//===-------- interface.cpp - Target independent OpenMP target RTL --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Implementation of the interface to be used by Clang during the codegen of a
// target region.
//
//===----------------------------------------------------------------------===//

#include "device.h"
#include "omptarget.h"
#include "private.h"
#include "rtl.h"

#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <mutex>

////////////////////////////////////////////////////////////////////////////////
/// adds requires flags
EXTERN void __tgt_register_requires(int64_t flags) {
  TIMESCOPE();
  PM->RTLs.RegisterRequires(flags);
}

////////////////////////////////////////////////////////////////////////////////
/// adds a target shared library to the target execution image
EXTERN void __tgt_register_lib(__tgt_bin_desc *desc) {
  TIMESCOPE();
  std::call_once(PM->RTLs.initFlag, &RTLsTy::LoadRTLs, &PM->RTLs);
  for (auto &RTL : PM->RTLs.AllRTLs) {
    if (RTL.register_lib) {
      if ((*RTL.register_lib)(desc) != OFFLOAD_SUCCESS) {
        DP("Could not register library with %s", RTL.RTLName.c_str());
      }
    }
  }
  PM->RTLs.RegisterLib(desc);
}

////////////////////////////////////////////////////////////////////////////////
/// unloads a target shared library
EXTERN void __tgt_unregister_lib(__tgt_bin_desc *desc) {
  TIMESCOPE();
  PM->RTLs.UnregisterLib(desc);
  for (auto &RTL : PM->RTLs.UsedRTLs) {
    if (RTL->unregister_lib) {
      if ((*RTL->unregister_lib)(desc) != OFFLOAD_SUCCESS) {
        DP("Could not register library with %s", RTL->RTLName.c_str());
      }
    }
  }
}

/// creates host-to-target data mapping, stores it in the
/// libomptarget.so internal structure (an entry in a stack of data maps)
/// and passes the data to the device.
EXTERN void __tgt_target_data_begin(int64_t device_id, int32_t arg_num,
                                    void **args_base, void **args,
                                    int64_t *arg_sizes, int64_t *arg_types) {
  TIMESCOPE();
  __tgt_target_data_begin_mapper(nullptr, device_id, arg_num, args_base, args,
                                 arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_begin_nowait(int64_t device_id, int32_t arg_num,
                                           void **args_base, void **args,
                                           int64_t *arg_sizes,
                                           int64_t *arg_types, int32_t depNum,
                                           void *depList, int32_t noAliasDepNum,
                                           void *noAliasDepList) {
  TIMESCOPE();
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(NULL, __kmpc_global_thread_num(NULL));

  __tgt_target_data_begin_mapper(nullptr, device_id, arg_num, args_base, args,
                                 arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_begin_mapper(ident_t *loc, int64_t device_id,
                                           int32_t arg_num, void **args_base,
                                           void **args, int64_t *arg_sizes,
                                           int64_t *arg_types,
                                           map_var_info_t *arg_names,
                                           void **arg_mappers) {
  TIMESCOPE_WITH_IDENT(loc);
  DP("Entering data begin region for device %" PRId64 " with %d mappings\n",
     device_id, arg_num);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return;
  }

  DeviceTy &Device = PM->Devices[device_id];

  if (getInfoLevel() & OMP_INFOTYPE_KERNEL_ARGS)
    printKernelArguments(loc, device_id, arg_num, arg_sizes, arg_types,
                         arg_names, "Entering OpenMP data region");
#ifdef OMPTARGET_DEBUG
  for (int i = 0; i < arg_num; ++i) {
    DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
       ", Type=0x%" PRIx64 ", Name=%s\n",
       i, DPxPTR(args_base[i]), DPxPTR(args[i]), arg_sizes[i], arg_types[i],
       (arg_names) ? getNameFromMapping(arg_names[i]).c_str() : "unknown");
  }
#endif

  AsyncInfoTy AsyncInfo(Device);
  int rc = targetDataBegin(loc, Device, arg_num, args_base, args, arg_sizes,
                           arg_types, arg_names, arg_mappers, AsyncInfo);
  if (rc == OFFLOAD_SUCCESS)
    rc = AsyncInfo.synchronize();
  handleTargetOutcome(rc == OFFLOAD_SUCCESS, loc);
}

EXTERN void __tgt_target_data_begin_nowait_mapper(
    ident_t *loc, int64_t device_id, int32_t arg_num, void **args_base,
    void **args, int64_t *arg_sizes, int64_t *arg_types,
    map_var_info_t *arg_names, void **arg_mappers, int32_t depNum,
    void *depList, int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE_WITH_IDENT(loc);
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(loc, __kmpc_global_thread_num(loc));

  __tgt_target_data_begin_mapper(loc, device_id, arg_num, args_base, args,
                                 arg_sizes, arg_types, arg_names, arg_mappers);
}

/// passes data from the target, releases target memory and destroys
/// the host-target mapping (top entry from the stack of data maps)
/// created by the last __tgt_target_data_begin.
EXTERN void __tgt_target_data_end(int64_t device_id, int32_t arg_num,
                                  void **args_base, void **args,
                                  int64_t *arg_sizes, int64_t *arg_types) {
  TIMESCOPE();
  __tgt_target_data_end_mapper(nullptr, device_id, arg_num, args_base, args,
                               arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_end_nowait(int64_t device_id, int32_t arg_num,
                                         void **args_base, void **args,
                                         int64_t *arg_sizes, int64_t *arg_types,
                                         int32_t depNum, void *depList,
                                         int32_t noAliasDepNum,
                                         void *noAliasDepList) {
  TIMESCOPE();
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(NULL, __kmpc_global_thread_num(NULL));

  __tgt_target_data_end_mapper(nullptr, device_id, arg_num, args_base, args,
                               arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_end_mapper(ident_t *loc, int64_t device_id,
                                         int32_t arg_num, void **args_base,
                                         void **args, int64_t *arg_sizes,
                                         int64_t *arg_types,
                                         map_var_info_t *arg_names,
                                         void **arg_mappers) {
  TIMESCOPE_WITH_IDENT(loc);
  DP("Entering data end region with %d mappings\n", arg_num);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return;
  }

  DeviceTy &Device = PM->Devices[device_id];

  if (getInfoLevel() & OMP_INFOTYPE_KERNEL_ARGS)
    printKernelArguments(loc, device_id, arg_num, arg_sizes, arg_types,
                         arg_names, "Exiting OpenMP data region");
#ifdef OMPTARGET_DEBUG
  for (int i = 0; i < arg_num; ++i) {
    DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
       ", Type=0x%" PRIx64 ", Name=%s\n",
       i, DPxPTR(args_base[i]), DPxPTR(args[i]), arg_sizes[i], arg_types[i],
       (arg_names) ? getNameFromMapping(arg_names[i]).c_str() : "unknown");
  }
#endif

  AsyncInfoTy AsyncInfo(Device);
  int rc = targetDataEnd(loc, Device, arg_num, args_base, args, arg_sizes,
                         arg_types, arg_names, arg_mappers, AsyncInfo);
  if (rc == OFFLOAD_SUCCESS)
    rc = AsyncInfo.synchronize();
  handleTargetOutcome(rc == OFFLOAD_SUCCESS, loc);
}

EXTERN void __tgt_target_data_end_nowait_mapper(
    ident_t *loc, int64_t device_id, int32_t arg_num, void **args_base,
    void **args, int64_t *arg_sizes, int64_t *arg_types,
    map_var_info_t *arg_names, void **arg_mappers, int32_t depNum,
    void *depList, int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE_WITH_IDENT(loc);
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(loc, __kmpc_global_thread_num(loc));

  __tgt_target_data_end_mapper(loc, device_id, arg_num, args_base, args,
                               arg_sizes, arg_types, arg_names, arg_mappers);
}

EXTERN void __tgt_target_data_update(int64_t device_id, int32_t arg_num,
                                     void **args_base, void **args,
                                     int64_t *arg_sizes, int64_t *arg_types) {
  TIMESCOPE();
  __tgt_target_data_update_mapper(nullptr, device_id, arg_num, args_base, args,
                                  arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_update_nowait(
    int64_t device_id, int32_t arg_num, void **args_base, void **args,
    int64_t *arg_sizes, int64_t *arg_types, int32_t depNum, void *depList,
    int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE();
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(NULL, __kmpc_global_thread_num(NULL));

  __tgt_target_data_update_mapper(nullptr, device_id, arg_num, args_base, args,
                                  arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN void __tgt_target_data_update_mapper(ident_t *loc, int64_t device_id,
                                            int32_t arg_num, void **args_base,
                                            void **args, int64_t *arg_sizes,
                                            int64_t *arg_types,
                                            map_var_info_t *arg_names,
                                            void **arg_mappers) {
  TIMESCOPE_WITH_IDENT(loc);
  DP("Entering data update with %d mappings\n", arg_num);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return;
  }

  if (getInfoLevel() & OMP_INFOTYPE_KERNEL_ARGS)
    printKernelArguments(loc, device_id, arg_num, arg_sizes, arg_types,
                         arg_names, "Updating OpenMP data");

  DeviceTy &Device = PM->Devices[device_id];
  AsyncInfoTy AsyncInfo(Device);
  int rc = targetDataUpdate(loc, Device, arg_num, args_base, args, arg_sizes,
                            arg_types, arg_names, arg_mappers, AsyncInfo);
  if (rc == OFFLOAD_SUCCESS)
    rc = AsyncInfo.synchronize();
  handleTargetOutcome(rc == OFFLOAD_SUCCESS, loc);
}

EXTERN void __tgt_target_data_update_nowait_mapper(
    ident_t *loc, int64_t device_id, int32_t arg_num, void **args_base,
    void **args, int64_t *arg_sizes, int64_t *arg_types,
    map_var_info_t *arg_names, void **arg_mappers, int32_t depNum,
    void *depList, int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE_WITH_IDENT(loc);
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(loc, __kmpc_global_thread_num(loc));

  __tgt_target_data_update_mapper(loc, device_id, arg_num, args_base, args,
                                  arg_sizes, arg_types, arg_names, arg_mappers);
}

EXTERN int __tgt_target(int64_t device_id, void *host_ptr, int32_t arg_num,
                        void **args_base, void **args, int64_t *arg_sizes,
                        int64_t *arg_types) {
  TIMESCOPE();
  return __tgt_target_mapper(nullptr, device_id, host_ptr, arg_num, args_base,
                             args, arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN int __tgt_target_nowait(int64_t device_id, void *host_ptr,
                               int32_t arg_num, void **args_base, void **args,
                               int64_t *arg_sizes, int64_t *arg_types,
                               int32_t depNum, void *depList,
                               int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE();
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(NULL, __kmpc_global_thread_num(NULL));

  return __tgt_target_mapper(nullptr, device_id, host_ptr, arg_num, args_base,
                             args, arg_sizes, arg_types, nullptr, nullptr);
}

EXTERN int __tgt_target_mapper(ident_t *loc, int64_t device_id, void *host_ptr,
                               int32_t arg_num, void **args_base, void **args,
                               int64_t *arg_sizes, int64_t *arg_types,
                               map_var_info_t *arg_names, void **arg_mappers) {
  TIMESCOPE_WITH_IDENT(loc);
  DP("Entering target region with entry point " DPxMOD " and device Id %" PRId64
     "\n",
     DPxPTR(host_ptr), device_id);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return OFFLOAD_FAIL;
  }

  if (getInfoLevel() & OMP_INFOTYPE_KERNEL_ARGS)
    printKernelArguments(loc, device_id, arg_num, arg_sizes, arg_types,
                         arg_names, "Entering OpenMP kernel");
#ifdef OMPTARGET_DEBUG
  for (int i = 0; i < arg_num; ++i) {
    DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
       ", Type=0x%" PRIx64 ", Name=%s\n",
       i, DPxPTR(args_base[i]), DPxPTR(args[i]), arg_sizes[i], arg_types[i],
       (arg_names) ? getNameFromMapping(arg_names[i]).c_str() : "unknown");
  }
#endif

  DeviceTy &Device = PM->Devices[device_id];
  AsyncInfoTy AsyncInfo(Device);
  int rc = target(loc, Device, host_ptr, arg_num, args_base, args, arg_sizes,
                  arg_types, arg_names, arg_mappers, 0, 0, false /*team*/,
                  AsyncInfo);
  if (rc == OFFLOAD_SUCCESS)
    rc = AsyncInfo.synchronize();
  handleTargetOutcome(rc == OFFLOAD_SUCCESS, loc);
  return rc;
}

EXTERN int __tgt_target_nowait_mapper(
    ident_t *loc, int64_t device_id, void *host_ptr, int32_t arg_num,
    void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types,
    map_var_info_t *arg_names, void **arg_mappers, int32_t depNum,
    void *depList, int32_t noAliasDepNum, void *noAliasDepList) {
  TIMESCOPE_WITH_IDENT(loc);
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(loc, __kmpc_global_thread_num(loc));

  return __tgt_target_mapper(loc, device_id, host_ptr, arg_num, args_base, args,
                             arg_sizes, arg_types, arg_names, arg_mappers);
}

EXTERN int __tgt_target_teams(int64_t device_id, void *host_ptr,
                              int32_t arg_num, void **args_base, void **args,
                              int64_t *arg_sizes, int64_t *arg_types,
                              int32_t team_num, int32_t thread_limit) {
  TIMESCOPE();
  return __tgt_target_teams_mapper(nullptr, device_id, host_ptr, arg_num,
                                   args_base, args, arg_sizes, arg_types,
                                   nullptr, nullptr, team_num, thread_limit);
}

EXTERN int __tgt_target_teams_nowait(int64_t device_id, void *host_ptr,
                                     int32_t arg_num, void **args_base,
                                     void **args, int64_t *arg_sizes,
                                     int64_t *arg_types, int32_t team_num,
                                     int32_t thread_limit, int32_t depNum,
                                     void *depList, int32_t noAliasDepNum,
                                     void *noAliasDepList) {
  TIMESCOPE();
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(NULL, __kmpc_global_thread_num(NULL));

  return __tgt_target_teams_mapper(nullptr, device_id, host_ptr, arg_num,
                                   args_base, args, arg_sizes, arg_types,
                                   nullptr, nullptr, team_num, thread_limit);
}

EXTERN int __tgt_target_teams_mapper(ident_t *loc, int64_t device_id,
                                     void *host_ptr, int32_t arg_num,
                                     void **args_base, void **args,
                                     int64_t *arg_sizes, int64_t *arg_types,
                                     map_var_info_t *arg_names,
                                     void **arg_mappers, int32_t team_num,
                                     int32_t thread_limit) {
  DP("Entering target region with entry point " DPxMOD " and device Id %" PRId64
     "\n",
     DPxPTR(host_ptr), device_id);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return OFFLOAD_FAIL;
  }

  if (getInfoLevel() & OMP_INFOTYPE_KERNEL_ARGS)
    printKernelArguments(loc, device_id, arg_num, arg_sizes, arg_types,
                         arg_names, "Entering OpenMP kernel");
#ifdef OMPTARGET_DEBUG
  for (int i = 0; i < arg_num; ++i) {
    DP("Entry %2d: Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
       ", Type=0x%" PRIx64 ", Name=%s\n",
       i, DPxPTR(args_base[i]), DPxPTR(args[i]), arg_sizes[i], arg_types[i],
       (arg_names) ? getNameFromMapping(arg_names[i]).c_str() : "unknown");
  }
#endif

  DeviceTy &Device = PM->Devices[device_id];
  AsyncInfoTy AsyncInfo(Device);
  int rc = target(loc, Device, host_ptr, arg_num, args_base, args, arg_sizes,
                  arg_types, arg_names, arg_mappers, team_num, thread_limit,
                  true /*team*/, AsyncInfo);
  if (rc == OFFLOAD_SUCCESS)
    rc = AsyncInfo.synchronize();
  handleTargetOutcome(rc == OFFLOAD_SUCCESS, loc);
  return rc;
}

EXTERN int __tgt_target_teams_nowait_mapper(
    ident_t *loc, int64_t device_id, void *host_ptr, int32_t arg_num,
    void **args_base, void **args, int64_t *arg_sizes, int64_t *arg_types,
    map_var_info_t *arg_names, void **arg_mappers, int32_t team_num,
    int32_t thread_limit, int32_t depNum, void *depList, int32_t noAliasDepNum,
    void *noAliasDepList) {
  TIMESCOPE_WITH_IDENT(loc);
  if (depNum + noAliasDepNum > 0)
    __kmpc_omp_taskwait(loc, __kmpc_global_thread_num(loc));

  return __tgt_target_teams_mapper(loc, device_id, host_ptr, arg_num, args_base,
                                   args, arg_sizes, arg_types, arg_names,
                                   arg_mappers, team_num, thread_limit);
}

// Get the current number of components for a user-defined mapper.
EXTERN int64_t __tgt_mapper_num_components(void *rt_mapper_handle) {
  TIMESCOPE();
  auto *MapperComponentsPtr = (struct MapperComponentsTy *)rt_mapper_handle;
  int64_t size = MapperComponentsPtr->Components.size();
  DP("__tgt_mapper_num_components(Handle=" DPxMOD ") returns %" PRId64 "\n",
     DPxPTR(rt_mapper_handle), size);
  return size;
}

// Push back one component for a user-defined mapper.
EXTERN void __tgt_push_mapper_component(void *rt_mapper_handle, void *base,
                                        void *begin, int64_t size, int64_t type,
                                        void *name) {
  TIMESCOPE();
  DP("__tgt_push_mapper_component(Handle=" DPxMOD
     ") adds an entry (Base=" DPxMOD ", Begin=" DPxMOD ", Size=%" PRId64
     ", Type=0x%" PRIx64 ", Name=%s).\n",
     DPxPTR(rt_mapper_handle), DPxPTR(base), DPxPTR(begin), size, type,
     (name) ? getNameFromMapping(name).c_str() : "unknown");
  auto *MapperComponentsPtr = (struct MapperComponentsTy *)rt_mapper_handle;
  MapperComponentsPtr->Components.push_back(
      MapComponentInfoTy(base, begin, size, type, name));
}

EXTERN void __kmpc_push_target_tripcount(int64_t device_id,
                                         uint64_t loop_tripcount) {
  __kmpc_push_target_tripcount_mapper(nullptr, device_id, loop_tripcount);
}

EXTERN void __kmpc_push_target_tripcount_mapper(ident_t *loc, int64_t device_id,
                                                uint64_t loop_tripcount) {
  TIMESCOPE_WITH_IDENT(loc);
  if (checkDeviceAndCtors(device_id, loc) != OFFLOAD_SUCCESS) {
    DP("Not offloading to device %" PRId64 "\n", device_id);
    return;
  }

  DP("__kmpc_push_target_tripcount(%" PRId64 ", %" PRIu64 ")\n", device_id,
     loop_tripcount);
  PM->TblMapMtx.lock();
  PM->Devices[device_id].LoopTripCnt.emplace(__kmpc_global_thread_num(NULL),
                                             loop_tripcount);
  PM->TblMapMtx.unlock();
}

EXTERN void __tgt_set_info_flag(uint32_t NewInfoLevel) {
  std::atomic<uint32_t> &InfoLevel = getInfoLevelInternal();
  InfoLevel.store(NewInfoLevel);
  for (auto &R : PM->RTLs.AllRTLs) {
    if (R.set_info_flag)
      R.set_info_flag(NewInfoLevel);
  }
}