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//===-- runtime/internal-unit.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 "internal-unit.h"
#include "io-error.h"
#include "flang/Runtime/descriptor.h"
#include <algorithm>
#include <type_traits>
namespace Fortran::runtime::io {
template <Direction DIR>
InternalDescriptorUnit<DIR>::InternalDescriptorUnit(
Scalar scalar, std::size_t length, int kind) {
internalIoCharKind = kind;
recordLength = length;
endfileRecordNumber = 2;
void *pointer{reinterpret_cast<void *>(const_cast<char *>(scalar))};
descriptor().Establish(TypeCode{TypeCategory::Character, kind}, length * kind,
pointer, 0, nullptr, CFI_attribute_pointer);
}
template <Direction DIR>
InternalDescriptorUnit<DIR>::InternalDescriptorUnit(
const Descriptor &that, const Terminator &terminator) {
auto thatType{that.type().GetCategoryAndKind()};
RUNTIME_CHECK(terminator, thatType.has_value());
RUNTIME_CHECK(terminator, thatType->first == TypeCategory::Character);
Descriptor &d{descriptor()};
RUNTIME_CHECK(
terminator, that.SizeInBytes() <= d.SizeInBytes(maxRank, true, 0));
new (&d) Descriptor{that};
d.Check();
internalIoCharKind = thatType->second;
recordLength = d.ElementBytes();
endfileRecordNumber = d.Elements() + 1;
}
template <Direction DIR> void InternalDescriptorUnit<DIR>::EndIoStatement() {
if constexpr (DIR == Direction::Output) {
// Clear the remainder of the current record if anything was written
// to it, or if it is the only record.
auto end{endfileRecordNumber.value_or(0)};
if (currentRecordNumber < end &&
(end == 2 || furthestPositionInRecord > 0)) {
BlankFillOutputRecord();
}
}
}
template <Direction DIR>
bool InternalDescriptorUnit<DIR>::Emit(
const char *data, std::size_t bytes, IoErrorHandler &handler) {
if constexpr (DIR == Direction::Input) {
handler.Crash("InternalDescriptorUnit<Direction::Input>::Emit() called");
return false && data[bytes] != 0; // bogus compare silences GCC warning
} else {
if (bytes <= 0) {
return true;
}
char *record{CurrentRecord()};
if (!record) {
handler.SignalError(IostatInternalWriteOverrun);
return false;
}
auto furthestAfter{std::max(furthestPositionInRecord,
positionInRecord + static_cast<std::int64_t>(bytes))};
bool ok{true};
if (furthestAfter > static_cast<std::int64_t>(recordLength.value_or(0))) {
handler.SignalError(IostatRecordWriteOverrun);
furthestAfter = recordLength.value_or(0);
bytes = std::max(std::int64_t{0}, furthestAfter - positionInRecord);
ok = false;
} else if (positionInRecord > furthestPositionInRecord) {
BlankFill(record + furthestPositionInRecord,
positionInRecord - furthestPositionInRecord);
}
std::memcpy(record + positionInRecord, data, bytes);
positionInRecord += bytes;
furthestPositionInRecord = furthestAfter;
return ok;
}
}
template <Direction DIR>
std::size_t InternalDescriptorUnit<DIR>::GetNextInputBytes(
const char *&p, IoErrorHandler &handler) {
if constexpr (DIR == Direction::Output) {
handler.Crash("InternalDescriptorUnit<Direction::Output>::"
"GetNextInputBytes() called");
return 0;
} else {
const char *record{CurrentRecord()};
if (!record) {
handler.SignalEnd();
return 0;
} else if (positionInRecord >= recordLength.value_or(positionInRecord)) {
return 0;
} else {
p = &record[positionInRecord];
return *recordLength - positionInRecord;
}
}
}
template <Direction DIR>
bool InternalDescriptorUnit<DIR>::AdvanceRecord(IoErrorHandler &handler) {
if (currentRecordNumber >= endfileRecordNumber.value_or(0)) {
handler.SignalEnd();
return false;
}
if constexpr (DIR == Direction::Output) {
BlankFillOutputRecord();
}
++currentRecordNumber;
BeginRecord();
return true;
}
template <Direction DIR>
void InternalDescriptorUnit<DIR>::BlankFill(char *at, std::size_t bytes) {
switch (internalIoCharKind) {
case 2:
std::fill_n(reinterpret_cast<char16_t *>(at), bytes / 2,
static_cast<char16_t>(' '));
break;
case 4:
std::fill_n(reinterpret_cast<char32_t *>(at), bytes / 4,
static_cast<char32_t>(' '));
break;
default:
std::fill_n(at, bytes, ' ');
break;
}
}
template <Direction DIR>
void InternalDescriptorUnit<DIR>::BlankFillOutputRecord() {
if constexpr (DIR == Direction::Output) {
if (furthestPositionInRecord <
recordLength.value_or(furthestPositionInRecord)) {
BlankFill(CurrentRecord() + furthestPositionInRecord,
*recordLength - furthestPositionInRecord);
}
}
}
template <Direction DIR>
void InternalDescriptorUnit<DIR>::BackspaceRecord(IoErrorHandler &handler) {
RUNTIME_CHECK(handler, currentRecordNumber > 1);
--currentRecordNumber;
BeginRecord();
}
template <Direction DIR>
std::int64_t InternalDescriptorUnit<DIR>::InquirePos() {
return (currentRecordNumber - 1) * recordLength.value_or(0) +
positionInRecord + 1;
}
template class InternalDescriptorUnit<Direction::Output>;
template class InternalDescriptorUnit<Direction::Input>;
} // namespace Fortran::runtime::io
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