/*
* Copyright (c) 2003, 2021, 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 <inttypes.h>
#include "jvmti.h"
#include "agent_common.h"
#include "JVMTITools.h"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
#define EXP_STATUS (JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED)
typedef struct {
char *sig;
jint status;
jint mcount;
jint fcount;
jint icount;
} writable_class_info;
typedef struct {
const char *sig;
jint status;
jint mcount;
jint fcount;
jint icount;
} class_info;
static jvmtiEnv *jvmti = NULL;
static jvmtiEventCallbacks callbacks;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
static size_t eventsCount = 0;
static size_t eventsExpected = 0;
static class_info classes[] = {
{ "Lnsk/jvmti/ClassPrepare/classprep001$TestInterface;", EXP_STATUS, 2, 1, 0 },
{ "Lnsk/jvmti/ClassPrepare/classprep001$TestClass;", EXP_STATUS, 3, 2, 1 }
};
// These classes are loaded on a different thread.
// We should not get ClassPrepare events for them.
static const class_info unexpectedClasses[] = {
{ "Lnsk/jvmti/ClassPrepare/classprep001$TestInterface2;", 0, 0, 0, 0 },
{ "Lnsk/jvmti/ClassPrepare/classprep001$TestClass2;", 0, 0, 0, 0}
};
void printStatus(jint status) {
int flags = 0;
if ((status & JVMTI_CLASS_STATUS_VERIFIED) != 0) {
printf("JVMTI_CLASS_STATUS_VERIFIED");
flags++;
}
if ((status & JVMTI_CLASS_STATUS_PREPARED) != 0) {
if (flags > 0) printf(" | ");
printf("JVMTI_CLASS_STATUS_PREPARED");
flags++;
}
if ((status & JVMTI_CLASS_STATUS_INITIALIZED) != 0) {
if (flags > 0) printf(" | ");
printf("JVMTI_CLASS_STATUS_INITIALIZED");
flags++;
}
if ((status & JVMTI_CLASS_STATUS_ERROR) != 0) {
if (flags > 0) printf(" | ");
printf("JVMTI_CLASS_STATUS_ERROR");
flags++;
}
printf(" (0x%x)\n", status);
}
const size_t NOT_FOUND = (size_t)(-1);
size_t findClass(const char *classSig, const class_info *arr, int size) {
for (int i = 0; i < size; i++) {
if (strcmp(classSig, arr[i].sig) == 0) {
return i;
}
}
return NOT_FOUND;
}
void JNICALL ClassPrepare(jvmtiEnv *jvmti_env, JNIEnv *env,
jthread thr, jclass cls) {
jvmtiError err;
writable_class_info inf;
jmethodID *methods;
jfieldID *fields;
jclass *interfaces;
char *name, *sig, *generic;
int i;
err = jvmti_env->GetClassSignature(cls, &inf.sig, &generic);
if (err != JVMTI_ERROR_NONE) {
printf("(GetClassSignature#%" PRIuPTR ") unexpected error: %s (%d)\n",
eventsCount, TranslateError(err), err);
result = STATUS_FAILED;
return;
}
err = jvmti_env->GetClassStatus(cls, &inf.status);
if (err != JVMTI_ERROR_NONE) {
printf("(GetClassStatus#%" PRIuPTR ") unexpected error: %s (%d)\n",
eventsCount, TranslateError(err), err);
result = STATUS_FAILED;
}
err = jvmti_env->GetClassMethods(cls, &inf.mcount, &methods);
if (err != JVMTI_ERROR_NONE) {
printf("(GetClassMethods#%" PRIuPTR ") unexpected error: %s (%d)\n",
eventsCount, TranslateError(err), err);
result = STATUS_FAILED;
return;
}
err = jvmti_env->GetClassFields(cls, &inf.fcount, &fields);
if (err != JVMTI_ERROR_NONE) {
printf("(GetClassMethods#%" PRIuPTR ") unexpected error: %s (%d)\n",
eventsCount, TranslateError(err), err);
result = STATUS_FAILED;
return;
}
err = jvmti_env->GetImplementedInterfaces(cls,
&inf.icount, &interfaces);
if (err != JVMTI_ERROR_NONE) {
printf("(GetImplementedInterfaces#%" PRIuPTR ") unexpected error: %s (%d)\n",
eventsCount, TranslateError(err), err);
result = STATUS_FAILED;
return;
}
if (printdump == JNI_TRUE) {
printf(">>> [class prepare event #%" PRIuPTR "]", eventsCount);
printf(" \"%s\"\n", inf.sig);
printf(">>> status: ");
printStatus(inf.status);
printf(">>> %d methods:", inf.mcount);
for (i = 0; i < inf.mcount; i++) {
if (i > 0) printf(",");
if (methods[i] == NULL) {
printf(" null");
} else {
err = jvmti_env->GetMethodName(methods[i],
&name, &sig, &generic);
if (err == JVMTI_ERROR_NONE) {
printf(" \"%s%s\"", name, sig);
} else {
printf(" ???");
}
}
}
printf("\n");
printf(">>> %d fields:", inf.fcount);
for (i = 0; i < inf.fcount; i++) {
if (i > 0) printf(",");
if (fields[i] == NULL) {
printf(" null");
} else {
err = jvmti_env->GetFieldName(cls, fields[i],
&name, &sig, &generic);
if (err == JVMTI_ERROR_NONE) {
printf(" \"%s, %s\"", name, sig);
} else {
printf(" ???");
}
}
}
printf("\n");
printf(">>> %d interfaces:", inf.icount);
for (i = 0; i < inf.icount; i++) {
if (i > 0) printf(",");
if (interfaces[i] == NULL) {
printf(" null");
} else {
err = jvmti_env->GetClassSignature(
interfaces[i], &sig, &generic);
if (err == JVMTI_ERROR_NONE) {
printf(" \"%s\"", sig);
} else {
printf(" ???");
}
}
}
printf("\n");
}
size_t expectedClassIdx = findClass(inf.sig, classes, sizeof(classes)/sizeof(class_info));
// Test classes loading may cause system classes loading - skip them.
if (expectedClassIdx == NOT_FOUND) {
size_t unexpectedClassIdx = findClass(inf.sig, unexpectedClasses,
sizeof(unexpectedClasses)/sizeof(class_info));
if (unexpectedClassIdx != NOT_FOUND) {
printf("# wrong class: \"%s\"\n", inf.sig);
result = STATUS_FAILED;
}
return;
}
if (eventsCount != expectedClassIdx) {
printf("(#%" PRIuPTR ") unexpected order: %" PRIuPTR ", expected: %" PRIuPTR "\n",
eventsCount, expectedClassIdx, eventsCount);
result = STATUS_FAILED;
return;
}
if (inf.status != classes[eventsCount].status) {
printf("(#%" PRIuPTR ") wrong status: ", eventsCount);
printStatus(inf.status);
printf(" expected: ");
printStatus(classes[eventsCount].status);
result = STATUS_FAILED;
}
if (inf.mcount != classes[eventsCount].mcount) {
printf("(#%" PRIuPTR ") wrong number of methods: 0x%x",
eventsCount, inf.mcount);
printf(", expected: 0x%x\n", classes[eventsCount].mcount);
result = STATUS_FAILED;
}
if (inf.fcount != classes[eventsCount].fcount) {
printf("(#%" PRIuPTR ") wrong number of fields: 0x%x",
eventsCount, inf.fcount);
printf(", expected: 0x%x\n", classes[eventsCount].fcount);
result = STATUS_FAILED;
}
if (inf.icount != classes[eventsCount].icount) {
printf("(#%" PRIuPTR ") wrong number of interfaces: 0x%x",
eventsCount, inf.icount);
printf(", expected: 0x%x\n", classes[eventsCount].icount);
result = STATUS_FAILED;
}
eventsCount++;
}
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_classprep001(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_classprep001(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_classprep001(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jvmtiError err;
jint res;
if (options != NULL && strcmp(options, "printdump") == 0) {
printdump = JNI_TRUE;
}
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == NULL) {
printf("Wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
callbacks.ClassPrepare = &ClassPrepare;
err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
if (err != JVMTI_ERROR_NONE) {
printf("(SetEventCallbacks) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
return JNI_OK;
}
JNIEXPORT void JNICALL
Java_nsk_jvmti_ClassPrepare_classprep001_getReady(JNIEnv *env, jclass cls, jthread thread) {
jvmtiError err;
if (jvmti == NULL) {
printf("JVMTI client was not properly loaded!\n");
return;
}
err = jvmti->SetEventNotificationMode(JVMTI_ENABLE,
JVMTI_EVENT_CLASS_PREPARE, thread);
if (err == JVMTI_ERROR_NONE) {
eventsExpected = sizeof(classes)/sizeof(class_info);
} else {
printf("Failed to enable JVMTI_EVENT_CLASS_PREPARE: %s (%d)\n",
TranslateError(err), err);
result = STATUS_FAILED;
}
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_ClassPrepare_classprep001_check(JNIEnv *env, jclass cls, jthread thread) {
jvmtiError err;
if (jvmti == NULL) {
printf("JVMTI client was not properly loaded!\n");
return STATUS_FAILED;
}
err = jvmti->SetEventNotificationMode(JVMTI_DISABLE,
JVMTI_EVENT_CLASS_PREPARE, thread);
if (err != JVMTI_ERROR_NONE) {
printf("Failed to disable JVMTI_EVENT_CLASS_PREPARE: %s (%d)\n",
TranslateError(err), err);
result = STATUS_FAILED;
}
if (eventsCount != eventsExpected) {
printf("Wrong number of class prepare events: %" PRIuPTR ", expected: %" PRIuPTR "\n",
eventsCount, eventsExpected);
result = STATUS_FAILED;
}
return result;
}
}