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

 /*

  * Copyright (c) 2012, 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/interfaceSupport.hpp"

 #include "runtime/os.hpp"

 #include "utilities/debug.hpp"

 #ifndef SERIALGC

 #include "gc_implementation/g1/concurrentMark.hpp"

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

 #include "gc_implementation/g1/heapRegionRemSet.hpp"

 #endif // !SERIALGC

 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

 #ifndef SERIALGC

 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 // !SERIALGC

 //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

   },

 #ifndef SERIALGC

   {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 // !SERIALGC

 };

 #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()) {

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

         jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));

         if (result == 0) {

           WhiteBox::set_used();

         }

       }

     }

   }

 JVM_END