/*
 * Copyright (c) 2004, 2018, 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.h"
#include "jni_tools.h"
#include "jvmti_tools.h"

extern "C" {

/* ============================================================================= */

static jlong timeout = 0;
static jvmtiEnv* st_jvmti = NULL;
static int *user_data = 0, objCounter = 0;
static jlong nanos = 0;
static jvmtiTimerInfo timer_info1, timer_info2;
static const char* debugeeClassSignature = "Lnsk/jvmti/IterateOverObjectsReachableFromObject/iterobjreachobj005;";
static const char* objectFieldName = "object";

/* ============================================================================= */

jvmtiIterationControl JNICALL
objectReferenceCallback(jvmtiObjectReferenceKind reference_kind,
                        jlong  class_tag,
                        jlong  size,
                        jlong* tag_ptr,
                        jlong  referrer_tag,
                        jint   referrer_index,
                        void*  user_data) {

    objCounter++;

    if (!NSK_JVMTI_VERIFY(st_jvmti->GetCurrentThreadCpuTimerInfo(&timer_info1))) {
        nsk_jvmti_setFailStatus();
    }
    /* Check the returned jvmtiTimerInfo structure */
    if (timer_info1.max_value == 0) {
        NSK_COMPLAIN0("GetCurrentThreadCpuTimerInfo returned zero in jvmtiTimerInfo.max_value\n");
        nsk_jvmti_setFailStatus();
    }
    if (timer_info1.may_skip_forward != JNI_TRUE && timer_info1.may_skip_forward != JNI_FALSE) {
        NSK_COMPLAIN0("GetCurrentThreadCpuTimerInfo returned unknown type value in jvmtiTimerInfo.may_skip_forward\n");
        nsk_jvmti_setFailStatus();
    }
    if (timer_info1.may_skip_backward != JNI_TRUE && timer_info1.may_skip_backward != JNI_FALSE) {
        NSK_COMPLAIN0("GetCurrentThreadCpuTimerInfo returned unknown type value in jvmtiTimerInfo.may_skip_backward\n");
        nsk_jvmti_setFailStatus();
    }
    /* ---------------------------------------------------------------------- */

    if (!NSK_JVMTI_VERIFY(st_jvmti->GetCurrentThreadCpuTime(&nanos))) {
        nsk_jvmti_setFailStatus();
    }
    /* ---------------------------------------------------------------------- */

    if (!NSK_JVMTI_VERIFY(st_jvmti->GetTimerInfo(&timer_info2))) {
        nsk_jvmti_setFailStatus();
    }
    /* Check the returned jvmtiTimerInfo structure */
    if (timer_info2.max_value == 0) {
        NSK_COMPLAIN0("GetTimerInfo returned zero in jvmtiTimerInfo.max_value\n");
        nsk_jvmti_setFailStatus();
    }
    if (timer_info2.may_skip_forward != JNI_TRUE && timer_info2.may_skip_forward != JNI_FALSE) {
        NSK_COMPLAIN0("GetTimerInfo returned unknown type value in jvmtiTimerInfo.may_skip_forward\n");
        nsk_jvmti_setFailStatus();
    }
    if (timer_info2.may_skip_backward != JNI_TRUE && timer_info2.may_skip_backward != JNI_FALSE) {
        NSK_COMPLAIN0("GetTimerInfo returned unknown type value in jvmtiTimerInfo.may_skip_backward\n");
        nsk_jvmti_setFailStatus();
    }
    /* ---------------------------------------------------------------------- */

    nanos = 0;
    if (!NSK_JVMTI_VERIFY(st_jvmti->GetTime(&nanos))) {
        nsk_jvmti_setFailStatus();
    }

    /*  Iterate over only first object */
    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;

    do {
        NSK_DISPLAY0("Calling IterateOverInstancesOfClass with filter JVMTI_HEAP_OBJECT_EITHER\n");
        {
            jclass debugeeClass = NULL;
            jfieldID objectField = NULL;
            jobject object = NULL;

            NSK_DISPLAY1("Find debugee class: %s\n", debugeeClassSignature);
            debugeeClass = nsk_jvmti_classBySignature(debugeeClassSignature);
            if (debugeeClass == NULL) {
                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)) != NULL)) {
                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)) != NULL)) {
                nsk_jvmti_setFailStatus();
                break;
            }

            NSK_DISPLAY0("Calling IterateOverObjectsReachableFromObject with filter JVMTI_HEAP_OBJECT_EITHER\n");
            {
                if (!NSK_JVMTI_VERIFY(jvmti->IterateOverObjectsReachableFromObject(
                        object, objectReferenceCallback, &user_data))) {
                    nsk_jvmti_setFailStatus();
                }
            }

            if (objCounter == 0) {
                NSK_COMPLAIN0("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_iterobjreachobj005(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_iterobjreachobj005(JavaVM *jvm, char *options, void *reserved) {
    return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_iterobjreachobj005(JavaVM *jvm, char *options, void *reserved) {
    return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
    jvmtiEnv* jvmti = NULL;

    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)) != NULL))
        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;
        caps.can_get_current_thread_cpu_time = 1;

        if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) {
            return JNI_ERR;
        }
    }

    if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
        return JNI_ERR;

    return JNI_OK;
}

/* ============================================================================= */

}