jdk8-mips64-public/hotspot: test/runtime/RedefineTests/libRedefineDoubleDelete.c@628176d22495 (annotated)

test/runtime/RedefineTests/libRedefineDoubleDelete.c@628176d22495 (annotated)

test/runtime/RedefineTests/libRedefineDoubleDelete.c

Thu, 12 Sep 2019 15:15:22 -0400

author: zgu
date: Thu, 12 Sep 2019 15:15:22 -0400
changeset 9748: 628176d22495
permissions: -rw-r--r--

8178870: instrumentation.retransformClasses cause coredump
Summary: Don't double-free cached class bytes on redefinition loading failure.
Reviewed-by: sspitsyn, jiangli

 /*
  * Copyright (c) 2017, 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 <stdio.h>
 #include <string.h>
 #include "jvmti.h"
 #ifdef __cplusplus
 extern "C" {
 #endif
 #ifndef JNI_ENV_ARG
 #ifdef __cplusplus
 #define JNI_ENV_ARG(x, y) y
 #define JNI_ENV_PTR(x) x
 #else
 #define JNI_ENV_ARG(x,y) x, y
 #define JNI_ENV_PTR(x) (*x)
 #endif
 #endif
 #define TranslateError(err) "JVMTI error"
 static jvmtiEnv *jvmti = NULL;
 static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
 JNIEXPORT
 jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
     return Agent_Initialize(jvm, options, reserved);
 }
 JNIEXPORT
 jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) {
     return Agent_Initialize(jvm, options, reserved);
 }
 JNIEXPORT
 jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
     return JNI_VERSION_1_8;
 }
 static jint newClassDataLen = 0;
 static unsigned char* newClassData = NULL;
 static jint
 getBytecodes(jvmtiEnv *jvmti_env,
              jint class_data_len, const unsigned char* class_data) {
     int i;
     jint res;
     newClassDataLen = class_data_len;
     res = (*jvmti_env)->Allocate(jvmti_env, newClassDataLen, &newClassData);
     if (res != JNI_OK) {
         printf("    Unable to allocate bytes\n");
         return JNI_ERR;
     }
     for (i = 0; i < newClassDataLen; i++) {
         newClassData[i] = class_data[i];
         // Rewrite oo in class to aa
         if (i > 0 && class_data[i] == 'o' && class_data[i-1] == 'o') {
             newClassData[i] = newClassData[i-1] = 'a';
         }
     }
     printf("  ... copied bytecode: %d bytes\n", (int)newClassDataLen);
     return JNI_OK;
 }
 static void JNICALL
 Callback_ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *env,
                            jclass class_being_redefined,
                            jobject loader, const char* name, jobject protection_domain,
                            jint class_data_len, const unsigned char* class_data,
                            jint *new_class_data_len, unsigned char** new_class_data) {
     if (name != NULL && strcmp(name, "RedefineDoubleDelete$B") == 0) {
         if (newClassData == NULL) {
             jint res = getBytecodes(jvmti_env, class_data_len, class_data);
             if (res == JNI_ERR) {
               printf(">>>    ClassFileLoadHook event: class name %s FAILED\n", name);
               return;
             }
             // Only change for first CFLH event.
             *new_class_data_len = newClassDataLen;
             *new_class_data = newClassData;
         }
         printf(">>>    ClassFileLoadHook event: class name %s\n", name);
     }
 }
 static
 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
     jint res, size;
     jvmtiCapabilities caps;
     jvmtiEventCallbacks callbacks;
     jvmtiError err;
     res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
         JVMTI_VERSION_1_2);
     if (res != JNI_OK || jvmti == NULL) {
         printf("    Error: wrong result of a valid call to GetEnv!\n");
         return JNI_ERR;
     }
     printf("Enabling following capabilities: can_generate_all_class_hook_events, "
            "can_retransform_classes, can_redefine_classes");
     memset(&caps, 0, sizeof(caps));
     caps.can_generate_all_class_hook_events = 1;
     caps.can_retransform_classes = 1;
     caps.can_redefine_classes = 1;
     printf("\n");
     err = (*jvmti)->AddCapabilities(jvmti, &caps);
     if (err != JVMTI_ERROR_NONE) {
         printf("    Error in AddCapabilites: %s (%d)\n", TranslateError(err), err);
         return JNI_ERR;
     }
     size = (jint)sizeof(callbacks);
     memset(&callbacks, 0, sizeof(callbacks));
     callbacks.ClassFileLoadHook = Callback_ClassFileLoadHook;
     err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, size);
     if (err != JVMTI_ERROR_NONE) {
         printf("    Error in SetEventCallbacks: %s (%d)\n", TranslateError(err), err);
         return JNI_ERR;
     }
     err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL);
     if (err != JVMTI_ERROR_NONE) {
         printf("    Error in SetEventNotificationMode: %s (%d)\n", TranslateError(err), err);
         return JNI_ERR;
     }
     return JNI_OK;
 }
 #ifdef __cplusplus
 }
 #endif

Mercurial > jdk8-mips64-public > hotspot / annotate

test/runtime/RedefineTests/libRedefineDoubleDelete.c@628176d22495 (annotated)

test/runtime/RedefineTests/libRedefineDoubleDelete.c