flang/runtime/support.cpp

//===-- runtime/support.cpp -----------------------------------------------===//
//
// 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/support.h"
#include "ISO_Fortran_util.h"
#include "type-info.h"
#include "flang/Runtime/descriptor.h"

namespace Fortran::runtime {
extern "C" {
RT_EXT_API_GROUP_BEGIN

bool RTDEF(IsContiguous)(const Descriptor &descriptor) {
  return descriptor.IsContiguous();
}

bool RTDEF(IsAssumedSize)(const Descriptor &descriptor) {
  return ISO::IsAssumedSize(&descriptor.raw());
}

void RTDEF(CopyAndUpdateDescriptor)(Descriptor &to, const Descriptor &from,
    const typeInfo::DerivedType *newDynamicType,
    ISO::CFI_attribute_t newAttribute, enum LowerBoundModifier newLowerBounds) {
  to = from;
  if (newDynamicType) {
    DescriptorAddendum *toAddendum{to.Addendum()};
    INTERNAL_CHECK(toAddendum);
    toAddendum->set_derivedType(newDynamicType);
    to.raw().elem_len = newDynamicType->sizeInBytes();
  }
  to.raw().attribute = newAttribute;
  if (newLowerBounds != LowerBoundModifier::Preserve) {
    const ISO::CFI_index_t newLowerBound{
        newLowerBounds == LowerBoundModifier::SetToOnes ? 1 : 0};
    const int rank{to.rank()};
    for (int i = 0; i < rank; ++i) {
      to.GetDimension(i).SetLowerBound(newLowerBound);
    }
  }
}

RT_EXT_API_GROUP_END
} // extern "C"
} // namespace Fortran::runtime