/*

 * Copyright (c) 2003, 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 <stdio.h>

#include <stdarg.h>

#include <stdlib.h>

#include <string.h>

#include <jvmti.h>

#include "agent_common.h"

#include "nsk_tools.h"

#include "JVMTITools.h"

#include "jvmti_tools.h"

#include "native_thread.h"

extern "C" {

#define PASSED  0

#define STATUS_FAILED  2

#define TRIES 30

#define AGENTS 2

static JavaVM *vm;

static jvmtiEnv *jvmti[AGENTS]; /* JVMTI env of an agent */

static void *agentThr[AGENTS];

static volatile int redir[AGENTS]; /* redirection in an agent done */

static volatile int thrstarted[AGENTS]; /* an agent started */

static volatile int verbose = 0;

static volatile jint result = PASSED;

/* the original JNI function table */

static jniNativeInterface *orig_jni_functions[AGENTS];

/* the redirected JNI function table */

static jniNativeInterface *redir_jni_functions[AGENTS];

/* number of the redirected JNI function calls */

static volatile int redir_calls[AGENTS];

static void doRedirect(JNIEnv*, jvmtiEnv*, int);

static void provokeIntercept(JNIEnv*, const char*);

static int checkIntercept(int, int, int);

static int initAgent(int);

static void startAgent(int);

static int agentA(void*);

static int agentB(void*);

static void JNICALL VMInitA(jvmtiEnv*, JNIEnv*, jthread);

static void JNICALL VMInitB(jvmtiEnv*, JNIEnv*, jthread);

/** redirected JNI functions **/

/* function redirected inside the agent A */

jint JNICALL MyGetVersionA(JNIEnv *env) {

    redir_calls[0]++;

    NSK_DISPLAY1("\nMyGetVersionA: the function called successfully: number of calls=%d\n",

        redir_calls[0]);

    return orig_jni_functions[0]->GetVersion(env);

}

/* function redirected inside the agent B */

jint JNICALL MyGetVersionB(JNIEnv *env) {

    redir_calls[1]++;

    NSK_DISPLAY1("\nMyGetVersionB: the function called successfully: number of calls=%d\n",

        redir_calls[1]);

    return (orig_jni_functions[1])->GetVersion(env);

}

/*****************************/

static void doRedirect(JNIEnv *env, jvmtiEnv *jvmti, int indx) {

    jvmtiError err;

    NSK_DISPLAY1("\n%s JVMTI env: doRedirect: obtaining the JNI function table ...\n",

        (indx==0)?"first":"second");

        result = STATUS_FAILED;

        NSK_COMPLAIN2("TEST FAILED: %s JVMTI env: failed to get original JNI function table: %s\n",

            (indx==0)?"first":"second", TranslateError(err));

        env->FatalError("failed to get original JNI function table");

    }

        result = STATUS_FAILED;

        NSK_COMPLAIN2("TEST FAILED: %s JVMTI env: failed to get redirected JNI function table: %s\n",

            (indx==0)?"first":"second", TranslateError(err));

        env->FatalError("failed to get redirected JNI function table");

    }

    NSK_DISPLAY1(

        "%s JVMTI env: doRedirect: the JNI function table obtained successfully\n"

        "\toverwriting the function GetVersion() ...\n",

        (indx == 0) ? "first" : "second");

    redir_jni_functions[indx]->GetVersion =

        (indx==0)?MyGetVersionA:MyGetVersionB;

        result = STATUS_FAILED;

        NSK_COMPLAIN2("TEST FAILED: %s JVMTI env: failed to set new JNI function table: %s\n",

            (indx==0)?"first":"second", TranslateError(err));

        env->FatalError("failed to set new JNI function table");

    }

    NSK_DISPLAY1("%s JVMTI env: doRedirect: the functions are overwritten successfully\n",

        (indx==0)?"first":"second");

}

static void provokeIntercept(JNIEnv *env, const char *name) {

    jint res;

    res = env->GetVersion();

    NSK_DISPLAY2("\nGetVersion() called by the agent %s returns %d\n",

        name, res);

}

static int checkIntercept(int indx, int env_num, int exCalls) {

    if (redir_calls[indx] == exCalls) {

        NSK_DISPLAY5(

            "\nCHECK PASSED: GetVersion() interception set in the %s JVMTI env %s properly:\n"

            "\t%d interception(s) with the%s%s JVMTI env as expected\n",

            (indx==0)?"first":"second",

            (exCalls==0)?"overwritten by another environment":"works",

            redir_calls[indx],

            (indx==env_num)?" same ":" ",

            (env_num==0)?"first":"second");

    }

    else {

        result = STATUS_FAILED;

        NSK_COMPLAIN6(

            "\nTEST FAILED: GetVersion() interception set in the %s JVMTI env doesn't %s properly:\n"

            "\t%d interception(s) with the%s%s JVMTI env instead of %d as expected\n",

            (indx==0)?"first":"second",

            (exCalls==0)?"overwritten by another environment":"work",

            redir_calls[indx],

            (indx==env_num)?" same ":" ",

            (env_num==0)?"first":"second",

            exCalls);

        return STATUS_FAILED;

    }

    return PASSED;

}

static int initAgent(int indx) {

    jvmtiEventCallbacks callbacks; /* callback functions */

    int exitCode = PASSED;

    jvmtiError err;

    jint res;

    thrstarted[indx] = redir[indx] = redir_calls[indx] = 0;

    NSK_DISPLAY1("\nagent %s initializer: obtaining the JVMTI env ...\n", (indx==0)?"A":"B");

    res = vm->GetEnv((void **) &jvmti[indx], JVMTI_VERSION_1_1);

    if (res != JNI_OK || jvmti[indx] == NULL) {

        NSK_COMPLAIN1("TEST FAILURE: failed to call GetEnv for the agent %s\n",

            (indx==0)?"A":"B");

        result = STATUS_FAILED;

        return STATUS_FAILED;

    }

    NSK_DISPLAY1("\nagent %s initializer: the JVMTI env obtained\n\tsetting event callbacks ...\n",

        (indx==0)?"A":"B");

    (void) memset(&callbacks, 0, sizeof(callbacks));

    switch (indx) {

    case 0:

        callbacks.VMInit = &VMInitA;

        break;

    case 1:

        callbacks.VMInit = &VMInitB;

        break;

    }

        NSK_COMPLAIN1("TEST FAILURE: failed to set event callbacks: %s\n",

            TranslateError(err));

        result = STATUS_FAILED;

        return STATUS_FAILED;

    }

    NSK_DISPLAY1("\nagent %s initializer: setting event callbacks done\n\tenabling events ...\n",

        (indx==0)?"A":"B");

        NSK_COMPLAIN2("TEST FAILURE: failed to enable JVMTI_EVENT_VM_INIT event for the agent %s: %s\n",

            (indx==0)?"A":"B", TranslateError(err));

        result = STATUS_FAILED;

        return STATUS_FAILED;

    }

    NSK_DISPLAY2("\nagent %s initializer: enabling events done, returning exit code %d\n",

        (indx==0)?"A":"B", exitCode);

    return exitCode;

}

static void startAgent(int indx) {

    int tries = 0;

    NSK_DISPLAY1("\nstartAgent: starting agent %s thread ...\n",

        (indx==0)?"A":"B");

    void* context = (void*) ((indx==0)?"agent A":"agent B");

    agentThr[indx] = THREAD_new((indx==0)?agentA:agentB, context);

    if (THREAD_start(agentThr[indx]) == NULL) {

        NSK_COMPLAIN1("TEST FAILURE: cannot start the agent %s thread\n",

            (indx==0)?"A":"B");

        exit(STATUS_FAILED);

    }

    NSK_DISPLAY1("\nstartAgent: waiting for the agent %s to be started ...\n",

        (indx==0)?"A":"B");

    do {

        THREAD_sleep(1);

        tries++;

        if (tries > TRIES) {

            NSK_COMPLAIN2("TEST FAILURE: the agent %s thread is still not started after %d attempts\n",

                (indx==0)?"A":"B", TRIES);

            exit(STATUS_FAILED);

        }

    } while (thrstarted[indx] != 1);

    NSK_DISPLAY1("\nstartAgent: the agent %s thread started\n",

        (indx==0)?"A":"B");

}

/* agent thread procedures */

static int agentA(void *context) {

    JNIEnv *env;

    jint res;

    int tries = 0;

    int i;

    int exitCode = PASSED;

    NSK_DISPLAY0("\nthe agent A started\n\tattaching the thread to the VM ...\n");

        NSK_COMPLAIN1("TEST FAILURE: AttachCurrentThread() returns: %d\n", res);

        exit(STATUS_FAILED);

    }

    /* intercept the JNI function table */

    /* check the interception set in another JVMTI env */

    NSK_DISPLAY0(

        "\n>>> TEST CASE #1) First JVMTI env: checking the redirection set in the same env ...\n"

        "\nagent A (first JVMTI env): redirecting the function table ...\n");

    doRedirect(env, jvmti[0], 0);

    /* check that the interception has been set properly */

    NSK_DISPLAY0("\nagent A (first JVMTI env): checking that the interception has been set properly ...\n");

    provokeIntercept(env, "A");

    checkIntercept(0, 0, 1); /* expected interceptions: 1 */

    NSK_DISPLAY0("\n<<< TEST CASE #1) done\n");

    /* the flag set too late in order to make sure that

       the agent B will be started _after_ the interception */

    thrstarted[0] = 1;

    redir[0] = 1;

    NSK_DISPLAY0("\nagent A: waiting for the redirection in agent B ...\n");

    do {

        THREAD_sleep(1);

        tries++;

        if (tries > TRIES) {

            NSK_COMPLAIN1("TEST FAILURE: failed to wait for the redirection in agent B after %d attempts\n",

                TRIES);

            exit(STATUS_FAILED);

        }

    } while (redir[1] != 1);

    /* check the interception set in another JVMTI env */

    NSK_DISPLAY0("\n>>> TEST CASE #4) First JVMTI env: checking the redirection set in second JVMTI env ...\n");

    for (i=0; i<AGENTS; i++) {

        redir_calls[i] = 0;

    }

    provokeIntercept(env, "A");

    /* check that the previous interception has been overwritten */

    checkIntercept(0, 0, 1); /* expected interceptions: 1 */

    /* check the current interception set in another JVMTI env */

    checkIntercept(1, 0, 1); /* expected interceptions: 1 */

    NSK_DISPLAY0("\n<<< TEST CASE #4) done\n");

    NSK_DISPLAY1("\nagent A: detaching and returning exit code %d\n",

        exitCode);

        NSK_COMPLAIN1("TEST WARNING: agent A: DetachCurrentThread() returns: %d\n", res);

    }

    return exitCode;

}

static int agentB(void *context) {

    JNIEnv *env;

    jint res;

    int tries = 0;

    int i;

    int exitCode = PASSED;

    NSK_DISPLAY0("\nthe agent B started\n\tattaching the thread to the VM ...\n");

        NSK_COMPLAIN1("TEST FAILURE: AttachCurrentThread() returns: %d\n",

            res);

        exit(STATUS_FAILED);

    }

    thrstarted[1] = 1;

    NSK_DISPLAY0("\nagent B: waiting for the redirection in agent A ...\n");

    do {

        THREAD_sleep(1);

        tries++;

        if (tries > TRIES) {

            NSK_COMPLAIN1("TEST FAILURE: failed to wait for the redirection in agent A after %d attempts\n",

                TRIES);

            exit(STATUS_FAILED);

        }

    } while (redir[0] != 1);

    /* check the interception set in another JVMTI env */

    NSK_DISPLAY0("\n>>> TEST CASE #2) Second JVMTI env: checking the redirection set in first JVMTI env ...\n");

    for (i=0; i<AGENTS; i++) {

        redir_calls[i] = 0;

    }

    provokeIntercept(env, "B");

    checkIntercept(0, 1, 1); /* expected interceptions: 1 */

    NSK_DISPLAY0("\n<<< TEST CASE #2) done\n");

    /* intercept the JNI function table */

    NSK_DISPLAY0(

        "\n>>> TEST CASE #3) Second JVMTI env: checking the redirection set in the same env ...\n"

        "\nagent B (second JVMTI env): redirecting the function table ...\n");

    doRedirect(env, jvmti[1], 1);

    for (i=0; i<AGENTS; i++) {

        redir_calls[i] = 0;

    }

    provokeIntercept(env, "B");

    /* check that the previous interception has been overwritten */

    checkIntercept(0, 1, 1); /* expected interceptions: 1 */

    /* check that the current interception has been set properly */

    checkIntercept(1, 1, 1); /* expected interceptions: 1 */

    NSK_DISPLAY0("\n<<< TEST CASE #3) done\n");

    redir[1] = 1;

    NSK_DISPLAY1("\nagent B: detaching and returning exit code %d\n",

        exitCode);

        NSK_COMPLAIN1("TEST WARNING: agent B: DetachCurrentThread() returns: %d\n", res);

    }

    return exitCode;

}

/*********************/

/* callback functions */

void JNICALL

VMInitA(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {

    NSK_DISPLAY0("\nagent A: VMInit event\n");

    startAgent(0);

}

void JNICALL

VMInitB(jvmtiEnv *jvmti_env, JNIEnv *env, jthread thread) {

    NSK_DISPLAY0("\nagent B: VMInit event\n");

    startAgent(1);

}

/*********************/

JNIEXPORT jint JNICALL

Java_nsk_jvmti_scenarios_jni_1interception_JI05_ji05t001_getResult(JNIEnv *env, jobject obj) {

    int i;

    for (i=0; i<AGENTS; i++) {

        NSK_DISPLAY1("\ngetResult: waiting for the agent %s thread...\n",

            (i==0)?"A":"B");

        THREAD_waitFor(agentThr[i]);

        if (THREAD_status(agentThr[i]) != PASSED) {

            result = STATUS_FAILED;

            NSK_COMPLAIN2("TEST FAILED: the agent %s thread done with the error code %d\n",

                (i==0)?"A":"B", THREAD_status(agentThr[i]));

        }

        else NSK_DISPLAY2("getResult: the agent %s thread done with the code %d\n",

                (i==0)?"A":"B", THREAD_status(agentThr[i]));

        free(agentThr[i]);

    }

    return result;

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_ji05t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_ji05t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_ji05t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    int i;

    /* init framework and parse options */

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    vm = jvm;

    for (i=0; i<AGENTS; i++) {

        NSK_DISPLAY1("initializing agent %s ...\n",

                (i==0)?"A":"B");

        if (initAgent(i) != PASSED)

            return JNI_ERR;

    }

    return JNI_OK;

}

}