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src/jdk.vm.ci/share/classes/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/CompilerToVM.java

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   1 /*
   2  * Copyright (c) 2011, 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.inittimer.InitTimer.timer;
  27 
  28 import java.lang.reflect.Constructor;
  29 import java.lang.reflect.Method;
  30 
  31 import jdk.vm.ci.code.InstalledCode;
  32 import jdk.vm.ci.code.InvalidInstalledCodeException;
  33 import jdk.vm.ci.code.TargetDescription;
  34 import jdk.vm.ci.hotspotvmconfig.HotSpotVMField;
  35 import jdk.vm.ci.inittimer.InitTimer;
  36 import jdk.vm.ci.meta.JavaType;
  37 import jdk.vm.ci.meta.ResolvedJavaMethod;
  38 import jdk.vm.ci.meta.ResolvedJavaType;
  39 import jdk.vm.ci.meta.SpeculationLog;
  40 import sun.misc.Unsafe;
  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 public 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      * Copies the original bytecode of {@code method} into a new byte array and returns it.
  66      *
  67      * @return a new byte array containing the original bytecode of {@code method}
  68      */
  69     native byte[] getBytecode(HotSpotResolvedJavaMethodImpl method);
  70 
  71     /**
  72      * Gets the number of entries in {@code method}'s exception handler table or 0 if it has not
  73      * exception handler table.
  74      */
  75     native int getExceptionTableLength(HotSpotResolvedJavaMethodImpl method);
  76 
  77     /**
  78      * Gets the address of the first entry in {@code method}'s exception handler table.
  79      *
  80      * Each entry is a native object described by these fields:
  81      *
  82      * <ul>
  83      * <li>{@link HotSpotVMConfig#exceptionTableElementSize}</li>
  84      * <li>{@link HotSpotVMConfig#exceptionTableElementStartPcOffset}</li>


 284 
 285     /**
 286      * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
 287      * {@code constantPool}.
 288      */
 289     native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
 290 
 291     /**
 292      * Installs the result of a compilation into the code cache.
 293      *
 294      * @param target the target where this code should be installed
 295      * @param compiledCode the result of a compilation
 296      * @param code the details of the installed CodeBlob are written to this object
 297      * @return the outcome of the installation which will be one of
 298      *         {@link HotSpotVMConfig#codeInstallResultOk},
 299      *         {@link HotSpotVMConfig#codeInstallResultCacheFull},
 300      *         {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
 301      *         {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
 302      *         {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
 303      */
 304     public native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, SpeculationLog speculationLog);
 305 
 306     public native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
 307 
 308     /**
 309      * Notifies the VM of statistics for a completed compilation.
 310      *
 311      * @param id the identifier of the compilation
 312      * @param method the method compiled
 313      * @param osr specifies if the compilation was for on-stack-replacement
 314      * @param processedBytecodes the number of bytecodes processed during the compilation, including
 315      *            the bytecodes of all inlined methods
 316      * @param time the amount time spent compiling {@code method}
 317      * @param timeUnitsPerSecond the granularity of the units for the {@code time} value
 318      * @param installedCode the nmethod installed as a result of the compilation
 319      */
 320     public synchronized native void notifyCompilationStatistics(int id, HotSpotResolvedJavaMethodImpl method, boolean osr, int processedBytecodes, long time, long timeUnitsPerSecond,
 321                     InstalledCode installedCode);
 322 
 323     /**
 324      * Resets all compilation statistics.
 325      */
 326     public native void resetCompilationStatistics();
 327 
 328     /**
 329      * Initializes the fields of {@code config}.
 330      */
 331     native long initializeConfiguration();
 332 
 333     /**
 334      * Resolves the implementation of {@code method} for virtual dispatches on objects of dynamic
 335      * type {@code exactReceiver}. This resolution process only searches "up" the class hierarchy of
 336      * {@code exactReceiver}.
 337      *
 338      * @param caller the caller or context type used to perform access checks
 339      * @return the link-time resolved method (might be abstract) or {@code 0} if it can not be
 340      *         linked
 341      */
 342     native HotSpotResolvedJavaMethodImpl resolveMethod(HotSpotResolvedObjectTypeImpl exactReceiver, HotSpotResolvedJavaMethodImpl method, HotSpotResolvedObjectTypeImpl caller);
 343 
 344     /**
 345      * Gets the static initializer of {@code type}.
 346      *
 347      * @return 0 if {@code type} has no static initializer
 348      */
 349     native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
 350 
 351     /**
 352      * Determines if {@code type} or any of its currently loaded subclasses overrides
 353      * {@code Object.finalize()}.
 354      */
 355     native boolean hasFinalizableSubclass(HotSpotResolvedObjectTypeImpl type);
 356 
 357     /**
 358      * Gets the method corresponding to {@code holder} and slot number {@code slot} (i.e.
 359      * {@link Method#slot} or {@link Constructor#slot}).
 360      */
 361     native HotSpotResolvedJavaMethodImpl getResolvedJavaMethodAtSlot(Class<?> holder, int slot);
 362 
 363     /**
 364      * Gets the maximum absolute offset of a PC relative call to {@code address} from any position
 365      * in the code cache.
 366      *
 367      * @param address an address that may be called from any code in the code cache
 368      * @return -1 if {@code address == 0}
 369      */
 370     public native long getMaxCallTargetOffset(long address);
 371 
 372     /**
 373      * Gets a textual disassembly of {@code codeBlob}.
 374      *
 375      * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
 376      *         {@code codeBlob} could not be disassembled for some reason
 377      */
 378     // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
 379     public synchronized native String disassembleCodeBlob(long codeBlob);
 380 
 381     /**
 382      * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
 383      */
 384     native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
 385 
 386     /**
 387      * Executes some {@code installedCode} with arguments {@code args}.
 388      *
 389      * @return the result of executing {@code installedCode}
 390      * @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
 391      */
 392     native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
 393 
 394     /**
 395      * Gets the line number table for {@code method}. The line number table is encoded as (bci,
 396      * source line number) pairs.
 397      *
 398      * @return the line number table for {@code method} or null if it doesn't have one
 399      */


 437      *
 438      * @param address address of an oop field within a VM data structure
 439      */
 440     native Object readUncompressedOop(long address);
 441 
 442     /**
 443      * Determines if {@code method} should not be inlined or compiled.
 444      */
 445     native void doNotInlineOrCompile(HotSpotResolvedJavaMethodImpl method);
 446 
 447     /**
 448      * Invalidates the profiling information for {@code method} and (re)initializes it such that
 449      * profiling restarts upon its next invocation.
 450      */
 451     native void reprofile(HotSpotResolvedJavaMethodImpl method);
 452 
 453     /**
 454      * Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
 455      * raised the next time {@code installedCode} is executed.
 456      */
 457     public native void invalidateInstalledCode(InstalledCode installedCode);
 458 
 459     /**
 460      * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
 461      */
 462     public native long[] collectCounters();
 463 
 464     /**
 465      * Determines if {@code metaspaceMethodData} is mature.
 466      */
 467     native boolean isMature(long metaspaceMethodData);
 468 
 469     /**
 470      * Generate a unique id to identify the result of the compile.
 471      */
 472     native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
 473 
 474     /**
 475      * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
 476      * compilation level {@code level}.
 477      */
 478     native boolean hasCompiledCodeForOSR(HotSpotResolvedJavaMethodImpl method, int entryBCI, int level);
 479 
 480     /**
 481      * Gets the value of {@code metaspaceSymbol} as a String.
 482      */
 483     native String getSymbol(long metaspaceSymbol);
 484 
 485     /**
 486      * Looks for the next Java stack frame matching an entry in {@code methods}.
 487      *
 488      * @param frame the starting point of the search, where {@code null} refers to the topmost frame
 489      * @param methods the methods to look for, where {@code null} means that any frame is returned
 490      * @return the frame, or {@code null} if the end of the stack was reached during the search
 491      */
 492     public native HotSpotStackFrameReference getNextStackFrame(HotSpotStackFrameReference frame, HotSpotResolvedJavaMethodImpl[] methods, int initialSkip);
 493 
 494     /**
 495      * Materializes all virtual objects within {@code stackFrame} updates its locals.
 496      *
 497      * @param invalidate if {@code true}, the compiled method for the stack frame will be
 498      *            invalidated.
 499      */
 500     native void materializeVirtualObjects(HotSpotStackFrameReference stackFrame, boolean invalidate);
 501 
 502     /**
 503      * Gets the v-table index for interface method {@code method} in the receiver {@code type} or
 504      * {@link HotSpotVMConfig#invalidVtableIndex} if {@code method} is not in {@code type}'s
 505      * v-table.
 506      *
 507      * @throws InternalError if {@code type} is an interface or {@code method} is not held by an
 508      *             interface or class represented by {@code type} is not initialized
 509      */
 510     native int getVtableIndexForInterfaceMethod(HotSpotResolvedObjectTypeImpl type, HotSpotResolvedJavaMethodImpl method);
 511 
 512     /**
 513      * Determines if debug info should also be emitted at non-safepoint locations.
 514      */
 515     public native boolean shouldDebugNonSafepoints();

 516 
 517     /**
 518      * Writes {@code length} bytes from {@code bytes} starting at offset {@code offset} to the
 519      * HotSpot's log stream.
 520      *
 521      * @exception NullPointerException if <code>bytes</code> is <code>null</code>.
 522      * @exception IndexOutOfBoundsException if copying would cause access of data outside array
 523      *                bounds.
 524      */
 525     public native void writeDebugOutput(byte[] bytes, int offset, int length);
 526 
 527     /**
 528      * Flush HotSpot's log stream.
 529      */
 530     public native void flushDebugOutput();
 531 
 532     /**
 533      * Read a value representing a metaspace Method* and return the
 534      * {@link HotSpotResolvedJavaMethodImpl} wrapping it. This method does no checking that the
 535      * location actually contains a valid Method*. If the {@code base} object is a


 536      * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
 537      * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
 538      * and used as the base. Otherwise the object itself is used as the base.

 539      *
 540      * @param base an object to read from or null
 541      * @param displacement
 542      * @return null or the resolved method for this location
 543      */
 544     native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
 545 
 546     /**
 547      * Read a value representing a metaspace ConstantPool* and return the
 548      * {@link HotSpotConstantPool} wrapping it. This method does no checking that the location
 549      * actually contains a valid ConstantPool*. If the {@code base} object is a
 550      * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
 551      * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
 552      * and used as the base. Otherwise the object itself is used as the base.


 553      *
 554      * @param base an object to read from or null
 555      * @param displacement
 556      * @return null or the resolved method for this location
 557      */
 558     native HotSpotConstantPool getConstantPool(Object base, long displacement);
 559 
 560     /**
 561      * Read a value representing a metaspace Klass* and return the
 562      * {@link HotSpotResolvedObjectTypeImpl} wrapping it. The method does no checking that the
 563      * location actually contains a valid Klass*. If the {@code base} object is a


 564      * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
 565      * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
 566      * and used as the base. Otherwise the object itself is used as the base.

 567      *
 568      * @param base an object to read from or null
 569      * @param displacement
 570      * @param compressed true if the location contains a compressed Klass*
 571      * @return null or the resolved method for this location
 572      */
 573     native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);













 574 }
   1 /*
   2  * Copyright (c) 2011, 2015, 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.hotspot.HotSpotJVMCIRuntime.runtime;
  27 import static jdk.vm.ci.inittimer.InitTimer.timer;
  28 
  29 import java.lang.reflect.Constructor;
  30 import java.lang.reflect.Method;
  31 
  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.hotspotvmconfig.HotSpotVMField;
  36 import jdk.vm.ci.inittimer.InitTimer;
  37 import jdk.vm.ci.meta.JavaType;
  38 import jdk.vm.ci.meta.ResolvedJavaMethod;
  39 import jdk.vm.ci.meta.ResolvedJavaType;

  40 import sun.misc.Unsafe;
  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 not
  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>


 292 
 293     /**
 294      * Gets the appendix object (if any) associated with the entry at index {@code cpi} in
 295      * {@code constantPool}.
 296      */
 297     native Object lookupAppendixInPool(HotSpotConstantPool constantPool, int cpi);
 298 
 299     /**
 300      * Installs the result of a compilation into the code cache.
 301      *
 302      * @param target the target where this code should be installed
 303      * @param compiledCode the result of a compilation
 304      * @param code the details of the installed CodeBlob are written to this object
 305      * @return the outcome of the installation which will be one of
 306      *         {@link HotSpotVMConfig#codeInstallResultOk},
 307      *         {@link HotSpotVMConfig#codeInstallResultCacheFull},
 308      *         {@link HotSpotVMConfig#codeInstallResultCodeTooLarge},
 309      *         {@link HotSpotVMConfig#codeInstallResultDependenciesFailed} or
 310      *         {@link HotSpotVMConfig#codeInstallResultDependenciesInvalid}.
 311      */
 312     native int installCode(TargetDescription target, HotSpotCompiledCode compiledCode, InstalledCode code, HotSpotSpeculationLog speculationLog);
 313 
 314     public native int getMetadata(TargetDescription target, HotSpotCompiledCode compiledCode, HotSpotMetaData metaData);
 315 
 316     /**
 317      * Notifies the VM of statistics for a completed compilation.
 318      *
 319      * @param id the identifier of the compilation
 320      * @param method the method compiled
 321      * @param osr specifies if the compilation was for on-stack-replacement
 322      * @param processedBytecodes the number of bytecodes processed during the compilation, including
 323      *            the bytecodes of all inlined methods
 324      * @param time the amount time spent compiling {@code method}
 325      * @param timeUnitsPerSecond the granularity of the units for the {@code time} value
 326      * @param installedCode the nmethod installed as a result of the compilation
 327      */
 328     synchronized native void notifyCompilationStatistics(int id, HotSpotResolvedJavaMethodImpl method, boolean osr, int processedBytecodes, long time, long timeUnitsPerSecond,
 329                     InstalledCode installedCode);
 330 
 331     /**
 332      * Resets all compilation statistics.
 333      */
 334     native void resetCompilationStatistics();
 335 
 336     /**
 337      * Initializes the fields of {@code config}.
 338      */
 339     native long initializeConfiguration(HotSpotVMConfig config);
 340 
 341     /**
 342      * Resolves the implementation of {@code method} for virtual dispatches on objects of dynamic
 343      * type {@code exactReceiver}. This resolution process only searches "up" the class hierarchy of
 344      * {@code exactReceiver}.
 345      *
 346      * @param caller the caller or context type used to perform access checks
 347      * @return the link-time resolved method (might be abstract) or {@code 0} if it can not be
 348      *         linked
 349      */
 350     native HotSpotResolvedJavaMethodImpl resolveMethod(HotSpotResolvedObjectTypeImpl exactReceiver, HotSpotResolvedJavaMethodImpl method, HotSpotResolvedObjectTypeImpl caller);
 351 
 352     /**
 353      * Gets the static initializer of {@code type}.
 354      *
 355      * @return 0 if {@code type} has no static initializer
 356      */
 357     native HotSpotResolvedJavaMethodImpl getClassInitializer(HotSpotResolvedObjectTypeImpl type);
 358 
 359     /**
 360      * Determines if {@code type} or any of its currently loaded subclasses overrides
 361      * {@code Object.finalize()}.
 362      */
 363     native boolean hasFinalizableSubclass(HotSpotResolvedObjectTypeImpl type);
 364 
 365     /**
 366      * Gets the method corresponding to {@code holder} and slot number {@code slot} (i.e.
 367      * {@link Method#slot} or {@link Constructor#slot}).
 368      */
 369     native HotSpotResolvedJavaMethodImpl getResolvedJavaMethodAtSlot(Class<?> holder, int slot);
 370 
 371     /**
 372      * Gets the maximum absolute offset of a PC relative call to {@code address} from any position
 373      * in the code cache.
 374      *
 375      * @param address an address that may be called from any code in the code cache
 376      * @return -1 if {@code address == 0}
 377      */
 378     native long getMaxCallTargetOffset(long address);
 379 
 380     /**
 381      * Gets a textual disassembly of {@code codeBlob}.
 382      *
 383      * @return a non-zero length string containing a disassembly of {@code codeBlob} or null if
 384      *         {@code codeBlob} could not be disassembled for some reason
 385      */
 386     // The HotSpot disassembler seems not to be thread safe so it's better to synchronize its usage
 387     synchronized native String disassembleCodeBlob(InstalledCode installedCode);
 388 
 389     /**
 390      * Gets a stack trace element for {@code method} at bytecode index {@code bci}.
 391      */
 392     native StackTraceElement getStackTraceElement(HotSpotResolvedJavaMethodImpl method, int bci);
 393 
 394     /**
 395      * Executes some {@code installedCode} with arguments {@code args}.
 396      *
 397      * @return the result of executing {@code installedCode}
 398      * @throws InvalidInstalledCodeException if {@code installedCode} has been invalidated
 399      */
 400     native Object executeInstalledCode(Object[] args, InstalledCode installedCode) throws InvalidInstalledCodeException;
 401 
 402     /**
 403      * Gets the line number table for {@code method}. The line number table is encoded as (bci,
 404      * source line number) pairs.
 405      *
 406      * @return the line number table for {@code method} or null if it doesn't have one
 407      */


 445      *
 446      * @param address address of an oop field within a VM data structure
 447      */
 448     native Object readUncompressedOop(long address);
 449 
 450     /**
 451      * Determines if {@code method} should not be inlined or compiled.
 452      */
 453     native void doNotInlineOrCompile(HotSpotResolvedJavaMethodImpl method);
 454 
 455     /**
 456      * Invalidates the profiling information for {@code method} and (re)initializes it such that
 457      * profiling restarts upon its next invocation.
 458      */
 459     native void reprofile(HotSpotResolvedJavaMethodImpl method);
 460 
 461     /**
 462      * Invalidates {@code installedCode} such that {@link InvalidInstalledCodeException} will be
 463      * raised the next time {@code installedCode} is executed.
 464      */
 465     native void invalidateInstalledCode(InstalledCode installedCode);
 466 
 467     /**
 468      * Collects the current values of all JVMCI benchmark counters, summed up over all threads.
 469      */
 470     native long[] collectCounters();
 471 
 472     /**
 473      * Determines if {@code metaspaceMethodData} is mature.
 474      */
 475     native boolean isMature(long metaspaceMethodData);
 476 
 477     /**
 478      * Generate a unique id to identify the result of the compile.
 479      */
 480     native int allocateCompileId(HotSpotResolvedJavaMethodImpl method, int entryBCI);
 481 
 482     /**
 483      * Determines if {@code method} has OSR compiled code identified by {@code entryBCI} for
 484      * compilation level {@code level}.
 485      */
 486     native boolean hasCompiledCodeForOSR(HotSpotResolvedJavaMethodImpl method, int entryBCI, int level);
 487 
 488     /**
 489      * Gets the value of {@code metaspaceSymbol} as a String.
 490      */
 491     native String getSymbol(long metaspaceSymbol);
 492 
 493     /**
 494      * Looks for the next Java stack frame matching an entry in {@code methods}.
 495      *
 496      * @param frame the starting point of the search, where {@code null} refers to the topmost frame
 497      * @param methods the methods to look for, where {@code null} means that any frame is returned
 498      * @return the frame, or {@code null} if the end of the stack was reached during the search
 499      */
 500     native HotSpotStackFrameReference getNextStackFrame(HotSpotStackFrameReference frame, ResolvedJavaMethod[] methods, int initialSkip);
 501 
 502     /**
 503      * Materializes all virtual objects within {@code stackFrame} updates its locals.
 504      *
 505      * @param invalidate if {@code true}, the compiled method for the stack frame will be
 506      *            invalidated.
 507      */
 508     native void materializeVirtualObjects(HotSpotStackFrameReference stackFrame, boolean invalidate);
 509 
 510     /**
 511      * Gets the v-table index for interface method {@code method} in the receiver {@code type} or
 512      * {@link HotSpotVMConfig#invalidVtableIndex} if {@code method} is not in {@code type}'s
 513      * v-table.
 514      *
 515      * @throws InternalError if {@code type} is an interface or {@code method} is not held by an
 516      *             interface or class represented by {@code type} is not initialized
 517      */
 518     native int getVtableIndexForInterfaceMethod(HotSpotResolvedObjectTypeImpl type, HotSpotResolvedJavaMethodImpl method);
 519 
 520     /**
 521      * Determines if debug info should also be emitted at non-safepoint locations.
 522      */
 523 
 524     native boolean shouldDebugNonSafepoints();
 525 
 526     /**
 527      * Writes {@code length} bytes from {@code bytes} starting at offset {@code offset} to the
 528      * HotSpot's log stream.
 529      *
 530      * @exception NullPointerException if {@code bytes == null}
 531      * @exception IndexOutOfBoundsException if copying would cause access of data outside array
 532      *                bounds
 533      */
 534     native void writeDebugOutput(byte[] bytes, int offset, int length);
 535 
 536     /**
 537      * Flush HotSpot's log stream.
 538      */
 539     native void flushDebugOutput();
 540 
 541     /**
 542      * Read a HotSpot Method* value from the memory location described by {@code base} plus
 543      * {@code displacement} and return the {@link HotSpotResolvedJavaMethodImpl} wrapping it. This
 544      * method does no checking that the memory location actually contains a valid pointer and may
 545      * crash the VM if an invalid location is provided. If the {@code base} is null then
 546      * {@code displacement} is used by itself. If {@code base} is a
 547      * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
 548      * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
 549      * and added to {@code displacement}. Any other non-null object type causes an
 550      * {@link IllegalArgumentException} to be thrown.
 551      *
 552      * @param base an object to read from or null
 553      * @param displacement
 554      * @return null or the resolved method for this location
 555      */
 556     native HotSpotResolvedJavaMethodImpl getResolvedJavaMethod(Object base, long displacement);
 557 
 558     /**
 559      * Read a HotSpot ConstantPool* value from the memory location described by {@code base} plus
 560      * {@code displacement} and return the {@link HotSpotConstantPool} wrapping it. This method does
 561      * no checking that the memory location actually contains a valid pointer and may crash the VM
 562      * if an invalid location is provided. If the {@code base} is null then {@code displacement} is
 563      * used by itself. If {@code base} is a {@link HotSpotResolvedJavaMethodImpl},
 564      * {@link HotSpotConstantPool} or {@link HotSpotResolvedObjectTypeImpl} then the metaspace
 565      * pointer is fetched from that object and added to {@code displacement}. Any other non-null
 566      * object type causes an {@link IllegalArgumentException} to be thrown.
 567      *
 568      * @param base an object to read from or null
 569      * @param displacement
 570      * @return null or the resolved method for this location
 571      */
 572     native HotSpotConstantPool getConstantPool(Object base, long displacement);
 573 
 574     /**
 575      * Read a HotSpot Klass* value from the memory location described by {@code base} plus
 576      * {@code displacement} and return the {@link HotSpotResolvedObjectTypeImpl} wrapping it. This
 577      * method does no checking that the memory location actually contains a valid pointer and may
 578      * crash the VM if an invalid location is provided. If the {@code base} is null then
 579      * {@code displacement} is used by itself. If {@code base} is a
 580      * {@link HotSpotResolvedJavaMethodImpl}, {@link HotSpotConstantPool} or
 581      * {@link HotSpotResolvedObjectTypeImpl} then the metaspace pointer is fetched from that object
 582      * and added to {@code displacement}. Any other non-null object type causes an
 583      * {@link IllegalArgumentException} to be thrown.
 584      *
 585      * @param base an object to read from or null
 586      * @param displacement
 587      * @param compressed true if the location contains a compressed Klass*
 588      * @return null or the resolved method for this location
 589      */
 590     native HotSpotResolvedObjectTypeImpl getResolvedJavaType(Object base, long displacement, boolean compressed);
 591 
 592     /**
 593      * Return the size of the HotSpot ProfileData* pointed at by {@code position}. If
 594      * {@code position} is outside the space of the MethodData then an
 595      * {@link IllegalArgumentException} is thrown. A {@code position} inside the MethodData but that
 596      * isn't pointing at a valid ProfileData will crash the VM.
 597      *
 598      * @param metaspaceMethodData
 599      * @param position
 600      * @return the size of the ProfileData item pointed at by {@code position}
 601      * @throws IllegalArgumentException if an out of range position is given
 602      */
 603     native int methodDataProfileDataSize(long metaspaceMethodData, int position);
 604 }
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