JVMTI _jclass toString

Question

JVM TI _jclassの名前を取得する方法は？ JVMTIエージェントにロードされたクラスの名前を表示したいのですが、_jclassインスタンスからクラスの名前を取得する方法はわかりません。

Answer 1

これは必要なものですか？

#include <stdlib.h> 
#include "jvmti.h" 

jvmtiEnv *globalJVMTIInterface; 

void JNICALL vmInit(jvmtiEnv *jvmti_env,JNIEnv* jni_env,jthread thread) { 

    printf("VMStart\n"); 

    jint numberOfClasses; 
    jclass *classes; 

    jint returnCode = (*globalJVMTIInterface)->GetLoadedClasses(globalJVMTIInterface, &numberOfClasses, &classes); 
    if (returnCode != JVMTI_ERROR_NONE) { 
     fprintf(stderr, "Unable to get a list of loaded classes (%d)\n", returnCode); 
     exit(-1); 
    } 

    int i; 

    for(i=0;i<numberOfClasses;i++) { 

     char* signature = NULL; 
     char* generic = NULL; 

     (*globalJVMTIInterface)->GetClassSignature(globalJVMTIInterface, classes[i], &signature, &generic); 

     printf("%d) %s %s\n", i+1, signature, generic); 

     if(signature) { 
      returnCode = (*globalJVMTIInterface)->Deallocate(globalJVMTIInterface, (unsigned char*) signature); 
     } 
     if(generic) { 
      returnCode = (*globalJVMTIInterface)->Deallocate(globalJVMTIInterface, (unsigned char*) generic); 
     } 


    } 


    if(classes) { 
     returnCode = (*globalJVMTIInterface)->Deallocate(globalJVMTIInterface, (unsigned char*) classes); 
    } 

} 

JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) { 

    jint returnCode = (*jvm)->GetEnv(jvm, (void **)&globalJVMTIInterface, JVMTI_VERSION_1_0); 

    if (returnCode != JNI_OK) { 
      fprintf(stderr, "The version of JVMTI requested (1.0) is not supported by this JVM.\n"); 
      return JVMTI_ERROR_UNSUPPORTED_VERSION; 
    } 


    jvmtiEventCallbacks *eventCallbacks; 

    eventCallbacks = calloc(1, sizeof(jvmtiEventCallbacks)); 
    if (!eventCallbacks) { 
      fprintf(stderr, "Unable to allocate memory\n"); 
      return JVMTI_ERROR_OUT_OF_MEMORY; 
    } 


    eventCallbacks->VMInit = &vmInit; 


    returnCode = (*globalJVMTIInterface)->SetEventCallbacks(globalJVMTIInterface, eventCallbacks, (jint) sizeof(*eventCallbacks)); 
    if (returnCode != JNI_OK) { 
     fprintf(stderr, "JVM does not have the required capabilities (%d)\n", returnCode); 
     exit(-1); 
    } 


    returnCode = (*globalJVMTIInterface)->SetEventNotificationMode(globalJVMTIInterface, JVMTI_ENABLE, JVMTI_EVENT_VM_INIT, (jthread) NULL); 
    if (returnCode != JNI_OK) { 
     fprintf(stderr, "JVM does not have the required capabilities, JVMTI_ENABLE, JVMTI_EVENT_VM_INIT (%d)\n", returnCode); 
     exit(-1); 
    } 

    return JVMTI_ERROR_NONE; 
} 

Answer 2

私はあなたがGetClassSignature（それを試したわけではありません）から判断できると思います。