1 /*
2 * Copyright (c) 2011, 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 package jdk.vm.ci.hotspot;
24
25 import static jdk.vm.ci.hotspot.CompilerToVM.compilerToVM;
26 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
27 import static jdk.vm.ci.hotspot.HotSpotModifiers.BRIDGE;
28 import static jdk.vm.ci.hotspot.HotSpotModifiers.SYNTHETIC;
29 import static jdk.vm.ci.hotspot.HotSpotModifiers.VARARGS;
30 import static jdk.vm.ci.hotspot.HotSpotModifiers.jvmMethodModifiers;
31 import static jdk.vm.ci.hotspot.HotSpotVMConfig.config;
32 import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE;
33
34 import java.lang.annotation.Annotation;
35 import java.lang.reflect.Executable;
36 import java.lang.reflect.Modifier;
37 import java.lang.reflect.Type;
38 import java.util.HashMap;
39 import java.util.Map;
40
41 import jdk.vm.ci.common.JVMCIError;
42 import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.Option;
43 import jdk.vm.ci.meta.Constant;
44 import jdk.vm.ci.meta.ConstantPool;
45 import jdk.vm.ci.meta.DefaultProfilingInfo;
46 import jdk.vm.ci.meta.ExceptionHandler;
47 import jdk.vm.ci.meta.JavaMethod;
48 import jdk.vm.ci.meta.JavaType;
49 import jdk.vm.ci.meta.LineNumberTable;
50 import jdk.vm.ci.meta.Local;
51 import jdk.vm.ci.meta.LocalVariableTable;
52 import jdk.vm.ci.meta.ProfilingInfo;
53 import jdk.vm.ci.meta.ResolvedJavaMethod;
54 import jdk.vm.ci.meta.ResolvedJavaType;
55 import jdk.vm.ci.meta.Signature;
56 import jdk.vm.ci.meta.SpeculationLog;
57 import jdk.vm.ci.meta.TriState;
58
59 /**
60 * Implementation of {@link JavaMethod} for resolved HotSpot methods.
61 */
62 final class HotSpotResolvedJavaMethodImpl extends HotSpotMethod implements HotSpotResolvedJavaMethod, MetaspaceWrapperObject {
63
64 /**
65 * Reference to metaspace Method object.
66 */
67 private final long metaspaceMethod;
68
69 private final HotSpotResolvedObjectTypeImpl holder;
70 private final HotSpotConstantPool constantPool;
71 private final HotSpotSignature signature;
72 private HotSpotMethodData methodData;
73 private byte[] code;
74 private Executable toJavaCache;
75
76 /**
77 * Gets the holder of a HotSpot metaspace method native object.
78 *
79 * @param metaspaceMethod a metaspace Method object
80 * @return the {@link ResolvedJavaType} corresponding to the holder of the
81 * {@code metaspaceMethod}
82 */
83 private static HotSpotResolvedObjectTypeImpl getHolder(long metaspaceMethod) {
84 HotSpotVMConfig config = config();
85 final long metaspaceConstMethod = UNSAFE.getAddress(metaspaceMethod + config.methodConstMethodOffset);
86 final long metaspaceConstantPool = UNSAFE.getAddress(metaspaceConstMethod + config.constMethodConstantsOffset);
87 return compilerToVM().getResolvedJavaType(null, metaspaceConstantPool + config.constantPoolHolderOffset, false);
88 }
89
90 /**
91 * Gets the JVMCI mirror from a HotSpot method. The VM is responsible for ensuring that the
92 * Method* is kept alive for the duration of this call and the
93 * {@link HotSpotJVMCIMetaAccessContext} keeps it alive after that.
94 *
95 * Called from the VM.
96 *
97 * @param metaspaceMethod a metaspace Method object
98 * @return the {@link ResolvedJavaMethod} corresponding to {@code metaspaceMethod}
99 */
100 @SuppressWarnings("unused")
101 private static HotSpotResolvedJavaMethod fromMetaspace(long metaspaceMethod) {
102 HotSpotResolvedObjectTypeImpl holder = getHolder(metaspaceMethod);
103 return holder.createMethod(metaspaceMethod);
104 }
105
106 HotSpotResolvedJavaMethodImpl(HotSpotResolvedObjectTypeImpl holder, long metaspaceMethod) {
107 // It would be too much work to get the method name here so we fill it in later.
108 super(null);
109 this.metaspaceMethod = metaspaceMethod;
110 this.holder = holder;
111
112 HotSpotVMConfig config = config();
113 final long constMethod = getConstMethod();
114
115 /*
116 * Get the constant pool from the metaspace method. Some methods (e.g. intrinsics for
117 * signature-polymorphic method handle methods) have their own constant pool instead of the
118 * one from their holder.
119 */
120 final long metaspaceConstantPool = UNSAFE.getAddress(constMethod + config.constMethodConstantsOffset);
121 if (metaspaceConstantPool == holder.getConstantPool().getMetaspaceConstantPool()) {
122 this.constantPool = holder.getConstantPool();
123 } else {
124 this.constantPool = compilerToVM().getConstantPool(this);
125 }
126
127 final int nameIndex = UNSAFE.getChar(constMethod + config.constMethodNameIndexOffset);
128 this.name = constantPool.lookupUtf8(nameIndex);
129
130 final int signatureIndex = UNSAFE.getChar(constMethod + config.constMethodSignatureIndexOffset);
131 this.signature = (HotSpotSignature) constantPool.lookupSignature(signatureIndex);
132 }
133
134 /**
135 * Returns a pointer to this method's constant method data structure (
136 * {@code Method::_constMethod}). This pointer isn't wrapped since it should be safe to use it
137 * within the context of this HotSpotResolvedJavaMethodImpl since the Method* and ConstMethod*
138 * are kept alive as a pair.
139 *
140 * @return pointer to this method's ConstMethod
141 */
142 private long getConstMethod() {
143 assert metaspaceMethod != 0;
144 return UNSAFE.getAddress(metaspaceMethod + config().methodConstMethodOffset);
145 }
146
147 @Override
148 public boolean equals(Object obj) {
149 if (this == obj) {
150 return true;
151 }
152 if (obj instanceof HotSpotResolvedJavaMethodImpl) {
153 HotSpotResolvedJavaMethodImpl that = (HotSpotResolvedJavaMethodImpl) obj;
154 return that.metaspaceMethod == metaspaceMethod;
155 }
156 return false;
157 }
158
159 @Override
160 public int hashCode() {
161 return (int) metaspaceMethod;
162 }
163
164 /**
165 * Returns this method's flags ({@code Method::_flags}).
166 *
167 * @return flags of this method
168 */
169 private int getFlags() {
170 return UNSAFE.getShort(metaspaceMethod + config().methodFlagsOffset);
171 }
172
173 /**
174 * Returns this method's constant method flags ({@code ConstMethod::_flags}).
175 *
176 * @return flags of this method's ConstMethod
177 */
178 private int getConstMethodFlags() {
179 return UNSAFE.getChar(getConstMethod() + config().constMethodFlagsOffset);
180 }
181
182 @Override
183 public HotSpotResolvedObjectTypeImpl getDeclaringClass() {
184 return holder;
185 }
186
187 /**
188 * Gets the address of the C++ Method object for this method.
189 */
190 public Constant getMetaspaceMethodConstant() {
191 return HotSpotMetaspaceConstantImpl.forMetaspaceObject(this, false);
192 }
193
194 public long getMetaspacePointer() {
195 return metaspaceMethod;
196 }
197
198 @Override
199 public Constant getEncoding() {
200 return getMetaspaceMethodConstant();
201 }
202
203 /**
204 * Gets the complete set of modifiers for this method which includes the JVM specification
205 * modifiers as well as the HotSpot internal modifiers.
206 */
207 public int getAllModifiers() {
208 return UNSAFE.getInt(metaspaceMethod + config().methodAccessFlagsOffset);
209 }
210
211 @Override
212 public int getModifiers() {
213 return getAllModifiers() & jvmMethodModifiers();
214 }
215
216 @Override
217 public boolean canBeStaticallyBound() {
218 return (isFinal() || isPrivate() || isStatic() || holder.isLeaf()) && isConcrete();
219 }
220
221 @Override
222 public byte[] getCode() {
223 if (getCodeSize() == 0) {
224 return null;
225 }
226 if (code == null && holder.isLinked()) {
227 code = compilerToVM().getBytecode(this);
228 assert code.length == getCodeSize() : "expected: " + getCodeSize() + ", actual: " + code.length;
229 }
230 return code;
231 }
232
233 @Override
234 public int getCodeSize() {
235 return UNSAFE.getChar(getConstMethod() + config().constMethodCodeSizeOffset);
236 }
237
238 @Override
239 public ExceptionHandler[] getExceptionHandlers() {
240 final boolean hasExceptionTable = (getConstMethodFlags() & config().constMethodHasExceptionTable) != 0;
241 if (!hasExceptionTable) {
242 return new ExceptionHandler[0];
243 }
244
245 HotSpotVMConfig config = config();
246 final int exceptionTableLength = compilerToVM().getExceptionTableLength(this);
247 ExceptionHandler[] handlers = new ExceptionHandler[exceptionTableLength];
248 long exceptionTableElement = compilerToVM().getExceptionTableStart(this);
249
250 for (int i = 0; i < exceptionTableLength; i++) {
251 final int startPc = UNSAFE.getChar(exceptionTableElement + config.exceptionTableElementStartPcOffset);
252 final int endPc = UNSAFE.getChar(exceptionTableElement + config.exceptionTableElementEndPcOffset);
253 final int handlerPc = UNSAFE.getChar(exceptionTableElement + config.exceptionTableElementHandlerPcOffset);
254 int catchTypeIndex = UNSAFE.getChar(exceptionTableElement + config.exceptionTableElementCatchTypeIndexOffset);
255
256 JavaType catchType;
257 if (catchTypeIndex == 0) {
258 catchType = null;
259 } else {
260 final int opcode = -1; // opcode is not used
261 catchType = constantPool.lookupType(catchTypeIndex, opcode);
262
263 // Check for Throwable which catches everything.
264 if (catchType instanceof HotSpotResolvedObjectTypeImpl) {
265 HotSpotResolvedObjectTypeImpl resolvedType = (HotSpotResolvedObjectTypeImpl) catchType;
266 if (resolvedType.mirror() == Throwable.class) {
267 catchTypeIndex = 0;
268 catchType = null;
269 }
270 }
271 }
272 handlers[i] = new ExceptionHandler(startPc, endPc, handlerPc, catchTypeIndex, catchType);
273
274 // Go to the next ExceptionTableElement
275 exceptionTableElement += config.exceptionTableElementSize;
276 }
277
278 return handlers;
279 }
280
281 /**
282 * Returns true if this method has a {@code CallerSensitive} annotation.
283 *
284 * @return true if CallerSensitive annotation present, false otherwise
285 */
286 public boolean isCallerSensitive() {
287 return (getFlags() & config().methodFlagsCallerSensitive) != 0;
288 }
289
290 /**
291 * Returns true if this method has a {@code ForceInline} annotation.
292 *
293 * @return true if ForceInline annotation present, false otherwise
294 */
295 public boolean isForceInline() {
296 return (getFlags() & config().methodFlagsForceInline) != 0;
297 }
298
299 /**
300 * Returns true if this method has a {@code DontInline} annotation.
301 *
302 * @return true if DontInline annotation present, false otherwise
303 */
304 public boolean isDontInline() {
305 return (getFlags() & config().methodFlagsDontInline) != 0;
306 }
307
308 /**
309 * Returns true if this method has a {@code ReservedStackAccess} annotation.
310 *
311 * @return true if ReservedStackAccess annotation present, false otherwise
312 */
313 public boolean hasReservedStackAccess() {
314 return (getFlags() & config().methodFlagsReservedStackAccess) != 0;
315 }
316
317 /**
318 * Manually adds a DontInline annotation to this method.
319 */
320 public void setNotInlineable() {
321 compilerToVM().doNotInlineOrCompile(this);
322 }
323
324 /**
325 * Returns true if this method is one of the special methods that is ignored by security stack
326 * walks.
327 *
328 * @return true if special method ignored by security stack walks, false otherwise
329 */
330 public boolean ignoredBySecurityStackWalk() {
331 return compilerToVM().methodIsIgnoredBySecurityStackWalk(this);
332 }
333
334 @Override
335 public boolean isClassInitializer() {
336 return "<clinit>".equals(name) && isStatic();
337 }
338
339 @Override
340 public boolean isConstructor() {
341 return "<init>".equals(name) && !isStatic();
342 }
343
344 @Override
345 public int getMaxLocals() {
346 if (isAbstract() || isNative()) {
347 return 0;
348 }
349 HotSpotVMConfig config = config();
350 return UNSAFE.getChar(getConstMethod() + config.methodMaxLocalsOffset);
351 }
352
353 @Override
354 public int getMaxStackSize() {
355 if (isAbstract() || isNative()) {
356 return 0;
357 }
358 HotSpotVMConfig config = config();
359 return config.extraStackEntries + UNSAFE.getChar(getConstMethod() + config.constMethodMaxStackOffset);
360 }
361
362 @Override
363 public StackTraceElement asStackTraceElement(int bci) {
364 if (bci < 0 || bci >= getCodeSize()) {
365 // HotSpot code can only construct stack trace elements for valid bcis
366 StackTraceElement ste = compilerToVM().getStackTraceElement(this, 0);
367 return new StackTraceElement(ste.getClassName(), ste.getMethodName(), ste.getFileName(), -1);
368 }
369 return compilerToVM().getStackTraceElement(this, bci);
370 }
371
372 public ResolvedJavaMethod uniqueConcreteMethod(HotSpotResolvedObjectType receiver) {
373 if (receiver.isInterface()) {
374 // Cannot trust interfaces. Because of:
375 // interface I { void foo(); }
376 // class A { public void foo() {} }
377 // class B extends A implements I { }
378 // class C extends B { public void foo() { } }
379 // class D extends B { }
380 // Would lead to identify C.foo() as the unique concrete method for I.foo() without
381 // seeing A.foo().
382 return null;
383 }
384 if (this.isDefault()) {
385 // CHA for default methods doesn't work and may crash the VM
386 return null;
387 }
388 return compilerToVM().findUniqueConcreteMethod(((HotSpotResolvedObjectTypeImpl) receiver), this);
389 }
390
391 @Override
392 public HotSpotSignature getSignature() {
393 return signature;
394 }
395
396 /**
397 * Gets the value of {@code Method::_code}.
398 *
399 * @return the value of {@code Method::_code}
400 */
401 private long getCompiledCode() {
402 HotSpotVMConfig config = config();
403 return UNSAFE.getAddress(metaspaceMethod + config.methodCodeOffset);
404 }
405
406 /**
407 * Returns whether this method has compiled code.
408 *
409 * @return true if this method has compiled code, false otherwise
410 */
411 public boolean hasCompiledCode() {
412 return getCompiledCode() != 0L;
413 }
414
415 /**
416 * @param level
417 * @return true if the currently installed code was generated at {@code level}.
418 */
419 public boolean hasCompiledCodeAtLevel(int level) {
420 long compiledCode = getCompiledCode();
421 if (compiledCode != 0) {
422 return UNSAFE.getInt(compiledCode + config().nmethodCompLevelOffset) == level;
423 }
424 return false;
425 }
426
427 @Override
428 public ProfilingInfo getProfilingInfo(boolean includeNormal, boolean includeOSR) {
429 ProfilingInfo info;
430
431 if (methodData == null) {
432 long metaspaceMethodData = UNSAFE.getAddress(metaspaceMethod + config().methodDataOffset);
433 if (metaspaceMethodData != 0) {
434 methodData = new HotSpotMethodData(metaspaceMethodData, this);
435 String methodDataFilter = Option.TraceMethodDataFilter.getString();
436 if (methodDataFilter != null && this.format("%H.%n").contains(methodDataFilter)) {
437 System.out.println("Raw method data for " + this.format("%H.%n(%p)") + ":");
438 System.out.println(methodData.toString());
439 }
440 }
441 }
442
443 if (methodData == null || (!methodData.hasNormalData() && !methodData.hasExtraData())) {
444 // Be optimistic and return false for exceptionSeen. A methodDataOop is allocated in
445 // case of a deoptimization.
446 info = DefaultProfilingInfo.get(TriState.FALSE);
447 } else {
448 info = new HotSpotProfilingInfo(methodData, this, includeNormal, includeOSR);
449 }
450 return info;
451 }
452
453 @Override
454 public void reprofile() {
455 compilerToVM().reprofile(this);
456 }
457
458 @Override
459 public ConstantPool getConstantPool() {
460 return constantPool;
461 }
462
463 @Override
464 public Annotation[][] getParameterAnnotations() {
465 Executable javaMethod = toJava();
466 return javaMethod == null ? null : javaMethod.getParameterAnnotations();
467 }
468
469 @Override
470 public Annotation[] getAnnotations() {
471 Executable javaMethod = toJava();
472 if (javaMethod != null) {
473 return javaMethod.getAnnotations();
474 }
475 return new Annotation[0];
476 }
477
478 @Override
479 public Annotation[] getDeclaredAnnotations() {
480 Executable javaMethod = toJava();
481 if (javaMethod != null) {
482 return javaMethod.getDeclaredAnnotations();
483 }
484 return new Annotation[0];
485 }
486
487 @Override
488 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
489 Executable javaMethod = toJava();
490 return javaMethod == null ? null : javaMethod.getAnnotation(annotationClass);
491 }
492
493 public boolean isBridge() {
494 return (BRIDGE & getModifiers()) != 0;
495 }
496
497 @Override
498 public boolean isSynthetic() {
499 return (SYNTHETIC & getModifiers()) != 0;
500 }
501
502 public boolean isVarArgs() {
503 return (VARARGS & getModifiers()) != 0;
504 }
505
506 public boolean isDefault() {
507 if (isConstructor()) {
508 return false;
509 }
510 // Copied from java.lang.Method.isDefault()
511 int mask = Modifier.ABSTRACT | Modifier.PUBLIC | Modifier.STATIC;
512 return ((getModifiers() & mask) == Modifier.PUBLIC) && getDeclaringClass().isInterface();
513 }
514
515 @Override
516 public Type[] getGenericParameterTypes() {
517 Executable javaMethod = toJava();
518 return javaMethod == null ? null : javaMethod.getGenericParameterTypes();
519 }
520
521 public Class<?>[] signatureToTypes() {
522 Signature sig = getSignature();
523 int count = sig.getParameterCount(false);
524 Class<?>[] result = new Class<?>[count];
525 for (int i = 0; i < result.length; ++i) {
526 JavaType parameterType = sig.getParameterType(i, holder);
527 HotSpotResolvedJavaType resolvedParameterType = (HotSpotResolvedJavaType) parameterType.resolve(holder);
528 result[i] = resolvedParameterType.mirror();
529 }
530 return result;
531 }
532
533 private Executable toJava() {
534 if (toJavaCache != null) {
535 return toJavaCache;
536 }
537 try {
538 Class<?>[] parameterTypes = signatureToTypes();
539 Executable result = isConstructor() ? holder.mirror().getDeclaredConstructor(parameterTypes) : holder.mirror().getDeclaredMethod(name, parameterTypes);
540 toJavaCache = result;
541 return result;
542 } catch (NoSuchMethodException | NoClassDefFoundError e) {
543 return null;
544 }
545 }
546
547 @Override
548 public boolean canBeInlined() {
549 if (isDontInline()) {
550 return false;
551 }
552 return compilerToVM().canInlineMethod(this);
553 }
554
555 @Override
556 public boolean shouldBeInlined() {
557 if (isForceInline()) {
558 return true;
559 }
560 return compilerToVM().shouldInlineMethod(this);
561 }
562
563 @Override
564 public LineNumberTable getLineNumberTable() {
565 final boolean hasLineNumberTable = (getConstMethodFlags() & config().constMethodHasLineNumberTable) != 0;
566 if (!hasLineNumberTable) {
567 return null;
568 }
569
570 long[] values = compilerToVM().getLineNumberTable(this);
571 if (values == null || values.length == 0) {
572 // Empty table so treat is as non-existent
573 return null;
574 }
575 assert values.length % 2 == 0;
576 int[] bci = new int[values.length / 2];
577 int[] line = new int[values.length / 2];
578
579 for (int i = 0; i < values.length / 2; i++) {
580 bci[i] = (int) values[i * 2];
581 line[i] = (int) values[i * 2 + 1];
582 }
583
584 return new LineNumberTable(line, bci);
585 }
586
587 @Override
588 public LocalVariableTable getLocalVariableTable() {
589 final boolean hasLocalVariableTable = (getConstMethodFlags() & config().constMethodHasLocalVariableTable) != 0;
590 if (!hasLocalVariableTable) {
591 return null;
592 }
593
594 HotSpotVMConfig config = config();
595 long localVariableTableElement = compilerToVM().getLocalVariableTableStart(this);
596 final int localVariableTableLength = compilerToVM().getLocalVariableTableLength(this);
597 Local[] locals = new Local[localVariableTableLength];
598
599 for (int i = 0; i < localVariableTableLength; i++) {
600 final int startBci = UNSAFE.getChar(localVariableTableElement + config.localVariableTableElementStartBciOffset);
601 final int endBci = startBci + UNSAFE.getChar(localVariableTableElement + config.localVariableTableElementLengthOffset);
602 final int nameCpIndex = UNSAFE.getChar(localVariableTableElement + config.localVariableTableElementNameCpIndexOffset);
603 final int typeCpIndex = UNSAFE.getChar(localVariableTableElement + config.localVariableTableElementDescriptorCpIndexOffset);
604 final int slot = UNSAFE.getChar(localVariableTableElement + config.localVariableTableElementSlotOffset);
605
606 String localName = getConstantPool().lookupUtf8(nameCpIndex);
607 String localType = getConstantPool().lookupUtf8(typeCpIndex);
608
609 locals[i] = new Local(localName, runtime().lookupType(localType, holder, false), startBci, endBci, slot);
610
611 // Go to the next LocalVariableTableElement
612 localVariableTableElement += config.localVariableTableElementSize;
613 }
614
615 return new LocalVariableTable(locals);
616 }
617
618 /**
619 * Returns the offset of this method into the v-table. The method must have a v-table entry as
620 * indicated by {@link #isInVirtualMethodTable(ResolvedJavaType)}, otherwise an exception is
621 * thrown.
622 *
623 * @return the offset of this method into the v-table
624 */
625 public int vtableEntryOffset(ResolvedJavaType resolved) {
626 if (!isInVirtualMethodTable(resolved)) {
627 throw new JVMCIError("%s does not have a vtable entry in type %s", this, resolved);
628 }
629 HotSpotVMConfig config = config();
630 final int vtableIndex = getVtableIndex((HotSpotResolvedObjectTypeImpl) resolved);
631 return config.klassVtableStartOffset + vtableIndex * config.vtableEntrySize + config.vtableEntryMethodOffset;
632 }
633
634 @Override
635 public boolean isInVirtualMethodTable(ResolvedJavaType resolved) {
636 if (resolved instanceof HotSpotResolvedObjectTypeImpl) {
637 HotSpotResolvedObjectTypeImpl hotspotResolved = (HotSpotResolvedObjectTypeImpl) resolved;
638 int vtableIndex = getVtableIndex(hotspotResolved);
639 return vtableIndex >= 0 && vtableIndex < hotspotResolved.getVtableLength();
640 }
641 return false;
642 }
643
644 private int getVtableIndex(HotSpotResolvedObjectTypeImpl resolved) {
645 if (!holder.isLinked()) {
646 return config().invalidVtableIndex;
647 }
648 if (holder.isInterface()) {
649 if (resolved.isInterface()) {
650 return config().invalidVtableIndex;
651 }
652 return getVtableIndexForInterfaceMethod(resolved);
653 }
654 return getVtableIndex();
655 }
656
657 /**
658 * Returns this method's virtual table index.
659 *
660 * @return virtual table index
661 */
662 private int getVtableIndex() {
663 assert !holder.isInterface();
664 HotSpotVMConfig config = config();
665 int result = UNSAFE.getInt(metaspaceMethod + config.methodVtableIndexOffset);
666 assert result >= config.nonvirtualVtableIndex : "must be linked";
667 return result;
668 }
669
670 private int getVtableIndexForInterfaceMethod(ResolvedJavaType resolved) {
671 HotSpotResolvedObjectTypeImpl hotspotType = (HotSpotResolvedObjectTypeImpl) resolved;
672 return compilerToVM().getVtableIndexForInterfaceMethod(hotspotType, this);
673 }
674
675 /**
676 * The {@link SpeculationLog} for methods compiled by JVMCI hang off this per-declaring-type
677 * {@link ClassValue}. The raw Method* value is safe to use as a key in the map as a) it is
678 * never moves and b) we never read from it.
679 * <p>
680 * One implication is that we will preserve {@link SpeculationLog}s for methods that have been
681 * redefined via class redefinition. It's tempting to periodically flush such logs but we cannot
682 * read the JVM_ACC_IS_OBSOLETE bit (or anything else) via the raw pointer as obsoleted methods
683 * are subject to clean up and deletion (see InstanceKlass::purge_previous_versions_internal).
684 */
685 private static final ClassValue<Map<Long, SpeculationLog>> SpeculationLogs = new ClassValue<Map<Long, SpeculationLog>>() {
686 @Override
687 protected Map<Long, SpeculationLog> computeValue(java.lang.Class<?> type) {
688 return new HashMap<>(4);
689 }
690 };
691
692 public SpeculationLog getSpeculationLog() {
693 Map<Long, SpeculationLog> map = SpeculationLogs.get(holder.mirror());
694 synchronized (map) {
695 SpeculationLog log = map.get(this.metaspaceMethod);
696 if (log == null) {
697 log = new HotSpotSpeculationLog();
698 map.put(metaspaceMethod, log);
699 }
700 return log;
701 }
702 }
703
704 public int intrinsicId() {
705 HotSpotVMConfig config = config();
706 return UNSAFE.getChar(metaspaceMethod + config.methodIntrinsicIdOffset);
707 }
708
709 public boolean isIntrinsicCandidate() {
710 return (getFlags() & config().methodFlagsIntrinsicCandidate) != 0;
711 }
712
713 /**
714 * Allocates a compile id for this method by asking the VM for one.
715 *
716 * @param entryBCI entry bci
717 * @return compile id
718 */
719 public int allocateCompileId(int entryBCI) {
720 return compilerToVM().allocateCompileId(this, entryBCI);
721 }
722
723 public boolean hasCodeAtLevel(int entryBCI, int level) {
724 if (entryBCI == config().invocationEntryBci) {
725 return hasCompiledCodeAtLevel(level);
726 }
727 return compilerToVM().hasCompiledCodeForOSR(this, entryBCI, level);
728 }
729 }