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5915
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1 /*
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26
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27 #include "jni.h"
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28
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29 #include "memory/universe.hpp"
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30 #include "oops/oop.inline.hpp"
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31 #include "prims/whitebox.hpp"
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32 #include "runtime/interfaceSupport.hpp"
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33 #include "runtime/os.hpp"
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34 #include "utilities/debug.hpp"
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35
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36 #ifndef SERIALGC
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37 #include "gc_implementation/g1/concurrentMark.hpp"
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38 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
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39 #include "gc_implementation/g1/heapRegionRemSet.hpp"
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40 #endif // !SERIALGC
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41
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42 bool WhiteBox::_used = false;
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43
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44 // Entry macro to transition from JNI to VM state.
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45
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46 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header)
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47 #define WB_END JNI_END
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48
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49 // Definitions of functions exposed via Whitebox API
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50
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51 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
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52 return (jlong)(void*)JNIHandles::resolve(obj);
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53 WB_END
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54
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55 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
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56 return heapOopSize;
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57 WB_END
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58
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59 #ifndef SERIALGC
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60 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
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61 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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62 oop result = JNIHandles::resolve(obj);
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63 const HeapRegion* hr = g1->heap_region_containing(result);
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64 return hr->isHumongous();
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65 WB_END
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66
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67 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
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68 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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69 size_t nr = g1->free_regions();
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70 return (jlong)nr;
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71 WB_END
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72
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73 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
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74 G1CollectedHeap* g1 = G1CollectedHeap::heap();
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75 ConcurrentMark* cm = g1->concurrent_mark();
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76 return cm->concurrent_marking_in_progress();
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77 WB_END
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78
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79 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
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80 return (jint)HeapRegion::GrainBytes;
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81 WB_END
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82 #endif // !SERIALGC
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83
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84 #define CC (char*)
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85
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86 static JNINativeMethod methods[] = {
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87 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
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88 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
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89 #ifndef SERIALGC
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90 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
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91 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous },
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92 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
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93 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },
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94 #endif // !SERIALGC
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95 };
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96
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97 #undef CC
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98
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99 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
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100 {
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101 if (WhiteBoxAPI) {
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102 // Make sure that wbclass is loaded by the null classloader
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103 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
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104 Handle loader(ikh->class_loader());
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105 if (loader.is_null()) {
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106 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
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107 jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));
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108 if (result == 0) {
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109 WhiteBox::set_used();
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110 }
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111 }
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112 }
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113 }
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114 JVM_END
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