116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
/*
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* Copyright (c) 2021, 2024, 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 <string.h>
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#include "jvmti.h"
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#include "jvmti_common.hpp"
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extern "C" {
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static jvmtiEnv *jvmti = nullptr;
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// JVMTI_ERROR_WRONG_PHASE guard
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static jrawMonitorID event_mon = nullptr;
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static bool is_vm_dead = false;
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static int number_of_allocation = 0;
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extern JNIEXPORT void JNICALL
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VMObjectAlloc(jvmtiEnv *jvmti,
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JNIEnv* jni,
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jthread thread,
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jobject object,
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jclass cls,
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jlong size) {
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RawMonitorLocker locker(jvmti, jni, event_mon);
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if (is_vm_dead) {
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return;
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}
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char *signature = nullptr;
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jvmtiError err = jvmti->GetClassSignature(cls, &signature, nullptr);
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if (err != JVMTI_ERROR_NONE) {
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jni->FatalError("Failed during the GetClassSignature call");
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}
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LOG("VMObjectAlloc called for %s\n", signature);
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if (!strcmp(signature, "LVMObjectAllocTest;")) {
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number_of_allocation++;
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}
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}
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static void JNICALL
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VMDeath(jvmtiEnv *jvmti, JNIEnv* jni) {
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RawMonitorLocker locker(jvmti, jni, event_mon);
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LOG("VMDeath\n");
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is_vm_dead = true;
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}
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JNIEXPORT jint JNICALL
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Java_VMObjectAllocTest_getNumberOfAllocation(JNIEnv *env, jclass cls) {
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return number_of_allocation;
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}
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extern JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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jvmtiEventCallbacks callbacks;
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jvmtiError err;
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jvmtiCapabilities caps;
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if (jvm->GetEnv((void **) &jvmti, JVMTI_VERSION) != JNI_OK) {
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return JNI_ERR;
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}
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err = jvmti->CreateRawMonitor("Event Monitor", &event_mon);
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if (err != JVMTI_ERROR_NONE) {
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LOG("Agent_OnLoad: CreateRawMonitor failed: %d\n", err);
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return JNI_ERR;
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}
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.VMObjectAlloc = &VMObjectAlloc;
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callbacks.VMDeath = &VMDeath;
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memset(&caps, 0, sizeof(caps));
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caps.can_generate_vm_object_alloc_events = 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->SetEventCallbacks(&callbacks, sizeof(jvmtiEventCallbacks));
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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->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_OBJECT_ALLOC , nullptr);
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if (err != JVMTI_ERROR_NONE) {
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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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} //extern "C"
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