PR libstdc++/79980 fix target type of cast

[official-gcc.git] / liboffloadmic / runtime / offload_host.h

/*
    Copyright (c) 2014-2016 Intel Corporation.  All Rights Reserved.

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    modification, are permitted provided that the following conditions
    are met:

      * Redistributions of source code must retain the above copyright
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        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
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        contributors may be used to endorse or promote products derived
        from this software without specific prior written permission.

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    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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    HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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*/


/*! \file
    \brief The parts of the runtime library used only on the host
*/

#ifndef OFFLOAD_HOST_H_INCLUDED
#define OFFLOAD_HOST_H_INCLUDED

#ifndef TARGET_WINNT
#include <unistd.h>
#endif // TARGET_WINNT
#include "offload_common.h"
#include "offload_util.h"
#include "offload_engine.h"
#include "offload_env.h"
#include "offload_orsl.h"
#include "coi/coi_client.h"

// MIC engines.
DLL_LOCAL extern Engine*  mic_engines;
DLL_LOCAL extern uint32_t mic_engines_total;

// DMA channel count used by COI and set via
// OFFLOAD_DMA_CHANNEL_COUNT environment variable
DLL_LOCAL extern uint32_t mic_dma_channel_count;

//! The target image is packed as follows.
/*!      1. 8 bytes containing the size of the target binary          */
/*!      2. a null-terminated string which is the binary name         */
/*!      3. <size> number of bytes that are the contents of the image */
/*!      The address of symbol __offload_target_image
             is the address of this structure.                        */
struct Image {
     int64_t size; //!< Size in bytes of the target binary name and contents
     char data[];  //!< The name and contents of the target image
};

// The offload descriptor.
class OffloadDescriptor
{
public:
    enum  OmpAsyncLastEventType {
        c_last_not,     // not last event
        c_last_write,   // the last event that is write
        c_last_read,    // the last event that is read
        c_last_runfunc  // the last event that is runfunction
    };
    
    OffloadDescriptor(
        int index,
        _Offload_status *status,
        bool is_mandatory,
        bool is_openmp,
        OffloadHostTimerData * timer_data
    ) :
        m_device(mic_engines[index == -1 ? 0 : index % mic_engines_total]),
        m_is_mandatory(is_mandatory),
        m_is_openmp(is_openmp),
        m_inout_buf(0),
        m_func_desc(0),
        m_func_desc_size(0),
        m_num_in_dependencies(0),
        m_p_in_dependencies(0),
        m_in_deps(0),
        m_in_deps_total(0),
        m_in_deps_allocated(0),        
        m_out_deps(0),
        m_out_deps_total(0),
        m_out_deps_allocated(0),
        m_vars(0),
        m_vars_extra(0),
        m_status(status),
        m_timer_data(timer_data),
        m_out_with_preallocated(false),
        m_preallocated_alloc(false),
        m_traceback_called(false),
        m_stream(-1),
        m_signal(0),
        m_has_signal(0),
        m_omp_async_last_event_type(c_last_not)
    {
        m_wait_all_devices = index == -1;
    }

    ~OffloadDescriptor()
    {
        if (m_in_deps != 0) {
            free(m_in_deps);
        }
        if (m_out_deps != 0) {
            free(m_out_deps);
        }
        if (m_func_desc != 0) {
            free(m_func_desc);
        }
        if (m_vars != 0) {
            free(m_vars);
            free(m_vars_extra);
        }
    }

    bool 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,
                 OffloadFlags offload_flags);

    bool offload_finish(bool is_traceback);

    bool is_signaled();

    OffloadHostTimerData* get_timer_data() const {
        return m_timer_data;
    }

    void set_stream(_Offload_stream stream) {
        m_stream = stream;
    }

    _Offload_stream get_stream() {
        return(m_stream);
    }

    Engine& get_device() {
        return m_device;
    }

    void* get_signal() {
        return(m_signal);
    }

    void set_signal(const void* signal) {
        m_has_signal = 1;
        m_signal = const_cast<void*>(signal);
    }

    void cleanup();

    uint32_t  m_event_count;
    bool      m_has_signal;

private:
    bool offload_wrap(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,
                 OffloadFlags offload_flags);
    bool wait_dependencies(const void **waits, int num_waits,
                           _Offload_stream stream);
    bool setup_descriptors(VarDesc *vars, VarDesc2 *vars2, int vars_total,
                           int entry_id, const void *stack_addr);
    bool setup_misc_data(const char *name);
    bool send_pointer_data(bool is_async, void* info);
    bool send_noncontiguous_pointer_data(
        int i,
        PtrData* src_buf,
        PtrData* dst_buf,
        COIEVENT *event,
        uint64_t  &sent_data,
        uint32_t in_deps_amount,
        COIEVENT *in_deps
        );
    bool receive_noncontiguous_pointer_data(
        int i,
        COIBUFFER dst_buf,
        COIEVENT *event,
        uint64_t  &received_data,
        uint32_t in_deps_amount,
        COIEVENT *in_deps
        );

    bool gather_copyin_data();

    bool compute(void *);

    bool receive_pointer_data(bool is_async, bool first_run, void * info);
    bool scatter_copyout_data();

    bool find_ptr_data(PtrData* &ptr_data, void *base, int64_t disp,
                       int64_t length, bool is_targptr,
                       bool error_does_not_exist = true);

    void find_device_ptr( int64_t* &device_ptr,
                       void *host_ptr);

    bool alloc_ptr_data(PtrData* &ptr_data, void *base, int64_t disp,
                        int64_t length, int64_t alloc_disp, int align,
                        bool is_targptr, bool is_prealloc, bool pin);
    bool create_preallocated_buffer(PtrData* ptr_data, void *base);
    bool init_static_ptr_data(PtrData *ptr_data);
    bool init_mic_address(PtrData *ptr_data);
    bool offload_stack_memory_manager(
        const void * stack_begin,
        int routine_id,
        int buf_size,
        int align,
        bool thread_specific_function_locals,
        bool *is_new);
    char *get_this_threads_cpu_stack_addr(
        const void * stack_begin,
        int routine_id,
        bool thread_specific_function_locals);
    PtrData *get_this_threads_mic_stack_addr(
        const void * stack_begin,
        int routine_id,
        bool thread_specific_function_locals);
    bool nullify_target_stack(COIBUFFER targ_buf, uint64_t size);

    bool gen_var_descs_for_pointer_array(int i);

    void get_stream_in_dependencies(uint32_t &in_deps_amount,
                                    COIEVENT* &in_deps);

    void report_coi_error(error_types msg, COIRESULT res);
    _Offload_result translate_coi_error(COIRESULT res) const;

    void setup_omp_async_info();

    void setup_use_device_ptr(int i);

    void register_event_call_back(void (*)(
                                      COIEVENT,
                                      const COIRESULT,
                                      const void*),
                                  const COIEVENT *event,
                                  const void *info);

    void register_omp_event_call_back(const COIEVENT *event, const void *info);

private:
    typedef std::list<COIBUFFER> BufferList;

    // extra data associated with each variable descriptor
    struct VarExtra {
        PtrData* src_data;
        PtrData* dst_data;
        AutoData* auto_data;
        int64_t cpu_disp;
        int64_t cpu_offset;
        void *alloc;
        union {
            CeanReadRanges *read_rng_src;
            NonContigDesc  *noncont_desc;
        };
        CeanReadRanges *read_rng_dst;
        int64_t ptr_arr_offset;
        bool is_arr_ptr_el;
        OmpAsyncLastEventType omp_last_event_type;
        int64_t pointer_offset;
        uint16_t type_src;
        uint16_t type_dst;
    };

    template<typename T> class ReadArrElements {
    public:
        ReadArrElements():
            ranges(NULL),
            el_size(sizeof(T)),
            offset(0),
            count(0),
            is_empty(true),
            base(NULL)
        {}

        bool read_next(bool flag)
        {
            if (flag != 0) {
                if (is_empty) {
                    if (ranges) {
                        if (!get_next_range(ranges, &offset)) {
                            // ranges are over
                            return false;
                        }
                    }
                    // all contiguous elements are over
                    else if (count != 0) {
                        return false;
                    }

                    length_cur = size;
                }
                else {
                    offset += el_size;
                }
                val = (T)get_el_value(base, offset, el_size);
                length_cur -= el_size;
                count++;
                is_empty = length_cur == 0;
            }
            return true;
        }
    public:
        CeanReadRanges * ranges;
        T       val;
        int     el_size;
        int64_t size,
                offset,
                length_cur;
        bool    is_empty;
        int     count;
        char   *base;
    };

    // ptr_data for persistent auto objects
    PtrData*    m_stack_ptr_data;
    PtrDataList m_destroy_stack;

    // Engine
    Engine& m_device;

    // true for offload_wait target(mic) stream(0)
    bool m_wait_all_devices;

    // if true offload is mandatory
    bool m_is_mandatory;

    // if true offload has openmp origin
    const bool m_is_openmp;

    // The Marshaller for the inputs of the offloaded region.
    Marshaller m_in;

    // The Marshaller for the outputs of the offloaded region.
    Marshaller m_out;

    // List of buffers that are passed to dispatch call
    BufferList m_compute_buffers;

    // List of buffers that need to be destroyed at the end of offload
    BufferList m_destroy_buffers;

    // Variable descriptors
    VarDesc*  m_vars;
    VarExtra* m_vars_extra;
    int       m_vars_total;

    // Pointer to a user-specified status variable
    _Offload_status *m_status;

    // Function descriptor
    FunctionDescriptor* m_func_desc;
    uint32_t            m_func_desc_size;

    // Buffer for transferring copyin/copyout data
    COIBUFFER m_inout_buf;


    // Dependencies
    COIEVENT *m_in_deps;
    uint32_t  m_in_deps_total;
    uint32_t  m_in_deps_allocated;    
    COIEVENT *m_out_deps;
    uint32_t  m_out_deps_total;
    uint32_t  m_out_deps_allocated;

    // 2 variables defines input dependencies for current COI API.
    // The calls to routines as BufferWrite/PipelineRunFunction/BufferRead
    // is supposed to have input dependencies.
    // 2 variables below defines the number and vector of dependencies
    // in every current moment of offload.
    // So any phase of offload can use its values as input dependencies 
    // for the COI API that the phase calls.
    // It means that all phases (of Write, RunFunction,Read) must keep
    // the variables correct to be used by following phase.
    // If some consequent offloads are connected (i.e. by the same stream)
    // the final 2 variables of the offload is used as initial inputs
    // for the next offload.
    uint32_t  m_num_in_dependencies;
    COIEVENT *m_p_in_dependencies;

    // Stream
    _Offload_stream m_stream;

    // Signal
    void* m_signal;

    // Timer data
    OffloadHostTimerData *m_timer_data;

    // copyin/copyout data length
    uint64_t m_in_datalen;
    uint64_t m_out_datalen;

    // a boolean value calculated in setup_descriptors. If true we need to do
    // a run function on the target. Otherwise it may be optimized away.
    bool m_need_runfunction;

    // initialized value of m_need_runfunction;
    // is used to recognize offload_transfer
    bool m_initial_need_runfunction;

    // a Boolean value set to true when OUT clauses with preallocated targetptr
    // is encountered to indicate that call receive_pointer_data needs to be
    // invoked again after call to scatter_copyout_data.
    bool m_out_with_preallocated;

    // a Boolean value set to true if an alloc_if(1) is used with preallocated
    // targetptr to indicate the need to scatter_copyout_data even for
    // async offload
    bool m_preallocated_alloc;

    // a Boolean value set to true if traceback routine is called
    bool m_traceback_called;  

    OmpAsyncLastEventType m_omp_async_last_event_type;
};

// Initialization types for MIC
enum OffloadInitType {
    c_init_on_start,         // all devices before entering main
    c_init_on_offload,       // single device before starting the first offload
    c_init_on_offload_all    // all devices before starting the first offload
};

// Determines if MIC code is an executable or a shared library
extern "C" bool __offload_target_image_is_executable(const void *target_image);

// Initializes library and registers specified offload image.
extern "C" bool __offload_register_image(const void* image);
extern "C" void __offload_unregister_image(const void* image);

// Registers asynchronous task completion callback
extern "C" void __offload_register_task_callback(void (*cb)(void *));

// Initializes offload runtime library.
DLL_LOCAL extern int __offload_init_library(void);

// thread data for associating pipelines with threads
DLL_LOCAL extern pthread_key_t mic_thread_key;

// location of offload_main executable
// To be used if the main application has no offload and is not built
// with -offload but dynamic library linked in has offload pragma
DLL_LOCAL extern char* mic_device_main;

// Environment variables for devices
DLL_LOCAL extern MicEnvVar mic_env_vars;

// CPU frequency
DLL_LOCAL extern uint64_t cpu_frequency;

// LD_LIBRARY_PATH for KNC libraries
DLL_LOCAL extern char* knc_library_path;

// LD_LIBRARY_PATH for KNL libraries
DLL_LOCAL extern char* knl_library_path;

// stack size for target
DLL_LOCAL extern uint32_t mic_stack_size;

// Preallocated memory size for buffers on MIC
DLL_LOCAL extern uint64_t mic_buffer_size;

// Preallocated 4K page memory size for buffers on MIC
DLL_LOCAL extern uint64_t mic_4k_buffer_size;

// Preallocated 2M page memory size for buffers on MIC
DLL_LOCAL extern uint64_t mic_2m_buffer_size;

// Setting controlling inout proxy
DLL_LOCAL extern bool  mic_proxy_io;
DLL_LOCAL extern char* mic_proxy_fs_root;

// Threshold for creating buffers with large pages
DLL_LOCAL extern uint64_t __offload_use_2mb_buffers;

// offload initialization type
DLL_LOCAL extern OffloadInitType __offload_init_type;

// Device number to offload to when device is not explicitly specified.
DLL_LOCAL extern int __omp_device_num;

// target executable
DLL_LOCAL extern TargetImage* __target_exe;

// is true if last loaded image is dll
DLL_LOCAL extern bool __current_image_is_dll;
// is true if myo library is loaded when dll is loaded
DLL_LOCAL extern bool __myo_init_in_so;

// IDB support

// Called by the offload runtime after initialization of offload infrastructure
// has been completed.
extern "C" void  __dbg_target_so_loaded();

// Called by the offload runtime when the offload infrastructure is about to be
// shut down, currently at application exit.
extern "C" void  __dbg_target_so_unloaded();

// Null-terminated string containing path to the process image of the hosting
// application (offload_main)
#define MAX_TARGET_NAME 512
extern "C" char  __dbg_target_exe_name[MAX_TARGET_NAME];

// Integer specifying the process id
extern "C" pid_t __dbg_target_so_pid;

// Integer specifying the 0-based device number
extern "C" int   __dbg_target_id;

// Set to non-zero by the host-side debugger to enable offload debugging
// support
extern "C" int   __dbg_is_attached;

// Major version of the debugger support API
extern "C" const int __dbg_api_major_version;

// Minor version of the debugger support API
extern "C" const int __dbg_api_minor_version;

#endif // OFFLOAD_HOST_H_INCLUDED