path: root/openmp/offload/src/offload_host.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//


// 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);
    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));
        memcpy(m_vars, vars, m_vars_total * sizeof(VarDesc));
        m_vars_extra = (VarExtra*) malloc(m_vars_total * sizeof(VarExtra));
    }

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

    // 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);
        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));
    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));
    m_vars_extra =
        (VarExtra*)realloc(m_vars_extra, m_vars_total * sizeof(VarExtra));
    m_in_deps    =
        (COIEVENT*)realloc(m_in_deps, sizeof(COIEVENT) * (m_vars_total + 1));
    m_out_deps   =
        (COIEVENT*)realloc(m_out_deps, sizeof(COIEVENT) * m_vars_total);

    // 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()
{
}