222 lines
7.4 KiB
C
222 lines
7.4 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 "jni_tools.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 STATUS_FAILED 2
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#define PASSED 0
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#define NO_RESULTS 3
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/* expected values of new instance fields */
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static jint INTFLD = 333;
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static jlong LONGFLD = 444;
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#define STRFLD "completely new String field"
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static jvmtiEnv *jvmti = NULL;
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static jvmtiCapabilities caps;
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_redefclass004(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_redefclass004(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_redefclass004(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 *vm, char *options, void *reserved) {
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jint res;
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jvmtiError err;
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if ((res = JNI_ENV_PTR(vm)->GetEnv(JNI_ENV_ARG(vm, (void **) &jvmti),
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JVMTI_VERSION_1_1)) != JNI_OK) {
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printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res);
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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_redefclass004_makeRedefinition(JNIEnv *env,
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jclass cls, jint vrb, jclass redefCls, jbyteArray classBytes) {
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jvmtiError err;
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jvmtiClassDefinition classDef;
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int no_results = 0;
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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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if (!caps.can_redefine_classes) {
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return PASSED;
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}
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/* fill the structure jvmtiClassDefinition */
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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), NULL);
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if (vrb == 1)
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printf(">>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",
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classDef.class_byte_count);
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if ((err = ((*jvmti)->RedefineClasses(jvmti, 1, &classDef))) != JVMTI_ERROR_NONE) {
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if (err == JVMTI_ERROR_UNSUPPORTED_REDEFINITION_SCHEMA_CHANGED) {
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printf("Warning: unrestrictedly redefinition of classes is not implemented,\n\
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\tso the test has no results.\n");
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no_results = 1;
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}
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else {
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printf("%s: Failed to call RedefineClasses():\n\tthe function returned error %d: %s\n",
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__FILE__, err, TranslateError(err));
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printf("\tFor more info about this error see the JVMTI spec.\n");
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}
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if (no_results == 1) return NO_RESULTS;
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else return JNI_ERR;
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}
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if (vrb == 1)
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printf("<<<<<<<< RedefineClasses() is successfully done\n");
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return PASSED;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass004_checkNewFields(JNIEnv *env,
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jobject obj, jint vrb, jobject redefObj) {
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jclass redefCls =
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JNI_ENV_PTR(env)->GetObjectClass(JNI_ENV_ARG(env, redefObj));
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jfieldID fid;
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jint intFld;
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jlong longFld;
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jstring stringObj;
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const char *strFld = NULL;
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/* get value of new instance field "intComplNewFld" */
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if ((fid = JNI_ENV_PTR(env)->GetFieldID(JNI_ENV_ARG(env, redefCls),
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"intComplNewFld", "I")) == NULL) {
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printf("%s: Failed to get the field ID for the field \"intComplNewFld\"\n",
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__FILE__);
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return STATUS_FAILED;
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}
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intFld = JNI_ENV_PTR(env)->GetIntField(JNI_ENV_ARG(env, redefObj), fid);
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/* get value of new instance field "longComplNewFld" */
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if ((fid = JNI_ENV_PTR(env)->GetFieldID(JNI_ENV_ARG(env, redefCls),
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"longComplNewFld", "J")) == NULL) {
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printf("%s: Failed to get the field ID for the field \"longComplNewFld\"\n",
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__FILE__);
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return STATUS_FAILED;
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}
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longFld = JNI_ENV_PTR(env)->GetLongField(JNI_ENV_ARG(env, redefObj), fid);
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/* get value of new instance field "stringComplNewFld" */
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if ((fid = JNI_ENV_PTR(env)->GetFieldID(JNI_ENV_ARG(env, redefCls),
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"stringComplNewFld", "Ljava/lang/String;")) == NULL) {
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printf("%s: Failed to get the field ID for the field \"stringComplNewFld\"\n",
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__FILE__);
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return STATUS_FAILED;
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}
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stringObj = JNI_ENV_PTR(env)->GetObjectField(JNI_ENV_ARG(env,
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redefObj), fid);
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strFld = JNI_ENV_PTR(env)->GetStringUTFChars(JNI_ENV_ARG(env,
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stringObj), 0);
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if (intFld != INTFLD || longFld != LONGFLD ||
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strcmp(strFld, STRFLD) != 0) {
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printf("Completely new fields have not assigned their default values:\n");
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printf("\tintComplNewFld = %d,\texpected %d\n",
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intFld, INTFLD);
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printf("\tlongComplNewFld = %"LL"d", longFld);
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printf(",\texpected %"LL"d\n", LONGFLD);
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printf("\tstringComplNewFld = \"%s\",\texpected \"%s\"\n",
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strFld, STRFLD);
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JNI_ENV_PTR(env)->ReleaseStringUTFChars(JNI_ENV_ARG(env,
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stringObj), strFld);
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return STATUS_FAILED;
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} else {
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if (vrb == 1)
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printf("Completely new fields:\n\
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\tstringComplNewFld = \"%s\"\n\tintComplNewFld = %d\n\
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\tlongComplNewFld = %"LL"d\n",
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strFld, intFld, longFld);
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JNI_ENV_PTR(env)->ReleaseStringUTFChars(JNI_ENV_ARG(env,
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stringObj), strFld);
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return PASSED;
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}
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}
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#ifdef __cplusplus
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}
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#endif
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