { 87 Type type = db.lookupType("nmethod"); 88 89 entryBCIField = type.getCIntegerField("_entry_bci"); 90 osrLinkField = type.getAddressField("_osr_link"); 91 scavengeRootLinkField = type.getAddressField("_scavenge_root_link"); 92 scavengeRootStateField = type.getJByteField("_scavenge_root_state"); 93 94 exceptionOffsetField = type.getCIntegerField("_exception_offset"); 95 origPCOffsetField = type.getCIntegerField("_orig_pc_offset"); 96 stubOffsetField = type.getCIntegerField("_stub_offset"); 97 oopsOffsetField = type.getCIntegerField("_oops_offset"); 98 metadataOffsetField = type.getCIntegerField("_metadata_offset"); 99 scopesPCsOffsetField = type.getCIntegerField("_scopes_pcs_offset"); 100 dependenciesOffsetField = type.getCIntegerField("_dependencies_offset"); 101 handlerTableOffsetField = type.getCIntegerField("_handler_table_offset"); 102 nulChkTableOffsetField = type.getCIntegerField("_nul_chk_table_offset"); 103 nmethodEndOffsetField = type.getCIntegerField("_nmethod_end_offset"); 104 entryPointField = type.getAddressField("_entry_point"); 105 verifiedEntryPointField = type.getAddressField("_verified_entry_point"); 106 osrEntryPointField = type.getAddressField("_osr_entry_point"); 107 lockCountField = type.getJIntField("_lock_count"); 108 stackTraversalMarkField = type.getCIntegerField("_stack_traversal_mark"); 109 compLevelField = type.getCIntegerField("_comp_level"); 110 pcDescSize = db.lookupType("PcDesc").getSize(); 111 } 112 113 public NMethod(Address addr) { 114 super(addr); 115 } 116 117 // Accessors 118 public Address getAddress() { 119 return addr; 120 } 121 122 // Type info 123 public boolean isNMethod() { return true; } 124 public boolean isJavaMethod() { return !getMethod().isNative(); } 125 public boolean isNativeMethod() { return getMethod().isNative(); } 126 public boolean isOSRMethod() { return getEntryBCI() != VM.getVM().getInvocationEntryBCI(); } 127 128 /** Boundaries for different parts */ 129 public Address constantsBegin() { return contentBegin(); } 130 public Address constantsEnd() { return getEntryPoint(); } 131 public Address instsBegin() { return codeBegin(); } 132 public Address instsEnd() { return headerBegin().addOffsetTo(getStubOffset()); } 133 public Address exceptionBegin() { return headerBegin().addOffsetTo(getExceptionOffset()); } 134 public Address stubBegin() { return headerBegin().addOffsetTo(getStubOffset()); } 135 public Address stubEnd() { return headerBegin().addOffsetTo(getOopsOffset()); } 136 public Address oopsBegin() { return headerBegin().addOffsetTo(getOopsOffset()); } 137 public Address oopsEnd() { return headerBegin().addOffsetTo(getMetadataOffset()); } 138 public Address metadataBegin() { return headerBegin().addOffsetTo(getMetadataOffset()); } 139 public Address metadataEnd() { return scopesDataBegin(); } 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 instsSize() { return (int) instsEnd() .minus(instsBegin()); } 152 public int stubSize() { return (int) stubEnd() .minus(stubBegin()); } 153 public int oopsSize() { return (int) oopsEnd() .minus(oopsBegin()); } 154 public int metadataSize() { return (int) metadataEnd() .minus(metadataBegin()); } 155 public int scopesDataSize() { return (int) scopesDataEnd() .minus(scopesDataBegin()); } 156 public int scopesPCsSize() { return (int) scopesPCsEnd() .minus(scopesPCsBegin()); } 157 public int dependenciesSize() { return (int) dependenciesEnd().minus(dependenciesBegin()); } 158 public int handlerTableSize() { return (int) handlerTableEnd().minus(handlerTableBegin()); } 159 public int nulChkTableSize() { return (int) nulChkTableEnd() .minus(nulChkTableBegin()); } 160 public int origPCOffset() { return (int) origPCOffsetField.getValue(addr); } 161 162 public int totalSize() { 163 return 164 constantsSize() + 165 instsSize() + 166 stubSize() + 167 scopesDataSize() + 168 scopesPCsSize() + 169 dependenciesSize() + 170 handlerTableSize() + 171 nulChkTableSize(); 172 } 173 174 public boolean constantsContains (Address addr) { return constantsBegin() .lessThanOrEqual(addr) && constantsEnd() .greaterThan(addr); } 175 public boolean instsContains (Address addr) { return instsBegin() .lessThanOrEqual(addr) && instsEnd() .greaterThan(addr); } 176 public boolean stubContains (Address addr) { return stubBegin() .lessThanOrEqual(addr) && stubEnd() .greaterThan(addr); } 177 public boolean oopsContains (Address addr) { return oopsBegin() .lessThanOrEqual(addr) && oopsEnd() .greaterThan(addr); } 178 public boolean metadataContains (Address addr) { return metadataBegin() .lessThanOrEqual(addr) && metadataEnd() .greaterThan(addr); } 179 public boolean scopesDataContains (Address addr) { return scopesDataBegin() .lessThanOrEqual(addr) && scopesDataEnd() .greaterThan(addr); } 180 public boolean scopesPCsContains (Address addr) { return scopesPCsBegin() .lessThanOrEqual(addr) && scopesPCsEnd() .greaterThan(addr); } 181 public boolean handlerTableContains(Address addr) { return handlerTableBegin().lessThanOrEqual(addr) && handlerTableEnd().greaterThan(addr); } 182 public boolean nulChkTableContains (Address addr) { return nulChkTableBegin() .lessThanOrEqual(addr) && nulChkTableEnd() .greaterThan(addr); } 183 184 public int getOopsLength() { return (int) (oopsSize() / VM.getVM().getOopSize()); } 185 public int getMetadataLength() { return (int) (metadataSize() / VM.getVM().getOopSize()); } 186 187 /** Entry points */ 188 public Address getEntryPoint() { return entryPointField.getValue(addr); } 189 public Address getVerifiedEntryPoint() { return verifiedEntryPointField.getValue(addr); } 190 191 /** Support for oops in scopes and relocs. Note: index 0 is reserved for null. */ 192 public OopHandle getOopAt(int index) { 193 if (index == 0) return null; 194 if (Assert.ASSERTS_ENABLED) { 195 Assert.that(index > 0 && index <= getOopsLength(), "must be a valid non-zero index"); 196 } 197 return oopsBegin().getOopHandleAt((index - 1) * VM.getVM().getOopSize()); 198 } 199 200 /** Support for metadata in scopes and relocs. Note: index 0 is reserved for null. */ 201 public Address getMetadataAt(int index) { 202 if (index == 0) return null; 203 if (Assert.ASSERTS_ENABLED) { 204 Assert.that(index > 0 && index <= getMetadataLength(), "must be a valid non-zero index"); 205 } 206 return metadataBegin().getAddressAt((index - 1) * VM.getVM().getOopSize()); 207 } 208 209 public Method getMethodAt(int index) { 210 return (Method)Metadata.instantiateWrapperFor(getMetadataAt(index)); 211 } 212 213 // FIXME: add interpreter_entry_point() 214 // FIXME: add lazy_interpreter_entry_point() for C2 215 216 // ********** 217 // * FIXME: * ADD ACCESS TO FLAGS!!!! 218 // ********** 219 // public boolean isInUse(); 220 // public boolean isAlive(); 221 // public boolean isNotEntrant(); 222 // public boolean isZombie(); 223 224 // ******************************** 225 // * MAJOR FIXME: MAJOR HACK HERE * 226 // ******************************** 227 public boolean isZombie() { return false; } 228 229 // public boolean isUnloaded(); 230 // public boolean isYoung(); 231 // public boolean isOld(); 232 // public int age(); 233 // public boolean isMarkedForDeoptimization(); 234 // public boolean isMarkedForUnloading(); 235 // public int level(); 236 // public int version(); 237 238 // FIXME: add mutators for above 239 // FIXME: add exception cache access? 240 241 /** On-stack replacement support */ 242 // FIXME: add mutators 243 public int getOSREntryBCI() { 244 if (Assert.ASSERTS_ENABLED) { 245 Assert.that(getEntryBCI() != VM.getVM().getInvocationEntryBCI(), "wrong kind of nmethod"); 246 } 247 return getEntryBCI(); 248 } 249 250 public NMethod getOSRLink() { 251 return (NMethod) VMObjectFactory.newObject(NMethod.class, osrLinkField.getValue(addr)); 252 } 253 254 public NMethod getScavengeRootLink() { 255 return (NMethod) VMObjectFactory.newObject(NMethod.class, scavengeRootLinkField.getValue(addr)); 256 } 257 258 public int getScavengeRootState() { 259 return (int) scavengeRootStateField.getValue(addr); 260 } 261 262 // MethodHandle 263 public boolean isMethodHandleReturn(Address returnPc) { 264 // Hard to read a bit fields from Java and it's only there for performance 265 // so just go directly to the PCDesc 266 // if (!hasMethodHandleInvokes()) return false; 267 PCDesc pd = getPCDescAt(returnPc); 268 if (pd == null) 269 return false; 270 return pd.isMethodHandleInvoke(); 271 } 272 273 // Deopt 274 // Return true is the PC is one would expect if the frame is being deopted. 275 public boolean isDeoptPc (Address pc) { return isDeoptEntry(pc) || isDeoptMhEntry(pc); } 276 public boolean isDeoptEntry (Address pc) { return pc == deoptHandlerBegin(); } 277 public boolean isDeoptMhEntry (Address pc) { return pc == deoptMhHandlerBegin(); } 278 279 /** Tells whether frames described by this nmethod can be 280 deoptimized. Note: native wrappers cannot be deoptimized. */ 281 public boolean canBeDeoptimized() { return isJavaMethod(); } 282 283 // FIXME: add inline cache support 284 // FIXME: add flush() 285 286 public boolean isLockedByVM() { return lockCountField.getValue(addr) > 0; } 287 288 // FIXME: add mark_as_seen_on_stack 289 // FIXME: add can_not_entrant_be_converted 290 291 // FIXME: add GC support 292 // void follow_roots_or_mark_for_unloading(bool unloading_occurred, bool& marked_for_unloading); 293 // void follow_root_or_mark_for_unloading(oop* root, bool unloading_occurred, bool& marked_for_unloading); 294 // void preserve_callee_argument_oops(frame fr, const RegisterMap *reg_map, void f(oop*)); 295 // void adjust_pointers(); 296 297 /** Finds a PCDesc with real-pc equal to "pc" */ 298 public PCDesc getPCDescAt(Address pc) { 299 // FIXME: consider adding cache like the one down in the VM 300 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { 301 PCDesc pcDesc = new PCDesc(p); 302 if (pcDesc.getRealPC(this).equals(pc)) { 303 return pcDesc; 304 } 305 } 306 return null; 307 } 308 309 /** ScopeDesc for an instruction */ 310 public ScopeDesc getScopeDescAt(Address pc) { 311 PCDesc pd = getPCDescAt(pc); 312 if (Assert.ASSERTS_ENABLED) { 313 Assert.that(pd != null, "scope must be present"); 314 } 315 return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute()); 316 } 317 318 /** This is only for use by the debugging system, and is only 319 intended for use in the topmost frame, where we are not 320 guaranteed to be at a PC for which we have a PCDesc. It finds 321 the PCDesc with realPC closest to the current PC. */ 322 public PCDesc getPCDescNearDbg(Address pc) { 323 PCDesc bestGuessPCDesc = null; 324 long bestDistance = 0; 325 for (Address p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); p = p.addOffsetTo(pcDescSize)) { 326 PCDesc pcDesc = new PCDesc(p); 327 // In case pc is null 328 long distance = -pcDesc.getRealPC(this).minus(pc); 329 if ((bestGuessPCDesc == null) || 330 ((distance >= 0) && (distance < bestDistance))) { 331 bestGuessPCDesc = pcDesc; 332 bestDistance = distance; 333 } 334 } 335 return bestGuessPCDesc; 336 } 337 338 PCDesc find_pc_desc(long pc, boolean approximate) { 339 return find_pc_desc_internal(pc, approximate); 340 } 341 342 // Finds a PcDesc with real-pc equal to "pc" 343 PCDesc find_pc_desc_internal(long pc, boolean approximate) { 344 long base_address = VM.getAddressValue(codeBegin()); 345 int pc_offset = (int) (pc - base_address); 346 347 // Fallback algorithm: quasi-linear search for the PcDesc 348 // Find the last pc_offset less than the given offset. 349 // The successor must be the required match, if there is a match at all. 350 // (Use a fixed radix to avoid expensive affine pointer arithmetic.) 351 Address lower = scopesPCsBegin(); 352 Address upper = scopesPCsEnd(); 353 upper = upper.addOffsetTo(-pcDescSize); // exclude final sentinel 354 if (lower.greaterThan(upper)) return null; // native method; no PcDescs at all 355 356 // Take giant steps at first (4096, then 256, then 16, then 1) 357 int LOG2_RADIX = 4; 358 int RADIX = (1 << LOG2_RADIX); 359 Address mid; 360 for (int step = (1 << (LOG2_RADIX*3)); step > 1; step >>= LOG2_RADIX) { 361 while ((mid = lower.addOffsetTo(step * pcDescSize)).lessThan(upper)) { 362 PCDesc m = new PCDesc(mid); 363 if (m.getPCOffset() < pc_offset) { 364 lower = mid; 365 } else { 366 upper = mid; 367 break; 368 } 369 } 370 } 371 // Sneak up on the value with a linear search of length ~16. 372 while (true) { 373 mid = lower.addOffsetTo(pcDescSize); 374 PCDesc m = new PCDesc(mid); 375 if (m.getPCOffset() < pc_offset) { 376 lower = mid; 377 } else { 378 upper = mid; 379 break; 380 } 381 } 382 383 PCDesc u = new PCDesc(upper); 384 if (match_desc(u, pc_offset, approximate)) { 385 return u; 386 } else { 387 return null; 388 } 389 } 390 391 // ScopeDesc retrieval operation 392 PCDesc pc_desc_at(long pc) { return find_pc_desc(pc, false); } 393 // pc_desc_near returns the first PCDesc at or after the givne pc. 394 PCDesc pc_desc_near(long pc) { return find_pc_desc(pc, true); } 395 396 // Return a the last scope in (begin..end] 397 public ScopeDesc scope_desc_in(long begin, long end) { 398 PCDesc p = pc_desc_near(begin+1); 399 if (p != null && VM.getAddressValue(p.getRealPC(this)) <= end) { 400 return new ScopeDesc(this, p.getScopeDecodeOffset(), p.getObjDecodeOffset(), p.getReexecute()); 401 } 402 return null; 403 } 404 405 static boolean match_desc(PCDesc pc, int pc_offset, boolean approximate) { 406 if (!approximate) { 407 return pc.getPCOffset() == pc_offset; 408 } else { 409 PCDesc prev = new PCDesc(pc.getAddress().addOffsetTo(-pcDescSize)); 410 return prev.getPCOffset() < pc_offset && pc_offset <= pc.getPCOffset(); 411 } 412 } 413 414 /** This is only for use by the debugging system, and is only 415 intended for use in the topmost frame, where we are not 416 guaranteed to be at a PC for which we have a PCDesc. It finds 417 the ScopeDesc closest to the current PC. NOTE that this may 418 return NULL for compiled methods which don't have any 419 ScopeDescs! */ 420 public ScopeDesc getScopeDescNearDbg(Address pc) { 421 PCDesc pd = getPCDescNearDbg(pc); 422 if (pd == null) return null; 423 return new ScopeDesc(this, pd.getScopeDecodeOffset(), pd.getObjDecodeOffset(), pd.getReexecute()); 424 } 425 426 public Map/*<Address, PCDesc>*/ getSafepoints() { 427 Map safepoints = new HashMap(); // Map<Address, PCDesc> 428 sun.jvm.hotspot.debugger.Address p = null; 429 for (p = scopesPCsBegin(); p.lessThan(scopesPCsEnd()); 430 p = p.addOffsetTo(pcDescSize)) { 431 PCDesc pcDesc = new PCDesc(p); 432 sun.jvm.hotspot.debugger.Address pc = pcDesc.getRealPC(this); 433 safepoints.put(pc, pcDesc); 434 } 435 return safepoints; 436 } 437 438 // FIXME: add getPCOffsetForBCI() 439 // FIXME: add embeddedOopAt() 440 // FIXME: add isDependentOn() 441 // FIXME: add isPatchableAt() 442 443 /** Support for code generation. Only here for proof-of-concept. */ 444 public static int getEntryPointOffset() { return (int) entryPointField.getOffset(); } 445 public static int getVerifiedEntryPointOffset() { return (int) verifiedEntryPointField.getOffset(); } 446 public static int getOSREntryPointOffset() { return (int) osrEntryPointField.getOffset(); } 447 public static int getEntryBCIOffset() { return (int) entryBCIField.getOffset(); } 448 449 public void print() { 450 printOn(System.out); 451 } 452 453 protected void printComponentsOn(PrintStream tty) { 454 // FIXME: add relocation information 455 tty.println(" content: [" + contentBegin() + ", " + contentEnd() + "), " + 456 " code: [" + codeBegin() + ", " + codeEnd() + "), " + 457 " data: [" + dataBegin() + ", " + dataEnd() + "), " + 458 " oops: [" + oopsBegin() + ", " + oopsEnd() + "), " + 459 " frame size: " + getFrameSize()); 460 } 461 462 public String toString() { 463 Method method = getMethod(); 464 return "NMethod for " + 465 method.getMethodHolder().getName().asString() + "." + 466 method.getName().asString() + method.getSignature().asString() + "==>n" + 467 super.toString(); 468 } 469 470 public String flagsToString() { 471 // FIXME need access to flags... 472 return ""; 473 } 474 475 public String getName() { 476 Method method = getMethod(); 477 return "NMethod for " + 478 method.getMethodHolder().getName().asString() + "." + 479 method.getName().asString() + 480 method.getSignature().asString(); 481 } 482 483 public void dumpReplayData(PrintStream out) { 484 HashMap h = new HashMap(); 485 for (int i = 1; i < getMetadataLength(); i++) { 486 Metadata meta = Metadata.instantiateWrapperFor(getMetadataAt(i)); 487 System.err.println(meta); 488 if (h.get(meta) != null) continue; 489 h.put(meta, meta); 490 if (meta instanceof InstanceKlass) { 491 ((InstanceKlass)meta).dumpReplayData(out); 492 } else if (meta instanceof Method) { 493 ((Method)meta).dumpReplayData(out); 494 MethodData mdo = ((Method)meta).getMethodData(); 495 if (mdo != null) { 496 mdo.dumpReplayData(out); 497 } 498 } 499 } 500 Method method = getMethod(); 501 if (h.get(method) == null) { 502 method.dumpReplayData(out); 503 MethodData mdo = method.getMethodData(); 504 if (mdo != null) { 505 mdo.dumpReplayData(out); 506 } 507 } 508 if (h.get(method.getMethodHolder()) == null) { 509 ((InstanceKlass)method.getMethodHolder()).dumpReplayData(out); 510 } 511 Klass holder = method.getMethodHolder(); 512 out.println("compile " + holder.getName().asString() + " " + 513 OopUtilities.escapeString(method.getName().asString()) + " " + 514 method.getSignature().asString() + " " + 515 getEntryBCI() + " " + getCompLevel()); 516 517 } 518 519 //-------------------------------------------------------------------------------- 520 // Internals only below this point 521 // 522 523 private int getEntryBCI() { return (int) entryBCIField .getValue(addr); } 524 private int getExceptionOffset() { return (int) exceptionOffsetField .getValue(addr); } 525 private int getStubOffset() { return (int) stubOffsetField .getValue(addr); } 526 private int getOopsOffset() { return (int) oopsOffsetField .getValue(addr); } 527 private int getMetadataOffset() { return (int) metadataOffsetField .getValue(addr); } 528 private int getScopesPCsOffset() { return (int) scopesPCsOffsetField .getValue(addr); } 529 private int getDependenciesOffset() { return (int) dependenciesOffsetField.getValue(addr); } 530 private int getHandlerTableOffset() { return (int) handlerTableOffsetField.getValue(addr); } 531 private int getNulChkTableOffset() { return (int) nulChkTableOffsetField .getValue(addr); } 532 private int getNMethodEndOffset() { return (int) nmethodEndOffsetField .getValue(addr); } 533 private int getCompLevel() { return (int) compLevelField .getValue(addr); } 534} 535