308 lines
11 KiB
C
308 lines
11 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 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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typedef struct { /* local variable info */
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char *v_name; /* a variable name */
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char *v_sign; /* JVM type signature */
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} localVar;
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/* local variables of redefined methods */
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static localVar constr_lv[] = { /* constructor's local variables */
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{(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"},
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{(char*) "constr_i", (char*) "I"},
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{(char*) "constr_l", (char*) "J"},
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{(char*) "constr_d", (char*) "D"},
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{(char*) "constr_f", (char*) "F"},
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{(char*) "constr_c", (char*) "C"}
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};
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static localVar checkIt_lv[] = { /* checkIt()'s local variables */
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{(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"},
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{(char*) "out", (char*) "Ljava/io/PrintStream;"},
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{(char*) "DEBUG_MODE", (char*) "Z"}
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};
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static localVar finMeth_lv[] = { /* finMethod()'s local variables */
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{(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"},
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{(char*) "fin_c", (char*) "C"},
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{(char*) "fin_i", (char*) "J"},
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{(char*) "fin_j", (char*) "I"},
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{(char*) "fin_k", (char*) "J"},
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{(char*) "fin_l", (char*) "J"},
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{(char*) "fin_f", (char*) "F"}
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};
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static localVar statMeth_lv[] = { /* statMethod()'s local variables */
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{(char*) "stat_x", (char*) "I"},
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{(char*) "stat_y", (char*) "I"},
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{(char*) "stat_z", (char*) "I"},
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{(char*) "stat_j", (char*) "D"},
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{(char*) "stat_i", (char*) "I"}
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};
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typedef struct { /* local variables 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 vcount; /* overall number of local variables */
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localVar *vars;
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jmethodID mid; /* JNI's method ID */
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} methInfo;
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/* list of original methods with NULL pointers to localVar */
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static methInfo origMethInfo[] = {
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{1, (char*) "<init>", (char*) "()V", 1, NULL, NULL},
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{1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 4, NULL, NULL},
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{1, (char*) "finMethod", (char*) "(CJIJ)V", 5, NULL, NULL},
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{0, (char*) "statMethod", (char*) "(III)D", 3, NULL, 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", 6, constr_lv, NULL},
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{1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, checkIt_lv, NULL},
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{1, (char*) "finMethod", (char*) "(CJIJ)V", 7, finMeth_lv, NULL},
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{0, (char*) "statMethod", (char*) "(III)D", 5, statMeth_lv, 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_redefclass009(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_redefclass009(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_redefclass009(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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if (!caps.can_access_local_variables) {
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printf("Warning: Access to local variables is not implemented\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[],
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jint vrb, int full) {
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jvmtiError err;
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int i, j, k;
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int totRes = PASSED;
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jint count = -1;
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jvmtiLocalVariableEntry *lv_table;
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if (!caps.can_access_local_variables) {
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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 =
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JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, 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 =
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JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, redefCls),
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methodsInfo[i].m_name, methodsInfo[i].m_sign);
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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\
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\"%s\", signature \"%s\"\n",
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__FILE__, full?" ":" original ", 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 LocalVariableTable attribute */
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if ((err = ((*jvmti)->GetLocalVariableTable(jvmti, methodsInfo[i].mid,
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&count, &lv_table))) != JVMTI_ERROR_NONE) {
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printf("%s: Failed to call GetLocalVariableTable(): 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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full?" ":" original ", 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].vcount) {
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printf("TEST FAILED: %s%s method \"%s\", signature \"%s\":\
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found %d vars in the LocalVariableTable, expected %d\n",
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full?" ":" original ", methodsInfo[i].inst?"instance":"static",
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methodsInfo[i].m_name, methodsInfo[i].m_sign,
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count, methodsInfo[i].vcount);
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totRes = STATUS_FAILED;
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continue;
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}
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else if (vrb)
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printf("\nChecking vars in the LocalVariableTable of the %s method \"%s\",\
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signature \"%s\" ...\n\tfound %d local vars 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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if (full) {
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for (j=0; j<count; j++) {
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for (k=0; k<count; k++) {
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if (strcmp(lv_table[j].name, methodsInfo[i].vars[k].v_name) == 0) {
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if (strcmp(lv_table[j].signature, methodsInfo[i].vars[k].v_sign) != 0) {
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printf("TEST FAILED: %s method \"%s\", signature \"%s\": var \"%s\"\
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has signature \"%s\" in the LocalVariableTable, expected \"%s\"\n",
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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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lv_table[j].name, lv_table[j].signature,
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methodsInfo[i].vars[k].v_sign);
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totRes = STATUS_FAILED;
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break;
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}
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else if (vrb)
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printf("\tfound var \"%s\", signature \"%s\" as expected\n",
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lv_table[j].name, lv_table[j].signature);
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}
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}
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}
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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_redefclass009_checkOrigAttr(JNIEnv *env,
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jclass cls, 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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/* check only the number of local variables */
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return checkAttr(env, redefCls, origMethInfo, 0, 0);
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}
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JNIEXPORT jint JNICALL
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Java_nsk_jvmti_RedefineClasses_redefclass009_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 =
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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)
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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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if ((err = ((*jvmti)->RedefineClasses(jvmti, 1, &classDef))) != 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_redefclass009_getResult(JNIEnv *env,
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jclass cls, 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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return checkAttr(env, redefCls, redefMethInfo, vrb, 1);
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}
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#ifdef __cplusplus
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}
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#endif
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