268 lines
9.6 KiB
C++
268 lines
9.6 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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extern "C" {
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#define METH_NUM 4 /* overall number of methods */
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#define STATUS_FAILED 2
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#define PASSED 0
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/* line number matrix of original methods */
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static int orig_ln[METH_NUM][8] = {
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{ 34, 0, 0, 0, 0, 0, 0, 0 }, /* <init> */
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{ 40,41,43, 0, 0, 0, 0, 0 }, /* checkIt */
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{ 55, 0, 0, 0, 0, 0, 0, 0 }, /* finMethod */
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{ 48,50,51,50,52, 0, 0, 0 } /* statMethod */
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};
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/* line number matrix of redefined methods */
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static int redf_ln[METH_NUM][8] = {
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{ 38,39,40,41,42,43,44,46 }, /* <init> */
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{ 51,53,55, 0, 0, 0, 0, 0 }, /* checkIt */
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{ 64,66,67,68,69,70,72, 0 }, /* finMethod */
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{ 60, 0, 0, 0, 0, 0, 0, 0 } /* statMethod */
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};
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typedef struct { /* line numbers of a method */
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int inst; /* type of a method: 0- static; 1- instance */
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char *m_name; /* a method name */
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char *m_sign; /* JVM signature of a method */
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int lcount; /* line numbers quantity */
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jmethodID mid; /* JNI's method ID */
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} methInfo;
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/* list of original methods */
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static methInfo origMethInfo[] = {
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{ 1, (char*) "<init>", (char*) "()V", 1, NULL },
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{ 1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL },
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{ 1, (char*) "finMethod", (char*) "(CJIJ)V", 1, NULL },
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{ 0, (char*) "statMethod", (char*) "(III)D", 5, NULL }
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};
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/* list of redefined methods */
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static methInfo redefMethInfo[] = {
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{ 1, (char*) "<init>", (char*) "()V", 8, NULL },
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{ 1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL },
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{ 1, (char*) "finMethod", (char*) "(CJIJ)V", 7, NULL },
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{ 0, (char*) "statMethod", (char*) "(III)D", 1, NULL }
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};
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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_redefclass010(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_redefclass010(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_redefclass010(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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res = vm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
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if (res != 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(&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(&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(&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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if (!caps.can_get_line_numbers) {
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printf("Warning: no access to line number info\n");
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}
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return JNI_OK;
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}
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int checkAttr(JNIEnv *env, jclass redefCls, methInfo methodsInfo[], jint vrb) {
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jvmtiError err;
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int i, j, chkval = 0;
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int totRes = PASSED;
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jint count = -1;
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jvmtiLineNumberEntry *ln_table;
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if (!caps.can_get_line_numbers) {
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return PASSED;
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}
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for (i=0; i<METH_NUM; i++) {
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/* get the JNI method ID for a method with name m_name and
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signature m_sign */
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if (methodsInfo[i].inst) { /* an instance method */
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methodsInfo[i].mid = env->GetMethodID(redefCls,
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methodsInfo[i].m_name, methodsInfo[i].m_sign);
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} else { /* a static method */
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methodsInfo[i].mid = env->GetStaticMethodID(redefCls,
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methodsInfo[i].m_name, methodsInfo[i].m_sign);
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}
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if (methodsInfo[i].mid == NULL) {
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printf("%s: Failed to get the method ID for the%s%s method \"%s\", signature \"%s\"\n",
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__FILE__, (vrb == 2) ? " original " : " ",
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methodsInfo[i].inst ? "instance" : "static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign);
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return STATUS_FAILED;
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}
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/* get the LineNumberTable attribute */
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err = jvmti->GetLineNumberTable(methodsInfo[i].mid, &count, &ln_table);
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if (err != JVMTI_ERROR_NONE) {
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printf("%s: Failed to call GetLineNumberTable(): error=%d: %s\n",
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__FILE__, err, TranslateError(err));
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printf("\tfor the%s%s method \"%s\", signature \"%s\"\n\n",
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(vrb == 2) ? " original " : " ",
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methodsInfo[i].inst ? "instance" : "static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign);
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return STATUS_FAILED;
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} else {
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if (count != methodsInfo[i].lcount) {
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printf(
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"TEST %s %s method \"%s\", signature \"%s\": found %d lines in the LineNumberTable, expected %d\n",
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(vrb == 2) ? "BUG: original " : "FAILED:",
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methodsInfo[i].inst ? "instance" : "static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign,
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count, methodsInfo[i].lcount);
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totRes = STATUS_FAILED;
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continue;
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}
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else if (vrb == 1)
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printf(
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"\nChecking line numbers in the LineNumberTable of the %s method \"%s\", signature \"%s\" ...\n"
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"\toverall number of lines: %d as expected\n",
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methodsInfo[i].inst ? "instance" : "static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign, count);
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for (j=0; j<count; j++) {
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if (vrb == 2)
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chkval = orig_ln[i][j];
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else
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chkval = redf_ln[i][j];
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if (ln_table[j].line_number != chkval) {
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printf(
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"TEST %s %s method \"%s\", signature \"%s\": "
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"entry #%d has value %d in the LineNumberTable, expected %d\n",
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(vrb == 2) ? "BUG: original" : "FAILED:",
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methodsInfo[i].inst ? "instance" : "static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign,
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j, ln_table[j].line_number, chkval);
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totRes = STATUS_FAILED;
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break;
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}
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else if (vrb == 1)
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printf("\tentry #%d has value %d as expected\n",
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j, ln_table[j].line_number);
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}
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}
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}
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return totRes;
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass010_checkOrigAttr(JNIEnv *env,
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jclass cls, jobject redefObj) {
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jclass redefCls = env->GetObjectClass(redefObj);
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return checkAttr(env, redefCls, origMethInfo, 2);
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass010_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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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 = env->GetArrayLength(classBytes);
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classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(classBytes, NULL);
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if (vrb)
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printf("\n>>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n",
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classDef.class_byte_count);
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err = jvmti->RedefineClasses(1, &classDef);
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if (err != JVMTI_ERROR_NONE) {
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printf("%s: Failed to call RedefineClasses(): 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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return JNI_ERR;
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}
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if (vrb)
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printf("<<<<<<<< RedefineClasses() is successfully done\n\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_redefclass010_getResult(JNIEnv *env,
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jclass cls, jint vrb, jobject redefObj) {
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jclass redefCls = env->GetObjectClass(redefObj);
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return checkAttr(env, redefCls, redefMethInfo, vrb);
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}
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}
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