gcc/liboffloadmic/runtime/offload_host.cpp

/*
    Copyright (c) 2014 Intel Corporation.  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 Intel Corporation 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
    HOLDER 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.
*/


// Forward declaration as the following 2 functions are declared as friend in offload_engine.h
// CLANG does not like static to been after friend declaration.
static void __offload_init_library_once(void);
static void __offload_fini_library(void);

#include "offload_host.h"
#ifdef MYO_SUPPORT
#include "offload_myo_host.h"
#endif

#include <malloc.h>
#ifndef TARGET_WINNT
#include <alloca.h>
#include <elf.h>
#endif // TARGET_WINNT
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <algorithm>
#include <bitset>

#if defined(HOST_WINNT)
#define PATH_SEPARATOR ";"
#else
#define PATH_SEPARATOR ":"
#endif

#define GET_OFFLOAD_NUMBER(timer_data) \
    timer_data? timer_data->offload_number : 0

#ifdef TARGET_WINNT
// Small subset of ELF declarations for Windows which is needed to compile
// this file. ELF header is used to understand what binary type is contained
// in the target image - shared library or executable.

typedef uint16_t Elf64_Half;
typedef uint32_t Elf64_Word;
typedef uint64_t Elf64_Addr;
typedef uint64_t Elf64_Off;

#define EI_NIDENT   16

#define ET_EXEC     2
#define ET_DYN      3

typedef struct
{
    unsigned char e_ident[EI_NIDENT];
    Elf64_Half    e_type;
    Elf64_Half    e_machine;
    Elf64_Word    e_version;
    Elf64_Addr    e_entry;
    Elf64_Off     e_phoff;
    Elf64_Off     e_shoff;
    Elf64_Word    e_flags;
    Elf64_Half    e_ehsize;
    Elf64_Half    e_phentsize;
    Elf64_Half    e_phnum;
    Elf64_Half    e_shentsize;
    Elf64_Half    e_shnum;
    Elf64_Half    e_shstrndx;
} Elf64_Ehdr;
#endif // TARGET_WINNT

// Host console and file logging
const char *prefix;
int console_enabled = 0;
int offload_number = 0;

static const char *htrace_envname = "H_TRACE";
static const char *offload_report_envname = "OFFLOAD_REPORT";
static char *timer_envname = "H_TIME";

// Trace information
static const char* vardesc_direction_as_string[] = {
    "NOCOPY",
    "IN",
    "OUT",
    "INOUT"
};
static const char* vardesc_type_as_string[] = {
    "unknown",
    "data",
    "data_ptr",
    "func_ptr",
    "void_ptr",
    "string_ptr",
    "dv",
    "dv_data",
    "dv_data_slice",
    "dv_ptr",
    "dv_ptr_data",
    "dv_ptr_data_slice",
    "cean_var",
    "cean_var_ptr",
    "c_data_ptr_array",
    "c_func_ptr_array",
    "c_void_ptr_array",
    "c_string_ptr_array"
};

Engine*         mic_engines = 0;
uint32_t        mic_engines_total = 0;
pthread_key_t   mic_thread_key;
MicEnvVar       mic_env_vars;
uint64_t        cpu_frequency = 0;

// MIC_STACKSIZE
uint32_t mic_stack_size = 12 * 1024 * 1024;

// MIC_BUFFERSIZE
uint64_t mic_buffer_size = 0;

// MIC_LD_LIBRARY_PATH
char* mic_library_path = 0;

// MIC_PROXY_IO
bool mic_proxy_io = true;

// MIC_PROXY_FS_ROOT
char* mic_proxy_fs_root = 0;

// Threshold for creating buffers with large pages. Buffer is created
// with large pages hint if its size exceeds the threshold value.
// By default large pages are disabled right now (by setting default
// value for threshold to MAX) due to HSD 4114629.
uint64_t __offload_use_2mb_buffers = 0xffffffffffffffffULL;
static const char *mic_use_2mb_buffers_envname  =
    "MIC_USE_2MB_BUFFERS";

static uint64_t __offload_use_async_buffer_write = 2 * 1024 * 1024;
static const char *mic_use_async_buffer_write_envname  =
    "MIC_USE_ASYNC_BUFFER_WRITE";

static uint64_t __offload_use_async_buffer_read = 2 * 1024 * 1024;
static const char *mic_use_async_buffer_read_envname  =
    "MIC_USE_ASYNC_BUFFER_READ";

// device initialization type
OffloadInitType __offload_init_type = c_init_on_offload_all;
static const char *offload_init_envname = "OFFLOAD_INIT";

// active wait
static bool __offload_active_wait = true;
static const char *offload_active_wait_envname = "OFFLOAD_ACTIVE_WAIT";

// OMP_DEFAULT_DEVICE
int __omp_device_num = 0;
static const char *omp_device_num_envname = "OMP_DEFAULT_DEVICE";

// The list of pending target libraries
static bool            __target_libs;
static TargetImageList __target_libs_list;
static mutex_t         __target_libs_lock;
static mutex_t         stack_alloc_lock;

// Target executable
TargetImage*           __target_exe;

static char * offload_get_src_base(void * ptr, uint8_t type)
{
    char *base;
    if (VAR_TYPE_IS_PTR(type)) {
        base = *static_cast<char**>(ptr);
    }
    else if (VAR_TYPE_IS_SCALAR(type)) {
        base = static_cast<char*>(ptr);
    }
    else if (VAR_TYPE_IS_DV_DATA_SLICE(type) || VAR_TYPE_IS_DV_DATA(type)) {
        ArrDesc *dvp;
        if (VAR_TYPE_IS_DV_DATA_SLICE(type)) {
            const arr_desc *ap = static_cast<const arr_desc*>(ptr);
            dvp = (type == c_dv_data_slice) ?
                  reinterpret_cast<ArrDesc*>(ap->base) :
                  *reinterpret_cast<ArrDesc**>(ap->base);
        }
        else {
            dvp = (type == c_dv_data) ?
                  static_cast<ArrDesc*>(ptr) :
                  *static_cast<ArrDesc**>(ptr);
        }
        base = reinterpret_cast<char*>(dvp->Base);
    }
    else {
        base = NULL;
    }
    return base;
}

void OffloadDescriptor::report_coi_error(error_types msg, COIRESULT res)
{
    // special case for the 'process died' error
    if (res == COI_PROCESS_DIED) {
        m_device.fini_process(true);
    }
    else {
        switch (msg) {
            case c_buf_create:
                if (res == COI_OUT_OF_MEMORY) {
                    msg = c_buf_create_out_of_mem;
                }
                /* fallthru */

            case c_buf_create_from_mem:
            case c_buf_get_address:
            case c_pipeline_create:
            case c_pipeline_run_func:
                LIBOFFLOAD_ERROR(msg, m_device.get_logical_index(), res);
                break;

            case c_buf_read:
            case c_buf_write:
            case c_buf_copy:
            case c_buf_map:
            case c_buf_unmap:
            case c_buf_destroy:
            case c_buf_set_state:
                LIBOFFLOAD_ERROR(msg, res);
                break;

            default:
                break;
        }
    }

    exit(1);
}

_Offload_result OffloadDescriptor::translate_coi_error(COIRESULT res) const
{
    switch (res) {
        case COI_SUCCESS:
            return OFFLOAD_SUCCESS;

        case COI_PROCESS_DIED:
            return OFFLOAD_PROCESS_DIED;

        case COI_OUT_OF_MEMORY:
            return OFFLOAD_OUT_OF_MEMORY;

        default:
            return OFFLOAD_ERROR;
    }
}

bool OffloadDescriptor::alloc_ptr_data(
    PtrData* &ptr_data,
    void *base,
    int64_t disp,
    int64_t size,
    int64_t alloc_disp,
    int align
)
{
    // total length of base
    int64_t length = disp + size;
    bool is_new;

    OFFLOAD_TRACE(3, "Creating association for data: addr %p, length %lld\n",
                  base, length);

    // add new entry
    ptr_data = m_device.insert_ptr_data(base, length, is_new);
    if (is_new) {

        OFFLOAD_TRACE(3, "Added new association\n");

        if (length > 0) {
            OffloadTimer timer(get_timer_data(), c_offload_host_alloc_buffers);
            COIRESULT res;

            // align should be a power of 2
            if (align > 0 && (align & (align - 1)) == 0) {
                // offset within mic_buffer. Can do offset optimization
                // only when source address alignment satisfies requested
                // alignment on the target (cq172736).
                if ((reinterpret_cast<intptr_t>(base) & (align - 1)) == 0) {
                    ptr_data->mic_offset = reinterpret_cast<intptr_t>(base) & 4095;
                }
            }

            // buffer size and flags
            uint64_t buffer_size = length + ptr_data->mic_offset;
            uint32_t buffer_flags = 0;

            // create buffer with large pages if data length exceeds
            // large page threshold
            if (length >= __offload_use_2mb_buffers) {
                buffer_flags = COI_OPTIMIZE_HUGE_PAGE_SIZE;
            }

            // create CPU buffer
            OFFLOAD_DEBUG_TRACE_1(3,
                          GET_OFFLOAD_NUMBER(get_timer_data()),
                          c_offload_create_buf_host,
                          "Creating buffer from source memory %p, "
                          "length %lld\n", base, length);

            // result is not checked because we can continue without cpu
            // buffer. In this case we will use COIBufferRead/Write instead
            // of COIBufferCopy.
            COI::BufferCreateFromMemory(length,
                                        COI_BUFFER_NORMAL,
                                        0,
                                        base,
                                        1,
                                        &m_device.get_process(),
                                        &ptr_data->cpu_buf);

            OFFLOAD_DEBUG_TRACE_1(3,
                          GET_OFFLOAD_NUMBER(get_timer_data()),
                          c_offload_create_buf_mic,
                          "Creating buffer for sink: size %lld, offset %d, "
                          "flags =0x%x\n", buffer_size - alloc_disp,
                          ptr_data->mic_offset, buffer_flags);

            // create MIC buffer
            res = COI::BufferCreate(buffer_size - alloc_disp,
                                    COI_BUFFER_NORMAL,
                                    buffer_flags,
                                    0,
                                    1,
                                    &m_device.get_process(),
                                    &ptr_data->mic_buf);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                }
                else if (m_is_mandatory) {
                    report_coi_error(c_buf_create, res);
                }
                ptr_data->alloc_ptr_data_lock.unlock();
                return false;
            }

            // make buffer valid on the device.
            res = COI::BufferSetState(ptr_data->mic_buf,
                                      m_device.get_process(),
                                      COI_BUFFER_VALID,
                                      COI_BUFFER_NO_MOVE,
                                      0, 0, 0);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                }
                else if (m_is_mandatory) {
                    report_coi_error(c_buf_set_state, res);
                }
                ptr_data->alloc_ptr_data_lock.unlock();
                return false;
            }

            res = COI::BufferSetState(ptr_data->mic_buf,
                                      COI_PROCESS_SOURCE,
                                      COI_BUFFER_INVALID,
                                      COI_BUFFER_NO_MOVE,
                                      0, 0, 0);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                }
                else if (m_is_mandatory) {
                    report_coi_error(c_buf_set_state, res);
                }
                ptr_data->alloc_ptr_data_lock.unlock();
                return false;
            }
        }

        ptr_data->alloc_disp = alloc_disp;
        ptr_data->alloc_ptr_data_lock.unlock();
    }
    else {
        mutex_locker_t locker(ptr_data->alloc_ptr_data_lock);

        OFFLOAD_TRACE(3, "Found existing association: addr %p, length %lld, "
                      "is_static %d\n",
                      ptr_data->cpu_addr.start(), ptr_data->cpu_addr.length(),
                      ptr_data->is_static);

        // This is not a new entry. Make sure that provided address range fits
        // into existing one.
        MemRange addr_range(base, length - ptr_data->alloc_disp);
        if (!ptr_data->cpu_addr.contains(addr_range)) {
            LIBOFFLOAD_ERROR(c_bad_ptr_mem_range);
            exit(1);
        }

        // if the entry is associated with static data it may not have buffers
        // created because they are created on demand.
        if (ptr_data->is_static && !init_static_ptr_data(ptr_data)) {
            return false;
        }
    }

    return true;
}

bool OffloadDescriptor::find_ptr_data(
    PtrData* &ptr_data,
    void *base,
    int64_t disp,
    int64_t size,
    bool report_error
)
{
    // total length of base
    int64_t length = disp + size;

    OFFLOAD_TRACE(3, "Looking for association for data: addr %p, "
                  "length %lld\n", base, length);

    // find existing association in pointer table
    ptr_data = m_device.find_ptr_data(base);
    if (ptr_data == 0) {
        if (report_error) {
            LIBOFFLOAD_ERROR(c_no_ptr_data, base);
            exit(1);
        }
        OFFLOAD_TRACE(3, "Association does not exist\n");
        return true;
    }

    OFFLOAD_TRACE(3, "Found association: base %p, length %lld, is_static %d\n",
                  ptr_data->cpu_addr.start(), ptr_data->cpu_addr.length(),
                  ptr_data->is_static);

    // make sure that provided address range fits into existing one
    MemRange addr_range(base, length);
    if (!ptr_data->cpu_addr.contains(addr_range)) {
        if (report_error) {
            LIBOFFLOAD_ERROR(c_bad_ptr_mem_range);
            exit(1);
        }
        OFFLOAD_TRACE(3, "Existing association partially overlaps with "
                      "data address range\n");
        ptr_data = 0;
        return true;
    }

    // if the entry is associated with static data it may not have buffers
    // created because they are created on demand.
    if (ptr_data->is_static && !init_static_ptr_data(ptr_data)) {
        return false;
    }

    return true;
}

bool OffloadDescriptor::init_static_ptr_data(PtrData *ptr_data)
{
    OffloadTimer timer(get_timer_data(), c_offload_host_alloc_buffers);

    if (ptr_data->cpu_buf == 0) {
        OFFLOAD_TRACE(3, "Creating buffer from source memory %llx\n",
                      ptr_data->cpu_addr.start());

        COIRESULT res = COI::BufferCreateFromMemory(
            ptr_data->cpu_addr.length(),
            COI_BUFFER_NORMAL,
            0,
            const_cast<void*>(ptr_data->cpu_addr.start()),
            1, &m_device.get_process(),
            &ptr_data->cpu_buf);

        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
                return false;
            }
            report_coi_error(c_buf_create_from_mem, res);
        }
    }

    if (ptr_data->mic_buf == 0) {
        OFFLOAD_TRACE(3, "Creating buffer from sink memory %llx\n",
                      ptr_data->mic_addr);

        COIRESULT res = COI::BufferCreateFromMemory(
            ptr_data->cpu_addr.length(),
            COI_BUFFER_NORMAL,
            COI_SINK_MEMORY,
            reinterpret_cast<void*>(ptr_data->mic_addr),
            1, &m_device.get_process(),
            &ptr_data->mic_buf);

        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
                return false;
            }
            report_coi_error(c_buf_create_from_mem, res);
        }
    }

    return true;
}

bool OffloadDescriptor::init_mic_address(PtrData *ptr_data)
{
    if (ptr_data->mic_buf != 0 && ptr_data->mic_addr == 0) {
        COIRESULT res = COI::BufferGetSinkAddress(ptr_data->mic_buf,
                                                  &ptr_data->mic_addr);
        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
            }
            else if (m_is_mandatory) {
                report_coi_error(c_buf_get_address, res);
            }
            return false;
        }
    }
    return true;
}

bool OffloadDescriptor::nullify_target_stack(
    COIBUFFER targ_buf,
    uint64_t size
)
{
    char * ptr = (char*)malloc(size);
    if (ptr == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    COIRESULT res;

    memset(ptr, 0, size);
    res = COI::BufferWrite(
        targ_buf,
        0,
        ptr,
        size,
        COI_COPY_UNSPECIFIED,
        0, 0, 0);
    free(ptr);
    if (res != COI_SUCCESS) {
        if (m_status != 0) {
            m_status->result = translate_coi_error(res);
            return false;
        }
        report_coi_error(c_buf_write, res);
    }
    return true;
}

bool OffloadDescriptor::offload_stack_memory_manager(
    const void * stack_begin,
    int  routine_id,
    int  buf_size,
    int  align,
    bool *is_new)
{
    mutex_locker_t locker(stack_alloc_lock);

    PersistData * new_el;
    PersistDataList::iterator it_begin = m_device.m_persist_list.begin();
    PersistDataList::iterator it_end;
    int erase = 0;

    *is_new = false;

    for (PersistDataList::iterator it = m_device.m_persist_list.begin();
        it != m_device.m_persist_list.end(); it++) {
        PersistData cur_el = *it;

        if (stack_begin > it->stack_cpu_addr) {
            // this stack data must be destroyed
            m_destroy_stack.push_front(cur_el.stack_ptr_data);
            it_end = it;
            erase++;
        }
        else if (stack_begin == it->stack_cpu_addr) {
            if (routine_id != it-> routine_id) {
                // this stack data must be destroyed
                m_destroy_stack.push_front(cur_el.stack_ptr_data);
                it_end = it;
                erase++;
                break;
            }
            else {
                // stack data is reused
                m_stack_ptr_data = it->stack_ptr_data;
                if (erase > 0) {
                    // all obsolete stack sections must be erased from the list
                    m_device.m_persist_list.erase(it_begin, ++it_end);

                    m_in_datalen +=
                        erase * sizeof(new_el->stack_ptr_data->mic_addr);
                }
                OFFLOAD_TRACE(3, "Reuse of stack buffer with addr %p\n",
                                 m_stack_ptr_data->mic_addr);
                return true;
            }
        }
        else if (stack_begin < it->stack_cpu_addr) {
            break;
        }
    }

    if (erase > 0) {
        // all obsolete stack sections must be erased from the list
        m_device.m_persist_list.erase(it_begin, ++it_end);
        m_in_datalen += erase * sizeof(new_el->stack_ptr_data->mic_addr);
    }
    // new stack table is created
    new_el = new PersistData(stack_begin, routine_id, buf_size);
    // create MIC buffer
    COIRESULT res;
    uint32_t buffer_flags = 0;

    // create buffer with large pages if data length exceeds
    // large page threshold
    if (buf_size >= __offload_use_2mb_buffers) {
        buffer_flags = COI_OPTIMIZE_HUGE_PAGE_SIZE;
    }
    res = COI::BufferCreate(buf_size,
        COI_BUFFER_NORMAL,
        buffer_flags,
        0,
        1,
        &m_device.get_process(),
        &new_el->stack_ptr_data->mic_buf);
    if (res != COI_SUCCESS) {
        if (m_status != 0) {
            m_status->result = translate_coi_error(res);
        }
        else if (m_is_mandatory) {
            report_coi_error(c_buf_create, res);
        }
        return false;
    }
    // make buffer valid on the device.
    res = COI::BufferSetState(new_el->stack_ptr_data->mic_buf,
        m_device.get_process(),
        COI_BUFFER_VALID,
        COI_BUFFER_NO_MOVE,
        0, 0, 0);
    if (res != COI_SUCCESS) {
        if (m_status != 0) {
            m_status->result = translate_coi_error(res);
        }
        else if (m_is_mandatory) {
            report_coi_error(c_buf_set_state, res);
        }
        return false;
    }
    res = COI::BufferSetState(new_el->stack_ptr_data->mic_buf,
        COI_PROCESS_SOURCE,
        COI_BUFFER_INVALID,
        COI_BUFFER_NO_MOVE,
        0, 0, 0);
    if (res != COI_SUCCESS) {
        if (m_status != 0) {
            m_status->result = translate_coi_error(res);
        }
        else if (m_is_mandatory) {
            report_coi_error(c_buf_set_state, res);
        }
        return false;
    }
    // persistence algorithm requires target stack initialy to be nullified
    if (!nullify_target_stack(new_el->stack_ptr_data->mic_buf, buf_size)) {
        return false;
    }

    m_stack_ptr_data = new_el->stack_ptr_data;
    init_mic_address(m_stack_ptr_data);
    OFFLOAD_TRACE(3, "Allocating stack buffer with addr %p\n",
                      m_stack_ptr_data->mic_addr);
    m_device.m_persist_list.push_front(*new_el);
    init_mic_address(new_el->stack_ptr_data);
    *is_new = true;
    return true;
}

bool OffloadDescriptor::setup_descriptors(
    VarDesc *vars,
    VarDesc2 *vars2,
    int vars_total,
    int entry_id,
    const void *stack_addr
)
{
    COIRESULT res;

    OffloadTimer timer(get_timer_data(), c_offload_host_setup_buffers);

    // make a copy of variable descriptors
    m_vars_total = vars_total;
    if (vars_total > 0) {
        m_vars = (VarDesc*) malloc(m_vars_total * sizeof(VarDesc));
        if (m_vars == NULL)
          LIBOFFLOAD_ERROR(c_malloc);
        memcpy(m_vars, vars, m_vars_total * sizeof(VarDesc));
        m_vars_extra = (VarExtra*) malloc(m_vars_total * sizeof(VarExtra));
        if (m_vars_extra == NULL)
          LIBOFFLOAD_ERROR(c_malloc);
    }

    // dependencies
    m_in_deps = (COIEVENT*) malloc(sizeof(COIEVENT) * (m_vars_total  + 1));
    if (m_in_deps == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    if (m_vars_total > 0) {
        m_out_deps = (COIEVENT*) malloc(sizeof(COIEVENT) * m_vars_total);
        if (m_out_deps == NULL)
          LIBOFFLOAD_ERROR(c_malloc);
    }

    // copyin/copyout data length
    m_in_datalen = 0;
    m_out_datalen = 0;

    // First pass over variable descriptors
    // - Calculate size of the input and output non-pointer data
    // - Allocate buffers for input and output pointers
    for (int i = 0; i < m_vars_total; i++) {
        void*   alloc_base = NULL;
        int64_t alloc_disp = 0;
        int64_t alloc_size;
        bool    src_is_for_mic = (m_vars[i].direction.out ||
                                  m_vars[i].into == NULL);

        const char *var_sname = "";
        if (vars2 != NULL && i < vars_total) {
            if (vars2[i].sname != NULL) {
                var_sname = vars2[i].sname;
            }
        }
        OFFLOAD_TRACE(2, "   VarDesc %d, var=%s, %s, %s\n",
            i, var_sname,
            vardesc_direction_as_string[m_vars[i].direction.bits],
            vardesc_type_as_string[m_vars[i].type.src]);
        if (vars2 != NULL && i < vars_total && vars2[i].dname != NULL) {
            OFFLOAD_TRACE(2, "              into=%s, %s\n", vars2[i].dname,
                vardesc_type_as_string[m_vars[i].type.dst]);
        }
        OFFLOAD_TRACE(2,
            "              type_src=%d, type_dstn=%d, direction=%d, "
            "alloc_if=%d, free_if=%d, align=%d, mic_offset=%d, flags=0x%x, "
            "offset=%lld, size=%lld, count/disp=%lld, ptr=%p, into=%p\n",
            m_vars[i].type.src,
            m_vars[i].type.dst,
            m_vars[i].direction.bits,
            m_vars[i].alloc_if,
            m_vars[i].free_if,
            m_vars[i].align,
            m_vars[i].mic_offset,
            m_vars[i].flags.bits,
            m_vars[i].offset,
            m_vars[i].size,
            m_vars[i].count,
            m_vars[i].ptr,
            m_vars[i].into);

        if (m_vars[i].alloc != NULL) {
            // array descriptor
            const arr_desc *ap =
                static_cast<const arr_desc*>(m_vars[i].alloc);

            // debug dump
            __arr_desc_dump("    ", "ALLOC", ap, 0);

            __arr_data_offset_and_length(ap, alloc_disp, alloc_size);

            alloc_base = reinterpret_cast<void*>(ap->base);
        }

        m_vars_extra[i].cpu_disp = 0;
        m_vars_extra[i].cpu_offset = 0;
        m_vars_extra[i].src_data = 0;
        m_vars_extra[i].read_rng_src = 0;
        m_vars_extra[i].read_rng_dst = 0;
        // flag is_arr_ptr_el is 1 only for var_descs generated
        // for c_data_ptr_array type
        if (i < vars_total) {
            m_vars_extra[i].is_arr_ptr_el = 0;
        }

        switch (m_vars[i].type.src) {
            case c_data_ptr_array:
                {
                    const arr_desc *ap;
                    const VarDesc3 *vd3 =
                        static_cast<const VarDesc3*>(m_vars[i].ptr);
                    int flags = vd3->array_fields;
                    OFFLOAD_TRACE(2,
                        "              pointer array flags = %04x\n", flags);
                    OFFLOAD_TRACE(2,
                        "              pointer array type is %s\n",
                        vardesc_type_as_string[flags & 0x3f]);
                    ap = static_cast<const arr_desc*>(vd3->ptr_array);
                    __arr_desc_dump("              ", "ptr array", ap, 0);
                    if (m_vars[i].into) {
                        ap = static_cast<const arr_desc*>(m_vars[i].into);
                        __arr_desc_dump(
                            "              ", "into array", ap, 0);
                    }
                    if ((flags & (1<<flag_align_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->align_array);
                        __arr_desc_dump(
                            "              ", "align array", ap, 0);
                    }
                    if ((flags & (1<<flag_alloc_if_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->alloc_if_array);
                        __arr_desc_dump(
                            "              ", "alloc_if array", ap, 0);
                    }
                    if ((flags & (1<<flag_free_if_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->free_if_array);
                        __arr_desc_dump(
                            "              ", "free_if array", ap, 0);
                    }
                    if ((flags & (1<<flag_extent_start_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->extent_start);
                        __arr_desc_dump(
                            "              ", "extent_start array", ap, 0);
                    } else if ((flags &
                        (1<<flag_extent_start_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              extent_start scalar = %d\n",
                            (int64_t)vd3->extent_start);
                    }
                    if ((flags & (1<<flag_extent_elements_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>
                            (vd3->extent_elements);
                        __arr_desc_dump(
                            "              ", "extent_elements array", ap, 0);
                    } else if ((flags &
                        (1<<flag_extent_elements_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              extent_elements scalar = %d\n",
                            (int64_t)vd3->extent_elements);
                    }
                    if ((flags & (1<<flag_into_start_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->into_start);
                        __arr_desc_dump(
                            "              ", "into_start array", ap, 0);
                    } else if ((flags &
                        (1<<flag_into_start_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              into_start scalar = %d\n",
                            (int64_t)vd3->into_start);
                    }
                    if ((flags & (1<<flag_into_elements_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->into_elements);
                        __arr_desc_dump(
                            "              ", "into_elements array", ap, 0);
                    } else if ((flags &
                        (1<<flag_into_elements_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              into_elements scalar = %d\n",
                            (int64_t)vd3->into_elements);
                    }
                    if ((flags & (1<<flag_alloc_start_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->alloc_start);
                        __arr_desc_dump(
                            "              ", "alloc_start array", ap, 0);
                    } else if ((flags &
                        (1<<flag_alloc_start_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              alloc_start scalar = %d\n",
                            (int64_t)vd3->alloc_start);
                    }
                    if ((flags & (1<<flag_alloc_elements_is_array)) != 0) {
                        ap = static_cast<const arr_desc*>(vd3->alloc_elements);
                        __arr_desc_dump(
                            "              ", "alloc_elements array", ap, 0);
                    } else if ((flags &
                        (1<<flag_alloc_elements_is_scalar)) != 0) {
                        OFFLOAD_TRACE(2,
                            "              alloc_elements scalar = %d\n",
                            (int64_t)vd3->alloc_elements);
                    }
                }
                if (!gen_var_descs_for_pointer_array(i)) {
                    return false;
                }
                break;

            case c_data:
            case c_void_ptr:
            case c_cean_var:
                // In all uses later
                // VarDesc.size will have the length of the data to be
                // transferred
                // VarDesc.disp will have an offset from base
                if (m_vars[i].type.src == c_cean_var) {
                    // array descriptor
                    const arr_desc *ap =
                        static_cast<const arr_desc*>(m_vars[i].ptr);

                    // debug dump
                    __arr_desc_dump("", "IN/OUT", ap, 0);

                    // offset and length are derived from the array descriptor
                    __arr_data_offset_and_length(ap, m_vars[i].disp,
                                                 m_vars[i].size);
                    if (!is_arr_desc_contiguous(ap)) {
                        m_vars[i].flags.is_noncont_src = 1;
                        m_vars_extra[i].read_rng_src =
                            init_read_ranges_arr_desc(ap);
                    }
                    // all necessary information about length and offset is
                    // transferred in var descriptor. There is no need to send
                    // array descriptor to the target side.
                    m_vars[i].ptr = reinterpret_cast<void*>(ap->base);
                }
                else {
                    m_vars[i].size *= m_vars[i].count;
                    m_vars[i].disp = 0;
                }

                if (m_vars[i].direction.bits) {
                    // make sure that transfer size > 0
                    if (m_vars[i].size <= 0) {
                        LIBOFFLOAD_ERROR(c_zero_or_neg_transfer_size);
                        exit(1);
                    }

                    if (m_vars[i].flags.is_static) {
                        PtrData *ptr_data;

                        // find data associated with variable
                        if (!find_ptr_data(ptr_data,
                                           m_vars[i].ptr,
                                           m_vars[i].disp,
                                           m_vars[i].size,
                                           false)) {
                            return false;
                        }

                        if (ptr_data != 0) {
                            // offset to base from the beginning of the buffer
                            // memory
                            m_vars[i].offset =
                                (char*) m_vars[i].ptr -
                                (char*) ptr_data->cpu_addr.start();
                        }
                        else {
                            m_vars[i].flags.is_static = false;
                            if (m_vars[i].into == NULL) {
                                m_vars[i].flags.is_static_dstn = false;
                            }
                        }
                        m_vars_extra[i].src_data = ptr_data;
                    }

                    if (m_is_openmp) {
                        if (m_vars[i].flags.is_static) {
                            // Static data is transferred only by omp target
                            // update construct which passes zeros for
                            // alloc_if and free_if.
                            if (m_vars[i].alloc_if || m_vars[i].free_if) {
                                m_vars[i].direction.bits = c_parameter_nocopy;
                            }
                        }
                        else {
                            AutoData *auto_data;
                            if (m_vars[i].alloc_if) {
                                auto_data = m_device.insert_auto_data(
                                    m_vars[i].ptr, m_vars[i].size);
                                auto_data->add_reference();
                            }
                            else {
                                // TODO: what should be done if var is not in
                                // the table?
                                auto_data = m_device.find_auto_data(
                                    m_vars[i].ptr);
                            }

                            // For automatic variables data is transferred
                            // only if alloc_if == 0 && free_if == 0
                            // or reference count is 1
                            if ((m_vars[i].alloc_if || m_vars[i].free_if) &&
                                auto_data != 0 &&
                                auto_data->get_reference() != 1) {
                                m_vars[i].direction.bits = c_parameter_nocopy;
                            }

                            // save data for later use
                            m_vars_extra[i].auto_data = auto_data;
                        }
                    }

                    if (m_vars[i].direction.in &&
                        !m_vars[i].flags.is_static) {
                        m_in_datalen += m_vars[i].size;

                        // for non-static target destination defined as CEAN
                        // expression we pass to target its size and dist
                        if (m_vars[i].into == NULL &&
                            m_vars[i].type.src == c_cean_var) {
                            m_in_datalen += 2 * sizeof(uint64_t);
                        }
                        m_need_runfunction = true;
                    }
                    if (m_vars[i].direction.out &&
                        !m_vars[i].flags.is_static) {
                        m_out_datalen += m_vars[i].size;
                        m_need_runfunction = true;
                    }
                }
                break;

            case c_dv:
                if (m_vars[i].direction.bits ||
                    m_vars[i].alloc_if ||
                    m_vars[i].free_if) {
                    ArrDesc *dvp = static_cast<ArrDesc*>(m_vars[i].ptr);

                    // debug dump
                    __dv_desc_dump("IN/OUT", dvp);

                    // send dope vector contents excluding base
                    m_in_datalen += m_vars[i].size - sizeof(uint64_t);
                    m_need_runfunction = true;
                }
                break;

            case c_string_ptr:
                if ((m_vars[i].direction.bits ||
                     m_vars[i].alloc_if ||
                     m_vars[i].free_if) &&
                    m_vars[i].size == 0) {
                    m_vars[i].size = 1;
                    m_vars[i].count =
                        strlen(*static_cast<char**>(m_vars[i].ptr)) + 1;
                }
                /* fallthru */

            case c_data_ptr:
                if (m_vars[i].flags.is_stack_buf &&
                    !m_vars[i].direction.bits &&
                    m_vars[i].alloc_if) {
                    // this var_desc is for stack buffer
                    bool is_new;

                    if (!offload_stack_memory_manager(
                            stack_addr, entry_id,
                            m_vars[i].count, m_vars[i].align, &is_new)) {
                        return false;
                    }
                    if (is_new) {
                        m_compute_buffers.push_back(
                            m_stack_ptr_data->mic_buf);
                        m_device.m_persist_list.front().cpu_stack_addr =
                            static_cast<char*>(m_vars[i].ptr);
                    }
                    else {
                        m_vars[i].flags.sink_addr = 1;
                        m_in_datalen += sizeof(m_stack_ptr_data->mic_addr);
                    }
                    m_vars[i].size = m_destroy_stack.size();
                    m_vars_extra[i].src_data = m_stack_ptr_data;
                    // need to add reference for buffer
                    m_need_runfunction = true;
                    break;
                }
                /* fallthru */

            case c_cean_var_ptr:
            case c_dv_ptr:
                if (m_vars[i].type.src == c_cean_var_ptr) {
                    // array descriptor
                    const arr_desc *ap =
                        static_cast<const arr_desc*>(m_vars[i].ptr);

                    // debug dump
                    __arr_desc_dump("", "IN/OUT", ap, 1);

                    // offset and length are derived from the array descriptor
                    __arr_data_offset_and_length(ap, m_vars[i].disp,
                                                 m_vars[i].size);

                    if (!is_arr_desc_contiguous(ap)) {
                        m_vars[i].flags.is_noncont_src = 1;
                        m_vars_extra[i].read_rng_src =
                            init_read_ranges_arr_desc(ap);
                    }
                    // all necessary information about length and offset is
                    // transferred in var descriptor. There is no need to send
                    // array descriptor to the target side.
                    m_vars[i].ptr = reinterpret_cast<void*>(ap->base);
                }
                else if (m_vars[i].type.src == c_dv_ptr) {
                    // need to send DV to the device unless it is 'nocopy'
                    if (m_vars[i].direction.bits ||
                        m_vars[i].alloc_if ||
                        m_vars[i].free_if) {
                        ArrDesc *dvp = *static_cast<ArrDesc**>(m_vars[i].ptr);

                        // debug dump
                        __dv_desc_dump("IN/OUT", dvp);

                        m_vars[i].direction.bits = c_parameter_in;
                    }

                    // no displacement
                    m_vars[i].disp = 0;
                }
                else {
                    // c_data_ptr or c_string_ptr
                    m_vars[i].size *= m_vars[i].count;
                    m_vars[i].disp = 0;
                }

                if (m_vars[i].direction.bits ||
                    m_vars[i].alloc_if ||
                    m_vars[i].free_if) {
                    PtrData *ptr_data;

                    // check that buffer length >= 0
                    if (m_vars[i].alloc_if &&
                        m_vars[i].disp + m_vars[i].size < 0) {
                        LIBOFFLOAD_ERROR(c_zero_or_neg_ptr_len);
                        exit(1);
                    }

                    // base address
                    void *base = *static_cast<void**>(m_vars[i].ptr);

                    // allocate buffer if we have no INTO and don't need
                    // allocation for the ptr at target
                    if (src_is_for_mic) {
                        if (m_vars[i].flags.is_stack_buf) {
                            // for stack persistent objects ptr data is created
                            // by var_desc with number 0.
                            // Its ptr_data is stored at m_stack_ptr_data
                            ptr_data = m_stack_ptr_data;
                            m_vars[i].flags.sink_addr = 1;
                        }
                        else if (m_vars[i].alloc_if) {
                            // add new entry
                            if (!alloc_ptr_data(
                                    ptr_data,
                                    base,
                                    (alloc_base != NULL) ?
                                        alloc_disp : m_vars[i].disp,
                                    (alloc_base != NULL) ?
                                        alloc_size : m_vars[i].size,
                                    alloc_disp,
                                    (alloc_base != NULL) ?
                                        0 : m_vars[i].align)) {
                                return false;
                            }

                            if (ptr_data->add_reference() == 0 &&
                                ptr_data->mic_buf != 0) {
                                // add buffer to the list of buffers that
                                // are passed to dispatch call
                                m_compute_buffers.push_back(
                                    ptr_data->mic_buf);
                            }
                            else {
                                // will send buffer address to device
                                m_vars[i].flags.sink_addr = 1;
                            }

                            if (!ptr_data->is_static) {
                                // need to add reference for buffer
                                m_need_runfunction = true;
                            }
                        }
                        else {
                            bool error_if_not_found = true;
                            if (m_is_openmp) {
                                // For omp target update variable is ignored
                                // if it does not exist.
                                if (!m_vars[i].alloc_if &&
                                    !m_vars[i].free_if) {
                                    error_if_not_found = false;
                                }
                            }

                            // use existing association from pointer table
                            if (!find_ptr_data(ptr_data,
                                               base,
                                               m_vars[i].disp,
                                               m_vars[i].size,
                                               error_if_not_found)) {
                                return false;
                            }

                            if (m_is_openmp) {
                                // make var nocopy if it does not exist
                                if (ptr_data == 0) {
                                    m_vars[i].direction.bits =
                                        c_parameter_nocopy;
                                }
                            }

                            if (ptr_data != 0) {
                                m_vars[i].flags.sink_addr = 1;
                            }
                        }

                        if (ptr_data != 0) {
                            if (m_is_openmp) {
                                // data is transferred only if
                                // alloc_if == 0 && free_if == 0
                                // or reference count is 1
                                if ((m_vars[i].alloc_if ||
                                     m_vars[i].free_if) &&
                                    ptr_data->get_reference() != 1) {
                                    m_vars[i].direction.bits =
                                        c_parameter_nocopy;
                                }
                            }

                            if (ptr_data->alloc_disp != 0) {
                                m_vars[i].flags.alloc_disp = 1;
                                m_in_datalen += sizeof(alloc_disp);
                            }

                            if (m_vars[i].flags.sink_addr) {
                                // get buffers's address on the sink
                                if (!init_mic_address(ptr_data)) {
                                    return false;
                                }

                                m_in_datalen += sizeof(ptr_data->mic_addr);
                            }

                            if (!ptr_data->is_static && m_vars[i].free_if) {
                                // need to decrement buffer reference on target
                                m_need_runfunction = true;
                            }

                            // offset to base from the beginning of the buffer
                            // memory
                            m_vars[i].offset = (char*) base -
                                (char*) ptr_data->cpu_addr.start();

                            // copy other pointer properties to var descriptor
                            m_vars[i].mic_offset = ptr_data->mic_offset;
                            m_vars[i].flags.is_static = ptr_data->is_static;
                        }
                    }
                    else {
                        if (!find_ptr_data(ptr_data,
                                           base,
                                           m_vars[i].disp,
                                           m_vars[i].size,
                                           false)) {
                            return false;
                        }
                        if (ptr_data) {
                            m_vars[i].offset =
                                (char*) base -
                                (char*) ptr_data->cpu_addr.start();
                        }
                    }

                    // save pointer data
                    m_vars_extra[i].src_data = ptr_data;
                }
                break;

            case c_func_ptr:
                if (m_vars[i].direction.in) {
                    m_in_datalen += __offload_funcs.max_name_length();
                }
                if (m_vars[i].direction.out) {
                    m_out_datalen += __offload_funcs.max_name_length();
                }
                m_need_runfunction = true;
                break;

            case c_dv_data:
            case c_dv_ptr_data:
            case c_dv_data_slice:
            case c_dv_ptr_data_slice:
                ArrDesc *dvp;
                if (VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.src)) {
                    const arr_desc *ap;
                    ap = static_cast<const arr_desc*>(m_vars[i].ptr);

                    dvp = (m_vars[i].type.src == c_dv_data_slice) ?
                          reinterpret_cast<ArrDesc*>(ap->base) :
                          *reinterpret_cast<ArrDesc**>(ap->base);
                }
                else {
                    dvp = (m_vars[i].type.src == c_dv_data) ?
                          static_cast<ArrDesc*>(m_vars[i].ptr) :
                          *static_cast<ArrDesc**>(m_vars[i].ptr);
                }

                // if allocatable dope vector isn't allocated don't
                // transfer its data
                if (!__dv_is_allocated(dvp)) {
                    m_vars[i].direction.bits = c_parameter_nocopy;
                    m_vars[i].alloc_if = 0;
                    m_vars[i].free_if = 0;
                }
                if (m_vars[i].direction.bits ||
                    m_vars[i].alloc_if ||
                    m_vars[i].free_if) {
                    const arr_desc *ap;

                    if (VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.src)) {
                        ap = static_cast<const arr_desc*>(m_vars[i].ptr);

                        // debug dump
                        __arr_desc_dump("", "IN/OUT", ap, 0);
                    }
                    if (!__dv_is_contiguous(dvp)) {
                        m_vars[i].flags.is_noncont_src = 1;
                        m_vars_extra[i].read_rng_src =
                            init_read_ranges_dv(dvp);
                    }

                    // size and displacement
                    if (VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.src)) {
                        // offset and length are derived from the
                        // array descriptor
                        __arr_data_offset_and_length(ap,
                                                     m_vars[i].disp,
                                                     m_vars[i].size);
                        if (m_vars[i].direction.bits) {
                            if (!is_arr_desc_contiguous(ap)) {
                                if (m_vars[i].flags.is_noncont_src) {
                                    LIBOFFLOAD_ERROR(c_slice_of_noncont_array);
                                    return false;
                                }
                                m_vars[i].flags.is_noncont_src = 1;
                                m_vars_extra[i].read_rng_src =
                                    init_read_ranges_arr_desc(ap);
                            }
                        }
                    }
                    else {
                        if (m_vars[i].flags.has_length) {
                            m_vars[i].size =
                                __dv_data_length(dvp, m_vars[i].count);
                        }
                        else {
                            m_vars[i].size = __dv_data_length(dvp);
                        }
                        m_vars[i].disp = 0;
                    }

                    // check that length >= 0
                    if (m_vars[i].alloc_if &&
                        (m_vars[i].disp + m_vars[i].size < 0)) {
                        LIBOFFLOAD_ERROR(c_zero_or_neg_ptr_len);
                        exit(1);
                    }

                    // base address
                    void *base = reinterpret_cast<void*>(dvp->Base);
                    PtrData *ptr_data;

                    // allocate buffer if we have no INTO and don't need
                    // allocation for the ptr at target
                    if (src_is_for_mic) {
                        if (m_vars[i].alloc_if) {
                            // add new entry
                            if (!alloc_ptr_data(
                                    ptr_data,
                                    base,
                                    (alloc_base != NULL) ?
                                        alloc_disp : m_vars[i].disp,
                                    (alloc_base != NULL) ?
                                        alloc_size : m_vars[i].size,
                                    alloc_disp,
                                    (alloc_base != NULL) ?
                                        0 : m_vars[i].align)) {
                                return false;
                            }

                            if (ptr_data->add_reference() == 0 &&
                                ptr_data->mic_buf != 0) {
                                // add buffer to the list of buffers
                                // that are passed to dispatch call
                                m_compute_buffers.push_back(
                                    ptr_data->mic_buf);
                            }
                            else {
                                // will send buffer address to device
                                m_vars[i].flags.sink_addr = 1;
                            }

                            if (!ptr_data->is_static) {
                                // need to add reference for buffer
                                m_need_runfunction = true;
                            }
                        }
                        else {
                            bool error_if_not_found = true;
                            if (m_is_openmp) {
                                // For omp target update variable is ignored
                                // if it does not exist.
                                if (!m_vars[i].alloc_if &&
                                    !m_vars[i].free_if) {
                                    error_if_not_found = false;
                                }
                            }

                            // use existing association from pointer table
                            if (!find_ptr_data(ptr_data,
                                               base,
                                               m_vars[i].disp,
                                               m_vars[i].size,
                                               error_if_not_found)) {
                                return false;
                            }

                            if (m_is_openmp) {
                                // make var nocopy if it does not exist
                                if (ptr_data == 0) {
                                    m_vars[i].direction.bits =
                                        c_parameter_nocopy;
                                }
                            }

                            if (ptr_data != 0) {
                                // need to update base in dope vector on device
                                m_vars[i].flags.sink_addr = 1;
                            }
                        }

                        if (ptr_data != 0) {
                            if (m_is_openmp) {
                                // data is transferred only if
                                // alloc_if == 0 && free_if == 0
                                // or reference count is 1
                                if ((m_vars[i].alloc_if ||
                                     m_vars[i].free_if) &&
                                    ptr_data->get_reference() != 1) {
                                    m_vars[i].direction.bits =
                                        c_parameter_nocopy;
                                }
                            }

                            if (ptr_data->alloc_disp != 0) {
                                m_vars[i].flags.alloc_disp = 1;
                                m_in_datalen += sizeof(alloc_disp);
                            }

                            if (m_vars[i].flags.sink_addr) {
                                // get buffers's address on the sink
                                if (!init_mic_address(ptr_data)) {
                                    return false;
                                }

                                m_in_datalen += sizeof(ptr_data->mic_addr);
                            }

                            if (!ptr_data->is_static && m_vars[i].free_if) {
                                // need to decrement buffer reference on target
                                m_need_runfunction = true;
                            }

                            // offset to base from the beginning of the buffer
                            // memory
                            m_vars[i].offset =
                                (char*) base -
                                (char*) ptr_data->cpu_addr.start();

                            // copy other pointer properties to var descriptor
                            m_vars[i].mic_offset = ptr_data->mic_offset;
                            m_vars[i].flags.is_static = ptr_data->is_static;
                        }
                    }
                    else { // !src_is_for_mic
                        if (!find_ptr_data(ptr_data,
                                           base,
                                           m_vars[i].disp,
                                           m_vars[i].size,
                                           false)) {
                            return false;
                        }
                        m_vars[i].offset = !ptr_data ? 0 :
                                (char*) base -
                                (char*) ptr_data->cpu_addr.start();
                    }

                    // save pointer data
                    m_vars_extra[i].src_data = ptr_data;
                }
                break;

            default:
                LIBOFFLOAD_ERROR(c_unknown_var_type, m_vars[i].type.src);
                LIBOFFLOAD_ABORT;
        }
        if (m_vars[i].type.src == c_data_ptr_array) {
            continue;
        }

        if (src_is_for_mic && m_vars[i].flags.is_stack_buf) {
            m_vars[i].offset = static_cast<char*>(m_vars[i].ptr) -
                m_device.m_persist_list.front().cpu_stack_addr;
        }
        // if source is used at CPU save its offset and disp
        if (m_vars[i].into == NULL || m_vars[i].direction.in) {
            m_vars_extra[i].cpu_offset = m_vars[i].offset;
            m_vars_extra[i].cpu_disp   = m_vars[i].disp;
        }

        // If "into" is define we need to do the similar work for it
        if (!m_vars[i].into) {
            continue;
        }

        int64_t into_disp =0, into_offset = 0;

        switch (m_vars[i].type.dst) {
            case c_data_ptr_array:
                break;
            case c_data:
            case c_void_ptr:
            case c_cean_var: {
                int64_t size = m_vars[i].size;

                if (m_vars[i].type.dst == c_cean_var) {
                    // array descriptor
                    const arr_desc *ap =
                        static_cast<const arr_desc*>(m_vars[i].into);

                    // debug dump
                    __arr_desc_dump("    ", "INTO", ap, 0);

                    // offset and length are derived from the array descriptor
                    __arr_data_offset_and_length(ap, into_disp, size);

                    if (!is_arr_desc_contiguous(ap)) {
                        m_vars[i].flags.is_noncont_dst = 1;
                        m_vars_extra[i].read_rng_dst =
                            init_read_ranges_arr_desc(ap);
                        if (!cean_ranges_match(
                            m_vars_extra[i].read_rng_src,
                            m_vars_extra[i].read_rng_dst)) {
                            LIBOFFLOAD_ERROR(c_ranges_dont_match);
                            exit(1);
                        }
                    }
                    m_vars[i].into = reinterpret_cast<void*>(ap->base);
                }

                int64_t size_src = m_vars_extra[i].read_rng_src ?
                    cean_get_transf_size(m_vars_extra[i].read_rng_src) :
                    m_vars[i].size;
                int64_t size_dst = m_vars_extra[i].read_rng_dst ?
                    cean_get_transf_size(m_vars_extra[i].read_rng_dst) :
                    size;
                // It's supposed that "into" size must be not less
                // than src size
                if (size_src > size_dst) {
                    LIBOFFLOAD_ERROR(c_different_src_and_dstn_sizes,
                                     size_src, size_dst);
                    exit(1);
                }

                if (m_vars[i].direction.bits) {
                    if (m_vars[i].flags.is_static_dstn) {
                        PtrData *ptr_data;

                        // find data associated with variable
                        if (!find_ptr_data(ptr_data, m_vars[i].into,
                                           into_disp, size, false)) {
                            return false;
                        }
                        if (ptr_data != 0) {
                            // offset to base from the beginning of the buffer
                            // memory
                            into_offset =
                                (char*) m_vars[i].into -
                                (char*) ptr_data->cpu_addr.start();
                        }
                        else {
                            m_vars[i].flags.is_static_dstn = false;
                        }
                        m_vars_extra[i].dst_data = ptr_data;
                    }
                }

                if (m_vars[i].direction.in &&
                    !m_vars[i].flags.is_static_dstn) {
                    m_in_datalen += m_vars[i].size;

                    // for non-static target destination defined as CEAN
                    // expression we pass to target its size and dist
                    if (m_vars[i].type.dst == c_cean_var) {
                        m_in_datalen += 2 * sizeof(uint64_t);
                    }
                    m_need_runfunction = true;
                }
                break;
            }

            case c_dv:
                if (m_vars[i].direction.bits ||
                    m_vars[i].alloc_if ||
                    m_vars[i].free_if) {
                    ArrDesc *dvp = static_cast<ArrDesc*>(m_vars[i].into);

                    // debug dump
                    __dv_desc_dump("INTO", dvp);

                    // send dope vector contents excluding base
                    m_in_datalen += m_vars[i].size - sizeof(uint64_t);
                    m_need_runfunction = true;
                }
                break;

            case c_string_ptr:
            case c_data_ptr:
            case c_cean_var_ptr:
            case c_dv_ptr: {
                int64_t size = m_vars[i].size;

                if (m_vars[i].type.dst == c_cean_var_ptr) {
                    // array descriptor
                    const arr_desc *ap =
                        static_cast<const arr_desc*>(m_vars[i].into);

                    // debug dump
                    __arr_desc_dump("    ", "INTO", ap, 1);

                    // offset and length are derived from the array descriptor
                    __arr_data_offset_and_length(ap, into_disp, size);

                    if (!is_arr_desc_contiguous(ap)) {
                        m_vars[i].flags.is_noncont_src = 1;
                        m_vars_extra[i].read_rng_dst =
                            init_read_ranges_arr_desc(ap);
                        if (!cean_ranges_match(
                            m_vars_extra[i].read_rng_src,
                            m_vars_extra[i].read_rng_dst)) {
                            LIBOFFLOAD_ERROR(c_ranges_dont_match);
                        }
                    }
                    m_vars[i].into = reinterpret_cast<char**>(ap->base);
                }
                else if (m_vars[i].type.dst == c_dv_ptr) {
                    // need to send DV to the device unless it is 'nocopy'
                    if (m_vars[i].direction.bits ||
                        m_vars[i].alloc_if ||
                        m_vars[i].free_if) {
                        ArrDesc *dvp = *static_cast<ArrDesc**>(m_vars[i].into);

                        // debug dump
                        __dv_desc_dump("INTO", dvp);

                        m_vars[i].direction.bits = c_parameter_in;
                    }
                }

                int64_t size_src = m_vars_extra[i].read_rng_src ?
                    cean_get_transf_size(m_vars_extra[i].read_rng_src) :
                    m_vars[i].size;
                int64_t size_dst = m_vars_extra[i].read_rng_dst ?
                    cean_get_transf_size(m_vars_extra[i].read_rng_dst) :
                    size;
                // It's supposed that "into" size must be not less than
                // src size
                if (size_src > size_dst) {
                    LIBOFFLOAD_ERROR(c_different_src_and_dstn_sizes,
                                     size_src, size_dst);
                    exit(1);
                }

                if (m_vars[i].direction.bits) {
                    PtrData *ptr_data;

                    // base address
                    void *base = *static_cast<void**>(m_vars[i].into);

                    if (m_vars[i].direction.in) {
                        // allocate buffer
                        if (m_vars[i].flags.is_stack_buf) {
                            // for stack persistent objects ptr data is created
                            // by var_desc with number 0.
                            // Its ptr_data is stored at m_stack_ptr_data
                            ptr_data = m_stack_ptr_data;
                            m_vars[i].flags.sink_addr = 1;
                        }
                        else if (m_vars[i].alloc_if) {
                            // add new entry
                            if (!alloc_ptr_data(
                                    ptr_data,
                                    base,
                                    (alloc_base != NULL) ?
                                        alloc_disp : into_disp,
                                    (alloc_base != NULL) ?
                                        alloc_size : size,
                                    alloc_disp,
                                    (alloc_base != NULL) ?
                                        0 : m_vars[i].align)) {
                                return false;
                            }

                            if (ptr_data->add_reference() == 0 &&
                                ptr_data->mic_buf != 0) {
                                // add buffer to the list of buffers that
                                // are passed to dispatch call
                                m_compute_buffers.push_back(
                                    ptr_data->mic_buf);
                            }
                            else {
                                // will send buffer address to device
                                m_vars[i].flags.sink_addr = 1;
                            }

                            if (!ptr_data->is_static) {
                                // need to add reference for buffer
                                m_need_runfunction = true;
                            }
                        }
                        else {
                            // use existing association from pointer table
                            if (!find_ptr_data(ptr_data, base, into_disp, size)) {
                                return false;
                            }
                            m_vars[i].flags.sink_addr = 1;
                        }

                        if (ptr_data->alloc_disp != 0) {
                            m_vars[i].flags.alloc_disp = 1;
                            m_in_datalen += sizeof(alloc_disp);
                        }

                        if (m_vars[i].flags.sink_addr) {
                            // get buffers's address on the sink
                            if (!init_mic_address(ptr_data)) {
                                return false;
                            }

                            m_in_datalen += sizeof(ptr_data->mic_addr);
                        }

                        if (!ptr_data->is_static && m_vars[i].free_if) {
                            // need to decrement buffer reference on target
                            m_need_runfunction = true;
                        }

                        // copy other pointer properties to var descriptor
                        m_vars[i].mic_offset = ptr_data->mic_offset;
                        m_vars[i].flags.is_static_dstn = ptr_data->is_static;
                    }
                    else {
                        if (!find_ptr_data(ptr_data,
                                           base,
                                           into_disp,
                                           m_vars[i].size,
                                           false)) {
                            return false;
                        }
                    }
                    if (ptr_data) {
                        into_offset = ptr_data ?
                            (char*) base -
                            (char*) ptr_data->cpu_addr.start() :
                            0;
                    }
                    // save pointer data
                    m_vars_extra[i].dst_data = ptr_data;
                }
                break;
            }

            case c_func_ptr:
                break;

            case c_dv_data:
            case c_dv_ptr_data:
            case c_dv_data_slice:
            case c_dv_ptr_data_slice:
                if (m_vars[i].direction.bits ||
                    m_vars[i].alloc_if ||
                    m_vars[i].free_if) {
                    const arr_desc *ap;
                    ArrDesc *dvp;
                    PtrData *ptr_data;
                    int64_t disp;
                    int64_t size;

                    if (VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.dst)) {
                        ap = static_cast<const arr_desc*>(m_vars[i].into);

                        // debug dump
                        __arr_desc_dump("    ", "INTO", ap, 0);

                        dvp = (m_vars[i].type.dst == c_dv_data_slice) ?
                              reinterpret_cast<ArrDesc*>(ap->base) :
                              *reinterpret_cast<ArrDesc**>(ap->base);
                    }
                    else {
                        dvp = (m_vars[i].type.dst == c_dv_data) ?
                              static_cast<ArrDesc*>(m_vars[i].into) :
                              *static_cast<ArrDesc**>(m_vars[i].into);
                    }
                    if (!__dv_is_contiguous(dvp)) {
                        m_vars[i].flags.is_noncont_dst = 1;
                        m_vars_extra[i].read_rng_dst =
                            init_read_ranges_dv(dvp);
                    }
                    // size and displacement
                    if (VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.dst)) {
                        // offset and length are derived from the array
                        // descriptor
                        __arr_data_offset_and_length(ap, into_disp, size);
                        if (m_vars[i].direction.bits) {
                            if (!is_arr_desc_contiguous(ap)) {
                                if (m_vars[i].flags.is_noncont_dst) {
                                    LIBOFFLOAD_ERROR(c_slice_of_noncont_array);
                                    return false;
                                }
                                m_vars[i].flags.is_noncont_dst = 1;
                                m_vars_extra[i].read_rng_dst =
                                    init_read_ranges_arr_desc(ap);
                                if (!cean_ranges_match(
                                    m_vars_extra[i].read_rng_src,
                                    m_vars_extra[i].read_rng_dst)) {
                                    LIBOFFLOAD_ERROR(c_ranges_dont_match);
                                }
                            }
                        }
                    }
                    else {
                        if (m_vars[i].flags.has_length) {
                            size = __dv_data_length(dvp, m_vars[i].count);
                        }
                        else {
                            size = __dv_data_length(dvp);
                        }
                        disp = 0;
                    }

                    int64_t size_src =
                        m_vars_extra[i].read_rng_src ?
                        cean_get_transf_size(m_vars_extra[i].read_rng_src) :
                        m_vars[i].size;
                    int64_t size_dst =
                        m_vars_extra[i].read_rng_dst ?
                        cean_get_transf_size(m_vars_extra[i].read_rng_dst) :
                        size;
                    // It's supposed that "into" size must be not less
                    // than src size
                    if (size_src > size_dst) {
                        LIBOFFLOAD_ERROR(c_different_src_and_dstn_sizes,
                            size_src, size_dst);
                        exit(1);
                    }

                    // base address
                    void *base = reinterpret_cast<void*>(dvp->Base);

                    // allocate buffer
                    if (m_vars[i].direction.in) {
                        if (m_vars[i].alloc_if) {
                            // add new entry
                            if (!alloc_ptr_data(
                                    ptr_data,
                                    base,
                                    (alloc_base != NULL) ?
                                        alloc_disp : into_disp,
                                    (alloc_base != NULL) ?
                                        alloc_size : size,
                                    alloc_disp,
                                    (alloc_base != NULL) ?
                                        0 : m_vars[i].align)) {
                                return false;
                            }
                            if (ptr_data->add_reference() == 0 &&
                                ptr_data->mic_buf !=0) {
                                // add buffer to the list of buffers
                                // that are passed to dispatch call
                                m_compute_buffers.push_back(
                                    ptr_data->mic_buf);
                            }
                            else {
                                // will send buffer address to device
                                m_vars[i].flags.sink_addr = 1;
                            }

                            if (!ptr_data->is_static) {
                                // need to add reference for buffer
                                m_need_runfunction = true;
                            }
                        }
                        else {
                            // use existing association from pointer table
                            if (!find_ptr_data(ptr_data, base, into_disp, size)) {
                                return false;
                            }

                            // need to update base in dope vector on device
                            m_vars[i].flags.sink_addr = 1;
                        }

                        if (ptr_data->alloc_disp != 0) {
                            m_vars[i].flags.alloc_disp = 1;
                            m_in_datalen += sizeof(alloc_disp);
                        }

                        if (m_vars[i].flags.sink_addr) {
                            // get buffers's address on the sink
                            if (!init_mic_address(ptr_data)) {
                                return false;
                            }
                            m_in_datalen += sizeof(ptr_data->mic_addr);
                        }

                        if (!ptr_data->is_static && m_vars[i].free_if) {
                            // need to decrement buffer reference on target
                            m_need_runfunction = true;
                        }

                        // offset to base from the beginning of the buffer
                        // memory
                        into_offset =
                            (char*) base - (char*) ptr_data->cpu_addr.start();

                        // copy other pointer properties to var descriptor
                        m_vars[i].mic_offset = ptr_data->mic_offset;
                        m_vars[i].flags.is_static_dstn = ptr_data->is_static;
                    }
                    else { // src_is_for_mic
                        if (!find_ptr_data(ptr_data,
                                           base,
                                           into_disp,
                                           size,
                                           false)) {
                            return false;
                        }
                        into_offset = !ptr_data ?
                            0 :
                            (char*) base - (char*) ptr_data->cpu_addr.start();
                    }

                    // save pointer data
                    m_vars_extra[i].dst_data = ptr_data;
                }
                break;

            default:
                LIBOFFLOAD_ERROR(c_unknown_var_type, m_vars[i].type.src);
                LIBOFFLOAD_ABORT;
        }
        // if into is used at CPU save its offset and disp
        if (m_vars[i].direction.out) {
            m_vars_extra[i].cpu_offset = into_offset;
            m_vars_extra[i].cpu_disp   = into_disp;
        }
        else {
            if (m_vars[i].flags.is_stack_buf) {
                into_offset = static_cast<char*>(m_vars[i].into) -
                    m_device.m_persist_list.front().cpu_stack_addr;
            }
            m_vars[i].offset = into_offset;
            m_vars[i].disp   = into_disp;
        }
    }

    return true;
}

bool OffloadDescriptor::setup_misc_data(const char *name)
{
    OffloadTimer timer(get_timer_data(), c_offload_host_setup_misc_data);

    // we can skip run functon call together with wait if offloaded
    // region is empty and there is no user defined non-pointer IN/OUT data
    if (m_need_runfunction) {
        // variable descriptors are sent as input data
        m_in_datalen += m_vars_total * sizeof(VarDesc);

        // timer data is sent as a part of the output data
        m_out_datalen += OFFLOAD_TIMER_DATALEN();

        // max from input data and output data length
        uint64_t data_len = m_in_datalen > m_out_datalen ? m_in_datalen :
                                                           m_out_datalen;

        // Misc data has the following layout
        //     <Function Descriptor>
        //     <Function Name>
        //     <In/Out Data>            (optional)
        //
        // We can transfer copyin/copyout data in misc/return data which can
        // be passed to run function call if its size does not exceed
        // COI_PIPELINE_MAX_IN_MISC_DATA_LEN. Otherwise we have to allocate
        // buffer for it.

        m_func_desc_size = sizeof(FunctionDescriptor) + strlen(name) + 1;
        m_func_desc_size = (m_func_desc_size + 7) & ~7;

        int misc_data_offset = 0;
        int misc_data_size = 0;
        if (data_len > 0) {
            if (m_func_desc_size +
                m_in_datalen <= COI_PIPELINE_MAX_IN_MISC_DATA_LEN &&
                m_out_datalen <= COI_PIPELINE_MAX_IN_MISC_DATA_LEN) {
                // use misc/return data for copyin/copyout
                misc_data_offset = m_func_desc_size;
                misc_data_size = data_len;
            }
            else {
                OffloadTimer timer_buf(get_timer_data(),
                                       c_offload_host_alloc_data_buffer);

                // send/receive data using buffer
                COIRESULT res = COI::BufferCreate(data_len,
                                                  COI_BUFFER_NORMAL,
                                                  0, 0,
                                                  1, &m_device.get_process(),
                                                  &m_inout_buf);
                if (res != COI_SUCCESS) {
                    if (m_status != 0) {
                        m_status->result = translate_coi_error(res);
                        return false;
                    }
                    report_coi_error(c_buf_create, res);
                }

                m_compute_buffers.push_back(m_inout_buf);
                m_destroy_buffers.push_back(m_inout_buf);
            }
        }

        // initialize function descriptor
        m_func_desc = (FunctionDescriptor*) malloc(m_func_desc_size +
                                                   misc_data_size);
        if (m_func_desc == NULL)
          LIBOFFLOAD_ERROR(c_malloc);
        m_func_desc->console_enabled = console_enabled;
        m_func_desc->timer_enabled =
            timer_enabled || (offload_report_level && offload_report_enabled);
        m_func_desc->offload_report_level = offload_report_level;
        m_func_desc->offload_number = GET_OFFLOAD_NUMBER(get_timer_data());
        m_func_desc->in_datalen = m_in_datalen;
        m_func_desc->out_datalen = m_out_datalen;
        m_func_desc->vars_num = m_vars_total;
        m_func_desc->data_offset = misc_data_offset;

        // append entry name
        strcpy(m_func_desc->data, name);
    }

    return true;
}

bool OffloadDescriptor::wait_dependencies(
    const void **waits,
    int num_waits
)
{
    OffloadTimer timer(get_timer_data(), c_offload_host_wait_deps);
    bool ret = true;

    for (int i = 0; i < num_waits; i++) {

        OffloadDescriptor *task = m_device.find_signal(waits[i], true);
        if (task == 0) {
            LIBOFFLOAD_ERROR(c_offload1, m_device.get_logical_index(),
                             waits[i]);
            LIBOFFLOAD_ABORT;
        }

        if (!task->offload_finish()) {
            ret = false;
        }

        task->cleanup();
        delete task;
    }

    return ret;
}

bool OffloadDescriptor::offload(
    const char *name,
    bool is_empty,
    VarDesc *vars,
    VarDesc2 *vars2,
    int vars_total,
    const void **waits,
    int num_waits,
    const void **signal,
    int entry_id,
    const void *stack_addr
)
{
    if (signal == 0) {
        OFFLOAD_DEBUG_TRACE_1(1,
                      GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_init_func,
                      "Offload function %s, is_empty=%d, #varDescs=%d, "
                      "#waits=%d, signal=none\n",
                      name, is_empty, vars_total, num_waits);
        OFFLOAD_REPORT(3, GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_sent_pointer_data,
                      "#Wait : %d \n", num_waits);
        OFFLOAD_REPORT(3, GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_signal,
                      "none %d\n", 0);
    }
    else {
        OFFLOAD_DEBUG_TRACE_1(1,
                      GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_init_func,
                      "Offload function %s, is_empty=%d, #varDescs=%d, "
                      "#waits=%d, signal=%p\n",
                      name, is_empty, vars_total, num_waits,
                      *signal);

        OFFLOAD_REPORT(3, GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_signal,
                      "%d\n", signal);
    }
    OFFLOAD_REPORT(3, GET_OFFLOAD_NUMBER(get_timer_data()),
                      c_offload_wait,
                      "#Wait : %d  %p\n", num_waits, waits);

    if (m_status != 0) {
        m_status->result = OFFLOAD_SUCCESS;
        m_status->device_number = m_device.get_logical_index();
    }

    m_need_runfunction = !is_empty;

    // wait for dependencies to finish
    if (!wait_dependencies(waits, num_waits)) {
        cleanup();
        return false;
    }

    // setup buffers
    if (!setup_descriptors(vars, vars2, vars_total, entry_id, stack_addr)) {
        cleanup();
        return false;
    }

    // initiate send for pointers. Want to do it as early as possible.
    if (!send_pointer_data(signal != 0)) {
        cleanup();
        return false;
    }

    // setup misc data for run function
    if (!setup_misc_data(name)) {
        cleanup();
        return false;
    }

    // gather copyin data into buffer
    if (!gather_copyin_data()) {
        cleanup();
        return false;
    }

    // Start the computation
    if (!compute()) {
        cleanup();
        return false;
    }

    // initiate receive for pointers
    if (!receive_pointer_data(signal != 0)) {
        cleanup();
        return false;
    }

    // if there is a signal save descriptor for the later use.
    if (signal != 0) {
        m_device.add_signal(*signal, this);
        return true;
    }

    // wait for the offload to finish.
    if (!offload_finish()) {
        cleanup();
        return false;
    }

    cleanup();
    return true;
}

bool OffloadDescriptor::offload_finish()
{
    COIRESULT res;

    // wait for compute dependencies to become signaled
    if (m_in_deps_total > 0) {
        OffloadTimer timer(get_timer_data(), c_offload_host_wait_compute);

        if (__offload_active_wait) {
            // keep CPU busy
            do {
                res = COI::EventWait(m_in_deps_total, m_in_deps, 0, 1, 0, 0);
            }
            while (res == COI_TIME_OUT_REACHED);
        }
        else {
            res = COI::EventWait(m_in_deps_total, m_in_deps, -1, 1, 0, 0);
        }

        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
                return false;
            }
            report_coi_error(c_event_wait, res);
        }
    }

    // scatter copyout data received from target
    if (!scatter_copyout_data()) {
        return false;
    }
    // wait for receive dependencies to become signaled
    if (m_out_deps_total > 0) {
        OffloadTimer timer(get_timer_data(), c_offload_host_wait_buffers_reads);

        if (__offload_active_wait) {
            // keep CPU busy
            do {
                res = COI::EventWait(m_out_deps_total, m_out_deps, 0, 1, 0, 0);
            }
            while (res == COI_TIME_OUT_REACHED);
        }
        else {
            res = COI::EventWait(m_out_deps_total, m_out_deps, -1, 1, 0, 0);
        }

        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
                return false;
            }
            report_coi_error(c_event_wait, res);
        }
    }

    // destroy buffers
    {
        OffloadTimer timer(get_timer_data(), c_offload_host_destroy_buffers);

        for (BufferList::const_iterator it = m_destroy_buffers.begin();
             it != m_destroy_buffers.end(); it++) {
            res = COI::BufferDestroy(*it);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_destroy, res);
            }
        }
    }

    return true;
}

void OffloadDescriptor::cleanup()
{
    // release device in orsl
    ORSL::release(m_device.get_logical_index());

    OFFLOAD_TIMER_STOP(get_timer_data(), c_offload_host_total_offload);

    // report stuff
    Offload_Report_Epilog(get_timer_data());
}

bool OffloadDescriptor::is_signaled()
{
    bool signaled = true;
    COIRESULT res;

    // check compute and receive dependencies
    if (m_in_deps_total > 0) {
        res = COI::EventWait(m_in_deps_total, m_in_deps, 0, 1, 0, 0);
        signaled = signaled && (res == COI_SUCCESS);
    }
    if (m_out_deps_total > 0) {
        res = COI::EventWait(m_out_deps_total, m_out_deps, 0, 1, 0, 0);
        signaled = signaled && (res == COI_SUCCESS);
    }

    return signaled;
}

// Send pointer data if source or destination or both of them are
// noncontiguous. There is guarantee that length of destination enough for
// transfered data.
bool OffloadDescriptor::send_noncontiguous_pointer_data(
    int i,
    PtrData* src_data,
    PtrData* dst_data,
    COIEVENT *event
    )
{
    int64_t offset_src, offset_dst;
    int64_t length_src, length_dst;
    int64_t length_src_cur, length_dst_cur;
    int64_t send_size, data_sent = 0;
    COIRESULT res;
    bool dst_is_empty = true;
    bool src_is_empty = true;

    // Set length_src and length_dst
    length_src = (m_vars_extra[i].read_rng_src) ?
        m_vars_extra[i].read_rng_src->range_size : m_vars[i].size;
    length_dst = !m_vars[i].into ? length_src :
                     (m_vars_extra[i].read_rng_dst) ?
                     m_vars_extra[i].read_rng_dst->range_size : m_vars[i].size;
    send_size = (length_src < length_dst) ? length_src : length_dst;

    // consequently get contiguous ranges,
    // define corresponded destination offset and send data
    do {
        if (src_is_empty) {
            if (m_vars_extra[i].read_rng_src) {
                if (!get_next_range(m_vars_extra[i].read_rng_src,
                         &offset_src)) {
                    // source ranges are over - nothing to send
                    break;
                }
            }
            else if (data_sent == 0) {
                offset_src = m_vars_extra[i].cpu_disp;
            }
            else {
                break;
            }
            length_src_cur = length_src;
        }
        else {
            // if source is contiguous or its contiguous range is greater
            // than destination one
            offset_src += send_size;
        }
        length_src_cur -= send_size;
        src_is_empty = length_src_cur == 0;

        if (dst_is_empty) {
            if (m_vars[i].into) {
                if (m_vars_extra[i].read_rng_dst) {
                    if (!get_next_range(m_vars_extra[i].read_rng_dst,
                             &offset_dst)) {
                        // destination ranges are over
                        LIBOFFLOAD_ERROR(c_destination_is_over);
                        return false;
                    }
                }
                // into is contiguous.
                else {
                    offset_dst = m_vars[i].disp;
                }
                length_dst_cur = length_dst;
            }
            // same as source
            else {
                offset_dst = offset_src;
                length_dst_cur = length_src;
            }
        }
        else {
            // if destination is contiguous or its contiguous range is greater
            // than source one
            offset_dst += send_size;
        }
        length_dst_cur -= send_size;
        dst_is_empty = length_dst_cur == 0;

        if (src_data != 0 && src_data->cpu_buf != 0) {
            res = COI::BufferCopy(
                dst_data->mic_buf,
                src_data->cpu_buf,
                m_vars[i].mic_offset - dst_data->alloc_disp +
                m_vars[i].offset + offset_dst,
                m_vars_extra[i].cpu_offset + offset_src,
                send_size,
                COI_COPY_UNSPECIFIED,
                0, 0,
                event);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_copy, res);
            }
        }
        else {
            char *base = offload_get_src_base(m_vars[i].ptr,
                m_vars[i].type.src);

            res = COI::BufferWrite(
                dst_data->mic_buf,
                m_vars[i].mic_offset - dst_data->alloc_disp +
                m_vars[i].offset + offset_dst,
                base + offset_src,
                send_size,
                COI_COPY_UNSPECIFIED,
                0, 0,
                event);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_write, res);
            }
        }
        data_sent += length_src;
    }
    while (true);
    return true;
}

bool OffloadDescriptor::send_pointer_data(bool is_async)
{
    OffloadTimer timer(get_timer_data(), c_offload_host_send_pointers);

    uint64_t ptr_sent = 0;
    COIRESULT res;

    // Initiate send for pointer data
    for (int i = 0; i < m_vars_total; i++) {
        switch (m_vars[i].type.dst) {
            case c_data_ptr_array:
                break;
            case c_data:
            case c_void_ptr:
            case c_cean_var:
                if (m_vars[i].direction.in &&
                    m_vars[i].flags.is_static_dstn) {
                    COIEVENT *event =
                        (is_async ||
                         m_vars[i].size >= __offload_use_async_buffer_write) ?
                        &m_in_deps[m_in_deps_total++] : 0;
                    PtrData* dst_data = m_vars[i].into ?
                                            m_vars_extra[i].dst_data :
                                            m_vars_extra[i].src_data;
                    PtrData* src_data =
                        VAR_TYPE_IS_PTR(m_vars[i].type.src) ||
                        VAR_TYPE_IS_SCALAR(m_vars[i].type.src) &&
                        m_vars[i].flags.is_static ?
                           m_vars_extra[i].src_data : 0;

                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        if (!send_noncontiguous_pointer_data(
                                i, src_data, dst_data, event)) {
                            return false;
                        }
                    }
                    else if (src_data != 0 && src_data->cpu_buf != 0) {
                        res = COI::BufferCopy(
                            dst_data->mic_buf,
                            src_data->cpu_buf,
                            m_vars[i].mic_offset - dst_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                        char *base = offload_get_src_base(m_vars[i].ptr,
                                                          m_vars[i].type.src);
                        res = COI::BufferWrite(
                            dst_data->mic_buf,
                            m_vars[i].mic_offset - dst_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            base + m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_write, res);
                        }
                    }
                    ptr_sent += m_vars[i].size;
                }
                break;

            case c_string_ptr:
            case c_data_ptr:
            case c_cean_var_ptr:
            case c_dv_ptr:
                if (m_vars[i].direction.in && m_vars[i].size > 0) {
                    COIEVENT *event =
                        (is_async ||
                         m_vars[i].size >= __offload_use_async_buffer_write) ?
                        &m_in_deps[m_in_deps_total++] : 0;
                    PtrData* dst_data = m_vars[i].into ?
                                            m_vars_extra[i].dst_data :
                                            m_vars_extra[i].src_data;
                    PtrData* src_data =
                        VAR_TYPE_IS_PTR(m_vars[i].type.src) ||
                        VAR_TYPE_IS_SCALAR(m_vars[i].type.src) &&
                        m_vars[i].flags.is_static ?
                            m_vars_extra[i].src_data : 0;

                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        send_noncontiguous_pointer_data(
                            i, src_data, dst_data, event);
                    }
                    else if (src_data != 0 && src_data->cpu_buf != 0) {
                        res = COI::BufferCopy(
                            dst_data->mic_buf,
                            src_data->cpu_buf,
                            m_vars[i].mic_offset - dst_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                        char *base = offload_get_src_base(m_vars[i].ptr,
                                                          m_vars[i].type.src);
                        res = COI::BufferWrite(
                            dst_data->mic_buf,
                            m_vars[i].mic_offset - dst_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            base + m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_write, res);
                        }
                    }

                    ptr_sent += m_vars[i].size;
                }
                break;

            case c_dv_data:
            case c_dv_ptr_data:
                if (m_vars[i].direction.in &&
                    m_vars[i].size > 0) {
                    PtrData *ptr_data = m_vars[i].into ?
                                        m_vars_extra[i].dst_data :
                                        m_vars_extra[i].src_data;
                    PtrData* src_data = m_vars_extra[i].src_data;

                    COIEVENT *event =
                        (is_async ||
                         m_vars[i].size >= __offload_use_async_buffer_write) ?
                        &m_in_deps[m_in_deps_total++] : 0;

                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        send_noncontiguous_pointer_data(
                            i, src_data, ptr_data, event);
                    }
                    else if (src_data && src_data->cpu_buf != 0) {
                        res = COI::BufferCopy(
                            ptr_data->mic_buf,
                            src_data->cpu_buf,
                            m_vars[i].offset + ptr_data->mic_offset -
                            ptr_data->alloc_disp +
                            m_vars[i].disp,
                            m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                        char *base = offload_get_src_base(m_vars[i].ptr,
                                                          m_vars[i].type.src);
                        res = COI::BufferWrite(
                            ptr_data->mic_buf,
                            ptr_data->mic_offset - ptr_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            base + m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_write, res);
                        }
                    }
                    ptr_sent += m_vars[i].size;
                }
                break;

            case c_dv_data_slice:
            case c_dv_ptr_data_slice:
                if (m_vars[i].direction.in &&
                    m_vars[i].size > 0) {
                    PtrData *dst_data = m_vars[i].into ?
                                        m_vars_extra[i].dst_data :
                                        m_vars_extra[i].src_data;
                    PtrData* src_data =
                        (VAR_TYPE_IS_PTR(m_vars[i].type.src) ||
                        VAR_TYPE_IS_DV_DATA(m_vars[i].type.src) ||
                        VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.src) ||
                        VAR_TYPE_IS_SCALAR(m_vars[i].type.src) &&
                        m_vars[i].flags.is_static) ?
                            m_vars_extra[i].src_data : 0;
                    COIEVENT *event =
                        (is_async ||
                         m_vars[i].size >= __offload_use_async_buffer_write) ?
                        &m_in_deps[m_in_deps_total++] : 0;
                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        send_noncontiguous_pointer_data(
                            i, src_data, dst_data, event);
                    }
                    else if (src_data && src_data->cpu_buf != 0) {
                        res = COI::BufferCopy(
                            dst_data->mic_buf,
                            src_data->cpu_buf,
                            m_vars[i].offset - dst_data->alloc_disp +
                            dst_data->mic_offset +
                            m_vars[i].disp,
                            m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                        char *base = offload_get_src_base(m_vars[i].ptr,
                                                          m_vars[i].type.src);
                        res = COI::BufferWrite(
                            dst_data->mic_buf,
                            dst_data->mic_offset - dst_data->alloc_disp +
                            m_vars[i].offset + m_vars[i].disp,
                            base + m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            0, 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_write, res);
                        }
                    }

                    ptr_sent += m_vars[i].size;
                }
                break;

            default:
                break;
        }

        // alloc field isn't used at target.
        // We can reuse it for offset of array pointers.
        if (m_vars_extra[i].is_arr_ptr_el) {
            m_vars[i].ptr_arr_offset = m_vars_extra[i].ptr_arr_offset;
        }
    }

    if (m_status) {
        m_status->data_sent += ptr_sent;
    }

    OFFLOAD_TIMER_HOST_SDATA(get_timer_data(), ptr_sent);
    OFFLOAD_DEBUG_TRACE_1(1, GET_OFFLOAD_NUMBER(get_timer_data()),
                  c_offload_sent_pointer_data,
                  "Total pointer data sent to target: [%lld] bytes\n",
                  ptr_sent);

    return true;
}

bool OffloadDescriptor::gather_copyin_data()
{
    OffloadTimer timer(get_timer_data(), c_offload_host_gather_inputs);

    if (m_need_runfunction && m_in_datalen > 0) {
        COIMAPINSTANCE map_inst;
        char *data;

        // init marshaller
        if (m_inout_buf != 0) {
            OffloadTimer timer_map(get_timer_data(),
                                   c_offload_host_map_in_data_buffer);

            COIRESULT res = COI::BufferMap(m_inout_buf, 0, m_in_datalen,
                                           COI_MAP_WRITE_ENTIRE_BUFFER,
                                           0, 0, 0, &map_inst,
                                           reinterpret_cast<void**>(&data));
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_map, res);
            }
        }
        else {
            data = (char*) m_func_desc + m_func_desc->data_offset;
        }

        // send variable descriptors
        memcpy(data, m_vars, m_vars_total * sizeof(VarDesc));
        data += m_vars_total * sizeof(VarDesc);

        // init marshaller
        m_in.init_buffer(data, m_in_datalen);

        // Gather copy data into buffer
        for (int i = 0; i < m_vars_total; i++) {
            bool src_is_for_mic = (m_vars[i].direction.out ||
                                   m_vars[i].into == NULL);
            PtrData* ptr_data = src_is_for_mic ?
                                m_vars_extra[i].src_data :
                                m_vars_extra[i].dst_data;
            if (m_vars[i].flags.alloc_disp) {
                m_in.send_data(&ptr_data->alloc_disp,
                               sizeof(ptr_data->alloc_disp));
            }

            // send sink address to the target
            if (m_vars[i].flags.sink_addr) {
                m_in.send_data(&ptr_data->mic_addr,
                               sizeof(ptr_data->mic_addr));
            }

            switch (m_vars[i].type.dst) {
                case c_data_ptr_array:
                    break;
                case c_data:
                case c_void_ptr:
                case c_cean_var:
                    if (m_vars[i].direction.in &&
                        !m_vars[i].flags.is_static_dstn) {

                        char *ptr = offload_get_src_base(m_vars[i].ptr,
                                                         m_vars[i].type.src);
                        if (m_vars[i].type.dst == c_cean_var) {
                            // offset and length are derived from the array
                            // descriptor
                            int64_t size = m_vars[i].size;
                            int64_t disp = m_vars[i].disp;
                            m_in.send_data(reinterpret_cast<char*>(&size),
                                           sizeof(int64_t));
                            m_in.send_data(reinterpret_cast<char*>(&disp),
                                           sizeof(int64_t));
                        }

                        m_in.send_data(ptr + m_vars_extra[i].cpu_disp,
                                       m_vars[i].size);
                    }
                    break;

                case c_dv:
                    if (m_vars[i].direction.bits ||
                        m_vars[i].alloc_if ||
                        m_vars[i].free_if) {
                        // send dope vector excluding base
                        char *ptr = static_cast<char*>(m_vars[i].ptr);
                        m_in.send_data(ptr + sizeof(uint64_t),
                                       m_vars[i].size - sizeof(uint64_t));
                    }
                    break;

                case c_data_ptr:
                    // send to target addresses of obsolete
                    // stacks to be released
                    if (m_vars[i].flags.is_stack_buf &&
                        !m_vars[i].direction.bits &&
                        m_vars[i].alloc_if &&
                        m_vars[i].size != 0) {
                        for (PtrDataList::iterator it =
                            m_destroy_stack.begin();
                            it != m_destroy_stack.end(); it++) {
                            PtrData * ptr_data = *it;
                            m_in.send_data(&(ptr_data->mic_addr),
                                sizeof(ptr_data->mic_addr));
                        }
                    }
                    break;
                case c_func_ptr:
                    if (m_vars[i].direction.in) {
                        m_in.send_func_ptr(*((const void**) m_vars[i].ptr));
                    }
                    break;

                default:
                    break;
            }
        }

        if (m_status) {
            m_status->data_sent += m_in.get_tfr_size();
        }

        if (m_func_desc->data_offset == 0) {
            OffloadTimer timer_unmap(get_timer_data(),
                                     c_offload_host_unmap_in_data_buffer);
            COIRESULT res = COI::BufferUnmap(map_inst, 0, 0, 0);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_unmap, res);
            }
        }
    }

    OFFLOAD_TIMER_HOST_SDATA(get_timer_data(), m_in.get_tfr_size());
    OFFLOAD_DEBUG_TRACE_1(1,
                  GET_OFFLOAD_NUMBER(get_timer_data()), c_offload_copyin_data,
                  "Total copyin data sent to target: [%lld] bytes\n",
                  m_in.get_tfr_size());

    return true;
}

bool OffloadDescriptor::compute()
{
    OffloadTimer timer(get_timer_data(), c_offload_host_start_compute);

    if (m_need_runfunction) {
        OFFLOAD_DEBUG_TRACE_1(2, GET_OFFLOAD_NUMBER(get_timer_data()),
                              c_offload_compute, "Compute task on MIC\n");

        void* misc = m_func_desc;
        int   misc_len = m_func_desc_size;
        void* ret = 0;
        int   ret_len = 0;

        if (m_func_desc->data_offset != 0) {
            misc_len += m_in_datalen;

            if (m_out_datalen > 0) {
                ret = (char*) m_func_desc + m_func_desc->data_offset;
                ret_len = m_out_datalen;
            }
        }

        // dispatch task
        COIRESULT res;
        COIEVENT event;
        res = m_device.compute(m_compute_buffers,
                               misc, misc_len,
                               ret, ret_len,
                               m_in_deps_total,
                               m_in_deps_total > 0 ? m_in_deps : 0,
                               &event);
        if (res != COI_SUCCESS) {
            if (m_status != 0) {
                m_status->result = translate_coi_error(res);
                return false;
            }
            report_coi_error(c_pipeline_run_func, res);
        }

        m_in_deps_total = 1;
        m_in_deps[0] = event;
    }

    return true;
}

// recieve pointer data if source or destination or both of them are
// noncontiguous. There is guarantee that length of destination enough for
// transfered data.
bool OffloadDescriptor::recieve_noncontiguous_pointer_data(
    int i,
    char* base,
    COIBUFFER dst_buf,
    COIEVENT *event
)
{
    int64_t offset_src, offset_dst;
    int64_t length_src, length_dst;
    int64_t length_src_cur, length_dst_cur;
    int64_t recieve_size, data_recieved = 0;
    COIRESULT res;
    bool dst_is_empty = true;
    bool src_is_empty = true;

    // Set length_src and length_dst
    length_src = (m_vars_extra[i].read_rng_src) ?
        m_vars_extra[i].read_rng_src->range_size : m_vars[i].size;
    length_dst = !m_vars[i].into ? length_src :
                     (m_vars_extra[i].read_rng_dst) ?
                     m_vars_extra[i].read_rng_dst->range_size : m_vars[i].size;
    recieve_size = (length_src < length_dst) ? length_src : length_dst;

    // consequently get contiguous ranges,
    // define corresponded destination offset and recieve data
    do {
        // get sorce offset
        if (src_is_empty) {
            if (m_vars_extra[i].read_rng_src) {
                if (!get_next_range(m_vars_extra[i].read_rng_src,
                         &offset_src)) {
                    // source ranges are over - nothing to send
                    break;
                }
            }
            else if (data_recieved == 0) {
                offset_src = 0;
            }
            else {
                break;
            }
            length_src_cur = length_src;
        }
        else {
            // if source is contiguous or its contiguous range is greater
            // than destination one
            offset_src += recieve_size;
        }
        length_src_cur -= recieve_size;
        src_is_empty = length_src_cur == 0;

        // get destination offset
        if (dst_is_empty) {
            if (m_vars[i].into) {
                if (m_vars_extra[i].read_rng_dst) {
                    if (!get_next_range(m_vars_extra[i].read_rng_dst,
                             &offset_dst)) {
                        // destination ranges are over
                        LIBOFFLOAD_ERROR(c_destination_is_over);
                        return false;
                    }
                }
                // destination is contiguous.
                else {
                    offset_dst = m_vars_extra[i].cpu_disp;
                }
                length_dst_cur = length_dst;
            }
            // same as source
            else {
                offset_dst = offset_src;
                length_dst_cur = length_src;
            }
        }
        else {
            // if destination is contiguous or its contiguous range is greater
            // than source one
            offset_dst += recieve_size;
        }
        length_dst_cur -= recieve_size;
        dst_is_empty = length_dst_cur == 0;

        if (dst_buf != 0) {
            res = COI::BufferCopy(
                dst_buf,
                m_vars_extra[i].src_data->mic_buf,
                m_vars_extra[i].cpu_offset + offset_dst,
                m_vars[i].offset + offset_src +
                m_vars[i].mic_offset -
                m_vars_extra[i].src_data->alloc_disp,
                recieve_size,
                COI_COPY_UNSPECIFIED,
                m_in_deps_total,
                m_in_deps_total > 0 ? m_in_deps : 0,
                event);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_copy, res);
            }
        }
        else {
            res = COI::BufferRead(
                m_vars_extra[i].src_data->mic_buf,
                m_vars[i].offset + offset_src +
                m_vars[i].mic_offset -
                m_vars_extra[i].src_data->alloc_disp,
                base + offset_dst,
                recieve_size,
                COI_COPY_UNSPECIFIED,
                m_in_deps_total,
                m_in_deps_total > 0 ? m_in_deps : 0,
                event);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_read, res);
            }
        }
        data_recieved += recieve_size;
    }
    while (true);
    return true;
}

bool OffloadDescriptor::receive_pointer_data(bool is_async)
{
    OffloadTimer timer(get_timer_data(), c_offload_host_start_buffers_reads);

    uint64_t ptr_received = 0;
    COIRESULT res;

    for (int i = 0; i < m_vars_total; i++) {
        switch (m_vars[i].type.src) {
            case c_data_ptr_array:
                break;
            case c_data:
            case c_void_ptr:
            case c_cean_var:
                if (m_vars[i].direction.out &&
                    m_vars[i].flags.is_static) {
                    COIEVENT *event =
                        (is_async ||
                         m_in_deps_total > 0 ||
                         m_vars[i].size >= __offload_use_async_buffer_read) ?
                        &m_out_deps[m_out_deps_total++] : 0;
                    PtrData *ptr_data = NULL;
                    COIBUFFER dst_buf = NULL; // buffer at host
                    char *base;

                    if (VAR_TYPE_IS_PTR(m_vars[i].type.dst)) {
                        ptr_data = m_vars[i].into ?
                                   m_vars_extra[i].dst_data :
                                   m_vars_extra[i].src_data;
                    }
                    else if (VAR_TYPE_IS_SCALAR(m_vars[i].type.dst)) {
                        if (m_vars[i].flags.is_static_dstn) {
                            ptr_data = m_vars[i].into ?
                                       m_vars_extra[i].dst_data :
                                       m_vars_extra[i].src_data;
                        }
                    }
                    dst_buf = ptr_data ? ptr_data->cpu_buf : NULL;
                    if (dst_buf == NULL) {
                        base = offload_get_src_base(
                            m_vars[i].into ?
                            static_cast<char*>(m_vars[i].into) :
                            static_cast<char*>(m_vars[i].ptr),
                            m_vars[i].type.dst);
                    }

                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        recieve_noncontiguous_pointer_data(
                            i, base, dst_buf, event);
                    }
                    else if (dst_buf != 0) {
                        res = COI::BufferCopy(
                            dst_buf,
                            m_vars_extra[i].src_data->mic_buf,
                            m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].offset + m_vars[i].disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            m_in_deps_total,
                            m_in_deps_total > 0 ? m_in_deps : 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                       res = COI::BufferRead(
                            m_vars_extra[i].src_data->mic_buf,
                            m_vars[i].offset + m_vars[i].disp,
                            base + m_vars_extra[i].cpu_offset +
                            m_vars_extra[i].cpu_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            m_in_deps_total,
                            m_in_deps_total > 0 ? m_in_deps : 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_read, res);
                        }
                    }
                    ptr_received += m_vars[i].size;
                }
                break;

            case c_string_ptr:
            case c_data_ptr:
            case c_cean_var_ptr:
            case c_dv_data:
            case c_dv_ptr_data:
            case c_dv_data_slice:
            case c_dv_ptr_data_slice:
            case c_dv_ptr: {
                COIBUFFER dst_buf = NULL; // buffer on host
                if (m_vars[i].direction.out && m_vars[i].size > 0) {
                    COIEVENT *event =
                        (is_async ||
                         m_in_deps_total > 0 ||
                         m_vars[i].size >= __offload_use_async_buffer_read) ?
                        &m_out_deps[m_out_deps_total++] : 0;

                    uint64_t dst_offset = 0;
                    char *base = static_cast<char*>(m_vars[i].ptr);

                    if (VAR_TYPE_IS_PTR(m_vars[i].type.dst)) {
                        PtrData *ptr_data = m_vars[i].into ?
                                            m_vars_extra[i].dst_data :
                                            m_vars_extra[i].src_data;
                        dst_buf = ptr_data ? ptr_data->cpu_buf : NULL;
                        if (dst_buf == NULL) {
                            base = m_vars[i].into ?
                                   *static_cast<char**>(m_vars[i].into) :
                                   *static_cast<char**>(m_vars[i].ptr);
                        }
                        dst_offset = m_vars_extra[i].cpu_offset +
                                     m_vars_extra[i].cpu_disp;
                    }
                    else if (VAR_TYPE_IS_SCALAR(m_vars[i].type.dst)) {
                        if (m_vars[i].flags.is_static_dstn) {
                            dst_buf = m_vars[i].into ?
                                        m_vars_extra[i].dst_data->cpu_buf :
                                        m_vars_extra[i].src_data->cpu_buf;
                        }
                        if (dst_buf == NULL) {
                            base = offload_get_src_base(
                                m_vars[i].into ?
                                static_cast<char*>(m_vars[i].into) :
                                static_cast<char*>(m_vars[i].ptr),
                                m_vars[i].type.dst);
                        }
                        dst_offset = m_vars_extra[i].cpu_offset +
                                     m_vars_extra[i].cpu_disp;
                    }
                    else if (VAR_TYPE_IS_DV_DATA(m_vars[i].type.dst) ||
                             VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.dst)) {
                        PtrData *ptr_data = m_vars[i].into != 0 ?
                                            m_vars_extra[i].dst_data :
                                            m_vars_extra[i].src_data;
                        dst_buf = ptr_data != 0 ? ptr_data->cpu_buf : 0;
                        if (dst_buf == NULL) {
                            base = offload_get_src_base(
                                m_vars[i].into ?
                                static_cast<char*>(m_vars[i].into) :
                                static_cast<char*>(m_vars[i].ptr),
                                m_vars[i].type.dst);

                        }
                        dst_offset = m_vars_extra[i].cpu_offset +
                                     m_vars_extra[i].cpu_disp;
                    }

                    if (m_vars[i].flags.is_noncont_src ||
                        m_vars[i].flags.is_noncont_dst) {
                        recieve_noncontiguous_pointer_data(
                            i, base, dst_buf, event);
                    }
                    else if (dst_buf != 0) {
                        res = COI::BufferCopy(
                            dst_buf,
                            m_vars_extra[i].src_data->mic_buf,
                            dst_offset,
                            m_vars[i].offset + m_vars[i].disp +
                                m_vars[i].mic_offset -
                                m_vars_extra[i].src_data->alloc_disp,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            m_in_deps_total,
                            m_in_deps_total > 0 ? m_in_deps : 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_copy, res);
                        }
                    }
                    else {
                        res = COI::BufferRead(
                            m_vars_extra[i].src_data->mic_buf,
                            m_vars[i].offset + m_vars[i].disp +
                                m_vars[i].mic_offset -
                                m_vars_extra[i].src_data->alloc_disp,
                            base + dst_offset,
                            m_vars[i].size,
                            COI_COPY_UNSPECIFIED,
                            m_in_deps_total,
                            m_in_deps_total > 0 ? m_in_deps : 0,
                            event);
                        if (res != COI_SUCCESS) {
                            if (m_status != 0) {
                                m_status->result = translate_coi_error(res);
                                return false;
                            }
                            report_coi_error(c_buf_read, res);
                        }
                    }
                    ptr_received += m_vars[i].size;
                }
                break;
            }

            default:
                break;
        }

        // destroy buffers for obsolete stacks
        if (m_destroy_stack.size() != 0) {
            for (PtrDataList::iterator it = m_destroy_stack.begin();
                it != m_destroy_stack.end(); it++) {
                PtrData *ptr_data = *it;
                m_destroy_buffers.push_back(ptr_data->mic_buf);
                OFFLOAD_TRACE(3, "Removing stack buffer with addr %p\n",
                                  ptr_data->mic_addr);
            }
            m_destroy_stack.clear();
        }
        if (m_vars[i].free_if) {
            // remove association for automatic variables
            if (m_is_openmp && !m_vars[i].flags.is_static &&
                (m_vars[i].type.src == c_data ||
                 m_vars[i].type.src == c_void_ptr ||
                 m_vars[i].type.src == c_cean_var)) {
                AutoData *auto_data = m_vars_extra[i].auto_data;
                if (auto_data != 0 && auto_data->remove_reference() == 0) {
                    m_device.remove_auto_data(auto_data->cpu_addr.start());
                }
            }

            // destroy buffers
            if (m_vars[i].direction.out || m_vars[i].into == NULL) {
                if (!VAR_TYPE_IS_PTR(m_vars[i].type.src) &&
                    !VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.src) &&
                    !VAR_TYPE_IS_DV_DATA(m_vars[i].type.src)) {
                    continue;
                }

                PtrData *ptr_data = m_vars_extra[i].src_data;
                if (ptr_data->remove_reference() == 0) {
                    // destroy buffers
                    if (ptr_data->cpu_buf != 0) {
                        m_destroy_buffers.push_back(ptr_data->cpu_buf);
                    }
                    if (ptr_data->mic_buf != 0) {
                        m_destroy_buffers.push_back(ptr_data->mic_buf);
                    }
                    OFFLOAD_TRACE(3, "Removing association for addr %p\n",
                                  ptr_data->cpu_addr.start());

                    // remove association from map
                    m_device.remove_ptr_data(ptr_data->cpu_addr.start());
                }
            }
            else if (VAR_TYPE_IS_PTR(m_vars[i].type.dst) ||
                     VAR_TYPE_IS_DV_DATA_SLICE(m_vars[i].type.dst) ||
                     VAR_TYPE_IS_DV_DATA(m_vars[i].type.dst)) {
                PtrData *ptr_data = m_vars_extra[i].dst_data;
                if (ptr_data->remove_reference() == 0) {
                    // destroy buffers
                    if (ptr_data->cpu_buf != 0) {
                        m_destroy_buffers.push_back(ptr_data->cpu_buf);
                    }
                    if (ptr_data->mic_buf != 0) {
                        m_destroy_buffers.push_back(ptr_data->mic_buf);
                    }
                    OFFLOAD_TRACE(3, "Removing association for addr %p\n",
                                  ptr_data->cpu_addr.start());

                    // remove association from map
                    m_device.remove_ptr_data(ptr_data->cpu_addr.start());
                }
            }
        }
    }

    if (m_status) {
        m_status->data_received += ptr_received;
    }

    OFFLOAD_TIMER_HOST_RDATA(get_timer_data(), ptr_received);
    OFFLOAD_DEBUG_TRACE_1(1, GET_OFFLOAD_NUMBER(get_timer_data()),
                  c_offload_received_pointer_data,
                  "Total pointer data received from target: [%lld] bytes\n",
                  ptr_received);

    return true;
}

bool OffloadDescriptor::scatter_copyout_data()
{
    OffloadTimer timer(get_timer_data(), c_offload_host_scatter_outputs);

    if (m_need_runfunction && m_out_datalen > 0) {

        // total size that need to be transferred from target to host
        COIMAPINSTANCE map_inst;
        COIRESULT res;
        char *data;

        // output data buffer
        if (m_func_desc->data_offset == 0) {
            OffloadTimer timer_map(get_timer_data(),
                                   c_offload_host_map_out_data_buffer);

            COIRESULT res = COI::BufferMap(m_inout_buf, 0, m_out_datalen,
                                           COI_MAP_READ_ONLY, 0, 0, 0,
                                           &map_inst,
                                            reinterpret_cast<void**>(&data));
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_map, res);
            }
        }
        else {
            data = (char*) m_func_desc + m_func_desc->data_offset;
        }

        // get timing data
        OFFLOAD_TIMER_TARGET_DATA(get_timer_data(), data);
        data += OFFLOAD_TIMER_DATALEN();

        // initialize output marshaller
        m_out.init_buffer(data, m_out_datalen);

        for (int i = 0; i < m_vars_total; i++) {
            switch (m_vars[i].type.src) {
                case c_data_ptr_array:
                    break;
                case c_data:
                case c_void_ptr:
                case c_cean_var:
                    if (m_vars[i].direction.out &&
                        !m_vars[i].flags.is_static) {

                        if (m_vars[i].into) {
                            char *ptr = offload_get_src_base(
                                static_cast<char*>(m_vars[i].into),
                                m_vars[i].type.dst);
                            m_out.receive_data(ptr + m_vars_extra[i].cpu_disp,
                                               m_vars[i].size);
                        }
                        else {
                            m_out.receive_data(
                                static_cast<char*>(m_vars[i].ptr) +
                                    m_vars_extra[i].cpu_disp,
                                m_vars[i].size);
                        }
                    }
                    break;

                case c_func_ptr:
                    if (m_vars[i].direction.out) {
                        m_out.receive_func_ptr((const void**) m_vars[i].ptr);
                    }
                    break;

                default:
                    break;
            }
        }

        if (m_status) {
            m_status->data_received += m_out.get_tfr_size();
        }

        if (m_func_desc->data_offset == 0) {
            OffloadTimer timer_unmap(get_timer_data(),
                                     c_offload_host_unmap_out_data_buffer);

            COIRESULT res = COI::BufferUnmap(map_inst, 0, 0, 0);
            if (res != COI_SUCCESS) {
                if (m_status != 0) {
                    m_status->result = translate_coi_error(res);
                    return false;
                }
                report_coi_error(c_buf_unmap, res);
            }
        }
    }

    OFFLOAD_TIMER_HOST_RDATA(get_timer_data(), m_out.get_tfr_size());
    OFFLOAD_TRACE(1, "Total copyout data received from target: [%lld] bytes\n",
                  m_out.get_tfr_size());

    return true;
}

void get_arr_desc_numbers(
    const arr_desc *ap,
    int64_t el_size,
    int64_t &offset,
    int64_t &size,
    int     &el_number,
    CeanReadRanges* &ptr_ranges
)
{
    if (is_arr_desc_contiguous(ap)) {
        ptr_ranges = NULL;
        __arr_data_offset_and_length(ap, offset, size);
        el_number = size / el_size;
    }
    else {
        ptr_ranges = init_read_ranges_arr_desc(ap);
        el_number = (ptr_ranges->range_size / el_size) *
                    ptr_ranges->range_max_number;
        size = ptr_ranges->range_size;
    }
}

arr_desc * make_arr_desc(
    void*   ptr_val,
    int64_t extent_start_val,
    int64_t extent_elements_val,
    int64_t size
)
{
    arr_desc *res;
    res = (arr_desc *)malloc(sizeof(arr_desc));
    if (res == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    res->base = reinterpret_cast<int64_t>(ptr_val);
    res->rank = 1;
    res->dim[0].size = size;
    res->dim[0].lindex = 0;
    res->dim[0].lower = extent_start_val;
    res->dim[0].upper = extent_elements_val + extent_start_val - 1;
    res->dim[0].stride = 1;
    return res;
}

bool OffloadDescriptor::gen_var_descs_for_pointer_array(int i)
{
    int             pointers_number;
    int             tmp_val;
    int             new_index = m_vars_total;
    const arr_desc *ap;
    const VarDesc3 *vd3 = static_cast<const VarDesc3*>(m_vars[i].ptr);
    int             flags = vd3->array_fields;
    bool            src_is_for_mic = (m_vars[i].direction.out ||
                                      m_vars[i].into == NULL);

    ReadArrElements<void *>  ptr;
    ReadArrElements<void *>  into;
    ReadArrElements<int64_t> ext_start;
    ReadArrElements<int64_t> ext_elements;
    ReadArrElements<int64_t> align;
    ReadArrElements<int64_t> alloc_if;
    ReadArrElements<int64_t> free_if;
    ReadArrElements<int64_t> into_start;
    ReadArrElements<int64_t> into_elem;
    ReadArrElements<int64_t> alloc_start;
    ReadArrElements<int64_t> alloc_elem;


    ap = static_cast<const arr_desc*>(vd3->ptr_array);

    // "pointers_number" for total number of transfered pointers.
    // For each of them we create new var_desc and put it at the bottom
    // of the var_desc's array
    get_arr_desc_numbers(ap, sizeof(void *), ptr.offset, ptr.size,
        pointers_number, ptr.ranges);
    ptr.base = reinterpret_cast<char*>(ap->base);

    // 2. prepare memory for new var_descs
    m_vars_total += pointers_number;
    m_vars       = (VarDesc*)realloc(m_vars, m_vars_total * sizeof(VarDesc));
    if (m_vars == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    m_vars_extra =
        (VarExtra*)realloc(m_vars_extra, m_vars_total * sizeof(VarExtra));
    if (m_vars_extra == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    m_in_deps    =
        (COIEVENT*)realloc(m_in_deps, sizeof(COIEVENT) * (m_vars_total + 1));
    if (m_in_deps == NULL)
      LIBOFFLOAD_ERROR(c_malloc);
    m_out_deps   =
        (COIEVENT*)realloc(m_out_deps, sizeof(COIEVENT) * m_vars_total);
    if (m_out_deps == NULL)
      LIBOFFLOAD_ERROR(c_malloc);

    // 3. Prepare for reading new var_desc's fields
    //    EXTENT START
    if ((flags & (1<<flag_extent_start_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->extent_start);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, ext_start.offset,
            ext_start.size, tmp_val, ext_start.ranges);
        ext_start.base = reinterpret_cast<char*>(ap->base);
        ext_start.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "extent start");
            return false;
        }
    }
    else if ((flags & (1<<flag_extent_start_is_scalar)) != 0) {
        ext_start.val = (int64_t)vd3->extent_start;
    }
    else {
        ext_start.val = 0;
    }

    //    EXTENT ELEMENTS NUMBER
    if ((flags & (1<<flag_extent_elements_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->extent_elements);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size,
            ext_elements.offset, ext_elements.size,
            tmp_val, ext_elements.ranges);
        ext_elements.base = reinterpret_cast<char*>(ap->base);
        ext_elements.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "extent elements");
            return false;
        }
    }
    else if ((flags & (1<<flag_extent_elements_is_scalar)) != 0) {
        ext_elements.val = (int64_t)vd3->extent_elements;
    }
    else {
        ext_elements.val = m_vars[i].count;
    }

    //    ALLOC_IF
    if ((flags & (1<<flag_alloc_if_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->alloc_if_array);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, alloc_if.offset,
            alloc_if.size, tmp_val, alloc_if.ranges);
        alloc_if.base = reinterpret_cast<char*>(ap->base);
        alloc_if.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "alloc_if");
            return false;
        }
    }
    else {
        alloc_if.val = m_vars[i].count;
    }

    //    FREE_IF
    if ((flags & (1<<flag_free_if_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->free_if_array);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, free_if.offset,
            free_if.size, tmp_val, free_if.ranges);
        free_if.base = reinterpret_cast<char*>(ap->base);
        free_if.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "free_if");
            return false;
        }
    }
    else {
        free_if.val = m_vars[i].count;
    }

    //    ALIGN

    if ((flags & (1<<flag_align_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->align_array);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, align.offset,
            align.size, tmp_val, align.ranges);
        align.base = reinterpret_cast<char*>(ap->base);
        align.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "align");
            return false;
        }
    }
    else {
        align.val = m_vars[i].align;
    }

    // 3.1 INTO

    if (m_vars[i].into) {
        ap = static_cast<const arr_desc*>(m_vars[i].into);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, into.offset,
            into.size, tmp_val, into.ranges);
        into.base = reinterpret_cast<char*>(ap->base);

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into");
            return false;
        }
    }

    // 3.2 INTO_START

    if ((flags & (1<<flag_into_start_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->into_start);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, into_start.offset,
            into_start.size, tmp_val, into_start.ranges);
        into_start.base = reinterpret_cast<char*>(ap->base);
        into_start.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into_extent start");
            return false;
        }
    }
    else if ((flags & (1<<flag_into_start_is_scalar)) != 0) {
        into_start.val = (int64_t)vd3->into_start;
    }
    else {
        into_start.val = 0;
    }

    // 3.3 INTO_ELEMENTS

    if ((flags & (1<<flag_into_elements_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->into_elements);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, into_elem.offset,
            into_elem.size, tmp_val, into_elem.ranges);
        into_elem.base = reinterpret_cast<char*>(ap->base);
        into_elem.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into_extent elements");
            return false;
        }
    }
    else if ((flags & (1<<flag_into_elements_is_scalar)) != 0) {
        into_elem.val = (int64_t)vd3->into_elements;
    }
    else {
        into_elem.val = m_vars[i].count;
    }

    //    alloc_start

    if ((flags & (1<<flag_alloc_start_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->alloc_start);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size,
            alloc_start.offset, alloc_start.size, tmp_val,
            alloc_start.ranges);
        alloc_start.base = reinterpret_cast<char*>(ap->base);
        alloc_start.el_size = ap->dim[ap->rank - 1].size;

        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "alloc_extent start");
            return false;
        }
    }
    else if ((flags & (1<<flag_alloc_start_is_scalar)) != 0) {
        alloc_start.val = (int64_t)vd3->alloc_start;
    }
    else {
        alloc_start.val = 0;
    }

    //    alloc_elem

    if ((flags & (1<<flag_alloc_elements_is_array)) != 0) {
        ap = static_cast<const arr_desc*>(vd3->alloc_elements);
        get_arr_desc_numbers(ap, ap->dim[ap->rank - 1].size, alloc_elem.offset,
            alloc_elem.size, tmp_val, alloc_elem.ranges);
        alloc_elem.base = reinterpret_cast<char*>(ap->base);
        alloc_elem.el_size = ap->dim[ap->rank - 1].size;
        if (tmp_val < pointers_number) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch,
                             "alloc_extent elements");
            return false;
        }
    }
    else if ((flags & (1<<flag_alloc_elements_is_scalar)) != 0) {
        alloc_elem.val = (int64_t)vd3->alloc_elements;
    }
    else {
        alloc_elem.val = 0;
    }

    for (int k = 0; k < pointers_number; k++) {
        int type = flags & 0x3f;
        int type_src, type_dst;
        //  Get new values
        // type_src, type_dst
        type_src = type_dst = (type == c_data_ptr_array) ?
                              c_data_ptr   : (type == c_func_ptr_array) ?
                              c_func_ptr   : (type == c_void_ptr_array) ?
                              c_void_ptr   : (type == c_string_ptr_array) ?
                              c_string_ptr : 0;

        // Get ptr val
        if (!ptr.read_next(true)) {
            break;
        }
        else {
            ptr.val = (void*)(ptr.base + ptr.offset);
        }

        // !!! If we got error at phase of reading - it's an internal
        // !!! error, as we must detect mismatch before

        // Get into val
        if (m_vars[i].into) {
            if (!into.read_next(true)) {
                LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into");
                LIBOFFLOAD_ABORT;
            }
            else {
                into.val = (void*)(into.base + into.offset);
            }
        }

        // Get other components of the clause
        if (!ext_start.read_next(flags & (1<<flag_extent_start_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "extent start");
            LIBOFFLOAD_ABORT;
        }
        if (!ext_elements.read_next(
                flags & (1<<flag_extent_elements_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "extent elements");
            LIBOFFLOAD_ABORT;
        }
        if (!alloc_if.read_next(flags & (1<<flag_alloc_if_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "alloc_if");
            LIBOFFLOAD_ABORT;
        }
        if (!free_if.read_next(flags & (1<<flag_free_if_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "free_if");
            LIBOFFLOAD_ABORT;
        }
        if (!align.read_next(flags & (1<<flag_align_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "align");
            LIBOFFLOAD_ABORT;
        }
        if (!into_start.read_next(flags & (1<<flag_into_start_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into_extent start");
            LIBOFFLOAD_ABORT;
        }
        if (!into_elem.read_next(flags & (1<<flag_into_elements_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "into_extent elements");
            LIBOFFLOAD_ABORT;
        }
        if (!alloc_start.read_next(flags & (1<<flag_alloc_start_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "alloc_extent start");
            LIBOFFLOAD_ABORT;
        }
        if (!alloc_elem.read_next(
                 flags & (1<<flag_alloc_elements_is_array))) {
            LIBOFFLOAD_ERROR(c_pointer_array_mismatch, "alloc_extent elements");
            LIBOFFLOAD_ABORT;
        }

        m_vars[new_index + k].direction.bits = m_vars[i].direction.bits;
        m_vars[new_index + k].alloc_if = alloc_if.val;
        m_vars[new_index + k].free_if = free_if.val;
        m_vars[new_index + k].align = align.val;
        m_vars[new_index + k].mic_offset = 0;
        m_vars[new_index + k].flags.bits = m_vars[i].flags.bits;
        m_vars[new_index + k].offset = 0;
        m_vars[new_index + k].size = m_vars[i].size;

        if (ext_start.val == 0) {
            m_vars[new_index + k].count = ext_elements.val;
            m_vars[new_index + k].ptr = ptr.val;
            if (type_src == c_string_ptr) {
                m_vars[new_index + k].size = 0;
            }
        }
        else {
            m_vars[new_index + k].count = 0;
            m_vars[new_index + k].ptr =
                static_cast<void*>(make_arr_desc(
                ptr.val,
                ext_start.val,
                ext_elements.val,
                m_vars[i].size));

            type_src = type_src == c_data_ptr ? c_cean_var_ptr :
                                   c_string_ptr ? c_cean_var_ptr :
                                   type_src;
            if (!m_vars[i].into) {
                type_dst = type_src;
            }
        }

        if (m_vars[i].into && into_elem.val != 0) {
            m_vars[new_index + k].into =
                static_cast<void*>(make_arr_desc(
                into.val,
                into_start.val,
                into_elem.val,
                m_vars[i].size));
            type_dst = (type == c_data_ptr_array) ? c_cean_var_ptr :
                       (type == c_string_ptr_array) ? c_cean_var_ptr :
                        type_src;
        }
        else {
            m_vars[new_index + k].into = NULL;
        }

        if (alloc_elem.val != 0) {
            m_vars[new_index + k].alloc =
                static_cast<void*>(make_arr_desc(
                ptr.val,
                alloc_start.val,
                alloc_elem.val,
                m_vars[i].size));
        }
        else {
            m_vars[new_index + k].alloc = NULL;
        }

        m_vars[new_index + k].type.src = type_src;
        m_vars[new_index + k].type.dst = type_dst;

        m_vars_extra[new_index + k].is_arr_ptr_el = 1;
        m_vars_extra[new_index + k].ptr_arr_offset =
            src_is_for_mic ? ptr.offset : into.offset;
    }
    // count and alloc fields are useless at target. They can be reused
    // for pointer arrays.
    m_vars[i].count = pointers_number;
    m_vars[i].ptr_arr_offset = new_index;
    return true;
}

static void __offload_fini_library(void)
{
    OFFLOAD_DEBUG_TRACE(2, "Cleanup offload library ...\n");
    if (mic_engines_total > 0) {
        delete[] mic_engines;

        if (mic_proxy_fs_root != 0) {
            free(mic_proxy_fs_root);
            mic_proxy_fs_root = 0;
        }

        if (mic_library_path != 0) {
            free(mic_library_path);
            mic_library_path = 0;
        }

        // destroy thread key
        thread_key_delete(mic_thread_key);
    }

    // unload COI library
    if (COI::is_available) {
        COI::fini();
    }

    OFFLOAD_DEBUG_TRACE(2, "Cleanup offload library ... done\n");
}

static void __offload_init_library_once(void)
{
    COIRESULT res;
    uint32_t num_devices;
    std::bitset<MIC_ENGINES_MAX> devices;

    prefix = report_get_message_str(c_report_host);

    // initialize trace
    const char *env_var = getenv(htrace_envname);
    if (env_var != 0 && *env_var != '\0') {
        int64_t new_val;
        if (__offload_parse_int_string(env_var, new_val)) {
            console_enabled = new_val & 0x0f;
        }
    }

    env_var = getenv(offload_report_envname);
    if (env_var != 0 && *env_var != '\0') {
        int64_t env_val;
        if (__offload_parse_int_string(env_var, env_val)) {
            if (env_val == OFFLOAD_REPORT_1 ||
                env_val == OFFLOAD_REPORT_2 ||
                env_val == OFFLOAD_REPORT_3) {
                offload_report_level = env_val;
            }
            else {
                LIBOFFLOAD_ERROR(c_invalid_env_report_value,
                                 offload_report_envname);
            }
        }
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_int_value,
                             offload_report_envname);
        }
    }
    else if (!offload_report_level) {
        env_var = getenv(timer_envname);
        if (env_var != 0 && *env_var != '\0') {
            timer_enabled = atoi(env_var);
        }
    }

    // initialize COI
    if (!COI::init()) {
        return;
    }

    // get number of devices installed in the system
    res = COI::EngineGetCount(COI_ISA_KNC, &num_devices);
    if (res != COI_SUCCESS) {
        return;
    }

    if (num_devices > MIC_ENGINES_MAX) {
        num_devices = MIC_ENGINES_MAX;
    }

    // fill in the list of devices that can be used for offloading
    env_var = getenv("OFFLOAD_DEVICES");
    if (env_var != 0) {
        if (strcasecmp(env_var, "none") != 0) {
            // value is composed of comma separated physical device indexes
            char *buf = strdup(env_var);
            char *str, *ptr;
            for (str = strtok_r(buf, ",", &ptr); str != 0;
                 str = strtok_r(0, ",", &ptr)) {
                // convert string to an int
                int64_t num;
                if (!__offload_parse_int_string(str, num)) {
                    LIBOFFLOAD_ERROR(c_mic_init5);

                    // fallback to using all installed devices
                    devices.reset();
                    for (int i = 0; i < num_devices; i++) {
                        devices.set(i);
                    }
                    break;
                }
                if (num < 0 || num >= num_devices) {
                    LIBOFFLOAD_ERROR(c_mic_init6, num);
                    continue;
                }
                devices.set(num);
            }
            free(buf);
        }
    }
    else {
        // use all available devices
        for (int i = 0; i < num_devices; i++) {
            COIENGINE engine;
            res = COI::EngineGetHandle(COI_ISA_KNC, i, &engine);
            if (res == COI_SUCCESS) {
                devices.set(i);
            }
        }
    }

    mic_engines_total = devices.count();

    // no need to continue if there are no devices to offload to
    if (mic_engines_total <= 0) {
        return;
    }

    // initialize indexes for available devices
    mic_engines = new Engine[mic_engines_total];
    for (int p_idx = 0, l_idx = 0; p_idx < num_devices; p_idx++) {
        if (devices[p_idx]) {
            mic_engines[l_idx].set_indexes(l_idx, p_idx);
            l_idx++;
        }
    }

    // library search path for device binaries
    env_var = getenv("MIC_LD_LIBRARY_PATH");
    if (env_var != 0) {
        mic_library_path = strdup(env_var);
    }

    // memory size reserved for COI buffers
    env_var = getenv("MIC_BUFFERSIZE");
    if (env_var != 0) {
        uint64_t new_size;
        if (__offload_parse_size_string(env_var, new_size)) {
            mic_buffer_size = new_size;
        }
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_value, "MIC_BUFFERSIZE");
        }
    }

    // determine stacksize for the pipeline on the device
    env_var = getenv("MIC_STACKSIZE");
    if (env_var != 0 && *env_var != '\0') {
        uint64_t new_size;
        if (__offload_parse_size_string(env_var, new_size) &&
            (new_size >= 16384) && ((new_size & 4095) == 0)) {
            mic_stack_size = new_size;
        }
        else {
            LIBOFFLOAD_ERROR(c_mic_init3);
        }
    }

    // proxy I/O
    env_var = getenv("MIC_PROXY_IO");
    if (env_var != 0 && *env_var != '\0') {
        int64_t new_val;
        if (__offload_parse_int_string(env_var, new_val)) {
            mic_proxy_io = new_val;
        }
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_int_value, "MIC_PROXY_IO");
        }
    }
    env_var = getenv("MIC_PROXY_FS_ROOT");
    if (env_var != 0 && *env_var != '\0') {
        mic_proxy_fs_root = strdup(env_var);
    }

    // Prepare environment for the target process using the following
    // rules
    // - If MIC_ENV_PREFIX is set then any environment variable on the
    //   host which has that prefix are copied to the device without
    //   the prefix.
    //   All other host environment variables are ignored.
    // - If MIC_ENV_PREFIX is not set or if MIC_ENV_PREFIX="" then host
    //   environment is duplicated.
    env_var = getenv("MIC_ENV_PREFIX");
    if (env_var != 0 && *env_var != '\0') {
        mic_env_vars.set_prefix(env_var);

        int len = strlen(env_var);
        for (int i = 0; environ[i] != 0; i++) {
            if (strncmp(environ[i], env_var, len) == 0 &&
                strncmp(environ[i], "MIC_LD_LIBRARY_PATH", 19) != 0 &&
                environ[i][len] != '=') {
                mic_env_vars.analyze_env_var(environ[i]);
            }
        }
    }

    // create key for thread data
    if (thread_key_create(&mic_thread_key, Engine::destroy_thread_data)) {
        LIBOFFLOAD_ERROR(c_mic_init4, errno);
        return;
    }

    // cpu frequency
    cpu_frequency = COI::PerfGetCycleFrequency();

    env_var = getenv(mic_use_2mb_buffers_envname);
    if (env_var != 0 && *env_var != '\0') {
        uint64_t new_size;
        if (__offload_parse_size_string(env_var, new_size)) {
            __offload_use_2mb_buffers = new_size;
        }
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_value,
                             mic_use_2mb_buffers_envname);
        }
    }

    env_var = getenv(mic_use_async_buffer_write_envname);
    if (env_var != 0 && *env_var != '\0') {
        uint64_t new_size;
        if (__offload_parse_size_string(env_var, new_size)) {
            __offload_use_async_buffer_write = new_size;
        }
    }

    env_var = getenv(mic_use_async_buffer_read_envname);
    if (env_var != 0 && *env_var != '\0') {
        uint64_t new_size;
        if (__offload_parse_size_string(env_var, new_size)) {
            __offload_use_async_buffer_read = new_size;
        }
    }

    // mic initialization type
    env_var = getenv(offload_init_envname);
    if (env_var != 0 && *env_var != '\0') {
        if (strcmp(env_var, "on_offload") == 0) {
            __offload_init_type = c_init_on_offload;
        }
        else if (strcmp(env_var, "on_offload_all") == 0) {
            __offload_init_type = c_init_on_offload_all;
        }
#ifndef TARGET_WINNT
        else if (strcmp(env_var, "on_start") == 0) {
            __offload_init_type = c_init_on_start;
        }
#endif // TARGET_WINNT
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_value, offload_init_envname);
        }
    }

    // active wait
    env_var = getenv(offload_active_wait_envname);
    if (env_var != 0 && *env_var != '\0') {
        int64_t new_val;
        if (__offload_parse_int_string(env_var, new_val)) {
            __offload_active_wait = new_val;
        }
        else {
            LIBOFFLOAD_ERROR(c_invalid_env_var_int_value,
                             offload_active_wait_envname);
        }
    }

    // omp device num
    env_var = getenv(omp_device_num_envname);
    if (env_var != 0 && *env_var != '\0') {
        int64_t new_val;
        if (__offload_parse_int_string(env_var, new_val) && new_val >= 0) {
            __omp_device_num = new_val;
        }
        else {
            LIBOFFLOAD_ERROR(c_omp_invalid_device_num_env,
                             omp_device_num_envname);
        }
    }

    // init ORSL
    ORSL::init();
}

extern int __offload_init_library(void)
{
    // do one time intialization
    static OffloadOnceControl ctrl = OFFLOAD_ONCE_CONTROL_INIT;
    __offload_run_once(&ctrl, __offload_init_library_once);

    // offload is available if COI is available and the number of devices > 0
    bool is_available = COI::is_available && (mic_engines_total > 0);

    // register pending libraries if there are any
    if (is_available && __target_libs) {
        mutex_locker_t locker(__target_libs_lock);

        for (TargetImageList::iterator it = __target_libs_list.begin();
             it != __target_libs_list.end(); it++) {
            // Register library in COI
            COI::ProcessRegisterLibraries(1, &it->data, &it->size,
                                          &it->origin, &it->offset);

            // add lib to all engines
            for (int i = 0; i < mic_engines_total; i++) {
                mic_engines[i].add_lib(*it);
            }
        }

        __target_libs = false;
        __target_libs_list.clear();
    }

    return is_available;
}

extern "C" void __offload_register_image(const void *target_image)
{
    const struct Image *image = static_cast<const struct Image*>(target_image);

    // decode image
    const char *name = image->data;
    const void *data = image->data + strlen(image->data) + 1;
    uint64_t    size = image->size;
    const char *origin = 0;
    uint64_t    offset = 0;

    // our actions depend on the image type
    const Elf64_Ehdr *hdr = static_cast<const Elf64_Ehdr*>(data);
    switch (hdr->e_type) {
        case ET_EXEC:
            // Each offload application is supposed to have only one target
            // image representing target executable.
            // No thread synchronization is required here as the initialization
            // code is always executed in a single thread.
            if (__target_exe != 0) {
                LIBOFFLOAD_ERROR(c_multiple_target_exes);
                exit(1);
            }
            __target_exe = new TargetImage(name, data, size, origin, offset);

            // Registration code for execs is always called from the context
            // of main and thus we can safely call any function here,
            // including LoadLibrary API on windows. This is the place where
            // we do the offload library initialization.
            if (__offload_init_library()) {
                // initialize engine if init_type is on_start
                if (__offload_init_type == c_init_on_start) {
                    for (int i = 0; i < mic_engines_total; i++) {
                        mic_engines[i].init();
                    }
                }
            }
            break;

        case ET_DYN:
            // Registration code for libraries is called from the DllMain
            // context (on windows) and thus we cannot do anything usefull
            // here. So we just add it to the list of pending libraries for
            // the later use.
            __target_libs_lock.lock();
            __target_libs = true;
            __target_libs_list.push_back(TargetImage(name, data, size,
                                                     origin, offset));
            __target_libs_lock.unlock();
            break;

        default:
            // something is definitely wrong, issue an error and exit
            LIBOFFLOAD_ERROR(c_unknown_binary_type);
            exit(1);
    }
}

extern "C" void __offload_unregister_image(const void *target_image)
{
    // Target image is packed as follows:
    //      8 bytes                - size of the target binary
    //      null-terminated string - binary name
    //      <size> bytes           - binary contents
    const struct Image {
         int64_t size;
         char data[];
    } *image = static_cast<const struct Image*>(target_image);

    // decode image
    const char *name = image->data;
    const void *data = image->data + strlen(image->data) + 1;

    // our actions depend on the image type
    const Elf64_Ehdr *hdr = static_cast<const Elf64_Ehdr*>(data);
    if (hdr->e_type == ET_EXEC) {
        // We are executing exec's desctructors.
        // It is time to do a library cleanup.
        if (timer_enabled) {
            Offload_Timer_Print();
        }

#ifdef MYO_SUPPORT
        __offload_myoFini();
#endif // MYO_SUPPORT

        __offload_fini_library();
    }
}

// Runtime trace interface for user programs

void __offload_console_trace(int level)
{
    console_enabled = level;
}

// User-visible offload API

int _Offload_number_of_devices(void)
{
    __offload_init_library();
    return mic_engines_total;
}

int _Offload_get_device_number(void)
{
    return -1;
}

int _Offload_get_physical_device_number(void)
{
    return -1;
}

int _Offload_signaled(int index, void *signal)
{
    __offload_init_library();

    // check index value
    if (index < 0 || mic_engines_total <= 0) {
        LIBOFFLOAD_ERROR(c_offload_signaled1, index);
        LIBOFFLOAD_ABORT;
    }

    // find associated async task
    OffloadDescriptor *task =
        mic_engines[index % mic_engines_total].find_signal(signal, false);
    if (task == 0) {
        LIBOFFLOAD_ERROR(c_offload_signaled2, signal);
        LIBOFFLOAD_ABORT;
    }

    return task->is_signaled();
}

void _Offload_report(int val)
{
    if (val == OFFLOAD_REPORT_ON ||
        val == OFFLOAD_REPORT_OFF) {
        offload_report_enabled = val;
    }
}

// IDB support
int   __dbg_is_attached = 0;
int   __dbg_target_id = -1;
pid_t __dbg_target_so_pid = -1;
char  __dbg_target_exe_name[MAX_TARGET_NAME] = {0};
const int __dbg_api_major_version = 1;
const int __dbg_api_minor_version = 0;

void __dbg_target_so_loaded()
{
}
void __dbg_target_so_unloaded()
{
}