//===-- lib/cuda/pointer.cpp ------------------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "flang/Runtime/CUDA/pointer.h"
#include "flang-rt/runtime/assign-impl.h"
#include "flang-rt/runtime/descriptor.h"
#include "flang-rt/runtime/stat.h"
#include "flang-rt/runtime/terminator.h"
#include "flang/Runtime/CUDA/descriptor.h"
#include "flang/Runtime/CUDA/memmove-function.h"
#include "flang/Runtime/pointer.h"

#include "cuda_runtime.h"

namespace Fortran::runtime::cuda {

extern "C" {
RT_EXT_API_GROUP_BEGIN

int RTDEF(CUFPointerAllocate)(Descriptor &desc, int64_t stream, bool *pinned,
    bool hasStat, const Descriptor *errMsg, const char *sourceFile,
    int sourceLine) {
  if (desc.HasAddendum()) {
    Terminator terminator{sourceFile, sourceLine};
    // TODO: This require a bit more work to set the correct type descriptor
    // address
    terminator.Crash(
        "not yet implemented: CUDA descriptor allocation with addendum");
  }
  // Perform the standard allocation.
  int stat{
      RTNAME(PointerAllocate)(desc, hasStat, errMsg, sourceFile, sourceLine)};
  if (pinned) {
    // Set pinned according to stat. More infrastructre is needed to set it
    // closer to the actual allocation call.
    *pinned = (stat == StatOk);
  }
  return stat;
}

int RTDEF(CUFPointerAllocateSync)(Descriptor &desc, int64_t stream,
    bool *pinned, bool hasStat, const Descriptor *errMsg,
    const char *sourceFile, int sourceLine) {
  int stat{RTNAME(CUFPointerAllocate)(
      desc, stream, pinned, hasStat, errMsg, sourceFile, sourceLine)};
#ifndef RT_DEVICE_COMPILATION
  // Descriptor synchronization is only done when the allocation is done
  // from the host.
  if (stat == StatOk) {
    void *deviceAddr{
        RTNAME(CUFGetDeviceAddress)((void *)&desc, sourceFile, sourceLine)};
    RTNAME(CUFDescriptorSync)
    ((Descriptor *)deviceAddr, &desc, sourceFile, sourceLine);
  }
#endif
  return stat;
}

int RTDEF(CUFPointerAllocateSource)(Descriptor &pointer,
    const Descriptor &source, int64_t stream, bool *pinned, bool hasStat,
    const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
  int stat{RTNAME(CUFPointerAllocate)(
      pointer, stream, pinned, hasStat, errMsg, sourceFile, sourceLine)};
  if (stat == StatOk) {
    Terminator terminator{sourceFile, sourceLine};
    Fortran::runtime::DoFromSourceAssign(
        pointer, source, terminator, &MemmoveHostToDevice);
  }
  return stat;
}

int RTDEF(CUFPointerAllocateSourceSync)(Descriptor &pointer,
    const Descriptor &source, int64_t stream, bool *pinned, bool hasStat,
    const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
  int stat{RTNAME(CUFPointerAllocateSync)(
      pointer, stream, pinned, hasStat, errMsg, sourceFile, sourceLine)};
  if (stat == StatOk) {
    Terminator terminator{sourceFile, sourceLine};
    Fortran::runtime::DoFromSourceAssign(
        pointer, source, terminator, &MemmoveHostToDevice);
  }
  return stat;
}

RT_EXT_API_GROUP_END

} // extern "C"

} // namespace Fortran::runtime::cuda