383 lines
14 KiB
C++
383 lines
14 KiB
C++
/*
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* Copyright (c) 2003, 2024, 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 <string.h>
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#include "jvmti.h"
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#include "agent_common.hpp"
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#include "jni_tools.hpp"
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#include "jvmti_tools.hpp"
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extern "C" {
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/* ============================================================================= */
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/* scaffold objects */
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static jlong timeout = 0;
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/* constant names */
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#define DEBUGEE_CLASS_NAME "nsk/jvmti/ClassFileLoadHook/classfloadhk008"
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#define TESTED_CLASS_NAME "nsk/jvmti/ClassFileLoadHook/classfloadhk008r"
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#define TESTED_CLASS_SIG "L" TESTED_CLASS_NAME ";"
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#define BYTECODE_FIELD_SIG "[B"
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#define REDEF_BYTECODE_FIELD_NAME "redefClassBytes"
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#define NEW_BYTECODE_FIELD_NAME "newClassBytes"
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#define TESTED_CLASS_FIELD_NAME "testedClass"
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#define TESTED_CLASS_FIELD_SIG "Ljava/lang/Class;"
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static jclass testedClass = nullptr;
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static jint redefClassSize = 0;
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static unsigned char* redefClassBytes = nullptr;
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static jint newClassSize = 0;
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static unsigned char* newClassBytes = nullptr;
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static volatile int eventsCount = 0;
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/* ============================================================================= */
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/** Get classfile bytecode from a static field of given class. */
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static int getBytecode(jvmtiEnv* jvmti, JNIEnv* jni, jclass cls,
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const char fieldName[], const char fieldSig[],
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jint* size, unsigned char* *bytes) {
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jfieldID fieldID = nullptr;
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jbyteArray array = nullptr;
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jbyte* elements;
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int i;
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NSK_DISPLAY1("Find static field: %s\n", fieldName);
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if (!NSK_JNI_VERIFY(jni, (fieldID =
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jni->GetStaticFieldID(cls, fieldName, fieldSig)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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NSK_DISPLAY1(" ... got fieldID: 0x%p\n", (void*)fieldID);
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NSK_DISPLAY1("Get classfile bytes array from static field: %s\n", fieldName);
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if (!NSK_JNI_VERIFY(jni, (array = (jbyteArray)
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jni->GetStaticObjectField(cls, fieldID)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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NSK_DISPLAY1(" ... got array object: 0x%p\n", (void*)array);
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if (!NSK_JNI_VERIFY(jni, (*size = jni->GetArrayLength(array)) > 0)) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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NSK_DISPLAY1(" ... got array size: %d bytes\n", (int)*size);
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{
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jboolean isCopy;
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if (!NSK_JNI_VERIFY(jni, (elements = jni->GetByteArrayElements(array, &isCopy)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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}
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NSK_DISPLAY1(" ... got elements list: 0x%p\n", (void*)elements);
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if (!NSK_JVMTI_VERIFY(jvmti->Allocate(*size, bytes))) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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NSK_DISPLAY1(" ... created bytes array: 0x%p\n", (void*)*bytes);
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for (i = 0; i < *size; i++) {
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(*bytes)[i] = (unsigned char)elements[i];
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}
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NSK_DISPLAY1(" ... copied bytecode: %d bytes\n", (int)*size);
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NSK_DISPLAY1("Release elements list: 0x%p\n", (void*)elements);
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NSK_TRACE(jni->ReleaseByteArrayElements(array, elements, JNI_ABORT));
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NSK_DISPLAY0(" ... released\n");
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return NSK_TRUE;
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}
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/** Get global reference to object from a static field of given class. */
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static jobject getObject(jvmtiEnv* jvmti, JNIEnv* jni, jclass cls,
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const char fieldName[], const char fieldSig[]) {
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jfieldID fieldID = nullptr;
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jobject obj = nullptr;
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NSK_DISPLAY1("Find static field: %s\n", fieldName);
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if (!NSK_JNI_VERIFY(jni, (fieldID =
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jni->GetStaticFieldID(cls, fieldName, fieldSig)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return nullptr;
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}
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NSK_DISPLAY1(" ... got fieldID: 0x%p\n", (void*)fieldID);
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NSK_DISPLAY1("Get object from static field: %s\n", fieldName);
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if (!NSK_JNI_VERIFY(jni, (obj = jni->GetStaticObjectField(cls, fieldID)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return nullptr;
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}
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NSK_DISPLAY1(" ... got object: 0x%p\n", (void*)obj);
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NSK_DISPLAY1("Make global reference to object: 0x%p\n", obj);
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if (!NSK_JNI_VERIFY(jni, (obj = jni->NewGlobalRef(obj)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return nullptr;
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}
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NSK_DISPLAY1(" ... got global ref: 0x%p\n", (void*)obj);
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return obj;
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}
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/** Redefine given class with new bytecode. */
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static int redefineClass(jvmtiEnv* jvmti, jclass klass, const char className[],
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jint size, unsigned char bytes[]) {
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jvmtiClassDefinition classDef;
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classDef.klass = klass;
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classDef.class_byte_count = size;
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classDef.class_bytes = bytes;
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NSK_DISPLAY1("Redefine class: %s\n", className);
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if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(1, &classDef))) {
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nsk_jvmti_setFailStatus();
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return NSK_FALSE;
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}
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NSK_DISPLAY1(" ... redefined with bytecode: %d bytes\n", (int)size);
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return NSK_TRUE;
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}
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/* ============================================================================= */
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/** Agent algorithm. */
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static void JNICALL
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agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
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NSK_DISPLAY0("Wait for debuggee to load original class\n");
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if (!NSK_VERIFY(nsk_jvmti_waitForSync(timeout)))
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return;
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/* perform testing */
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{
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{
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jclass debugeeClass = nullptr;
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NSK_DISPLAY0(">>> Obtain debuggee class\n");
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NSK_DISPLAY1("Find debugee class: %s\n", DEBUGEE_CLASS_NAME);
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if (!NSK_JNI_VERIFY(jni, (debugeeClass =
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jni->FindClass(DEBUGEE_CLASS_NAME)) != nullptr)) {
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nsk_jvmti_setFailStatus();
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return;
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}
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NSK_DISPLAY1(" ... found class: 0x%p\n", (void*)debugeeClass);
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NSK_DISPLAY0(">>> Obtain tested class object\n");
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if (!NSK_VERIFY((testedClass = (jclass)
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getObject(jvmti, jni, debugeeClass, TESTED_CLASS_FIELD_NAME,
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TESTED_CLASS_FIELD_SIG)) != nullptr))
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return;
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NSK_DISPLAY0(">>> Obtain redefined bytecode of tested class\n");
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if (!NSK_VERIFY(getBytecode(jvmti, jni, debugeeClass,
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REDEF_BYTECODE_FIELD_NAME,
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BYTECODE_FIELD_SIG,
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&redefClassSize, &redefClassBytes)))
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return;
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NSK_DISPLAY0(">>> Obtain new instrumented bytecode of tested class\n");
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if (!NSK_VERIFY(getBytecode(jvmti, jni, debugeeClass,
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NEW_BYTECODE_FIELD_NAME,
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BYTECODE_FIELD_SIG,
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&newClassSize, &newClassBytes)))
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return;
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}
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NSK_DISPLAY0(">>> Redefine tested class\n");
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{
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if (!NSK_VERIFY(redefineClass(jvmti, testedClass, TESTED_CLASS_NAME,
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redefClassSize, redefClassBytes)))
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return;
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}
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NSK_DISPLAY0(">>> Testcase #1: Redefine class and check CLASS_FILE_LOAD_HOOK event\n");
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{
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jvmtiEvent event = JVMTI_EVENT_CLASS_FILE_LOAD_HOOK;
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NSK_DISPLAY1("Enable event: %s\n", "CLASS_FILE_LOAD_HOOK");
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if (!NSK_VERIFY(nsk_jvmti_enableEvents(JVMTI_ENABLE, 1, &event, nullptr)))
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return;
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NSK_DISPLAY0(" ... event enabled\n");
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NSK_VERIFY(redefineClass(jvmti, testedClass, TESTED_CLASS_NAME,
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redefClassSize, redefClassBytes));
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NSK_DISPLAY1("Disable event: %s\n", "CLASS_FILE_LOAD_HOOK");
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if (NSK_VERIFY(nsk_jvmti_enableEvents(JVMTI_DISABLE, 1, &event, nullptr))) {
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NSK_DISPLAY0(" ... event disabled\n");
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}
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NSK_DISPLAY1("Check if event was received: %s\n", "CLASS_FILE_LOAD_HOOK");
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if (eventsCount != 1) {
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NSK_COMPLAIN3("Unexpected number of %s events received for tested class:\n"
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"# received: %d events\n"
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"# expected: %d events\n",
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"CLASS_FILE_LOAD_HOOK", eventsCount, 1);
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nsk_jvmti_setFailStatus();
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} else {
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NSK_DISPLAY1(" ... received: %d events\n", eventsCount);
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}
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}
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NSK_DISPLAY0(">>> Clean used data\n");
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{
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NSK_DISPLAY1("Delete global reference to tested class object: 0x%p\n", (void*)testedClass);
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jni->DeleteGlobalRef(testedClass);
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NSK_DISPLAY1("Deallocate redefined bytecode array: 0x%p\n", (void*)redefClassBytes);
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if (!NSK_JVMTI_VERIFY(jvmti->Deallocate(redefClassBytes))) {
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nsk_jvmti_setFailStatus();
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}
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}
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}
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NSK_DISPLAY0("Let debugee to finish\n");
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if (!NSK_VERIFY(nsk_jvmti_resumeSync()))
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return;
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}
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/* ============================================================================= */
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/** Callback for CLASS_FILE_LOAD_HOOK event **/
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static void JNICALL
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callbackClassFileLoadHook(jvmtiEnv *jvmti, JNIEnv *jni,
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jclass class_being_redefined,
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jobject loader, const char* name, jobject protection_domain,
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jint class_data_len, const unsigned char* class_data,
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jint *new_class_data_len, unsigned char** new_class_data) {
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NSK_DISPLAY5(" <CLASS_FILE_LOAD_HOOK>: name: %s, loader: 0x%p, redefined: 0x%p, bytecode: 0x%p:%d\n",
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nsk_null_string(name), (void*)loader, (void*)class_being_redefined,
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(void*)class_data, (int)class_data_len);
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if (name != nullptr && (strcmp(name, TESTED_CLASS_NAME) == 0)) {
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NSK_DISPLAY1("SUCCESS! CLASS_FILE_LOAD_HOOK for tested class: %s\n", TESTED_CLASS_NAME);
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eventsCount++;
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NSK_DISPLAY2("Received redefined bytecode of redefined class: 0x%p:%d\n",
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(void*)class_data, (int)class_data_len);
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if (nsk_getVerboseMode()) {
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nsk_printHexBytes(" ", 16, class_data_len, class_data);
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}
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NSK_DISPLAY1("Check pointer to new_class_data_len: 0x%p\n", (void*)new_class_data_len);
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if (new_class_data_len == nullptr) {
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NSK_COMPLAIN1("null new_class_data_len pointer passed to CLASS_FILE_LOAD_HOOK: 0x%p\n",
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(void*)new_class_data_len);
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nsk_jvmti_setFailStatus();
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}
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NSK_DISPLAY1("Check pointer to new_class_data: 0x%p\n", (void*)new_class_data);
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if (new_class_data == nullptr) {
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NSK_COMPLAIN1("null new_class_data pointer passed to CLASS_FILE_LOAD_HOOK: 0x%p\n",
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(void*)new_class_data);
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nsk_jvmti_setFailStatus();
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}
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if (new_class_data_len != nullptr && new_class_data != nullptr) {
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NSK_DISPLAY2("Replace with new instrumented bytecode: 0x%p:%d\n",
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(void*)newClassBytes, (int)newClassSize);
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if (nsk_getVerboseMode()) {
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nsk_printHexBytes(" ", 16, newClassSize, newClassBytes);
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}
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*new_class_data_len = newClassSize;
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*new_class_data = newClassBytes;
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}
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}
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}
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/* ============================================================================= */
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/** Agent library initialization. */
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#ifdef STATIC_BUILD
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JNIEXPORT jint JNICALL Agent_OnLoad_classfloadhk008(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_classfloadhk008(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_classfloadhk008(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 *jvm, char *options, void *reserved) {
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jvmtiEnv* jvmti = nullptr;
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/* init framework and parse options */
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if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
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return JNI_ERR;
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timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
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/* create JVMTI environment */
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if (!NSK_VERIFY((jvmti =
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nsk_jvmti_createJVMTIEnv(jvm, reserved)) != nullptr))
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return JNI_ERR;
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NSK_DISPLAY1("Add required capabilities: %s\n", "can_generate_eraly_class_hook_events, can_redefine_classes");
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{
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jvmtiCapabilities caps;
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_all_class_hook_events = 1;
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caps.can_redefine_classes = 1;
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if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
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return JNI_ERR;
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}
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}
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NSK_DISPLAY0(" ... added\n");
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NSK_DISPLAY1("Set callback for event: %s\n", "CLASS_FILE_LOAD_HOOK");
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{
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jvmtiEventCallbacks callbacks;
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jint size = (jint)sizeof(callbacks);
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.ClassFileLoadHook = callbackClassFileLoadHook;
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if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, size))) {
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return JNI_ERR;
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}
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}
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NSK_DISPLAY0(" ... set\n");
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/* register agent proc and arg */
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if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, nullptr)))
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return JNI_ERR;
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return JNI_OK;
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}
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/* ============================================================================= */
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}
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