jdk8-mips64-public/hotspot: src/share/vm/prims/whitebox.cpp@b2e698d2276c

8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation
Summary: Enhance method resolution and resulting data structures, plus some refactoring.
Reviewed-by: twisti, acorn, jrose

     1 /*

     2  * Copyright (c) 2012, 2013, 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/universe.hpp"

    28 #include "oops/oop.inline.hpp"

    30 #include "classfile/symbolTable.hpp"

    31 #include "classfile/classLoaderData.hpp"

    33 #include "prims/whitebox.hpp"

    34 #include "prims/wbtestmethods/parserTests.hpp"

    36 #include "runtime/interfaceSupport.hpp"

    37 #include "runtime/os.hpp"

    38 #include "utilities/debug.hpp"

    39 #include "utilities/macros.hpp"

    40 #include "utilities/exceptions.hpp"

    42 #if INCLUDE_ALL_GCS

    43 #include "gc_implementation/g1/concurrentMark.hpp"

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

    45 #include "gc_implementation/g1/heapRegionRemSet.hpp"

    46 #endif // INCLUDE_ALL_GCS

    48 #ifdef INCLUDE_NMT

    49 #include "services/memTracker.hpp"

    50 #endif // INCLUDE_NMT

    52 #include "compiler/compileBroker.hpp"

    53 #include "runtime/compilationPolicy.hpp"

    55 bool WhiteBox::_used = false;

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

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

    59 WB_END

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

    62   return heapOopSize;

    63 WB_END

    66 class WBIsKlassAliveClosure : public KlassClosure {

    67     Symbol* _name;

    68     bool _found;

    69 public:

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

    72     void do_klass(Klass* k) {

    73       if (_found) return;

    74       Symbol* ksym = k->name();

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

    76         _found = true;

    77       }

    78     }

    80     bool found() const {

    81         return _found;

    82     }

    83 };

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

    86   Handle h_name = JNIHandles::resolve(name);

    87   if (h_name.is_null()) return false;

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

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

    91   WBIsKlassAliveClosure closure(sym);

    92   ClassLoaderDataGraph::classes_do(&closure);

    94   return closure.found();

    95 WB_END

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

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

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

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

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

   102     p->min_alignment(), p->max_alignment());

   103 }

   104 WB_END

   106 #if INCLUDE_ALL_GCS

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

   108   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   109   oop result = JNIHandles::resolve(obj);

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

   111   return hr->isHumongous();

   112 WB_END

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

   115   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   116   size_t nr = g1->free_regions();

   117   return (jlong)nr;

   118 WB_END

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

   121   G1CollectedHeap* g1 = G1CollectedHeap::heap();

   122   ConcurrentMark* cm = g1->concurrent_mark();

   123   return cm->concurrent_marking_in_progress();

   124 WB_END

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

   127   return (jint)HeapRegion::GrainBytes;

   128 WB_END

   129 #endif // INCLUDE_ALL_GCS

   131 #if INCLUDE_NMT

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

   133 // NMT picks it up correctly

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

   135   jlong addr = 0;

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

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

   139   }

   141   return addr;

   142 WB_END

   144 // Free the memory allocated by NMTAllocTest

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

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

   147 WB_END

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

   150   jlong addr = 0;

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

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

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

   155   }

   157   return addr;

   158 WB_END

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

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

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

   164 WB_END

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

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

   168 WB_END

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

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

   172 WB_END

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

   175 WB_ENTRY(jboolean, WB_NMTWaitForDataMerge(JNIEnv* env))

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

   178     return false;

   179   }

   181   return MemTracker::wbtest_wait_for_data_merge();

   182 WB_END

   184 WB_ENTRY(jboolean, WB_NMTIsDetailSupported(JNIEnv* env))

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

   186 WB_END

   188 #endif // INCLUDE_NMT

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

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

   192   ThreadToNativeFromVM ttn(thread);

   193   return env->FromReflectedMethod(method);

   194 }

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

   197   MutexLockerEx mu(Compile_lock);

   198   CodeCache::mark_all_nmethods_for_deoptimization();

   199   VM_Deoptimize op;

   200   VMThread::execute(&op);

   201 WB_END

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

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

   205   MutexLockerEx mu(Compile_lock);

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

   207   int result = 0;

   208   nmethod* code;

   209   if (is_osr) {

   210     int bci = InvocationEntryBci;

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

   212       code->mark_for_deoptimization();

   213       ++result;

   214       bci = code->osr_entry_bci() + 1;

   215     }

   216   } else {

   217     code = mh->code();

   218   }

   219   if (code != NULL) {

   220     code->mark_for_deoptimization();

   221     ++result;

   222   }

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

   224   if (result > 0) {

   225     VM_Deoptimize op;

   226     VMThread::execute(&op);

   227   }

   228   return result;

   229 WB_END

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

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

   233   MutexLockerEx mu(Compile_lock);

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

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

   236   if (code == NULL) {

   237     return JNI_FALSE;

   238   }

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

   240 WB_END

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

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

   244   MutexLockerEx mu(Compile_lock);

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

   246   if (is_osr) {

   247     return CompilationPolicy::can_be_osr_compiled(mh, comp_level);

   248   } else {

   249     return CompilationPolicy::can_be_compiled(mh, comp_level);

   250   }

   251 WB_END

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

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

   255   MutexLockerEx mu(Compile_lock);

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

   257   return mh->queued_for_compilation();

   258 WB_END

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

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

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

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

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

   265 WB_END

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

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

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

   270   if (is_osr) {

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

   272   } else {

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

   274   }

   275 WB_END

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

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

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

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

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

   282 WB_END

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

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

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

   287   bool result = mh->dont_inline();

   288   mh->set_dont_inline(value == JNI_TRUE);

   289   return result;

   290 WB_END

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

   293   if (comp_level == CompLevel_any) {

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

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

   296   } else {

   297     return CompileBroker::queue_size(comp_level);

   298   }

   299 WB_END

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

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

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

   304   bool result = mh->force_inline();

   305   mh->set_force_inline(value == JNI_TRUE);

   306   return result;

   307 WB_END

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

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

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

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

   313   MutexLockerEx mu(Compile_lock);

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

   315 WB_END

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

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

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

   320   MutexLockerEx mu(Compile_lock);

   321   MethodData* mdo = mh->method_data();

   322   MethodCounters* mcs = mh->method_counters();

   324   if (mdo != NULL) {

   325     mdo->init();

   326     ResourceMark rm;

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

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

   329       mdo->set_arg_modified(i, 0);

   330     }

   331   }

   333   mh->clear_not_c1_compilable();

   334   mh->clear_not_c2_compilable();

   335   mh->clear_not_c2_osr_compilable();

   336   NOT_PRODUCT(mh->set_compiled_invocation_count(0));

   337   if (mcs != NULL) {

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

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

   340     mcs->set_interpreter_invocation_count(0);

   341     mcs->set_interpreter_throwout_count(0);

   343 #ifdef TIERED

   344     mcs->set_rate(0.0F);

   345     mh->set_prev_event_count(0, THREAD);

   346     mh->set_prev_time(0, THREAD);

   347 #endif

   348   }

   349 WB_END

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

   352   ResourceMark rm(THREAD);

   353   int len;

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

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

   356 WB_END

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

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

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

   361 WB_END

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

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

   366   // (not be eliminated by the compiler)

   367   static char c;

   368   static volatile char* p;

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

   371   if (p == NULL) {

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

   373   }

   375   c = *p;

   376 WB_END

   378 //Some convenience methods to deal with objects from java

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

   380     Symbol* signature_symbol) {

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

   382   Thread* THREAD = Thread::current();

   384   //Get the class of our object

   385   Klass* arg_klass = object->klass();

   386   //Turn it into an instance-klass

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

   389   //Create symbols to look for in the class

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

   391       THREAD);

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

   394   fieldDescriptor fd;

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

   397   if (res == NULL) {

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

   399         name_symbol->as_C_string());

   400     fatal("Invalid layout of preloaded class");

   401   }

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

   404   int dest_offset = fd.offset();

   406   return dest_offset;

   407 }

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

   411   int offset = offset_for_field(field_name, object,

   412       vmSymbols::string_signature());

   413   oop string = object->obj_field(offset);

   414   if (string == NULL) {

   415     return NULL;

   416   }

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

   418   return ret;

   419 }

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

   422   int offset =

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

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

   425   return ret;

   426 }

   429 #define CC (char*)

   431 static JNINativeMethod methods[] = {

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

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

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

   435   {CC"parseCommandLine",

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

   437       (void*) &WB_ParseCommandLine

   438   },

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

   440 #if INCLUDE_ALL_GCS

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

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

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

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

   445 #endif // INCLUDE_ALL_GCS

   446 #if INCLUDE_NMT

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

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

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

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

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

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

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

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

   455 #endif // INCLUDE_NMT

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

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

   458                                                       (void*)&WB_DeoptimizeMethod  },

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

   460                                                       (void*)&WB_IsMethodCompiled  },

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

   462                                                       (void*)&WB_IsMethodCompilable},

   463   {CC"isMethodQueuedForCompilation",

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

   465   {CC"makeMethodNotCompilable",

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

   467   {CC"testSetDontInlineMethod",

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

   469   {CC"getMethodCompilationLevel",

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

   471   {CC"getMethodEntryBci",

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

   473   {CC"getCompileQueueSize",

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

   475   {CC"testSetForceInlineMethod",

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

   477   {CC"enqueueMethodForCompilation",

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

   479   {CC"clearMethodState",

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

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

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

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

   484 };

   486 #undef CC

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

   489   {

   490     if (WhiteBoxAPI) {

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

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

   493       Handle loader(ikh->class_loader());

   494       if (loader.is_null()) {

   495         ResourceMark rm;

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

   497         bool result = true;

   498         //  one by one registration natives for exception catching

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

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

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

   502             result = false;

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

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

   505               // ignoring the exception

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

   507               env->ExceptionClear();

   508             } else {

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

   510               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);

   511               env->UnregisterNatives(wbclass);

   512               break;

   513             }

   514           }

   515         }

   517         if (result) {

   518           WhiteBox::set_used();

   519         }

   520       }

   521     }

   522   }

   523 JVM_END

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

src/share/vm/prims/whitebox.cpp@b2e698d2276c

src/share/vm/prims/whitebox.cpp