361 lines
11 KiB
C++
361 lines
11 KiB
C++
/*
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* Copyright (c) 2003, 2022, 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 <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "jvmti.h"
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#include "jvmti_common.h"
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extern "C" {
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#define PASSED 0
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#define STATUS_FAILED 2
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#define EXP_STATUS (JVMTI_CLASS_STATUS_VERIFIED | JVMTI_CLASS_STATUS_PREPARED)
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typedef struct {
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char *sig;
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jint status;
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jint mcount;
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jint fcount;
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jint icount;
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} class_info;
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static jvmtiEnv *jvmti = NULL;
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static jvmtiEventCallbacks callbacks;
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static jint result = PASSED;
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static size_t eventsCount = 0;
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static size_t eventsExpected = 0;
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static class_info *classes;
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static class_info kernel_classes[] = {
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{ (char *)"Lclassprep01$TestInterface;", EXP_STATUS, 2, 1, 0 },
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{ (char *)"Lclassprep01$TestClass;", EXP_STATUS, 3, 2, 1 }
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};
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static class_info virtual_classes[] = {
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{ (char *)"Lclassprep01$TestInterfaceVirtual;", EXP_STATUS, 2, 1, 0 },
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{ (char *)"Lclassprep01$TestClassVirtual;", EXP_STATUS, 3, 2, 1 }
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};
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// These classes are loaded on a different thread.
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// We should not get ClassPrepare events for them.
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static const class_info unexpectedClasses[] = {
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{ (char *)"Lclassprep01$TestInterface2;", 0, 0, 0, 0 },
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{ (char *)"Lclassprep01$TestClass2;", 0, 0, 0, 0}
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};
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void printStatus(jint status) {
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int flags = 0;
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if ((status & JVMTI_CLASS_STATUS_VERIFIED) != 0) {
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LOG("JVMTI_CLASS_STATUS_VERIFIED");
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flags++;
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}
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if ((status & JVMTI_CLASS_STATUS_PREPARED) != 0) {
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if (flags > 0) LOG(" | ");
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LOG("JVMTI_CLASS_STATUS_PREPARED");
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flags++;
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}
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if ((status & JVMTI_CLASS_STATUS_INITIALIZED) != 0) {
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if (flags > 0) LOG(" | ");
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LOG("JVMTI_CLASS_STATUS_INITIALIZED");
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flags++;
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}
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if ((status & JVMTI_CLASS_STATUS_ERROR) != 0) {
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if (flags > 0) LOG(" | ");
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LOG("JVMTI_CLASS_STATUS_ERROR");
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flags++;
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}
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LOG(" (0x%x)\n", status);
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}
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const size_t NOT_FOUND = (size_t)(-1);
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size_t findClass(const char *classSig, const class_info *arr, int size) {
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for (int i = 0; i < size; i++) {
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if (strcmp(classSig, arr[i].sig) == 0) {
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return i;
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}
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}
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return NOT_FOUND;
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}
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void JNICALL ClassPrepare(jvmtiEnv *jvmti, JNIEnv *jni, jthread thr, jclass cls) {
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jvmtiError err;
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class_info inf;
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jmethodID *methods;
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jfieldID *fields;
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jclass *interfaces;
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char *name, *sig, *generic;
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err = jvmti->GetClassSignature(cls, &inf.sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassSignature#%" PRIuPTR ") unexpected error: %s (%d)\n", eventsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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// filter only events for test classes using classprep01 as a prefix
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// there are a lot of classes might be generated and loaded
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if (strncmp("Lclassprep01", inf.sig, 12) != 0) {
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return;
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}
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err = jvmti->GetClassStatus(cls, &inf.status);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassStatus#%" PRIuPTR ") unexpected error: %s (%d)\n", eventsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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}
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err = jvmti->GetClassMethods(cls, &inf.mcount, &methods);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassMethods#%" PRIuPTR ") unexpected error: %s (%d)\n", eventsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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err = jvmti->GetClassFields(cls, &inf.fcount, &fields);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetClassMethods#%" PRIuPTR ") unexpected error: %s (%d)\n", eventsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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err = jvmti->GetImplementedInterfaces(cls, &inf.icount, &interfaces);
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if (err != JVMTI_ERROR_NONE) {
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LOG("(GetImplementedInterfaces#%" PRIuPTR ") unexpected error: %s (%d)\n", eventsCount, TranslateError(err), err);
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result = STATUS_FAILED;
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return;
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}
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LOG(">>> [class prepare event #%" PRIuPTR "]", eventsCount);
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LOG(" \"%s\"\n", inf.sig);
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LOG(">>> Got ClassPrep event in thread.\n");
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print_thread_info(jvmti, jni, thr);
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LOG(">>> status: ");
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printStatus(inf.status);
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LOG(">>> %d methods:", inf.mcount);
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for (int i = 0; i < inf.mcount; i++) {
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if (i > 0) LOG(",");
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if (methods[i] == NULL) {
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LOG(" null");
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} else {
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err = jvmti->GetMethodName(methods[i], &name, &sig, &generic);
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if (err == JVMTI_ERROR_NONE) {
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LOG(" \"%s%s\"", name, sig);
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} else {
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LOG(" <ERRROR in GetMethodName: %s (%d)> ", TranslateError(err), err);
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}
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}
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}
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LOG("\n");
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LOG(">>> %d fields:", inf.fcount);
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for (int i = 0; i < inf.fcount; i++) {
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if (i > 0) LOG(",");
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if (fields[i] == NULL) {
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LOG(" null");
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} else {
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err = jvmti->GetFieldName(cls, fields[i], &name, &sig, &generic);
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if (err == JVMTI_ERROR_NONE) {
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LOG(" \"%s, %s\"", name, sig);
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} else {
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LOG(" <ERRROR in GetFieldName: %s (%d)> ", TranslateError(err), err);
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}
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}
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}
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LOG("\n");
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LOG(">>> %d interfaces:", inf.icount);
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for (int i = 0; i < inf.icount; i++) {
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if (i > 0) LOG(",");
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if (interfaces[i] == NULL) {
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LOG(" null");
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} else {
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err = jvmti->GetClassSignature(interfaces[i], &sig, &generic);
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if (err == JVMTI_ERROR_NONE) {
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LOG(" \"%s\"", sig);
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} else {
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LOG(" <ERRROR in GetClassSignature: %s (%d)> ", TranslateError(err), err);
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}
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}
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}
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LOG("\n");
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size_t expectedClassIdx = findClass(inf.sig, classes, 2);
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// Test classes loading may cause system classes loading - skip them.
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if (expectedClassIdx == NOT_FOUND) {
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size_t unexpectedClassIdx = findClass(inf.sig, unexpectedClasses,
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sizeof(unexpectedClasses)/sizeof(class_info));
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if (unexpectedClassIdx != NOT_FOUND) {
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printf("# wrong class: \"%s\"\n", inf.sig);
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result = STATUS_FAILED;
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}
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return;
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}
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if (eventsCount != expectedClassIdx) {
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printf("(#%" PRIuPTR ") unexpected order: %" PRIuPTR ", expected: %" PRIuPTR "\n",
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eventsCount, expectedClassIdx, eventsCount);
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result = STATUS_FAILED;
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return;
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}
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if (jni->IsVirtualThread(thr) != (classes == virtual_classes)) {
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LOG("Thread IsVirtual differs from expected. Check log.\n");
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result = STATUS_FAILED;
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return;
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}
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if (inf.sig == NULL || strcmp(inf.sig, classes[eventsCount].sig) != 0) {
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LOG("(#%" PRIuPTR ") wrong class: \"%s\"", eventsCount, inf.sig);
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LOG(", expected: \"%s\"\n", classes[eventsCount].sig);
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result = STATUS_FAILED;
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}
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if (inf.status != classes[eventsCount].status) {
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LOG("(#%" PRIuPTR ") wrong status: ", eventsCount);
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printStatus(inf.status);
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LOG(" expected: ");
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printStatus(classes[eventsCount].status);
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result = STATUS_FAILED;
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}
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if (inf.mcount != classes[eventsCount].mcount) {
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LOG("(#%" PRIuPTR ") wrong number of methods: 0x%x", eventsCount, inf.mcount);
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LOG(", expected: 0x%x\n", classes[eventsCount].mcount);
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result = STATUS_FAILED;
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}
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if (inf.fcount != classes[eventsCount].fcount) {
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LOG("(#%" PRIuPTR ") wrong number of fields: 0x%x", eventsCount, inf.fcount);
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LOG(", expected: 0x%x\n", classes[eventsCount].fcount);
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result = STATUS_FAILED;
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}
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if (inf.icount != classes[eventsCount].icount) {
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LOG("(#%" PRIuPTR ") wrong number of interfaces: 0x%x", eventsCount, inf.icount);
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LOG(", expected: 0x%x\n", classes[eventsCount].icount);
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result = STATUS_FAILED;
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}
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eventsCount++;
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}
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jvmtiCapabilities caps;
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jvmtiError err;
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jint res;
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
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if (res != JNI_OK || jvmti == NULL) {
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LOG("Wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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memset(&caps, 0, sizeof(jvmtiCapabilities));
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caps.can_support_virtual_threads = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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return JNI_ERR;
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}
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err = jvmti->GetCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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return JNI_ERR;
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}
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if (!caps.can_support_virtual_threads) {
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LOG("ERROR: virtual thread support is not implemented.\n");
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return JNI_ERR;
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}
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callbacks.ClassPrepare = &ClassPrepare;
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
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if (err != JVMTI_ERROR_NONE) {
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LOG("(SetEventCallbacks) unexpected error: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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return JNI_OK;
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}
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JNIEXPORT void JNICALL
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Java_classprep01_getReady(JNIEnv *jni, jclass cls, jthread thread) {
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jvmtiError err;
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if (jvmti == NULL) {
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LOG("JVMTI client was not properly loaded!\n");
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return;
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}
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eventsCount = 0;
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if (jni->IsVirtualThread(thread)) {
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classes = virtual_classes;
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eventsExpected = sizeof(virtual_classes)/sizeof(class_info);
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} else {
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classes = kernel_classes;
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eventsExpected = sizeof(kernel_classes)/sizeof(class_info);
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}
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LOG("Requesting enabling JVMTI_EVENT_CLASS_PREPARE in thread.\n");
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print_thread_info(jvmti, jni, thread);
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, thread);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Failed to enable JVMTI_EVENT_CLASS_PREPARE: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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}
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}
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JNIEXPORT jint JNICALL
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Java_classprep01_check(JNIEnv *jni, jclass cls, jthread thread) {
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jvmtiError err;
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if (jvmti == NULL) {
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LOG("JVMTI client was not properly loaded!\n");
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return STATUS_FAILED;
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}
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LOG("Requesting disabling JVMTI_EVENT_CLASS_PREPARE in thread.\n");
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print_thread_info(jvmti, jni, thread);
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err = jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_CLASS_PREPARE, thread);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Failed to disable JVMTI_EVENT_CLASS_PREPARE: %s (%d)\n", TranslateError(err), err);
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result = STATUS_FAILED;
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}
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if (eventsCount != eventsExpected) {
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LOG("Wrong number of class prepare events: %" PRIuPTR ", expected: %" PRIuPTR "\n", eventsCount, eventsExpected);
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result = STATUS_FAILED;
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}
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return result;
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}
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JNIEXPORT jint JNICALL Agent_OnLoad(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(JavaVM *jvm, char *options, void *reserved) {
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return Agent_Initialize(jvm, options, reserved);
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}
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}
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