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