1 /*
   2  * Copyright (c) 2012, 2023, 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 
  25 #include "precompiled.hpp"
  26 #include "cds.h"
  27 #include "cds/archiveHeapLoader.hpp"
  28 #include "cds/cdsConstants.hpp"
  29 #include "cds/filemap.hpp"
  30 #include "cds/heapShared.hpp"
  31 #include "cds/metaspaceShared.hpp"
  32 #include "classfile/classLoaderDataGraph.hpp"
  33 #include "classfile/classLoaderStats.hpp"
  34 #include "classfile/javaClasses.inline.hpp"
  35 #include "classfile/modules.hpp"
  36 #include "classfile/protectionDomainCache.hpp"
  37 #include "classfile/stringTable.hpp"
  38 #include "classfile/symbolTable.hpp"
  39 #include "classfile/systemDictionary.hpp"
  40 #include "classfile/vmSymbols.hpp"
  41 #include "code/codeCache.hpp"
  42 #include "compiler/compilationPolicy.hpp"
  43 #include "compiler/directivesParser.hpp"
  44 #include "compiler/methodMatcher.hpp"
  45 #include "gc/shared/concurrentGCBreakpoints.hpp"
  46 #include "gc/shared/gcConfig.hpp"
  47 #include "gc/shared/gcLocker.inline.hpp"
  48 #include "gc/shared/genArguments.hpp"
  49 #include "gc/shared/genCollectedHeap.hpp"
  50 #include "jvmtifiles/jvmtiEnv.hpp"
  51 #include "logging/log.hpp"
  52 #include "memory/iterator.hpp"
  53 #include "memory/metadataFactory.hpp"
  54 #include "memory/metaspace/testHelpers.hpp"
  55 #include "memory/metaspaceUtils.hpp"
  56 #include "memory/oopFactory.hpp"
  57 #include "memory/resourceArea.hpp"
  58 #include "memory/universe.hpp"
  59 #include "oops/array.hpp"
  60 #include "oops/compressedOops.hpp"
  61 #include "oops/constantPool.inline.hpp"
  62 #include "oops/klass.inline.hpp"
  63 #include "oops/method.inline.hpp"
  64 #include "oops/objArrayKlass.hpp"
  65 #include "oops/objArrayOop.inline.hpp"
  66 #include "oops/oop.inline.hpp"
  67 #include "oops/typeArrayOop.inline.hpp"
  68 #include "prims/jvmtiEnvBase.hpp"
  69 #include "prims/resolvedMethodTable.hpp"
  70 #include "prims/wbtestmethods/parserTests.hpp"
  71 #include "prims/whitebox.inline.hpp"
  72 #include "runtime/arguments.hpp"
  73 #include "runtime/atomic.hpp"
  74 #include "runtime/deoptimization.hpp"
  75 #include "runtime/fieldDescriptor.inline.hpp"
  76 #include "runtime/flags/jvmFlag.hpp"
  77 #include "runtime/flags/jvmFlagAccess.hpp"
  78 #include "runtime/frame.inline.hpp"
  79 #include "runtime/handles.inline.hpp"
  80 #include "runtime/handshake.hpp"
  81 #include "runtime/interfaceSupport.inline.hpp"
  82 #include "runtime/javaCalls.hpp"
  83 #include "runtime/javaThread.inline.hpp"
  84 #include "runtime/jniHandles.inline.hpp"
  85 #include "runtime/os.hpp"
  86 #include "runtime/stackFrameStream.inline.hpp"
  87 #include "runtime/synchronizer.hpp"
  88 #include "runtime/threadSMR.hpp"
  89 #include "runtime/vframe.hpp"
  90 #include "runtime/vm_version.hpp"
  91 #include "services/mallocSiteTable.hpp"
  92 #include "services/memoryService.hpp"
  93 #include "services/memTracker.hpp"
  94 #include "utilities/align.hpp"
  95 #include "utilities/debug.hpp"
  96 #include "utilities/elfFile.hpp"
  97 #include "utilities/exceptions.hpp"
  98 #include "utilities/macros.hpp"
  99 #include "utilities/nativeCallStack.hpp"
 100 #include "utilities/ostream.hpp"
 101 #if INCLUDE_G1GC
 102 #include "gc/g1/g1Arguments.hpp"
 103 #include "gc/g1/g1CollectedHeap.inline.hpp"
 104 #include "gc/g1/g1ConcurrentMark.hpp"
 105 #include "gc/g1/g1ConcurrentMarkThread.inline.hpp"
 106 #include "gc/g1/heapRegionManager.hpp"
 107 #include "gc/g1/heapRegionRemSet.inline.hpp"
 108 #endif // INCLUDE_G1GC
 109 #if INCLUDE_PARALLELGC
 110 #include "gc/parallel/parallelScavengeHeap.inline.hpp"
 111 #endif // INCLUDE_PARALLELGC
 112 #if INCLUDE_ZGC
 113 #include "gc/z/zAddress.inline.hpp"
 114 #endif // INCLUDE_ZGC
 115 #if INCLUDE_JVMCI
 116 #include "jvmci/jvmciEnv.hpp"
 117 #include "jvmci/jvmciRuntime.hpp"
 118 #endif
 119 #ifdef LINUX
 120 #include "os_linux.hpp"
 121 #include "osContainer_linux.hpp"
 122 #include "cgroupSubsystem_linux.hpp"
 123 #endif
 124 
 125 #define CHECK_JNI_EXCEPTION_(env, value)                               \
 126   do {                                                                 \
 127     JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
 128     THREAD->clear_pending_jni_exception_check();                       \
 129     if (HAS_PENDING_EXCEPTION) {                                       \
 130       return(value);                                                   \
 131     }                                                                  \
 132   } while (0)
 133 
 134 #define CHECK_JNI_EXCEPTION(env)                                       \
 135   do {                                                                 \
 136     JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
 137     THREAD->clear_pending_jni_exception_check();                       \
 138     if (HAS_PENDING_EXCEPTION) {                                       \
 139       return;                                                          \
 140     }                                                                  \
 141   } while (0)
 142 
 143 bool WhiteBox::_used = false;
 144 volatile bool WhiteBox::compilation_locked = false;
 145 
 146 class VM_WhiteBoxOperation : public VM_Operation {
 147  public:
 148   VM_WhiteBoxOperation()                         { }
 149   VMOp_Type type()                  const        { return VMOp_WhiteBoxOperation; }
 150   bool allow_nested_vm_operations() const        { return true; }
 151 };
 152 
 153 
 154 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
 155   return (jlong)(void*)JNIHandles::resolve(obj);
 156 WB_END
 157 
 158 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
 159   return heapOopSize;
 160 WB_END
 161 
 162 WB_ENTRY(jint, WB_GetVMPageSize(JNIEnv* env, jobject o))
 163   return (jint)os::vm_page_size();
 164 WB_END
 165 
 166 WB_ENTRY(jlong, WB_GetVMAllocationGranularity(JNIEnv* env, jobject o))
 167   return os::vm_allocation_granularity();
 168 WB_END
 169 
 170 WB_ENTRY(jlong, WB_GetVMLargePageSize(JNIEnv* env, jobject o))
 171   return os::large_page_size();
 172 WB_END
 173 
 174 class WBIsKlassAliveClosure : public LockedClassesDo {
 175     Symbol* _name;
 176     int _count;
 177 public:
 178     WBIsKlassAliveClosure(Symbol* name) : _name(name), _count(0) {}
 179 
 180     void do_klass(Klass* k) {
 181       Symbol* ksym = k->name();
 182       if (ksym->fast_compare(_name) == 0) {
 183         _count++;
 184       } else if (k->is_instance_klass()) {
 185         // Need special handling for hidden classes because the JVM
 186         // appends "+<hex-address>" to hidden class names.
 187         InstanceKlass *ik = InstanceKlass::cast(k);
 188         if (ik->is_hidden()) {
 189           ResourceMark rm;
 190           char* k_name = ksym->as_C_string();
 191           // Find the first '+' char and truncate the string at that point.
 192           // NOTE: This will not work correctly if the original hidden class
 193           // name contains a '+'.
 194           char* plus_char = strchr(k_name, '+');
 195           if (plus_char != nullptr) {
 196             *plus_char = 0;
 197             char* c_name = _name->as_C_string();
 198             if (strcmp(c_name, k_name) == 0) {
 199               _count++;
 200             }
 201           }
 202         }
 203       }
 204     }
 205 
 206     int count() const {
 207         return _count;
 208     }
 209 };
 210 
 211 WB_ENTRY(jint, WB_CountAliveClasses(JNIEnv* env, jobject target, jstring name))
 212   oop h_name = JNIHandles::resolve(name);
 213   if (h_name == nullptr) {
 214     return 0;
 215   }
 216   Symbol* sym = java_lang_String::as_symbol(h_name);
 217   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
 218 
 219   WBIsKlassAliveClosure closure(sym);
 220   ClassLoaderDataGraph::classes_do(&closure);
 221 
 222   // Return the count of alive classes with this name.
 223   return closure.count();
 224 WB_END
 225 
 226 WB_ENTRY(jint, WB_GetSymbolRefcount(JNIEnv* env, jobject unused, jstring name))
 227   oop h_name = JNIHandles::resolve(name);
 228   if (h_name == nullptr) {
 229     return 0;
 230   }
 231   Symbol* sym = java_lang_String::as_symbol(h_name);
 232   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
 233   return (jint)sym->refcount();
 234 WB_END
 235 
 236 
 237 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 238 #if INCLUDE_JVMTI
 239   ResourceMark rm;
 240   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 241   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 242   jvmtiError err = jvmti_env->AddToBootstrapClassLoaderSearch(seg);
 243   assert(err == JVMTI_ERROR_NONE, "must not fail");
 244 #endif
 245 }
 246 WB_END
 247 
 248 WB_ENTRY(void, WB_AddToSystemClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 249 #if INCLUDE_JVMTI
 250   ResourceMark rm;
 251   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 252   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 253   jvmtiError err = jvmti_env->AddToSystemClassLoaderSearch(seg);
 254   assert(err == JVMTI_ERROR_NONE, "must not fail");
 255 #endif
 256 }
 257 WB_END
 258 
 259 
 260 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
 261   return (jlong)Arguments::max_heap_for_compressed_oops();
 262 }
 263 WB_END
 264 
 265 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
 266   tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap " SIZE_FORMAT " "
 267                 "Maximum heap " SIZE_FORMAT " Space alignment " SIZE_FORMAT " Heap alignment " SIZE_FORMAT,
 268                 MinHeapSize,
 269                 InitialHeapSize,
 270                 MaxHeapSize,
 271                 SpaceAlignment,
 272                 HeapAlignment);
 273 }
 274 WB_END
 275 
 276 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))
 277   size_t granularity = os::vm_allocation_granularity();
 278   ReservedHeapSpace rhs(100 * granularity, granularity, os::vm_page_size());
 279   VirtualSpace vs;
 280   vs.initialize(rhs, 50 * granularity);
 281 
 282   // Check if constraints are complied
 283   if (!( UseCompressedOops && rhs.base() != nullptr &&
 284          CompressedOops::base() != nullptr &&
 285          CompressedOops::use_implicit_null_checks() )) {
 286     tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "
 287                   "\tUseCompressedOops is %d\n"
 288                   "\trhs.base() is " PTR_FORMAT "\n"
 289                   "\tCompressedOops::base() is " PTR_FORMAT "\n"
 290                   "\tCompressedOops::use_implicit_null_checks() is %d",
 291                   UseCompressedOops,
 292                   p2i(rhs.base()),
 293                   p2i(CompressedOops::base()),
 294                   CompressedOops::use_implicit_null_checks());
 295     return;
 296   }
 297   tty->print_cr("Reading from no access area... ");
 298   tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",
 299                 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));
 300 WB_END
 301 
 302 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,
 303                                            size_t magnitude, size_t iterations) {
 304   size_t granularity = os::vm_allocation_granularity();
 305   ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, os::vm_page_size());
 306   VirtualSpace vs;
 307   if (!vs.initialize(rhs, 0)) {
 308     tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");
 309     return 3;
 310   }
 311 
 312   int seed = os::random();
 313   tty->print_cr("Random seed is %d", seed);
 314 
 315   for (size_t i = 0; i < iterations; i++) {
 316 
 317     // Whether we will shrink or grow
 318     bool shrink = os::random() % 2L == 0;
 319 
 320     // Get random delta to resize virtual space
 321     size_t delta = (size_t)os::random() % magnitude;
 322 
 323     // If we are about to shrink virtual space below zero, then expand instead
 324     if (shrink && vs.committed_size() < delta) {
 325       shrink = false;
 326     }
 327 
 328     // Resizing by delta
 329     if (shrink) {
 330       vs.shrink_by(delta);
 331     } else {
 332       // If expanding fails expand_by will silently return false
 333       vs.expand_by(delta, true);
 334     }
 335   }
 336   return 0;
 337 }
 338 
 339 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,
 340         jlong reserved_space_size, jlong magnitude, jlong iterations))
 341   tty->print_cr("reservedSpaceSize=" JLONG_FORMAT ", magnitude=" JLONG_FORMAT ", "
 342                 "iterations=" JLONG_FORMAT "\n", reserved_space_size, magnitude,
 343                 iterations);
 344   if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {
 345     tty->print_cr("One of variables printed above is negative. Can't proceed.\n");
 346     return 1;
 347   }
 348 
 349   // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is
 350   // always 8 byte. That's why we should avoid overflow in case of 32bit platform.
 351   if (sizeof(size_t) < sizeof(jlong)) {
 352     jlong size_t_max_value = (jlong)SIZE_MAX;
 353     if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value
 354         || iterations > size_t_max_value) {
 355       tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");
 356       return 2;
 357     }
 358   }
 359 
 360   return wb_stress_virtual_space_resize((size_t) reserved_space_size,
 361                                         (size_t) magnitude, (size_t) iterations);
 362 WB_END
 363 
 364 WB_ENTRY(jboolean, WB_IsGCSupported(JNIEnv* env, jobject o, jint name))
 365   return GCConfig::is_gc_supported((CollectedHeap::Name)name);
 366 WB_END
 367 
 368 WB_ENTRY(jboolean, WB_IsGCSupportedByJVMCICompiler(JNIEnv* env, jobject o, jint name))
 369 #if INCLUDE_JVMCI
 370   if (EnableJVMCI) {
 371     // Enter the JVMCI env that will be used by the CompileBroker.
 372     JVMCIEnv jvmciEnv(thread, __FILE__, __LINE__);
 373     return jvmciEnv.runtime()->is_gc_supported(&jvmciEnv, (CollectedHeap::Name)name);
 374   }
 375 #endif
 376   return false;
 377 WB_END
 378 
 379 WB_ENTRY(jboolean, WB_IsGCSelected(JNIEnv* env, jobject o, jint name))
 380   return GCConfig::is_gc_selected((CollectedHeap::Name)name);
 381 WB_END
 382 
 383 WB_ENTRY(jboolean, WB_IsGCSelectedErgonomically(JNIEnv* env, jobject o))
 384   return GCConfig::is_gc_selected_ergonomically();
 385 WB_END
 386 
 387 WB_ENTRY(jboolean, WB_isObjectInOldGen(JNIEnv* env, jobject o, jobject obj))
 388   oop p = JNIHandles::resolve(obj);
 389 #if INCLUDE_G1GC
 390   if (UseG1GC) {
 391     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 392     const HeapRegion* hr = g1h->heap_region_containing(p);
 393     return !(hr->is_young());
 394   }
 395 #endif
 396 #if INCLUDE_PARALLELGC
 397   if (UseParallelGC) {
 398     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
 399     return !psh->is_in_young(p);
 400   }
 401 #endif
 402 #if INCLUDE_ZGC
 403   if (UseZGC) {
 404     if (ZGenerational) {
 405       return ZHeap::heap()->is_old(to_zaddress(p));
 406     } else {
 407       return Universe::heap()->is_in(p);
 408     }
 409   }
 410 #endif
 411 #if INCLUDE_SHENANDOAHGC
 412   if (UseShenandoahGC) {
 413     return Universe::heap()->is_in(p);
 414   }
 415 #endif
 416   GenCollectedHeap* gch = GenCollectedHeap::heap();
 417   return !gch->is_in_young(p);
 418 WB_END
 419 
 420 WB_ENTRY(jlong, WB_GetObjectSize(JNIEnv* env, jobject o, jobject obj))
 421   oop p = JNIHandles::resolve(obj);
 422   return p->size() * HeapWordSize;
 423 WB_END
 424 
 425 WB_ENTRY(jlong, WB_GetHeapSpaceAlignment(JNIEnv* env, jobject o))
 426   return (jlong)SpaceAlignment;
 427 WB_END
 428 
 429 WB_ENTRY(jlong, WB_GetHeapAlignment(JNIEnv* env, jobject o))
 430   return (jlong)HeapAlignment;
 431 WB_END
 432 
 433 WB_ENTRY(jboolean, WB_SupportsConcurrentGCBreakpoints(JNIEnv* env, jobject o))
 434   return Universe::heap()->supports_concurrent_gc_breakpoints();
 435 WB_END
 436 
 437 WB_ENTRY(void, WB_ConcurrentGCAcquireControl(JNIEnv* env, jobject o))
 438   ConcurrentGCBreakpoints::acquire_control();
 439 WB_END
 440 
 441 WB_ENTRY(void, WB_ConcurrentGCReleaseControl(JNIEnv* env, jobject o))
 442   ConcurrentGCBreakpoints::release_control();
 443 WB_END
 444 
 445 WB_ENTRY(void, WB_ConcurrentGCRunToIdle(JNIEnv* env, jobject o))
 446   ConcurrentGCBreakpoints::run_to_idle();
 447 WB_END
 448 
 449 WB_ENTRY(jboolean, WB_ConcurrentGCRunTo(JNIEnv* env, jobject o, jobject at))
 450   Handle h_name(THREAD, JNIHandles::resolve(at));
 451   ResourceMark rm;
 452   const char* c_name = java_lang_String::as_utf8_string(h_name());
 453   return ConcurrentGCBreakpoints::run_to(c_name);
 454 WB_END
 455 
 456 #if INCLUDE_G1GC
 457 
 458 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
 459   if (UseG1GC) {
 460     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 461     oop result = JNIHandles::resolve(obj);
 462     const HeapRegion* hr = g1h->heap_region_containing(result);
 463     return hr->is_humongous();
 464   }
 465   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1IsHumongous: G1 GC is not enabled");
 466 WB_END
 467 
 468 WB_ENTRY(jboolean, WB_G1BelongsToHumongousRegion(JNIEnv* env, jobject o, jlong addr))
 469   if (UseG1GC) {
 470     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 471     const HeapRegion* hr = g1h->heap_region_containing((void*) addr);
 472     return hr->is_humongous();
 473   }
 474   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1BelongsToHumongousRegion: G1 GC is not enabled");
 475 WB_END
 476 
 477 WB_ENTRY(jboolean, WB_G1BelongsToFreeRegion(JNIEnv* env, jobject o, jlong addr))
 478   if (UseG1GC) {
 479     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 480     const HeapRegion* hr = g1h->heap_region_containing((void*) addr);
 481     return hr->is_free();
 482   }
 483   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1BelongsToFreeRegion: G1 GC is not enabled");
 484 WB_END
 485 
 486 WB_ENTRY(jlong, WB_G1NumMaxRegions(JNIEnv* env, jobject o))
 487   if (UseG1GC) {
 488     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 489     size_t nr = g1h->max_regions();
 490     return (jlong)nr;
 491   }
 492   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1NumMaxRegions: G1 GC is not enabled");
 493 WB_END
 494 
 495 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
 496   if (UseG1GC) {
 497     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 498     size_t nr = g1h->num_free_regions();
 499     return (jlong)nr;
 500   }
 501   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1NumFreeRegions: G1 GC is not enabled");
 502 WB_END
 503 
 504 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
 505   if (UseG1GC) {
 506     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 507     return g1h->concurrent_mark()->cm_thread()->in_progress();
 508   }
 509   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1InConcurrentMark: G1 GC is not enabled");
 510 WB_END
 511 
 512 WB_ENTRY(jint, WB_G1CompletedConcurrentMarkCycles(JNIEnv* env, jobject o))
 513   if (UseG1GC) {
 514     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 515     G1ConcurrentMark* cm = g1h->concurrent_mark();
 516     return cm->completed_mark_cycles();
 517   }
 518   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1CompletedConcurrentMarkCycles: G1 GC is not enabled");
 519 WB_END
 520 
 521 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
 522   if (UseG1GC) {
 523     return (jint)HeapRegion::GrainBytes;
 524   }
 525   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1RegionSize: G1 GC is not enabled");
 526 WB_END
 527 
 528 WB_ENTRY(jboolean, WB_G1HasRegionsToUncommit(JNIEnv* env, jobject o))
 529   if (UseG1GC) {
 530     return G1CollectedHeap::heap()->has_uncommittable_regions();
 531   }
 532   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1HasRegionsToUncommit: G1 GC is not enabled");
 533 WB_END
 534 
 535 #endif // INCLUDE_G1GC
 536 
 537 #if INCLUDE_PARALLELGC
 538 
 539 WB_ENTRY(jlong, WB_PSVirtualSpaceAlignment(JNIEnv* env, jobject o))
 540   if (UseParallelGC) {
 541     return GenAlignment;
 542   }
 543   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_PSVirtualSpaceAlignment: Parallel GC is not enabled");
 544 WB_END
 545 
 546 WB_ENTRY(jlong, WB_PSHeapGenerationAlignment(JNIEnv* env, jobject o))
 547   if (UseParallelGC) {
 548     return GenAlignment;
 549   }
 550   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_PSHeapGenerationAlignment: Parallel GC is not enabled");
 551 WB_END
 552 
 553 #endif // INCLUDE_PARALLELGC
 554 
 555 #if INCLUDE_G1GC
 556 
 557 WB_ENTRY(jobject, WB_G1AuxiliaryMemoryUsage(JNIEnv* env))
 558   if (UseG1GC) {
 559     ResourceMark rm(THREAD);
 560     G1CollectedHeap* g1h = G1CollectedHeap::heap();
 561     MemoryUsage usage = g1h->get_auxiliary_data_memory_usage();
 562     Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 563     return JNIHandles::make_local(THREAD, h());
 564   }
 565   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1AuxiliaryMemoryUsage: G1 GC is not enabled");
 566 WB_END
 567 
 568 WB_ENTRY(jint, WB_G1ActiveMemoryNodeCount(JNIEnv* env, jobject o))
 569   if (UseG1GC) {
 570     G1NUMA* numa = G1NUMA::numa();
 571     return (jint)numa->num_active_nodes();
 572   }
 573   THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1ActiveMemoryNodeCount: G1 GC is not enabled");
 574 WB_END
 575 
 576 WB_ENTRY(jintArray, WB_G1MemoryNodeIds(JNIEnv* env, jobject o))
 577   if (UseG1GC) {
 578     G1NUMA* numa = G1NUMA::numa();
 579     int num_node_ids = (int)numa->num_active_nodes();
 580     const int* node_ids = numa->node_ids();
 581 
 582     typeArrayOop result = oopFactory::new_intArray(num_node_ids, CHECK_NULL);
 583     for (int i = 0; i < num_node_ids; i++) {
 584       result->int_at_put(i, (jint)node_ids[i]);
 585     }
 586     return (jintArray) JNIHandles::make_local(THREAD, result);
 587   }
 588   THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1MemoryNodeIds: G1 GC is not enabled");
 589 WB_END
 590 
 591 class OldRegionsLivenessClosure: public HeapRegionClosure {
 592 
 593  private:
 594   const int _liveness;
 595   size_t _total_count;
 596   size_t _total_memory;
 597   size_t _total_memory_to_free;
 598 
 599  public:
 600   OldRegionsLivenessClosure(int liveness) :
 601     _liveness(liveness),
 602     _total_count(0),
 603     _total_memory(0),
 604     _total_memory_to_free(0) { }
 605 
 606     size_t total_count() { return _total_count; }
 607     size_t total_memory() { return _total_memory; }
 608     size_t total_memory_to_free() { return _total_memory_to_free; }
 609 
 610   bool do_heap_region(HeapRegion* r) {
 611     if (r->is_old()) {
 612       size_t live = r->live_bytes();
 613       size_t size = r->used();
 614       size_t reg_size = HeapRegion::GrainBytes;
 615       if (size > 0 && ((int)(live * 100 / size) < _liveness)) {
 616         _total_memory += size;
 617         ++_total_count;
 618         if (size == reg_size) {
 619           // We don't include non-full regions since they are unlikely included in mixed gc
 620           // for testing purposes it's enough to have lowest estimation of total memory that is expected to be freed
 621           _total_memory_to_free += size - live;
 622         }
 623       }
 624     }
 625     return false;
 626   }
 627 };
 628 
 629 
 630 WB_ENTRY(jlongArray, WB_G1GetMixedGCInfo(JNIEnv* env, jobject o, jint liveness))
 631   if (!UseG1GC) {
 632     THROW_MSG_NULL(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1GetMixedGCInfo: G1 GC is not enabled");
 633   }
 634   if (liveness < 0) {
 635     THROW_MSG_NULL(vmSymbols::java_lang_IllegalArgumentException(), "liveness value should be non-negative");
 636   }
 637 
 638   G1CollectedHeap* g1h = G1CollectedHeap::heap();
 639   OldRegionsLivenessClosure rli(liveness);
 640   g1h->heap_region_iterate(&rli);
 641 
 642   typeArrayOop result = oopFactory::new_longArray(3, CHECK_NULL);
 643   result->long_at_put(0, rli.total_count());
 644   result->long_at_put(1, rli.total_memory());
 645   result->long_at_put(2, rli.total_memory_to_free());
 646   return (jlongArray) JNIHandles::make_local(THREAD, result);
 647 WB_END
 648 
 649 #endif // INCLUDE_G1GC
 650 
 651 // Alloc memory using the test memory type so that we can use that to see if
 652 // NMT picks it up correctly
 653 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
 654   jlong addr = 0;
 655   addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
 656   return addr;
 657 WB_END
 658 
 659 // Alloc memory with pseudo call stack. The test can create pseudo malloc
 660 // allocation site to stress the malloc tracking.
 661 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))
 662   address pc = (address)(size_t)pseudo_stack;
 663   NativeCallStack stack(&pc, 1);
 664   return (jlong)(uintptr_t)os::malloc(size, mtTest, stack);
 665 WB_END
 666 
 667 // Alloc memory with pseudo call stack and specific memory type.
 668 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStackAndType(JNIEnv* env, jobject o, jlong size, jint pseudo_stack, jint type))
 669   address pc = (address)(size_t)pseudo_stack;
 670   NativeCallStack stack(&pc, 1);
 671   return (jlong)(uintptr_t)os::malloc(size, (MEMFLAGS)type, stack);
 672 WB_END
 673 
 674 // Free the memory allocated by NMTAllocTest
 675 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
 676   os::free((void*)(uintptr_t)mem);
 677 WB_END
 678 
 679 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
 680   jlong addr = 0;
 681 
 682   addr = (jlong)(uintptr_t)os::reserve_memory(size);
 683   MemTracker::record_virtual_memory_type((address)addr, mtTest);
 684 
 685   return addr;
 686 WB_END
 687 
 688 WB_ENTRY(jlong, WB_NMTAttemptReserveMemoryAt(JNIEnv* env, jobject o, jlong addr, jlong size))
 689   addr = (jlong)(uintptr_t)os::attempt_reserve_memory_at((char*)(uintptr_t)addr, (size_t)size);
 690   MemTracker::record_virtual_memory_type((address)addr, mtTest);
 691 
 692   return addr;
 693 WB_END
 694 
 695 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 696   os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
 697   MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
 698 WB_END
 699 
 700 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 701   os::uncommit_memory((char *)(uintptr_t)addr, size);
 702 WB_END
 703 
 704 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 705   os::release_memory((char *)(uintptr_t)addr, size);
 706 WB_END
 707 
 708 WB_ENTRY(jint, WB_NMTGetHashSize(JNIEnv* env, jobject o))
 709   int hash_size = MallocSiteTable::hash_buckets();
 710   assert(hash_size > 0, "NMT hash_size should be > 0");
 711   return (jint)hash_size;
 712 WB_END
 713 
 714 WB_ENTRY(jlong, WB_NMTNewArena(JNIEnv* env, jobject o, jlong init_size))
 715   Arena* arena =  new (mtTest) Arena(mtTest, size_t(init_size));
 716   return (jlong)arena;
 717 WB_END
 718 
 719 WB_ENTRY(void, WB_NMTFreeArena(JNIEnv* env, jobject o, jlong arena))
 720   Arena* a = (Arena*)arena;
 721   delete a;
 722 WB_END
 723 
 724 WB_ENTRY(void, WB_NMTArenaMalloc(JNIEnv* env, jobject o, jlong arena, jlong size))
 725   Arena* a = (Arena*)arena;
 726   a->Amalloc(size_t(size));
 727 WB_END
 728 
 729 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
 730   assert(method != nullptr, "method should not be null");
 731   ThreadToNativeFromVM ttn(thread);
 732   return env->FromReflectedMethod(method);
 733 }
 734 
 735 // Deoptimizes all compiled frames and makes nmethods not entrant if it's requested
 736 class VM_WhiteBoxDeoptimizeFrames : public VM_WhiteBoxOperation {
 737  private:
 738   int _result;
 739   const bool _make_not_entrant;
 740  public:
 741   VM_WhiteBoxDeoptimizeFrames(bool make_not_entrant) :
 742         _result(0), _make_not_entrant(make_not_entrant) { }
 743   int  result() const { return _result; }
 744 
 745   void doit() {
 746     for (JavaThreadIteratorWithHandle jtiwh; JavaThread *t = jtiwh.next(); ) {
 747       if (t->has_last_Java_frame()) {
 748         for (StackFrameStream fst(t, false /* update */, true /* process_frames */); !fst.is_done(); fst.next()) {
 749           frame* f = fst.current();
 750           if (f->can_be_deoptimized() && !f->is_deoptimized_frame()) {
 751             Deoptimization::deoptimize(t, *f);
 752             if (_make_not_entrant) {
 753                 CompiledMethod* cm = CodeCache::find_compiled(f->pc());
 754                 assert(cm != nullptr, "sanity check");
 755                 cm->make_not_entrant();
 756             }
 757             ++_result;
 758           }
 759         }
 760       }
 761     }
 762   }
 763 };
 764 
 765 WB_ENTRY(jint, WB_DeoptimizeFrames(JNIEnv* env, jobject o, jboolean make_not_entrant))
 766   VM_WhiteBoxDeoptimizeFrames op(make_not_entrant == JNI_TRUE);
 767   VMThread::execute(&op);
 768   return op.result();
 769 WB_END
 770 
 771 WB_ENTRY(jboolean, WB_IsFrameDeoptimized(JNIEnv* env, jobject o, jint depth))
 772   bool result = false;
 773   if (thread->has_last_Java_frame()) {
 774     RegisterMap reg_map(thread,
 775                         RegisterMap::UpdateMap::include,
 776                         RegisterMap::ProcessFrames::include,
 777                         RegisterMap::WalkContinuation::skip);
 778     javaVFrame *jvf = thread->last_java_vframe(&reg_map);
 779     for (jint d = 0; d < depth && jvf != nullptr; d++) {
 780       jvf = jvf->java_sender();
 781     }
 782     result = jvf != nullptr && jvf->fr().is_deoptimized_frame();
 783   }
 784   return result;
 785 WB_END
 786 
 787 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
 788   DeoptimizationScope deopt_scope;
 789   CodeCache::mark_all_nmethods_for_deoptimization(&deopt_scope);
 790   deopt_scope.deoptimize_marked();
 791 WB_END
 792 
 793 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 794   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 795   int result = 0;
 796   CHECK_JNI_EXCEPTION_(env, result);
 797 
 798   DeoptimizationScope deopt_scope;
 799   {
 800     MutexLocker mu(Compile_lock);
 801     methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 802     if (is_osr) {
 803       result += mh->method_holder()->mark_osr_nmethods(&deopt_scope, mh());
 804     } else {
 805       MutexLocker ml(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
 806       if (mh->code() != nullptr) {
 807         deopt_scope.mark(mh->code());
 808         ++result;
 809       }
 810     }
 811     CodeCache::mark_for_deoptimization(&deopt_scope, mh());
 812   }
 813 
 814   deopt_scope.deoptimize_marked();
 815 
 816   return result;
 817 WB_END
 818 
 819 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 820   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 821   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 822   MutexLocker mu(Compile_lock);
 823   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 824   CompiledMethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 825   if (code == nullptr) {
 826     return JNI_FALSE;
 827   }
 828   return !code->is_marked_for_deoptimization();
 829 WB_END
 830 
 831 static bool is_excluded_for_compiler(AbstractCompiler* comp, methodHandle& mh) {
 832   if (comp == nullptr) {
 833     return true;
 834   }
 835   DirectiveSet* directive = DirectivesStack::getMatchingDirective(mh, comp);
 836   bool exclude = directive->ExcludeOption;
 837   DirectivesStack::release(directive);
 838   return exclude;
 839 }
 840 
 841 static bool can_be_compiled_at_level(methodHandle& mh, jboolean is_osr, int level) {
 842   if (is_osr) {
 843     return CompilationPolicy::can_be_osr_compiled(mh, level);
 844   } else {
 845     return CompilationPolicy::can_be_compiled(mh, level);
 846   }
 847 }
 848 
 849 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 850   if (method == nullptr || comp_level > CompilationPolicy::highest_compile_level()) {
 851     return false;
 852   }
 853   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 854   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 855   MutexLocker mu(Compile_lock);
 856   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 857 
 858   // The ExcludeOption directive is evaluated lazily upon compilation attempt. If a method was not tried to be compiled by
 859   // a compiler, yet, the method object is not set to be not compilable by that compiler. Thus, evaluate the compiler directive
 860   // to exclude a compilation of 'method'.
 861   if (comp_level == CompLevel_any) {
 862     // Both compilers could have ExcludeOption set. Check all combinations.
 863     bool excluded_c1 = is_excluded_for_compiler(CompileBroker::compiler1(), mh);
 864     bool excluded_c2 = is_excluded_for_compiler(CompileBroker::compiler2(), mh);
 865     if (excluded_c1 && excluded_c2) {
 866       // Compilation of 'method' excluded by both compilers.
 867       return false;
 868     }
 869 
 870     if (excluded_c1) {
 871       // C1 only has ExcludeOption set: Check if compilable with C2.
 872       return can_be_compiled_at_level(mh, is_osr, CompLevel_full_optimization);
 873     } else if (excluded_c2) {
 874       // C2 only has ExcludeOption set: Check if compilable with C1.
 875       return can_be_compiled_at_level(mh, is_osr, CompLevel_simple);
 876     }
 877   } else if (comp_level > CompLevel_none && is_excluded_for_compiler(CompileBroker::compiler((int)comp_level), mh)) {
 878     // Compilation of 'method' excluded by compiler used for 'comp_level'.
 879     return false;
 880   }
 881 
 882   return can_be_compiled_at_level(mh, is_osr, (int)comp_level);
 883 WB_END
 884 
 885 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
 886   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 887   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 888   MutexLocker mu(Compile_lock);
 889   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 890   return mh->queued_for_compilation();
 891 WB_END
 892 
 893 WB_ENTRY(jboolean, WB_IsIntrinsicAvailable(JNIEnv* env, jobject o, jobject method, jobject compilation_context, jint compLevel))
 894   if (compLevel < CompLevel_none || compLevel > CompilationPolicy::highest_compile_level()) {
 895     return false; // Intrinsic is not available on a non-existent compilation level.
 896   }
 897   jmethodID method_id, compilation_context_id;
 898   method_id = reflected_method_to_jmid(thread, env, method);
 899   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 900   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(method_id));
 901 
 902   DirectiveSet* directive;
 903   AbstractCompiler* comp = CompileBroker::compiler((int)compLevel);
 904   assert(comp != nullptr, "compiler not available");
 905   if (compilation_context != nullptr) {
 906     compilation_context_id = reflected_method_to_jmid(thread, env, compilation_context);
 907     CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 908     methodHandle cch(THREAD, Method::checked_resolve_jmethod_id(compilation_context_id));
 909     directive = DirectivesStack::getMatchingDirective(cch, comp);
 910   } else {
 911     // Calling with null matches default directive
 912     directive = DirectivesStack::getDefaultDirective(comp);
 913   }
 914   bool result = comp->is_intrinsic_available(mh, directive);
 915   DirectivesStack::release(directive);
 916   return result;
 917 WB_END
 918 
 919 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 920   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 921   CHECK_JNI_EXCEPTION_(env, CompLevel_none);
 922   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 923   CompiledMethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 924   return (code != nullptr ? code->comp_level() : CompLevel_none);
 925 WB_END
 926 
 927 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 928   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 929   CHECK_JNI_EXCEPTION(env);
 930   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 931   if (is_osr) {
 932     mh->set_not_osr_compilable("WhiteBox", comp_level);
 933   } else {
 934     mh->set_not_compilable("WhiteBox", comp_level);
 935   }
 936 WB_END
 937 
 938 WB_ENTRY(jint, WB_GetMethodDecompileCount(JNIEnv* env, jobject o, jobject method))
 939   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 940   CHECK_JNI_EXCEPTION_(env, 0);
 941   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 942   uint cnt = 0;
 943   MethodData* mdo = mh->method_data();
 944   if (mdo != nullptr) {
 945     cnt = mdo->decompile_count();
 946   }
 947   return cnt;
 948 WB_END
 949 
 950 // Get the trap count of a method for a specific reason. If the trap count for
 951 // that reason did overflow, this includes the overflow trap count of the method.
 952 // If 'reason' is null, the sum of the traps for all reasons will be returned.
 953 // This number includes the overflow trap count if the trap count for any reason
 954 // did overflow.
 955 WB_ENTRY(jint, WB_GetMethodTrapCount(JNIEnv* env, jobject o, jobject method, jstring reason_obj))
 956   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 957   CHECK_JNI_EXCEPTION_(env, 0);
 958   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 959   uint cnt = 0;
 960   MethodData* mdo = mh->method_data();
 961   if (mdo != nullptr) {
 962     ResourceMark rm(THREAD);
 963     char* reason_str = (reason_obj == nullptr) ?
 964       nullptr : java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(reason_obj));
 965     bool overflow = false;
 966     for (uint reason = 0; reason < mdo->trap_reason_limit(); reason++) {
 967       if (reason_str != nullptr && !strcmp(reason_str, Deoptimization::trap_reason_name(reason))) {
 968         cnt = mdo->trap_count(reason);
 969         // Count in the overflow trap count on overflow
 970         if (cnt == (uint)-1) {
 971           cnt = mdo->trap_count_limit() + mdo->overflow_trap_count();
 972         }
 973         break;
 974       } else if (reason_str == nullptr) {
 975         uint c = mdo->trap_count(reason);
 976         if (c == (uint)-1) {
 977           c = mdo->trap_count_limit();
 978           if (!overflow) {
 979             // Count overflow trap count just once
 980             overflow = true;
 981             c += mdo->overflow_trap_count();
 982           }
 983         }
 984         cnt += c;
 985       }
 986     }
 987   }
 988   return cnt;
 989 WB_END
 990 
 991 WB_ENTRY(jint, WB_GetDeoptCount(JNIEnv* env, jobject o, jstring reason_obj, jstring action_obj))
 992   if (reason_obj == nullptr && action_obj == nullptr) {
 993     return Deoptimization::total_deoptimization_count();
 994   }
 995   ResourceMark rm(THREAD);
 996   const char *reason_str = (reason_obj == nullptr) ?
 997     nullptr : java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(reason_obj));
 998   const char *action_str = (action_obj == nullptr) ?
 999     nullptr : java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(action_obj));
1000 
1001   return Deoptimization::deoptimization_count(reason_str, action_str);
1002 WB_END
1003 
1004 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
1005   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1006   CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
1007   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1008   CompiledMethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
1009   return (code != nullptr && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
1010 WB_END
1011 
1012 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
1013   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1014   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1015   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1016   bool result = mh->dont_inline();
1017   mh->set_dont_inline(value == JNI_TRUE);
1018   return result;
1019 WB_END
1020 
1021 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
1022   if (comp_level == CompLevel_any) {
1023     return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
1024         CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
1025   } else {
1026     return CompileBroker::queue_size(comp_level);
1027   }
1028 WB_END
1029 
1030 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
1031   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1032   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1033   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1034   bool result = mh->force_inline();
1035   mh->set_force_inline(value == JNI_TRUE);
1036   return result;
1037 WB_END
1038 
1039 #ifdef LINUX
1040 bool WhiteBox::validate_cgroup(const char* proc_cgroups,
1041                                const char* proc_self_cgroup,
1042                                const char* proc_self_mountinfo,
1043                                u1* cg_flags) {
1044   CgroupInfo cg_infos[CG_INFO_LENGTH];
1045   return CgroupSubsystemFactory::determine_type(cg_infos, proc_cgroups,
1046                                                     proc_self_cgroup,
1047                                                     proc_self_mountinfo, cg_flags);
1048 }
1049 #endif
1050 
1051 bool WhiteBox::compile_method(Method* method, int comp_level, int bci, JavaThread* THREAD) {
1052   // Screen for unavailable/bad comp level or null method
1053   AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1054   if (method == nullptr) {
1055     tty->print_cr("WB error: request to compile null method");
1056     return false;
1057   }
1058   if (comp_level > CompilationPolicy::highest_compile_level()) {
1059     tty->print_cr("WB error: invalid compilation level %d", comp_level);
1060     return false;
1061   }
1062   if (comp == nullptr) {
1063     tty->print_cr("WB error: no compiler for requested compilation level %d", comp_level);
1064     return false;
1065   }
1066 
1067   // Check if compilation is blocking
1068   methodHandle mh(THREAD, method);
1069   DirectiveSet* directive = DirectivesStack::getMatchingDirective(mh, comp);
1070   bool is_blocking = !directive->BackgroundCompilationOption;
1071   DirectivesStack::release(directive);
1072 
1073   // Compile method and check result
1074   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), CompileTask::Reason_Whitebox, CHECK_false);
1075   MutexLocker mu(THREAD, Compile_lock);
1076   bool is_queued = mh->queued_for_compilation();
1077   if ((!is_blocking && is_queued) || nm != nullptr) {
1078     return true;
1079   }
1080   // Check code again because compilation may be finished before Compile_lock is acquired.
1081   if (bci == InvocationEntryBci) {
1082     CompiledMethod* code = mh->code();
1083     if (code != nullptr && code->as_nmethod_or_null() != nullptr) {
1084       return true;
1085     }
1086   } else if (mh->lookup_osr_nmethod_for(bci, comp_level, false) != nullptr) {
1087     return true;
1088   }
1089   tty->print("WB error: failed to %s compile at level %d method ", is_blocking ? "blocking" : "", comp_level);
1090   mh->print_short_name(tty);
1091   tty->cr();
1092   if (is_blocking && is_queued) {
1093     tty->print_cr("WB error: blocking compilation is still in queue!");
1094   }
1095   return false;
1096 }
1097 
1098 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
1099   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1100   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1101   return WhiteBox::compile_method(Method::checked_resolve_jmethod_id(jmid), comp_level, bci, THREAD);
1102 WB_END
1103 
1104 WB_ENTRY(jboolean, WB_EnqueueInitializerForCompilation(JNIEnv* env, jobject o, jclass klass, jint comp_level))
1105   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1106   Method* clinit = ik->class_initializer();
1107   if (clinit == nullptr || clinit->method_holder()->is_not_initialized()) {
1108     return false;
1109   }
1110   return WhiteBox::compile_method(clinit, comp_level, InvocationEntryBci, THREAD);
1111 WB_END
1112 
1113 WB_ENTRY(jboolean, WB_ShouldPrintAssembly(JNIEnv* env, jobject o, jobject method, jint comp_level))
1114   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1115   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1116 
1117   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1118   DirectiveSet* directive = DirectivesStack::getMatchingDirective(mh, CompileBroker::compiler(comp_level));
1119   bool result = directive->PrintAssemblyOption;
1120   DirectivesStack::release(directive);
1121 
1122   return result;
1123 WB_END
1124 
1125 WB_ENTRY(jint, WB_MatchesInline(JNIEnv* env, jobject o, jobject method, jstring pattern))
1126   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1127   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1128 
1129   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1130 
1131   ResourceMark rm(THREAD);
1132   const char* error_msg = nullptr;
1133   char* method_str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(pattern));
1134   InlineMatcher* m = InlineMatcher::parse_inline_pattern(method_str, error_msg);
1135 
1136   if (m == nullptr) {
1137     assert(error_msg != nullptr, "Always have an error message");
1138     tty->print_cr("Got error: %s", error_msg);
1139     return -1; // Pattern failed
1140   }
1141 
1142   // Pattern works - now check if it matches
1143   int result;
1144   if (m->match(mh, InlineMatcher::force_inline)) {
1145     result = 2; // Force inline match
1146   } else if (m->match(mh, InlineMatcher::dont_inline)) {
1147     result = 1; // Dont inline match
1148   } else {
1149     result = 0; // No match
1150   }
1151   delete m;
1152   return result;
1153 WB_END
1154 
1155 WB_ENTRY(jint, WB_MatchesMethod(JNIEnv* env, jobject o, jobject method, jstring pattern))
1156   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1157   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
1158 
1159   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1160 
1161   ResourceMark rm;
1162   char* method_str = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(pattern));
1163 
1164   const char* error_msg = nullptr;
1165 
1166   BasicMatcher* m = BasicMatcher::parse_method_pattern(method_str, error_msg, false);
1167   if (m == nullptr) {
1168     assert(error_msg != nullptr, "Must have error_msg");
1169     tty->print_cr("Got error: %s", error_msg);
1170     return -1;
1171   }
1172 
1173   // Pattern works - now check if it matches
1174   int result = m->matches(mh);
1175   delete m;
1176   assert(result == 0 || result == 1, "Result out of range");
1177   return result;
1178 WB_END
1179 
1180 WB_ENTRY(void, WB_MarkMethodProfiled(JNIEnv* env, jobject o, jobject method))
1181   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1182   CHECK_JNI_EXCEPTION(env);
1183   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1184 
1185   MethodData* mdo = mh->method_data();
1186   if (mdo == nullptr) {
1187     Method::build_profiling_method_data(mh, CHECK_AND_CLEAR);
1188     mdo = mh->method_data();
1189   }
1190   mdo->init();
1191   InvocationCounter* icnt = mdo->invocation_counter();
1192   InvocationCounter* bcnt = mdo->backedge_counter();
1193   // set i-counter according to CompilationPolicy::is_method_profiled
1194   icnt->set(Tier4MinInvocationThreshold);
1195   bcnt->set(Tier4CompileThreshold);
1196 WB_END
1197 
1198 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
1199   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1200   CHECK_JNI_EXCEPTION(env);
1201   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1202   MutexLocker mu(THREAD, Compile_lock);
1203   MethodData* mdo = mh->method_data();
1204   MethodCounters* mcs = mh->method_counters();
1205 
1206   if (mdo != nullptr) {
1207     mdo->init();
1208     ResourceMark rm(THREAD);
1209     int arg_count = mdo->method()->size_of_parameters();
1210     for (int i = 0; i < arg_count; i++) {
1211       mdo->set_arg_modified(i, 0);
1212     }
1213     MutexLocker mu(THREAD, mdo->extra_data_lock());
1214     mdo->clean_method_data(/*always_clean*/true);
1215   }
1216 
1217   mh->clear_is_not_c1_compilable();
1218   mh->clear_is_not_c2_compilable();
1219   mh->clear_is_not_c2_osr_compilable();
1220   NOT_PRODUCT(mh->set_compiled_invocation_count(0));
1221   if (mcs != nullptr) {
1222     mcs->clear_counters();
1223   }
1224 WB_END
1225 
1226 template <typename T, int type_enum>
1227 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value) {
1228   if (name == nullptr) {
1229     return false;
1230   }
1231   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1232   const char* flag_name = env->GetStringUTFChars(name, nullptr);
1233   CHECK_JNI_EXCEPTION_(env, false);
1234   const JVMFlag* flag = JVMFlag::find_declared_flag(flag_name);
1235   JVMFlag::Error result = JVMFlagAccess::get<T, type_enum>(flag, value);
1236   env->ReleaseStringUTFChars(name, flag_name);
1237   return (result == JVMFlag::SUCCESS);
1238 }
1239 
1240 template <typename T, int type_enum>
1241 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value) {
1242   if (name == nullptr) {
1243     return false;
1244   }
1245   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1246   const char* flag_name = env->GetStringUTFChars(name, nullptr);
1247   CHECK_JNI_EXCEPTION_(env, false);
1248   JVMFlag* flag = JVMFlag::find_flag(flag_name);
1249   JVMFlag::Error result = JVMFlagAccess::set<T, type_enum>(flag, value, JVMFlagOrigin::INTERNAL);
1250   env->ReleaseStringUTFChars(name, flag_name);
1251   return (result == JVMFlag::SUCCESS);
1252 }
1253 
1254 template <typename T>
1255 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {
1256   ResourceMark rm(thread);
1257   jclass clazz = env->FindClass(name->as_C_string());
1258   CHECK_JNI_EXCEPTION_(env, nullptr);
1259   jmethodID methodID = env->GetStaticMethodID(clazz,
1260         vmSymbols::valueOf_name()->as_C_string(),
1261         sig->as_C_string());
1262   CHECK_JNI_EXCEPTION_(env, nullptr);
1263   jobject result = env->CallStaticObjectMethod(clazz, methodID, value);
1264   CHECK_JNI_EXCEPTION_(env, nullptr);
1265   return result;
1266 }
1267 
1268 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {
1269   return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);
1270 }
1271 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {
1272   return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);
1273 }
1274 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {
1275   return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);
1276 }
1277 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {
1278   return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);
1279 }*/
1280 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {
1281   return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);
1282 }
1283 
1284 static const JVMFlag* getVMFlag(JavaThread* thread, JNIEnv* env, jstring name) {
1285   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1286   const char* flag_name = env->GetStringUTFChars(name, nullptr);
1287   CHECK_JNI_EXCEPTION_(env, nullptr);
1288   const JVMFlag* result = JVMFlag::find_declared_flag(flag_name);
1289   env->ReleaseStringUTFChars(name, flag_name);
1290   return result;
1291 }
1292 
1293 WB_ENTRY(jboolean, WB_IsConstantVMFlag(JNIEnv* env, jobject o, jstring name))
1294   const JVMFlag* flag = getVMFlag(thread, env, name);
1295   return (flag != nullptr) && flag->is_constant_in_binary();
1296 WB_END
1297 
1298 WB_ENTRY(jboolean, WB_IsDefaultVMFlag(JNIEnv* env, jobject o, jstring name))
1299   const JVMFlag* flag = getVMFlag(thread, env, name);
1300   return (flag != nullptr) && flag->is_default();
1301 WB_END
1302 
1303 WB_ENTRY(jboolean, WB_IsLockedVMFlag(JNIEnv* env, jobject o, jstring name))
1304   const JVMFlag* flag = getVMFlag(thread, env, name);
1305   return (flag != nullptr) && !(flag->is_unlocked() || flag->is_unlocker());
1306 WB_END
1307 
1308 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))
1309   bool result;
1310   if (GetVMFlag <JVM_FLAG_TYPE(bool)> (thread, env, name, &result)) {
1311     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1312     return booleanBox(thread, env, result);
1313   }
1314   return nullptr;
1315 WB_END
1316 
1317 template <typename T, int type_enum>
1318 jobject GetVMFlag_longBox(JNIEnv* env, JavaThread* thread, jstring name) {
1319   T result;
1320   if (GetVMFlag <T, type_enum> (thread, env, name, &result)) {
1321     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1322     return longBox(thread, env, result);
1323   }
1324   return nullptr;
1325 }
1326 
1327 WB_ENTRY(jobject, WB_GetIntVMFlag(JNIEnv* env, jobject o, jstring name))
1328   return GetVMFlag_longBox<JVM_FLAG_TYPE(int)>(env, thread, name);
1329 WB_END
1330 
1331 WB_ENTRY(jobject, WB_GetUintVMFlag(JNIEnv* env, jobject o, jstring name))
1332   return GetVMFlag_longBox<JVM_FLAG_TYPE(uint)>(env, thread, name);
1333 WB_END
1334 
1335 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))
1336   return GetVMFlag_longBox<JVM_FLAG_TYPE(intx)>(env, thread, name);
1337 WB_END
1338 
1339 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))
1340   return GetVMFlag_longBox<JVM_FLAG_TYPE(uintx)>(env, thread, name);
1341 WB_END
1342 
1343 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))
1344   return GetVMFlag_longBox<JVM_FLAG_TYPE(uint64_t)>(env, thread, name);
1345 WB_END
1346 
1347 WB_ENTRY(jobject, WB_GetSizeTVMFlag(JNIEnv* env, jobject o, jstring name))
1348   return GetVMFlag_longBox<JVM_FLAG_TYPE(size_t)>(env, thread, name);
1349 WB_END
1350 
1351 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))
1352   double result;
1353   if (GetVMFlag <JVM_FLAG_TYPE(double)> (thread, env, name, &result)) {
1354     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1355     return doubleBox(thread, env, result);
1356   }
1357   return nullptr;
1358 WB_END
1359 
1360 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))
1361   ccstr ccstrResult;
1362   if (GetVMFlag <JVM_FLAG_TYPE(ccstr)> (thread, env, name, &ccstrResult)) {
1363     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1364     jstring result = env->NewStringUTF(ccstrResult);
1365     CHECK_JNI_EXCEPTION_(env, nullptr);
1366     return result;
1367   }
1368   return nullptr;
1369 WB_END
1370 
1371 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))
1372   bool result = value == JNI_TRUE ? true : false;
1373   SetVMFlag <JVM_FLAG_TYPE(bool)> (thread, env, name, &result);
1374 WB_END
1375 
1376 WB_ENTRY(void, WB_SetIntVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1377   int result = value;
1378   SetVMFlag <JVM_FLAG_TYPE(int)> (thread, env, name, &result);
1379 WB_END
1380 
1381 WB_ENTRY(void, WB_SetUintVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1382   uint result = value;
1383   SetVMFlag <JVM_FLAG_TYPE(uint)> (thread, env, name, &result);
1384 WB_END
1385 
1386 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1387   intx result = value;
1388   SetVMFlag <JVM_FLAG_TYPE(intx)> (thread, env, name, &result);
1389 WB_END
1390 
1391 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1392   uintx result = value;
1393   SetVMFlag <JVM_FLAG_TYPE(uintx)> (thread, env, name, &result);
1394 WB_END
1395 
1396 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1397   uint64_t result = value;
1398   SetVMFlag <JVM_FLAG_TYPE(uint64_t)> (thread, env, name, &result);
1399 WB_END
1400 
1401 WB_ENTRY(void, WB_SetSizeTVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
1402   size_t result = value;
1403   SetVMFlag <JVM_FLAG_TYPE(size_t)> (thread, env, name, &result);
1404 WB_END
1405 
1406 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))
1407   double result = value;
1408   SetVMFlag <JVM_FLAG_TYPE(double)> (thread, env, name, &result);
1409 WB_END
1410 
1411 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))
1412   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
1413   const char* ccstrValue;
1414   if (value == nullptr) {
1415     ccstrValue = nullptr;
1416   }
1417   else {
1418     ccstrValue = env->GetStringUTFChars(value, nullptr);
1419     CHECK_JNI_EXCEPTION(env);
1420   }
1421   {
1422     ccstr param = ccstrValue;
1423     ThreadInVMfromNative ttvfn(thread); // back to VM
1424     if (SetVMFlag <JVM_FLAG_TYPE(ccstr)> (thread, env, name, &param)) {
1425       assert(param == nullptr, "old value is freed automatically and not returned");
1426     }
1427   }
1428   if (value != nullptr) {
1429     env->ReleaseStringUTFChars(value, ccstrValue);
1430   }
1431 WB_END
1432 
1433 WB_ENTRY(void, WB_LockCompilation(JNIEnv* env, jobject o, jlong timeout))
1434   WhiteBox::compilation_locked = true;
1435 WB_END
1436 
1437 WB_ENTRY(void, WB_UnlockCompilation(JNIEnv* env, jobject o))
1438   MonitorLocker mo(Compilation_lock, Mutex::_no_safepoint_check_flag);
1439   WhiteBox::compilation_locked = false;
1440   mo.notify_all();
1441 WB_END
1442 
1443 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
1444   ResourceMark rm(THREAD);
1445   int len;
1446   jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
1447   return (StringTable::lookup(name, len) != nullptr);
1448 WB_END
1449 
1450 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
1451   Universe::heap()->soft_ref_policy()->set_should_clear_all_soft_refs(true);
1452   Universe::heap()->collect(GCCause::_wb_full_gc);
1453 #if INCLUDE_G1GC
1454   if (UseG1GC) {
1455     // Needs to be cleared explicitly for G1
1456     Universe::heap()->soft_ref_policy()->set_should_clear_all_soft_refs(false);
1457   }
1458 #endif // INCLUDE_G1GC
1459 WB_END
1460 
1461 WB_ENTRY(void, WB_YoungGC(JNIEnv* env, jobject o))
1462   Universe::heap()->collect(GCCause::_wb_young_gc);
1463 WB_END
1464 
1465 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
1466   // static+volatile in order to force the read to happen
1467   // (not be eliminated by the compiler)
1468   static char c;
1469   static volatile char* p;
1470 
1471   p = os::reserve_memory(os::vm_allocation_granularity());
1472   if (p == nullptr) {
1473     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
1474   }
1475 
1476   c = *p;
1477 WB_END
1478 
1479 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
1480   const char* features = VM_Version::features_string();
1481   ThreadToNativeFromVM ttn(thread);
1482   jstring features_string = env->NewStringUTF(features);
1483 
1484   CHECK_JNI_EXCEPTION_(env, nullptr);
1485 
1486   return features_string;
1487 WB_END
1488 
1489 CodeBlobType WhiteBox::get_blob_type(const CodeBlob* code) {
1490   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
1491   return CodeCache::get_code_heap(code)->code_blob_type();
1492 }
1493 
1494 CodeHeap* WhiteBox::get_code_heap(CodeBlobType blob_type) {
1495   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
1496   return CodeCache::get_code_heap(blob_type);
1497 }
1498 
1499 struct CodeBlobStub {
1500   CodeBlobStub(const CodeBlob* blob) :
1501       name(os::strdup(blob->name())),
1502       size(blob->size()),
1503       blob_type(static_cast<jint>(WhiteBox::get_blob_type(blob))),
1504       address((jlong) blob) { }
1505   ~CodeBlobStub() { os::free((void*) name); }
1506   const char* const name;
1507   const jint        size;
1508   const jint        blob_type;
1509   const jlong       address;
1510 };
1511 
1512 static jobjectArray codeBlob2objectArray(JavaThread* thread, JNIEnv* env, CodeBlobStub* cb) {
1513   ResourceMark rm;
1514   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
1515   CHECK_JNI_EXCEPTION_(env, nullptr);
1516   jobjectArray result = env->NewObjectArray(4, clazz, nullptr);
1517 
1518   jstring name = env->NewStringUTF(cb->name);
1519   CHECK_JNI_EXCEPTION_(env, nullptr);
1520   env->SetObjectArrayElement(result, 0, name);
1521 
1522   jobject obj = integerBox(thread, env, cb->size);
1523   CHECK_JNI_EXCEPTION_(env, nullptr);
1524   env->SetObjectArrayElement(result, 1, obj);
1525 
1526   obj = integerBox(thread, env, cb->blob_type);
1527   CHECK_JNI_EXCEPTION_(env, nullptr);
1528   env->SetObjectArrayElement(result, 2, obj);
1529 
1530   obj = longBox(thread, env, cb->address);
1531   CHECK_JNI_EXCEPTION_(env, nullptr);
1532   env->SetObjectArrayElement(result, 3, obj);
1533 
1534   return result;
1535 }
1536 
1537 WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
1538   ResourceMark rm(THREAD);
1539   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1540   CHECK_JNI_EXCEPTION_(env, nullptr);
1541   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
1542   CompiledMethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
1543   jobjectArray result = nullptr;
1544   if (code == nullptr) {
1545     return result;
1546   }
1547   int comp_level = code->comp_level();
1548   int insts_size = code->insts_size();
1549 
1550   ThreadToNativeFromVM ttn(thread);
1551   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
1552   CHECK_JNI_EXCEPTION_(env, nullptr);
1553   result = env->NewObjectArray(5, clazz, nullptr);
1554   if (result == nullptr) {
1555     return result;
1556   }
1557 
1558   CodeBlobStub stub(code);
1559   jobjectArray codeBlob = codeBlob2objectArray(thread, env, &stub);
1560   CHECK_JNI_EXCEPTION_(env, nullptr);
1561   env->SetObjectArrayElement(result, 0, codeBlob);
1562 
1563   jobject level = integerBox(thread, env, comp_level);
1564   CHECK_JNI_EXCEPTION_(env, nullptr);
1565   env->SetObjectArrayElement(result, 1, level);
1566 
1567   jbyteArray insts = env->NewByteArray(insts_size);
1568   CHECK_JNI_EXCEPTION_(env, nullptr);
1569   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
1570   env->SetObjectArrayElement(result, 2, insts);
1571 
1572   jobject id = integerBox(thread, env, code->compile_id());
1573   CHECK_JNI_EXCEPTION_(env, nullptr);
1574   env->SetObjectArrayElement(result, 3, id);
1575 
1576   jobject entry_point = longBox(thread, env, (jlong) code->entry_point());
1577   CHECK_JNI_EXCEPTION_(env, nullptr);
1578   env->SetObjectArrayElement(result, 4, entry_point);
1579 
1580   return result;
1581 WB_END
1582 
1583 CodeBlob* WhiteBox::allocate_code_blob(int size, CodeBlobType blob_type) {
1584   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
1585   BufferBlob* blob;
1586   int full_size = CodeBlob::align_code_offset(sizeof(BufferBlob));
1587   if (full_size < size) {
1588     full_size += align_up(size - full_size, oopSize);
1589   }
1590   {
1591     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1592     blob = (BufferBlob*) CodeCache::allocate(full_size, blob_type);
1593     if (blob != nullptr) {
1594       ::new (blob) BufferBlob("WB::DummyBlob", full_size);
1595     }
1596   }
1597   // Track memory usage statistic after releasing CodeCache_lock
1598   MemoryService::track_code_cache_memory_usage();
1599   return blob;
1600 }
1601 
1602 WB_ENTRY(jlong, WB_AllocateCodeBlob(JNIEnv* env, jobject o, jint size, jint blob_type))
1603   if (size < 0) {
1604     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1605       err_msg("WB_AllocateCodeBlob: size is negative: " INT32_FORMAT, size));
1606   }
1607   return (jlong) WhiteBox::allocate_code_blob(size, static_cast<CodeBlobType>(blob_type));
1608 WB_END
1609 
1610 WB_ENTRY(void, WB_FreeCodeBlob(JNIEnv* env, jobject o, jlong addr))
1611   if (addr == 0) {
1612     return;
1613   }
1614   BufferBlob::free((BufferBlob*) addr);
1615 WB_END
1616 
1617 WB_ENTRY(jobjectArray, WB_GetCodeHeapEntries(JNIEnv* env, jobject o, jint blob_type))
1618   ResourceMark rm;
1619   GrowableArray<CodeBlobStub*> blobs;
1620   {
1621     MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1622     CodeHeap* heap = WhiteBox::get_code_heap(static_cast<CodeBlobType>(blob_type));
1623     if (heap == nullptr) {
1624       return nullptr;
1625     }
1626     for (CodeBlob* cb = (CodeBlob*) heap->first();
1627          cb != nullptr; cb = (CodeBlob*) heap->next(cb)) {
1628       CodeBlobStub* stub = NEW_RESOURCE_OBJ(CodeBlobStub);
1629       new (stub) CodeBlobStub(cb);
1630       blobs.append(stub);
1631     }
1632   }
1633   ThreadToNativeFromVM ttn(thread);
1634   jobjectArray result = nullptr;
1635   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
1636   CHECK_JNI_EXCEPTION_(env, nullptr);
1637   result = env->NewObjectArray(blobs.length(), clazz, nullptr);
1638   CHECK_JNI_EXCEPTION_(env, nullptr);
1639   if (result == nullptr) {
1640     return result;
1641   }
1642   int i = 0;
1643   for (GrowableArrayIterator<CodeBlobStub*> it = blobs.begin();
1644        it != blobs.end(); ++it) {
1645     jobjectArray obj = codeBlob2objectArray(thread, env, *it);
1646     CHECK_JNI_EXCEPTION_(env, nullptr);
1647     env->SetObjectArrayElement(result, i, obj);
1648     CHECK_JNI_EXCEPTION_(env, nullptr);
1649     ++i;
1650   }
1651   return result;
1652 WB_END
1653 
1654 WB_ENTRY(jint, WB_GetCompilationActivityMode(JNIEnv* env, jobject o))
1655   return CompileBroker::get_compilation_activity_mode();
1656 WB_END
1657 
1658 WB_ENTRY(jobjectArray, WB_GetCodeBlob(JNIEnv* env, jobject o, jlong addr))
1659   if (addr == 0) {
1660     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
1661       "WB_GetCodeBlob: addr is null");
1662   }
1663   ThreadToNativeFromVM ttn(thread);
1664   CodeBlobStub stub((CodeBlob*) addr);
1665   return codeBlob2objectArray(thread, env, &stub);
1666 WB_END
1667 
1668 WB_ENTRY(jlong, WB_GetMethodData(JNIEnv* env, jobject wv, jobject method))
1669   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1670   CHECK_JNI_EXCEPTION_(env, 0);
1671   methodHandle mh(thread, Method::checked_resolve_jmethod_id(jmid));
1672   return (jlong) mh->method_data();
1673 WB_END
1674 
1675 WB_ENTRY(jlong, WB_GetThreadStackSize(JNIEnv* env, jobject o))
1676   return (jlong) thread->stack_size();
1677 WB_END
1678 
1679 WB_ENTRY(jlong, WB_GetThreadRemainingStackSize(JNIEnv* env, jobject o))
1680   return (jlong) thread->stack_overflow_state()->stack_available(
1681                    os::current_stack_pointer()) - (jlong)StackOverflow::stack_shadow_zone_size();
1682 WB_END
1683 
1684 
1685 int WhiteBox::array_bytes_to_length(size_t bytes) {
1686   return Array<u1>::bytes_to_length(bytes);
1687 }
1688 
1689 ///////////////
1690 // MetaspaceTestContext and MetaspaceTestArena
1691 WB_ENTRY(jlong, WB_CreateMetaspaceTestContext(JNIEnv* env, jobject wb, jlong commit_limit, jlong reserve_limit))
1692   metaspace::MetaspaceTestContext* context =
1693       new metaspace::MetaspaceTestContext("whitebox-metaspace-context", (size_t) commit_limit, (size_t) reserve_limit);
1694   return (jlong)p2i(context);
1695 WB_END
1696 
1697 WB_ENTRY(void, WB_DestroyMetaspaceTestContext(JNIEnv* env, jobject wb, jlong context))
1698   delete (metaspace::MetaspaceTestContext*) context;
1699 WB_END
1700 
1701 WB_ENTRY(void, WB_PurgeMetaspaceTestContext(JNIEnv* env, jobject wb, jlong context))
1702   metaspace::MetaspaceTestContext* context0 = (metaspace::MetaspaceTestContext*) context;
1703   context0->purge_area();
1704 WB_END
1705 
1706 WB_ENTRY(void, WB_PrintMetaspaceTestContext(JNIEnv* env, jobject wb, jlong context))
1707   metaspace::MetaspaceTestContext* context0 = (metaspace::MetaspaceTestContext*) context;
1708   context0->print_on(tty);
1709 WB_END
1710 
1711 WB_ENTRY(jlong, WB_GetTotalCommittedWordsInMetaspaceTestContext(JNIEnv* env, jobject wb, jlong context))
1712   metaspace::MetaspaceTestContext* context0 = (metaspace::MetaspaceTestContext*) context;
1713   return context0->committed_words();
1714 WB_END
1715 
1716 WB_ENTRY(jlong, WB_GetTotalUsedWordsInMetaspaceTestContext(JNIEnv* env, jobject wb, jlong context))
1717   metaspace::MetaspaceTestContext* context0 = (metaspace::MetaspaceTestContext*) context;
1718   return context0->used_words();
1719 WB_END
1720 
1721 WB_ENTRY(jlong, WB_CreateArenaInTestContext(JNIEnv* env, jobject wb, jlong context, jboolean is_micro))
1722   const Metaspace::MetaspaceType type = is_micro ? Metaspace::ReflectionMetaspaceType : Metaspace::StandardMetaspaceType;
1723   metaspace::MetaspaceTestContext* context0 = (metaspace::MetaspaceTestContext*) context;
1724   return (jlong)p2i(context0->create_arena(type));
1725 WB_END
1726 
1727 WB_ENTRY(void, WB_DestroyMetaspaceTestArena(JNIEnv* env, jobject wb, jlong arena))
1728   delete (metaspace::MetaspaceTestArena*) arena;
1729 WB_END
1730 
1731 WB_ENTRY(jlong, WB_AllocateFromMetaspaceTestArena(JNIEnv* env, jobject wb, jlong arena, jlong word_size))
1732   metaspace::MetaspaceTestArena* arena0 = (metaspace::MetaspaceTestArena*) arena;
1733   MetaWord* p = arena0->allocate((size_t) word_size);
1734   return (jlong)p2i(p);
1735 WB_END
1736 
1737 WB_ENTRY(void, WB_DeallocateToMetaspaceTestArena(JNIEnv* env, jobject wb, jlong arena, jlong p, jlong word_size))
1738   metaspace::MetaspaceTestArena* arena0 = (metaspace::MetaspaceTestArena*) arena;
1739   arena0->deallocate((MetaWord*)p, (size_t) word_size);
1740 WB_END
1741 
1742 WB_ENTRY(jlong, WB_GetMaxMetaspaceAllocationSize(JNIEnv* env, jobject wb))
1743   return (jlong) Metaspace::max_allocation_word_size() * BytesPerWord;
1744 WB_END
1745 
1746 //////////////
1747 
1748 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))
1749   if (size < 0) {
1750     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1751         err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));
1752   }
1753 
1754   oop class_loader_oop = JNIHandles::resolve(class_loader);
1755   ClassLoaderData* cld = class_loader_oop != nullptr
1756       ? java_lang_ClassLoader::loader_data_acquire(class_loader_oop)
1757       : ClassLoaderData::the_null_class_loader_data();
1758 
1759   void* metadata = MetadataFactory::new_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
1760 
1761   return (jlong)(uintptr_t)metadata;
1762 WB_END
1763 
1764 WB_ENTRY(void, WB_DefineModule(JNIEnv* env, jobject o, jobject module, jboolean is_open,
1765                                 jstring version, jstring location, jobjectArray packages))
1766   Handle h_module (THREAD, JNIHandles::resolve(module));
1767   Modules::define_module(h_module, is_open, version, location, packages, CHECK);
1768 WB_END
1769 
1770 WB_ENTRY(void, WB_AddModuleExports(JNIEnv* env, jobject o, jobject from_module, jstring package, jobject to_module))
1771   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1772   Handle h_to_module (THREAD, JNIHandles::resolve(to_module));
1773   Modules::add_module_exports_qualified(h_from_module, package, h_to_module, CHECK);
1774 WB_END
1775 
1776 WB_ENTRY(void, WB_AddModuleExportsToAllUnnamed(JNIEnv* env, jobject o, jclass module, jstring package))
1777   Handle h_module (THREAD, JNIHandles::resolve(module));
1778   Modules::add_module_exports_to_all_unnamed(h_module, package, CHECK);
1779 WB_END
1780 
1781 WB_ENTRY(void, WB_AddModuleExportsToAll(JNIEnv* env, jobject o, jclass module, jstring package))
1782   Handle h_module (THREAD, JNIHandles::resolve(module));
1783   Modules::add_module_exports(h_module, package, Handle(), CHECK);
1784 WB_END
1785 
1786 WB_ENTRY(void, WB_AddReadsModule(JNIEnv* env, jobject o, jobject from_module, jobject source_module))
1787   Handle h_from_module (THREAD, JNIHandles::resolve(from_module));
1788   Handle h_source_module (THREAD, JNIHandles::resolve(source_module));
1789   Modules::add_reads_module(h_from_module, h_source_module, CHECK);
1790 WB_END
1791 
1792 WB_ENTRY(jlong, WB_IncMetaspaceCapacityUntilGC(JNIEnv* env, jobject wb, jlong inc))
1793   if (inc < 0) {
1794     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1795         err_msg("WB_IncMetaspaceCapacityUntilGC: inc is negative: " JLONG_FORMAT, inc));
1796   }
1797 
1798   jlong max_size_t = (jlong) ((size_t) -1);
1799   if (inc > max_size_t) {
1800     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1801         err_msg("WB_IncMetaspaceCapacityUntilGC: inc does not fit in size_t: " JLONG_FORMAT, inc));
1802   }
1803 
1804   size_t new_cap_until_GC = 0;
1805   size_t aligned_inc = align_down((size_t) inc, Metaspace::commit_alignment());
1806   bool success = MetaspaceGC::inc_capacity_until_GC(aligned_inc, &new_cap_until_GC);
1807   if (!success) {
1808     THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(),
1809                 "WB_IncMetaspaceCapacityUntilGC: could not increase capacity until GC "
1810                 "due to contention with another thread");
1811   }
1812   return (jlong) new_cap_until_GC;
1813 WB_END
1814 
1815 WB_ENTRY(jlong, WB_MetaspaceCapacityUntilGC(JNIEnv* env, jobject wb))
1816   return (jlong) MetaspaceGC::capacity_until_GC();
1817 WB_END
1818 
1819 // The function is only valid when CDS is available.
1820 WB_ENTRY(jlong, WB_MetaspaceSharedRegionAlignment(JNIEnv* env, jobject wb))
1821 #if INCLUDE_CDS
1822   return (jlong)MetaspaceShared::core_region_alignment();
1823 #else
1824   ShouldNotReachHere();
1825   return 0L;
1826 #endif
1827 WB_END
1828 
1829 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))
1830   oop obj_oop = JNIHandles::resolve(obj);
1831   return (jboolean) obj_oop->mark().has_monitor();
1832 WB_END
1833 
1834 WB_ENTRY(jboolean, WB_DeflateIdleMonitors(JNIEnv* env, jobject wb))
1835   log_info(monitorinflation)("WhiteBox initiated DeflateIdleMonitors");
1836   return ObjectSynchronizer::request_deflate_idle_monitors_from_wb();
1837 WB_END
1838 
1839 WB_ENTRY(void, WB_ForceSafepoint(JNIEnv* env, jobject wb))
1840   VM_ForceSafepoint force_safepoint_op;
1841   VMThread::execute(&force_safepoint_op);
1842 WB_END
1843 
1844 WB_ENTRY(void, WB_ForceClassLoaderStatsSafepoint(JNIEnv* env, jobject wb))
1845   nullStream dev_null;
1846   ClassLoaderStatsVMOperation force_op(&dev_null);
1847   VMThread::execute(&force_op);
1848 WB_END
1849 
1850 WB_ENTRY(jlong, WB_GetConstantPool(JNIEnv* env, jobject wb, jclass klass))
1851   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1852   return (jlong) ik->constants();
1853 WB_END
1854 
1855 WB_ENTRY(jint, WB_GetConstantPoolCacheIndexTag(JNIEnv* env, jobject wb))
1856   return ConstantPool::CPCACHE_INDEX_TAG;
1857 WB_END
1858 
1859 WB_ENTRY(jint, WB_GetConstantPoolCacheLength(JNIEnv* env, jobject wb, jclass klass))
1860   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1861   ConstantPool* cp = ik->constants();
1862   if (cp->cache() == nullptr) {
1863       return -1;
1864   }
1865   return cp->cache()->length();
1866 WB_END
1867 
1868 WB_ENTRY(jobjectArray, WB_GetResolvedReferences(JNIEnv* env, jobject wb, jclass klass))
1869   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1870   objArrayOop resolved_refs= ik->constants()->resolved_references();
1871   return (jobjectArray)JNIHandles::make_local(THREAD, resolved_refs);
1872 WB_END
1873 
1874 WB_ENTRY(jint, WB_ConstantPoolRemapInstructionOperandFromCache(JNIEnv* env, jobject wb, jclass klass, jint index))
1875   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1876   ConstantPool* cp = ik->constants();
1877   if (cp->cache() == nullptr) {
1878     THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(), "Constant pool does not have a cache");
1879   }
1880   jint cpci = index;
1881   jint cpciTag = ConstantPool::CPCACHE_INDEX_TAG;
1882   if (cpciTag > cpci || cpci >= cp->cache()->length() + cpciTag) {
1883     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(), "Constant pool cache index is out of range");
1884   }
1885   jint cpi = cp->remap_instruction_operand_from_cache(cpci);
1886   return cpi;
1887 WB_END
1888 
1889 WB_ENTRY(jint, WB_ConstantPoolEncodeIndyIndex(JNIEnv* env, jobject wb, jint index))
1890   return ConstantPool::encode_invokedynamic_index(index);
1891 WB_END
1892 
1893 WB_ENTRY(jint, WB_getIndyInfoLength(JNIEnv* env, jobject wb, jclass klass))
1894   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1895   ConstantPool* cp = ik->constants();
1896   if (cp->cache() == nullptr) {
1897       return -1;
1898   }
1899   return cp->resolved_indy_entries_length();
1900 WB_END
1901 
1902 WB_ENTRY(jint, WB_getIndyCPIndex(JNIEnv* env, jobject wb, jclass klass, jint index))
1903   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
1904   ConstantPool* cp = ik->constants();
1905   if (cp->cache() == nullptr) {
1906       return -1;
1907   }
1908   return cp->resolved_indy_entry_at(index)->constant_pool_index();
1909 WB_END
1910 
1911 WB_ENTRY(void, WB_ClearInlineCaches(JNIEnv* env, jobject wb, jboolean preserve_static_stubs))
1912   VM_ClearICs clear_ics(preserve_static_stubs == JNI_TRUE);
1913   VMThread::execute(&clear_ics);
1914 WB_END
1915 
1916 template <typename T>
1917 static bool GetMethodOption(JavaThread* thread, JNIEnv* env, jobject method, jstring name, T* value) {
1918   assert(value != nullptr, "sanity");
1919   if (method == nullptr || name == nullptr) {
1920     return false;
1921   }
1922   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
1923   CHECK_JNI_EXCEPTION_(env, false);
1924   methodHandle mh(thread, Method::checked_resolve_jmethod_id(jmid));
1925   // can't be in VM when we call JNI
1926   ThreadToNativeFromVM ttnfv(thread);
1927   const char* flag_name = env->GetStringUTFChars(name, nullptr);
1928   CHECK_JNI_EXCEPTION_(env, false);
1929   enum CompileCommand option = CompilerOracle::string_to_option(flag_name);
1930   env->ReleaseStringUTFChars(name, flag_name);
1931   if (option == CompileCommand::Unknown) {
1932     return false;
1933   }
1934   if (!CompilerOracle::option_matches_type(option, *value)) {
1935     return false;
1936   }
1937   return CompilerOracle::has_option_value(mh, option, *value);
1938 }
1939 
1940 WB_ENTRY(jobject, WB_GetMethodBooleaneOption(JNIEnv* env, jobject wb, jobject method, jstring name))
1941   bool result;
1942   if (GetMethodOption<bool> (thread, env, method, name, &result)) {
1943     // can't be in VM when we call JNI
1944     ThreadToNativeFromVM ttnfv(thread);
1945     return booleanBox(thread, env, result);
1946   }
1947   return nullptr;
1948 WB_END
1949 
1950 WB_ENTRY(jobject, WB_GetMethodIntxOption(JNIEnv* env, jobject wb, jobject method, jstring name))
1951   intx result;
1952   if (GetMethodOption <intx> (thread, env, method, name, &result)) {
1953     // can't be in VM when we call JNI
1954     ThreadToNativeFromVM ttnfv(thread);
1955     return longBox(thread, env, result);
1956   }
1957   return nullptr;
1958 WB_END
1959 
1960 WB_ENTRY(jobject, WB_GetMethodUintxOption(JNIEnv* env, jobject wb, jobject method, jstring name))
1961   uintx result;
1962   if (GetMethodOption <uintx> (thread, env, method, name, &result)) {
1963     // can't be in VM when we call JNI
1964     ThreadToNativeFromVM ttnfv(thread);
1965     return longBox(thread, env, result);
1966   }
1967   return nullptr;
1968 WB_END
1969 
1970 WB_ENTRY(jobject, WB_GetMethodDoubleOption(JNIEnv* env, jobject wb, jobject method, jstring name))
1971   double result;
1972   if (GetMethodOption <double> (thread, env, method, name, &result)) {
1973     // can't be in VM when we call JNI
1974     ThreadToNativeFromVM ttnfv(thread);
1975     return doubleBox(thread, env, result);
1976   }
1977   return nullptr;
1978 WB_END
1979 
1980 WB_ENTRY(jobject, WB_GetMethodStringOption(JNIEnv* env, jobject wb, jobject method, jstring name))
1981   ccstr ccstrResult;
1982   if (GetMethodOption <ccstr> (thread, env, method, name, &ccstrResult)) {
1983     // can't be in VM when we call JNI
1984     ThreadToNativeFromVM ttnfv(thread);
1985     jstring result = env->NewStringUTF(ccstrResult);
1986     CHECK_JNI_EXCEPTION_(env, nullptr);
1987     return result;
1988   }
1989   return nullptr;
1990 WB_END
1991 
1992 WB_ENTRY(jobject, WB_GetDefaultArchivePath(JNIEnv* env, jobject wb))
1993   const char* p = Arguments::get_default_shared_archive_path();
1994   ThreadToNativeFromVM ttn(thread);
1995   jstring path_string = env->NewStringUTF(p);
1996 
1997   CHECK_JNI_EXCEPTION_(env, nullptr);
1998 
1999   return path_string;
2000 WB_END
2001 
2002 WB_ENTRY(jboolean, WB_IsSharingEnabled(JNIEnv* env, jobject wb))
2003   return UseSharedSpaces;
2004 WB_END
2005 
2006 WB_ENTRY(jint, WB_GetCDSGenericHeaderMinVersion(JNIEnv* env, jobject wb))
2007 #if INCLUDE_CDS
2008   return (jint)CDS_GENERIC_HEADER_SUPPORTED_MIN_VERSION;
2009 #else
2010   ShouldNotReachHere();
2011   return (jint)-1;
2012 #endif
2013 WB_END
2014 
2015 WB_ENTRY(jint, WB_GetCDSCurrentVersion(JNIEnv* env, jobject wb))
2016 #if INCLUDE_CDS
2017   return (jint)CURRENT_CDS_ARCHIVE_VERSION;
2018 #else
2019   ShouldNotReachHere();
2020   return (jint)-1;
2021 #endif
2022 WB_END
2023 
2024 WB_ENTRY(jboolean, WB_CDSMemoryMappingFailed(JNIEnv* env, jobject wb))
2025   return FileMapInfo::memory_mapping_failed();
2026 WB_END
2027 
2028 WB_ENTRY(jboolean, WB_IsSharedInternedString(JNIEnv* env, jobject wb, jobject str))
2029   ResourceMark rm(THREAD);
2030   oop str_oop = JNIHandles::resolve(str);
2031   int length;
2032   jchar* chars = java_lang_String::as_unicode_string(str_oop, length, CHECK_(false));
2033   return StringTable::lookup_shared(chars, length) == str_oop;
2034 WB_END
2035 
2036 WB_ENTRY(jboolean, WB_IsSharedClass(JNIEnv* env, jobject wb, jclass clazz))
2037   return (jboolean)MetaspaceShared::is_in_shared_metaspace(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));
2038 WB_END
2039 
2040 WB_ENTRY(jboolean, WB_AreSharedStringsMapped(JNIEnv* env))
2041   return ArchiveHeapLoader::is_mapped();
2042 WB_END
2043 
2044 WB_ENTRY(void, WB_LinkClass(JNIEnv* env, jobject wb, jclass clazz))
2045   Klass *k = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz));
2046   if (!k->is_instance_klass()) {
2047     return;
2048   }
2049   InstanceKlass *ik = InstanceKlass::cast(k);
2050   ik->link_class(THREAD); // may throw verification error
2051 WB_END
2052 
2053 WB_ENTRY(jboolean, WB_AreOpenArchiveHeapObjectsMapped(JNIEnv* env))
2054   return ArchiveHeapLoader::is_mapped();
2055 WB_END
2056 
2057 WB_ENTRY(jboolean, WB_IsCDSIncluded(JNIEnv* env))
2058 #if INCLUDE_CDS
2059   return true;
2060 #else
2061   return false;
2062 #endif // INCLUDE_CDS
2063 WB_END
2064 
2065 WB_ENTRY(jboolean, WB_isC2OrJVMCIIncluded(JNIEnv* env))
2066 #if COMPILER2_OR_JVMCI
2067   return true;
2068 #else
2069   return false;
2070 #endif
2071 WB_END
2072 
2073 WB_ENTRY(jboolean, WB_IsJVMCISupportedByGC(JNIEnv* env))
2074 #if INCLUDE_JVMCI
2075   return JVMCIGlobals::gc_supports_jvmci();
2076 #else
2077   return false;
2078 #endif
2079 WB_END
2080 
2081 WB_ENTRY(jboolean, WB_CanWriteJavaHeapArchive(JNIEnv* env))
2082   return HeapShared::can_write();
2083 WB_END
2084 
2085 
2086 WB_ENTRY(jboolean, WB_IsJFRIncluded(JNIEnv* env))
2087 #if INCLUDE_JFR
2088   return true;
2089 #else
2090   return false;
2091 #endif // INCLUDE_JFR
2092 WB_END
2093 
2094 WB_ENTRY(jboolean, WB_IsDTraceIncluded(JNIEnv* env))
2095 #if defined(DTRACE_ENABLED)
2096   return true;
2097 #else
2098   return false;
2099 #endif // DTRACE_ENABLED
2100 WB_END
2101 
2102 #if INCLUDE_CDS
2103 
2104 WB_ENTRY(jint, WB_GetCDSOffsetForName(JNIEnv* env, jobject o, jstring name))
2105   ResourceMark rm;
2106   char* c_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2107   jint result = (jint)CDSConstants::get_cds_offset(c_name);
2108   return result;
2109 WB_END
2110 
2111 WB_ENTRY(jint, WB_GetCDSConstantForName(JNIEnv* env, jobject o, jstring name))
2112   ResourceMark rm;
2113   char* c_name = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(name));
2114   jint result = (jint)CDSConstants::get_cds_constant(c_name);
2115   return result;
2116 WB_END
2117 
2118 #endif // INCLUDE_CDS
2119 
2120 WB_ENTRY(jboolean, WB_HandshakeReadMonitors(JNIEnv* env, jobject wb, jobject thread_handle))
2121   class ReadMonitorsClosure : public HandshakeClosure {
2122     jboolean _executed;
2123 
2124     void do_thread(Thread* th) {
2125       JavaThread* jt = JavaThread::cast(th);
2126       ResourceMark rm;
2127 
2128       GrowableArray<MonitorInfo*>* info = new GrowableArray<MonitorInfo*>();
2129 
2130       if (!jt->has_last_Java_frame()) {
2131         return;
2132       }
2133       RegisterMap rmap(jt,
2134                        RegisterMap::UpdateMap::include,
2135                        RegisterMap::ProcessFrames::include,
2136                        RegisterMap::WalkContinuation::skip);
2137       for (javaVFrame* vf = jt->last_java_vframe(&rmap); vf != nullptr; vf = vf->java_sender()) {
2138         GrowableArray<MonitorInfo*> *monitors = vf->monitors();
2139         if (monitors != nullptr) {
2140           int len = monitors->length();
2141           // Walk monitors youngest to oldest
2142           for (int i = len - 1; i >= 0; i--) {
2143             MonitorInfo* mon_info = monitors->at(i);
2144             if (mon_info->eliminated()) continue;
2145             oop owner = mon_info->owner();
2146             if (owner != nullptr) {
2147               info->append(mon_info);
2148             }
2149           }
2150         }
2151       }
2152       _executed = true;
2153     }
2154 
2155    public:
2156     ReadMonitorsClosure() : HandshakeClosure("WB_HandshakeReadMonitors"), _executed(false) {}
2157     jboolean executed() const { return _executed; }
2158   };
2159 
2160   ReadMonitorsClosure rmc;
2161   if (thread_handle != nullptr) {
2162     ThreadsListHandle tlh;
2163     JavaThread* target = nullptr;
2164     bool is_alive = tlh.cv_internal_thread_to_JavaThread(thread_handle, &target, nullptr);
2165     if (is_alive) {
2166       Handshake::execute(&rmc, &tlh, target);
2167     }
2168   }
2169   return rmc.executed();
2170 WB_END
2171 
2172 WB_ENTRY(jint, WB_HandshakeWalkStack(JNIEnv* env, jobject wb, jobject thread_handle, jboolean all_threads))
2173   class TraceSelfClosure : public HandshakeClosure {
2174     jint _num_threads_completed;
2175 
2176     void do_thread(Thread* th) {
2177       JavaThread* jt = JavaThread::cast(th);
2178       ResourceMark rm;
2179 
2180       jt->print_on(tty);
2181       jt->print_stack_on(tty);
2182       tty->cr();
2183       Atomic::inc(&_num_threads_completed);
2184     }
2185 
2186   public:
2187     TraceSelfClosure(Thread* thread) : HandshakeClosure("WB_TraceSelf"), _num_threads_completed(0) {}
2188 
2189     jint num_threads_completed() const { return _num_threads_completed; }
2190   };
2191   TraceSelfClosure tsc(Thread::current());
2192 
2193   if (all_threads) {
2194     Handshake::execute(&tsc);
2195   } else if (thread_handle != nullptr) {
2196     ThreadsListHandle tlh;
2197     JavaThread* target = nullptr;
2198     bool is_alive = tlh.cv_internal_thread_to_JavaThread(thread_handle, &target, nullptr);
2199     if (is_alive) {
2200       Handshake::execute(&tsc, &tlh, target);
2201     }
2202   }
2203   return tsc.num_threads_completed();
2204 WB_END
2205 
2206 WB_ENTRY(void, WB_AsyncHandshakeWalkStack(JNIEnv* env, jobject wb, jobject thread_handle))
2207   class TraceSelfClosure : public AsyncHandshakeClosure {
2208     JavaThread* _self;
2209     void do_thread(Thread* th) {
2210       assert(th->is_Java_thread(), "sanity");
2211       // AsynchHandshake handshakes are only executed by target.
2212       assert(_self == th, "Must be");
2213       assert(Thread::current() == th, "Must be");
2214       JavaThread* jt = JavaThread::cast(th);
2215       ResourceMark rm;
2216       jt->print_on(tty);
2217       jt->print_stack_on(tty);
2218       tty->cr();
2219     }
2220 
2221   public:
2222     TraceSelfClosure(JavaThread* self_target) : AsyncHandshakeClosure("WB_TraceSelf"), _self(self_target) {}
2223   };
2224   if (thread_handle != nullptr) {
2225     ThreadsListHandle tlh;
2226     JavaThread* target = nullptr;
2227     bool is_alive = tlh.cv_internal_thread_to_JavaThread(thread_handle, &target, nullptr);
2228     if (is_alive) {
2229       TraceSelfClosure* tsc = new TraceSelfClosure(target);
2230       Handshake::execute(tsc, target);
2231     }
2232   }
2233 WB_END
2234 
2235 static volatile int _emulated_lock = 0;
2236 
2237 WB_ENTRY(void, WB_LockAndBlock(JNIEnv* env, jobject wb, jboolean suspender))
2238   JavaThread* self = JavaThread::current();
2239 
2240   {
2241     // Before trying to acquire the lock transition into a safepoint safe state.
2242     // Otherwise if either suspender or suspendee blocks for a safepoint
2243     // in ~ThreadBlockInVM the other one could loop forever trying to acquire
2244     // the lock without allowing the safepoint to progress.
2245     ThreadBlockInVM tbivm(self);
2246 
2247     // We will deadlock here if we are 'suspender' and 'suspendee'
2248     // suspended in ~ThreadBlockInVM. This verifies we only suspend
2249     // at the right place.
2250     while (Atomic::cmpxchg(&_emulated_lock, 0, 1) != 0) {}
2251     assert(_emulated_lock == 1, "Must be locked");
2252 
2253     // Sleep much longer in suspendee to force situation where
2254     // 'suspender' is waiting above to acquire lock.
2255     os::naked_short_sleep(suspender ? 1 : 10);
2256   }
2257   Atomic::store(&_emulated_lock, 0);
2258 WB_END
2259 
2260 // Some convenience methods to deal with objects from java
2261 int WhiteBox::offset_for_field(const char* field_name, oop object,
2262     Symbol* signature_symbol) {
2263   assert(field_name != nullptr && strlen(field_name) > 0, "Field name not valid");
2264 
2265   //Get the class of our object
2266   Klass* arg_klass = object->klass();
2267   //Turn it into an instance-klass
2268   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
2269 
2270   //Create symbols to look for in the class
2271   TempNewSymbol name_symbol = SymbolTable::new_symbol(field_name);
2272 
2273   //To be filled in with an offset of the field we're looking for
2274   fieldDescriptor fd;
2275 
2276   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
2277   if (res == nullptr) {
2278     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
2279         name_symbol->as_C_string());
2280     vm_exit_during_initialization("Invalid layout of preloaded class: use -Xlog:class+load=info to see the origin of the problem class");
2281   }
2282 
2283   //fetch the field at the offset we've found
2284   int dest_offset = fd.offset();
2285 
2286   return dest_offset;
2287 }
2288 
2289 
2290 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
2291   int offset = offset_for_field(field_name, object,
2292       vmSymbols::string_signature());
2293   oop string = object->obj_field(offset);
2294   if (string == nullptr) {
2295     return nullptr;
2296   }
2297   const char* ret = java_lang_String::as_utf8_string(string);
2298   return ret;
2299 }
2300 
2301 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
2302   int offset =
2303       offset_for_field(field_name, object, vmSymbols::bool_signature());
2304   bool ret = (object->bool_field(offset) == JNI_TRUE);
2305   return ret;
2306 }
2307 
2308 void WhiteBox::register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread, JNINativeMethod* method_array, int method_count) {
2309   ResourceMark rm;
2310   Klass* klass = java_lang_Class::as_Klass(JNIHandles::resolve_non_null(wbclass));
2311   const char* klass_name = klass->external_name();
2312 
2313   ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
2314 
2315   //  one by one registration natives for exception catching
2316   jclass no_such_method_error_klass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
2317   CHECK_JNI_EXCEPTION(env);
2318   for (int i = 0, n = method_count; i < n; ++i) {
2319     // Skip dummy entries
2320     if (method_array[i].fnPtr == nullptr) continue;
2321     if (env->RegisterNatives(wbclass, &method_array[i], 1) != 0) {
2322       jthrowable throwable_obj = env->ExceptionOccurred();
2323       if (throwable_obj != nullptr) {
2324         env->ExceptionClear();
2325         if (env->IsInstanceOf(throwable_obj, no_such_method_error_klass)) {
2326           // NoSuchMethodError is thrown when a method can't be found or a method is not native.
2327           // Ignoring the exception since it is not preventing use of other WhiteBox methods.
2328           tty->print_cr("Warning: 'NoSuchMethodError' on register of %s::%s%s",
2329               klass_name, method_array[i].name, method_array[i].signature);
2330         }
2331       } else {
2332         // Registration failed unexpectedly.
2333         tty->print_cr("Warning: unexpected error on register of %s::%s%s. All methods will be unregistered",
2334             klass_name, method_array[i].name, method_array[i].signature);
2335         env->UnregisterNatives(wbclass);
2336         break;
2337       }
2338     }
2339   }
2340 }
2341 
2342 WB_ENTRY(jint, WB_AddCompilerDirective(JNIEnv* env, jobject o, jstring compDirect))
2343   // can't be in VM when we call JNI
2344   ThreadToNativeFromVM ttnfv(thread);
2345   const char* dir = env->GetStringUTFChars(compDirect, nullptr);
2346   CHECK_JNI_EXCEPTION_(env, 0);
2347   int ret;
2348   {
2349     ThreadInVMfromNative ttvfn(thread); // back to VM
2350     ret = DirectivesParser::parse_string(dir, tty);
2351   }
2352   env->ReleaseStringUTFChars(compDirect, dir);
2353   // -1 for error parsing directive. Return 0 as number of directives added.
2354   if (ret == -1) {
2355     ret = 0;
2356   }
2357   return (jint) ret;
2358 WB_END
2359 
2360 WB_ENTRY(void, WB_RemoveCompilerDirective(JNIEnv* env, jobject o, jint count))
2361   DirectivesStack::pop(count);
2362 WB_END
2363 
2364 // Checks that the library libfile has the noexecstack bit set.
2365 WB_ENTRY(jboolean, WB_CheckLibSpecifiesNoexecstack(JNIEnv* env, jobject o, jstring libfile))
2366   jboolean ret = false;
2367 #ifdef LINUX
2368   // Can't be in VM when we call JNI.
2369   ThreadToNativeFromVM ttnfv(thread);
2370   const char* lf = env->GetStringUTFChars(libfile, nullptr);
2371   CHECK_JNI_EXCEPTION_(env, 0);
2372   ret = (jboolean) ElfFile::specifies_noexecstack(lf);
2373   env->ReleaseStringUTFChars(libfile, lf);
2374 #endif
2375   return ret;
2376 WB_END
2377 
2378 WB_ENTRY(jboolean, WB_IsContainerized(JNIEnv* env, jobject o))
2379   LINUX_ONLY(return OSContainer::is_containerized();)
2380   return false;
2381 WB_END
2382 
2383 // Physical memory of the host machine (including containers)
2384 WB_ENTRY(jlong, WB_HostPhysicalMemory(JNIEnv* env, jobject o))
2385   LINUX_ONLY(return os::Linux::physical_memory();)
2386   return os::physical_memory();
2387 WB_END
2388 
2389 // Physical swap of the host machine (including containers), Linux only.
2390 WB_ENTRY(jlong, WB_HostPhysicalSwap(JNIEnv* env, jobject o))
2391   LINUX_ONLY(return (jlong)os::Linux::host_swap();)
2392   return -1; // Not used/implemented on other platforms
2393 WB_END
2394 
2395 WB_ENTRY(jint, WB_ValidateCgroup(JNIEnv* env,
2396                                     jobject o,
2397                                     jstring proc_cgroups,
2398                                     jstring proc_self_cgroup,
2399                                     jstring proc_self_mountinfo))
2400   jint ret = 0;
2401 #ifdef LINUX
2402   ThreadToNativeFromVM ttnfv(thread);
2403   const char* p_cgroups = env->GetStringUTFChars(proc_cgroups, nullptr);
2404   CHECK_JNI_EXCEPTION_(env, 0);
2405   const char* p_s_cgroup = env->GetStringUTFChars(proc_self_cgroup, nullptr);
2406   CHECK_JNI_EXCEPTION_(env, 0);
2407   const char* p_s_mountinfo = env->GetStringUTFChars(proc_self_mountinfo, nullptr);
2408   CHECK_JNI_EXCEPTION_(env, 0);
2409   u1 cg_type_flags = 0;
2410   // This sets cg_type_flags
2411   WhiteBox::validate_cgroup(p_cgroups, p_s_cgroup, p_s_mountinfo, &cg_type_flags);
2412   ret = (jint)cg_type_flags;
2413   env->ReleaseStringUTFChars(proc_cgroups, p_cgroups);
2414   env->ReleaseStringUTFChars(proc_self_cgroup, p_s_cgroup);
2415   env->ReleaseStringUTFChars(proc_self_mountinfo, p_s_mountinfo);
2416 #endif
2417   return ret;
2418 WB_END
2419 
2420 WB_ENTRY(void, WB_PrintOsInfo(JNIEnv* env, jobject o))
2421   os::print_os_info(tty);
2422 WB_END
2423 
2424 // Elf decoder
2425 WB_ENTRY(void, WB_DisableElfSectionCache(JNIEnv* env))
2426 #if !defined(_WINDOWS) && !defined(__APPLE__) && !defined(_AIX)
2427   ElfFile::_do_not_cache_elf_section = true;
2428 #endif
2429 WB_END
2430 
2431 WB_ENTRY(jlong, WB_ResolvedMethodItemsCount(JNIEnv* env, jobject o))
2432   return (jlong) ResolvedMethodTable::items_count();
2433 WB_END
2434 
2435 WB_ENTRY(jint, WB_ProtectionDomainRemovedCount(JNIEnv* env, jobject o))
2436   return (jint) ProtectionDomainCacheTable::removed_entries_count();
2437 WB_END
2438 
2439 WB_ENTRY(jint, WB_GetKlassMetadataSize(JNIEnv* env, jobject wb, jclass mirror))
2440   Klass* k = java_lang_Class::as_Klass(JNIHandles::resolve(mirror));
2441   // Return size in bytes.
2442   return k->size() * wordSize;
2443 WB_END
2444 
2445 // See test/hotspot/jtreg/runtime/Thread/ThreadObjAccessAtExit.java.
2446 // It explains how the thread's priority field is used for test state coordination.
2447 //
2448 WB_ENTRY(void, WB_CheckThreadObjOfTerminatingThread(JNIEnv* env, jobject wb, jobject target_handle))
2449   oop target_oop = JNIHandles::resolve_non_null(target_handle);
2450   jlong tid = java_lang_Thread::thread_id(target_oop);
2451   JavaThread* target = java_lang_Thread::thread(target_oop);
2452 
2453   // Grab a ThreadsListHandle to protect the target thread whilst terminating
2454   ThreadsListHandle tlh;
2455 
2456   // Look up the target thread by tid to ensure it is present
2457   JavaThread* t = tlh.list()->find_JavaThread_from_java_tid(tid);
2458   if (t == nullptr) {
2459     THROW_MSG(vmSymbols::java_lang_RuntimeException(), "Target thread not found in ThreadsList!");
2460   }
2461 
2462   tty->print_cr("WB_CheckThreadObjOfTerminatingThread: target thread is protected");
2463   // Allow target to terminate by boosting priority
2464   java_lang_Thread::set_priority(t->threadObj(), ThreadPriority(NormPriority + 1));
2465 
2466   // Now wait for the target to terminate
2467   while (!target->is_terminated()) {
2468     ThreadBlockInVM tbivm(thread);  // just in case target is involved in a safepoint
2469     os::naked_short_sleep(0);
2470   }
2471 
2472   tty->print_cr("WB_CheckThreadObjOfTerminatingThread: target thread is terminated");
2473 
2474   // Now release the GC inducing thread - we have to re-resolve the external oop that
2475   // was passed in as GC may have occurred and we don't know if we can trust t->threadObj() now.
2476   oop original = JNIHandles::resolve_non_null(target_handle);
2477   java_lang_Thread::set_priority(original, ThreadPriority(NormPriority + 2));
2478 
2479   tty->print_cr("WB_CheckThreadObjOfTerminatingThread: GC has been initiated - checking threadObj:");
2480 
2481   // The Java code should be creating garbage and triggering GC, which would potentially move
2482   // the threadObj oop. If the exiting thread is properly protected then its threadObj should
2483   // remain valid and equal to our initial target_handle. Loop a few times to give GC a chance to
2484   // kick in.
2485   for (int i = 0; i < 5; i++) {
2486     oop original = JNIHandles::resolve_non_null(target_handle);
2487     oop current = t->threadObj();
2488     if (original != current) {
2489       tty->print_cr("WB_CheckThreadObjOfTerminatingThread: failed comparison on iteration %d", i);
2490       THROW_MSG(vmSymbols::java_lang_RuntimeException(), "Target thread oop has changed!");
2491     } else {
2492       tty->print_cr("WB_CheckThreadObjOfTerminatingThread: successful comparison on iteration %d", i);
2493       ThreadBlockInVM tbivm(thread);
2494       os::naked_short_sleep(50);
2495     }
2496   }
2497 WB_END
2498 
2499 WB_ENTRY(void, WB_VerifyFrames(JNIEnv* env, jobject wb, jboolean log, jboolean update_map))
2500   ResourceMark rm; // for verify
2501   stringStream st;
2502   for (StackFrameStream fst(JavaThread::current(), update_map, true); !fst.is_done(); fst.next()) {
2503     frame* current_frame = fst.current();
2504     if (log) {
2505       current_frame->print_value_on(&st, nullptr);
2506     }
2507     current_frame->verify(fst.register_map());
2508   }
2509   if (log) {
2510     tty->print_cr("[WhiteBox::VerifyFrames] Walking Frames");
2511     tty->print_raw(st.freeze());
2512     tty->print_cr("[WhiteBox::VerifyFrames] Done");
2513   }
2514 WB_END
2515 
2516 WB_ENTRY(jboolean, WB_IsJVMTIIncluded(JNIEnv* env, jobject wb))
2517 #if INCLUDE_JVMTI
2518   return JNI_TRUE;
2519 #else
2520   return JNI_FALSE;
2521 #endif
2522 WB_END
2523 
2524 WB_ENTRY(void, WB_WaitUnsafe(JNIEnv* env, jobject wb, jint time))
2525     os::naked_short_sleep(time);
2526 WB_END
2527 
2528 WB_ENTRY(jstring, WB_GetLibcName(JNIEnv* env, jobject o))
2529   ThreadToNativeFromVM ttn(thread);
2530   jstring info_string = env->NewStringUTF(XSTR(LIBC));
2531   CHECK_JNI_EXCEPTION_(env, nullptr);
2532   return info_string;
2533 WB_END
2534 
2535 WB_ENTRY(void, WB_LockCritical(JNIEnv* env, jobject wb))
2536   GCLocker::lock_critical(thread);
2537 WB_END
2538 
2539 WB_ENTRY(void, WB_UnlockCritical(JNIEnv* env, jobject wb))
2540   GCLocker::unlock_critical(thread);
2541 WB_END
2542 
2543 WB_ENTRY(jboolean, WB_SetVirtualThreadsNotifyJvmtiMode(JNIEnv* env, jobject wb, jboolean enable))
2544   if (!Continuations::enabled()) {
2545     tty->print_cr("WB error: must be Continuations::enabled()!");
2546     return JNI_FALSE;
2547   }
2548   jboolean result = false;
2549 #if INCLUDE_JVMTI
2550   if (enable) {
2551     result = JvmtiEnvBase::enable_virtual_threads_notify_jvmti();
2552   } else {
2553     result = JvmtiEnvBase::disable_virtual_threads_notify_jvmti();
2554   }
2555 #endif
2556   return result;
2557 WB_END
2558 
2559 WB_ENTRY(void, WB_PreTouchMemory(JNIEnv* env, jobject wb, jlong addr, jlong size))
2560   void* const from = (void*)addr;
2561   void* const to = (void*)(addr + size);
2562   if (from > to) {
2563     os::pretouch_memory(from, to, os::vm_page_size());
2564   }
2565 WB_END
2566 
2567 WB_ENTRY(void, WB_CleanMetaspaces(JNIEnv* env, jobject target))
2568   ClassLoaderDataGraph::safepoint_and_clean_metaspaces();
2569 WB_END
2570 
2571 #define CC (char*)
2572 
2573 static JNINativeMethod methods[] = {
2574   {CC"getObjectAddress0",                CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
2575   {CC"getObjectSize0",                   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },
2576   {CC"isObjectInOldGen0",                CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen  },
2577   {CC"getHeapOopSize",                   CC"()I",                   (void*)&WB_GetHeapOopSize    },
2578   {CC"getVMPageSize",                    CC"()I",                   (void*)&WB_GetVMPageSize     },
2579   {CC"getVMAllocationGranularity",       CC"()J",                   (void*)&WB_GetVMAllocationGranularity },
2580   {CC"getVMLargePageSize",               CC"()J",                   (void*)&WB_GetVMLargePageSize},
2581   {CC"getHeapSpaceAlignment",            CC"()J",                   (void*)&WB_GetHeapSpaceAlignment},
2582   {CC"getHeapAlignment",                 CC"()J",                   (void*)&WB_GetHeapAlignment},
2583   {CC"countAliveClasses0",               CC"(Ljava/lang/String;)I", (void*)&WB_CountAliveClasses },
2584   {CC"getSymbolRefcount",                CC"(Ljava/lang/String;)I", (void*)&WB_GetSymbolRefcount },
2585   {CC"parseCommandLine0",
2586       CC"(Ljava/lang/String;C[Ljdk/test/whitebox/parser/DiagnosticCommand;)[Ljava/lang/Object;",
2587       (void*) &WB_ParseCommandLine
2588   },
2589   {CC"addToBootstrapClassLoaderSearch0", CC"(Ljava/lang/String;)V",
2590                                                       (void*)&WB_AddToBootstrapClassLoaderSearch},
2591   {CC"addToSystemClassLoaderSearch0",    CC"(Ljava/lang/String;)V",
2592                                                       (void*)&WB_AddToSystemClassLoaderSearch},
2593   {CC"getCompressedOopsMaxHeapSize", CC"()J",
2594       (void*)&WB_GetCompressedOopsMaxHeapSize},
2595   {CC"printHeapSizes",     CC"()V",                   (void*)&WB_PrintHeapSizes    },
2596   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
2597   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
2598 #if INCLUDE_CDS
2599   {CC"getCDSOffsetForName0", CC"(Ljava/lang/String;)I",  (void*)&WB_GetCDSOffsetForName},
2600   {CC"getCDSConstantForName0", CC"(Ljava/lang/String;)I",  (void*)&WB_GetCDSConstantForName},
2601 #endif
2602 #if INCLUDE_G1GC
2603   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
2604   {CC"g1CompletedConcurrentMarkCycles", CC"()I",      (void*)&WB_G1CompletedConcurrentMarkCycles},
2605   {CC"g1IsHumongous0",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
2606   {CC"g1BelongsToHumongousRegion0", CC"(J)Z",         (void*)&WB_G1BelongsToHumongousRegion},
2607   {CC"g1BelongsToFreeRegion0", CC"(J)Z",              (void*)&WB_G1BelongsToFreeRegion},
2608   {CC"g1NumMaxRegions",    CC"()J",                   (void*)&WB_G1NumMaxRegions  },
2609   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },
2610   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },
2611   {CC"g1HasRegionsToUncommit",  CC"()Z",              (void*)&WB_G1HasRegionsToUncommit},
2612   {CC"g1AuxiliaryMemoryUsage", CC"()Ljava/lang/management/MemoryUsage;",
2613                                                       (void*)&WB_G1AuxiliaryMemoryUsage  },
2614   {CC"g1ActiveMemoryNodeCount", CC"()I",              (void*)&WB_G1ActiveMemoryNodeCount },
2615   {CC"g1MemoryNodeIds",    CC"()[I",                  (void*)&WB_G1MemoryNodeIds },
2616   {CC"g1GetMixedGCInfo",   CC"(I)[J",                 (void*)&WB_G1GetMixedGCInfo },
2617 #endif // INCLUDE_G1GC
2618 #if INCLUDE_PARALLELGC
2619   {CC"psVirtualSpaceAlignment",CC"()J",               (void*)&WB_PSVirtualSpaceAlignment},
2620   {CC"psHeapGenerationAlignment",CC"()J",             (void*)&WB_PSHeapGenerationAlignment},
2621 #endif
2622   {CC"NMTMalloc",           CC"(J)J",                 (void*)&WB_NMTMalloc          },
2623   {CC"NMTMallocWithPseudoStack", CC"(JI)J",           (void*)&WB_NMTMallocWithPseudoStack},
2624   {CC"NMTMallocWithPseudoStackAndType", CC"(JII)J",   (void*)&WB_NMTMallocWithPseudoStackAndType},
2625   {CC"NMTFree",             CC"(J)V",                 (void*)&WB_NMTFree            },
2626   {CC"NMTReserveMemory",    CC"(J)J",                 (void*)&WB_NMTReserveMemory   },
2627   {CC"NMTAttemptReserveMemoryAt",    CC"(JJ)J",       (void*)&WB_NMTAttemptReserveMemoryAt },
2628   {CC"NMTCommitMemory",     CC"(JJ)V",                (void*)&WB_NMTCommitMemory    },
2629   {CC"NMTUncommitMemory",   CC"(JJ)V",                (void*)&WB_NMTUncommitMemory  },
2630   {CC"NMTReleaseMemory",    CC"(JJ)V",                (void*)&WB_NMTReleaseMemory   },
2631   {CC"NMTGetHashSize",      CC"()I",                  (void*)&WB_NMTGetHashSize     },
2632   {CC"NMTNewArena",         CC"(J)J",                 (void*)&WB_NMTNewArena        },
2633   {CC"NMTFreeArena",        CC"(J)V",                 (void*)&WB_NMTFreeArena       },
2634   {CC"NMTArenaMalloc",      CC"(JJ)V",                (void*)&WB_NMTArenaMalloc     },
2635   {CC"deoptimizeFrames",   CC"(Z)I",                  (void*)&WB_DeoptimizeFrames  },
2636   {CC"isFrameDeoptimized", CC"(I)Z",                  (void*)&WB_IsFrameDeoptimized},
2637   {CC"deoptimizeAll",      CC"()V",                   (void*)&WB_DeoptimizeAll     },
2638   {CC"deoptimizeMethod0",   CC"(Ljava/lang/reflect/Executable;Z)I",
2639                                                       (void*)&WB_DeoptimizeMethod  },
2640   {CC"isMethodCompiled0",   CC"(Ljava/lang/reflect/Executable;Z)Z",
2641                                                       (void*)&WB_IsMethodCompiled  },
2642   {CC"isMethodCompilable0", CC"(Ljava/lang/reflect/Executable;IZ)Z",
2643                                                       (void*)&WB_IsMethodCompilable},
2644   {CC"isMethodQueuedForCompilation0",
2645       CC"(Ljava/lang/reflect/Executable;)Z",          (void*)&WB_IsMethodQueuedForCompilation},
2646   {CC"isIntrinsicAvailable0",
2647       CC"(Ljava/lang/reflect/Executable;Ljava/lang/reflect/Executable;I)Z",
2648                                                       (void*)&WB_IsIntrinsicAvailable},
2649   {CC"makeMethodNotCompilable0",
2650       CC"(Ljava/lang/reflect/Executable;IZ)V",        (void*)&WB_MakeMethodNotCompilable},
2651   {CC"testSetDontInlineMethod0",
2652       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetDontInlineMethod},
2653   {CC"getMethodCompilationLevel0",
2654       CC"(Ljava/lang/reflect/Executable;Z)I",         (void*)&WB_GetMethodCompilationLevel},
2655   {CC"getMethodDecompileCount0",
2656       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodDecompileCount},
2657   {CC"getMethodTrapCount0",
2658       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)I",
2659                                                       (void*)&WB_GetMethodTrapCount},
2660   {CC"getDeoptCount0",
2661       CC"(Ljava/lang/String;Ljava/lang/String;)I",    (void*)&WB_GetDeoptCount},
2662   {CC"getMethodEntryBci0",
2663       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodEntryBci},
2664   {CC"getCompileQueueSize",
2665       CC"(I)I",                                       (void*)&WB_GetCompileQueueSize},
2666   {CC"testSetForceInlineMethod0",
2667       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetForceInlineMethod},
2668   {CC"enqueueMethodForCompilation0",
2669       CC"(Ljava/lang/reflect/Executable;II)Z",        (void*)&WB_EnqueueMethodForCompilation},
2670   {CC"enqueueInitializerForCompilation0",
2671       CC"(Ljava/lang/Class;I)Z",                      (void*)&WB_EnqueueInitializerForCompilation},
2672   {CC"markMethodProfiled",
2673       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_MarkMethodProfiled},
2674   {CC"clearMethodState0",
2675       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_ClearMethodState},
2676   {CC"lockCompilation",    CC"()V",                   (void*)&WB_LockCompilation},
2677   {CC"unlockCompilation",  CC"()V",                   (void*)&WB_UnlockCompilation},
2678   {CC"matchesMethod",
2679       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)I",
2680                                                       (void*)&WB_MatchesMethod},
2681   {CC"matchesInline",
2682       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)I",
2683                                                       (void*)&WB_MatchesInline},
2684   {CC"shouldPrintAssembly",
2685         CC"(Ljava/lang/reflect/Executable;I)Z",
2686                                                         (void*)&WB_ShouldPrintAssembly},
2687 
2688   {CC"isConstantVMFlag",   CC"(Ljava/lang/String;)Z", (void*)&WB_IsConstantVMFlag},
2689   {CC"isDefaultVMFlag",    CC"(Ljava/lang/String;)Z", (void*)&WB_IsDefaultVMFlag},
2690   {CC"isLockedVMFlag",     CC"(Ljava/lang/String;)Z", (void*)&WB_IsLockedVMFlag},
2691   {CC"setBooleanVMFlag",   CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},
2692   {CC"setIntVMFlag",       CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntVMFlag},
2693   {CC"setUintVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintVMFlag},
2694   {CC"setIntxVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},
2695   {CC"setUintxVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},
2696   {CC"setUint64VMFlag",    CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},
2697   {CC"setSizeTVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetSizeTVMFlag},
2698   {CC"setDoubleVMFlag",    CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},
2699   {CC"setStringVMFlag",    CC"(Ljava/lang/String;Ljava/lang/String;)V",
2700                                                       (void*)&WB_SetStringVMFlag},
2701   {CC"getBooleanVMFlag",   CC"(Ljava/lang/String;)Ljava/lang/Boolean;",
2702                                                       (void*)&WB_GetBooleanVMFlag},
2703   {CC"getIntVMFlag",       CC"(Ljava/lang/String;)Ljava/lang/Long;",
2704                                                       (void*)&WB_GetIntVMFlag},
2705   {CC"getUintVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",
2706                                                       (void*)&WB_GetUintVMFlag},
2707   {CC"getIntxVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",
2708                                                       (void*)&WB_GetIntxVMFlag},
2709   {CC"getUintxVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
2710                                                       (void*)&WB_GetUintxVMFlag},
2711   {CC"getUint64VMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Long;",
2712                                                       (void*)&WB_GetUint64VMFlag},
2713   {CC"getSizeTVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
2714                                                       (void*)&WB_GetSizeTVMFlag},
2715   {CC"getDoubleVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Double;",
2716                                                       (void*)&WB_GetDoubleVMFlag},
2717   {CC"getStringVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/String;",
2718                                                       (void*)&WB_GetStringVMFlag},
2719   {CC"isInStringTable",    CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable  },
2720   {CC"fullGC",   CC"()V",                             (void*)&WB_FullGC },
2721   {CC"youngGC",  CC"()V",                             (void*)&WB_YoungGC },
2722   {CC"readReservedMemory", CC"()V",                   (void*)&WB_ReadReservedMemory },
2723   {CC"allocateMetaspace",
2724      CC"(Ljava/lang/ClassLoader;J)J",                 (void*)&WB_AllocateMetaspace },
2725   {CC"incMetaspaceCapacityUntilGC", CC"(J)J",         (void*)&WB_IncMetaspaceCapacityUntilGC },
2726   {CC"metaspaceCapacityUntilGC", CC"()J",             (void*)&WB_MetaspaceCapacityUntilGC },
2727   {CC"metaspaceSharedRegionAlignment", CC"()J",       (void*)&WB_MetaspaceSharedRegionAlignment },
2728   {CC"getCPUFeatures",     CC"()Ljava/lang/String;",  (void*)&WB_GetCPUFeatures     },
2729   {CC"getNMethod0",         CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
2730                                                       (void*)&WB_GetNMethod         },
2731   {CC"allocateCodeBlob",   CC"(II)J",                 (void*)&WB_AllocateCodeBlob   },
2732   {CC"freeCodeBlob",       CC"(J)V",                  (void*)&WB_FreeCodeBlob       },
2733   {CC"getCodeHeapEntries", CC"(I)[Ljava/lang/Object;",(void*)&WB_GetCodeHeapEntries },
2734   {CC"getCompilationActivityMode",
2735                            CC"()I",                   (void*)&WB_GetCompilationActivityMode},
2736   {CC"getMethodData0",     CC"(Ljava/lang/reflect/Executable;)J",
2737                                                       (void*)&WB_GetMethodData      },
2738   {CC"getCodeBlob",        CC"(J)[Ljava/lang/Object;",(void*)&WB_GetCodeBlob        },
2739   {CC"getThreadStackSize", CC"()J",                   (void*)&WB_GetThreadStackSize },
2740   {CC"getThreadRemainingStackSize", CC"()J",          (void*)&WB_GetThreadRemainingStackSize },
2741   {CC"DefineModule",       CC"(Ljava/lang/Object;ZLjava/lang/String;Ljava/lang/String;[Ljava/lang/Object;)V",
2742                                                       (void*)&WB_DefineModule },
2743   {CC"AddModuleExports",   CC"(Ljava/lang/Object;Ljava/lang/String;Ljava/lang/Object;)V",
2744                                                       (void*)&WB_AddModuleExports },
2745   {CC"AddReadsModule",     CC"(Ljava/lang/Object;Ljava/lang/Object;)V",
2746                                                       (void*)&WB_AddReadsModule },
2747   {CC"AddModuleExportsToAllUnnamed", CC"(Ljava/lang/Object;Ljava/lang/String;)V",
2748                                                       (void*)&WB_AddModuleExportsToAllUnnamed },
2749   {CC"AddModuleExportsToAll", CC"(Ljava/lang/Object;Ljava/lang/String;)V",
2750                                                       (void*)&WB_AddModuleExportsToAll },
2751   {CC"deflateIdleMonitors", CC"()Z",                  (void*)&WB_DeflateIdleMonitors },
2752   {CC"isMonitorInflated0", CC"(Ljava/lang/Object;)Z", (void*)&WB_IsMonitorInflated  },
2753   {CC"forceSafepoint",     CC"()V",                   (void*)&WB_ForceSafepoint     },
2754   {CC"forceClassLoaderStatsSafepoint", CC"()V",       (void*)&WB_ForceClassLoaderStatsSafepoint },
2755   {CC"getConstantPool0",   CC"(Ljava/lang/Class;)J",  (void*)&WB_GetConstantPool    },
2756   {CC"getConstantPoolCacheIndexTag0", CC"()I",  (void*)&WB_GetConstantPoolCacheIndexTag},
2757   {CC"getConstantPoolCacheLength0", CC"(Ljava/lang/Class;)I",  (void*)&WB_GetConstantPoolCacheLength},
2758   {CC"getResolvedReferences0", CC"(Ljava/lang/Class;)[Ljava/lang/Object;", (void*)&WB_GetResolvedReferences},
2759   {CC"remapInstructionOperandFromCPCache0",
2760       CC"(Ljava/lang/Class;I)I",                      (void*)&WB_ConstantPoolRemapInstructionOperandFromCache},
2761   {CC"encodeConstantPoolIndyIndex0",
2762       CC"(I)I",                      (void*)&WB_ConstantPoolEncodeIndyIndex},
2763   {CC"getIndyInfoLength0", CC"(Ljava/lang/Class;)I",  (void*)&WB_getIndyInfoLength},
2764   {CC"getIndyCPIndex0",    CC"(Ljava/lang/Class;I)I", (void*)&WB_getIndyCPIndex},
2765   {CC"getMethodBooleanOption",
2766       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)Ljava/lang/Boolean;",
2767                                                       (void*)&WB_GetMethodBooleaneOption},
2768   {CC"getMethodIntxOption",
2769       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)Ljava/lang/Long;",
2770                                                       (void*)&WB_GetMethodIntxOption},
2771   {CC"getMethodUintxOption",
2772       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)Ljava/lang/Long;",
2773                                                       (void*)&WB_GetMethodUintxOption},
2774   {CC"getMethodDoubleOption",
2775       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)Ljava/lang/Double;",
2776                                                       (void*)&WB_GetMethodDoubleOption},
2777   {CC"getMethodStringOption",
2778       CC"(Ljava/lang/reflect/Executable;Ljava/lang/String;)Ljava/lang/String;",
2779                                                       (void*)&WB_GetMethodStringOption},
2780   {CC"getDefaultArchivePath",             CC"()Ljava/lang/String;",
2781                                                       (void*)&WB_GetDefaultArchivePath},
2782   {CC"getCDSGenericHeaderMinVersion",     CC"()I",    (void*)&WB_GetCDSGenericHeaderMinVersion},
2783   {CC"getCurrentCDSVersion",              CC"()I",    (void*)&WB_GetCDSCurrentVersion},
2784   {CC"isSharingEnabled",   CC"()Z",                   (void*)&WB_IsSharingEnabled},
2785   {CC"isSharedInternedString", CC"(Ljava/lang/String;)Z", (void*)&WB_IsSharedInternedString },
2786   {CC"isSharedClass",      CC"(Ljava/lang/Class;)Z",  (void*)&WB_IsSharedClass },
2787   {CC"areSharedStringsMapped",            CC"()Z",    (void*)&WB_AreSharedStringsMapped },
2788   {CC"linkClass",          CC"(Ljava/lang/Class;)V",  (void*)&WB_LinkClass},
2789   {CC"areOpenArchiveHeapObjectsMapped",   CC"()Z",    (void*)&WB_AreOpenArchiveHeapObjectsMapped},
2790   {CC"isCDSIncluded",                     CC"()Z",    (void*)&WB_IsCDSIncluded },
2791   {CC"isJFRIncluded",                     CC"()Z",    (void*)&WB_IsJFRIncluded },
2792   {CC"isDTraceIncluded",                  CC"()Z",    (void*)&WB_IsDTraceIncluded },
2793   {CC"isC2OrJVMCIIncluded",               CC"()Z",    (void*)&WB_isC2OrJVMCIIncluded },
2794   {CC"isJVMCISupportedByGC",              CC"()Z",    (void*)&WB_IsJVMCISupportedByGC},
2795   {CC"canWriteJavaHeapArchive",           CC"()Z",    (void*)&WB_CanWriteJavaHeapArchive },
2796   {CC"cdsMemoryMappingFailed",            CC"()Z",    (void*)&WB_CDSMemoryMappingFailed },
2797 
2798   {CC"clearInlineCaches0",  CC"(Z)V",                 (void*)&WB_ClearInlineCaches },
2799   {CC"handshakeReadMonitors", CC"(Ljava/lang/Thread;)Z", (void*)&WB_HandshakeReadMonitors },
2800   {CC"handshakeWalkStack", CC"(Ljava/lang/Thread;Z)I", (void*)&WB_HandshakeWalkStack },
2801   {CC"asyncHandshakeWalkStack", CC"(Ljava/lang/Thread;)V", (void*)&WB_AsyncHandshakeWalkStack },
2802   {CC"lockAndBlock", CC"(Z)V",                        (void*)&WB_LockAndBlock},
2803   {CC"checkThreadObjOfTerminatingThread", CC"(Ljava/lang/Thread;)V", (void*)&WB_CheckThreadObjOfTerminatingThread },
2804   {CC"verifyFrames",                CC"(ZZ)V",            (void*)&WB_VerifyFrames },
2805   {CC"addCompilerDirective",    CC"(Ljava/lang/String;)I",
2806                                                       (void*)&WB_AddCompilerDirective },
2807   {CC"removeCompilerDirective",   CC"(I)V",           (void*)&WB_RemoveCompilerDirective },
2808   {CC"isGCSupported",             CC"(I)Z",           (void*)&WB_IsGCSupported},
2809   {CC"isGCSupportedByJVMCICompiler", CC"(I)Z",        (void*)&WB_IsGCSupportedByJVMCICompiler},
2810   {CC"isGCSelected",              CC"(I)Z",           (void*)&WB_IsGCSelected},
2811   {CC"isGCSelectedErgonomically", CC"()Z",            (void*)&WB_IsGCSelectedErgonomically},
2812   {CC"supportsConcurrentGCBreakpoints", CC"()Z",      (void*)&WB_SupportsConcurrentGCBreakpoints},
2813   {CC"concurrentGCAcquireControl0", CC"()V",          (void*)&WB_ConcurrentGCAcquireControl},
2814   {CC"concurrentGCReleaseControl0", CC"()V",          (void*)&WB_ConcurrentGCReleaseControl},
2815   {CC"concurrentGCRunToIdle0",    CC"()V",            (void*)&WB_ConcurrentGCRunToIdle},
2816   {CC"concurrentGCRunTo0",        CC"(Ljava/lang/String;)Z",
2817                                                       (void*)&WB_ConcurrentGCRunTo},
2818   {CC"checkLibSpecifiesNoexecstack", CC"(Ljava/lang/String;)Z",
2819                                                       (void*)&WB_CheckLibSpecifiesNoexecstack},
2820   {CC"isContainerized",           CC"()Z",            (void*)&WB_IsContainerized },
2821   {CC"validateCgroup",
2822       CC"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I",
2823                                                       (void*)&WB_ValidateCgroup },
2824   {CC"hostPhysicalMemory",        CC"()J",            (void*)&WB_HostPhysicalMemory },
2825   {CC"hostPhysicalSwap",          CC"()J",            (void*)&WB_HostPhysicalSwap },
2826   {CC"printOsInfo",               CC"()V",            (void*)&WB_PrintOsInfo },
2827   {CC"disableElfSectionCache",    CC"()V",            (void*)&WB_DisableElfSectionCache },
2828   {CC"resolvedMethodItemsCount",  CC"()J",            (void*)&WB_ResolvedMethodItemsCount },
2829   {CC"protectionDomainRemovedCount",   CC"()I",       (void*)&WB_ProtectionDomainRemovedCount },
2830   {CC"getKlassMetadataSize", CC"(Ljava/lang/Class;)I",(void*)&WB_GetKlassMetadataSize},
2831 
2832   {CC"createMetaspaceTestContext", CC"(JJ)J",         (void*)&WB_CreateMetaspaceTestContext},
2833   {CC"destroyMetaspaceTestContext", CC"(J)V",         (void*)&WB_DestroyMetaspaceTestContext},
2834   {CC"purgeMetaspaceTestContext", CC"(J)V",           (void*)&WB_PurgeMetaspaceTestContext},
2835   {CC"printMetaspaceTestContext", CC"(J)V",           (void*)&WB_PrintMetaspaceTestContext},
2836   {CC"getTotalCommittedWordsInMetaspaceTestContext", CC"(J)J",(void*)&WB_GetTotalCommittedWordsInMetaspaceTestContext},
2837   {CC"getTotalUsedWordsInMetaspaceTestContext", CC"(J)J", (void*)&WB_GetTotalUsedWordsInMetaspaceTestContext},
2838   {CC"createArenaInTestContext", CC"(JZ)J",           (void*)&WB_CreateArenaInTestContext},
2839   {CC"destroyMetaspaceTestArena", CC"(J)V",           (void*)&WB_DestroyMetaspaceTestArena},
2840   {CC"allocateFromMetaspaceTestArena", CC"(JJ)J",     (void*)&WB_AllocateFromMetaspaceTestArena},
2841   {CC"deallocateToMetaspaceTestArena", CC"(JJJ)V",    (void*)&WB_DeallocateToMetaspaceTestArena},
2842   {CC"maxMetaspaceAllocationSize", CC"()J",           (void*)&WB_GetMaxMetaspaceAllocationSize},
2843 
2844   {CC"isJVMTIIncluded", CC"()Z",                      (void*)&WB_IsJVMTIIncluded},
2845   {CC"waitUnsafe", CC"(I)V",                          (void*)&WB_WaitUnsafe},
2846   {CC"getLibcName",     CC"()Ljava/lang/String;",     (void*)&WB_GetLibcName},
2847 
2848   {CC"lockCritical",    CC"()V",                      (void*)&WB_LockCritical},
2849   {CC"unlockCritical",  CC"()V",                      (void*)&WB_UnlockCritical},
2850   {CC"setVirtualThreadsNotifyJvmtiMode", CC"(Z)Z",    (void*)&WB_SetVirtualThreadsNotifyJvmtiMode},
2851   {CC"preTouchMemory",  CC"(JJ)V",                    (void*)&WB_PreTouchMemory},
2852   {CC"cleanMetaspaces", CC"()V",                      (void*)&WB_CleanMetaspaces},
2853 };
2854 
2855 
2856 #undef CC
2857 
2858 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
2859   {
2860     if (WhiteBoxAPI) {
2861       // Make sure that wbclass is loaded by the null classloader
2862       InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(wbclass)));
2863       Handle loader(THREAD, ik->class_loader());
2864       if (loader.is_null()) {
2865         WhiteBox::register_methods(env, wbclass, thread, methods, sizeof(methods) / sizeof(methods[0]));
2866         WhiteBox::set_used();
2867       }
2868     }
2869   }
2870 JVM_END