/*

 * 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 <stdlib.h>

#include <string.h>

#include "jni_tools.h"

#include "jvmti_tools.h"

#include "Injector.h"

#include "agent_common.h"

#define PASSED 0

extern "C" {

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

#define DEFAULT_MAX_NUMBER_OF_CLASSES 100

#define DEFAULT_NUMBER_OF_SAMPLES 10

#define DEFAULT_SAMPLING_INTERVAL 100

#define DEFAULT_PACKAGE_NAME "nsk/jvmti/scenarios/hotswap"

#define PROFILE_CLASS_NAME "nsk/share/jvmti/ProfileCollector"

enum {

    VM_MODE_COMPILED    = 0,

    VM_MODE_INTERPRETED = 1,

    VM_MODE_MIXED       = 2

};

/* scaffold objects */

static jlong timeout = 0;

/* test options */

static int number_of_samples;

static jlong sampling_interval;

static const char* package_name;

static size_t package_name_length;

static int vm_mode = VM_MODE_COMPILED;

static int bci_mode = BCI_MODE_EMCP;

static int sync_freq = 0;

static jclass profile_klass = NULL;

static jfieldID count_field = NULL;

/* test objects */

static int max_classes;

static char** names = NULL;

static jvmtiClassDefinition* old_class_def = NULL;

static jvmtiClassDefinition* new_class_def = NULL;

static int classCount = 0;

static int newFlag = NSK_FALSE;

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

static int redefine(jvmtiEnv* jvmti, jvmtiClassDefinition* class_def) {

    if (!NSK_VERIFY(classCount != 0))

        return NSK_FALSE;

    NSK_DISPLAY1("Redefining %d classes...\n", classCount);

    if (!NSK_JVMTI_VERIFY(jvmti->RedefineClasses(classCount, class_def)))

        return NSK_FALSE;

    return NSK_TRUE;

}

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

/** callback functions **/

static void JNICALL

ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *jni_env,

        jclass class_being_redefined, jobject loader,

        const char* name, jobject protection_domain,

        jint class_data_len, const unsigned char* class_data,

        jint *new_class_data_len, unsigned char** new_class_data) {

    jint name_len;

    if (name != NULL && classCount < max_classes &&

            class_being_redefined == NULL &&

            (strcmp(name, PROFILE_CLASS_NAME) != 0) &&

            (strncmp(name, package_name, package_name_length) == 0)) {

        NSK_DISPLAY1("ClassFileLoadHook: %s\n", name);

        name_len = (jint) strlen(name) + 1;

        if (!NSK_JVMTI_VERIFY(jvmti_env->Allocate(name_len, (unsigned char**) &names[classCount]))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        memcpy(names[classCount], name, name_len);

        if (!NSK_JVMTI_VERIFY(jvmti_env->Allocate(class_data_len, (unsigned char**)

                &old_class_def[classCount].class_bytes))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        memcpy((unsigned char*) old_class_def[classCount].class_bytes,

            class_data, class_data_len);

        old_class_def[classCount].class_byte_count = class_data_len;

        classCount++;

    }

}

static int CompiledMethodLoadEventsCount = 0;

static void JNICALL

CompiledMethodLoad(jvmtiEnv *jvmti_env, jmethodID method,

        jint code_size, const void* code_addr, jint map_length,

        const jvmtiAddrLocationMap* map, const void* compile_info) {

    char *name = NULL;

    char *signature = NULL;

    CompiledMethodLoadEventsCount++;

    if (!NSK_JVMTI_VERIFY(jvmti_env->GetMethodName(method, &name, &signature, NULL))) {

        nsk_jvmti_setFailStatus();

        return;

    }

    NSK_DISPLAY3("CompiledMethodLoad event: %s%s (0x%p)\n",

        name, signature, code_addr);

    if (name != NULL)

        jvmti_env->Deallocate((unsigned char*)name);

    if (signature != NULL)

        jvmti_env->Deallocate((unsigned char*)signature);

}

static int SingleStepEventsCount = 0;

static void JNICALL

SingleStep(jvmtiEnv *jvmti_env, JNIEnv* jni_env, jthread thread,

        jmethodID method, jlocation location) {

    SingleStepEventsCount++;

}

static int ExceptionEventsCount = 0;

static void JNICALL

Exception(jvmtiEnv *jvmti_env, JNIEnv *jni_env, jthread thread,

        jmethodID method, jlocation location, jobject exception,

        jmethodID catch_method, jlocation catch_location) {

    if (sync_freq && ((ExceptionEventsCount % sync_freq) == 0)) {

        if (nsk_getVerboseMode()) {

            jclass klass = NULL;

            char *signature = NULL;

            if (!NSK_JNI_VERIFY(jni_env, (klass = jni_env->GetObjectClass(exception)) != NULL)) {

                nsk_jvmti_setFailStatus();

                return;

            }

            if (!NSK_JVMTI_VERIFY(jvmti_env->GetClassSignature(klass, &signature, NULL))) {

                nsk_jvmti_setFailStatus();

                return;

            }

            NSK_DISPLAY2("Exception event %d: %s\n",

                ExceptionEventsCount, signature);

            if (signature != NULL)

                jvmti_env->Deallocate((unsigned char*)signature);

        }

        if (!redefine(jvmti_env, (bci_mode != BCI_MODE_EMCP && newFlag) ?

                new_class_def : old_class_def))

            nsk_jvmti_setFailStatus();

        NSK_DISPLAY1("SingleStepEventsCount: %d\n", SingleStepEventsCount);

        if (vm_mode == VM_MODE_MIXED) {

            if (!NSK_JVMTI_VERIFY(jvmti_env->SetEventNotificationMode(

                    ((newFlag) ? JVMTI_DISABLE : JVMTI_ENABLE),

                    JVMTI_EVENT_SINGLE_STEP, NULL)))

                nsk_jvmti_setFailStatus();

        }

        if (nsk_getVerboseMode() && bci_mode != BCI_MODE_EMCP) {

            jint profileCount = jni_env->GetStaticIntField(profile_klass, count_field);

            NSK_DISPLAY1("profileCount: %d\n", profileCount);

        }

        newFlag = (newFlag) ? NSK_FALSE : NSK_TRUE;

    }

    ExceptionEventsCount++;

}

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

static jrawMonitorID waitLock = NULL;

static int prepare(jvmtiEnv* jvmti, JNIEnv* jni) {

    int i;

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL)))

        return NSK_FALSE;

    if (vm_mode != VM_MODE_COMPILED) {

        if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_SINGLE_STEP, NULL)))

            return NSK_FALSE;

    }

    if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("waitLock", &waitLock)))

        return NSK_FALSE;

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

        NSK_DISPLAY1("Find class: %s\n", names[i]);

        if (!NSK_JNI_VERIFY(jni, (old_class_def[i].klass = jni->FindClass(names[i])) != NULL))

            return NSK_FALSE;

        if (!NSK_JNI_VERIFY(jni, (old_class_def[i].klass = (jclass)

                jni->NewGlobalRef(old_class_def[i].klass)) != NULL))

            return NSK_FALSE;

    }

    if (bci_mode != BCI_MODE_EMCP) {

        NSK_DISPLAY1("Find class: %s\n", PROFILE_CLASS_NAME);

        if (!NSK_JNI_VERIFY(jni, (profile_klass = jni->FindClass(PROFILE_CLASS_NAME)) != NULL))

            return NSK_FALSE;

        if (!NSK_JNI_VERIFY(jni, (profile_klass = (jclass)

                jni->NewGlobalRef(profile_klass)) != NULL))

            return NSK_FALSE;

        if (!NSK_JNI_VERIFY(jni, (count_field =

                jni->GetStaticFieldID(profile_klass,

                                      (bci_mode == BCI_MODE_CALL) ? "callCount" : "allocCount",

                                      "I")) != NULL))

            return NSK_FALSE;

        if (!NSK_JVMTI_VERIFY(jvmti->Allocate(classCount * sizeof(jvmtiClassDefinition),

                (unsigned char**) &new_class_def)))

            return NSK_FALSE;

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

            new_class_def[i].klass = old_class_def[i].klass;

            if (!Inject(old_class_def[i].class_bytes,

                    old_class_def[i].class_byte_count,

                    (unsigned char**) &new_class_def[i].class_bytes,

                    &new_class_def[i].class_byte_count, bci_mode))

                return NSK_FALSE;

        }

    }

    if (sync_freq) {

        if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_EXCEPTION, NULL)))

            return NSK_FALSE;

    }

    return NSK_TRUE;

}

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

static int wait_for(jvmtiEnv* jvmti, jlong millis) {

    if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(waitLock)))

        return NSK_FALSE;

    if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorWait(waitLock, millis)))

        nsk_jvmti_setFailStatus();

    if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(waitLock)))

        return NSK_FALSE;

    return NSK_TRUE;

}

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

/** Agent algorithm. */

static void JNICALL

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

    int i;

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!prepare(jvmti, jni)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* resume debugee and wait for sync */

    if (!nsk_jvmti_resumeSync())

        return;

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (sync_freq) {

        if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_EXCEPTION, NULL)))

            nsk_jvmti_setFailStatus();

    } else {

        for (i = 0; i < number_of_samples && !nsk_jvmti_isFailStatus(); i++) {

            wait_for(jvmti, sampling_interval);

            if (!redefine(jvmti, (bci_mode != BCI_MODE_EMCP && newFlag) ?

                    new_class_def : old_class_def))

                nsk_jvmti_setFailStatus();

            NSK_DISPLAY1("SingleStepEventsCount: %d\n", SingleStepEventsCount);

            if (vm_mode == VM_MODE_MIXED) {

                if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(

                        (((i % 2) == 0) ? JVMTI_DISABLE : JVMTI_ENABLE),

                        JVMTI_EVENT_SINGLE_STEP, NULL)))

                    nsk_jvmti_setFailStatus();

            }

            if (nsk_getVerboseMode() && bci_mode != BCI_MODE_EMCP) {

                jint profileCount = jni->GetStaticIntField(profile_klass, count_field);

                NSK_DISPLAY1("profileCount: %d\n", profileCount);

            }

            newFlag = (newFlag) ? NSK_FALSE : NSK_TRUE;

        }

    }

    if (vm_mode != VM_MODE_COMPILED) {

        if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_SINGLE_STEP, NULL)))

            nsk_jvmti_setFailStatus();

    }

    if (!nsk_jvmti_resumeSync())

        return;

}

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

/** Agent library initialization. */

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

    jvmtiEnv* jvmti = NULL;

    jvmtiCapabilities caps;

    jvmtiEventCallbacks callbacks;

    const char* optValue;

    NSK_DISPLAY0("Agent_OnLoad\n");

    /* init framework and parse options */

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60 * 1000;

    /* get options */

    number_of_samples = nsk_jvmti_findOptionIntValue("samples",

        DEFAULT_NUMBER_OF_SAMPLES);

    if (!NSK_VERIFY(number_of_samples > 0))

        return JNI_ERR;

    NSK_DISPLAY1("samples: %d\n", number_of_samples);

    sampling_interval = nsk_jvmti_findOptionIntValue("interval",

        DEFAULT_SAMPLING_INTERVAL);

    if (!NSK_VERIFY(sampling_interval > 0))

        return JNI_ERR;

    NSK_DISPLAY1("interval: %d\n", sampling_interval);

    package_name = nsk_jvmti_findOptionStringValue("package",

        DEFAULT_PACKAGE_NAME);

    if (!NSK_VERIFY(package_name != NULL))

        return JNI_ERR;

    NSK_DISPLAY1("package: %s\n", package_name);

    package_name_length = strlen(package_name);

    if (!NSK_VERIFY(package_name_length > 0))

        return JNI_ERR;

    max_classes = nsk_jvmti_findOptionIntValue("classes",

        DEFAULT_MAX_NUMBER_OF_CLASSES);

    if (!NSK_VERIFY(max_classes > 0))

        return JNI_ERR;

    NSK_DISPLAY1("classes: %d\n", max_classes);

    optValue = nsk_jvmti_findOptionValue("mode");

    if (optValue != NULL) {

        if (strcmp(optValue, "compiled") == 0)

            vm_mode = VM_MODE_COMPILED;

        else if (strcmp(optValue, "interpreted") == 0)

            vm_mode = VM_MODE_INTERPRETED;

        else if (strcmp(optValue, "mixed") == 0)

            vm_mode = VM_MODE_MIXED;

        else {

            NSK_COMPLAIN1("Unknown option value: mode=%s\n", optValue);

            return JNI_ERR;

        }

    }

    optValue = nsk_jvmti_findOptionValue("bci");

    if (optValue != NULL) {

        if (strcmp(optValue, "emcp") == 0)

            bci_mode = BCI_MODE_EMCP;

        else if (strcmp(optValue, "call") == 0)

            bci_mode = BCI_MODE_CALL;

        else if (strcmp(optValue, "alloc") == 0)

            bci_mode = BCI_MODE_ALLOC;

        else {

            NSK_COMPLAIN1("Unknown option value: bci=%s\n", optValue);

            return JNI_ERR;

        }

    }

    sync_freq = nsk_jvmti_findOptionIntValue("sync", 0);

    if (!NSK_VERIFY(sync_freq >= 0))

        return JNI_ERR;

    NSK_DISPLAY1("sync: %d\n", sync_freq);

    /* create JVMTI environment */

    if (!NSK_VERIFY((jvmti =

            nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))

        return JNI_ERR;

    /* allocate tables for classes */

    if (!NSK_JVMTI_VERIFY(jvmti->Allocate(max_classes * sizeof(char*), (unsigned char**) &names)))

        return JNI_ERR;

    if (!NSK_JVMTI_VERIFY(jvmti->Allocate(max_classes * sizeof(jvmtiClassDefinition),

            (unsigned char**) &old_class_def)))

        return JNI_ERR;

    /* add capabilities */

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

    caps.can_redefine_classes = 1;

    caps.can_generate_compiled_method_load_events = 1;

    if (vm_mode != VM_MODE_COMPILED) {

        caps.can_generate_single_step_events = 1;

    }

    if (sync_freq) {

        caps.can_generate_exception_events = 1;

    }

    if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps)))

        return JNI_ERR;

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

        return JNI_ERR;

    /* set event callbacks */

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

    callbacks.ClassFileLoadHook = &ClassFileLoadHook;

    callbacks.CompiledMethodLoad = &CompiledMethodLoad;

    if (vm_mode != VM_MODE_COMPILED) {

        callbacks.SingleStep = &SingleStep;

    }

    if (sync_freq) {

        callbacks.Exception = &Exception;

    }

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks))))

        return JNI_ERR;

    /* enable events */

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL)))

        return JNI_ERR;

    if (!NSK_JVMTI_VERIFY(jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_COMPILED_METHOD_LOAD, NULL)))

        return JNI_ERR;

    return JNI_OK;

}

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

}