Quelle Classes.c Sprache: C

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* author Tomas Hurka
*        Ian Formanek
*        Misha Dmitriev
*/

#ifdef WIN32
#include <Windows.h>
#else
#include <sys/time.h>
#include <fcntl.h>
#include <time.h>
#endif

#ifdef SOLARIS
#define _STRUCTURED_PROC 1
#include <sys/procfs.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>

#include "jni.h"
#include "jvmti.h"

#include "org_netbeans_lib_profiler_server_system_Classes.h"

#include "common_functions.h"

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    getAllLoadedClasses
* Signature: ()[Ljava/lang/Class;
*/
JNIEXPORT jobjectArray JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_getAllLoadedClasses
    (JNIEnv *env, jclass clz)
{
    jvmtiError res;
    jint classCount, classStatus;
    jclass *classes;
    jobjectArray ret;
    jclass type;
    int i, j, n_linked_classes;
    char *class_status;

    res = (*_jvmti)->GetLoadedClasses(_jvmti, &classCount, &classes);
    assert(res == JVMTI_ERROR_NONE);

    n_linked_classes = 0;
    class_status = malloc(classCount);
    for (i = 0; i < classCount; i++) {
        (*_jvmti)->GetClassStatus(_jvmti, classes[i], &classStatus);
        if ((classStatus & JVMTI_CLASS_STATUS_PREPARED) != 0 && (classStatus & JVMTI_CLASS_STATUS_ERROR) == 0) {
            class_status[i] = 1;
            n_linked_classes++;
        } else {
            class_status[i] = 0;
        }
    }

    type = (*env)->FindClass(env, "java/lang/Class");
    assert(type != NULL);
    ret = (*env)->NewObjectArray(env, n_linked_classes, type, NULL);
    if (ret != NULL) {
        j = 0;
        for (i = 0; i < classCount; i++) {
            if (class_status[i]) {
                (*env)->SetObjectArrayElement(env, ret, j++, classes[i]);
            }
        }
    }
    free(class_status);
    res = (*_jvmti)->Deallocate(_jvmti, (unsigned char*) classes);
    assert(res == JVMTI_ERROR_NONE);

    return ret;
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    cacheLoadedClasses
* Signature: ([Ljava/lang/Class;I)V
*/
JNIEXPORT void JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_cacheLoadedClasses
  (JNIEnv *env, jclass clz, jobjectArray non_system_classes, jint class_count)
{
    jclass *classDefs = calloc(class_count,sizeof(jclass));
    int i;

    for (i = 0; i < class_count; i++) {
        classDefs[i] = (*env)->GetObjectArrayElement(env, non_system_classes, i);
    }
    cache_loaded_classes(_jvmti,classDefs,class_count);
    free(classDefs);
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    getCachedClassFileBytes
* Signature: (Ljava/lang/Class;)[B
*/
JNIEXPORT jbyteArray JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_getCachedClassFileBytes
    (JNIEnv *env, jclass clz, jclass clazz)
{
    char *class_sig, *class_gen_sig;
    jobject loader;
    unsigned char *class_data;
    int class_data_len;
    jbyteArray ret;
    jvmtiError res;

    res = (*_jvmti)->GetClassSignature(_jvmti, clazz, &class_sig, &class_gen_sig);
    assert(res == JVMTI_ERROR_NONE);
    res = (*_jvmti)->GetClassLoader(_jvmti, clazz, &loader);
    assert(res == JVMTI_ERROR_NONE);

    /* class_sig is gonna look something like Lfoo/Bar; Convert it back into normal */
    class_sig[strlen(class_sig) - 1] = 0;
    get_saved_class_file_bytes(env, class_sig+1, loader, (jint*)&class_data_len, &class_data);

    (*_jvmti)->Deallocate(_jvmti, (void*) class_sig);
    (*_jvmti)->Deallocate(_jvmti, (void*) class_gen_sig);

    if (class_data == NULL) {
        return NULL;
    }

    ret = (*env)->NewByteArray(env, class_data_len);
    (*env)->SetByteArrayRegion(env, ret, 0, class_data_len, (jbyte*) class_data);
    free(class_data);
    return ret;
}

static jclass profilerInterfaceClazz;
static jmethodID classLoadHookMethod = NULL;

void JNICALL register_class_prepare(jvmtiEnv *jvmti_env, JNIEnv* env, jthread thread, jclass clazz) {
    (*env)->CallStaticVoidMethod(env, profilerInterfaceClazz, classLoadHookMethod, clazz);
    if ((*env)->ExceptionCheck(env)) {
        (*env)->ExceptionDescribe(env);
    }
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    enableClassLoadHook
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_enableClassLoadHook
    (JNIEnv *env, jclass clz)
{
    jvmtiError res;

    if (classLoadHookMethod == NULL) {
        profilerInterfaceClazz = (*env)->FindClass(env, "org/netbeans/lib/profiler/server/ProfilerInterface");
        profilerInterfaceClazz = (*env)->NewGlobalRef(env, profilerInterfaceClazz);
        classLoadHookMethod = (*env)->GetStaticMethodID(env, profilerInterfaceClazz, "classLoadHook", "(Ljava/lang/Class;)V");
        _jvmti_callbacks->ClassPrepare = register_class_prepare;
        res = (*_jvmti)->SetEventCallbacks(_jvmti, _jvmti_callbacks, sizeof(*_jvmti_callbacks));
        assert (res == JVMTI_ERROR_NONE);
    }

    res = (*_jvmti)->SetEventNotificationMode(_jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, NULL);
    assert(res == JVMTI_ERROR_NONE);
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    disableClassLoadHook
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_disableClassLoadHook
    (JNIEnv *env, jclass clz)
{
    jvmtiError res;

    res = (*_jvmti)->SetEventNotificationMode(_jvmti, JVMTI_DISABLE, JVMTI_EVENT_CLASS_PREPARE, NULL);
    assert(res == JVMTI_ERROR_NONE);
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    getObjectSize
* Signature: (Ljava/lang/Object;)J
*/
JNIEXPORT jlong JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_getObjectSize
    (JNIEnv *env, jclass clz, jobject jobject)
{
    jlong res;

    (*_jvmti)->GetObjectSize(_jvmti, jobject, &res);
    return res;
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    doRedefineClasses
* Signature: ([Ljava/lang/Class;[[B)I
*/
JNIEXPORT jint JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_doRedefineClasses
    (JNIEnv *env, jclass clz, jobjectArray jclasses, jobjectArray jnewClassFileBytes)
{
    static jboolean nativeMethodBindDisabled = FALSE;

    jvmtiError res = JVMTI_ERROR_NONE;
    jint nClasses, i;
    jvmtiClassDefinition* classDefs;

    if (!nativeMethodBindDisabled) {
        // First, disable the NativeMethodBind event, assume that Thread.sleep and Object.wait have already been intercepted
        res = (*_jvmti)->SetEventNotificationMode(_jvmti, JVMTI_DISABLE, JVMTI_EVENT_NATIVE_METHOD_BIND, NULL);
        if (res != JVMTI_ERROR_NONE) {
            fprintf (stderr, "Profiler Agent Error: Error while turning NativeMethodBind off: %d\n",res);
            assert(res == JVMTI_ERROR_NONE);
        }
        nativeMethodBindDisabled = TRUE;
    }

    nClasses = (*env)->GetArrayLength(env, jclasses);
    classDefs = malloc(sizeof(jvmtiClassDefinition) * nClasses);
    for (i = 0; i < nClasses; i++) {
        jbyteArray jnewClassBytes;
        jbyte *tmpClassBytes;
        jint classBytesLen;

        jvmtiClassDefinition *classDef = classDefs + i;
        classDef->klass = (*env)->GetObjectArrayElement(env, jclasses, i);
        jnewClassBytes = (*env)->GetObjectArrayElement(env, jnewClassFileBytes, i);
        classBytesLen = classDef->class_byte_count = (*env)->GetArrayLength(env, jnewClassBytes);
        assert(classBytesLen > 0);

        tmpClassBytes = (*env)->GetByteArrayElements(env, jnewClassBytes, NULL);
        classDef->class_bytes = malloc(classBytesLen);
        memcpy((jbyte*) classDef->class_bytes, tmpClassBytes, classBytesLen);

        (*env)->ReleaseByteArrayElements(env, jnewClassBytes, tmpClassBytes, JNI_ABORT);
        (*env)->DeleteLocalRef(env, jnewClassBytes);
    }

    if (nClasses <= 100) {
        res = (*_jvmti)->RedefineClasses(_jvmti, nClasses, classDefs);
    } else {
        // perform batch redefine in units of 100 classes
        int idx = 0;
        while (idx < nClasses) {
            int redefineCount = nClasses - idx;
            if (redefineCount > 100) {
                redefineCount = 100;
            }
            fprintf (stdout, "Profiler Agent: Redefining %d classes at idx %d, out of total %d \n",redefineCount, idx, (int)nClasses);
            res = (*_jvmti)->RedefineClasses(_jvmti, redefineCount, classDefs + idx);
            idx += 100;
        }
    }

    for (i = 0; i < nClasses; i++) {
        (*env)->DeleteLocalRef(env, classDefs[i].klass);
        free((jbyte*) classDefs[i].class_bytes);
    }
    free(classDefs);

    return res;
}

/*
* Class:     org_netbeans_lib_profiler_server_system_Classes
* Method:    notifyAboutClassLoaderUnloading
* Signature: ()V
*/
JNIEXPORT void JNICALL Java_org_netbeans_lib_profiler_server_system_Classes_notifyAboutClassLoaderUnloading
  (JNIEnv *env, jclass clz)
{
    try_removing_bytes_for_unloaded_classes(env);
}

quality86%

¤ Dauer der Verarbeitung: 0.18 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.