1 /* 2 * Copyright (c) 2012, 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 */ 24 25 #include "precompiled.hpp" 26 27 #include "jni.h" 28 29 #include "memory/universe.hpp" 30 #include "oops/oop.inline.hpp" 31 #include "prims/whitebox.hpp" 32 #include "runtime/interfaceSupport.hpp" 33 #include "runtime/os.hpp" 34 #include "utilities/debug.hpp" 35 36 #ifndef SERIALGC 37 #include "gc_implementation/g1/concurrentMark.hpp" 38 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 39 #include "gc_implementation/g1/heapRegionRemSet.hpp" 40 #endif // !SERIALGC 41 42 bool WhiteBox::_used = false; 43 44 // Entry macro to transition from JNI to VM state. 45 46 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header) 47 #define WB_END JNI_END 48 49 // Definitions of functions exposed via Whitebox API 50 51 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj)) 52 return (jlong)(void*)JNIHandles::resolve(obj); 53 WB_END 54 55 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o)) 56 return heapOopSize; 57 WB_END 58 59 #ifndef SERIALGC 60 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj)) 61 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 62 oop result = JNIHandles::resolve(obj); 63 const HeapRegion* hr = g1->heap_region_containing(result); 64 return hr->isHumongous(); 65 WB_END 66 67 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o)) 68 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 69 size_t nr = g1->free_regions(); 70 return (jlong)nr; 71 WB_END 72 73 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o)) 74 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 75 ConcurrentMark* cm = g1->concurrent_mark(); 76 return cm->concurrent_marking_in_progress(); 77 WB_END 78 79 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o)) 80 return (jint)HeapRegion::GrainBytes; 81 WB_END 82 #endif // !SERIALGC 83 84 #define CC (char*) 85 86 static JNINativeMethod methods[] = { 87 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress }, 88 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize }, 89 #ifndef SERIALGC 90 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark}, 91 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous }, 92 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions }, 93 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize }, 94 #endif // !SERIALGC 95 }; 96 97 #undef CC 98 99 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass)) 100 { 101 if (WhiteBoxAPI) { 102 // Make sure that wbclass is loaded by the null classloader 103 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass()); 104 Handle loader(ikh->class_loader()); 105 if (loader.is_null()) { 106 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI 107 jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0])); 108 if (result == 0) { 109 WhiteBox::set_used(); 110 } 111 } 112 } 113 } 114 JVM_END