1 /* 2 * Copyright (c) 2004, 2015, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include <string.h> 27 28 #include "jni.h" 29 #include "jni_util.h" 30 #include "jlong.h" 31 #include "jvm.h" 32 #include "jdk_util.h" 33 34 #include "sun_misc_VM.h" 35 36 /* Only register the performance-critical methods */ 37 static JNINativeMethod methods[] = { 38 {"getNanoTimeAdjustment", "(J)J", (void *)&JVM_GetNanoTimeAdjustment} 39 }; 40 41 JNIEXPORT jobject JNICALL 42 Java_sun_misc_VM_latestUserDefinedLoader(JNIEnv *env, jclass cls) { 43 return JVM_LatestUserDefinedLoader(env); 44 } 45 46 typedef void (JNICALL *GetJvmVersionInfo_fp)(JNIEnv*, jvm_version_info*, size_t); 47 48 JNIEXPORT void JNICALL 49 Java_sun_misc_VM_initialize(JNIEnv *env, jclass cls) { 50 GetJvmVersionInfo_fp func_p; 51 52 if (!JDK_InitJvmHandle()) { 53 JNU_ThrowInternalError(env, "Handle for JVM not found for symbol lookup"); 54 return; 55 } 56 57 // Registers implementations of native methods described in methods[] 58 // above. 59 // In particular, registers JVM_GetNanoTimeAdjustment as the implementation 60 // of the native sun.misc.VM.getNanoTimeAdjustment - avoiding the cost of 61 // introducing a Java_sun_misc_VM_getNanoTimeAdjustment wrapper 62 (*env)->RegisterNatives(env, cls, 63 methods, sizeof(methods)/sizeof(methods[0])); 64 65 func_p = (GetJvmVersionInfo_fp) JDK_FindJvmEntry("JVM_GetVersionInfo"); 66 if (func_p != NULL) { 67 jvm_version_info info; 68 69 memset(&info, 0, sizeof(info)); 70 71 /* obtain the JVM version info */ 72 (*func_p)(env, &info, sizeof(info)); 73 } 74 } 75