| /* |
| * 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 <string.h> |
| #include "jvmti.h" |
| #include "agent_common.h" |
| #include "jni_tools.h" |
| #include "jvmti_tools.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* ============================================================================= */ |
| |
| /* scaffold objects */ |
| static jlong timeout = 0; |
| |
| /* constant names */ |
| #define DEBUGEE_CLASS_NAME "nsk/jvmti/ClassFileLoadHook/classfloadhk008" |
| #define TESTED_CLASS_NAME "nsk/jvmti/ClassFileLoadHook/classfloadhk008r" |
| #define TESTED_CLASS_SIG "L"TESTED_CLASS_NAME";" |
| |
| #define BYTECODE_FIELD_SIG "[B" |
| #define REDEF_BYTECODE_FIELD_NAME "redefClassBytes" |
| #define NEW_BYTECODE_FIELD_NAME "newClassBytes" |
| |
| #define TESTED_CLASS_FIELD_NAME "testedClass" |
| #define TESTED_CLASS_FIELD_SIG "Ljava/lang/Class;" |
| |
| static jclass testedClass = NULL; |
| |
| static jint redefClassSize = 0; |
| static unsigned char* redefClassBytes = NULL; |
| |
| static jint newClassSize = 0; |
| static unsigned char* newClassBytes = NULL; |
| |
| static volatile int eventsCount = 0; |
| |
| /* ============================================================================= */ |
| |
| /** Get classfile bytecode from a static field of given class. */ |
| static int getBytecode(jvmtiEnv* jvmti, JNIEnv* jni, jclass cls, |
| const char fieldName[], const char fieldSig[], |
| jint* size, unsigned char* *bytes) { |
| |
| jfieldID fieldID = NULL; |
| jbyteArray array = NULL; |
| jbyte* elements; |
| int i; |
| |
| NSK_DISPLAY1("Find static field: %s\n", fieldName); |
| if (!NSK_JNI_VERIFY(jni, (fieldID = |
| NSK_CPP_STUB4(GetStaticFieldID, jni, cls, fieldName, fieldSig)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| NSK_DISPLAY1(" ... got fieldID: 0x%p\n", (void*)fieldID); |
| |
| NSK_DISPLAY1("Get classfile bytes array from static field: %s\n", fieldName); |
| if (!NSK_JNI_VERIFY(jni, (array = (jbyteArray) |
| NSK_CPP_STUB3(GetStaticObjectField, jni, cls, fieldID)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| NSK_DISPLAY1(" ... got array object: 0x%p\n", (void*)array); |
| |
| if (!NSK_JNI_VERIFY(jni, (*size = |
| NSK_CPP_STUB2(GetArrayLength, jni, array)) > 0)) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| NSK_DISPLAY1(" ... got array size: %d bytes\n", (int)*size); |
| |
| { |
| jboolean isCopy; |
| if (!NSK_JNI_VERIFY(jni, (elements = |
| NSK_CPP_STUB3(GetByteArrayElements, jni, array, |
| &isCopy)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| } |
| NSK_DISPLAY1(" ... got elements list: 0x%p\n", (void*)elements); |
| |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB3(Allocate, jvmti, *size, bytes))) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| NSK_DISPLAY1(" ... created bytes array: 0x%p\n", (void*)*bytes); |
| |
| for (i = 0; i < *size; i++) { |
| (*bytes)[i] = (unsigned char)elements[i]; |
| } |
| NSK_DISPLAY1(" ... copied bytecode: %d bytes\n", (int)*size); |
| |
| NSK_DISPLAY1("Release elements list: 0x%p\n", (void*)elements); |
| NSK_TRACE(NSK_CPP_STUB4(ReleaseByteArrayElements, jni, array, elements, JNI_ABORT)); |
| NSK_DISPLAY0(" ... released\n"); |
| |
| return NSK_TRUE; |
| } |
| |
| /** Get global reference to object from a static field of given class. */ |
| static jobject getObject(jvmtiEnv* jvmti, JNIEnv* jni, jclass cls, |
| const char fieldName[], const char fieldSig[]) { |
| |
| jfieldID fieldID = NULL; |
| jobject obj = NULL; |
| |
| NSK_DISPLAY1("Find static field: %s\n", fieldName); |
| if (!NSK_JNI_VERIFY(jni, (fieldID = |
| NSK_CPP_STUB4(GetStaticFieldID, jni, cls, fieldName, fieldSig)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NULL; |
| } |
| NSK_DISPLAY1(" ... got fieldID: 0x%p\n", (void*)fieldID); |
| |
| NSK_DISPLAY1("Get object from static field: %s\n", fieldName); |
| if (!NSK_JNI_VERIFY(jni, (obj = |
| NSK_CPP_STUB3(GetStaticObjectField, jni, cls, fieldID)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NULL; |
| } |
| NSK_DISPLAY1(" ... got object: 0x%p\n", (void*)obj); |
| |
| NSK_DISPLAY1("Make global reference to object: 0x%p\n", obj); |
| if (!NSK_JNI_VERIFY(jni, (obj = |
| NSK_CPP_STUB2(NewGlobalRef, jni, obj)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return NULL; |
| } |
| NSK_DISPLAY1(" ... got global ref: 0x%p\n", (void*)obj); |
| |
| return obj; |
| } |
| |
| /** Redefine given class with new bytecode. */ |
| static int redefineClass(jvmtiEnv* jvmti, jclass klass, const char className[], |
| jint size, unsigned char bytes[]) { |
| jvmtiClassDefinition classDef; |
| |
| classDef.klass = klass; |
| classDef.class_byte_count = size; |
| classDef.class_bytes = bytes; |
| |
| NSK_DISPLAY1("Redefine class: %s\n", className); |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB3(RedefineClasses, jvmti, 1, &classDef))) { |
| nsk_jvmti_setFailStatus(); |
| return NSK_FALSE; |
| } |
| NSK_DISPLAY1(" ... redefined with bytecode: %d bytes\n", (int)size); |
| |
| return NSK_TRUE; |
| } |
| |
| /* ============================================================================= */ |
| |
| /** Agent algorithm. */ |
| static void JNICALL |
| agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) { |
| NSK_DISPLAY0("Wait for debuggee to load original class\n"); |
| if (!NSK_VERIFY(nsk_jvmti_waitForSync(timeout))) |
| return; |
| |
| /* perform testing */ |
| { |
| { |
| jclass debugeeClass = NULL; |
| |
| NSK_DISPLAY0(">>> Obtain debuggee class\n"); |
| NSK_DISPLAY1("Find debugee class: %s\n", DEBUGEE_CLASS_NAME); |
| if (!NSK_JNI_VERIFY(jni, (debugeeClass = |
| NSK_CPP_STUB2(FindClass, jni, DEBUGEE_CLASS_NAME)) != NULL)) { |
| nsk_jvmti_setFailStatus(); |
| return; |
| } |
| NSK_DISPLAY1(" ... found class: 0x%p\n", (void*)debugeeClass); |
| |
| NSK_DISPLAY0(">>> Obtain tested class object\n"); |
| if (!NSK_VERIFY((testedClass = (jclass) |
| getObject(jvmti, jni, debugeeClass, TESTED_CLASS_FIELD_NAME, |
| TESTED_CLASS_FIELD_SIG)) != NULL)) |
| return; |
| |
| NSK_DISPLAY0(">>> Obtain redefined bytecode of tested class\n"); |
| if (!NSK_VERIFY(getBytecode(jvmti, jni, debugeeClass, |
| REDEF_BYTECODE_FIELD_NAME, |
| BYTECODE_FIELD_SIG, |
| &redefClassSize, &redefClassBytes))) |
| return; |
| |
| NSK_DISPLAY0(">>> Obtain new instrumented bytecode of tested class\n"); |
| if (!NSK_VERIFY(getBytecode(jvmti, jni, debugeeClass, |
| NEW_BYTECODE_FIELD_NAME, |
| BYTECODE_FIELD_SIG, |
| &newClassSize, &newClassBytes))) |
| return; |
| } |
| |
| NSK_DISPLAY0(">>> Redefine tested class\n"); |
| { |
| if (!NSK_VERIFY(redefineClass(jvmti, testedClass, TESTED_CLASS_NAME, |
| redefClassSize, redefClassBytes))) |
| return; |
| } |
| |
| NSK_DISPLAY0(">>> Testcase #1: Redefine class and check CLASS_FILE_LOAD_HOOK event\n"); |
| { |
| jvmtiEvent event = JVMTI_EVENT_CLASS_FILE_LOAD_HOOK; |
| |
| NSK_DISPLAY1("Enable event: %s\n", "CLASS_FILE_LOAD_HOOK"); |
| if (!NSK_VERIFY(nsk_jvmti_enableEvents(JVMTI_ENABLE, 1, &event, NULL))) |
| return; |
| NSK_DISPLAY0(" ... event enabled\n"); |
| |
| NSK_VERIFY(redefineClass(jvmti, testedClass, TESTED_CLASS_NAME, |
| redefClassSize, redefClassBytes)); |
| |
| NSK_DISPLAY1("Disable event: %s\n", "CLASS_FILE_LOAD_HOOK"); |
| if (NSK_VERIFY(nsk_jvmti_enableEvents(JVMTI_DISABLE, 1, &event, NULL))) { |
| NSK_DISPLAY0(" ... event disabled\n"); |
| } |
| |
| NSK_DISPLAY1("Check if event was received: %s\n", "CLASS_FILE_LOAD_HOOK"); |
| if (eventsCount != 1) { |
| NSK_COMPLAIN3("Unexpected number of %s events received for tested class:\n" |
| "# received: %d events\n" |
| "# expected: %d events\n", |
| "CLASS_FILE_LOAD_HOOK", eventsCount, 1); |
| nsk_jvmti_setFailStatus(); |
| } else { |
| NSK_DISPLAY1(" ... received: %d events\n", eventsCount); |
| } |
| } |
| |
| NSK_DISPLAY0(">>> Clean used data\n"); |
| { |
| NSK_DISPLAY1("Delete global reference to tested class object: 0x%p\n", (void*)testedClass); |
| NSK_CPP_STUB2(DeleteGlobalRef, jni, testedClass); |
| |
| NSK_DISPLAY1("Deallocate redefined bytecode array: 0x%p\n", (void*)redefClassBytes); |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB2(Deallocate, jvmti, redefClassBytes))) { |
| nsk_jvmti_setFailStatus(); |
| } |
| } |
| } |
| |
| NSK_DISPLAY0("Let debugee to finish\n"); |
| if (!NSK_VERIFY(nsk_jvmti_resumeSync())) |
| return; |
| } |
| |
| /* ============================================================================= */ |
| |
| /** Callback for CLASS_FILE_LOAD_HOOK event **/ |
| static void JNICALL |
| callbackClassFileLoadHook(jvmtiEnv *jvmti, JNIEnv *jni, |
| jclass class_being_redefined, |
| jobject loader, const char* name, jobject protection_domain, |
| jint class_data_len, const unsigned char* class_data, |
| jint *new_class_data_len, unsigned char** new_class_data) { |
| |
| NSK_DISPLAY5(" <CLASS_FILE_LOAD_HOOK>: name: %s, loader: 0x%p, redefined: 0x%p, bytecode: 0x%p:%d\n", |
| nsk_null_string(name), (void*)loader, (void*)class_being_redefined, |
| (void*)class_data, (int)class_data_len); |
| |
| if (name != NULL && (strcmp(name, TESTED_CLASS_NAME) == 0)) { |
| NSK_DISPLAY1("SUCCESS! CLASS_FILE_LOAD_HOOK for tested class: %s\n", TESTED_CLASS_NAME); |
| eventsCount++; |
| |
| NSK_DISPLAY2("Received redefined bytecode of redefined class: 0x%p:%d\n", |
| (void*)class_data, (int)class_data_len); |
| if (nsk_getVerboseMode()) { |
| nsk_printHexBytes(" ", 16, class_data_len, class_data); |
| } |
| |
| NSK_DISPLAY1("Check pointer to new_class_data_len: 0x%p\n", (void*)new_class_data_len); |
| if (new_class_data_len == NULL) { |
| NSK_COMPLAIN1("NULL new_class_data_len pointer passed to CLASS_FILE_LOAD_HOOK: 0x%p\n", |
| (void*)new_class_data_len); |
| nsk_jvmti_setFailStatus(); |
| } |
| |
| NSK_DISPLAY1("Check pointer to new_class_data: 0x%p\n", (void*)new_class_data); |
| if (new_class_data == NULL) { |
| NSK_COMPLAIN1("NULL new_class_data pointer passed to CLASS_FILE_LOAD_HOOK: 0x%p\n", |
| (void*)new_class_data); |
| nsk_jvmti_setFailStatus(); |
| } |
| |
| if (new_class_data_len != NULL && new_class_data != NULL) { |
| NSK_DISPLAY2("Replace with new instrumented bytecode: 0x%p:%d\n", |
| (void*)newClassBytes, (int)newClassSize); |
| if (nsk_getVerboseMode()) { |
| nsk_printHexBytes(" ", 16, newClassSize, newClassBytes); |
| } |
| |
| *new_class_data_len = newClassSize; |
| *new_class_data = newClassBytes; |
| } |
| } |
| } |
| |
| /* ============================================================================= */ |
| |
| /** Agent library initialization. */ |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_classfloadhk008(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_classfloadhk008(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_classfloadhk008(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jvmtiEnv* jvmti = NULL; |
| |
| /* init framework and parse options */ |
| if (!NSK_VERIFY(nsk_jvmti_parseOptions(options))) |
| return JNI_ERR; |
| |
| timeout = nsk_jvmti_getWaitTime() * 60 * 1000; |
| |
| /* create JVMTI environment */ |
| if (!NSK_VERIFY((jvmti = |
| nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL)) |
| return JNI_ERR; |
| |
| NSK_DISPLAY1("Add required capabilities: %s\n", "can_generate_eraly_class_hook_events, can_redefine_classes"); |
| { |
| jvmtiCapabilities caps; |
| |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_generate_all_class_hook_events = 1; |
| caps.can_redefine_classes = 1; |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB2(AddCapabilities, jvmti, &caps))) { |
| return JNI_ERR; |
| } |
| } |
| NSK_DISPLAY0(" ... added\n"); |
| |
| NSK_DISPLAY1("Set callback for event: %s\n", "CLASS_FILE_LOAD_HOOK"); |
| { |
| jvmtiEventCallbacks callbacks; |
| jint size = (jint)sizeof(callbacks); |
| |
| memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.ClassFileLoadHook = callbackClassFileLoadHook; |
| if (!NSK_JVMTI_VERIFY( |
| NSK_CPP_STUB3(SetEventCallbacks, jvmti, &callbacks, size))) { |
| return JNI_ERR; |
| } |
| } |
| NSK_DISPLAY0(" ... set\n"); |
| |
| /* register agent proc and arg */ |
| if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL))) |
| return JNI_ERR; |
| |
| return JNI_OK; |
| } |
| |
| /* ============================================================================= */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
