/*

 * 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"

#ifdef __cplusplus

extern "C" {

#endif

static JNIEnv *jni = NULL;

static jvmtiEnv *jvmti = NULL;

static jvmtiCapabilities caps;

static jlong timeout = 0;

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

static volatile long objectDescCount = 0;

static volatile int callbackAborted = 0;

static volatile int numberOfDeallocatedFromCallbacksDescriptors = 0;

typedef struct ObjectDescStruct {

    struct ObjectDescStruct *next;

} ObjectDesc;

static ObjectDesc* volatile objectDescList;

static ObjectDesc* *objectDescArr;

static unsigned char* deallocatedFlagsArr;

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

/** heapRootCallback for first heap iteration. */

jvmtiIterationControl JNICALL

heapObjectCallbackForFirstIteration(jlong class_tag,

                   jlong size,

                   jlong* tag_ptr,

                   void* user_data) {

    ObjectDesc *objectDescBuf;

    /* set tag */

    *tag_ptr = (jlong)++objectDescCount;

    /* Allocate memory for next list element*/

    if (!NSK_JVMTI_VERIFY(

            NSK_CPP_STUB3(Allocate, jvmti, (sizeof(ObjectDesc)),

                                               (unsigned char**)&objectDescBuf))) {

        nsk_jvmti_setFailStatus();

        callbackAborted = 1;

        NSK_COMPLAIN0("heapObjectCallbackForFirstIteration: Allocation failed. Iteration aborted.\n");

        return JVMTI_ITERATION_ABORT;

    }

    objectDescBuf->next = objectDescList;

    objectDescList = objectDescBuf;

    return JVMTI_ITERATION_CONTINUE;

}

/** heapRootCallback for second heap iterator. */

jvmtiIterationControl JNICALL

heapObjectCallbackForSecondIteration(jlong class_tag,

                   jlong size,

                   jlong* tag_ptr,

                   void* user_data) {

    long ind = (long)((*tag_ptr) - 1);

    if (ind < 0 || ind > objectDescCount ) {

        NSK_COMPLAIN1("heapObjectCallbackForSecondIteration: invalid object tag value: %d\n", (long)*tag_ptr);

        nsk_jvmti_setFailStatus();

        callbackAborted = 1;

        return JVMTI_ITERATION_ABORT;

    }

    /* Deallocate memory of list element*/

    if (!NSK_JVMTI_VERIFY(

            NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)objectDescArr[ind]))) {

        nsk_jvmti_setFailStatus();

        callbackAborted = 1;

        NSK_COMPLAIN0("heapObjectCallbackForSecondIteration: Deallocation failed. Iteration aborted.\n");

        return JVMTI_ITERATION_ABORT;

    }

    numberOfDeallocatedFromCallbacksDescriptors++;

    deallocatedFlagsArr[ind] = 1;

    /* unset tag */

    *tag_ptr = 0;

    return JVMTI_ITERATION_CONTINUE;

}

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

/** Agent algorithm. */

static void JNICALL

agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {

    long ind;

    ObjectDesc *objectDesc;

    int fakeUserData = 0;

    NSK_DISPLAY0("Wait for debugee start\n");

    if (!NSK_VERIFY(nsk_jvmti_waitForSync(timeout)))

        return;

    {

        do {

            objectDescList = NULL;

            NSK_DISPLAY0("Calling IterateOverHeap with filter JVMTI_HEAP_OBJECT_UNTAGGED\n");

            {

                if (!NSK_JVMTI_VERIFY(

                        NSK_CPP_STUB4(IterateOverHeap, jvmti,

                            JVMTI_HEAP_OBJECT_UNTAGGED, heapObjectCallbackForFirstIteration,

                            &fakeUserData))) {

                    nsk_jvmti_setFailStatus();

                    break;

                }

            }

            if (callbackAborted) break;

            if (objectDescCount == 0) {

                NSK_COMPLAIN0("First IterateOverHeap call had not visited any object\n");

                nsk_jvmti_setFailStatus();

                break;

            } else {

                NSK_DISPLAY1("Number of objects first IterateOverHeap visited: %d\n", objectDescCount);

            }

            /* Allocate memory for array to save pointers to ObjectDescList elements */

            if (!NSK_JVMTI_VERIFY(

                    NSK_CPP_STUB3(Allocate, jvmti, (objectDescCount * sizeof(ObjectDesc*)),

                                      (unsigned char**)&objectDescArr))) {

                nsk_jvmti_setFailStatus();

                break;

            }

            /* Allocate memory for flags array and fill with false values */

            if (!NSK_JVMTI_VERIFY(

                    NSK_CPP_STUB3(Allocate, jvmti, (objectDescCount * sizeof(unsigned char)),

                                      &deallocatedFlagsArr))) {

                nsk_jvmti_setFailStatus();

                break;

            }

            for (ind = 0; ind < objectDescCount; ind++) {

                deallocatedFlagsArr[ind] = 0;

            }

            /* Save all pointers to ObjectDescList elements in objectDescArr */

            objectDesc = objectDescList;

            for (ind = 0; ind < objectDescCount; ind++) {

                objectDescArr[ind] = objectDesc;

                objectDesc = objectDesc->next;

            }

            /* Verify objectDescCount and objectDescList length in agreement */

            if (!NSK_VERIFY(objectDesc == NULL)) {

               nsk_jvmti_setFailStatus();

               break;

            }

            NSK_DISPLAY0("Calling IterateOverHeap with filter JVMTI_HEAP_OBJECT_TAGGED\n");

            {

                if (!NSK_JVMTI_VERIFY(

                        NSK_CPP_STUB4(IterateOverHeap, jvmti,

                            JVMTI_HEAP_OBJECT_TAGGED, heapObjectCallbackForSecondIteration,

                            &fakeUserData))) {

                    nsk_jvmti_setFailStatus();

                }

            }

            if (numberOfDeallocatedFromCallbacksDescriptors == 0) {

                NSK_COMPLAIN1("Deallocate func. hasn't been called from IterateOverHeap'callback. "

                        "numberOfDeallocatedFromCallbacksDescriptors = %d\n", numberOfDeallocatedFromCallbacksDescriptors);

                nsk_jvmti_setFailStatus();

            }

            for (ind = 0; ind < objectDescCount; ind++) {

                if (!deallocatedFlagsArr[ind]) {

                    if (!NSK_JVMTI_VERIFY(

                           NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)objectDescArr[ind]))) {

                        NSK_COMPLAIN1("Unable to deallocate descriptor. Index = %d \n", ind);

                        nsk_jvmti_setFailStatus();

                        return;

                    }

                }

            }

            if (!NSK_JVMTI_VERIFY(

                    NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)objectDescArr))) {

                nsk_jvmti_setFailStatus();

            }

         if (!NSK_JVMTI_VERIFY(

                    NSK_CPP_STUB2(Deallocate, jvmti, (unsigned char*)deallocatedFlagsArr))) {

                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_iterheap004(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_iterheap004(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_iterheap004(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {

    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;

    memset(&caps, 0, sizeof(caps));

    caps.can_tag_objects = 1;

    if (!NSK_JVMTI_VERIFY(

            NSK_CPP_STUB2(AddCapabilities, jvmti, &caps))) {

        return JNI_ERR;

    }

    if (!NSK_JVMTI_VERIFY(NSK_CPP_STUB2(GetCapabilities,

            jvmti, &caps)))

        return JNI_ERR;

    if (!caps.can_tag_objects)

        NSK_DISPLAY0("Warning: tagging objects is not available\n");

    if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))

        return JNI_ERR;

    return JNI_OK;

}

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

#ifdef __cplusplus

}

#endif