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