| /* |
| * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| #include <jni.h> |
| #include <stdio.h> |
| |
| #include <string.h> |
| #include <jvmti.h> |
| |
| #define STATUS_FAILED 2 |
| #define STATUS_PASSED 0 |
| |
| #define REFERENCES_ARRAY_SIZE 10000000 |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) x |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x, y) x , y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #ifndef _Included_gc_g1_unloading_unloading_classloaders_JNIClassloader |
| #define _Included_gc_g1_unloading_unloading_classloaders_JNIClassloader |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* |
| * Class: gc_g1_unloading_unloading_classloaders_JNIClassloader |
| * Method: loadThroughJNI0 |
| * Signature: (Ljava/lang/String;Ljava/lang/ClassLoader;[B)Ljava/lang/Class; |
| */ |
| JNIEXPORT jclass JNICALL Java_gc_g1_unloading_classloaders_JNIClassloader_loadThroughJNI0 (JNIEnv * env, |
| jclass clazz, jstring className, jobject classLoader, jbyteArray bytecode) { |
| |
| const char * classNameChar = JNI_ENV_PTR(env)->GetStringUTFChars(JNI_ENV_ARG(env, className), NULL); |
| jbyte * arrayContent = JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG(env, bytecode), NULL); |
| jsize bytecodeLength = JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG(env, bytecode)); |
| jclass returnValue = JNI_ENV_PTR(env)->DefineClass(JNI_ENV_ARG(env, classNameChar), classLoader, arrayContent, bytecodeLength); |
| if (!returnValue) { |
| printf("ERROR: DefineClass call returned NULL by some reason. Classloading failed.\n"); |
| } |
| |
| return returnValue; |
| } |
| |
| /* |
| * Class: gc_g1_unloading_unloading_loading_ClassLoadingThread |
| * Method: makeRedefinition0 |
| * Signature: (ILjava/lang/Class;[B)I |
| */ |
| JNIEXPORT jint JNICALL Java_gc_g1_unloading_loading_ClassLoadingThread_makeRedefinition0(JNIEnv *env, |
| jclass cls, jint fl, jclass redefCls, jbyteArray classBytes) { |
| JavaVM * jvm; |
| jvmtiEnv * jvmti; |
| jvmtiError err; |
| jvmtiCapabilities caps; |
| jvmtiClassDefinition classDef; |
| jint jint_err = JNI_ENV_PTR(env)->GetJavaVM(JNI_ENV_ARG(env, &jvm)); |
| if (jint_err) { |
| printf("GetJavaVM returned nonzero: %d", jint_err); |
| return STATUS_FAILED; |
| } |
| |
| jint_err = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **)&jvmti), JVMTI_VERSION_1_0); |
| if (jint_err) { |
| printf("GetEnv returned nonzero: %d", jint_err); |
| return STATUS_FAILED; |
| } |
| |
| err = JNI_ENV_PTR(jvmti)->GetPotentialCapabilities(JNI_ENV_ARG(jvmti, &caps)); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetPotentialCapabilities) unexpected error: %d\n",err); |
| return JNI_ERR; |
| } |
| |
| err = JNI_ENV_PTR(jvmti)->AddCapabilities(JNI_ENV_ARG(jvmti, &caps)); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(AddCapabilities) unexpected error: %d\n", err); |
| return JNI_ERR; |
| } |
| |
| if (!caps.can_redefine_classes) { |
| printf("ERROR: Can't redefine classes. jvmtiCapabilities.can_redefine_classes isn't set up."); |
| return STATUS_FAILED; |
| } |
| |
| classDef.klass = redefCls; |
| classDef.class_byte_count = |
| JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG(env, classBytes)); |
| classDef.class_bytes = (unsigned char *) |
| JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG(env, classBytes), |
| NULL); |
| |
| if (fl == 2) { |
| printf(">>>>>>>> Invoke RedefineClasses():\n"); |
| printf("\tnew class byte count=%d\n", classDef.class_byte_count); |
| } |
| err = JNI_ENV_PTR(jvmti)->RedefineClasses(JNI_ENV_ARG(jvmti, 1), &classDef); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("%s: Failed to call RedefineClasses():\n", __FILE__); |
| printf("\tthe function returned error %d\n", err); |
| printf("\tFor more info about this error see the JVMTI spec.\n"); |
| return STATUS_FAILED; |
| } |
| if (fl == 2) |
| printf("<<<<<<<< RedefineClasses() is successfully done\n"); |
| |
| return STATUS_PASSED; |
| } |
| |
| jobject referencesArray[REFERENCES_ARRAY_SIZE]; |
| int firstFreeIndex = 0; |
| |
| /* |
| * Class: gc_g1_unloading_unloading_keepref_JNIGlobalRefHolder |
| * Method: keepGlobalJNIReference |
| * Signature: (Ljava/lang/Object;)I |
| */ |
| JNIEXPORT jint JNICALL Java_gc_g1_unloading_keepref_JNIGlobalRefHolder_keepGlobalJNIReference |
| (JNIEnv * env, jclass clazz, jobject obj) { |
| int returnValue; |
| referencesArray[firstFreeIndex] = JNI_ENV_PTR(env)->NewGlobalRef(JNI_ENV_ARG(env, obj)); |
| printf("checkpoint1 %d \n", firstFreeIndex); |
| returnValue = firstFreeIndex; |
| firstFreeIndex++; |
| return returnValue; |
| } |
| |
| /* |
| * Class: gc_g1_unloading_unloading_keepref_JNIGlobalRefHolder |
| * Method: deleteGlobalJNIReference |
| * Signature: (I)V |
| */ |
| JNIEXPORT void JNICALL Java_gc_g1_unloading_keepref_JNIGlobalRefHolder_deleteGlobalJNIReference |
| (JNIEnv * env, jclass clazz, jint index) { |
| JNI_ENV_PTR(env)->DeleteGlobalRef(JNI_ENV_ARG(env, referencesArray[index])); |
| } |
| |
| |
| /* |
| * Class: gc_g1_unloading_unloading_keepref_JNILocalRefHolder |
| * Method: holdWithJNILocalReference |
| * Signature: (Ljava/lang/Object;)V |
| */ |
| JNIEXPORT void JNICALL Java_gc_g1_unloading_keepref_JNILocalRefHolder_holdWithJNILocalReference |
| (JNIEnv * env, jobject thisObject, jobject syncObject) { |
| jclass clazz, objectClazz; |
| jfieldID objectToKeepField; |
| jobject objectToKeep, localRef; |
| jmethodID waitMethod; |
| |
| clazz = (*env)->GetObjectClass(env, thisObject); |
| objectToKeepField = (*env)->GetFieldID(env, clazz, "objectToKeep", "Ljava/lang/Object;"); |
| objectToKeep = (*env)->GetObjectField(env, thisObject, objectToKeepField); |
| localRef = (*env)->NewLocalRef(env, objectToKeep); |
| (*env)->SetObjectField(env, thisObject, objectToKeepField, NULL); |
| |
| objectClazz = (*env)->FindClass(env, "Ljava/lang/Object;"); |
| waitMethod = (*env)->GetMethodID(env, objectClazz, "wait", "()V"); |
| (*env)->CallVoidMethod(env, syncObject, waitMethod); |
| printf("checkpoint2 \n"); |
| } |
| |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif |