src/share/vm/prims/whitebox.cpp

Wed, 27 Aug 2014 08:19:12 -0400

author
zgu
date
Wed, 27 Aug 2014 08:19:12 -0400
changeset 7074
833b0f92429a
parent 7071
4bfc44ba0d19
child 7165
e2452c3ff7fb
permissions
-rw-r--r--

8046598: Scalable Native memory tracking development
Summary: Enhance scalability of native memory tracking
Reviewed-by: coleenp, ctornqvi, gtriantafill

     1 /*
     2  * Copyright (c) 2012, 2014, 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  */
    25 #include "precompiled.hpp"
    27 #include "memory/metadataFactory.hpp"
    28 #include "memory/universe.hpp"
    29 #include "oops/oop.inline.hpp"
    31 #include "classfile/symbolTable.hpp"
    32 #include "classfile/classLoaderData.hpp"
    34 #include "prims/whitebox.hpp"
    35 #include "prims/wbtestmethods/parserTests.hpp"
    37 #include "runtime/arguments.hpp"
    38 #include "runtime/interfaceSupport.hpp"
    39 #include "runtime/os.hpp"
    40 #include "utilities/array.hpp"
    41 #include "utilities/debug.hpp"
    42 #include "utilities/macros.hpp"
    43 #include "utilities/exceptions.hpp"
    45 #if INCLUDE_ALL_GCS
    46 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"
    47 #include "gc_implementation/g1/concurrentMark.hpp"
    48 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
    49 #include "gc_implementation/g1/heapRegionRemSet.hpp"
    50 #endif // INCLUDE_ALL_GCS
    52 #if INCLUDE_NMT
    53 #include "services/mallocSiteTable.hpp"
    54 #include "services/memTracker.hpp"
    55 #include "utilities/nativeCallStack.hpp"
    56 #endif // INCLUDE_NMT
    58 #include "compiler/compileBroker.hpp"
    59 #include "runtime/compilationPolicy.hpp"
    61 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
    63 #define SIZE_T_MAX_VALUE ((size_t) -1)
    65 bool WhiteBox::_used = false;
    67 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
    68   return (jlong)(void*)JNIHandles::resolve(obj);
    69 WB_END
    71 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
    72   return heapOopSize;
    73 WB_END
    76 class WBIsKlassAliveClosure : public KlassClosure {
    77     Symbol* _name;
    78     bool _found;
    79 public:
    80     WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}
    82     void do_klass(Klass* k) {
    83       if (_found) return;
    84       Symbol* ksym = k->name();
    85       if (ksym->fast_compare(_name) == 0) {
    86         _found = true;
    87       }
    88     }
    90     bool found() const {
    91         return _found;
    92     }
    93 };
    95 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))
    96   Handle h_name = JNIHandles::resolve(name);
    97   if (h_name.is_null()) return false;
    98   Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);
    99   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return
   101   WBIsKlassAliveClosure closure(sym);
   102   ClassLoaderDataGraph::classes_do(&closure);
   104   return closure.found();
   105 WB_END
   107 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {
   108   return (jlong)Arguments::max_heap_for_compressed_oops();
   109 }
   110 WB_END
   112 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {
   113   CollectorPolicy * p = Universe::heap()->collector_policy();
   114   gclog_or_tty->print_cr("Minimum heap "SIZE_FORMAT" Initial heap "
   115     SIZE_FORMAT" Maximum heap "SIZE_FORMAT" Min alignment "SIZE_FORMAT" Max alignment "SIZE_FORMAT,
   116     p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),
   117     p->space_alignment(), p->heap_alignment());
   118 }
   119 WB_END
   121 #ifndef PRODUCT
   122 // Forward declaration
   123 void TestReservedSpace_test();
   124 void TestReserveMemorySpecial_test();
   125 void TestVirtualSpace_test();
   126 void TestMetaspaceAux_test();
   127 #endif
   129 WB_ENTRY(void, WB_RunMemoryUnitTests(JNIEnv* env, jobject o))
   130 #ifndef PRODUCT
   131   TestReservedSpace_test();
   132   TestReserveMemorySpecial_test();
   133   TestVirtualSpace_test();
   134   TestMetaspaceAux_test();
   135 #endif
   136 WB_END
   138 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))
   139   size_t granularity = os::vm_allocation_granularity();
   140   ReservedHeapSpace rhs(100 * granularity, granularity, false, NULL);
   141   VirtualSpace vs;
   142   vs.initialize(rhs, 50 * granularity);
   144   //Check if constraints are complied
   145   if (!( UseCompressedOops && rhs.base() != NULL &&
   146          Universe::narrow_oop_base() != NULL &&
   147          Universe::narrow_oop_use_implicit_null_checks() )) {
   148     tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "
   149                   "\tUseCompressedOops is %d\n"
   150                   "\trhs.base() is "PTR_FORMAT"\n"
   151                   "\tUniverse::narrow_oop_base() is "PTR_FORMAT"\n"
   152                   "\tUniverse::narrow_oop_use_implicit_null_checks() is %d",
   153                   UseCompressedOops,
   154                   rhs.base(),
   155                   Universe::narrow_oop_base(),
   156                   Universe::narrow_oop_use_implicit_null_checks());
   157     return;
   158   }
   159   tty->print_cr("Reading from no access area... ");
   160   tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",
   161                 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));
   162 WB_END
   164 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,
   165                                            size_t magnitude, size_t iterations) {
   166   size_t granularity = os::vm_allocation_granularity();
   167   ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, false, NULL);
   168   VirtualSpace vs;
   169   if (!vs.initialize(rhs, 0)) {
   170     tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");
   171     return 3;
   172   }
   174   long seed = os::random();
   175   tty->print_cr("Random seed is %ld", seed);
   176   os::init_random(seed);
   178   for (size_t i = 0; i < iterations; i++) {
   180     // Whether we will shrink or grow
   181     bool shrink = os::random() % 2L == 0;
   183     // Get random delta to resize virtual space
   184     size_t delta = (size_t)os::random() % magnitude;
   186     // If we are about to shrink virtual space below zero, then expand instead
   187     if (shrink && vs.committed_size() < delta) {
   188       shrink = false;
   189     }
   191     // Resizing by delta
   192     if (shrink) {
   193       vs.shrink_by(delta);
   194     } else {
   195       // If expanding fails expand_by will silently return false
   196       vs.expand_by(delta, true);
   197     }
   198   }
   199   return 0;
   200 }
   202 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,
   203         jlong reserved_space_size, jlong magnitude, jlong iterations))
   204   tty->print_cr("reservedSpaceSize="JLONG_FORMAT", magnitude="JLONG_FORMAT", "
   205                 "iterations="JLONG_FORMAT"\n", reserved_space_size, magnitude,
   206                 iterations);
   207   if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {
   208     tty->print_cr("One of variables printed above is negative. Can't proceed.\n");
   209     return 1;
   210   }
   212   // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is
   213   // always 8 byte. That's why we should avoid overflow in case of 32bit platform.
   214   if (sizeof(size_t) < sizeof(jlong)) {
   215     jlong size_t_max_value = (jlong) SIZE_T_MAX_VALUE;
   216     if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value
   217         || iterations > size_t_max_value) {
   218       tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");
   219       return 2;
   220     }
   221   }
   223   return wb_stress_virtual_space_resize((size_t) reserved_space_size,
   224                                         (size_t) magnitude, (size_t) iterations);
   225 WB_END
   227 WB_ENTRY(jboolean, WB_isObjectInOldGen(JNIEnv* env, jobject o, jobject obj))
   228   oop p = JNIHandles::resolve(obj);
   229 #if INCLUDE_ALL_GCS
   230   if (UseG1GC) {
   231     G1CollectedHeap* g1 = G1CollectedHeap::heap();
   232     const HeapRegion* hr = g1->heap_region_containing(p);
   233     if (hr == NULL) {
   234       return false;
   235     }
   236     return !(hr->is_young());
   237   } else if (UseParallelGC) {
   238     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();
   239     return !psh->is_in_young(p);
   240   }
   241 #endif // INCLUDE_ALL_GCS
   242   GenCollectedHeap* gch = GenCollectedHeap::heap();
   243   return !gch->is_in_young(p);
   244 WB_END
   246 WB_ENTRY(jlong, WB_GetObjectSize(JNIEnv* env, jobject o, jobject obj))
   247   oop p = JNIHandles::resolve(obj);
   248   return p->size() * HeapWordSize;
   249 WB_END
   251 #if INCLUDE_ALL_GCS
   252 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
   253   G1CollectedHeap* g1 = G1CollectedHeap::heap();
   254   oop result = JNIHandles::resolve(obj);
   255   const HeapRegion* hr = g1->heap_region_containing(result);
   256   return hr->isHumongous();
   257 WB_END
   259 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
   260   G1CollectedHeap* g1 = G1CollectedHeap::heap();
   261   size_t nr = g1->num_free_regions();
   262   return (jlong)nr;
   263 WB_END
   265 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
   266   G1CollectedHeap* g1 = G1CollectedHeap::heap();
   267   ConcurrentMark* cm = g1->concurrent_mark();
   268   return cm->concurrent_marking_in_progress();
   269 WB_END
   271 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
   272   return (jint)HeapRegion::GrainBytes;
   273 WB_END
   274 #endif // INCLUDE_ALL_GCS
   276 #if INCLUDE_NMT
   277 // Alloc memory using the test memory type so that we can use that to see if
   278 // NMT picks it up correctly
   279 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))
   280   jlong addr = 0;
   281     addr = (jlong)(uintptr_t)os::malloc(size, mtTest);
   282   return addr;
   283 WB_END
   285 // Alloc memory with pseudo call stack. The test can create psudo malloc
   286 // allocation site to stress the malloc tracking.
   287 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))
   288   address pc = (address)(size_t)pseudo_stack;
   289   NativeCallStack stack(&pc, 1);
   290   return (jlong)os::malloc(size, mtTest, stack);
   291 WB_END
   293 // Free the memory allocated by NMTAllocTest
   294 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))
   295   os::free((void*)(uintptr_t)mem, mtTest);
   296 WB_END
   298 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))
   299   jlong addr = 0;
   301     addr = (jlong)(uintptr_t)os::reserve_memory(size);
   302     MemTracker::record_virtual_memory_type((address)addr, mtTest);
   304   return addr;
   305 WB_END
   308 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
   309   os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);
   310   MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);
   311 WB_END
   313 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
   314   os::uncommit_memory((char *)(uintptr_t)addr, size);
   315 WB_END
   317 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))
   318   os::release_memory((char *)(uintptr_t)addr, size);
   319 WB_END
   321 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))
   322   return MemTracker::tracking_level() == NMT_detail;
   323 WB_END
   325 WB_ENTRY(void, WB_NMTOverflowHashBucket(JNIEnv* env, jobject o, jlong num))
   326   address pc = (address)1;
   327   for (jlong index = 0; index < num; index ++) {
   328     NativeCallStack stack(&pc, 1);
   329     os::malloc(0, mtTest, stack);
   330     pc += MallocSiteTable::hash_buckets();
   331   }
   332 WB_END
   335 #endif // INCLUDE_NMT
   337 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {
   338   assert(method != NULL, "method should not be null");
   339   ThreadToNativeFromVM ttn(thread);
   340   return env->FromReflectedMethod(method);
   341 }
   343 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))
   344   MutexLockerEx mu(Compile_lock);
   345   CodeCache::mark_all_nmethods_for_deoptimization();
   346   VM_Deoptimize op;
   347   VMThread::execute(&op);
   348 WB_END
   350 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   351   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   352   int result = 0;
   353   CHECK_JNI_EXCEPTION_(env, result);
   354   MutexLockerEx mu(Compile_lock);
   355   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   356   nmethod* code;
   357   if (is_osr) {
   358     int bci = InvocationEntryBci;
   359     while ((code = mh->lookup_osr_nmethod_for(bci, CompLevel_none, false)) != NULL) {
   360       code->mark_for_deoptimization();
   361       ++result;
   362       bci = code->osr_entry_bci() + 1;
   363     }
   364   } else {
   365     code = mh->code();
   366   }
   367   if (code != NULL) {
   368     code->mark_for_deoptimization();
   369     ++result;
   370   }
   371   result += CodeCache::mark_for_deoptimization(mh());
   372   if (result > 0) {
   373     VM_Deoptimize op;
   374     VMThread::execute(&op);
   375   }
   376   return result;
   377 WB_END
   379 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   380   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   381   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   382   MutexLockerEx mu(Compile_lock);
   383   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   384   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
   385   if (code == NULL) {
   386     return JNI_FALSE;
   387   }
   388   return (code->is_alive() && !code->is_marked_for_deoptimization());
   389 WB_END
   391 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
   392   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   393   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   394   MutexLockerEx mu(Compile_lock);
   395   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   396   if (is_osr) {
   397     return CompilationPolicy::can_be_osr_compiled(mh, comp_level);
   398   } else {
   399     return CompilationPolicy::can_be_compiled(mh, comp_level);
   400   }
   401 WB_END
   403 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
   404   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   405   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   406   MutexLockerEx mu(Compile_lock);
   407   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   408   return mh->queued_for_compilation();
   409 WB_END
   411 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   412   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   413   CHECK_JNI_EXCEPTION_(env, CompLevel_none);
   414   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   415   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
   416   return (code != NULL ? code->comp_level() : CompLevel_none);
   417 WB_END
   419 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
   420   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   421   CHECK_JNI_EXCEPTION(env);
   422   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   423   if (is_osr) {
   424     mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
   425   } else {
   426     mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");
   427   }
   428 WB_END
   430 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
   431   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   432   CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
   433   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   434   nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
   435   return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
   436 WB_END
   438 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
   439   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   440   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   441   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   442   bool result = mh->dont_inline();
   443   mh->set_dont_inline(value == JNI_TRUE);
   444   return result;
   445 WB_END
   447 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))
   448   if (comp_level == CompLevel_any) {
   449     return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +
   450         CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;
   451   } else {
   452     return CompileBroker::queue_size(comp_level);
   453   }
   454 WB_END
   456 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
   457   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   458   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   459   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   460   bool result = mh->force_inline();
   461   mh->set_force_inline(value == JNI_TRUE);
   462   return result;
   463 WB_END
   465 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
   466   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   467   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   468   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   469   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);
   470   MutexLockerEx mu(Compile_lock);
   471   return (mh->queued_for_compilation() || nm != NULL);
   472 WB_END
   474 class VM_WhiteBoxOperation : public VM_Operation {
   475  public:
   476   VM_WhiteBoxOperation()                         { }
   477   VMOp_Type type()                  const        { return VMOp_WhiteBoxOperation; }
   478   bool allow_nested_vm_operations() const        { return true; }
   479 };
   481 class AlwaysFalseClosure : public BoolObjectClosure {
   482  public:
   483   bool do_object_b(oop p) { return false; }
   484 };
   486 static AlwaysFalseClosure always_false;
   488 class VM_WhiteBoxCleanMethodData : public VM_WhiteBoxOperation {
   489  public:
   490   VM_WhiteBoxCleanMethodData(MethodData* mdo) : _mdo(mdo) { }
   491   void doit() {
   492     _mdo->clean_method_data(&always_false);
   493   }
   494  private:
   495   MethodData* _mdo;
   496 };
   498 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
   499   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   500   CHECK_JNI_EXCEPTION(env);
   501   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   502   MutexLockerEx mu(Compile_lock);
   503   MethodData* mdo = mh->method_data();
   504   MethodCounters* mcs = mh->method_counters();
   506   if (mdo != NULL) {
   507     mdo->init();
   508     ResourceMark rm;
   509     int arg_count = mdo->method()->size_of_parameters();
   510     for (int i = 0; i < arg_count; i++) {
   511       mdo->set_arg_modified(i, 0);
   512     }
   513     VM_WhiteBoxCleanMethodData op(mdo);
   514     VMThread::execute(&op);
   515   }
   517   mh->clear_not_c1_compilable();
   518   mh->clear_not_c2_compilable();
   519   mh->clear_not_c2_osr_compilable();
   520   NOT_PRODUCT(mh->set_compiled_invocation_count(0));
   521   if (mcs != NULL) {
   522     mcs->backedge_counter()->init();
   523     mcs->invocation_counter()->init();
   524     mcs->set_interpreter_invocation_count(0);
   525     mcs->set_interpreter_throwout_count(0);
   527 #ifdef TIERED
   528     mcs->set_rate(0.0F);
   529     mh->set_prev_event_count(0, THREAD);
   530     mh->set_prev_time(0, THREAD);
   531 #endif
   532   }
   533 WB_END
   535 template <typename T>
   536 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAt)(const char*, T*)) {
   537   if (name == NULL) {
   538     return false;
   539   }
   540   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   541   const char* flag_name = env->GetStringUTFChars(name, NULL);
   542   bool result = (*TAt)(flag_name, value);
   543   env->ReleaseStringUTFChars(name, flag_name);
   544   return result;
   545 }
   547 template <typename T>
   548 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAtPut)(const char*, T*, Flag::Flags)) {
   549   if (name == NULL) {
   550     return false;
   551   }
   552   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   553   const char* flag_name = env->GetStringUTFChars(name, NULL);
   554   bool result = (*TAtPut)(flag_name, value, Flag::INTERNAL);
   555   env->ReleaseStringUTFChars(name, flag_name);
   556   return result;
   557 }
   559 template <typename T>
   560 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {
   561   ResourceMark rm(thread);
   562   jclass clazz = env->FindClass(name->as_C_string());
   563   CHECK_JNI_EXCEPTION_(env, NULL);
   564   jmethodID methodID = env->GetStaticMethodID(clazz,
   565         vmSymbols::valueOf_name()->as_C_string(),
   566         sig->as_C_string());
   567   CHECK_JNI_EXCEPTION_(env, NULL);
   568   jobject result = env->CallStaticObjectMethod(clazz, methodID, value);
   569   CHECK_JNI_EXCEPTION_(env, NULL);
   570   return result;
   571 }
   573 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {
   574   return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);
   575 }
   576 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {
   577   return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);
   578 }
   579 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {
   580   return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);
   581 }
   582 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {
   583   return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);
   584 }*/
   585 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {
   586   return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);
   587 }
   589 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))
   590   bool result;
   591   if (GetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAt)) {
   592     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   593     return booleanBox(thread, env, result);
   594   }
   595   return NULL;
   596 WB_END
   598 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))
   599   intx result;
   600   if (GetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAt)) {
   601     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   602     return longBox(thread, env, result);
   603   }
   604   return NULL;
   605 WB_END
   607 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))
   608   uintx result;
   609   if (GetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAt)) {
   610     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   611     return longBox(thread, env, result);
   612   }
   613   return NULL;
   614 WB_END
   616 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))
   617   uint64_t result;
   618   if (GetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAt)) {
   619     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   620     return longBox(thread, env, result);
   621   }
   622   return NULL;
   623 WB_END
   625 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))
   626   double result;
   627   if (GetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAt)) {
   628     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   629     return doubleBox(thread, env, result);
   630   }
   631   return NULL;
   632 WB_END
   634 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))
   635   ccstr ccstrResult;
   636   if (GetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAt)) {
   637     ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   638     jstring result = env->NewStringUTF(ccstrResult);
   639     CHECK_JNI_EXCEPTION_(env, NULL);
   640     return result;
   641   }
   642   return NULL;
   643 WB_END
   645 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))
   646   bool result = value == JNI_TRUE ? true : false;
   647   SetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAtPut);
   648 WB_END
   650 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
   651   intx result = value;
   652   SetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAtPut);
   653 WB_END
   655 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
   656   uintx result = value;
   657   SetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAtPut);
   658 WB_END
   660 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))
   661   uint64_t result = value;
   662   SetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAtPut);
   663 WB_END
   665 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))
   666   double result = value;
   667   SetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAtPut);
   668 WB_END
   670 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))
   671   ThreadToNativeFromVM ttnfv(thread);   // can't be in VM when we call JNI
   672   const char* ccstrValue = (value == NULL) ? NULL : env->GetStringUTFChars(value, NULL);
   673   ccstr ccstrResult = ccstrValue;
   674   bool needFree;
   675   {
   676     ThreadInVMfromNative ttvfn(thread); // back to VM
   677     needFree = SetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAtPut);
   678   }
   679   if (value != NULL) {
   680     env->ReleaseStringUTFChars(value, ccstrValue);
   681   }
   682   if (needFree) {
   683     FREE_C_HEAP_ARRAY(char, ccstrResult, mtInternal);
   684   }
   685 WB_END
   688 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))
   689   ResourceMark rm(THREAD);
   690   int len;
   691   jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
   692   return (StringTable::lookup(name, len) != NULL);
   693 WB_END
   695 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
   696   Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);
   697   Universe::heap()->collect(GCCause::_last_ditch_collection);
   698 WB_END
   700 WB_ENTRY(void, WB_YoungGC(JNIEnv* env, jobject o))
   701   Universe::heap()->collect(GCCause::_wb_young_gc);
   702 WB_END
   704 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))
   705   // static+volatile in order to force the read to happen
   706   // (not be eliminated by the compiler)
   707   static char c;
   708   static volatile char* p;
   710   p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);
   711   if (p == NULL) {
   712     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");
   713   }
   715   c = *p;
   716 WB_END
   718 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))
   719   const char* cpu_features = VM_Version::cpu_features();
   720   ThreadToNativeFromVM ttn(thread);
   721   jstring features_string = env->NewStringUTF(cpu_features);
   723   CHECK_JNI_EXCEPTION_(env, NULL);
   725   return features_string;
   726 WB_END
   729 WB_ENTRY(jobjectArray, WB_GetNMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   730   ResourceMark rm(THREAD);
   731   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
   732   CHECK_JNI_EXCEPTION_(env, NULL);
   733   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   734   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
   735   jobjectArray result = NULL;
   736   if (code == NULL) {
   737     return result;
   738   }
   739   int insts_size = code->insts_size();
   741   ThreadToNativeFromVM ttn(thread);
   742   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());
   743   CHECK_JNI_EXCEPTION_(env, NULL);
   744   result = env->NewObjectArray(2, clazz, NULL);
   745   if (result == NULL) {
   746     return result;
   747   }
   749   jobject obj = integerBox(thread, env, code->comp_level());
   750   CHECK_JNI_EXCEPTION_(env, NULL);
   751   env->SetObjectArrayElement(result, 0, obj);
   753   jbyteArray insts = env->NewByteArray(insts_size);
   754   CHECK_JNI_EXCEPTION_(env, NULL);
   755   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());
   756   env->SetObjectArrayElement(result, 1, insts);
   758   return result;
   759 WB_END
   762 int WhiteBox::array_bytes_to_length(size_t bytes) {
   763   return Array<u1>::bytes_to_length(bytes);
   764 }
   766 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))
   767   if (size < 0) {
   768     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),
   769         err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));
   770   }
   772   oop class_loader_oop = JNIHandles::resolve(class_loader);
   773   ClassLoaderData* cld = class_loader_oop != NULL
   774       ? java_lang_ClassLoader::loader_data(class_loader_oop)
   775       : ClassLoaderData::the_null_class_loader_data();
   777   void* metadata = MetadataFactory::new_writeable_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
   779   return (jlong)(uintptr_t)metadata;
   780 WB_END
   782 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))
   783   oop class_loader_oop = JNIHandles::resolve(class_loader);
   784   ClassLoaderData* cld = class_loader_oop != NULL
   785       ? java_lang_ClassLoader::loader_data(class_loader_oop)
   786       : ClassLoaderData::the_null_class_loader_data();
   788   MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);
   789 WB_END
   791 //Some convenience methods to deal with objects from java
   792 int WhiteBox::offset_for_field(const char* field_name, oop object,
   793     Symbol* signature_symbol) {
   794   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
   795   Thread* THREAD = Thread::current();
   797   //Get the class of our object
   798   Klass* arg_klass = object->klass();
   799   //Turn it into an instance-klass
   800   InstanceKlass* ik = InstanceKlass::cast(arg_klass);
   802   //Create symbols to look for in the class
   803   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
   804       THREAD);
   806   //To be filled in with an offset of the field we're looking for
   807   fieldDescriptor fd;
   809   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);
   810   if (res == NULL) {
   811     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
   812         name_symbol->as_C_string());
   813     fatal("Invalid layout of preloaded class");
   814   }
   816   //fetch the field at the offset we've found
   817   int dest_offset = fd.offset();
   819   return dest_offset;
   820 }
   823 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
   824   int offset = offset_for_field(field_name, object,
   825       vmSymbols::string_signature());
   826   oop string = object->obj_field(offset);
   827   if (string == NULL) {
   828     return NULL;
   829   }
   830   const char* ret = java_lang_String::as_utf8_string(string);
   831   return ret;
   832 }
   834 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
   835   int offset =
   836       offset_for_field(field_name, object, vmSymbols::bool_signature());
   837   bool ret = (object->bool_field(offset) == JNI_TRUE);
   838   return ret;
   839 }
   842 #define CC (char*)
   844 static JNINativeMethod methods[] = {
   845   {CC"getObjectAddress",   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },
   846   {CC"getObjectSize",      CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectSize     },
   847   {CC"isObjectInOldGen",   CC"(Ljava/lang/Object;)Z", (void*)&WB_isObjectInOldGen  },
   848   {CC"getHeapOopSize",     CC"()I",                   (void*)&WB_GetHeapOopSize    },
   849   {CC"isClassAlive0",      CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },
   850   {CC"parseCommandLine",
   851       CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
   852       (void*) &WB_ParseCommandLine
   853   },
   854   {CC"getCompressedOopsMaxHeapSize", CC"()J",
   855       (void*)&WB_GetCompressedOopsMaxHeapSize},
   856   {CC"printHeapSizes",     CC"()V",                   (void*)&WB_PrintHeapSizes    },
   857   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},
   858   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},
   859   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},
   860 #if INCLUDE_ALL_GCS
   861   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},
   862   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },
   863   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },
   864   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },
   865 #endif // INCLUDE_ALL_GCS
   866 #if INCLUDE_NMT
   867   {CC"NMTMalloc",           CC"(J)J",                 (void*)&WB_NMTMalloc          },
   868   {CC"NMTMallocWithPseudoStack", CC"(JI)J",           (void*)&WB_NMTMallocWithPseudoStack},
   869   {CC"NMTFree",             CC"(J)V",                 (void*)&WB_NMTFree            },
   870   {CC"NMTReserveMemory",    CC"(J)J",                 (void*)&WB_NMTReserveMemory   },
   871   {CC"NMTCommitMemory",     CC"(JJ)V",                (void*)&WB_NMTCommitMemory    },
   872   {CC"NMTUncommitMemory",   CC"(JJ)V",                (void*)&WB_NMTUncommitMemory  },
   873   {CC"NMTReleaseMemory",    CC"(JJ)V",                (void*)&WB_NMTReleaseMemory   },
   874   {CC"NMTOverflowHashBucket", CC"(J)V",               (void*)&WB_NMTOverflowHashBucket},
   875   {CC"NMTIsDetailSupported",CC"()Z",                  (void*)&WB_NMTIsDetailSupported},
   876 #endif // INCLUDE_NMT
   877   {CC"deoptimizeAll",      CC"()V",                   (void*)&WB_DeoptimizeAll     },
   878   {CC"deoptimizeMethod",   CC"(Ljava/lang/reflect/Executable;Z)I",
   879                                                       (void*)&WB_DeoptimizeMethod  },
   880   {CC"isMethodCompiled",   CC"(Ljava/lang/reflect/Executable;Z)Z",
   881                                                       (void*)&WB_IsMethodCompiled  },
   882   {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",
   883                                                       (void*)&WB_IsMethodCompilable},
   884   {CC"isMethodQueuedForCompilation",
   885       CC"(Ljava/lang/reflect/Executable;)Z",          (void*)&WB_IsMethodQueuedForCompilation},
   886   {CC"makeMethodNotCompilable",
   887       CC"(Ljava/lang/reflect/Executable;IZ)V",        (void*)&WB_MakeMethodNotCompilable},
   888   {CC"testSetDontInlineMethod",
   889       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetDontInlineMethod},
   890   {CC"getMethodCompilationLevel",
   891       CC"(Ljava/lang/reflect/Executable;Z)I",         (void*)&WB_GetMethodCompilationLevel},
   892   {CC"getMethodEntryBci",
   893       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodEntryBci},
   894   {CC"getCompileQueueSize",
   895       CC"(I)I",                                       (void*)&WB_GetCompileQueueSize},
   896   {CC"testSetForceInlineMethod",
   897       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetForceInlineMethod},
   898   {CC"enqueueMethodForCompilation",
   899       CC"(Ljava/lang/reflect/Executable;II)Z",        (void*)&WB_EnqueueMethodForCompilation},
   900   {CC"clearMethodState",
   901       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_ClearMethodState},
   902   {CC"setBooleanVMFlag",   CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},
   903   {CC"setIntxVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},
   904   {CC"setUintxVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},
   905   {CC"setUint64VMFlag",    CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},
   906   {CC"setDoubleVMFlag",    CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},
   907   {CC"setStringVMFlag",    CC"(Ljava/lang/String;Ljava/lang/String;)V",
   908                                                       (void*)&WB_SetStringVMFlag},
   909   {CC"getBooleanVMFlag",   CC"(Ljava/lang/String;)Ljava/lang/Boolean;",
   910                                                       (void*)&WB_GetBooleanVMFlag},
   911   {CC"getIntxVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",
   912                                                       (void*)&WB_GetIntxVMFlag},
   913   {CC"getUintxVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",
   914                                                       (void*)&WB_GetUintxVMFlag},
   915   {CC"getUint64VMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Long;",
   916                                                       (void*)&WB_GetUint64VMFlag},
   917   {CC"getDoubleVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Double;",
   918                                                       (void*)&WB_GetDoubleVMFlag},
   919   {CC"getStringVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/String;",
   920                                                       (void*)&WB_GetStringVMFlag},
   921   {CC"isInStringTable",    CC"(Ljava/lang/String;)Z", (void*)&WB_IsInStringTable  },
   922   {CC"fullGC",   CC"()V",                             (void*)&WB_FullGC },
   923   {CC"youngGC",  CC"()V",                             (void*)&WB_YoungGC },
   924   {CC"readReservedMemory", CC"()V",                   (void*)&WB_ReadReservedMemory },
   925   {CC"allocateMetaspace",
   926      CC"(Ljava/lang/ClassLoader;J)J",                 (void*)&WB_AllocateMetaspace },
   927   {CC"freeMetaspace",
   928      CC"(Ljava/lang/ClassLoader;JJ)V",                (void*)&WB_FreeMetaspace },
   929   {CC"getCPUFeatures",     CC"()Ljava/lang/String;",  (void*)&WB_GetCPUFeatures     },
   930   {CC"getNMethod",         CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",
   931                                                       (void*)&WB_GetNMethod         },
   932 };
   934 #undef CC
   936 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
   937   {
   938     if (WhiteBoxAPI) {
   939       // Make sure that wbclass is loaded by the null classloader
   940       instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
   941       Handle loader(ikh->class_loader());
   942       if (loader.is_null()) {
   943         ResourceMark rm;
   944         ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
   945         bool result = true;
   946         //  one by one registration natives for exception catching
   947         jclass exceptionKlass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
   948         CHECK_JNI_EXCEPTION(env);
   949         for (int i = 0, n = sizeof(methods) / sizeof(methods[0]); i < n; ++i) {
   950           if (env->RegisterNatives(wbclass, methods + i, 1) != 0) {
   951             result = false;
   952             jthrowable throwable_obj = env->ExceptionOccurred();
   953             if (throwable_obj != NULL) {
   954               env->ExceptionClear();
   955               if (env->IsInstanceOf(throwable_obj, exceptionKlass)) {
   956                 // j.l.NoSuchMethodError is thrown when a method can't be found or a method is not native
   957                 // ignoring the exception
   958                 tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s", methods[i].name, methods[i].signature);
   959               }
   960             } else {
   961               // register is failed w/o exception or w/ unexpected exception
   962               tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered", methods[i].name, methods[i].signature);
   963               env->UnregisterNatives(wbclass);
   964               break;
   965             }
   966           }
   967         }
   969         if (result) {
   970           WhiteBox::set_used();
   971         }
   972       }
   973     }
   974   }
   975 JVM_END

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