Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "memory/universe.hpp"

 #include "oops/oop.inline.hpp"

 #include "classfile/symbolTable.hpp"

 #include "classfile/classLoaderData.hpp"

 #include "prims/whitebox.hpp"

 #include "prims/wbtestmethods/parserTests.hpp"

 #include "runtime/arguments.hpp"

 #include "runtime/interfaceSupport.hpp"

 #include "runtime/os.hpp"

 #include "utilities/debug.hpp"

 #include "utilities/macros.hpp"

 #include "utilities/exceptions.hpp"

 #if INCLUDE_ALL_GCS

 #include "gc_implementation/g1/concurrentMark.hpp"

 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"

 #include "gc_implementation/g1/heapRegionRemSet.hpp"

 #endif // INCLUDE_ALL_GCS

 #ifdef INCLUDE_NMT

 #include "services/memTracker.hpp"

 #endif // INCLUDE_NMT

 #include "compiler/compileBroker.hpp"

 #include "runtime/compilationPolicy.hpp"

 #define SIZE_T_MAX_VALUE ((size_t) -1)

 bool WhiteBox::_used = false;

 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))

   return (jlong)(void*)JNIHandles::resolve(obj);

 WB_END

 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))

   return heapOopSize;

 WB_END

 class WBIsKlassAliveClosure : public KlassClosure {

     Symbol* _name;

     bool _found;

 public:

     WBIsKlassAliveClosure(Symbol* name) : _name(name), _found(false) {}

     void do_klass(Klass* k) {

       if (_found) return;

       Symbol* ksym = k->name();

       if (ksym->fast_compare(_name) == 0) {

         _found = true;

       }

     }

     bool found() const {

         return _found;

     }

 };

 WB_ENTRY(jboolean, WB_IsClassAlive(JNIEnv* env, jobject target, jstring name))

   Handle h_name = JNIHandles::resolve(name);

   if (h_name.is_null()) return false;

   Symbol* sym = java_lang_String::as_symbol(h_name, CHECK_false);

   TempNewSymbol tsym(sym); // Make sure to decrement reference count on sym on return

   WBIsKlassAliveClosure closure(sym);

   ClassLoaderDataGraph::classes_do(&closure);

   return closure.found();

 WB_END

 WB_ENTRY(jlong, WB_GetCompressedOopsMaxHeapSize(JNIEnv* env, jobject o)) {

   return (jlong)Arguments::max_heap_for_compressed_oops();

 }

 WB_END

 WB_ENTRY(void, WB_PrintHeapSizes(JNIEnv* env, jobject o)) {

   CollectorPolicy * p = Universe::heap()->collector_policy();

   gclog_or_tty->print_cr("Minimum heap "SIZE_FORMAT" Initial heap "

     SIZE_FORMAT" Maximum heap "SIZE_FORMAT" Min alignment "SIZE_FORMAT" Max alignment "SIZE_FORMAT,

     p->min_heap_byte_size(), p->initial_heap_byte_size(), p->max_heap_byte_size(),

     p->space_alignment(), p->heap_alignment());

 }

 WB_END

 #ifndef PRODUCT

 // Forward declaration

 void TestReservedSpace_test();

 void TestReserveMemorySpecial_test();

 void TestVirtualSpace_test();

 void TestMetaspaceAux_test();

 #endif

 WB_ENTRY(void, WB_RunMemoryUnitTests(JNIEnv* env, jobject o))

 #ifndef PRODUCT

   TestReservedSpace_test();

   TestReserveMemorySpecial_test();

   TestVirtualSpace_test();

   TestMetaspaceAux_test();

 #endif

 WB_END

 WB_ENTRY(void, WB_ReadFromNoaccessArea(JNIEnv* env, jobject o))

   size_t granularity = os::vm_allocation_granularity();

   ReservedHeapSpace rhs(100 * granularity, granularity, false, NULL);

   VirtualSpace vs;

   vs.initialize(rhs, 50 * granularity);

   //Check if constraints are complied

   if (!( UseCompressedOops && rhs.base() != NULL &&

          Universe::narrow_oop_base() != NULL &&

          Universe::narrow_oop_use_implicit_null_checks() )) {

     tty->print_cr("WB_ReadFromNoaccessArea method is useless:\n "

                   "\tUseCompressedOops is %d\n"

                   "\trhs.base() is "PTR_FORMAT"\n"

                   "\tUniverse::narrow_oop_base() is "PTR_FORMAT"\n"

                   "\tUniverse::narrow_oop_use_implicit_null_checks() is %d",

                   UseCompressedOops,

                   rhs.base(),

                   Universe::narrow_oop_base(),

                   Universe::narrow_oop_use_implicit_null_checks());

     return;

   }

   tty->print_cr("Reading from no access area... ");

   tty->print_cr("*(vs.low_boundary() - rhs.noaccess_prefix() / 2 ) = %c",

                 *(vs.low_boundary() - rhs.noaccess_prefix() / 2 ));

 WB_END

 static jint wb_stress_virtual_space_resize(size_t reserved_space_size,

                                            size_t magnitude, size_t iterations) {

   size_t granularity = os::vm_allocation_granularity();

   ReservedHeapSpace rhs(reserved_space_size * granularity, granularity, false, NULL);

   VirtualSpace vs;

   if (!vs.initialize(rhs, 0)) {

     tty->print_cr("Failed to initialize VirtualSpace. Can't proceed.");

     return 3;

   }

   long seed = os::random();

   tty->print_cr("Random seed is %ld", seed);

   os::init_random(seed);

   for (size_t i = 0; i < iterations; i++) {

     // Whether we will shrink or grow

     bool shrink = os::random() % 2L == 0;

     // Get random delta to resize virtual space

     size_t delta = (size_t)os::random() % magnitude;

     // If we are about to shrink virtual space below zero, then expand instead

     if (shrink && vs.committed_size() < delta) {

       shrink = false;

     }

     // Resizing by delta

     if (shrink) {

       vs.shrink_by(delta);

     } else {

       // If expanding fails expand_by will silently return false

       vs.expand_by(delta, true);

     }

   }

   return 0;

 }

 WB_ENTRY(jint, WB_StressVirtualSpaceResize(JNIEnv* env, jobject o,

         jlong reserved_space_size, jlong magnitude, jlong iterations))

   tty->print_cr("reservedSpaceSize="JLONG_FORMAT", magnitude="JLONG_FORMAT", "

                 "iterations="JLONG_FORMAT"\n", reserved_space_size, magnitude,

                 iterations);

   if (reserved_space_size < 0 || magnitude < 0 || iterations < 0) {

     tty->print_cr("One of variables printed above is negative. Can't proceed.\n");

     return 1;

   }

   // sizeof(size_t) depends on whether OS is 32bit or 64bit. sizeof(jlong) is

   // always 8 byte. That's why we should avoid overflow in case of 32bit platform.

   if (sizeof(size_t) < sizeof(jlong)) {

     jlong size_t_max_value = (jlong) SIZE_T_MAX_VALUE;

     if (reserved_space_size > size_t_max_value || magnitude > size_t_max_value

         || iterations > size_t_max_value) {

       tty->print_cr("One of variables printed above overflows size_t. Can't proceed.\n");

       return 2;

     }

   }

   return wb_stress_virtual_space_resize((size_t) reserved_space_size,

                                         (size_t) magnitude, (size_t) iterations);

 WB_END

 #if INCLUDE_ALL_GCS

 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   oop result = JNIHandles::resolve(obj);

   const HeapRegion* hr = g1->heap_region_containing(result);

   return hr->isHumongous();

 WB_END

 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   size_t nr = g1->free_regions();

   return (jlong)nr;

 WB_END

 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   ConcurrentMark* cm = g1->concurrent_mark();

   return cm->concurrent_marking_in_progress();

 WB_END

 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))

   return (jint)HeapRegion::GrainBytes;

 WB_END

 #endif // INCLUDE_ALL_GCS

 #if INCLUDE_NMT

 // Alloc memory using the test memory type so that we can use that to see if

 // NMT picks it up correctly

 WB_ENTRY(jlong, WB_NMTMalloc(JNIEnv* env, jobject o, jlong size))

   jlong addr = 0;

   if (MemTracker::is_on() && !MemTracker::shutdown_in_progress()) {

     addr = (jlong)(uintptr_t)os::malloc(size, mtTest);

   }

   return addr;

 WB_END

 // Free the memory allocated by NMTAllocTest

 WB_ENTRY(void, WB_NMTFree(JNIEnv* env, jobject o, jlong mem))

   os::free((void*)(uintptr_t)mem, mtTest);

 WB_END

 WB_ENTRY(jlong, WB_NMTReserveMemory(JNIEnv* env, jobject o, jlong size))

   jlong addr = 0;

   if (MemTracker::is_on() && !MemTracker::shutdown_in_progress()) {

     addr = (jlong)(uintptr_t)os::reserve_memory(size);

     MemTracker::record_virtual_memory_type((address)addr, mtTest);

   }

   return addr;

 WB_END

 WB_ENTRY(void, WB_NMTCommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))

   os::commit_memory((char *)(uintptr_t)addr, size, !ExecMem);

   MemTracker::record_virtual_memory_type((address)(uintptr_t)addr, mtTest);

 WB_END

 WB_ENTRY(void, WB_NMTUncommitMemory(JNIEnv* env, jobject o, jlong addr, jlong size))

   os::uncommit_memory((char *)(uintptr_t)addr, size);

 WB_END

 WB_ENTRY(void, WB_NMTReleaseMemory(JNIEnv* env, jobject o, jlong addr, jlong size))

   os::release_memory((char *)(uintptr_t)addr, size);

 WB_END

 // Block until the current generation of NMT data to be merged, used to reliably test the NMT feature

 WB_ENTRY(jboolean, WB_NMTWaitForDataMerge(JNIEnv* env))

   if (!MemTracker::is_on() || MemTracker::shutdown_in_progress()) {

     return false;

   }

   return MemTracker::wbtest_wait_for_data_merge();

 WB_END

 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))

   return MemTracker::tracking_level() == MemTracker::NMT_detail;

 WB_END

 #endif // INCLUDE_NMT

 static jmethodID reflected_method_to_jmid(JavaThread* thread, JNIEnv* env, jobject method) {

   assert(method != NULL, "method should not be null");

   ThreadToNativeFromVM ttn(thread);

   return env->FromReflectedMethod(method);

 }

 WB_ENTRY(void, WB_DeoptimizeAll(JNIEnv* env, jobject o))

   MutexLockerEx mu(Compile_lock);

   CodeCache::mark_all_nmethods_for_deoptimization();

   VM_Deoptimize op;

   VMThread::execute(&op);

 WB_END

 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   MutexLockerEx mu(Compile_lock);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   int result = 0;

   nmethod* code;

   if (is_osr) {

     int bci = InvocationEntryBci;

     while ((code = mh->lookup_osr_nmethod_for(bci, CompLevel_none, false)) != NULL) {

       code->mark_for_deoptimization();

       ++result;

       bci = code->osr_entry_bci() + 1;

     }

   } else {

     code = mh->code();

   }

   if (code != NULL) {

     code->mark_for_deoptimization();

     ++result;

   }

   result += CodeCache::mark_for_deoptimization(mh());

   if (result > 0) {

     VM_Deoptimize op;

     VMThread::execute(&op);

   }

   return result;

 WB_END

 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   MutexLockerEx mu(Compile_lock);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();

   if (code == NULL) {

     return JNI_FALSE;

   }

   return (code->is_alive() && !code->is_marked_for_deoptimization());

 WB_END

 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   MutexLockerEx mu(Compile_lock);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   if (is_osr) {

     return CompilationPolicy::can_be_osr_compiled(mh, comp_level);

   } else {

     return CompilationPolicy::can_be_compiled(mh, comp_level);

   }

 WB_END

 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   MutexLockerEx mu(Compile_lock);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   return mh->queued_for_compilation();

 WB_END

 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();

   return (code != NULL ? code->comp_level() : CompLevel_none);

 WB_END

 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   if (is_osr) {

     mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");

   } else {

     mh->set_not_compilable(comp_level, true /* report */, "WhiteBox");

   }

 WB_END

 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);

   return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);

 WB_END

 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   bool result = mh->dont_inline();

   mh->set_dont_inline(value == JNI_TRUE);

   return result;

 WB_END

 WB_ENTRY(jint, WB_GetCompileQueueSize(JNIEnv* env, jobject o, jint comp_level))

   if (comp_level == CompLevel_any) {

     return CompileBroker::queue_size(CompLevel_full_optimization) /* C2 */ +

         CompileBroker::queue_size(CompLevel_full_profile) /* C1 */;

   } else {

     return CompileBroker::queue_size(comp_level);

   }

 WB_END

 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   bool result = mh->force_inline();

   mh->set_force_inline(value == JNI_TRUE);

   return result;

 WB_END

 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);

   MutexLockerEx mu(Compile_lock);

   return (mh->queued_for_compilation() || nm != NULL);

 WB_END

 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))

   jmethodID jmid = reflected_method_to_jmid(thread, env, method);

   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));

   MutexLockerEx mu(Compile_lock);

   MethodData* mdo = mh->method_data();

   MethodCounters* mcs = mh->method_counters();

   if (mdo != NULL) {

     mdo->init();

     ResourceMark rm;

     int arg_count = mdo->method()->size_of_parameters();

     for (int i = 0; i < arg_count; i++) {

       mdo->set_arg_modified(i, 0);

     }

   }

   mh->clear_not_c1_compilable();

   mh->clear_not_c2_compilable();

   mh->clear_not_c2_osr_compilable();

   NOT_PRODUCT(mh->set_compiled_invocation_count(0));

   if (mcs != NULL) {

     mcs->backedge_counter()->init();

     mcs->invocation_counter()->init();

     mcs->set_interpreter_invocation_count(0);

     mcs->set_interpreter_throwout_count(0);

 #ifdef TIERED

     mcs->set_rate(0.0F);

     mh->set_prev_event_count(0, THREAD);

     mh->set_prev_time(0, THREAD);

 #endif

   }

 WB_END

 WB_ENTRY(jboolean, WB_IsInStringTable(JNIEnv* env, jobject o, jstring javaString))

   ResourceMark rm(THREAD);

   int len;

   jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);

   return (StringTable::lookup(name, len) != NULL);

 WB_END

 WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))

   Universe::heap()->collector_policy()->set_should_clear_all_soft_refs(true);

   Universe::heap()->collect(GCCause::_last_ditch_collection);

 WB_END

 WB_ENTRY(void, WB_ReadReservedMemory(JNIEnv* env, jobject o))

   // static+volatile in order to force the read to happen

   // (not be eliminated by the compiler)

   static char c;

   static volatile char* p;

   p = os::reserve_memory(os::vm_allocation_granularity(), NULL, 0);

   if (p == NULL) {

     THROW_MSG(vmSymbols::java_lang_OutOfMemoryError(), "Failed to reserve memory");

   }

   c = *p;

 WB_END

 //Some convenience methods to deal with objects from java

 int WhiteBox::offset_for_field(const char* field_name, oop object,

     Symbol* signature_symbol) {

   assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");

   Thread* THREAD = Thread::current();

   //Get the class of our object

   Klass* arg_klass = object->klass();

   //Turn it into an instance-klass

   InstanceKlass* ik = InstanceKlass::cast(arg_klass);

   //Create symbols to look for in the class

   TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),

       THREAD);

   //To be filled in with an offset of the field we're looking for

   fieldDescriptor fd;

   Klass* res = ik->find_field(name_symbol, signature_symbol, &fd);

   if (res == NULL) {

     tty->print_cr("Invalid layout of %s at %s", ik->external_name(),

         name_symbol->as_C_string());

     fatal("Invalid layout of preloaded class");

   }

   //fetch the field at the offset we've found

   int dest_offset = fd.offset();

   return dest_offset;

 }

 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {

   int offset = offset_for_field(field_name, object,

       vmSymbols::string_signature());

   oop string = object->obj_field(offset);

   if (string == NULL) {

     return NULL;

   }

   const char* ret = java_lang_String::as_utf8_string(string);

   return ret;

 }

 bool WhiteBox::lookup_bool(const char* field_name, oop object) {

   int offset =

       offset_for_field(field_name, object, vmSymbols::bool_signature());

   bool ret = (object->bool_field(offset) == JNI_TRUE);

   return ret;

 }

 #define CC (char*)

 static JNINativeMethod methods[] = {

   {CC"getObjectAddress",   CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress  },

   {CC"getHeapOopSize",     CC"()I",                   (void*)&WB_GetHeapOopSize    },

   {CC"isClassAlive0",      CC"(Ljava/lang/String;)Z", (void*)&WB_IsClassAlive      },

   {CC"parseCommandLine",

       CC"(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",

       (void*) &WB_ParseCommandLine

   },

   {CC"getCompressedOopsMaxHeapSize", CC"()J",

       (void*)&WB_GetCompressedOopsMaxHeapSize},

   {CC"printHeapSizes",     CC"()V",                   (void*)&WB_PrintHeapSizes    },

   {CC"runMemoryUnitTests", CC"()V",                   (void*)&WB_RunMemoryUnitTests},

   {CC"readFromNoaccessArea",CC"()V",                  (void*)&WB_ReadFromNoaccessArea},

   {CC"stressVirtualSpaceResize",CC"(JJJ)I",           (void*)&WB_StressVirtualSpaceResize},

 #if INCLUDE_ALL_GCS

   {CC"g1InConcurrentMark", CC"()Z",                   (void*)&WB_G1InConcurrentMark},

   {CC"g1IsHumongous",      CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous     },

   {CC"g1NumFreeRegions",   CC"()J",                   (void*)&WB_G1NumFreeRegions  },

   {CC"g1RegionSize",       CC"()I",                   (void*)&WB_G1RegionSize      },

 #endif // INCLUDE_ALL_GCS

 #if INCLUDE_NMT

   {CC"NMTMalloc",           CC"(J)J",                 (void*)&WB_NMTMalloc          },

   {CC"NMTFree",             CC"(J)V",                 (void*)&WB_NMTFree            },

   {CC"NMTReserveMemory",    CC"(J)J",                 (void*)&WB_NMTReserveMemory   },

   {CC"NMTCommitMemory",     CC"(JJ)V",                (void*)&WB_NMTCommitMemory    },

   {CC"NMTUncommitMemory",   CC"(JJ)V",                (void*)&WB_NMTUncommitMemory  },

   {CC"NMTReleaseMemory",    CC"(JJ)V",                (void*)&WB_NMTReleaseMemory   },

   {CC"NMTWaitForDataMerge", CC"()Z",                  (void*)&WB_NMTWaitForDataMerge},

   {CC"NMTIsDetailSupported",CC"()Z",                  (void*)&WB_NMTIsDetailSupported},

 #endif // INCLUDE_NMT

   {CC"deoptimizeAll",      CC"()V",                   (void*)&WB_DeoptimizeAll     },

   {CC"deoptimizeMethod",   CC"(Ljava/lang/reflect/Executable;Z)I",

                                                       (void*)&WB_DeoptimizeMethod  },

   {CC"isMethodCompiled",   CC"(Ljava/lang/reflect/Executable;Z)Z",

                                                       (void*)&WB_IsMethodCompiled  },

   {CC"isMethodCompilable", CC"(Ljava/lang/reflect/Executable;IZ)Z",

                                                       (void*)&WB_IsMethodCompilable},

   {CC"isMethodQueuedForCompilation",

       CC"(Ljava/lang/reflect/Executable;)Z",          (void*)&WB_IsMethodQueuedForCompilation},

   {CC"makeMethodNotCompilable",

       CC"(Ljava/lang/reflect/Executable;IZ)V",        (void*)&WB_MakeMethodNotCompilable},

   {CC"testSetDontInlineMethod",

       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetDontInlineMethod},

   {CC"getMethodCompilationLevel",

       CC"(Ljava/lang/reflect/Executable;Z)I",         (void*)&WB_GetMethodCompilationLevel},

   {CC"getMethodEntryBci",

       CC"(Ljava/lang/reflect/Executable;)I",          (void*)&WB_GetMethodEntryBci},

   {CC"getCompileQueueSize",

       CC"(I)I",                                       (void*)&WB_GetCompileQueueSize},

   {CC"testSetForceInlineMethod",

       CC"(Ljava/lang/reflect/Executable;Z)Z",         (void*)&WB_TestSetForceInlineMethod},

   {CC"enqueueMethodForCompilation",

       CC"(Ljava/lang/reflect/Executable;II)Z",        (void*)&WB_EnqueueMethodForCompilation},

   {CC"clearMethodState",

       CC"(Ljava/lang/reflect/Executable;)V",          (void*)&WB_ClearMethodState},

   {CC"isInStringTable",   CC"(Ljava/lang/String;)Z",  (void*)&WB_IsInStringTable  },

   {CC"fullGC",   CC"()V",                             (void*)&WB_FullGC },

   {CC"readReservedMemory", CC"()V",                   (void*)&WB_ReadReservedMemory },

 };

 #undef CC

 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))

   {

     if (WhiteBoxAPI) {

       // Make sure that wbclass is loaded by the null classloader

       instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());

       Handle loader(ikh->class_loader());

       if (loader.is_null()) {

         ResourceMark rm;

         ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI

         bool result = true;

         //  one by one registration natives for exception catching

         jclass exceptionKlass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());

         for (int i = 0, n = sizeof(methods) / sizeof(methods[0]); i < n; ++i) {

           if (env->RegisterNatives(wbclass, methods + i, 1) != 0) {

             result = false;

             if (env->ExceptionCheck() && env->IsInstanceOf(env->ExceptionOccurred(), exceptionKlass)) {

               // j.l.NoSuchMethodError is thrown when a method can't be found or a method is not native

               // ignoring the exception

               tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s", methods[i].name, methods[i].signature);

               env->ExceptionClear();

             } else {

               // register is failed w/o exception or w/ unexpected exception

               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);

               env->UnregisterNatives(wbclass);

               break;

             }

           }

         }

         if (result) {

           WhiteBox::set_used();

         }

       }

     }

   }

 JVM_END