320 lines
11 KiB
C
320 lines
11 KiB
C
/*
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* Copyright (c) 2016, 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 "jvmti.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef JNI_ENV_ARG
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#ifdef __cplusplus
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#define JNI_ENV_ARG(x, y) y
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#define JNI_ENV_PTR(x) x
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#else
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#define JNI_ENV_ARG(x,y) x, y
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#define JNI_ENV_PTR(x) (*x)
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#endif
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#endif
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#define TranslateError(err) "JVMTI error"
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#define PASSED 0
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#define FAILED 2
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static const char *EXPECTED_SIGNATURE = "Ljava/util/Collections;";
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static const char *EXC_CNAME = "java/lang/Exception";
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static jvmtiEnv *jvmti = NULL;
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static jint result = PASSED;
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static jboolean printdump = JNI_FALSE;
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static jboolean with_early_vm_start_capability = JNI_FALSE;
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static jboolean class_in_class_load_events_vm_start = JNI_FALSE;
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static jboolean class_in_class_load_events_vm_live = JNI_FALSE;
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static jboolean class_in_class_prepare_events_vm_start = JNI_FALSE;
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static jboolean class_in_class_prepare_events_vm_live = JNI_FALSE;
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static int class_load_events_vm_start_count = 0;
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static int class_prepare_events_vm_start_count = 0;
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static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
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JNIEXPORT
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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
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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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JNIEXPORT
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jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) {
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return JNI_VERSION_9;
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}
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static
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jint throw_exc(JNIEnv *env, char *msg) {
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jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME));
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if (exc_class == NULL) {
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printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME);
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return -1;
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}
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return JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg);
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}
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static void JNICALL
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Callback_ClassFileLoad(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) {
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jvmtiPhase phase;
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char *sig, *generic;
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jvmtiError err;
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err = (*jvmti)->GetPhase(jvmti_env,&phase);
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if (err != JVMTI_ERROR_NONE) {
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printf("ClassLoad event: GetPhase error: %s (%d)\n", TranslateError(err), err);
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result = FAILED;
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return;
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}
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if (phase == JVMTI_PHASE_START || phase == JVMTI_PHASE_LIVE) {
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err = (*jvmti)->GetClassSignature(jvmti_env, klass, &sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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printf("ClassLoad event: GetClassSignature error: %s (%d)\n", TranslateError(err), err);
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result = FAILED;
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return;
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}
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if (phase == JVMTI_PHASE_START) {
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class_load_events_vm_start_count++;
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if(strcmp(sig, EXPECTED_SIGNATURE) == 0) {
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class_in_class_load_events_vm_start = JNI_TRUE;
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}
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} else {
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if(strcmp(sig, EXPECTED_SIGNATURE) == 0) {
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class_in_class_load_events_vm_live = JNI_TRUE;
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}
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}
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if (printdump == JNI_TRUE) {
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printf(">>> ClassLoad event: phase(%d), class signature %s\n", phase, sig == NULL ? "null": sig);
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}
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} else {
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printf("ClassLoad event: get event in unexpected phase(%d)\n", phase);
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result = FAILED;
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}
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}
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static void JNICALL
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Callback_ClassFilePrepare(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread, jclass klass) {
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jvmtiPhase phase;
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char *sig, *generic;
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jvmtiError err;
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err = (*jvmti)->GetPhase(jvmti_env,&phase);
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if (err != JVMTI_ERROR_NONE) {
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printf("ClassPrepare event: GetPhase error: %s (%d)\n", TranslateError(err), err);
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result = FAILED;
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return;
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}
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if (phase == JVMTI_PHASE_START || phase == JVMTI_PHASE_LIVE) {
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err = (*jvmti)->GetClassSignature(jvmti_env, klass, &sig, &generic);
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if (err != JVMTI_ERROR_NONE) {
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printf("ClassPrepare event: GetClassSignature error: %s (%d)\n", TranslateError(err), err);
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result = FAILED;
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return;
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}
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if (phase == JVMTI_PHASE_START) {
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class_prepare_events_vm_start_count++;
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if(strcmp(sig, EXPECTED_SIGNATURE) == 0) {
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class_in_class_prepare_events_vm_start = JNI_TRUE;
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}
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} else {
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if(strcmp(sig, EXPECTED_SIGNATURE) == 0) {
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class_in_class_prepare_events_vm_live = JNI_TRUE;
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}
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}
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if (printdump == JNI_TRUE) {
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printf(">>> ClassPrepare event: phase(%d), class signature %s\n", phase, sig == NULL ? "null": sig);
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}
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} else {
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printf("ClassPrepare event: get event in unexpected phase(%d)\n", phase);
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result = FAILED;
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}
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}
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static
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res, size;
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jvmtiCapabilities caps;
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jvmtiEventCallbacks callbacks;
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jvmtiError err;
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if (options != NULL) {
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if (strstr(options, "with_early_vmstart") != NULL) {
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with_early_vm_start_capability = JNI_TRUE;
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}
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if (strstr(options, "printdump") != NULL) {
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printdump = JNI_TRUE;
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}
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}
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res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti),
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JVMTI_VERSION_9);
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if (res != JNI_OK || jvmti == NULL) {
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printf(" Error: wrong result of a valid call to GetEnv!\n");
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return JNI_ERR;
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}
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if (with_early_vm_start_capability == JNI_TRUE) {
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printf("Enabling following capability: can_generate_early_vmstart\n");
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_early_vmstart = 1;
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err = (*jvmti)->AddCapabilities(jvmti, &caps);
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if (err != JVMTI_ERROR_NONE) {
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printf(" Error in AddCapabilites: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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}
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size = (jint)sizeof(callbacks);
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.ClassLoad = Callback_ClassFileLoad;
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callbacks.ClassPrepare = Callback_ClassFilePrepare;
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err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, size);
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if (err != JVMTI_ERROR_NONE) {
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printf(" Error in SetEventCallbacks: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_LOAD, NULL);
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if (err != JVMTI_ERROR_NONE) {
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printf(" Error in SetEventNotificationMode: %s (%d)\n", TranslateError(err), err);
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return JNI_ERR;
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}
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err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_PREPARE, NULL);
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if (err != JVMTI_ERROR_NONE) {
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printf(" Error in SetEventNotificationMode: %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 jint JNICALL
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Java_MAAClassLoadPrepare_check(JNIEnv *env, jclass cls) {
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jobject loader = NULL;
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if (jvmti == NULL) {
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throw_exc(env, "JVMTI client was not properly loaded!\n");
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return FAILED;
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}
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if (with_early_vm_start_capability == JNI_TRUE) {
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/*
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* Expecting that "java/util/Collections" class from java.base module is present in the
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* ClassLoad and ClassPrepare events during VM Start phase when can_generate_early_vmstart
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* capability is enabled.
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* Expecting that ClassLoad and ClassPrepare events are sent in the VM early start phase
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* when can_generate_early_vmstart is enabled(JDK-8165681).
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*/
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if (class_load_events_vm_start_count == 0) {
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throw_exc(env, "Didn't get ClassLoad events in start phase!\n");
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return FAILED;
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}
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printf("Expecting to find '%s' class in ClassLoad events during VM early start phase.\n", EXPECTED_SIGNATURE);
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if (class_in_class_load_events_vm_start == JNI_FALSE) {
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throw_exc(env, "Unable to find expected class in ClassLoad events during early start phase!\n");
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return FAILED;
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}
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if (class_prepare_events_vm_start_count == 0) {
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throw_exc(env, "Didn't get ClassPrepare events in start phase!\n");
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return FAILED;
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}
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printf("Expecting to find '%s' class in ClassPrepare events during VM early start phase.\n", EXPECTED_SIGNATURE);
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if (class_in_class_prepare_events_vm_start == JNI_FALSE) {
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throw_exc(env, "Unable to find expected class in ClassPrepare events during early start phase!\n");
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return FAILED;
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}
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} else {
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/*
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* Expecting that "java/util/Collections" class from java.base module is not present in the
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* ClassLoad and ClassPrepare events during VM Start phase when can_generate_early_vmstart
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* capability is disabled.
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*/
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printf("Expecting that '%s' class is absent in ClassLoad events during normal VM start phase.\n", EXPECTED_SIGNATURE);
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if (class_in_class_prepare_events_vm_start == JNI_TRUE) {
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throw_exc(env, "Class is found in ClassLoad events during normal VM start phase!\n");
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return FAILED;
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}
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printf("Expecting that '%s' class is absent in ClassPrepare events during normal VM start phase.\n", EXPECTED_SIGNATURE);
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if (class_in_class_prepare_events_vm_start == JNI_TRUE) {
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throw_exc(env, "Class is found in ClassPrepare events during normal VM start phase!\n");
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return FAILED;
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}
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}
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/*
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* In any case, we not expect to see "java/util/Collections" class from java.base module
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* in the ClassLoad and ClassPrepare events during VM Live phase.
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*/
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if (class_in_class_prepare_events_vm_live == JNI_TRUE) {
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throw_exc(env, "Class is found in ClassLoad events during VM Live phase!\n");
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return FAILED;
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}
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if (class_in_class_prepare_events_vm_live == JNI_TRUE) {
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throw_exc(env, "Class is found in ClassPrepare events during VM Live phase!\n");
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return FAILED;
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}
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return result;
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}
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#ifdef __cplusplus
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}
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#endif
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