1 /*
   2  * Copyright (c) 2012, 2019, 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 
  27 #include "memory/metadataFactory.hpp"
  28 #include "memory/metaspaceShared.hpp"
  29 #include "memory/iterator.hpp"
  30 #include "memory/universe.hpp"
  31 #include "oops/oop.inline.hpp"
  32 
  33 #include "classfile/symbolTable.hpp"
  34 #include "classfile/classLoaderData.hpp"
  35 
  36 #include "prims/whitebox.hpp"
  37 #include "prims/wbtestmethods/parserTests.hpp"
  38 
  39 #include "runtime/arguments.hpp"
  40 #include "runtime/interfaceSupport.hpp"
  41 #include "runtime/os.hpp"
  42 #include "utilities/array.hpp"
  43 #include "utilities/align.hpp"
  44 #include "utilities/debug.hpp"
  45 #include "utilities/macros.hpp"
  46 #include "utilities/exceptions.hpp"
  47 
  48 #if INCLUDE_ALL_GCS
  49 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
  50 #include "gc_implementation/g1/concurrentMark.hpp"
  51 #include "gc_implementation/g1/concurrentMarkThread.hpp"
  52 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  53 #include "gc_implementation/g1/heapRegionRemSet.hpp"
  54 #endif // INCLUDE_ALL_GCS
  55 
  56 #if INCLUDE_NMT
  57 #include "services/mallocSiteTable.hpp"
  58 #include "services/memTracker.hpp"
  59 #include "utilities/nativeCallStack.hpp"
  60 #endif // INCLUDE_NMT
  61 
  62 #include "compiler/compileBroker.hpp"
  63 #include "jvmtifiles/jvmtiEnv.hpp"
  64 #include "runtime/compilationPolicy.hpp"
  65 
  66 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
  67 
  68 #define SIZE_T_MAX_VALUE ((size_t) -1)
  69 
  70 bool WhiteBox::_used = false;
  71 
  72 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
  73   return (jlong)(void*)JNIHandles::resolve(obj);
  74 WB_END
  75 
  76 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
  77   return heapOopSize;
  78 WB_END
  79 
  80 WB_ENTRY(jint, WB_GetVMPageSize(JNIEnv* env, jobject o))
  81   return os::vm_page_size();
  82 WB_END
  83 
  84 WB_ENTRY(jlong, WB_GetVMLargePageSize(JNIEnv* env, jobject o))
  85   return os::large_page_size();
  86 WB_END
  87 
  88 class WBIsKlassAliveClosure : public KlassClosure {
  89     Symbol* _name;
  90     bool _found;
  91 public:
  92     WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
  93 
  94     void do_klass(Klass* k) {
  95       if (_found) return;
  96       Symbol* ksym = k->name();
  97       if (ksym->fast_compare(_name) == 0) {
  98         _found = true;
  99       }
 100     }
 101 
 102     bool found() const {
 103         return _found;
 104     }
 105 };
 106 
 107 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
 108   Handle h_name = JNIHandles::resolve(name);
 109   if (h_name.is_null()) return false;
 110   Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
 111   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
 112 
 113   WBIsKlassAliveClosure closure(sym);
 114   ClassLoaderDataGraph::classes_do(&closure);
 115 
 116   return closure.found();
 117 WB_END
 118 
 119 WB_ENTRY(jboolean, WB_ClassKnownToNotExist(JNIEnv* env, jobject o, jobject loader, jstring name))
 120   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 121   const char* class_name = env->GetStringUTFChars(name, NULL);
 122   jboolean result = JVM_KnownToNotExist(env, loader, class_name);
 123   env->ReleaseStringUTFChars(name, class_name);
 124   return result;
 125 WB_END
 126 
 127 WB_ENTRY(jobjectArray, WB_GetLookupCacheURLs(JNIEnv* env, jobject o, jobject loader))
 128   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 129   return JVM_GetResourceLookupCacheURLs(env, loader);
 130 WB_END
 131 
 132 WB_ENTRY(jintArray, WB_GetLookupCacheMatches(JNIEnv* env, jobject o, jobject loader, jstring name))
 133   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 134   const char* resource_name = env->GetStringUTFChars(name, NULL);
 135   jintArray result = JVM_GetResourceLookupCache(env, loader, resource_name);
 136 
 137   env->ReleaseStringUTFChars(name, resource_name);
 138   return result;
 139 WB_END
 140 
 141 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 142 #if INCLUDE_JVMTI
 143   ResourceMark rm;
 144   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 145   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 146   jvmtiError err = jvmti_env->AddToBootstrapClassLoaderSearch(seg);
 147   assert(err == JVMTI_ERROR_NONE, "must not fail");
 148 #endif
 149 }
 150 WB_END
 151 
 152 WB_ENTRY(void, WB_AddToSystemClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {
 153 #if INCLUDE_JVMTI
 154   ResourceMark rm;
 155   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));
 156   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);
 157   jvmtiError err = jvmti_env->AddToSystemClassLoaderSearch(seg);
 158   assert(err == JVMTI_ERROR_NONE, "must not fail");
 159 #endif
 160 }
 161 WB_END
 162 
 163 #ifdef LINUX
 164 #include "utilities/elfFile.hpp"
 165 #include "osContainer_linux.hpp"
 166 #endif
 167 
 168 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
 169   return (jlong)Arguments::max_heap_for_compressed_oops();
 170 }
 171 WB_END
 172 
 173 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
 174   CollectorPolicy * p = Universe::heap()->collector_policy();
 175   gclog_or_tty->print_cr("Minimum heap " SIZE_FORMAT " Initial heap "
 176     SIZE_FORMAT " Maximum heap " SIZE_FORMAT " Space alignment " SIZE_FORMAT " Heap alignment " SIZE_FORMAT,
 177     p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),
 178     p->space_alignment(), p->heap_alignment());
 179 }
 180 WB_END
 181 
 182 #ifndef PRODUCT
 183 // Forward declaration
 184 void TestReservedSpace_test();
 185 void TestReserveMemorySpecial_test();
 186 void TestVirtualSpace_test();
 187 void TestMetaspaceAux_test();
 188 #endif
 189 
 190 WB_ENTRY(void, WB_RunMemoryUnitTests(JNIEnv* env, jobject o))
 191 #ifndef PRODUCT
 192   TestReservedSpace_test();
 193   TestReserveMemorySpecial_test();
 194   TestVirtualSpace_test();
 195   TestMetaspaceAux_test();
 196 #endif
 197 WB_END
 198 
 199 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))
 200   size_t granularity = os::vm_allocation_granularity();
 201   ReservedHeapSpace rhs(100 * granularity, granularity, false, NULL);
 202   VirtualSpace vs;
 203   vs.initialize(rhs, 50 * granularity);
 204 
 205   //Check if constraints are complied
 206   if (!( UseCompressedOops && rhs.base() != NULL &&
 207          Universe::narrow_oop_base() != NULL &&
 208          Universe::narrow_oop_use_implicit_null_checks() )) {
 209     tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "
 210                   "\tUseCompressedOops is %d\n"
 211                   "\trhs.base() is " PTR_FORMAT "\n"
 212                   "\tUniverse::narrow_oop_base() is " PTR_FORMAT "\n"
 213                   "\tUniverse::narrow_oop_use_implicit_null_checks() is %d",
 214                   UseCompressedOops,
 215                   rhs.base(),
 216                   Universe::narrow_oop_base(),
 217                   Universe::narrow_oop_use_implicit_null_checks());
 218     return;
 219   }
 220   tty->print_cr("Reading from no access area... ");
 221   tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",
 222                 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));
 223 WB_END
 224 
 225 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,
 226                                            size_t magnitude, size_t iterations) {
 227   size_t granularity = os::vm_allocation_granularity();
 228   ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, false, NULL);
 229   VirtualSpace vs;
 230   if (!vs.initialize(rhs, 0)) {
 231     tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");
 232     return 3;
 233   }
 234 
 235   long seed = os::random();
 236   tty->print_cr("Random seed is %ld", seed);
 237   os::init_random(seed);
 238 
 239   for (size_t i = 0; i < iterations; i++) {
 240 
 241     // Whether we will shrink or grow
 242     bool shrink = os::random() % 2L == 0;
 243 
 244     // Get random delta to resize virtual space
 245     size_t delta = (size_t)os::random() % magnitude;
 246 
 247     // If we are about to shrink virtual space below zero, then expand instead
 248     if (shrink && vs.committed_size() < delta) {
 249       shrink = false;
 250     }
 251 
 252     // Resizing by delta
 253     if (shrink) {
 254       vs.shrink_by(delta);
 255     } else {
 256       // If expanding fails expand_by will silently return false
 257       vs.expand_by(delta, true);
 258     }
 259   }
 260   return 0;
 261 }
 262 
 263 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,
 264         jlong reserved_space_size, jlong magnitude, jlong iterations))
 265   tty->print_cr("reservedSpaceSize=" JLONG_FORMAT ", magnitude=" JLONG_FORMAT ", "
 266                 "iterations=" JLONG_FORMAT "\n", reserved_space_size, magnitude,
 267                 iterations);
 268   if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {
 269     tty->print_cr("One of variables printed above is negative. Can't proceed.\n");
 270     return 1;
 271   }
 272 
 273   // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is
 274   // always 8 byte. That's why we should avoid overflow in case of 32bit platform.
 275   if (sizeof(size_t) < sizeof(jlong)) {
 276     jlong size_t_max_value = (jlong) SIZE_T_MAX_VALUE;
 277     if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value
 278         || iterations > size_t_max_value) {
 279       tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");
 280       return 2;
 281     }
 282   }
 283 
 284   return wb_stress_virtual_space_resize((size_t) reserved_space_size,
 285                                         (size_t) magnitude, (size_t) iterations);
 286 WB_END
 287 
 288 WB_ENTRY(jboolean, WB_isObjectInOldGen(JNIEnv* env, jobject o, jobject obj))
 289   oop p = JNIHandles::resolve(obj);
 290 #if INCLUDE_ALL_GCS
 291   if (UseG1GC) {
 292     G1CollectedHeap* g1 = G1CollectedHeap::heap();
 293     const HeapRegion* hr = g1->heap_region_containing(p);
 294     if (hr == NULL) {
 295       return false;
 296     }
 297     return !(hr->is_young());
 298   } else if (UseParallelGC) {
 299     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
 300     return !psh->is_in_young(p);
 301   }
 302 #endif // INCLUDE_ALL_GCS
 303   GenCollectedHeap* gch = GenCollectedHeap::heap();
 304   return !gch->is_in_young(p);
 305 WB_END
 306 
 307 WB_ENTRY(jlong, WB_GetObjectSize(JNIEnv* env, jobject o, jobject obj))
 308   oop p = JNIHandles::resolve(obj);
 309   return p->size() * HeapWordSize;
 310 WB_END
 311 
 312 #if INCLUDE_ALL_GCS
 313 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
 314   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 315   oop result = JNIHandles::resolve(obj);
 316   const HeapRegion* hr = g1->heap_region_containing(result);
 317   return hr->isHumongous();
 318 WB_END
 319 
 320 WB_ENTRY(jlong, WB_G1NumMaxRegions(JNIEnv* env, jobject o))
 321   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 322   size_t nr = g1->max_regions();
 323   return (jlong)nr;
 324 WB_END
 325 
 326 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
 327   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 328   size_t nr = g1->num_free_regions();
 329   return (jlong)nr;
 330 WB_END
 331 
 332 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
 333   G1CollectedHeap* g1 = G1CollectedHeap::heap();
 334   return g1->concurrent_mark()->cmThread()->during_cycle();
 335 WB_END
 336 
 337 WB_ENTRY(jboolean, WB_G1StartMarkCycle(JNIEnv* env, jobject o))
 338   G1CollectedHeap* g1h = G1CollectedHeap::heap();
 339   if (!g1h->concurrent_mark()->cmThread()->during_cycle()) {
 340     g1h->collect(GCCause::_wb_conc_mark);
 341     return true;
 342   }
 343   return false;
 344 WB_END
 345 
 346 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
 347   return (jint)HeapRegion::GrainBytes;
 348 WB_END
 349 
 350 WB_ENTRY(jobject, WB_G1AuxiliaryMemoryUsage(JNIEnv* env))
 351   ResourceMark rm(THREAD);
 352   G1CollectedHeap* g1h = G1CollectedHeap::heap();
 353   MemoryUsage usage = g1h->get_auxiliary_data_memory_usage();
 354   Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);
 355   return JNIHandles::make_local(env, h());
 356 WB_END
 357 #endif // INCLUDE_ALL_GCS
 358 
 359 #if INCLUDE_NMT
 360 // Alloc memory using the test memory type so that we can use that to see if
 361 // NMT picks it up correctly
 362 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
 363   jlong addr = 0;
 364   addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
 365   return addr;
 366 WB_END
 367 
 368 // Alloc memory with pseudo call stack. The test can create psudo malloc
 369 // allocation site to stress the malloc tracking.
 370 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))
 371   address pc = (address)(size_t)pseudo_stack;
 372   NativeCallStack stack(&pc, 1);
 373   return (jlong)(uintptr_t)os::malloc(size, mtTest, stack);
 374 WB_END
 375 
 376 // Alloc memory with pseudo call stack and specific memory type.
 377 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStackAndType(JNIEnv* env, jobject o, jlong size, jint pseudo_stack, jint type))
 378   address pc = (address)(size_t)pseudo_stack;
 379   NativeCallStack stack(&pc, 1);
 380   return (jlong)(uintptr_t)os::malloc(size, (MEMFLAGS)type, stack);
 381 WB_END
 382 
 383 // Free the memory allocated by NMTAllocTest
 384 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
 385   os::free((void*)(uintptr_t)mem, mtTest);
 386 WB_END
 387 
 388 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
 389   jlong addr = 0;
 390 
 391     addr = (jlong)(uintptr_t)os::reserve_memory(size);
 392     MemTracker::record_virtual_memory_type((address)addr, mtTest);
 393 
 394   return addr;
 395 WB_END
 396 
 397 
 398 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 399   os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
 400   MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
 401 WB_END
 402 
 403 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 404   os::uncommit_memory((char *)(uintptr_t)addr, size);
 405 WB_END
 406 
 407 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
 408   os::release_memory((char *)(uintptr_t)addr, size);
 409 WB_END
 410 
 411 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))
 412   return MemTracker::tracking_level() == NMT_detail;
 413 WB_END
 414 
 415 WB_ENTRY(jboolean, WB_NMTChangeTrackingLevel(JNIEnv* env))
 416   // Test that we can downgrade NMT levels but not upgrade them.
 417   if (MemTracker::tracking_level() == NMT_off) {
 418     MemTracker::transition_to(NMT_off);
 419     return MemTracker::tracking_level() == NMT_off;
 420   } else {
 421     assert(MemTracker::tracking_level() == NMT_detail, "Should start out as detail tracking");
 422     MemTracker::transition_to(NMT_summary);
 423     assert(MemTracker::tracking_level() == NMT_summary, "Should be summary now");
 424 
 425     // Can't go to detail once NMT is set to summary.
 426     MemTracker::transition_to(NMT_detail);
 427     assert(MemTracker::tracking_level() == NMT_summary, "Should still be summary now");
 428 
 429     // Shutdown sets tracking level to minimal.
 430     MemTracker::shutdown();
 431     assert(MemTracker::tracking_level() == NMT_minimal, "Should be minimal now");
 432 
 433     // Once the tracking level is minimal, we cannot increase to summary.
 434     // The code ignores this request instead of asserting because if the malloc site
 435     // table overflows in another thread, it tries to change the code to summary.
 436     MemTracker::transition_to(NMT_summary);
 437     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
 438 
 439     // Really can never go up to detail, verify that the code would never do this.
 440     MemTracker::transition_to(NMT_detail);
 441     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");
 442     return MemTracker::tracking_level() == NMT_minimal;
 443   }
 444 WB_END
 445 
 446 WB_ENTRY(jint, WB_NMTGetHashSize(JNIEnv* env, jobject o))
 447   int hash_size = MallocSiteTable::hash_buckets();
 448   assert(hash_size > 0, "NMT hash_size should be > 0");
 449   return (jint)hash_size;
 450 WB_END
 451 #endif // INCLUDE_NMT
 452 
 453 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
 454   assert(method != NULL, "method should not be null");
 455   ThreadToNativeFromVM ttn(thread);
 456   return env->FromReflectedMethod(method);
 457 }
 458 
 459 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
 460   MutexLockerEx mu(Compile_lock);
 461   CodeCache::mark_all_nmethods_for_deoptimization();
 462   VM_Deoptimize op;
 463   VMThread::execute(&op);
 464 WB_END
 465 
 466 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 467   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 468   int result = 0;
 469   CHECK_JNI_EXCEPTION_(env, result);
 470   MutexLockerEx mu(Compile_lock);
 471   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 472   if (is_osr) {
 473     result += mh->mark_osr_nmethods();
 474   } else if (mh->code() != NULL) {
 475     mh->code()->mark_for_deoptimization();
 476     ++result;
 477   }
 478   result += CodeCache::mark_for_deoptimization(mh());
 479   if (result > 0) {
 480     VM_Deoptimize op;
 481     VMThread::execute(&op);
 482   }
 483   return result;
 484 WB_END
 485 
 486 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 487   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 488   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 489   MutexLockerEx mu(Compile_lock);
 490   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 491   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 492   if (code == NULL) {
 493     return JNI_FALSE;
 494   }
 495   return (code->is_alive() && !code->is_marked_for_deoptimization());
 496 WB_END
 497 
 498 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 499   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 500   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 501   MutexLockerEx mu(Compile_lock);
 502   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 503   if (is_osr) {
 504     return CompilationPolicy::can_be_osr_compiled(mh, comp_level);
 505   } else {
 506     return CompilationPolicy::can_be_compiled(mh, comp_level);
 507   }
 508 WB_END
 509 
 510 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
 511   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 512   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 513   MutexLockerEx mu(Compile_lock);
 514   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 515   return mh->queued_for_compilation();
 516 WB_END
 517 
 518 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 519   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 520   CHECK_JNI_EXCEPTION_(env, CompLevel_none);
 521   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 522   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 523   return (code != NULL ? code->comp_level() : CompLevel_none);
 524 WB_END
 525 
 526 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
 527   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 528   CHECK_JNI_EXCEPTION(env);
 529   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 530   if (is_osr) {
 531     mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
 532   } else {
 533     mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");
 534   }
 535 WB_END
 536 
 537 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
 538   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 539   CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
 540   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 541   nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
 542   return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
 543 WB_END
 544 
 545 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
 546   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 547   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 548   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 549   bool result = mh->dont_inline();
 550   mh->set_dont_inline(value == JNI_TRUE);
 551   return result;
 552 WB_END
 553 
 554 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
 555   if (comp_level == CompLevel_any) {
 556     return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
 557         CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
 558   } else {
 559     return CompileBroker::queue_size(comp_level);
 560   }
 561 WB_END
 562 
 563 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
 564   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 565   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 566   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 567   bool result = mh->force_inline();
 568   mh->set_force_inline(value == JNI_TRUE);
 569   return result;
 570 WB_END
 571 
 572 bool WhiteBox::compile_method(Method* method, int comp_level, int bci, Thread* THREAD) {
 573   // Screen for unavailable/bad comp level or null method
 574   AbstractCompiler* comp = CompileBroker::compiler(comp_level);
 575   if (method == NULL) {
 576     tty->print_cr("WB error: request to compile NULL method");
 577     return false;
 578   }
 579   if (comp_level > MIN2((CompLevel) TieredStopAtLevel, CompLevel_highest_tier)) {
 580     tty->print_cr("WB error: invalid compilation level %d", comp_level);
 581     return false;
 582   }
 583   if (comp == NULL) {
 584     tty->print_cr("WB error: no compiler for requested compilation level %d", comp_level);
 585     return false;
 586   }
 587 
 588   methodHandle mh(THREAD, method);
 589 
 590   // Compile method and check result
 591   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "Whitebox", THREAD);
 592   MutexLocker mu(Compile_lock);
 593   bool is_queued = mh->queued_for_compilation();
 594   if (is_queued || nm != NULL) {
 595     return true;
 596   }
 597   tty->print("WB error: failed to compile at level %d method ", comp_level);
 598   mh->print_short_name(tty);
 599   tty->cr();
 600   if (is_queued) {
 601     tty->print_cr("WB error: blocking compilation is still in queue!");
 602   }
 603   return false;
 604 }
 605 
 606 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
 607   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 608   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
 609   return WhiteBox::compile_method(Method::checked_resolve_jmethod_id(jmid), comp_level, bci, THREAD);
 610 WB_END
 611 
 612 WB_ENTRY(jboolean, WB_EnqueueInitializerForCompilation(JNIEnv* env, jobject o, jclass klass, jint comp_level))
 613   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));
 614   Method* clinit = ik->class_initializer();
 615   if (clinit == NULL) {
 616     return false;
 617   }
 618   return WhiteBox::compile_method(clinit, comp_level, InvocationEntryBci, THREAD);
 619 WB_END
 620 
 621 class VM_WhiteBoxOperation : public VM_Operation {
 622  public:
 623   VM_WhiteBoxOperation()                         { }
 624   VMOp_Type type()                  const        { return VMOp_WhiteBoxOperation; }
 625   bool allow_nested_vm_operations() const        { return true; }
 626 };
 627 
 628 static AlwaysFalseClosure always_false;
 629 
 630 class VM_WhiteBoxCleanMethodData : public VM_WhiteBoxOperation {
 631  public:
 632   VM_WhiteBoxCleanMethodData(MethodData* mdo) : _mdo(mdo) { }
 633   void doit() {
 634     _mdo->clean_method_data(&always_false);
 635   }
 636  private:
 637   MethodData* _mdo;
 638 };
 639 
 640 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
 641   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 642   CHECK_JNI_EXCEPTION(env);
 643   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 644   MutexLockerEx mu(Compile_lock);
 645   MethodData* mdo = mh->method_data();
 646   MethodCounters* mcs = mh->method_counters();
 647 
 648   if (mdo != NULL) {
 649     mdo->init();
 650     ResourceMark rm;
 651     int arg_count = mdo->method()->size_of_parameters();
 652     for (int i = 0; i < arg_count; i++) {
 653       mdo->set_arg_modified(i, 0);
 654     }
 655     VM_WhiteBoxCleanMethodData op(mdo);
 656     VMThread::execute(&op);
 657   }
 658 
 659   mh->clear_not_c1_compilable();
 660   mh->clear_not_c2_compilable();
 661   mh->clear_not_c2_osr_compilable();
 662   NOT_PRODUCT(mh->set_compiled_invocation_count(0));
 663   if (mcs != NULL) {
 664     mcs->backedge_counter()->init();
 665     mcs->invocation_counter()->init();
 666     mcs->set_interpreter_invocation_count(0);
 667     mcs->set_interpreter_throwout_count(0);
 668 
 669 #ifdef TIERED
 670     mcs->set_rate(0.0F);
 671     mh->set_prev_event_count(0);
 672     mh->set_prev_time(0);
 673 #endif
 674   }
 675 WB_END
 676 
 677 WB_ENTRY(void, WB_MarkMethodProfiled(JNIEnv* env, jobject o, jobject method))
 678   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 679   CHECK_JNI_EXCEPTION(env);
 680   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 681 
 682   MethodData* mdo = mh->method_data();
 683   if (mdo == NULL) {
 684     Method::build_interpreter_method_data(mh, CHECK_AND_CLEAR);
 685     mdo = mh->method_data();
 686   }
 687   mdo->init();
 688   InvocationCounter* icnt = mdo->invocation_counter();
 689   InvocationCounter* bcnt = mdo->backedge_counter();
 690   // set i-counter according to AdvancedThresholdPolicy::is_method_profiled
 691   // because SimpleThresholdPolicy::call_predicate_helper uses > in jdk8u, that's why we need to plus one.
 692   icnt->set(InvocationCounter::wait_for_compile, Tier4MinInvocationThreshold + 1);
 693   bcnt->set(InvocationCounter::wait_for_compile, Tier4CompileThreshold + 1);
 694 WB_END
 695 
 696 template <typename T>
 697 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAt)(const char*, T*, bool, bool)) {
 698   if (name == NULL) {
 699     return false;
 700   }
 701   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 702   const char* flag_name = env->GetStringUTFChars(name, NULL);
 703   bool result = (*TAt)(flag_name, value, true, true);
 704   env->ReleaseStringUTFChars(name, flag_name);
 705   return result;
 706 }
 707 
 708 template <typename T>
 709 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAtPut)(const char*, T*, Flag::Flags)) {
 710   if (name == NULL) {
 711     return false;
 712   }
 713   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 714   const char* flag_name = env->GetStringUTFChars(name, NULL);
 715   bool result = (*TAtPut)(flag_name, value, Flag::INTERNAL);
 716   env->ReleaseStringUTFChars(name, flag_name);
 717   return result;
 718 }
 719 
 720 template <typename T>
 721 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {
 722   ResourceMark rm(thread);
 723   jclass clazz = env->FindClass(name->as_C_string());
 724   CHECK_JNI_EXCEPTION_(env, NULL);
 725   jmethodID methodID = env->GetStaticMethodID(clazz,
 726         vmSymbols::valueOf_name()->as_C_string(),
 727         sig->as_C_string());
 728   CHECK_JNI_EXCEPTION_(env, NULL);
 729   jobject result = env->CallStaticObjectMethod(clazz, methodID, value);
 730   CHECK_JNI_EXCEPTION_(env, NULL);
 731   return result;
 732 }
 733 
 734 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {
 735   return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);
 736 }
 737 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {
 738   return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);
 739 }
 740 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {
 741   return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);
 742 }
 743 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {
 744   return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);
 745 }*/
 746 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {
 747   return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);
 748 }
 749 
 750 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))
 751   bool result;
 752   if (GetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAt)) {
 753     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 754     return booleanBox(thread, env, result);
 755   }
 756   return NULL;
 757 WB_END
 758 
 759 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))
 760   intx result;
 761   if (GetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAt)) {
 762     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 763     return longBox(thread, env, result);
 764   }
 765   return NULL;
 766 WB_END
 767 
 768 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))
 769   uintx result;
 770   if (GetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAt)) {
 771     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 772     return longBox(thread, env, result);
 773   }
 774   return NULL;
 775 WB_END
 776 
 777 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))
 778   uint64_t result;
 779   if (GetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAt)) {
 780     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 781     return longBox(thread, env, result);
 782   }
 783   return NULL;
 784 WB_END
 785 
 786 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))
 787   double result;
 788   if (GetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAt)) {
 789     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 790     return doubleBox(thread, env, result);
 791   }
 792   return NULL;
 793 WB_END
 794 
 795 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))
 796   ccstr ccstrResult;
 797   if (GetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAt)) {
 798     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 799     jstring result = env->NewStringUTF(ccstrResult);
 800     CHECK_JNI_EXCEPTION_(env, NULL);
 801     return result;
 802   }
 803   return NULL;
 804 WB_END
 805 
 806 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))
 807   bool result = value == JNI_TRUE ? true : false;
 808   SetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAtPut);
 809 WB_END
 810 
 811 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 812   intx result = value;
 813   SetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAtPut);
 814 WB_END
 815 
 816 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 817   uintx result = value;
 818   SetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAtPut);
 819 WB_END
 820 
 821 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
 822   uint64_t result = value;
 823   SetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAtPut);
 824 WB_END
 825 
 826 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))
 827   double result = value;
 828   SetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAtPut);
 829 WB_END
 830 
 831 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))
 832   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
 833   const char* ccstrValue = (value == NULL) ? NULL : env->GetStringUTFChars(value, NULL);
 834   ccstr ccstrResult = ccstrValue;
 835   bool needFree;
 836   {
 837     ThreadInVMfromNative ttvfn(thread); // back to VM
 838     needFree = SetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAtPut);
 839   }
 840   if (value != NULL) {
 841     env->ReleaseStringUTFChars(value, ccstrValue);
 842   }
 843   if (needFree) {
 844     FREE_C_HEAP_ARRAY(char, ccstrResult, mtInternal);
 845   }
 846 WB_END
 847 
 848 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
 849   ResourceMark rm(THREAD);
 850   int len;
 851   jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
 852   return (StringTable::lookup(name, len) != NULL);
 853 WB_END
 854 
 855 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
 856   Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);
 857   Universe::heap()->collect(GCCause::_last_ditch_collection);
 858 #if INCLUDE_ALL_GCS
 859   if (UseG1GC) {
 860     // Needs to be cleared explicitly for G1
 861     Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(false);
 862   }
 863 #endif // INCLUDE_ALL_GCS
 864 WB_END
 865 
 866 WB_ENTRY(void, WB_YoungGC(JNIEnv* env, jobject o))
 867   Universe::heap()->collect(GCCause::_wb_young_gc);
 868 WB_END
 869 
 870 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
 871   // static+volatile in order to force the read to happen
 872   // (not be eliminated by the compiler)
 873   static char c;
 874   static volatile char* p;
 875 
 876   p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);
 877   if (p == NULL) {
 878     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
 879   }
 880 
 881   c = *p;
 882 WB_END
 883 
 884 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
 885   const char* cpu_features = VM_Version::cpu_features();
 886   ThreadToNativeFromVM ttn(thread);
 887   jstring features_string = env->NewStringUTF(cpu_features);
 888 
 889   CHECK_JNI_EXCEPTION_(env, NULL);
 890 
 891   return features_string;
 892 WB_END
 893 
 894 int WhiteBox::get_blob_type(const CodeBlob* code) {
 895   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 896   return CodeBlobType::All;;
 897 }
 898 
 899 struct CodeBlobStub {
 900   CodeBlobStub(const CodeBlob* blob) :
 901       name(os::strdup(blob->name())),
 902       size(blob->size()),
 903       blob_type(WhiteBox::get_blob_type(blob)),
 904       address((jlong) blob) { }
 905   ~CodeBlobStub() { os::free((void*) name); }
 906   const char* const name;
 907   const jint        size;
 908   const jint        blob_type;
 909   const jlong       address;
 910 };
 911 
 912 static jobjectArray codeBlob2objectArray(JavaThread* thread, JNIEnv* env, CodeBlobStub* cb) {
 913   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
 914   CHECK_JNI_EXCEPTION_(env, NULL);
 915   jobjectArray result = env->NewObjectArray(4, clazz, NULL);
 916 
 917   jstring name = env->NewStringUTF(cb->name);
 918   CHECK_JNI_EXCEPTION_(env, NULL);
 919   env->SetObjectArrayElement(result, 0, name);
 920 
 921   jobject obj = integerBox(thread, env, cb->size);
 922   CHECK_JNI_EXCEPTION_(env, NULL);
 923   env->SetObjectArrayElement(result, 1, obj);
 924 
 925   obj = integerBox(thread, env, cb->blob_type);
 926   CHECK_JNI_EXCEPTION_(env, NULL);
 927   env->SetObjectArrayElement(result, 2, obj);
 928 
 929   obj = longBox(thread, env, cb->address);
 930   CHECK_JNI_EXCEPTION_(env, NULL);
 931   env->SetObjectArrayElement(result, 3, obj);
 932 
 933   return result;
 934 }
 935 
 936 WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
 937   ResourceMark rm(THREAD);
 938   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
 939   CHECK_JNI_EXCEPTION_(env, NULL);
 940   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
 941   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
 942   jobjectArray result = NULL;
 943   if (code == NULL) {
 944     return result;
 945   }
 946   int insts_size = code->insts_size();
 947 
 948   ThreadToNativeFromVM ttn(thread);
 949   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
 950   CHECK_JNI_EXCEPTION_(env, NULL);
 951   result = env->NewObjectArray(3, clazz, NULL);
 952   if (result == NULL) {
 953     return result;
 954   }
 955 
 956   jobject level = integerBox(thread, env, code->comp_level());
 957   CHECK_JNI_EXCEPTION_(env, NULL);
 958   env->SetObjectArrayElement(result, 0, level);
 959 
 960   jobject id = integerBox(thread, env, code->compile_id());
 961   CHECK_JNI_EXCEPTION_(env, NULL);
 962   env->SetObjectArrayElement(result, 1, id);
 963 
 964   jbyteArray insts = env->NewByteArray(insts_size);
 965   CHECK_JNI_EXCEPTION_(env, NULL);
 966   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
 967   env->SetObjectArrayElement(result, 2, insts);
 968 
 969   return result;
 970 WB_END
 971 
 972 CodeBlob* WhiteBox::allocate_code_blob(int size, int blob_type) {
 973   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");
 974   BufferBlob* blob;
 975   int full_size = CodeBlob::align_code_offset(sizeof(BufferBlob));
 976   if (full_size < size) {
 977     full_size += align_up(size - full_size, oopSize);
 978   }
 979   {
 980     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
 981     blob = (BufferBlob*) CodeCache::allocate(full_size);
 982     ::new (blob) BufferBlob("WB::DummyBlob", full_size);
 983   }
 984   // Track memory usage statistic after releasing CodeCache_lock
 985   MemoryService::track_code_cache_memory_usage();
 986   return blob;
 987 }
 988 
 989 WB_ENTRY(jlong, WB_AllocateCodeBlob(JNIEnv* env, jobject o, jint size, jint blob_type))
 990   if (size < 0) {
 991     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
 992       err_msg("WB_AllocateCodeBlob: size is negative: " INT32_FORMAT, size));
 993   }
 994   return (jlong) WhiteBox::allocate_code_blob(size, blob_type);
 995 WB_END
 996 
 997 WB_ENTRY(void, WB_FreeCodeBlob(JNIEnv* env, jobject o, jlong addr))
 998   if (addr == 0) {
 999     return;
1000   }
1001   BufferBlob::free((BufferBlob*) addr);
1002 WB_END
1003 
1004 WB_ENTRY(jobjectArray, WB_GetCodeBlob(JNIEnv* env, jobject o, jlong addr))
1005   if (addr == 0) {
1006     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),
1007       "WB_GetCodeBlob: addr is null");
1008   }
1009   ThreadToNativeFromVM ttn(thread);
1010   CodeBlobStub stub((CodeBlob*) addr);
1011   return codeBlob2objectArray(thread, env, &stub);
1012 WB_END
1013 
1014 int WhiteBox::array_bytes_to_length(size_t bytes) {
1015   return Array<u1>::bytes_to_length(bytes);
1016 }
1017 
1018 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))
1019   if (size < 0) {
1020     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1021         err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));
1022   }
1023 
1024   oop class_loader_oop = JNIHandles::resolve(class_loader);
1025   ClassLoaderData* cld = class_loader_oop != NULL
1026       ? java_lang_ClassLoader::loader_data(class_loader_oop)
1027       : ClassLoaderData::the_null_class_loader_data();
1028 
1029   void* metadata = MetadataFactory::new_writeable_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
1030 
1031   return (jlong)(uintptr_t)metadata;
1032 WB_END
1033 
1034 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))
1035   oop class_loader_oop = JNIHandles::resolve(class_loader);
1036   ClassLoaderData* cld = class_loader_oop != NULL
1037       ? java_lang_ClassLoader::loader_data(class_loader_oop)
1038       : ClassLoaderData::the_null_class_loader_data();
1039 
1040   MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);
1041 WB_END
1042 
1043 WB_ENTRY(jlong, WB_IncMetaspaceCapacityUntilGC(JNIEnv* env, jobject wb, jlong inc))
1044   if (inc < 0) {
1045     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1046         err_msg("WB_IncMetaspaceCapacityUntilGC: inc is negative: " JLONG_FORMAT, inc));
1047   }
1048 
1049   jlong max_size_t = (jlong) ((size_t) -1);
1050   if (inc > max_size_t) {
1051     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
1052         err_msg("WB_IncMetaspaceCapacityUntilGC: inc does not fit in size_t: " JLONG_FORMAT, inc));
1053   }
1054 
1055   size_t new_cap_until_GC = 0;
1056   size_t aligned_inc = align_size_down((size_t) inc, Metaspace::commit_alignment());
1057   bool success = MetaspaceGC::inc_capacity_until_GC(aligned_inc, &new_cap_until_GC);
1058   if (!success) {
1059     THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(),
1060                 "WB_IncMetaspaceCapacityUntilGC: could not increase capacity until GC "
1061                 "due to contention with another thread");
1062   }
1063   return (jlong) new_cap_until_GC;
1064 WB_END
1065 
1066 WB_ENTRY(jlong, WB_MetaspaceCapacityUntilGC(JNIEnv* env, jobject wb))
1067   return (jlong) MetaspaceGC::capacity_until_GC();
1068 WB_END
1069 
1070 WB_ENTRY(jboolean, WB_IsSharedClass(JNIEnv* env, jobject wb, jclass clazz))
1071   return (jboolean)MetaspaceShared::is_in_shared_space(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));
1072 WB_END
1073 
1074 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))
1075   oop obj_oop = JNIHandles::resolve(obj);
1076   return (jboolean) obj_oop->mark()->has_monitor();
1077 WB_END
1078 
1079 WB_ENTRY(void, WB_ForceSafepoint(JNIEnv* env, jobject wb))
1080   VM_ForceSafepoint force_safepoint_op;
1081   VMThread::execute(&force_safepoint_op);
1082 WB_END
1083 
1084 WB_ENTRY(jlong, WB_GetHeapAlignment(JNIEnv* env, jobject o))
1085     size_t alignment = Universe::heap()->collector_policy()->heap_alignment();
1086     return (jlong)alignment;
1087 WB_END
1088 
1089 //Some convenience methods to deal with objects from java
1090 int WhiteBox::offset_for_field(const char* field_name, oop object,
1091     Symbol* signature_symbol) {
1092   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
1093   Thread* THREAD = Thread::current();
1094 
1095   //Get the class of our object
1096   Klass* arg_klass = object->klass();
1097   //Turn it into an instance-klass
1098   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
1099 
1100   //Create symbols to look for in the class
1101   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
1102       THREAD);
1103 
1104   //To be filled in with an offset of the field we're looking for
1105   fieldDescriptor fd;
1106 
1107   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
1108   if (res == NULL) {
1109     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
1110         name_symbol->as_C_string());
1111     vm_exit_during_initialization("Invalid layout of preloaded class: use -XX:+TraceClassLoading to see the origin of the problem class");
1112   }
1113 
1114   //fetch the field at the offset we've found
1115   int dest_offset = fd.offset();
1116 
1117   return dest_offset;
1118 }
1119 
1120 
1121 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
1122   int offset = offset_for_field(field_name, object,
1123       vmSymbols::string_signature());
1124   oop string = object->obj_field(offset);
1125   if (string == NULL) {
1126     return NULL;
1127   }
1128   const char* ret = java_lang_String::as_utf8_string(string);
1129   return ret;
1130 }
1131 
1132 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
1133   int offset =
1134       offset_for_field(field_name, object, vmSymbols::bool_signature());
1135   bool ret = (object->bool_field(offset) == JNI_TRUE);
1136   return ret;
1137 }
1138 
1139 void WhiteBox::register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread, JNINativeMethod* method_array, int method_count) {
1140   ResourceMark rm;
1141   ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
1142 
1143   //  one by one registration natives for exception catching
1144   jclass no_such_method_error_klass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
1145   CHECK_JNI_EXCEPTION(env);
1146   for (int i = 0, n = method_count; i < n; ++i) {
1147     // Skip dummy entries
1148     if (method_array[i].fnPtr == NULL) continue;
1149     if (env->RegisterNatives(wbclass, &method_array[i], 1) != 0) {
1150       jthrowable throwable_obj = env->ExceptionOccurred();
1151       if (throwable_obj != NULL) {
1152         env->ExceptionClear();
1153         if (env->IsInstanceOf(throwable_obj, no_such_method_error_klass)) {
1154           // NoSuchMethodError is thrown when a method can't be found or a method is not native.
1155           // Ignoring the exception since it is not preventing use of other WhiteBox methods.
1156           tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s",
1157               method_array[i].name, method_array[i].signature);
1158         }
1159       } else {
1160         // Registration failed unexpectedly.
1161         tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered",
1162             method_array[i].name, method_array[i].signature);
1163         env->UnregisterNatives(wbclass);
1164         break;
1165       }
1166     }
1167   }
1168 }
1169 
1170 // Checks that the library libfile has the noexecstack bit set.
1171 WB_ENTRY(jboolean, WB_CheckLibSpecifiesNoexecstack(JNIEnv* env, jobject o, jstring libfile))
1172   jboolean ret = false;
1173 #ifdef LINUX
1174   // Can't be in VM when we call JNI.
1175   ThreadToNativeFromVM ttnfv(thread);
1176   const char* lf = env->GetStringUTFChars(libfile, NULL);
1177   CHECK_JNI_EXCEPTION_(env, 0);
1178   ElfFile ef(lf);
1179   ret = (jboolean) ef.specifies_noexecstack();
1180   env->ReleaseStringUTFChars(libfile, lf);
1181 #endif
1182   return ret;
1183 WB_END
1184 
1185 WB_ENTRY(jboolean, WB_IsContainerized(JNIEnv* env, jobject o))
1186   LINUX_ONLY(return OSContainer::is_containerized();)
1187   return false;
1188 WB_END
1189 
1190 WB_ENTRY(void, WB_PrintOsInfo(JNIEnv* env, jobject o))
1191   os::print_os_info(tty);
1192 WB_END
1193 
1194 #define CC (char*)
1195 
1196 static JNINativeMethod methods[] = {
1197   {CC"getObjectAddress",   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
1198   {CC"getObjectSize",      CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },
1199   {CC"isObjectInOldGen",   CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen  },
1200   {CC"getHeapOopSize",     CC"()I",                   (void*)&WB_GetHeapOopSize    },
1201   {CC"getVMPageSize",      CC"()I",                   (void*)&WB_GetVMPageSize     },
1202   {CC"getVMLargePageSize", CC"()J",                   (void*)&WB_GetVMLargePageSize},
1203   {CC"getHeapAlignment",   CC"()J",                   (void*)&WB_GetHeapAlignment  },
1204   {CC"isClassAlive0",      CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },
1205   {CC"classKnownToNotExist",
1206                            CC"(Ljava/lang/ClassLoader;Ljava/lang/String;)Z",(void*)&WB_ClassKnownToNotExist},
1207   {CC"getLookupCacheURLs", CC"(Ljava/lang/ClassLoader;)[Ljava/net/URL;",    (void*)&WB_GetLookupCacheURLs},
1208   {CC"getLookupCacheMatches", CC"(Ljava/lang/ClassLoader;Ljava/lang/String;)[I",
1209                                                       (void*)&WB_GetLookupCacheMatches},
1210   {CC"parseCommandLine",
1211       CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
1212       (void*) &WB_ParseCommandLine
1213   },
1214   {CC"addToBootstrapClassLoaderSearch", CC"(Ljava/lang/String;)V",
1215                                                       (void*)&WB_AddToBootstrapClassLoaderSearch},
1216   {CC"addToSystemClassLoaderSearch",    CC"(Ljava/lang/String;)V",
1217                                                       (void*)&WB_AddToSystemClassLoaderSearch},
1218   {CC"getCompressedOopsMaxHeapSize", CC"()J",
1219       (void*)&WB_GetCompressedOopsMaxHeapSize},
1220   {CC"printHeapSizes",     CC"()V",                   (void*)&WB_PrintHeapSizes    },
1221   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},
1222   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
1223   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
1224   {CC"isSharedClass", CC"(Ljava/lang/Class;)Z",       (void*)&WB_IsSharedClass },
1225 #if INCLUDE_ALL_GCS
1226   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
1227   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
1228   {CC"g1NumMaxRegions",    CC"()J",                   (void*)&WB_G1NumMaxRegions  },
1229   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },
1230   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },
1231   {CC"g1StartConcMarkCycle",       CC"()Z",           (void*)&WB_G1StartMarkCycle  },
1232   {CC"g1AuxiliaryMemoryUsage", CC"()Ljava/lang/management/MemoryUsage;",
1233                                                       (void*)&WB_G1AuxiliaryMemoryUsage  },
1234 #endif // INCLUDE_ALL_GCS
1235 #if INCLUDE_NMT
1236   {CC"NMTMalloc",           CC"(J)J",                 (void*)&WB_NMTMalloc          },
1237   {CC"NMTMallocWithPseudoStack", CC"(JI)J",           (void*)&WB_NMTMallocWithPseudoStack},
1238   {CC"NMTMallocWithPseudoStackAndType", CC"(JII)J",   (void*)&WB_NMTMallocWithPseudoStackAndType},
1239   {CC"NMTFree",             CC"(J)V",                 (void*)&WB_NMTFree            },
1240   {CC"NMTReserveMemory",    CC"(J)J",                 (void*)&WB_NMTReserveMemory   },
1241   {CC"NMTCommitMemory",     CC"(JJ)V",                (void*)&WB_NMTCommitMemory    },
1242   {CC"NMTUncommitMemory",   CC"(JJ)V",                (void*)&WB_NMTUncommitMemory  },
1243   {CC"NMTReleaseMemory",    CC"(JJ)V",                (void*)&WB_NMTReleaseMemory   },
1244   {CC"NMTIsDetailSupported",CC"()Z",                  (void*)&WB_NMTIsDetailSupported},
1245   {CC"NMTChangeTrackingLevel", CC"()Z",               (void*)&WB_NMTChangeTrackingLevel},
1246   {CC"NMTGetHashSize",      CC"()I",                  (void*)&WB_NMTGetHashSize     },
1247 #endif // INCLUDE_NMT
1248   {CC"deoptimizeAll",      CC"()V",                   (void*)&WB_DeoptimizeAll     },
1249   {CC"deoptimizeMethod",   CC"(Ljava/lang/reflect/Executable;Z)I",
1250                                                       (void*)&WB_DeoptimizeMethod  },
1251   {CC"isMethodCompiled",   CC"(Ljava/lang/reflect/Executable;Z)Z",
1252                                                       (void*)&WB_IsMethodCompiled  },
1253   {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",
1254                                                       (void*)&WB_IsMethodCompilable},
1255   {CC"isMethodQueuedForCompilation",
1256       CC"(Ljava/lang/reflect/Executable;)Z",          (void*)&WB_IsMethodQueuedForCompilation},
1257   {CC"makeMethodNotCompilable",
1258       CC"(Ljava/lang/reflect/Executable;IZ)V",        (void*)&WB_MakeMethodNotCompilable},
1259   {CC"testSetDontInlineMethod",
1260       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetDontInlineMethod},
1261   {CC"getMethodCompilationLevel",
1262       CC"(Ljava/lang/reflect/Executable;Z)I",         (void*)&WB_GetMethodCompilationLevel},
1263   {CC"getMethodEntryBci",
1264       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodEntryBci},
1265   {CC"getCompileQueueSize",
1266       CC"(I)I",                                       (void*)&WB_GetCompileQueueSize},
1267   {CC"testSetForceInlineMethod",
1268       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetForceInlineMethod},
1269   {CC"enqueueMethodForCompilation0",
1270       CC"(Ljava/lang/reflect/Executable;II)Z",        (void*)&WB_EnqueueMethodForCompilation},
1271   {CC"enqueueInitializerForCompilation0",
1272       CC"(Ljava/lang/Class;I)Z",                      (void*)&WB_EnqueueInitializerForCompilation},
1273   {CC"clearMethodState",
1274       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_ClearMethodState},
1275   {CC"markMethodProfiled",
1276       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_MarkMethodProfiled},
1277   {CC"setBooleanVMFlag",   CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},
1278   {CC"setIntxVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},
1279   {CC"setUintxVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},
1280   {CC"setUint64VMFlag",    CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},
1281   {CC"setDoubleVMFlag",    CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},
1282   {CC"setStringVMFlag",    CC"(Ljava/lang/String;Ljava/lang/String;)V",
1283                                                       (void*)&WB_SetStringVMFlag},
1284   {CC"getBooleanVMFlag",   CC"(Ljava/lang/String;)Ljava/lang/Boolean;",
1285                                                       (void*)&WB_GetBooleanVMFlag},
1286   {CC"getIntxVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",
1287                                                       (void*)&WB_GetIntxVMFlag},
1288   {CC"getUintxVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
1289                                                       (void*)&WB_GetUintxVMFlag},
1290   {CC"getUint64VMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Long;",
1291                                                       (void*)&WB_GetUint64VMFlag},
1292   {CC"getDoubleVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Double;",
1293                                                       (void*)&WB_GetDoubleVMFlag},
1294   {CC"getStringVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/String;",
1295                                                       (void*)&WB_GetStringVMFlag},
1296   {CC"isInStringTable",    CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable  },
1297   {CC"fullGC",   CC"()V",                             (void*)&WB_FullGC },
1298   {CC"youngGC",  CC"()V",                             (void*)&WB_YoungGC },
1299   {CC"readReservedMemory", CC"()V",                   (void*)&WB_ReadReservedMemory },
1300   {CC"allocateCodeBlob",   CC"(II)J",                 (void*)&WB_AllocateCodeBlob   },
1301   {CC"freeCodeBlob",       CC"(J)V",                  (void*)&WB_FreeCodeBlob       },
1302   {CC"getCodeBlob",        CC"(J)[Ljava/lang/Object;",(void*)&WB_GetCodeBlob        },
1303   {CC"allocateMetaspace",
1304      CC"(Ljava/lang/ClassLoader;J)J",                 (void*)&WB_AllocateMetaspace },
1305   {CC"freeMetaspace",
1306      CC"(Ljava/lang/ClassLoader;JJ)V",                (void*)&WB_FreeMetaspace },
1307   {CC"incMetaspaceCapacityUntilGC", CC"(J)J",         (void*)&WB_IncMetaspaceCapacityUntilGC },
1308   {CC"metaspaceCapacityUntilGC", CC"()J",             (void*)&WB_MetaspaceCapacityUntilGC },
1309   {CC"getCPUFeatures",     CC"()Ljava/lang/String;",  (void*)&WB_GetCPUFeatures     },
1310   {CC"getNMethod",         CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
1311                                                       (void*)&WB_GetNMethod         },
1312   {CC"isMonitorInflated",  CC"(Ljava/lang/Object;)Z", (void*)&WB_IsMonitorInflated  },
1313   {CC"forceSafepoint",     CC"()V",                   (void*)&WB_ForceSafepoint     },
1314   {CC"checkLibSpecifiesNoexecstack", CC"(Ljava/lang/String;)Z",
1315                                                       (void*)&WB_CheckLibSpecifiesNoexecstack},
1316   {CC"isContainerized",           CC"()Z",            (void*)&WB_IsContainerized },
1317   {CC"printOsInfo",               CC"()V",            (void*)&WB_PrintOsInfo },
1318 };
1319 
1320 #undef CC
1321 
1322 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
1323   {
1324     if (WhiteBoxAPI) {
1325       // Make sure that wbclass is loaded by the null classloader
1326       instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
1327       Handle loader(ikh->class_loader());
1328       if (loader.is_null()) {
1329         WhiteBox::register_methods(env, wbclass, thread, methods, sizeof(methods) / sizeof(methods[0]));
1330         WhiteBox::register_extended(env, wbclass, thread);
1331         WhiteBox::set_used();
1332       }
1333     }
1334   }
1335 JVM_END