148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
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* Copyright (c) 2003, 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 <stdio.h>
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#include <string.h>
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#include "jvmti.h"
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#include "agent_common.h"
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#include "JVMTITools.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef JNI_ENV_ARG
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#ifdef __cplusplus
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#define JNI_ENV_ARG(x, y) y
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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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#define PASSED 0
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#define STATUS_FAILED 2
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static jvmtiEnv *jvmti = NULL;
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static jvmtiCapabilities caps;
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static jint result = PASSED;
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static jboolean printdump = JNI_FALSE;
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_redefclass026(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNICALL Agent_OnAttach_redefclass026(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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JNIEXPORT jint JNI_OnLoad_redefclass026(JavaVM *jvm, char *options, void *reserved) {
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return JNI_VERSION_1_8;
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}
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#endif
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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if (options != NULL && strcmp(options, "printdump") == 0) {
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printdump = JNI_TRUE;
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}
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res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
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JVMTI_VERSION_1_1);
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if (res != JNI_OK || jvmti == NULL) {
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printf("Wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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err = (*jvmti)->AddCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(AddCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), err);
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return JNI_ERR;
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}
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err = (*jvmti)->GetCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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printf("(GetCapabilities) unexpected error: %s (%d)\n",
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TranslateError(err), 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("Warning: RedefineClasses is not implemented\n");
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}
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return JNI_OK;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass026_check(JNIEnv *env, jclass cls,
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jclass clazz, jbyteArray bytes) {
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jvmtiError err;
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jvmtiClassDefinition classDef;
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if (jvmti == NULL) {
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printf("JVMTI client was not properly loaded!\n");
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return STATUS_FAILED;
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}
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classDef.klass = clazz;
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classDef.class_byte_count =
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JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG(env, bytes));
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classDef.class_bytes = (unsigned char *)
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JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG(env, bytes), NULL);
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if (printdump == JNI_TRUE) {
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printf(">>> changed class name check ...\n");
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}
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err = (*jvmti)->RedefineClasses(jvmti, 1, &classDef);
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if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY &&
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!caps.can_redefine_classes) {
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/* It is OK */
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} else if (err != JVMTI_ERROR_NAMES_DONT_MATCH) {
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printf("Error expected: JVMTI_ERROR_NAMES_DONT_MATCH,\n");
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printf("\tactual: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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}
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if (printdump == JNI_TRUE) {
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printf(">>> ... done\n");
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}
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return result;
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}
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#ifdef __cplusplus
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}
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#endif
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