371 lines
12 KiB
C++
371 lines
12 KiB
C++
/*
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* Copyright (c) 2020 SAP SE. 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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#include "jni.h"
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extern "C" {
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#define FAILED -1
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#define OK 0
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static jvmtiEnv *jvmti;
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static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved);
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static void ShowErrorMessage(jvmtiEnv *jvmti, jvmtiError errCode, const char *message) {
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char *errMsg;
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jvmtiError result;
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result = jvmti->GetErrorName(errCode, &errMsg);
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if (result == JVMTI_ERROR_NONE) {
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fprintf(stderr, "%s: %s (%d)\n", message, errMsg, errCode);
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jvmti->Deallocate((unsigned char *)errMsg);
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} else {
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fprintf(stderr, "%s (%d)\n", message, errCode);
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}
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}
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JNIEXPORT jint JNICALL
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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
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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 jint JNICALL
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JNI_OnLoad(JavaVM *jvm, void *reserved) {
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jint res;
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JNIEnv *env;
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res = jvm->GetEnv((void **) &env, JNI_VERSION_9);
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if (res != JNI_OK || env == nullptr) {
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fprintf(stderr, "Error: GetEnv call failed(%d)!\n", res);
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return JNI_ERR;
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}
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return JNI_VERSION_9;
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}
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static jint
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Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
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jint res;
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printf("Agent_OnLoad started\n");
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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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fprintf(stderr, "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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printf("Agent_OnLoad finished\n");
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return JNI_OK;
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}
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JNIEXPORT jint JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_acquireCanTagObjectsCapability(JNIEnv *env, jclass cls) {
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jvmtiError err;
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jvmtiCapabilities caps;
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memset(&caps, 0, sizeof(caps));
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caps.can_tag_objects = 1;
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err = jvmti->AddCapabilities(&caps);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"acquireCanTagObjectsCapability: error in JVMTI AddCapabilities");
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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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ShowErrorMessage(jvmti, err,
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"acquireCanTagObjectsCapability: error in JVMTI GetCapabilities");
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return JNI_ERR;
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}
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if (!caps.can_tag_objects) {
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fprintf(stderr, "Warning: didn't get the capability can_tag_objects\n");
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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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static jobject method_IterateOverReachableObjects;
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static jobject method_IterateOverHeap;
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static jobject method_IterateOverInstancesOfClass;
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static jobject method_FollowReferences;
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static jobject method_IterateThroughHeap;
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JNIEXPORT jint JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_registerMethod(JNIEnv *env, jclass cls, jobject method, jstring name) {
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const char *name_chars = env->GetStringUTFChars(name, 0);
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int rc = FAILED;
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if (rc != OK && strcmp(name_chars, "IterateOverReachableObjects") == 0) {
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method_IterateOverReachableObjects = env->NewGlobalRef(method);
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rc = OK;
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}
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if (rc != OK && strcmp(name_chars, "IterateOverHeap") == 0) {
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method_IterateOverHeap = env->NewGlobalRef(method);
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rc = OK;
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}
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if (rc != OK && strcmp(name_chars, "IterateOverInstancesOfClass") == 0) {
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method_IterateOverInstancesOfClass = env->NewGlobalRef(method);
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rc = OK;
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}
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if (rc != OK && strcmp(name_chars, "IterateThroughHeap") == 0) {
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method_IterateThroughHeap = env->NewGlobalRef(method);
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rc = OK;
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}
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if (rc != OK && strcmp(name_chars, "FollowReferences") == 0) {
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method_FollowReferences = env->NewGlobalRef(method);
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rc = OK;
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}
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env->ReleaseStringUTFChars(name, name_chars);
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return rc;
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}
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JNIEXPORT void JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_agentTearDown(JNIEnv *env, jclass cls) {
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env->DeleteGlobalRef(method_IterateOverReachableObjects);
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env->DeleteGlobalRef(method_IterateOverHeap);
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env->DeleteGlobalRef(method_IterateOverInstancesOfClass);
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env->DeleteGlobalRef(method_FollowReferences);
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env->DeleteGlobalRef(method_IterateThroughHeap);
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}
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JNIEXPORT jint JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_jvmtiTagClass(JNIEnv *env, jclass cls, jclass clsToTag, jlong tag) {
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jvmtiError err;
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err = jvmti->SetTag(clsToTag, tag);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"jvmtiTagClass: error in JVMTI SetTag");
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return FAILED;
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}
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return OK;
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}
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typedef struct Tag_And_Counter {
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jlong instance_counter;
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jlong class_tag;
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jlong instance_tag;
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} Tag_And_Counter;
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static jvmtiIterationControl JNICALL
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__stackReferenceCallback(jvmtiHeapRootKind root_kind,
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jlong class_tag,
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jlong size,
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jlong* tag_ptr,
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jlong thread_tag,
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jint depth,
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jmethodID method,
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jint slot,
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void* d) {
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Tag_And_Counter* data = (Tag_And_Counter*) d;
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if (class_tag == data->class_tag && *tag_ptr == 0) {
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data->instance_counter++;
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*tag_ptr = data->instance_tag;
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}
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return JVMTI_ITERATION_CONTINUE;
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}
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static jvmtiIterationControl JNICALL
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__jvmtiHeapObjectCallback(jlong class_tag, jlong size, jlong* tag_ptr, void* d) {
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Tag_And_Counter* data = (Tag_And_Counter*) d;
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if (class_tag == data->class_tag && *tag_ptr == 0) {
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data->instance_counter++;
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*tag_ptr = data->instance_tag;
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}
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return JVMTI_ITERATION_CONTINUE;
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}
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static jint JNICALL
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__jvmtiHeapReferenceCallback(jvmtiHeapReferenceKind reference_kind,
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const jvmtiHeapReferenceInfo* reference_info,
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jlong class_tag,
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jlong referrer_class_tag,
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jlong size,
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jlong* tag_ptr,
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jlong* referrer_tag_ptr,
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jint length,
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void* d) {
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Tag_And_Counter* data = (Tag_And_Counter*) d;
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if (class_tag == data->class_tag && *tag_ptr == 0) {
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data->instance_counter++;
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*tag_ptr = data->instance_tag;
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}
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return JVMTI_VISIT_OBJECTS;
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}
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static jint JNICALL
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__jvmtiHeapIterationCallback(jlong class_tag,
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jlong size,
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jlong* tag_ptr,
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jint length,
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void* d) {
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Tag_And_Counter* data = (Tag_And_Counter*) d;
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if (class_tag == data->class_tag && *tag_ptr == 0) {
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data->instance_counter++;
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*tag_ptr = data->instance_tag;
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}
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return JVMTI_VISIT_OBJECTS;
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}
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JNIEXPORT jlong JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_countAndTagInstancesOfClass(JNIEnv *env,
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jclass cls,
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jclass tagged_class,
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jlong cls_tag,
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jlong instance_tag,
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jobject method) {
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jvmtiError err;
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jvmtiHeapCallbacks callbacks = {};
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Tag_And_Counter data = {0, cls_tag, instance_tag};
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jboolean method_found = JNI_FALSE;
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jint idx = 0;
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if (env->IsSameObject(method, method_IterateOverReachableObjects)) {
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method_found = JNI_TRUE;
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err = jvmti->IterateOverReachableObjects(nullptr /*jvmtiHeapRootCallback*/,
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__stackReferenceCallback,
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nullptr /* jvmtiObjectReferenceCallback */,
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&data);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"countAndTagInstancesOfClass: error in JVMTI IterateOverReachableObjects");
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return FAILED;
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}
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}
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if (env->IsSameObject(method, method_IterateOverHeap)) {
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method_found = JNI_TRUE;
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err = jvmti->IterateOverHeap(JVMTI_HEAP_OBJECT_EITHER,
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__jvmtiHeapObjectCallback,
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&data);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"countAndTagInstancesOfClass: error in JVMTI IterateOverHeap");
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return FAILED;
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}
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}
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if (env->IsSameObject(method, method_IterateOverInstancesOfClass)) {
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method_found = JNI_TRUE;
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err = jvmti->IterateOverInstancesOfClass(tagged_class,
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JVMTI_HEAP_OBJECT_EITHER,
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__jvmtiHeapObjectCallback,
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&data);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"countAndTagInstancesOfClass: error in JVMTI IterateOverHeap");
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return FAILED;
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}
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}
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if (env->IsSameObject(method, method_FollowReferences)) {
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method_found = JNI_TRUE;
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callbacks.heap_reference_callback = __jvmtiHeapReferenceCallback;
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err = jvmti->FollowReferences(0 /* filter nothing */,
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nullptr /* no class filter */,
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nullptr /* no initial object, follow roots */,
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&callbacks,
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&data);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"countAndTagInstancesOfClass: error in JVMTI FollowReferences");
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return FAILED;
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}
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}
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if (env->IsSameObject(method, method_IterateThroughHeap)) {
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method_found = JNI_TRUE;
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callbacks.heap_iteration_callback = __jvmtiHeapIterationCallback;
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err = jvmti->IterateThroughHeap(0 /* filter nothing */,
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nullptr /* no class filter */,
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&callbacks,
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&data);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"countAndTagInstancesOfClass: error in JVMTI IterateThroughHeap");
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return FAILED;
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}
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}
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if (!method_found) {
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fprintf(stderr, "countAndTagInstancesOfClass: unknown method\n");
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return FAILED;
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}
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return data.instance_counter;
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}
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JNIEXPORT jlong JNICALL
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Java_IterateHeapWithEscapeAnalysisEnabled_getObjectsWithTag(JNIEnv *env,
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jclass cls,
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jlong tag,
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jobjectArray res_instances) {
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jvmtiError err;
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const jlong tags[1] = {tag};
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jint res_count = -1;
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jobject* res_instances_raw;
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jlong* res_tags;
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jint res_instances_length;
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jint idx;
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err = jvmti->GetObjectsWithTags(1,
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tags,
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&res_count,
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&res_instances_raw,
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&res_tags);
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if (err != JVMTI_ERROR_NONE) {
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ShowErrorMessage(jvmti, err,
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"getObjectsWithTags: error in JVMTI GetObjectsWithTags");
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return FAILED;
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}
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res_instances_length = env->GetArrayLength(res_instances);
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if (res_count != res_instances_length) {
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fprintf(stderr, "getObjectsWithTags: result array lenght (%d) does not match instance count returned by GetObjectsWithTags (%d) \n",
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res_instances_length, res_count);
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return FAILED;
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}
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for (idx = 0; idx < res_count; idx++) {
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env->SetObjectArrayElement(res_instances, idx, res_instances_raw[idx]);
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}
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jvmti->Deallocate((unsigned char *)res_instances_raw);
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jvmti->Deallocate((unsigned char *)res_tags);
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return OK;
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}
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}
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