1 /* 2 * Copyright (c) 2004, 2011, 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 typedef jintArray (JNICALL *GET_THREAD_STATE_VALUES_FN)(JNIEnv *, jint); 37 typedef jobjectArray (JNICALL *GET_THREAD_STATE_NAMES_FN)(JNIEnv *, jint, jintArray); 38 39 static GET_THREAD_STATE_VALUES_FN GetThreadStateValues_fp = NULL; 40 static GET_THREAD_STATE_NAMES_FN GetThreadStateNames_fp = NULL; 41 42 static void get_thread_state_info(JNIEnv *env, jint state, 43 jobjectArray stateValues, 44 jobjectArray stateNames) { 45 char errmsg[128]; 46 jintArray values; 47 jobjectArray names; 48 49 values = (*GetThreadStateValues_fp)(env, state); 50 if (values == NULL) { 51 sprintf(errmsg, "Mismatched VM version: Thread state (%d) " 52 "not supported", state); 53 JNU_ThrowInternalError(env, errmsg); 54 return; 55 } 56 /* state is also used as the index in the array */ 57 (*env)->SetObjectArrayElement(env, stateValues, state, values); 58 59 names = (*GetThreadStateNames_fp)(env, state, values); 60 if (names == NULL) { 61 sprintf(errmsg, "Mismatched VM version: Thread state (%d) " 62 "not supported", state); 63 JNU_ThrowInternalError(env, errmsg); 64 return; 65 } 66 (*env)->SetObjectArrayElement(env, stateNames, state, names); 67 } 68 69 JNIEXPORT void JNICALL 70 Java_sun_misc_VM_getThreadStateValues(JNIEnv *env, jclass cls, 71 jobjectArray values, 72 jobjectArray names) 73 { 74 char errmsg[128]; 75 76 // check if the number of Thread.State enum constants 77 // matches the number of states defined in jvm.h 78 jsize len1 = (*env)->GetArrayLength(env, values); 79 jsize len2 = (*env)->GetArrayLength(env, names); 80 if (len1 != JAVA_THREAD_STATE_COUNT || len2 != JAVA_THREAD_STATE_COUNT) { 81 sprintf(errmsg, "Mismatched VM version: JAVA_THREAD_STATE_COUNT = %d " 82 " but JDK expects %d / %d", 83 JAVA_THREAD_STATE_COUNT, len1, len2); 84 JNU_ThrowInternalError(env, errmsg); 85 return; 86 } 87 88 if (GetThreadStateValues_fp == NULL) { 89 GetThreadStateValues_fp = (GET_THREAD_STATE_VALUES_FN) 90 JDK_FindJvmEntry("JVM_GetThreadStateValues"); 91 if (GetThreadStateValues_fp == NULL) { 92 JNU_ThrowInternalError(env, 93 "Mismatched VM version: JVM_GetThreadStateValues not found"); 94 return; 95 } 96 97 GetThreadStateNames_fp = (GET_THREAD_STATE_NAMES_FN) 98 JDK_FindJvmEntry("JVM_GetThreadStateNames"); 99 if (GetThreadStateNames_fp == NULL) { 100 JNU_ThrowInternalError(env, 101 "Mismatched VM version: JVM_GetThreadStateNames not found"); 102 return ; 103 } 104 } 105 106 get_thread_state_info(env, JAVA_THREAD_STATE_NEW, values, names); 107 get_thread_state_info(env, JAVA_THREAD_STATE_RUNNABLE, values, names); 108 get_thread_state_info(env, JAVA_THREAD_STATE_BLOCKED, values, names); 109 get_thread_state_info(env, JAVA_THREAD_STATE_WAITING, values, names); 110 get_thread_state_info(env, JAVA_THREAD_STATE_TIMED_WAITING, values, names); 111 get_thread_state_info(env, JAVA_THREAD_STATE_TERMINATED, values, names); 112 } 113 114 JNIEXPORT jobject JNICALL 115 Java_sun_misc_VM_latestUserDefinedLoader(JNIEnv *env, jclass cls) { 116 return JVM_LatestUserDefinedLoader(env); 117 } 118 119 typedef void (JNICALL *GetJvmVersionInfo_fp)(JNIEnv*, jvm_version_info*, size_t); 120 121 JNIEXPORT void JNICALL 122 Java_sun_misc_VM_initialize(JNIEnv *env, jclass cls) { 123 GetJvmVersionInfo_fp func_p; 124 125 if (!JDK_InitJvmHandle()) { 126 JNU_ThrowInternalError(env, "Handle for JVM not found for symbol lookup"); 127 return; 128 } 129 130 func_p = (GetJvmVersionInfo_fp) JDK_FindJvmEntry("JVM_GetVersionInfo"); 131 if (func_p != NULL) { 132 jvm_version_info info; 133 134 memset(&info, 0, sizeof(info)); 135 136 /* obtain the JVM version info */ 137 (*func_p)(env, &info, sizeof(info)); 138 } 139 } 140