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