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llvm-project/flang/runtime/edit-output.cpp

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//===-- runtime/edit-output.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 "edit-output.h"
#include "utf.h"
#include "flang/Common/uint128.h"
#include <algorithm>
namespace Fortran::runtime::io {
template <int KIND>
bool EditIntegerOutput(IoStatementState &io, const DataEdit &edit,
common::HostSignedIntType<8 * KIND> n) {
char buffer[130], *end{&buffer[sizeof buffer]}, *p{end};
bool isNegative{n < 0};
using Unsigned = common::HostUnsignedIntType<8 * KIND>;
Unsigned un{static_cast<Unsigned>(n)};
int signChars{0};
switch (edit.descriptor) {
case DataEdit::ListDirected:
case 'G':
case 'I':
if (isNegative) {
un = -un;
}
if (isNegative || (edit.modes.editingFlags & signPlus)) {
signChars = 1; // '-' or '+'
}
while (un > 0) {
auto quotient{un / 10u};
*--p = '0' + static_cast<int>(un - Unsigned{10} * quotient);
un = quotient;
}
break;
case 'B':
for (; un > 0; un >>= 1) {
*--p = '0' + (static_cast<int>(un) & 1);
}
break;
case 'O':
for (; un > 0; un >>= 3) {
*--p = '0' + (static_cast<int>(un) & 7);
}
break;
case 'Z':
for (; un > 0; un >>= 4) {
int digit = static_cast<int>(un) & 0xf;
*--p = digit >= 10 ? 'A' + (digit - 10) : '0' + digit;
}
break;
case 'A': // legacy extension
return EditCharacterOutput(
io, edit, reinterpret_cast<char *>(&n), sizeof n);
default:
io.GetIoErrorHandler().SignalError(IostatErrorInFormat,
"Data edit descriptor '%c' may not be used with an INTEGER data item",
edit.descriptor);
return false;
}
int digits = end - p;
int leadingZeroes{0};
int editWidth{edit.width.value_or(0)};
if (edit.digits && digits <= *edit.digits) { // Iw.m
if (*edit.digits == 0 && n == 0) {
// Iw.0 with zero value: output field must be blank. For I0.0
// and a zero value, emit one blank character.
signChars = 0; // in case of SP
editWidth = std::max(1, editWidth);
} else {
leadingZeroes = *edit.digits - digits;
}
} else if (n == 0) {
leadingZeroes = 1;
}
int subTotal{signChars + leadingZeroes + digits};
int leadingSpaces{std::max(0, editWidth - subTotal)};
if (editWidth > 0 && leadingSpaces + subTotal > editWidth) {
return io.EmitRepeated('*', editWidth);
}
if (edit.IsListDirected()) {
int total{std::max(leadingSpaces, 1) + subTotal};
if (io.GetConnectionState().NeedAdvance(static_cast<std::size_t>(total)) &&
!io.AdvanceRecord()) {
return false;
}
leadingSpaces = 1;
}
return io.EmitRepeated(' ', leadingSpaces) &&
io.Emit(n < 0 ? "-" : "+", signChars) &&
io.EmitRepeated('0', leadingZeroes) && io.Emit(p, digits);
}
// Formats the exponent (see table 13.1 for all the cases)
const char *RealOutputEditingBase::FormatExponent(
int expo, const DataEdit &edit, int &length) {
char *eEnd{&exponent_[sizeof exponent_]};
char *exponent{eEnd};
for (unsigned e{static_cast<unsigned>(std::abs(expo))}; e > 0;) {
unsigned quotient{e / 10u};
*--exponent = '0' + e - 10 * quotient;
e = quotient;
}
if (edit.expoDigits) {
if (int ed{*edit.expoDigits}) { // Ew.dEe with e > 0
while (exponent > exponent_ + 2 /*E+*/ && exponent + ed > eEnd) {
*--exponent = '0';
}
} else if (exponent == eEnd) {
*--exponent = '0'; // Ew.dE0 with zero-valued exponent
}
} else { // ensure at least two exponent digits
while (exponent + 2 > eEnd) {
*--exponent = '0';
}
}
*--exponent = expo < 0 ? '-' : '+';
if (edit.expoDigits || edit.IsListDirected() || exponent + 3 == eEnd) {
*--exponent = edit.descriptor == 'D' ? 'D' : 'E'; // not 'G'
}
length = eEnd - exponent;
return exponent;
}
bool RealOutputEditingBase::EmitPrefix(
const DataEdit &edit, std::size_t length, std::size_t width) {
if (edit.IsListDirected()) {
int prefixLength{edit.descriptor == DataEdit::ListDirectedRealPart ? 2
: edit.descriptor == DataEdit::ListDirectedImaginaryPart ? 0
: 1};
int suffixLength{edit.descriptor == DataEdit::ListDirectedRealPart ||
edit.descriptor == DataEdit::ListDirectedImaginaryPart
? 1
: 0};
length += prefixLength + suffixLength;
ConnectionState &connection{io_.GetConnectionState()};
return (!connection.NeedAdvance(length) || io_.AdvanceRecord()) &&
io_.Emit(" (", prefixLength);
} else if (width > length) {
return io_.EmitRepeated(' ', width - length);
} else {
return true;
}
}
bool RealOutputEditingBase::EmitSuffix(const DataEdit &edit) {
if (edit.descriptor == DataEdit::ListDirectedRealPart) {
return io_.Emit(edit.modes.editingFlags & decimalComma ? ";" : ",", 1);
} else if (edit.descriptor == DataEdit::ListDirectedImaginaryPart) {
return io_.Emit(")", 1);
} else {
return true;
}
}
template <int binaryPrecision>
decimal::ConversionToDecimalResult RealOutputEditing<binaryPrecision>::Convert(
int significantDigits, enum decimal::FortranRounding rounding, int flags) {
auto converted{decimal::ConvertToDecimal<binaryPrecision>(buffer_,
sizeof buffer_, static_cast<enum decimal::DecimalConversionFlags>(flags),
significantDigits, rounding, x_)};
if (!converted.str) { // overflow
io_.GetIoErrorHandler().Crash(
"RealOutputEditing::Convert : buffer size %zd was insufficient",
sizeof buffer_);
}
return converted;
}
// 13.7.2.3.3 in F'2018
template <int binaryPrecision>
bool RealOutputEditing<binaryPrecision>::EditEorDOutput(const DataEdit &edit) {
int editDigits{edit.digits.value_or(0)}; // 'd' field
int editWidth{edit.width.value_or(0)}; // 'w' field
int significantDigits{editDigits};
int flags{0};
if (edit.modes.editingFlags & signPlus) {
flags |= decimal::AlwaysSign;
}
if (editWidth == 0) { // "the processor selects the field width"
if (edit.digits.has_value()) { // E0.d
editWidth = editDigits + 6; // -.666E+ee
} else { // E0
flags |= decimal::Minimize;
significantDigits =
sizeof buffer_ - 5; // sign, NUL, + 3 extra for EN scaling
}
}
bool isEN{edit.variation == 'N'};
bool isES{edit.variation == 'S'};
int scale{isEN || isES ? 1 : edit.modes.scale}; // 'kP' value
int zeroesAfterPoint{0};
if (scale < 0) {
zeroesAfterPoint = -scale;
significantDigits = std::max(0, significantDigits - zeroesAfterPoint);
} else if (scale > 0) {
++significantDigits;
scale = std::min(scale, significantDigits + 1);
}
// In EN editing, multiple attempts may be necessary, so it's in a loop.
while (true) {
decimal::ConversionToDecimalResult converted{
Convert(significantDigits, edit.modes.round, flags)};
if (IsInfOrNaN(converted)) {
return EmitPrefix(edit, converted.length, editWidth) &&
io_.Emit(converted.str, converted.length) && EmitSuffix(edit);
}
if (!IsZero()) {
converted.decimalExponent -= scale;
}
if (isEN && scale < 3 && (converted.decimalExponent % 3) != 0) {
// EN mode: boost the scale and significant digits, try again; need
// an effective exponent field that's a multiple of three.
++scale;
++significantDigits;
continue;
}
// Format the exponent (see table 13.1 for all the cases)
int expoLength{0};
const char *exponent{
FormatExponent(converted.decimalExponent, edit, expoLength)};
int signLength{*converted.str == '-' || *converted.str == '+' ? 1 : 0};
int convertedDigits{static_cast<int>(converted.length) - signLength};
int zeroesBeforePoint{std::max(0, scale - convertedDigits)};
int digitsBeforePoint{std::max(0, scale - zeroesBeforePoint)};
int digitsAfterPoint{convertedDigits - digitsBeforePoint};
int trailingZeroes{flags & decimal::Minimize
? 0
: std::max(0,
significantDigits - (convertedDigits + zeroesBeforePoint))};
int totalLength{signLength + digitsBeforePoint + zeroesBeforePoint +
1 /*'.'*/ + zeroesAfterPoint + digitsAfterPoint + trailingZeroes +
expoLength};
int width{editWidth > 0 ? editWidth : totalLength};
if (totalLength > width) {
return io_.EmitRepeated('*', width);
}
if (totalLength < width && digitsBeforePoint == 0 &&
zeroesBeforePoint == 0) {
zeroesBeforePoint = 1;
++totalLength;
}
return EmitPrefix(edit, totalLength, width) &&
io_.Emit(converted.str, signLength + digitsBeforePoint) &&
io_.EmitRepeated('0', zeroesBeforePoint) &&
io_.Emit(edit.modes.editingFlags & decimalComma ? "," : ".", 1) &&
io_.EmitRepeated('0', zeroesAfterPoint) &&
io_.Emit(
converted.str + signLength + digitsBeforePoint, digitsAfterPoint) &&
io_.EmitRepeated('0', trailingZeroes) &&
io_.Emit(exponent, expoLength) && EmitSuffix(edit);
}
}
// 13.7.2.3.2 in F'2018
template <int binaryPrecision>
bool RealOutputEditing<binaryPrecision>::EditFOutput(const DataEdit &edit) {
int fracDigits{edit.digits.value_or(0)}; // 'd' field
const int editWidth{edit.width.value_or(0)}; // 'w' field
enum decimal::FortranRounding rounding{edit.modes.round};
int flags{0};
if (edit.modes.editingFlags & signPlus) {
flags |= decimal::AlwaysSign;
}
if (editWidth == 0) { // "the processor selects the field width"
if (!edit.digits.has_value()) { // F0
flags |= decimal::Minimize;
fracDigits = sizeof buffer_ - 2; // sign & NUL
}
}
// Multiple conversions may be needed to get the right number of
// effective rounded fractional digits.
int extraDigits{0};
bool canIncrease{true};
while (true) {
decimal::ConversionToDecimalResult converted{
Convert(extraDigits + fracDigits, rounding, flags)};
if (IsInfOrNaN(converted)) {
return EmitPrefix(edit, converted.length, editWidth) &&
io_.Emit(converted.str, converted.length) && EmitSuffix(edit);
}
int expo{converted.decimalExponent + edit.modes.scale /*kP*/};
int signLength{*converted.str == '-' || *converted.str == '+' ? 1 : 0};
int convertedDigits{static_cast<int>(converted.length) - signLength};
if (IsZero()) { // don't treat converted "0" as significant digit
expo = 0;
convertedDigits = 0;
}
int trailingOnes{0};
if (expo > extraDigits && extraDigits >= 0 && canIncrease) {
extraDigits = expo;
if (!edit.digits.has_value()) { // F0
fracDigits = sizeof buffer_ - extraDigits - 2; // sign & NUL
}
canIncrease = false; // only once
continue;
} else if (expo == -fracDigits && convertedDigits > 0) {
if (rounding != decimal::FortranRounding::RoundToZero) {
// Convert again without rounding so that we can round here
rounding = decimal::FortranRounding::RoundToZero;
continue;
} else if (converted.str[signLength] >= '5') {
// Value rounds up to a scaled 1 (e.g., 0.06 for F5.1 -> 0.1)
++expo;
convertedDigits = 0;
trailingOnes = 1;
} else {
// Value rounds down to zero
expo = 0;
convertedDigits = 0;
}
} else if (expo < extraDigits && extraDigits > -fracDigits) {
extraDigits = std::max(expo, -fracDigits);
continue;
}
int digitsBeforePoint{std::max(0, std::min(expo, convertedDigits))};
int zeroesBeforePoint{std::max(0, expo - digitsBeforePoint)};
int zeroesAfterPoint{std::min(fracDigits, std::max(0, -expo))};
int digitsAfterPoint{convertedDigits - digitsBeforePoint};
int trailingZeroes{flags & decimal::Minimize
? 0
: std::max(0,
fracDigits -
(zeroesAfterPoint + digitsAfterPoint + trailingOnes))};
if (digitsBeforePoint + zeroesBeforePoint + zeroesAfterPoint +
digitsAfterPoint + trailingOnes + trailingZeroes ==
0) {
zeroesBeforePoint = 1; // "." -> "0."
}
int totalLength{signLength + digitsBeforePoint + zeroesBeforePoint +
1 /*'.'*/ + zeroesAfterPoint + digitsAfterPoint + trailingOnes +
trailingZeroes};
int width{editWidth > 0 ? editWidth : totalLength};
if (totalLength > width) {
return io_.EmitRepeated('*', width);
}
if (totalLength < width && digitsBeforePoint + zeroesBeforePoint == 0) {
zeroesBeforePoint = 1;
++totalLength;
}
return EmitPrefix(edit, totalLength, width) &&
io_.Emit(converted.str, signLength + digitsBeforePoint) &&
io_.EmitRepeated('0', zeroesBeforePoint) &&
io_.Emit(edit.modes.editingFlags & decimalComma ? "," : ".", 1) &&
io_.EmitRepeated('0', zeroesAfterPoint) &&
io_.Emit(
converted.str + signLength + digitsBeforePoint, digitsAfterPoint) &&
io_.EmitRepeated('1', trailingOnes) &&
io_.EmitRepeated('0', trailingZeroes) &&
io_.EmitRepeated(' ', trailingBlanks_) && EmitSuffix(edit);
}
}
// 13.7.5.2.3 in F'2018
template <int binaryPrecision>
DataEdit RealOutputEditing<binaryPrecision>::EditForGOutput(DataEdit edit) {
edit.descriptor = 'E';
int significantDigits{
edit.digits.value_or(BinaryFloatingPoint::decimalPrecision)}; // 'd'
if (!edit.width.has_value() || (*edit.width > 0 && significantDigits == 0)) {
return edit; // Gw.0 -> Ew.0 for w > 0
}
int flags{0};
if (edit.modes.editingFlags & signPlus) {
flags |= decimal::AlwaysSign;
}
decimal::ConversionToDecimalResult converted{
Convert(significantDigits, edit.modes.round, flags)};
if (IsInfOrNaN(converted)) {
return edit;
}
int expo{IsZero() ? 1 : converted.decimalExponent}; // 's'
if (expo < 0 || expo > significantDigits) {
return edit; // Ew.d
}
edit.descriptor = 'F';
edit.modes.scale = 0; // kP is ignored for G when no exponent field
trailingBlanks_ = 0;
int editWidth{edit.width.value_or(0)};
if (editWidth > 0) {
int expoDigits{edit.expoDigits.value_or(0)};
trailingBlanks_ = expoDigits > 0 ? expoDigits + 2 : 4; // 'n'
*edit.width = std::max(0, editWidth - trailingBlanks_);
}
if (edit.digits.has_value()) {
*edit.digits = std::max(0, *edit.digits - expo);
}
return edit;
}
// 13.10.4 in F'2018
template <int binaryPrecision>
bool RealOutputEditing<binaryPrecision>::EditListDirectedOutput(
const DataEdit &edit) {
decimal::ConversionToDecimalResult converted{Convert(1, edit.modes.round)};
if (IsInfOrNaN(converted)) {
return EditEorDOutput(edit);
}
int expo{converted.decimalExponent};
if (expo < 0 || expo > BinaryFloatingPoint::decimalPrecision) {
DataEdit copy{edit};
copy.modes.scale = 1; // 1P
return EditEorDOutput(copy);
}
return EditFOutput(edit);
}
// 13.7.5.2.6 in F'2018
template <int binaryPrecision>
bool RealOutputEditing<binaryPrecision>::EditEXOutput(const DataEdit &) {
io_.GetIoErrorHandler().Crash(
"not yet implemented: EX output editing"); // TODO
}
template <int KIND> bool RealOutputEditing<KIND>::Edit(const DataEdit &edit) {
switch (edit.descriptor) {
case 'D':
return EditEorDOutput(edit);
case 'E':
if (edit.variation == 'X') {
return EditEXOutput(edit);
} else {
return EditEorDOutput(edit);
}
case 'F':
return EditFOutput(edit);
case 'B':
case 'O':
case 'Z':
return EditIntegerOutput<KIND>(io_, edit,
static_cast<common::HostSignedIntType<8 * KIND>>(
decimal::BinaryFloatingPointNumber<binaryPrecision>{x_}.raw()));
case 'G':
return Edit(EditForGOutput(edit));
case 'A': // legacy extension
return EditCharacterOutput(
io_, edit, reinterpret_cast<char *>(&x_), sizeof x_);
default:
if (edit.IsListDirected()) {
return EditListDirectedOutput(edit);
}
io_.GetIoErrorHandler().SignalError(IostatErrorInFormat,
"Data edit descriptor '%c' may not be used with a REAL data item",
edit.descriptor);
return false;
}
return false;
}
bool ListDirectedLogicalOutput(IoStatementState &io,
ListDirectedStatementState<Direction::Output> &list, bool truth) {
return list.EmitLeadingSpaceOrAdvance(io) && io.Emit(truth ? "T" : "F", 1);
}
bool EditLogicalOutput(IoStatementState &io, const DataEdit &edit, bool truth) {
switch (edit.descriptor) {
case 'L':
case 'G':
return io.EmitRepeated(' ', std::max(0, edit.width.value_or(1) - 1)) &&
io.Emit(truth ? "T" : "F", 1);
default:
io.GetIoErrorHandler().SignalError(IostatErrorInFormat,
"Data edit descriptor '%c' may not be used with a LOGICAL data item",
edit.descriptor);
return false;
}
}
template <typename CHAR>
bool ListDirectedCharacterOutput(IoStatementState &io,
ListDirectedStatementState<Direction::Output> &list, const CHAR *x,
std::size_t length) {
bool ok{true};
MutableModes &modes{io.mutableModes()};
ConnectionState &connection{io.GetConnectionState()};
if (modes.delim) {
ok = ok && list.EmitLeadingSpaceOrAdvance(io);
// Value is delimited with ' or " marks, and interior
// instances of that character are doubled.
auto EmitOne{[&](CHAR ch) {
if (connection.NeedAdvance(1)) {
ok = ok && io.AdvanceRecord();
}
ok = ok && io.EmitEncoded(&ch, 1);
}};
EmitOne(modes.delim);
for (std::size_t j{0}; j < length; ++j) {
// Doubled delimiters must be put on the same record
// in order to be acceptable as list-directed or NAMELIST
// input; however, this requirement is not always possible
// when the records have a fixed length, as is the case with
// internal output. The standard is silent on what should
// happen, and no two extant Fortran implementations do
// the same thing when tested with this case.
// This runtime splits the doubled delimiters across
// two records for lack of a better alternative.
if (x[j] == static_cast<CHAR>(modes.delim)) {
EmitOne(x[j]);
}
EmitOne(x[j]);
}
EmitOne(modes.delim);
} else {
// Undelimited list-directed output
ok = ok && list.EmitLeadingSpaceOrAdvance(io, length > 0 ? 1 : 0, true);
std::size_t put{0};
std::size_t oneIfUTF8{connection.useUTF8<CHAR>() ? 1 : length};
while (ok && put < length) {
if (std::size_t chunk{std::min<std::size_t>(
std::min<std::size_t>(length - put, oneIfUTF8),
connection.RemainingSpaceInRecord())}) {
ok = io.EmitEncoded(x + put, chunk);
put += chunk;
} else {
ok = io.AdvanceRecord() && io.Emit(" ", 1);
}
}
list.set_lastWasUndelimitedCharacter(true);
}
return ok;
}
template <typename CHAR>
bool EditCharacterOutput(IoStatementState &io, const DataEdit &edit,
const CHAR *x, std::size_t length) {
switch (edit.descriptor) {
case 'A':
case 'G':
break;
default:
io.GetIoErrorHandler().SignalError(IostatErrorInFormat,
"Data edit descriptor '%c' may not be used with a CHARACTER data item",
edit.descriptor);
return false;
}
int len{static_cast<int>(length)};
int width{edit.width.value_or(len)};
return io.EmitRepeated(' ', std::max(0, width - len)) &&
io.EmitEncoded(x, std::min(width, len));
}
template bool EditIntegerOutput<1>(
IoStatementState &, const DataEdit &, std::int8_t);
template bool EditIntegerOutput<2>(
IoStatementState &, const DataEdit &, std::int16_t);
template bool EditIntegerOutput<4>(
IoStatementState &, const DataEdit &, std::int32_t);
template bool EditIntegerOutput<8>(
IoStatementState &, const DataEdit &, std::int64_t);
template bool EditIntegerOutput<16>(
IoStatementState &, const DataEdit &, common::int128_t);
template class RealOutputEditing<2>;
template class RealOutputEditing<3>;
template class RealOutputEditing<4>;
template class RealOutputEditing<8>;
template class RealOutputEditing<10>;
// TODO: double/double
template class RealOutputEditing<16>;
template bool ListDirectedCharacterOutput(IoStatementState &,
ListDirectedStatementState<Direction::Output> &, const char *,
std::size_t chars);
template bool ListDirectedCharacterOutput(IoStatementState &,
ListDirectedStatementState<Direction::Output> &, const char16_t *,
std::size_t chars);
template bool ListDirectedCharacterOutput(IoStatementState &,
ListDirectedStatementState<Direction::Output> &, const char32_t *,
std::size_t chars);
template bool EditCharacterOutput(
IoStatementState &, const DataEdit &, const char *, std::size_t chars);
template bool EditCharacterOutput(
IoStatementState &, const DataEdit &, const char16_t *, std::size_t chars);
template bool EditCharacterOutput(
IoStatementState &, const DataEdit &, const char32_t *, std::size_t chars);
} // namespace Fortran::runtime::io
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