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
24 package jdk.vm.ci.hotspot;
25
26 import static jdk.vm.ci.common.InitTimer.timer;
27 import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.runtime;
28
29 import java.lang.reflect.Executable;
30
31 import jdk.vm.ci.code.BytecodeFrame;
32 import jdk.vm.ci.code.InstalledCode;
33 import jdk.vm.ci.code.InvalidInstalledCodeException;
34 import jdk.vm.ci.code.TargetDescription;
35 import jdk.vm.ci.common.InitTimer;
36 import jdk.vm.ci.common.JVMCIError;
37 import jdk.vm.ci.meta.JavaType;
38 import jdk.vm.ci.meta.ResolvedJavaMethod;
39 import jdk.vm.ci.meta.ResolvedJavaType;
40
41 /**
42 * Calls from Java into HotSpot. The behavior of all the methods in this class that take a native
43 * pointer as an argument (e.g., {@link #getSymbol(long)}) is undefined if the argument does not
44 * denote a valid native object.
45 */
46 final class CompilerToVM {
47 /**
48 * Initializes the native part of the JVMCI runtime.
49 */
50 private static native void registerNatives();
51
52 static {
53 initialize();
54 }
55
56 @SuppressWarnings("try")
57 private static void initialize() {
58 try (InitTimer t = timer("CompilerToVM.registerNatives")) {
59 registerNatives();
60 }
61 }
62
63 /**
64 * Gets the {@link CompilerToVM} instance associated with the singleton
65 * {@link HotSpotJVMCIRuntime} instance.
66 */
67 public static CompilerToVM compilerToVM() {
68 return runtime().getCompilerToVM();
69 }
70
71 /**
72 * Copies the original bytecode of {@code method} into a new byte array and returns it.
73 *
74 * @return a new byte array containing the original bytecode of {@code method}
75 */
76 native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
77
78 /**
79 * Gets the number of entries in {@code method}'s exception handler table or 0 if it has no
80 * exception handler table.
81 */
82 native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
83
84 /**
85 * Gets the address of the first entry in {@code method}'s exception handler table.
86 *
87 * Each entry is a native object described by these fields:
88 *
89 * <ul>
90 * <li>{@link HotSpotVMConfig#exceptionTableElementSize}</li>
91 * <li>{@link HotSpotVMConfig#exceptionTableElementStartPcOffset}</li>
92 * <li>{@link HotSpotVMConfig#exceptionTableElementEndPcOffset}</li>
93 * <li>{@link HotSpotVMConfig#exceptionTableElementHandlerPcOffset}</li>
94 * <li>{@link HotSpotVMConfig#exceptionTableElementCatchTypeIndexOffset}
95 * </ul>
96 *
97 * @return 0 if {@code method} has no exception handlers (i.e.
98 * {@code getExceptionTableLength(method) == 0})
99 */
100 native long getExceptionTableStart(HotSpotResolvedJavaMethodImpl method);
101
102 /**
103 * Determines whether {@code method} is currently compilable by the JVMCI compiler being used by
104 * the VM. This can return false if JVMCI compilation failed earlier for {@code method}, a
105 * breakpoint is currently set in {@code method} or {@code method} contains other bytecode
106 * features that require special handling by the VM.
107 */
108 native boolean isCompilable(HotSpotResolvedJavaMethodImpl method);
109
110 /**
111 * Determines if {@code method} is targeted by a VM directive (e.g.,
112 * {@code -XX:CompileCommand=dontinline,<pattern>}) or annotation (e.g.,
113 * {@code jdk.internal.vm.annotation.DontInline}) that specifies it should not be inlined.
114 */
115 native boolean hasNeverInlineDirective(HotSpotResolvedJavaMethodImpl method);
116
117 /**
118 * Determines if {@code method} should be inlined at any cost. This could be because:
119 * <ul>
120 * <li>a CompileOracle directive may forces inlining of this methods</li>
121 * <li>an annotation forces inlining of this method</li>
122 * </ul>
123 */
124 native boolean shouldInlineMethod(HotSpotResolvedJavaMethodImpl method);
125
126 /**
127 * Used to implement {@link ResolvedJavaType#findUniqueConcreteMethod(ResolvedJavaMethod)}.
128 *
129 * @param method the method on which to base the search
130 * @param actualHolderType the best known type of receiver
131 * @return the method result or 0 is there is no unique concrete method for {@code method}
132 */
133 native HotSpotResolvedJavaMethodImpl findUniqueConcreteMethod(HotSpotResolvedObjectTypeImpl actualHolderType, HotSpotResolvedJavaMethodImpl method);
134
135 /**
136 * Gets the implementor for the interface class {@code type}.
137 *
138 * @return the implementor if there is a single implementor, 0 if there is no implementor, or
139 * {@code type} itself if there is more than one implementor
140 */
141 native HotSpotResolvedObjectTypeImpl getImplementor(HotSpotResolvedObjectTypeImpl type);
142
143 /**
144 * Determines if {@code method} is ignored by security stack walks.
145 */
146 native boolean methodIsIgnoredBySecurityStackWalk(HotSpotResolvedJavaMethodImpl method);
147
148 /**
149 * Converts a name to a type.
150 *
151 * @param name a well formed Java type in {@linkplain JavaType#getName() internal} format
152 * @param accessingClass the context of resolution (must not be null)
153 * @param resolve force resolution to a {@link ResolvedJavaType}. If true, this method will
154 * either return a {@link ResolvedJavaType} or throw an exception
155 * @return the type for {@code name} or 0 if resolution failed and {@code resolve == false}
156 * @throws LinkageError if {@code resolve == true} and the resolution failed
157 */
158 native HotSpotResolvedObjectTypeImpl lookupType(String name, Class<?> accessingClass, boolean resolve);
159
160 /**
161 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object.
162 *
163 * The behavior of this method is undefined if {@code cpi} does not denote one of the following
164 * entry types: {@code JVM_CONSTANT_MethodHandle}, {@code JVM_CONSTANT_MethodHandleInError},
165 * {@code JVM_CONSTANT_MethodType} and {@code JVM_CONSTANT_MethodTypeInError}.
166 */
167 native Object resolveConstantInPool(HotSpotConstantPool constantPool, int cpi);
168
169 /**
170 * Resolves the entry at index {@code cpi} in {@code constantPool} to an object, looking in the
171 * constant pool cache first.
172 *
173 * The behavior of this method is undefined if {@code cpi} does not denote a
174 * {@code JVM_CONSTANT_String} entry.
175 */
176 native Object resolvePossiblyCachedConstantInPool(HotSpotConstantPool constantPool, int cpi);
177
178 /**
179 * Gets the {@code JVM_CONSTANT_NameAndType} index from the entry at index {@code cpi} in
180 * {@code constantPool}.
181 *
182 * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
183 * {@code JVM_CONSTANT_NameAndType} index.
184 */
185 native int lookupNameAndTypeRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
186
187 /**
188 * Gets the name of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
189 * denoted by {@code which} in {@code constantPool}.
190 *
191 * The behavior of this method is undefined if {@code which} does not denote a entry that
192 * references a {@code JVM_CONSTANT_NameAndType} entry.
193 */
194 native String lookupNameInPool(HotSpotConstantPool constantPool, int which);
195
196 /**
197 * Gets the signature of the {@code JVM_CONSTANT_NameAndType} entry referenced by another entry
198 * denoted by {@code which} in {@code constantPool}.
199 *
200 * The behavior of this method is undefined if {@code which} does not denote a entry that
201 * references a {@code JVM_CONSTANT_NameAndType} entry.
202 */
203 native String lookupSignatureInPool(HotSpotConstantPool constantPool, int which);
204
205 /**
206 * Gets the {@code JVM_CONSTANT_Class} index from the entry at index {@code cpi} in
207 * {@code constantPool}.
208 *
209 * The behavior of this method is undefined if {@code cpi} does not denote an entry containing a
210 * {@code JVM_CONSTANT_Class} index.
211 */
212 native int lookupKlassRefIndexInPool(HotSpotConstantPool constantPool, int cpi);
213
214 /**
215 * Looks up a class denoted by the {@code JVM_CONSTANT_Class} entry at index {@code cpi} in
216 * {@code constantPool}. This method does not perform any resolution.
217 *
218 * The behavior of this method is undefined if {@code cpi} does not denote a
219 * {@code JVM_CONSTANT_Class} entry.
220 *
221 * @return the resolved class entry or a String otherwise
222 */
223 native Object lookupKlassInPool(HotSpotConstantPool constantPool, int cpi);
224
225 /**
226 * Looks up a method denoted by the entry at index {@code cpi} in {@code constantPool}. This
227 * method does not perform any resolution.
228 *
229 * The behavior of this method is undefined if {@code cpi} does not denote an entry representing
230 * a method.
231 *
232 * @param opcode the opcode of the instruction for which the lookup is being performed or
233 * {@code -1}. If non-negative, then resolution checks specific to the bytecode it
234 * denotes are performed if the method is already resolved. Should any of these
235 * checks fail, 0 is returned.
236 * @return the resolved method entry, 0 otherwise
237 */
238 native HotSpotResolvedJavaMethodImpl lookupMethodInPool(HotSpotConstantPool constantPool, int cpi, byte opcode);
239
240 /**
241 * Ensures that the type referenced by the specified {@code JVM_CONSTANT_InvokeDynamic} entry at
242 * index {@code cpi} in {@code constantPool} is loaded and initialized.
243 *
244 * The behavior of this method is undefined if {@code cpi} does not denote a
245 * {@code JVM_CONSTANT_InvokeDynamic} entry.
246 */
247 native void resolveInvokeDynamicInPool(HotSpotConstantPool constantPool, int cpi);
248
249 /**
250 * If {@code cpi} denotes an entry representing a
251 * <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-2.html#jvms-2.9">signature
252 * polymorphic</a> method, this method ensures that the type referenced by the entry is loaded
253 * and initialized. It {@code cpi} does not denote a signature polymorphic method, this method
254 * does nothing.
255 */
256 native void resolveInvokeHandleInPool(HotSpotConstantPool constantPool, int cpi);
257
258 /**
259 * Gets the list of type names (in the format of {@link JavaType#getName()}) denoting the
260 * classes that define signature polymorphic methods.
261 */
262 native String[] getSignaturePolymorphicHolders();
263
264 /**
265 * Gets the resolved type denoted by the entry at index {@code cpi} in {@code constantPool}.
266 *
267 * The behavior of this method is undefined if {@code cpi} does not denote an entry representing
268 * a class.
269 *
270 * @throws LinkageError if resolution failed
271 */
272 native HotSpotResolvedObjectTypeImpl resolveTypeInPool(HotSpotConstantPool constantPool, int cpi) throws LinkageError;
273
274 /**
275 * Looks up and attempts to resolve the {@code JVM_CONSTANT_Field} entry for at index
276 * {@code cpi} in {@code constantPool}. For some opcodes, checks are performed that require the
277 * {@code method} that contains {@code opcode} to be specified. The values returned in
278 * {@code info} are:
279 *
280 * <pre>
281 * [(int) flags, // only valid if field is resolved
282 * (int) offset] // only valid if field is resolved
283 * </pre>
284 *
285 * The behavior of this method is undefined if {@code cpi} does not denote a
286 * {@code JVM_CONSTANT_Field} entry.
287 *
288 * @param info an array in which the details of the field are returned
289 * @return the type defining the field if resolution is successful, 0 otherwise
290 */
291 native HotSpotResolvedObjectTypeImpl resolveFieldInPool(HotSpotConstantPool constantPool, int cpi, HotSpotResolvedJavaMethodImpl method, byte opcode, long[] info);
292
293 /**
294 * Converts {@code cpci} from an index into the cache for {@code constantPool} to an index
295 * directly into {@code constantPool}.
296 *
297 * The behavior of this method is undefined if {@code ccpi} is an invalid constant pool cache
298 * index.
299 */
300 native int constantPoolRemapInstructionOperandFromCache(HotSpotConstantPool constantPool, int cpci);
301
302 /**
303 * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
304 * {@code constantPool}.
305 */
306 native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
307
308 /**
309 * Installs the result of a compilation into the code cache.
310 *
311 * @param target the target where this code should be installed
312 * @param compiledCode the result of a compilation
313 * @param code the details of the installed CodeBlob are written to this object
314 * @return the outcome of the installation which will be one of
315 * {@link HotSpotVMConfig#codeInstallResultOk},
316 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
317 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
318 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
319 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
320 * @throws JVMCIError if there is something wrong with the compiled code or the associated
321 * metadata.
322 */
323 native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, HotSpotSpeculationLog speculationLog);
324
325 /**
326 * Generates the VM metadata for some compiled code and copies them into {@code metaData}. This
327 * method does not install anything into the code cache.
328 *
329 * @param target the target where this code would be installed
330 * @param compiledCode the result of a compilation
331 * @param metaData the metadata is written to this object
332 * @return the outcome of the installation which will be one of
333 * {@link HotSpotVMConfig#codeInstallResultOk},
334 * {@link HotSpotVMConfig#codeInstallResultCacheFull},
335 * {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
336 * {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
337 * {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
338 * @throws JVMCIError if there is something wrong with the compiled code or the metadata
339 */
340 native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
341
342 /**
343 * Resets all compilation statistics.
344 */
345 native void resetCompilationStatistics();
346
347 /**
348 * Reads the database of VM info. The return value encodes the info in a nested object array
349 * that is described by the pseudo Java object {@code info} below:
350 *
351 * <pre>
352 * info = [
353 * VMField[] vmFields,
354 * [String name, Long size, ...] vmTypeSizes,
355 * [String name, Long value, ...] vmConstants,
356 * [String name, Long value, ...] vmAddresses,
357 * VMFlag[] vmFlags
358 * VMIntrinsicMethod[] vmIntrinsics
359 * ]
360 * </pre>
361 *
362 * @return VM info as encoded above
363 */
364 native Object[] readConfiguration();
365
366 /**
367 * Resolves the implementation of {@code method} for virtual dispatches on objects of dynamic
368 * type {@code exactReceiver}. This resolution process only searches "up" the class hierarchy of
369 * {@code exactReceiver}.
370 *
371 * @param caller the caller or context type used to perform access checks
372 * @return the link-time resolved method (might be abstract) or {@code null} if it is either a
373 * signature polymorphic method or can not be linked.
374 */
375 native HotSpotResolvedJavaMethodImpl resolveMethod(HotSpotResolvedObjectTypeImpl exactReceiver, HotSpotResolvedJavaMethodImpl method, HotSpotResolvedObjectTypeImpl caller);
376
377 /**
378 * Gets the static initializer of {@code type}.
379 *
380 * @return 0 if {@code type} has no static initializer
381 */
382 native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
383
384 /**
385 * Determines if {@code type} or any of its currently loaded subclasses overrides
386 * {@code Object.finalize()}.
387 */
388 native boolean hasFinalizableSubclass(HotSpotResolvedObjectTypeImpl type);
389
390 /**
391 * Gets the method corresponding to {@code executable}.
392 */
393 native HotSpotResolvedJavaMethodImpl asResolvedJavaMethod(Executable executable);
394
395 /**
396 * Gets the maximum absolute offset of a PC relative call to {@code address} from any position
397 * in the code cache.
398 *
399 * @param address an address that may be called from any code in the code cache
400 * @return -1 if {@code address == 0}
401 */
402 native long getMaxCallTargetOffset(long address);
403
404 /**
405 * Gets a textual disassembly of {@code codeBlob}.
406 *
407 * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
408 * {@code codeBlob} could not be disassembled for some reason
409 */
410 // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
411 synchronized native String disassembleCodeBlob(InstalledCode installedCode);
412
413 /**
414 * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
415 */
416 native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
417
418 /**
419 * Executes some {@code installedCode} with arguments {@code args}.
420 *
421 * @return the result of executing {@code installedCode}
422 * @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
423 */
424 native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
425
426 /**
427 * Gets the line number table for {@code method}. The line number table is encoded as (bci,
428 * source line number) pairs.
429 *
430 * @return the line number table for {@code method} or null if it doesn't have one
431 */
432 native long[] getLineNumberTable(HotSpotResolvedJavaMethodImpl method);
433
434 /**
435 * Gets the number of entries in the local variable table for {@code method}.
436 *
437 * @return the number of entries in the local variable table for {@code method}
438 */
439 native int getLocalVariableTableLength(HotSpotResolvedJavaMethodImpl method);
440
441 /**
442 * Gets the address of the first entry in the local variable table for {@code method}.
443 *
444 * Each entry is a native object described by these fields:
445 *
446 * <ul>
447 * <li>{@link HotSpotVMConfig#localVariableTableElementSize}</li>
448 * <li>{@link HotSpotVMConfig#localVariableTableElementLengthOffset}</li>
449 * <li>{@link HotSpotVMConfig#localVariableTableElementNameCpIndexOffset}</li>
450 * <li>{@link HotSpotVMConfig#localVariableTableElementDescriptorCpIndexOffset}</li>
451 * <li>{@link HotSpotVMConfig#localVariableTableElementSlotOffset}
452 * <li>{@link HotSpotVMConfig#localVariableTableElementStartBciOffset}
453 * </ul>
454 *
455 * @return 0 if {@code method} does not have a local variable table
456 */
457 native long getLocalVariableTableStart(HotSpotResolvedJavaMethodImpl method);
458
459 /**
460 * Determines if {@code method} should not be inlined or compiled.
461 */
462 native void doNotInlineOrCompile(HotSpotResolvedJavaMethodImpl method);
463
464 /**
465 * Invalidates the profiling information for {@code method} and (re)initializes it such that
466 * profiling restarts upon its next invocation.
467 */
468 native void reprofile(HotSpotResolvedJavaMethodImpl method);
469
470 /**
471 * Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
472 * raised the next time {@code installedCode} is executed.
473 */
474 native void invalidateInstalledCode(InstalledCode installedCode);
475
476 /**
477 * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
478 */
479 native long[] collectCounters();
480
481 /**
482 * Determines if {@code metaspaceMethodData} is mature.
483 */
484 native boolean isMature(long metaspaceMethodData);
485
486 /**
487 * Generate a unique id to identify the result of the compile.
488 */
489 native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
490
491 /**
492 * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
493 * compilation level {@code level}.
494 */
495 native boolean hasCompiledCodeForOSR(HotSpotResolvedJavaMethodImpl method, int entryBCI, int level);
496
497 /**
498 * Gets the value of {@code metaspaceSymbol} as a String.
499 */
500 native String getSymbol(long metaspaceSymbol);
501
502 /**
503 * Looks for the next Java stack frame matching an entry in {@code methods}.
504 *
505 * @param frame the starting point of the search, where {@code null} refers to the topmost frame
506 * @param methods the methods to look for, where {@code null} means that any frame is returned
507 * @return the frame, or {@code null} if the end of the stack was reached during the search
508 */
509 native HotSpotStackFrameReference getNextStackFrame(HotSpotStackFrameReference frame, ResolvedJavaMethod[] methods, int initialSkip);
510
511 /**
512 * Materializes all virtual objects within {@code stackFrame} and updates its locals.
513 *
514 * @param invalidate if {@code true}, the compiled method for the stack frame will be
515 * invalidated
516 */
517 native void materializeVirtualObjects(HotSpotStackFrameReference stackFrame, boolean invalidate);
518
519 /**
520 * Gets the v-table index for interface method {@code method} in the receiver {@code type} or
521 * {@link HotSpotVMConfig#invalidVtableIndex} if {@code method} is not in {@code type}'s
522 * v-table.
523 *
524 * @throws InternalError if {@code type} is an interface or {@code method} is not held by an
525 * interface or class represented by {@code type} is not initialized
526 */
527 native int getVtableIndexForInterfaceMethod(HotSpotResolvedObjectTypeImpl type, HotSpotResolvedJavaMethodImpl method);
528
529 /**
530 * Determines if debug info should also be emitted at non-safepoint locations.
531 */
532 native boolean shouldDebugNonSafepoints();
533
534 /**
535 * Writes {@code length} bytes from {@code bytes} starting at offset {@code offset} to the
536 * HotSpot's log stream.
537 *
538 * @exception NullPointerException if {@code bytes == null}
539 * @exception IndexOutOfBoundsException if copying would cause access of data outside array
540 * bounds
541 */
542 native void writeDebugOutput(byte[] bytes, int offset, int length);
543
544 /**
545 * Flush HotSpot's log stream.
546 */
547 native void flushDebugOutput();
548
549 /**
550 * Read a HotSpot Method* value from the memory location described by {@code base} plus
551 * {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
552 * method does no checking that the memory location actually contains a valid pointer and may
553 * crash the VM if an invalid location is provided. If the {@code base} is null then
554 * {@code displacement} is used by itself. If {@code base} is a
555 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
556 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
557 * and added to {@code displacement}. Any other non-null object type causes an
558 * {@link IllegalArgumentException} to be thrown.
559 *
560 * @param base an object to read from or null
561 * @param displacement
562 * @return null or the resolved method for this location
563 */
564 native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
565
566 /**
567 * Gets the {@code ConstantPool*} associated with {@code object} and returns a
568 * {@link HotSpotConstantPool} wrapping it.
569 *
570 * @param object a {@link HotSpotResolvedJavaMethodImpl} or
571 * {@link HotSpotResolvedObjectTypeImpl} object
572 * @return a {@link HotSpotConstantPool} wrapping the {@code ConstantPool*} associated with
573 * {@code object}
574 * @throws NullPointerException if {@code object == null}
575 * @throws IllegalArgumentException if {@code object} is neither a
576 * {@link HotSpotResolvedJavaMethodImpl} nor a {@link HotSpotResolvedObjectTypeImpl}
577 */
578 native HotSpotConstantPool getConstantPool(Object object);
579
580 /**
581 * Read a HotSpot Klass* value from the memory location described by {@code base} plus
582 * {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
583 * method does no checking that the memory location actually contains a valid pointer and may
584 * crash the VM if an invalid location is provided. If the {@code base} is null then
585 * {@code displacement} is used by itself. If {@code base} is a
586 * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
587 * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
588 * and added to {@code displacement}. Any other non-null object type causes an
589 * {@link IllegalArgumentException} to be thrown.
590 *
591 * @param base an object to read from or null
592 * @param displacement
593 * @param compressed true if the location contains a compressed Klass*
594 * @return null or the resolved method for this location
595 */
596 native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);
597
598 /**
599 * Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
600 * {@code position} is outside the space of the MethodData then an
601 * {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
602 * isn't pointing at a valid ProfileData will crash the VM.
603 *
604 * @param metaspaceMethodData
605 * @param position
606 * @return the size of the ProfileData item pointed at by {@code position}
607 * @throws IllegalArgumentException if an out of range position is given
608 */
609 native int methodDataProfileDataSize(long metaspaceMethodData, int position);
610
611 /**
612 * Gets the fingerprint for a given Klass*
613 *
614 * @param metaspaceKlass
615 * @return the value of the fingerprint (zero for arrays and synthetic classes).
616 */
617 native long getFingerprint(long metaspaceKlass);
618
619 /**
620 * Return the amount of native stack required for the interpreter frames represented by
621 * {@code frame}. This is used when emitting the stack banging code to ensure that there is
622 * enough space for the frames during deoptimization.
623 *
624 * @param frame
625 * @return the number of bytes required for deoptimization of this frame state
626 */
627 native int interpreterFrameSize(BytecodeFrame frame);
628
629 /**
630 * Invokes non-public method {@code java.lang.invoke.LambdaForm.compileToBytecode()} on
631 * {@code lambdaForm} (which must be a {@code java.lang.invoke.LambdaForm} instance).
632 */
633 native void compileToBytecode(Object lambdaForm);
634 }