forked from OSchip/llvm-project
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
//===-- runtime/misc-intrinsic.cpp ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "flang/Runtime/misc-intrinsic.h"
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#include "terminator.h"
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#include "flang/Runtime/descriptor.h"
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#include <algorithm>
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#include <cstring>
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namespace Fortran::runtime {
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extern "C" {
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void RTNAME(Transfer)(Descriptor &result, const Descriptor &source,
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const Descriptor &mold, const char *sourceFile, int line) {
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if (mold.rank() > 0) {
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std::size_t moldElementBytes{mold.ElementBytes()};
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std::size_t elements{
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(source.Elements() * source.ElementBytes() + moldElementBytes - 1) /
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moldElementBytes};
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return RTNAME(TransferSize)(result, source, mold, sourceFile, line,
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static_cast<std::int64_t>(elements));
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} else {
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return RTNAME(TransferSize)(result, source, mold, sourceFile, line, 1);
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}
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}
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void RTNAME(TransferSize)(Descriptor &result, const Descriptor &source,
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const Descriptor &mold, const char *sourceFile, int line,
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std::int64_t size) {
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int rank{mold.rank() > 0 ? 1 : 0};
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std::size_t elementBytes{mold.ElementBytes()};
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result.Establish(mold.type(), elementBytes, nullptr, rank, nullptr,
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CFI_attribute_allocatable, mold.Addendum() != nullptr);
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if (rank > 0) {
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result.GetDimension(0).SetBounds(1, size);
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}
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if (const DescriptorAddendum * addendum{mold.Addendum()}) {
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*result.Addendum() = *addendum;
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}
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if (int stat{result.Allocate()}) {
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Terminator{sourceFile, line}.Crash(
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"TRANSFER: could not allocate memory for result; STAT=%d", stat);
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}
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char *to{result.OffsetElement<char>()};
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std::size_t resultBytes{size * elementBytes};
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const std::size_t sourceElementBytes{source.ElementBytes()};
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std::size_t sourceElements{source.Elements()};
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SubscriptValue sourceAt[maxRank];
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source.GetLowerBounds(sourceAt);
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while (resultBytes > 0 && sourceElements > 0) {
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std::size_t toMove{std::min(resultBytes, sourceElementBytes)};
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std::memcpy(to, source.Element<char>(sourceAt), toMove);
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to += toMove;
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resultBytes -= toMove;
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--sourceElements;
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source.IncrementSubscripts(sourceAt);
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}
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if (resultBytes > 0) {
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std::memset(to, 0, resultBytes);
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}
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}
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} // extern "C"
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} // namespace Fortran::runtime
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