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96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
/*
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* Copyright (c) 2025, 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 "jvmti.h"
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#include "jvmti_common.hpp"
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#include <atomic>
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extern "C" {
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// SampledObjectAlloc event might be triggered on any thread
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static std::atomic<int> events_counter(0);
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JNIEXPORT void JNICALL
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SampledObjectAlloc(jvmtiEnv *jvmti, JNIEnv* jni, jthread thread, jobject object, jclass object_klass, jlong size) {
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events_counter++;
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LOG("Sampled object, events_counter = %d\n", events_counter.load());
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}
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void JNICALL
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VMDeath(jvmtiEnv *jvmti, JNIEnv* jni) {
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if (events_counter == 0) {
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fatal(jni, "SampledObjectAlloc events counter shouldn't be zero");
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}
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}
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jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jvmtiEnv* jvmti = nullptr;
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jvmtiCapabilities caps;
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jvmtiEventCallbacks callbacks;
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jvmtiError err;
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jint res;
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LOG("AGENT INIT");
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res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_9);
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if (res != JNI_OK || jvmti == nullptr) {
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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(caps));
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caps.can_generate_sampled_object_alloc_events = 1;
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if (jvmti->AddCapabilities(&caps) != JVMTI_ERROR_NONE) {
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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.SampledObjectAlloc = &SampledObjectAlloc;
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callbacks.VMDeath = &VMDeath;
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err = jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks));
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check_jvmti_error(err, "SetEventCallbacks");
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/*
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* Interval should be small enough to triggger sampling event while objects are init by VM.
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*/
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err = jvmti->SetHeapSamplingInterval(10);
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check_jvmti_error(err, "SetHeapSamplingInterval");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VM_DEATH, nullptr);
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check_jvmti_error(err, "SetEventNotificationMode");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_SAMPLED_OBJECT_ALLOC, nullptr);
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check_jvmti_error(err, "SetEventNotificationMode");
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return JNI_OK;
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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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