/*

 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/*

 * This source code is provided to illustrate the usage of a given feature

 * or technique and has been deliberately simplified. Additional steps

 * required for a production-quality application, such as security checks,

 * input validation and proper error handling, might not be present in

 * this sample code.

 */

/* This file contains all class, method and allocation event support functions,

 *   both JVMTI and BCI events.

 *   (See hprof_monitor.c for the monitor event handlers).

 */

#include "hprof.h"

/* Private internal functions. */

/* Return a TraceIndex for the given thread. */

static TraceIndex

get_current(TlsIndex tls_index, JNIEnv *env, jboolean skip_init)

{

    TraceIndex trace_index;

    trace_index  = tls_get_trace(tls_index, env, gdata->max_trace_depth, skip_init);

    return trace_index;

}

/* Return a ClassIndex for the given jclass, loader supplied or looked up. */

static ClassIndex

find_cnum(JNIEnv *env, jclass klass, jobject loader)

{

    LoaderIndex loader_index;

    ClassIndex  cnum;

    char *      signature;

    HPROF_ASSERT(klass!=NULL);

    /* Get the loader index */

    loader_index = loader_find_or_create(env, loader);

    /* Get the signature for this class */

    getClassSignature(klass, &signature, NULL);

    /* Find the ClassIndex for this class */

    cnum   = class_find_or_create(signature, loader_index);

    /* Free the signature space */

    jvmtiDeallocate(signature);

    /* Make sure we save a global reference to this class in the table */

    HPROF_ASSERT(cnum!=0);

    (void)class_new_classref(env, cnum, klass);

    return cnum;

}

/* Get the ClassIndex for the superClass of this jclass. */

static ClassIndex

get_super(JNIEnv *env, jclass klass)

{

    ClassIndex super_cnum;

    super_cnum  = 0;

    WITH_LOCAL_REFS(env, 1) {

        jclass  super_klass;

        super_klass = getSuperclass(env, klass);

        if ( super_klass != NULL ) {

            super_cnum = find_cnum(env, super_klass,

                                getClassLoader(super_klass));

        }

    } END_WITH_LOCAL_REFS;

    return super_cnum;

}

/* Record an allocation. Could be jobject, jclass, jarray or primitive type. */

static void

any_allocation(JNIEnv *env, SerialNumber thread_serial_num,

               TraceIndex trace_index, jobject object)

{

    SiteIndex    site_index;

    ClassIndex   cnum;

    jint         size;

    jclass       klass;

    /*    NOTE: Normally the getObjectClass() and getClassLoader()

     *          would require a

     *               WITH_LOCAL_REFS(env, 1) {

     *               } END_WITH_LOCAL_REFS;

     *          but for performance reasons we skip it here.

     */

    /* Get and tag the klass */

    klass = getObjectClass(env, object);

    cnum = find_cnum(env, klass, getClassLoader(klass));

    site_index = site_find_or_create(cnum, trace_index);

    tag_class(env, klass, cnum, thread_serial_num, site_index);

    /* Tag the object */

    size  = (jint)getObjectSize(object);

    tag_new_object(object, OBJECT_NORMAL, thread_serial_num, size, site_index);

}

/* Handle a java.lang.Object.<init> object allocation. */

void

event_object_init(JNIEnv *env, jthread thread, jobject object)

{

    /* Called via BCI Tracker class */

    /* Be very careful what is called here, watch out for recursion. */

    jint        *pstatus;

    TraceIndex   trace_index;

    SerialNumber thread_serial_num;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    HPROF_ASSERT(object!=NULL);

    /* Prevent recursion into any BCI function for this thread (pstatus). */

    if ( tls_get_tracker_status(env, thread, JNI_TRUE,

             &pstatus, NULL, &thread_serial_num, &trace_index) == 0 ) {

        (*pstatus) = 1;

        any_allocation(env, thread_serial_num, trace_index, object);

        (*pstatus) = 0;

    }

}

/* Handle any newarray opcode allocation. */

void

event_newarray(JNIEnv *env, jthread thread, jobject object)

{

    /* Called via BCI Tracker class */

    /* Be very careful what is called here, watch out for recursion. */

    jint        *pstatus;

    TraceIndex   trace_index;

    SerialNumber thread_serial_num;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    HPROF_ASSERT(object!=NULL);

    /* Prevent recursion into any BCI function for this thread (pstatus). */

    if ( tls_get_tracker_status(env, thread, JNI_FALSE,

             &pstatus, NULL, &thread_serial_num, &trace_index) == 0 ) {

        (*pstatus) = 1;

        any_allocation(env, thread_serial_num, trace_index, object);

        (*pstatus) = 0;

    }

}

/* Handle tracking of a method call. */

void

event_call(JNIEnv *env, jthread thread, ClassIndex cnum, MethodIndex mnum)

{

    /* Called via BCI Tracker class */

    /* Be very careful what is called here, watch out for recursion. */

    TlsIndex tls_index;

    jint     *pstatus;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    /* Prevent recursion into any BCI function for this thread (pstatus). */

    if ( tls_get_tracker_status(env, thread, JNI_FALSE,

             &pstatus, &tls_index, NULL, NULL) == 0 ) {

        jmethodID     method;

        (*pstatus) = 1;

        method      = class_get_methodID(env, cnum, mnum);

        (*pstatus) = 0;

    }

}

/* Handle tracking of an exception catch */

void

event_exception_catch(JNIEnv *env, jthread thread, jmethodID method,

        jlocation location, jobject exception)

{

    /* Called via JVMTI_EVENT_EXCEPTION_CATCH callback */

    /* Be very careful what is called here, watch out for recursion. */

    TlsIndex tls_index;

    jint     *pstatus;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    HPROF_ASSERT(method!=NULL);

    /* Prevent recursion into any BCI function for this thread (pstatus). */

    if ( tls_get_tracker_status(env, thread, JNI_FALSE,

             &pstatus, &tls_index, NULL, NULL) == 0 ) {

        (*pstatus) = 1;

         tls_pop_exception_catch(tls_index, thread, method);

        (*pstatus) = 0;

    }

}

/* Handle tracking of a method return pop one (maybe more) methods. */

void

event_return(JNIEnv *env, jthread thread, ClassIndex cnum, MethodIndex mnum)

{

    /* Called via BCI Tracker class */

    /* Be very careful what is called here, watch out for recursion. */

    TlsIndex tls_index;

    jint     *pstatus;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    /* Prevent recursion into any BCI function for this thread (pstatus). */

    if ( tls_get_tracker_status(env, thread, JNI_FALSE,

             &pstatus, &tls_index, NULL, NULL) == 0 ) {

        jmethodID     method;

        (*pstatus) = 1;

        method      = class_get_methodID(env, cnum, mnum);

        (*pstatus) = 0;

    }

}

/* Handle a class prepare (should have been already loaded) */

void

event_class_prepare(JNIEnv *env, jthread thread, jclass klass, jobject loader)

{

    /* Called via JVMTI_EVENT_CLASS_PREPARE event */

    ClassIndex    cnum;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    HPROF_ASSERT(klass!=NULL);

    /* Find the ClassIndex for this class */

    cnum   = find_cnum(env, klass, loader);

    class_add_status(cnum, CLASS_PREPARED);

}

/* Handle a class load (could have been already loaded) */

void

event_class_load(JNIEnv *env, jthread thread, jclass klass, jobject loader)

{

    /* Called via JVMTI_EVENT_CLASS_LOAD event or reset_class_load_status() */

    ClassIndex   cnum;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(klass!=NULL);

    /* Find the ClassIndex for this class */

    cnum   = find_cnum(env, klass, loader);

    /* Always mark it as being in the load list */

    class_add_status(cnum, CLASS_IN_LOAD_LIST);

    /* If we are seeing this as a new loaded class, extra work */

    if ( ! ( class_get_status(cnum) & CLASS_LOADED ) ) {

        TraceIndex   trace_index;

        SiteIndex    site_index;

        ClassIndex   super;

        SerialNumber class_serial_num;

        SerialNumber trace_serial_num;

        SerialNumber thread_serial_num;

        ObjectIndex  class_object_index;

        char        *signature;

        /* Get the TlsIndex and a TraceIndex for this location */

        if ( thread == NULL ) {

            /* This should be very rare, but if this class load was simulated

             *    from hprof_init.c due to a reset of the class load status,

             *    and it originated from a pre-VM_INIT event, the jthread

             *    would be NULL, or it was a jclass created that didn't get

             *    reported to us, like an array class or a primitive class?

             */

            trace_index       = gdata->system_trace_index;

            thread_serial_num = gdata->unknown_thread_serial_num;

        } else {

            TlsIndex     tls_index;

            tls_index    = tls_find_or_create(env, thread);

            trace_index  = get_current(tls_index, env, JNI_FALSE);

            thread_serial_num = tls_get_thread_serial_number(tls_index);

        }

        /* Get the SiteIndex for this location and a java.lang.Class object */

        /*    Note that the target cnum, not the cnum for java.lang.Class. */

        site_index = site_find_or_create(cnum, trace_index);

        /* Tag this java.lang.Class object */

        tag_class(env, klass, cnum, thread_serial_num, site_index);

        class_add_status(cnum, CLASS_LOADED);

        class_serial_num   = class_get_serial_number(cnum);

        class_object_index = class_get_object_index(cnum);

        trace_serial_num   = trace_get_serial_number(trace_index);

        signature          = string_get(class_get_signature(cnum));

        rawMonitorEnter(gdata->data_access_lock); {

            io_write_class_load(class_serial_num, class_object_index,

                        trace_serial_num, signature);

        } rawMonitorExit(gdata->data_access_lock);

        super  = get_super(env, klass);

        class_set_super(cnum, super);

    }

}

/* Handle a thread start event */

void

event_thread_start(JNIEnv *env, jthread thread)

{

    /* Called via JVMTI_EVENT_THREAD_START event */

    TlsIndex    tls_index;

    ObjectIndex object_index;

    TraceIndex  trace_index;

    jlong       tag;

    SerialNumber thread_serial_num;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    tls_index = tls_find_or_create(env, thread);

    thread_serial_num = tls_get_thread_serial_number(tls_index);

    trace_index = get_current(tls_index, env, JNI_FALSE);

    tag = getTag(thread);

    if ( tag == (jlong)0 ) {

        SiteIndex site_index;

        jint      size;

        size = (jint)getObjectSize(thread);

        site_index = site_find_or_create(gdata->thread_cnum, trace_index);

        /*  We create a new object with this thread's serial number */

        object_index = object_new(site_index, size, OBJECT_NORMAL,

                                              thread_serial_num);

    } else {

        object_index = tag_extract(tag);

        /* Normally the Thread object is created and tagged before we get

         *   here, but the thread_serial_number on this object isn't what

         *   we want. So we update it to the serial number of this thread.

         */

        object_set_thread_serial_number(object_index, thread_serial_num);

    }

    tls_set_thread_object_index(tls_index, object_index);

    WITH_LOCAL_REFS(env, 1) {

        jvmtiThreadInfo      threadInfo;

        jvmtiThreadGroupInfo threadGroupInfo;

        jvmtiThreadGroupInfo parentGroupInfo;

        getThreadInfo(thread, &threadInfo);

        getThreadGroupInfo(threadInfo.thread_group, &threadGroupInfo);

        if ( threadGroupInfo.parent != NULL ) {

            getThreadGroupInfo(threadGroupInfo.parent, &parentGroupInfo);

        } else {

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

        }

        rawMonitorEnter(gdata->data_access_lock); {

            io_write_thread_start(thread_serial_num,

                object_index, trace_get_serial_number(trace_index),

                threadInfo.name, threadGroupInfo.name, parentGroupInfo.name);

        } rawMonitorExit(gdata->data_access_lock);

        jvmtiDeallocate(threadInfo.name);

        jvmtiDeallocate(threadGroupInfo.name);

        jvmtiDeallocate(parentGroupInfo.name);

    } END_WITH_LOCAL_REFS;

}

void

event_thread_end(JNIEnv *env, jthread thread)

{

    /* Called via JVMTI_EVENT_THREAD_END event */

    TlsIndex     tls_index;

    HPROF_ASSERT(env!=NULL);

    HPROF_ASSERT(thread!=NULL);

    tls_index = tls_find_or_create(env, thread);

    rawMonitorEnter(gdata->data_access_lock); {

        io_write_thread_end(tls_get_thread_serial_number(tls_index));

    } rawMonitorExit(gdata->data_access_lock);

    tls_thread_ended(env, tls_index);

    setThreadLocalStorage(thread, (void*)NULL);

}