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 "memory/universe.hpp" 28 #include "oops/oop.inline.hpp" 29 30 #include "classfile/symbolTable.hpp" 31 32 #include "prims/whitebox.hpp" 33 #include "prims/wbtestmethods/parserTests.hpp" 34 35 #include "runtime/interfaceSupport.hpp" 36 #include "runtime/os.hpp" 37 #include "utilities/debug.hpp" 38 39 #ifndef SERIALGC 40 #include "gc_implementation/g1/concurrentMark.hpp" 41 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 42 #include "gc_implementation/g1/heapRegionRemSet.hpp" 43 #endif // !SERIALGC 44 45 bool WhiteBox::_used = false; 46 47 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj)) 48 return (jlong)(void*)JNIHandles::resolve(obj); 49 WB_END 50 51 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o)) 52 return heapOopSize; 53 WB_END 54 55 #ifndef SERIALGC 56 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj)) 57 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 58 oop result = JNIHandles::resolve(obj); 59 const HeapRegion* hr = g1->heap_region_containing(result); 60 return hr->isHumongous(); 61 WB_END 62 63 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o)) 64 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 65 size_t nr = g1->free_regions(); 66 return (jlong)nr; 67 WB_END 68 69 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o)) 70 G1CollectedHeap* g1 = G1CollectedHeap::heap(); 71 ConcurrentMark* cm = g1->concurrent_mark(); 72 return cm->concurrent_marking_in_progress(); 73 WB_END 74 75 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o)) 76 return (jint)HeapRegion::GrainBytes; 77 WB_END 78 #endif // !SERIALGC 79 80 //Some convenience methods to deal with objects from java 81 int WhiteBox::offset_for_field(const char* field_name, oop object, 82 Symbol* signature_symbol) { 83 assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid"); 84 Thread* THREAD = Thread::current(); 85 86 //Get the class of our object 87 klassOop arg_klass = object->klass(); 88 //Turn it into an instance-klass 89 instanceKlass* ik = instanceKlass::cast(arg_klass); 90 91 //Create symbols to look for in the class 92 TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name), 93 THREAD); 94 95 //To be filled in with an offset of the field we're looking for 96 fieldDescriptor fd; 97 98 klassOop res = ik->find_field(name_symbol, signature_symbol, &fd); 99 if (res == NULL) { 100 tty->print_cr("Invalid layout of %s at %s", ik->external_name(), 101 name_symbol->as_C_string()); 102 fatal("Invalid layout of preloaded class"); 103 } 104 105 //fetch the field at the offset we've found 106 int dest_offset = fd.offset(); 107 108 return dest_offset; 109 } 110 111 112 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) { 113 int offset = offset_for_field(field_name, object, 114 vmSymbols::string_signature()); 115 oop string = object->obj_field(offset); 116 if (oopDesc::is_null(string)) { 117 return NULL; 118 } 119 const char* ret = java_lang_String::as_utf8_string(string); 120 return ret; 121 } 122 123 bool WhiteBox::lookup_bool(const char* field_name, oop object) { 124 int offset = 125 offset_for_field(field_name, object, vmSymbols::bool_signature()); 126 bool ret = (object->bool_field(offset) == JNI_TRUE); 127 return ret; 128 } 129 130 131 #define CC (char*) 132 133 static JNINativeMethod methods[] = { 134 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress }, 135 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize }, 136 {CC "parseCommandLine", 137 CC "(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;", 138 (void*) &WB_ParseCommandLine 139 }, 140 #ifndef SERIALGC 141 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark}, 142 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous }, 143 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions }, 144 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize }, 145 #endif // !SERIALGC 146 }; 147 148 #undef CC 149 150 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass)) 151 { 152 if (WhiteBoxAPI) { 153 // Make sure that wbclass is loaded by the null classloader 154 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass()); 155 Handle loader(ikh->class_loader()); 156 if (loader.is_null()) { 157 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI 158 jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0])); 159 if (result == 0) { 160 WhiteBox::set_used(); 161 } 162 } 163 } 164 } 165 JVM_END