| /* |
| * 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 |
| |
| /* line number matrix of original methods */ |
| static int orig_ln[METH_NUM][8] = { |
| {34, 0, 0, 0, 0, 0, 0, 0}, /* <init> */ |
| {40,41,43, 0, 0, 0, 0, 0}, /* checkIt */ |
| {55, 0, 0, 0, 0, 0, 0, 0}, /* finMethod */ |
| {48,50,51,50,52, 0, 0, 0} /* statMethod */ |
| }; |
| |
| /* line number matrix of redefined methods */ |
| static int redf_ln[METH_NUM][8] = { |
| {38,39,40,41,42,43,44,46}, /* <init> */ |
| {51,53,55, 0, 0, 0, 0, 0}, /* checkIt */ |
| {64,66,67,68,69,70,72, 0}, /* finMethod */ |
| {60, 0, 0, 0, 0, 0, 0, 0} /* statMethod */ |
| }; |
| |
| typedef struct { /* line numbers 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 lcount; /* line numbers quantity */ |
| jmethodID mid; /* JNI's method ID */ |
| } methInfo; |
| |
| /* list of original methods */ |
| static methInfo origMethInfo[] = { |
| {1, (char*) "<init>", (char*) "()V", 1, NULL}, |
| {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL}, |
| {1, (char*) "finMethod", (char*) "(CJIJ)V", 1, NULL}, |
| {0, (char*) "statMethod", (char*) "(III)D", 5, NULL} |
| }; |
| |
| /* list of redefined methods */ |
| static methInfo redefMethInfo[] = { |
| {1, (char*) "<init>", (char*) "()V", 8, NULL}, |
| {1, (char*) "checkIt", (char*) "(Ljava/io/PrintStream;Z)I", 3, NULL}, |
| {1, (char*) "finMethod", (char*) "(CJIJ)V", 7, NULL}, |
| {0, (char*) "statMethod", (char*) "(III)D", 1, NULL} |
| }; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jvmtiCapabilities caps; |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_redefclass010(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_redefclass010(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_redefclass010(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_get_line_numbers) { |
| printf("Warning: no access to line number info\n"); |
| } |
| |
| return JNI_OK; |
| } |
| |
| int checkAttr(JNIEnv *env, jclass redefCls, methInfo methodsInfo[], jint vrb) { |
| jvmtiError err; |
| int i, j, chkval = 0; |
| int totRes = PASSED; |
| jint count = -1; |
| jvmtiLineNumberEntry *ln_table; |
| |
| if (!caps.can_get_line_numbers) { |
| 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__, (vrb==2)?" original ":" ", methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| return STATUS_FAILED; |
| } |
| |
| /* get the LineNumberTable attribute */ |
| if ((err = ((*jvmti)->GetLineNumberTable(jvmti, methodsInfo[i].mid, |
| &count, &ln_table))) != JVMTI_ERROR_NONE) { |
| printf("%s: Failed to call GetLineNumberTable(): error=%d: %s\n", |
| __FILE__, err, TranslateError(err)); |
| printf("\tfor the%s%s method \"%s\", signature \"%s\"\n\n", |
| (vrb==2)?" original ":" ", methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign); |
| return STATUS_FAILED; |
| } else { |
| if (count != methodsInfo[i].lcount) { |
| printf("TEST %s %s method \"%s\", signature \"%s\":\ |
| found %d lines in the LineNumberTable, expected %d\n", |
| (vrb==2)?"BUG: original ":"FAILED:", |
| methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, |
| count, methodsInfo[i].lcount); |
| totRes = STATUS_FAILED; |
| continue; |
| } |
| else if (vrb == 1) |
| printf("\nChecking line numbers in the LineNumberTable of the %s method\ |
| \"%s\", signature \"%s\" ...\n\toverall number of lines: %d as expected\n", |
| methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, count); |
| |
| for (j=0; j<count; j++) { |
| if (vrb == 2) |
| chkval = orig_ln[i][j]; |
| else |
| chkval = redf_ln[i][j]; |
| |
| if (ln_table[j].line_number != chkval) { |
| printf("TEST %s %s method \"%s\", signature \"%s\": entry #%d\ |
| has value %d in the LineNumberTable, expected %d\n", |
| (vrb==2)?"BUG: original":"FAILED:", |
| methodsInfo[i].inst?"instance":"static", |
| methodsInfo[i].m_name, methodsInfo[i].m_sign, |
| j, ln_table[j].line_number, chkval); |
| totRes = STATUS_FAILED; |
| break; |
| } |
| else if (vrb == 1) |
| printf("\tentry #%d has value %d as expected\n", |
| j, ln_table[j].line_number); |
| } |
| } |
| } |
| return totRes; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass010_checkOrigAttr(JNIEnv *env, |
| jclass cls, jobject redefObj) { |
| jclass redefCls = |
| JNI_ENV_PTR(env)->GetObjectClass(JNI_ENV_ARG(env, redefObj)); |
| |
| return checkAttr(env, redefCls, origMethInfo, 2); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_RedefineClasses_redefclass010_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_redefclass010_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); |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
