jdk8-mips64-public/hotspot: src/share/vm/prims/whitebox.cpp@59c790074993 (annotated)

src/share/vm/prims/whitebox.cpp@59c790074993 (annotated)

src/share/vm/prims/whitebox.cpp

Wed, 28 Nov 2012 17:50:21 -0500

author: coleenp
date: Wed, 28 Nov 2012 17:50:21 -0500
changeset 4295: 59c790074993
parent 4037: da91efe96a93
child 4512: 4102b59539ce
child 4542: db9981fd3124
permissions: -rw-r--r--

8003635: NPG: AsynchGetCallTrace broken by Method* virtual call
Summary: Make metaspace::contains be lock free and used to see if something is in metaspace, also compare Method* with vtbl pointer.
Reviewed-by: dholmes, sspitsyn, dcubed, jmasa

 /*
  * 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

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/whitebox.cpp@59c790074993 (annotated)

src/share/vm/prims/whitebox.cpp