| /* |
| * Copyright (c) 2003, 2018, 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> |
| #include "agent_common.h" |
| #include "JVMTITools.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 METH_NUM 4 /* overall number of methods */ |
| |
| #define STATUS_FAILED 2 |
| #define PASSED 0 |
| |
| typedef struct { /* local variable info */ |
| char *v_name; /* a variable name */ |
| char *v_sign; /* JVM type signature */ |
| } localVar; |
| |
| /* local variables of redefined methods */ |
| static localVar constr_lv[] = { /* constructor's local variables */ |
| {(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"}, |
| {(char*) "constr_i", (char*) "I"}, |
| {(char*) "constr_l", (char*) "J"}, |
| {(char*) "constr_d", (char*) "D"}, |
| {(char*) "constr_f", (char*) "F"}, |
| {(char*) "constr_c", (char*) "C"} |
| }; |
| static localVar checkIt_lv[] = { /* checkIt()'s local variables */ |
| {(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"}, |
| {(char*) "out", (char*) "Ljava/io/PrintStream;"}, |
| {(char*) "DEBUG_MODE", (char*) "Z"} |
| }; |
| static localVar finMeth_lv[] = { /* finMethod()'s local variables */ |
| {(char*) "this", (char*) "Lnsk/jvmti/RedefineClasses/redefclass009r;"}, |
| {(char*) "fin_c", (char*) "C"}, |
| {(char*) "fin_i", (char*) "J"}, |
| {(char*) "fin_j", (char*) "I"}, |
| {(char*) "fin_k", (char*) "J"}, |
| {(char*) "fin_l", (char*) "J"}, |
| {(char*) "fin_f", (char*) "F"} |
| }; |
| static localVar statMeth_lv[] = { /* statMethod()'s local variables */ |
| {(char*) "stat_x", (char*) "I"}, |
| {(char*) "stat_y", (char*) "I"}, |
| {(char*) "stat_z", (char*) "I"}, |
| {(char*) "stat_j", (char*) "D"}, |
| {(char*) "stat_i", (char*) "I"} |
| }; |
| |
| typedef struct { /* local variables of a method */ |
| int inst; /* type of a method: 0- static; 1- instance */ |
| char *m_name; /* a method name */ |
| char *m_sign; /* JVM signature of a method */ |
| int vcount; /* overall number of local variables */ |
| localVar *vars; |
| jmethodID mid; /* JNI's method ID */ |
| } methInfo; |
| |
| /* list of original methods with NULL pointers to localVar */ |
| static methInfo origMethInfo[] = { |
| {1, (char*) "<init>", (char*) "()V", 1, NULL, NULL}, |
| {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 4, NULL, NULL}, |
| {1, (char*) "finMethod", (char*) "(CJIJ)V", 5, NULL, NULL}, |
| {0, (char*) "statMethod", (char*) "(III)D", 3, NULL, NULL} |
| }; |
| |
| /* list of redefined methods */ |
| static methInfo redefMethInfo[] = { |
| {1, (char*) "<init>", (char*) "()V", 6, constr_lv, NULL}, |
| {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, checkIt_lv, NULL}, |
| {1, (char*) "finMethod", (char*) "(CJIJ)V", 7, finMeth_lv, NULL}, |
| {0, (char*) "statMethod", (char*) "(III)D", 5, statMeth_lv, NULL} |
| }; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jvmtiCapabilities caps; |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_redefclass009(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_redefclass009(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_redefclass009(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *vm, char *options, void *reserved) { |
| jint res; |
| jvmtiError err; |
| |
| if ((res = JNI_ENV_PTR(vm)->GetEnv(JNI_ENV_ARG(vm, (void **) &jvmti), |
| JVMTI_VERSION_1_1)) != JNI_OK) { |
| printf("%s: Failed to call GetEnv: error=%d\n", __FILE__, res); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(AddCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("(GetCapabilities) unexpected error: %s (%d)\n", |
| TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| if (!caps.can_redefine_classes) { |
| printf("Warning: RedefineClasses is not implemented\n"); |
| } |
| |
| if (!caps.can_access_local_variables) { |
| printf("Warning: Access to local variables is not implemented\n"); |
| } |
| |
| return JNI_OK; |
| } |
| |
| int checkAttr(JNIEnv *env, jclass redefCls, methInfo methodsInfo[], |
| jint vrb, int full) { |
| jvmtiError err; |
| int i, j, k; |
| int totRes = PASSED; |
| jint count = -1; |
| jvmtiLocalVariableEntry *lv_table; |
| |
| if (!caps.can_access_local_variables) { |
| return PASSED; |
| } |
| |
| for (i=0; i<METH_NUM; i++) { |
| /* get the JNI method ID for a method with name m_name and |
| signature m_sign */ |
| if (methodsInfo[i].inst) /* an instance method */ |
| methodsInfo[i].mid = |
| JNI_ENV_PTR(env)->GetMethodID(JNI_ENV_ARG(env, redefCls), |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| else /* a static method */ |
| methodsInfo[i].mid = |
| JNI_ENV_PTR(env)->GetStaticMethodID(JNI_ENV_ARG(env, redefCls), |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| if (methodsInfo[i].mid == NULL) { |
| printf("%s: Failed to get the method ID for the%s%s method\ |
| \"%s\", signature \"%s\"\n", |
| __FILE__, full?" ":" original ", methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| return STATUS_FAILED; |
| } |
| |
| /* get the LocalVariableTable attribute */ |
| if ((err = ((*jvmti)->GetLocalVariableTable(jvmti, methodsInfo[i].mid, |
| &count, &lv_table))) != JVMTI_ERROR_NONE) { |
| printf("%s: Failed to call GetLocalVariableTable(): error=%d: %s\n", |
| __FILE__, err, TranslateError(err)); |
| printf("\tfor the%s%s method \"%s\", signature \"%s\"\n\n", |
| full?" ":" original ", methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| return STATUS_FAILED; |
| } else { |
| if (count != methodsInfo[i].vcount) { |
| printf("TEST FAILED: %s%s method \"%s\", signature \"%s\":\ |
| found %d vars in the LocalVariableTable, expected %d\n", |
| full?" ":" original ", methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, |
| count, methodsInfo[i].vcount); |
| totRes = STATUS_FAILED; |
| continue; |
| } |
| else if (vrb) |
| printf("\nChecking vars in the LocalVariableTable of the %s method \"%s\",\ |
| signature \"%s\" ...\n\tfound %d local vars as expected\n", |
| methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, count); |
| |
| if (full) { |
| for (j=0; j<count; j++) { |
| for (k=0; k<count; k++) { |
| if (strcmp(lv_table[j].name, methodsInfo[i].vars[k].v_name) == 0) { |
| if (strcmp(lv_table[j].signature, methodsInfo[i].vars[k].v_sign) != 0) { |
| printf("TEST FAILED: %s method \"%s\", signature \"%s\": var \"%s\"\ |
| has signature \"%s\" in the LocalVariableTable, expected \"%s\"\n", |
| methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, |
| lv_table[j].name, lv_table[j].signature, |
| methodsInfo[i].vars[k].v_sign); |
| totRes = STATUS_FAILED; |
| break; |
| } |
| else if (vrb) |
| printf("\tfound var \"%s\", signature \"%s\" as expected\n", |
| lv_table[j].name, lv_table[j].signature); |
| } |
| } |
| } |
| } |
| } |
| } |
| return totRes; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass009_checkOrigAttr(JNIEnv *env, |
| jclass cls, jobject redefObj) { |
| jclass redefCls = |
| JNI_ENV_PTR(env)->GetObjectClass(JNI_ENV_ARG(env, redefObj)); |
| /* check only the number of local variables */ |
| return checkAttr(env, redefCls, origMethInfo, 0, 0); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass009_makeRedefinition(JNIEnv *env, |
| jclass cls, jint vrb, jclass redefCls, jbyteArray classBytes) { |
| jvmtiError err; |
| jvmtiClassDefinition classDef; |
| |
| if (jvmti == NULL) { |
| printf("JVMTI client was not properly loaded!\n"); |
| return STATUS_FAILED; |
| } |
| |
| if (!caps.can_redefine_classes) { |
| return PASSED; |
| } |
| |
| /* fill the structure jvmtiClassDefinition */ |
| classDef.klass = redefCls; |
| classDef.class_byte_count = |
| JNI_ENV_PTR(env)->GetArrayLength(JNI_ENV_ARG(env, classBytes)); |
| classDef.class_bytes = (unsigned char *) |
| JNI_ENV_PTR(env)->GetByteArrayElements(JNI_ENV_ARG(env, classBytes), NULL); |
| |
| if (vrb) |
| printf("\n>>>>>>>> Invoke RedefineClasses():\n\tnew class byte count=%d\n", |
| classDef.class_byte_count); |
| if ((err = ((*jvmti)->RedefineClasses(jvmti, 1, &classDef))) != JVMTI_ERROR_NONE) { |
| printf("%s: Failed to call RedefineClasses(): error=%d: %s\n", |
| __FILE__, err, TranslateError(err)); |
| printf("\tFor more info about this error see the JVMTI spec.\n"); |
| return JNI_ERR; |
| } |
| if (vrb) |
| printf("<<<<<<<< RedefineClasses() is successfully done\n\n"); |
| |
| return PASSED; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass009_getResult(JNIEnv *env, |
| jclass cls, jint vrb, jobject redefObj) { |
| jclass redefCls = |
| JNI_ENV_PTR(env)->GetObjectClass(JNI_ENV_ARG(env, redefObj)); |
| |
| return checkAttr(env, redefCls, redefMethInfo, vrb, 1); |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
