forked from OSchip/llvm-project
85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
//===-- runtime/misc-intrinsic.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/misc-intrinsic.h"
|
|
#include "terminator.h"
|
|
#include "flang/Runtime/descriptor.h"
|
|
#include <algorithm>
|
|
#include <cstring>
|
|
#include <optional>
|
|
|
|
namespace Fortran::runtime {
|
|
|
|
static void TransferImpl(Descriptor &result, const Descriptor &source,
|
|
const Descriptor &mold, const char *sourceFile, int line,
|
|
std::optional<std::int64_t> resultExtent) {
|
|
int rank{resultExtent.has_value() ? 1 : 0};
|
|
std::size_t elementBytes{mold.ElementBytes()};
|
|
result.Establish(mold.type(), elementBytes, nullptr, rank, nullptr,
|
|
CFI_attribute_allocatable, mold.Addendum() != nullptr);
|
|
if (resultExtent) {
|
|
result.GetDimension(0).SetBounds(1, *resultExtent);
|
|
}
|
|
if (const DescriptorAddendum * addendum{mold.Addendum()}) {
|
|
*result.Addendum() = *addendum;
|
|
}
|
|
if (int stat{result.Allocate()}) {
|
|
Terminator{sourceFile, line}.Crash(
|
|
"TRANSFER: could not allocate memory for result; STAT=%d", stat);
|
|
}
|
|
char *to{result.OffsetElement<char>()};
|
|
std::size_t resultBytes{result.Elements() * result.ElementBytes()};
|
|
const std::size_t sourceElementBytes{source.ElementBytes()};
|
|
std::size_t sourceElements{source.Elements()};
|
|
SubscriptValue sourceAt[maxRank];
|
|
source.GetLowerBounds(sourceAt);
|
|
while (resultBytes > 0 && sourceElements > 0) {
|
|
std::size_t toMove{std::min(resultBytes, sourceElementBytes)};
|
|
std::memcpy(to, source.Element<char>(sourceAt), toMove);
|
|
to += toMove;
|
|
resultBytes -= toMove;
|
|
--sourceElements;
|
|
source.IncrementSubscripts(sourceAt);
|
|
}
|
|
if (resultBytes > 0) {
|
|
std::memset(to, 0, resultBytes);
|
|
}
|
|
}
|
|
|
|
extern "C" {
|
|
|
|
void RTNAME(Transfer)(Descriptor &result, const Descriptor &source,
|
|
const Descriptor &mold, const char *sourceFile, int line) {
|
|
std::optional<std::int64_t> elements;
|
|
if (mold.rank() > 0) {
|
|
if (std::size_t sourceElementBytes{
|
|
source.Elements() * source.ElementBytes()}) {
|
|
if (std::size_t moldElementBytes{mold.ElementBytes()}) {
|
|
elements = static_cast<std::int64_t>(
|
|
(sourceElementBytes + moldElementBytes - 1) / moldElementBytes);
|
|
} else {
|
|
Terminator{sourceFile, line}.Crash("TRANSFER: zero-sized type of MOLD= "
|
|
"when SOURCE= is not zero-sized");
|
|
}
|
|
} else {
|
|
elements = 0;
|
|
}
|
|
}
|
|
return TransferImpl(
|
|
result, source, mold, sourceFile, line, std::move(elements));
|
|
}
|
|
|
|
void RTNAME(TransferSize)(Descriptor &result, const Descriptor &source,
|
|
const Descriptor &mold, const char *sourceFile, int line,
|
|
std::int64_t size) {
|
|
return TransferImpl(result, source, mold, sourceFile, line, size);
|
|
}
|
|
|
|
} // extern "C"
|
|
} // namespace Fortran::runtime
|