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/*
* Copyright (c) 2004, 2024, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#include <string.h>
#include "jvmti.h"
#include "agent_common.hpp"
#include "jni_tools.hpp"
#include "jvmti_tools.hpp"
extern "C" {
/* ============================================================================= */
static jlong timeout = 0;
static long objectCount = 0;
static int userData = 0, allocationError = 0;
static jvmtiEnv* st_jvmti = nullptr;
static const char* debugeeClassSignature = "Lnsk/jvmti/IterateOverObjectsReachableFromObject/iterobjreachobj002;";
static const char* objectFieldName = "object";
typedef struct ObjectDescStruct {
jlong tag;
jlong size;
} ObjectDesc;
static ObjectDesc *objectDescBuf;
/* ============================================================================= */
/* ============================================================================= */
/** jvmtiObjectReferenceCallback for first iteration. */
jvmtiIterationControl JNICALL
objectReferenceCallback1(jvmtiObjectReferenceKind reference_kind,
jlong class_tag,
jlong size,
jlong* tag_ptr,
jlong referrer_tag,
jint referrer_index,
void* user_data) {
objectCount++;
/* Set tag */
*tag_ptr = objectCount;
if (!NSK_JVMTI_VERIFY(st_jvmti->Allocate((sizeof(ObjectDesc)),
(unsigned char**)&objectDescBuf))) {
nsk_jvmti_setFailStatus();
allocationError = 1;
}
(*objectDescBuf).tag = *tag_ptr;
(*objectDescBuf).size = size;
return JVMTI_ITERATION_ABORT;
}
/** jvmtiObjectReferenceCallback for second iteration. */
jvmtiIterationControl JNICALL
objectReferenceCallback2(jvmtiObjectReferenceKind reference_kind,
jlong class_tag,
jlong size,
jlong* tag_ptr,
jlong referrer_tag,
jint referrer_index,
void* user_data) {
objectCount--;
if (!NSK_JVMTI_VERIFY(st_jvmti->Deallocate((unsigned char*)objectDescBuf))) {
nsk_jvmti_setFailStatus();
}
return JVMTI_ITERATION_ABORT;
}
/* ============================================================================= */
/** Agent algorithm. */
static void JNICALL
agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
NSK_DISPLAY0("Wait for debugee start\n");
if (!NSK_VERIFY(nsk_jvmti_waitForSync(timeout)))
return;
{
jclass debugeeClass = nullptr;
jfieldID objectField = nullptr;
jobject object = nullptr;
do {
NSK_DISPLAY1("Find debugee class: %s\n", debugeeClassSignature);
debugeeClass = nsk_jvmti_classBySignature(debugeeClassSignature);
if (debugeeClass == nullptr) {
nsk_jvmti_setFailStatus();
break;
}
NSK_DISPLAY1("Find static field in debugee class: %s\n", objectFieldName);
if (!NSK_JNI_VERIFY(jni, (objectField = jni->GetStaticFieldID(
debugeeClass, objectFieldName, debugeeClassSignature)) != nullptr)) {
nsk_jvmti_setFailStatus();
break;
}
NSK_DISPLAY1("Find value of static field in debugee class: %s\n", objectFieldName);
if (!NSK_JNI_VERIFY(jni, (object =
jni->GetStaticObjectField(debugeeClass, objectField)) != nullptr)) {
nsk_jvmti_setFailStatus();
break;
}
NSK_DISPLAY0("Calling IterateOverObjectsReachableFromObject with allocation\n");
{
if (!NSK_JVMTI_VERIFY(jvmti->IterateOverObjectsReachableFromObject(
object, objectReferenceCallback1, &userData))) {
nsk_jvmti_setFailStatus();
break;
}
}
if (objectCount == 0) {
NSK_COMPLAIN0("First IterateOverObjectsReachableFromObject call had not visited any object\n");
nsk_jvmti_setFailStatus();
break;
}
if (allocationError) break;
NSK_DISPLAY0("Calling IterateOverObjectsReachableFromObject with deallocation\n");
{
if (!NSK_JVMTI_VERIFY(jvmti->IterateOverObjectsReachableFromObject(
object, objectReferenceCallback2, &userData))) {
nsk_jvmti_setFailStatus();
break;
}
}
if (objectCount > 0) {
NSK_COMPLAIN0("Second IterateOverObjectsReachableFromObject call had not visited any object\n");
nsk_jvmti_setFailStatus();
}
} while (0);
}
NSK_DISPLAY0("Let debugee to finish\n");
if (!NSK_VERIFY(nsk_jvmti_resumeSync()))
return;
}
/* ============================================================================= */
/* ============================================================================= */
/** Agent library initialization. */
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_iterobjreachobj002(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_iterobjreachobj002(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_iterobjreachobj002(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jvmtiEnv* jvmti = nullptr;
if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
return JNI_ERR;
timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
if (!NSK_VERIFY((jvmti =
nsk_jvmti_createJVMTIEnv(jvm, reserved)) != nullptr))
return JNI_ERR;
/* save pointer to environment to use it in callbacks */
st_jvmti = jvmti;
{
jvmtiCapabilities caps;
memset(&caps, 0, sizeof(caps));
caps.can_tag_objects = 1;
if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
return JNI_ERR;
}
}
if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, nullptr)))
return JNI_ERR;
return JNI_OK;
}
/* ============================================================================= */
}
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