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

 /*

  * Copyright (c) 2012, 2019, 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/metadataFactory.hpp"

 #include "memory/metaspaceShared.hpp"

 #include "memory/iterator.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/array.hpp"

 #include "utilities/align.hpp"

 #include "utilities/debug.hpp"

 #include "utilities/macros.hpp"

 #include "utilities/exceptions.hpp"

 #if INCLUDE_ALL_GCS

 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.inline.hpp"

 #include "gc_implementation/g1/concurrentMark.hpp"

 #include "gc_implementation/g1/concurrentMarkThread.hpp"

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

 #include "gc_implementation/g1/heapRegionRemSet.hpp"

 #endif // INCLUDE_ALL_GCS

 #if INCLUDE_NMT

 #include "services/mallocSiteTable.hpp"

 #include "services/memTracker.hpp"

 #include "utilities/nativeCallStack.hpp"

 #endif // INCLUDE_NMT

 #include "compiler/compileBroker.hpp"

 #include "jvmtifiles/jvmtiEnv.hpp"

 #include "runtime/compilationPolicy.hpp"

 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

 #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

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

   return os::vm_page_size();

 WB_END

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

   return os::large_page_size();

 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(jboolean, WB_ClassKnownToNotExist(JNIEnv* env, jobject o, jobject loader, jstring name))

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

   const char* class_name = env->GetStringUTFChars(name, NULL);

   jboolean result = JVM_KnownToNotExist(env, loader, class_name);

   env->ReleaseStringUTFChars(name, class_name);

   return result;

 WB_END

 WB_ENTRY(jobjectArray, WB_GetLookupCacheURLs(JNIEnv* env, jobject o, jobject loader))

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

   return JVM_GetResourceLookupCacheURLs(env, loader);

 WB_END

 WB_ENTRY(jintArray, WB_GetLookupCacheMatches(JNIEnv* env, jobject o, jobject loader, jstring name))

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

   const char* resource_name = env->GetStringUTFChars(name, NULL);

   jintArray result = JVM_GetResourceLookupCache(env, loader, resource_name);

   env->ReleaseStringUTFChars(name, resource_name);

   return result;

 WB_END

 WB_ENTRY(void, WB_AddToBootstrapClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {

 #if INCLUDE_JVMTI

   ResourceMark rm;

   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));

   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);

   jvmtiError err = jvmti_env->AddToBootstrapClassLoaderSearch(seg);

   assert(err == JVMTI_ERROR_NONE, "must not fail");

 #endif

 }

 WB_END

 WB_ENTRY(void, WB_AddToSystemClassLoaderSearch(JNIEnv* env, jobject o, jstring segment)) {

 #if INCLUDE_JVMTI

   ResourceMark rm;

   const char* seg = java_lang_String::as_utf8_string(JNIHandles::resolve_non_null(segment));

   JvmtiEnv* jvmti_env = JvmtiEnv::create_a_jvmti(JVMTI_VERSION);

   jvmtiError err = jvmti_env->AddToSystemClassLoaderSearch(seg);

   assert(err == JVMTI_ERROR_NONE, "must not fail");

 #endif

 }

 WB_END

 #ifdef LINUX

 #include "utilities/elfFile.hpp"

 #include "osContainer_linux.hpp"

 #endif

 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 " Space alignment " SIZE_FORMAT " Heap 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

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

   oop p = JNIHandles::resolve(obj);

 #if INCLUDE_ALL_GCS

   if (UseG1GC) {

     G1CollectedHeap* g1 = G1CollectedHeap::heap();

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

     if (hr == NULL) {

       return false;

     }

     return !(hr->is_young());

   } else if (UseParallelGC) {

     ParallelScavengeHeap* psh = ParallelScavengeHeap::heap();

     return !psh->is_in_young(p);

   }

 #endif // INCLUDE_ALL_GCS

   GenCollectedHeap* gch = GenCollectedHeap::heap();

   return !gch->is_in_young(p);

 WB_END

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

   oop p = JNIHandles::resolve(obj);

   return p->size() * HeapWordSize;

 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_G1NumMaxRegions(JNIEnv* env, jobject o))

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   size_t nr = g1->max_regions();

   return (jlong)nr;

 WB_END

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

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   size_t nr = g1->num_free_regions();

   return (jlong)nr;

 WB_END

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

   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   return g1->concurrent_mark()->cmThread()->during_cycle();

 WB_END

 WB_ENTRY(jboolean, WB_G1StartMarkCycle(JNIEnv* env, jobject o))

   G1CollectedHeap* g1h = G1CollectedHeap::heap();

   if (!g1h->concurrent_mark()->cmThread()->during_cycle()) {

     g1h->collect(GCCause::_wb_conc_mark);

     return true;

   }

   return false;

 WB_END

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

   return (jint)HeapRegion::GrainBytes;

 WB_END

 WB_ENTRY(jobject, WB_G1AuxiliaryMemoryUsage(JNIEnv* env))

   ResourceMark rm(THREAD);

   G1CollectedHeap* g1h = G1CollectedHeap::heap();

   MemoryUsage usage = g1h->get_auxiliary_data_memory_usage();

   Handle h = MemoryService::create_MemoryUsage_obj(usage, CHECK_NULL);

   return JNIHandles::make_local(env, h());

 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;

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

   return addr;

 WB_END

 // Alloc memory with pseudo call stack. The test can create psudo malloc

 // allocation site to stress the malloc tracking.

 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStack(JNIEnv* env, jobject o, jlong size, jint pseudo_stack))

   address pc = (address)(size_t)pseudo_stack;

   NativeCallStack stack(&pc, 1);

   return (jlong)(uintptr_t)os::malloc(size, mtTest, stack);

 WB_END

 // Alloc memory with pseudo call stack and specific memory type.

 WB_ENTRY(jlong, WB_NMTMallocWithPseudoStackAndType(JNIEnv* env, jobject o, jlong size, jint pseudo_stack, jint type))

   address pc = (address)(size_t)pseudo_stack;

   NativeCallStack stack(&pc, 1);

   return (jlong)(uintptr_t)os::malloc(size, (MEMFLAGS)type, stack);

 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;

     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

 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))

   return MemTracker::tracking_level() == NMT_detail;

 WB_END

 WB_ENTRY(jboolean, WB_NMTChangeTrackingLevel(JNIEnv* env))

   // Test that we can downgrade NMT levels but not upgrade them.

   if (MemTracker::tracking_level() == NMT_off) {

     MemTracker::transition_to(NMT_off);

     return MemTracker::tracking_level() == NMT_off;

   } else {

     assert(MemTracker::tracking_level() == NMT_detail, "Should start out as detail tracking");

     MemTracker::transition_to(NMT_summary);

     assert(MemTracker::tracking_level() == NMT_summary, "Should be summary now");

     // Can't go to detail once NMT is set to summary.

     MemTracker::transition_to(NMT_detail);

     assert(MemTracker::tracking_level() == NMT_summary, "Should still be summary now");

     // Shutdown sets tracking level to minimal.

     MemTracker::shutdown();

     assert(MemTracker::tracking_level() == NMT_minimal, "Should be minimal now");

     // Once the tracking level is minimal, we cannot increase to summary.

     // The code ignores this request instead of asserting because if the malloc site

     // table overflows in another thread, it tries to change the code to summary.

     MemTracker::transition_to(NMT_summary);

     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");

     // Really can never go up to detail, verify that the code would never do this.

     MemTracker::transition_to(NMT_detail);

     assert(MemTracker::tracking_level() == NMT_minimal, "Should still be minimal now");

     return MemTracker::tracking_level() == NMT_minimal;

   }

 WB_END

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

   int hash_size = MallocSiteTable::hash_buckets();

   assert(hash_size > 0, "NMT hash_size should be > 0");

   return (jint)hash_size;

 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);

   int result = 0;

   CHECK_JNI_EXCEPTION_(env, result);

   MutexLockerEx mu(Compile_lock);

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

   if (is_osr) {

     result += mh->mark_osr_nmethods();

   } else if (mh->code() != NULL) {

     mh->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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   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);

   CHECK_JNI_EXCEPTION_(env, CompLevel_none);

   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);

   CHECK_JNI_EXCEPTION(env);

   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);

   CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);

   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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   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

 bool WhiteBox::compile_method(Method* method, int comp_level, int bci, Thread* THREAD) {

   // Screen for unavailable/bad comp level or null method

   AbstractCompiler* comp = CompileBroker::compiler(comp_level);

   if (method == NULL) {

     tty->print_cr("WB error: request to compile NULL method");

     return false;

   }

   if (comp_level > MIN2((CompLevel) TieredStopAtLevel, CompLevel_highest_tier)) {

     tty->print_cr("WB error: invalid compilation level %d", comp_level);

     return false;

   }

   if (comp == NULL) {

     tty->print_cr("WB error: no compiler for requested compilation level %d", comp_level);

     return false;

   }

   methodHandle mh(THREAD, method);

   // Compile method and check result

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

   MutexLocker mu(Compile_lock);

   bool is_queued = mh->queued_for_compilation();

   if (is_queued || nm != NULL) {

     return true;

   }

   tty->print("WB error: failed to compile at level %d method ", comp_level);

   mh->print_short_name(tty);

   tty->cr();

   if (is_queued) {

     tty->print_cr("WB error: blocking compilation is still in queue!");

   }

   return false;

 }

 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);

   CHECK_JNI_EXCEPTION_(env, JNI_FALSE);

   return WhiteBox::compile_method(Method::checked_resolve_jmethod_id(jmid), comp_level, bci, THREAD);

 WB_END

 WB_ENTRY(jboolean, WB_EnqueueInitializerForCompilation(JNIEnv* env, jobject o, jclass klass, jint comp_level))

   InstanceKlass* ik = InstanceKlass::cast(java_lang_Class::as_Klass(JNIHandles::resolve(klass)));

   Method* clinit = ik->class_initializer();

   if (clinit == NULL) {

     return false;

   }

   return WhiteBox::compile_method(clinit, comp_level, InvocationEntryBci, THREAD);

 WB_END

 class VM_WhiteBoxOperation : public VM_Operation {

  public:

   VM_WhiteBoxOperation()                         { }

   VMOp_Type type()                  const        { return VMOp_WhiteBoxOperation; }

   bool allow_nested_vm_operations() const        { return true; }

 };

 static AlwaysFalseClosure always_false;

 class VM_WhiteBoxCleanMethodData : public VM_WhiteBoxOperation {

  public:

   VM_WhiteBoxCleanMethodData(MethodData* mdo) : _mdo(mdo) { }

   void doit() {

     _mdo->clean_method_data(&always_false);

   }

  private:

   MethodData* _mdo;

 };

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

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

   CHECK_JNI_EXCEPTION(env);

   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);

     }

     VM_WhiteBoxCleanMethodData op(mdo);

     VMThread::execute(&op);

   }

   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);

     mh->set_prev_time(0);

 #endif

   }

 WB_END

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

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

   CHECK_JNI_EXCEPTION(env);

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

   MethodData* mdo = mh->method_data();

   if (mdo == NULL) {

     Method::build_interpreter_method_data(mh, CHECK_AND_CLEAR);

     mdo = mh->method_data();

   }

   mdo->init();

   InvocationCounter* icnt = mdo->invocation_counter();

   InvocationCounter* bcnt = mdo->backedge_counter();

   // set i-counter according to AdvancedThresholdPolicy::is_method_profiled

   // because SimpleThresholdPolicy::call_predicate_helper uses > in jdk8u, that's why we need to plus one.

   icnt->set(InvocationCounter::wait_for_compile, Tier4MinInvocationThreshold + 1);

   bcnt->set(InvocationCounter::wait_for_compile, Tier4CompileThreshold + 1);

 WB_END

 template <typename T>

 static bool GetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAt)(const char*, T*, bool, bool)) {

   if (name == NULL) {

     return false;

   }

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

   const char* flag_name = env->GetStringUTFChars(name, NULL);

   bool result = (*TAt)(flag_name, value, true, true);

   env->ReleaseStringUTFChars(name, flag_name);

   return result;

 }

 template <typename T>

 static bool SetVMFlag(JavaThread* thread, JNIEnv* env, jstring name, T* value, bool (*TAtPut)(const char*, T*, Flag::Flags)) {

   if (name == NULL) {

     return false;

   }

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

   const char* flag_name = env->GetStringUTFChars(name, NULL);

   bool result = (*TAtPut)(flag_name, value, Flag::INTERNAL);

   env->ReleaseStringUTFChars(name, flag_name);

   return result;

 }

 template <typename T>

 static jobject box(JavaThread* thread, JNIEnv* env, Symbol* name, Symbol* sig, T value) {

   ResourceMark rm(thread);

   jclass clazz = env->FindClass(name->as_C_string());

   CHECK_JNI_EXCEPTION_(env, NULL);

   jmethodID methodID = env->GetStaticMethodID(clazz,

         vmSymbols::valueOf_name()->as_C_string(),

         sig->as_C_string());

   CHECK_JNI_EXCEPTION_(env, NULL);

   jobject result = env->CallStaticObjectMethod(clazz, methodID, value);

   CHECK_JNI_EXCEPTION_(env, NULL);

   return result;

 }

 static jobject booleanBox(JavaThread* thread, JNIEnv* env, jboolean value) {

   return box(thread, env, vmSymbols::java_lang_Boolean(), vmSymbols::Boolean_valueOf_signature(), value);

 }

 static jobject integerBox(JavaThread* thread, JNIEnv* env, jint value) {

   return box(thread, env, vmSymbols::java_lang_Integer(), vmSymbols::Integer_valueOf_signature(), value);

 }

 static jobject longBox(JavaThread* thread, JNIEnv* env, jlong value) {

   return box(thread, env, vmSymbols::java_lang_Long(), vmSymbols::Long_valueOf_signature(), value);

 }

 /* static jobject floatBox(JavaThread* thread, JNIEnv* env, jfloat value) {

   return box(thread, env, vmSymbols::java_lang_Float(), vmSymbols::Float_valueOf_signature(), value);

 }*/

 static jobject doubleBox(JavaThread* thread, JNIEnv* env, jdouble value) {

   return box(thread, env, vmSymbols::java_lang_Double(), vmSymbols::Double_valueOf_signature(), value);

 }

 WB_ENTRY(jobject, WB_GetBooleanVMFlag(JNIEnv* env, jobject o, jstring name))

   bool result;

   if (GetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAt)) {

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

     return booleanBox(thread, env, result);

   }

   return NULL;

 WB_END

 WB_ENTRY(jobject, WB_GetIntxVMFlag(JNIEnv* env, jobject o, jstring name))

   intx result;

   if (GetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAt)) {

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

     return longBox(thread, env, result);

   }

   return NULL;

 WB_END

 WB_ENTRY(jobject, WB_GetUintxVMFlag(JNIEnv* env, jobject o, jstring name))

   uintx result;

   if (GetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAt)) {

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

     return longBox(thread, env, result);

   }

   return NULL;

 WB_END

 WB_ENTRY(jobject, WB_GetUint64VMFlag(JNIEnv* env, jobject o, jstring name))

   uint64_t result;

   if (GetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAt)) {

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

     return longBox(thread, env, result);

   }

   return NULL;

 WB_END

 WB_ENTRY(jobject, WB_GetDoubleVMFlag(JNIEnv* env, jobject o, jstring name))

   double result;

   if (GetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAt)) {

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

     return doubleBox(thread, env, result);

   }

   return NULL;

 WB_END

 WB_ENTRY(jstring, WB_GetStringVMFlag(JNIEnv* env, jobject o, jstring name))

   ccstr ccstrResult;

   if (GetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAt)) {

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

     jstring result = env->NewStringUTF(ccstrResult);

     CHECK_JNI_EXCEPTION_(env, NULL);

     return result;

   }

   return NULL;

 WB_END

 WB_ENTRY(void, WB_SetBooleanVMFlag(JNIEnv* env, jobject o, jstring name, jboolean value))

   bool result = value == JNI_TRUE ? true : false;

   SetVMFlag <bool> (thread, env, name, &result, &CommandLineFlags::boolAtPut);

 WB_END

 WB_ENTRY(void, WB_SetIntxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))

   intx result = value;

   SetVMFlag <intx> (thread, env, name, &result, &CommandLineFlags::intxAtPut);

 WB_END

 WB_ENTRY(void, WB_SetUintxVMFlag(JNIEnv* env, jobject o, jstring name, jlong value))

   uintx result = value;

   SetVMFlag <uintx> (thread, env, name, &result, &CommandLineFlags::uintxAtPut);

 WB_END

 WB_ENTRY(void, WB_SetUint64VMFlag(JNIEnv* env, jobject o, jstring name, jlong value))

   uint64_t result = value;

   SetVMFlag <uint64_t> (thread, env, name, &result, &CommandLineFlags::uint64_tAtPut);

 WB_END

 WB_ENTRY(void, WB_SetDoubleVMFlag(JNIEnv* env, jobject o, jstring name, jdouble value))

   double result = value;

   SetVMFlag <double> (thread, env, name, &result, &CommandLineFlags::doubleAtPut);

 WB_END

 WB_ENTRY(void, WB_SetStringVMFlag(JNIEnv* env, jobject o, jstring name, jstring value))

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

   const char* ccstrValue = (value == NULL) ? NULL : env->GetStringUTFChars(value, NULL);

   ccstr ccstrResult = ccstrValue;

   bool needFree;

   {

     ThreadInVMfromNative ttvfn(thread); // back to VM

     needFree = SetVMFlag <ccstr> (thread, env, name, &ccstrResult, &CommandLineFlags::ccstrAtPut);

   }

   if (value != NULL) {

     env->ReleaseStringUTFChars(value, ccstrValue);

   }

   if (needFree) {

     FREE_C_HEAP_ARRAY(char, ccstrResult, mtInternal);

   }

 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);

 #if INCLUDE_ALL_GCS

   if (UseG1GC) {

     // Needs to be cleared explicitly for G1

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

   }

 #endif // INCLUDE_ALL_GCS

 WB_END

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

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

 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

 WB_ENTRY(jstring, WB_GetCPUFeatures(JNIEnv* env, jobject o))

   const char* cpu_features = VM_Version::cpu_features();

   ThreadToNativeFromVM ttn(thread);

   jstring features_string = env->NewStringUTF(cpu_features);

   CHECK_JNI_EXCEPTION_(env, NULL);

   return features_string;

 WB_END

 int WhiteBox::get_blob_type(const CodeBlob* code) {

   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");

   return CodeBlobType::All;;

 }

 struct CodeBlobStub {

   CodeBlobStub(const CodeBlob* blob) :

       name(os::strdup(blob->name())),

       size(blob->size()),

       blob_type(WhiteBox::get_blob_type(blob)),

       address((jlong) blob) { }

   ~CodeBlobStub() { os::free((void*) name); }

   const char* const name;

   const jint        size;

   const jint        blob_type;

   const jlong       address;

 };

 static jobjectArray codeBlob2objectArray(JavaThread* thread, JNIEnv* env, CodeBlobStub* cb) {

   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());

   CHECK_JNI_EXCEPTION_(env, NULL);

   jobjectArray result = env->NewObjectArray(4, clazz, NULL);

   jstring name = env->NewStringUTF(cb->name);

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 0, name);

   jobject obj = integerBox(thread, env, cb->size);

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 1, obj);

   obj = integerBox(thread, env, cb->blob_type);

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 2, obj);

   obj = longBox(thread, env, cb->address);

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 3, obj);

   return result;

 }

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

   ResourceMark rm(THREAD);

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

   CHECK_JNI_EXCEPTION_(env, NULL);

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

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

   jobjectArray result = NULL;

   if (code == NULL) {

     return result;

   }

   int insts_size = code->insts_size();

   ThreadToNativeFromVM ttn(thread);

   jclass clazz = env->FindClass(vmSymbols::java_lang_Object()->as_C_string());

   CHECK_JNI_EXCEPTION_(env, NULL);

   result = env->NewObjectArray(3, clazz, NULL);

   if (result == NULL) {

     return result;

   }

   jobject level = integerBox(thread, env, code->comp_level());

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 0, level);

   jobject id = integerBox(thread, env, code->compile_id());

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetObjectArrayElement(result, 1, id);

   jbyteArray insts = env->NewByteArray(insts_size);

   CHECK_JNI_EXCEPTION_(env, NULL);

   env->SetByteArrayRegion(insts, 0, insts_size, (jbyte*) code->insts_begin());

   env->SetObjectArrayElement(result, 2, insts);

   return result;

 WB_END

 CodeBlob* WhiteBox::allocate_code_blob(int size, int blob_type) {

   guarantee(WhiteBoxAPI, "internal testing API :: WhiteBox has to be enabled");

   BufferBlob* blob;

   int full_size = CodeBlob::align_code_offset(sizeof(BufferBlob));

   if (full_size < size) {

     full_size += align_up(size - full_size, oopSize);

   }

   {

     MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);

     blob = (BufferBlob*) CodeCache::allocate(full_size);

     ::new (blob) BufferBlob("WB::DummyBlob", full_size);

   }

   // Track memory usage statistic after releasing CodeCache_lock

   MemoryService::track_code_cache_memory_usage();

   return blob;

 }

 WB_ENTRY(jlong, WB_AllocateCodeBlob(JNIEnv* env, jobject o, jint size, jint blob_type))

   if (size < 0) {

     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),

       err_msg("WB_AllocateCodeBlob: size is negative: " INT32_FORMAT, size));

   }

   return (jlong) WhiteBox::allocate_code_blob(size, blob_type);

 WB_END

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

   if (addr == 0) {

     return;

   }

   BufferBlob::free((BufferBlob*) addr);

 WB_END

 WB_ENTRY(jobjectArray, WB_GetCodeBlob(JNIEnv* env, jobject o, jlong addr))

   if (addr == 0) {

     THROW_MSG_NULL(vmSymbols::java_lang_NullPointerException(),

       "WB_GetCodeBlob: addr is null");

   }

   ThreadToNativeFromVM ttn(thread);

   CodeBlobStub stub((CodeBlob*) addr);

   return codeBlob2objectArray(thread, env, &stub);

 WB_END

 int WhiteBox::array_bytes_to_length(size_t bytes) {

   return Array<u1>::bytes_to_length(bytes);

 }

 WB_ENTRY(jlong, WB_AllocateMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong size))

   if (size < 0) {

     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),

         err_msg("WB_AllocateMetaspace: size is negative: " JLONG_FORMAT, size));

   }

   oop class_loader_oop = JNIHandles::resolve(class_loader);

   ClassLoaderData* cld = class_loader_oop != NULL

       ? java_lang_ClassLoader::loader_data(class_loader_oop)

       : ClassLoaderData::the_null_class_loader_data();

   void* metadata = MetadataFactory::new_writeable_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);

   return (jlong)(uintptr_t)metadata;

 WB_END

 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))

   oop class_loader_oop = JNIHandles::resolve(class_loader);

   ClassLoaderData* cld = class_loader_oop != NULL

       ? java_lang_ClassLoader::loader_data(class_loader_oop)

       : ClassLoaderData::the_null_class_loader_data();

   MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);

 WB_END

 WB_ENTRY(jlong, WB_IncMetaspaceCapacityUntilGC(JNIEnv* env, jobject wb, jlong inc))

   if (inc < 0) {

     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),

         err_msg("WB_IncMetaspaceCapacityUntilGC: inc is negative: " JLONG_FORMAT, inc));

   }

   jlong max_size_t = (jlong) ((size_t) -1);

   if (inc > max_size_t) {

     THROW_MSG_0(vmSymbols::java_lang_IllegalArgumentException(),

         err_msg("WB_IncMetaspaceCapacityUntilGC: inc does not fit in size_t: " JLONG_FORMAT, inc));

   }

   size_t new_cap_until_GC = 0;

   size_t aligned_inc = align_size_down((size_t) inc, Metaspace::commit_alignment());

   bool success = MetaspaceGC::inc_capacity_until_GC(aligned_inc, &new_cap_until_GC);

   if (!success) {

     THROW_MSG_0(vmSymbols::java_lang_IllegalStateException(),

                 "WB_IncMetaspaceCapacityUntilGC: could not increase capacity until GC "

                 "due to contention with another thread");

   }

   return (jlong) new_cap_until_GC;

 WB_END

 WB_ENTRY(jlong, WB_MetaspaceCapacityUntilGC(JNIEnv* env, jobject wb))

   return (jlong) MetaspaceGC::capacity_until_GC();

 WB_END

 WB_ENTRY(jboolean, WB_IsSharedClass(JNIEnv* env, jobject wb, jclass clazz))

   return (jboolean)MetaspaceShared::is_in_shared_space(java_lang_Class::as_Klass(JNIHandles::resolve_non_null(clazz)));

 WB_END

 WB_ENTRY(jboolean, WB_IsMonitorInflated(JNIEnv* env, jobject wb, jobject obj))

   oop obj_oop = JNIHandles::resolve(obj);

   return (jboolean) obj_oop->mark()->has_monitor();

 WB_END

 WB_ENTRY(void, WB_ForceSafepoint(JNIEnv* env, jobject wb))

   VM_ForceSafepoint force_safepoint_op;

   VMThread::execute(&force_safepoint_op);

 WB_END

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

     size_t alignment = Universe::heap()->collector_policy()->heap_alignment();

     return (jlong)alignment;

 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());

     vm_exit_during_initialization("Invalid layout of preloaded class: use -XX:+TraceClassLoading to see the origin of the problem 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;

 }

 void WhiteBox::register_methods(JNIEnv* env, jclass wbclass, JavaThread* thread, JNINativeMethod* method_array, int method_count) {

   ResourceMark rm;

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

   //  one by one registration natives for exception catching

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

   CHECK_JNI_EXCEPTION(env);

   for (int i = 0, n = method_count; i < n; ++i) {

     // Skip dummy entries

     if (method_array[i].fnPtr == NULL) continue;

     if (env->RegisterNatives(wbclass, &method_array[i], 1) != 0) {

       jthrowable throwable_obj = env->ExceptionOccurred();

       if (throwable_obj != NULL) {

         env->ExceptionClear();

         if (env->IsInstanceOf(throwable_obj, no_such_method_error_klass)) {

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

           // Ignoring the exception since it is not preventing use of other WhiteBox methods.

           tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s",

               method_array[i].name, method_array[i].signature);

         }

       } else {

         // Registration failed unexpectedly.

         tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered",

             method_array[i].name, method_array[i].signature);

         env->UnregisterNatives(wbclass);

         break;

       }

     }

   }

 }

 // Checks that the library libfile has the noexecstack bit set.

 WB_ENTRY(jboolean, WB_CheckLibSpecifiesNoexecstack(JNIEnv* env, jobject o, jstring libfile))

   jboolean ret = false;

 #ifdef LINUX

   // Can't be in VM when we call JNI.

   ThreadToNativeFromVM ttnfv(thread);

   const char* lf = env->GetStringUTFChars(libfile, NULL);

   CHECK_JNI_EXCEPTION_(env, 0);

   ElfFile ef(lf);

   ret = (jboolean) ef.specifies_noexecstack();

   env->ReleaseStringUTFChars(libfile, lf);

 #endif

   return ret;

 WB_END

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

   LINUX_ONLY(return OSContainer::is_containerized();)

   return false;

 WB_END

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

   os::print_os_info(tty);

 WB_END

 #define CC (char*)

 static JNINativeMethod methods[] = {

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

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

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

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

   {CC"getVMPageSize",      CC"()I",                   (void*)&WB_GetVMPageSize     },

   {CC"getVMLargePageSize", CC"()J",                   (void*)&WB_GetVMLargePageSize},

   {CC"getHeapAlignment",   CC"()J",                   (void*)&WB_GetHeapAlignment  },

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

   {CC"classKnownToNotExist",

                            CC"(Ljava/lang/ClassLoader;Ljava/lang/String;)Z",(void*)&WB_ClassKnownToNotExist},

   {CC"getLookupCacheURLs", CC"(Ljava/lang/ClassLoader;)[Ljava/net/URL;",    (void*)&WB_GetLookupCacheURLs},

   {CC"getLookupCacheMatches", CC"(Ljava/lang/ClassLoader;Ljava/lang/String;)[I",

                                                       (void*)&WB_GetLookupCacheMatches},

   {CC"parseCommandLine",

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

       (void*) &WB_ParseCommandLine

   },

   {CC"addToBootstrapClassLoaderSearch", CC"(Ljava/lang/String;)V",

                                                       (void*)&WB_AddToBootstrapClassLoaderSearch},

   {CC"addToSystemClassLoaderSearch",    CC"(Ljava/lang/String;)V",

                                                       (void*)&WB_AddToSystemClassLoaderSearch},

   {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},

   {CC"isSharedClass", CC"(Ljava/lang/Class;)Z",       (void*)&WB_IsSharedClass },

 #if INCLUDE_ALL_GCS

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

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

   {CC"g1NumMaxRegions",    CC"()J",                   (void*)&WB_G1NumMaxRegions  },

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

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

   {CC"g1StartConcMarkCycle",       CC"()Z",           (void*)&WB_G1StartMarkCycle  },

   {CC"g1AuxiliaryMemoryUsage", CC"()Ljava/lang/management/MemoryUsage;",

                                                       (void*)&WB_G1AuxiliaryMemoryUsage  },

 #endif // INCLUDE_ALL_GCS

 #if INCLUDE_NMT

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

   {CC"NMTMallocWithPseudoStack", CC"(JI)J",           (void*)&WB_NMTMallocWithPseudoStack},

   {CC"NMTMallocWithPseudoStackAndType", CC"(JII)J",   (void*)&WB_NMTMallocWithPseudoStackAndType},

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

   {CC"NMTChangeTrackingLevel", CC"()Z",               (void*)&WB_NMTChangeTrackingLevel},

   {CC"NMTGetHashSize",      CC"()I",                  (void*)&WB_NMTGetHashSize     },

 #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"enqueueMethodForCompilation0",

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

   {CC"enqueueInitializerForCompilation0",

       CC"(Ljava/lang/Class;I)Z",                      (void*)&WB_EnqueueInitializerForCompilation},

   {CC"clearMethodState",

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

   {CC"markMethodProfiled",

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

   {CC"setBooleanVMFlag",   CC"(Ljava/lang/String;Z)V",(void*)&WB_SetBooleanVMFlag},

   {CC"setIntxVMFlag",      CC"(Ljava/lang/String;J)V",(void*)&WB_SetIntxVMFlag},

   {CC"setUintxVMFlag",     CC"(Ljava/lang/String;J)V",(void*)&WB_SetUintxVMFlag},

   {CC"setUint64VMFlag",    CC"(Ljava/lang/String;J)V",(void*)&WB_SetUint64VMFlag},

   {CC"setDoubleVMFlag",    CC"(Ljava/lang/String;D)V",(void*)&WB_SetDoubleVMFlag},

   {CC"setStringVMFlag",    CC"(Ljava/lang/String;Ljava/lang/String;)V",

                                                       (void*)&WB_SetStringVMFlag},

   {CC"getBooleanVMFlag",   CC"(Ljava/lang/String;)Ljava/lang/Boolean;",

                                                       (void*)&WB_GetBooleanVMFlag},

   {CC"getIntxVMFlag",      CC"(Ljava/lang/String;)Ljava/lang/Long;",

                                                       (void*)&WB_GetIntxVMFlag},

   {CC"getUintxVMFlag",     CC"(Ljava/lang/String;)Ljava/lang/Long;",

                                                       (void*)&WB_GetUintxVMFlag},

   {CC"getUint64VMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Long;",

                                                       (void*)&WB_GetUint64VMFlag},

   {CC"getDoubleVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/Double;",

                                                       (void*)&WB_GetDoubleVMFlag},

   {CC"getStringVMFlag",    CC"(Ljava/lang/String;)Ljava/lang/String;",

                                                       (void*)&WB_GetStringVMFlag},

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

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

   {CC"youngGC",  CC"()V",                             (void*)&WB_YoungGC },

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

   {CC"allocateCodeBlob",   CC"(II)J",                 (void*)&WB_AllocateCodeBlob   },

   {CC"freeCodeBlob",       CC"(J)V",                  (void*)&WB_FreeCodeBlob       },

   {CC"getCodeBlob",        CC"(J)[Ljava/lang/Object;",(void*)&WB_GetCodeBlob        },

   {CC"allocateMetaspace",

      CC"(Ljava/lang/ClassLoader;J)J",                 (void*)&WB_AllocateMetaspace },

   {CC"freeMetaspace",

      CC"(Ljava/lang/ClassLoader;JJ)V",                (void*)&WB_FreeMetaspace },

   {CC"incMetaspaceCapacityUntilGC", CC"(J)J",         (void*)&WB_IncMetaspaceCapacityUntilGC },

   {CC"metaspaceCapacityUntilGC", CC"()J",             (void*)&WB_MetaspaceCapacityUntilGC },

   {CC"getCPUFeatures",     CC"()Ljava/lang/String;",  (void*)&WB_GetCPUFeatures     },

   {CC"getNMethod",         CC"(Ljava/lang/reflect/Executable;Z)[Ljava/lang/Object;",

                                                       (void*)&WB_GetNMethod         },

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

   {CC"forceSafepoint",     CC"()V",                   (void*)&WB_ForceSafepoint     },

   {CC"checkLibSpecifiesNoexecstack", CC"(Ljava/lang/String;)Z",

                                                       (void*)&WB_CheckLibSpecifiesNoexecstack},

   {CC"isContainerized",           CC"()Z",            (void*)&WB_IsContainerized },

   {CC"printOsInfo",               CC"()V",            (void*)&WB_PrintOsInfo },

 };

 #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()) {

         WhiteBox::register_methods(env, wbclass, thread, methods, sizeof(methods) / sizeof(methods[0]));

         WhiteBox::register_extended(env, wbclass, thread);

         WhiteBox::set_used();

       }

     }

   }

 JVM_END