d56fdc8e95
MSVC does not support a distinct 80-bit extended precision "long double" type. Rework the I/O runtime to avoid using native C/C++ type names. Centralize the mappings between the KIND= type parameters of REAL and their binary precisions in the common real.h header file, and use KIND type parameter values rather than binary precisions for clarity where appropriate. This patch, if successful, should obviate the need for Differential review D88511. (This patch anticipates a successful review of D88688, which fixes the function that maps each kind of real to its maximum number of significant decimal digits.) Differential revision: https://reviews.llvm.org/D88752
116 lines
4.3 KiB
C++
116 lines
4.3 KiB
C++
//===-- runtime/edit-output.h -----------------------------------*- C++ -*-===//
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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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#ifndef FORTRAN_RUNTIME_EDIT_OUTPUT_H_
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#define FORTRAN_RUNTIME_EDIT_OUTPUT_H_
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// Output data editing templates implementing the FORMAT data editing
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// descriptors E, EN, ES, EX, D, F, and G for REAL data (and COMPLEX
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// components, I and G for INTEGER, and B/O/Z for both.
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// See subclauses in 13.7.2.3 of Fortran 2018 for the
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// detailed specifications of these descriptors.
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// List-directed output (13.10.4) for numeric types is also done here.
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// Drives the same fast binary-to-decimal formatting templates used
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// in the f18 front-end.
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#include "format.h"
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#include "io-stmt.h"
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#include "flang/Common/uint128.h"
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#include "flang/Decimal/decimal.h"
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namespace Fortran::runtime::io {
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// I, B, O, Z, and G output editing for INTEGER.
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// The DataEdit reference is const here (and elsewhere in this header) so that
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// one edit descriptor with a repeat factor may safely serve to edit
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// multiple elements of an array.
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template <typename INT = std::int64_t, typename UINT = std::uint64_t>
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bool EditIntegerOutput(IoStatementState &, const DataEdit &, INT);
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// Encapsulates the state of a REAL output conversion.
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class RealOutputEditingBase {
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protected:
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explicit RealOutputEditingBase(IoStatementState &io) : io_{io} {}
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static bool IsInfOrNaN(const decimal::ConversionToDecimalResult &res) {
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const char *p{res.str};
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if (!p || res.length < 1) {
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return false;
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}
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if (*p == '-' || *p == '+') {
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if (res.length == 1) {
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return false;
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}
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++p;
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}
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return *p < '0' || *p > '9';
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}
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const char *FormatExponent(int, const DataEdit &edit, int &length);
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bool EmitPrefix(const DataEdit &, std::size_t length, std::size_t width);
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bool EmitSuffix(const DataEdit &);
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IoStatementState &io_;
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int trailingBlanks_{0}; // created when Gw editing maps to Fw
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char exponent_[16];
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};
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template <int KIND> class RealOutputEditing : public RealOutputEditingBase {
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public:
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static constexpr int binaryPrecision{common::PrecisionOfRealKind(KIND)};
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using BinaryFloatingPoint =
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decimal::BinaryFloatingPointNumber<binaryPrecision>;
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template <typename A>
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RealOutputEditing(IoStatementState &io, A x)
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: RealOutputEditingBase{io}, x_{x} {}
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bool Edit(const DataEdit &);
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private:
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// The DataEdit arguments here are const references or copies so that
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// the original DataEdit can safely serve multiple array elements when
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// it has a repeat count.
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bool EditEorDOutput(const DataEdit &);
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bool EditFOutput(const DataEdit &);
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DataEdit EditForGOutput(DataEdit); // returns an E or F edit
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bool EditEXOutput(const DataEdit &);
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bool EditListDirectedOutput(const DataEdit &);
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bool IsZero() const { return x_.IsZero(); }
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decimal::ConversionToDecimalResult Convert(
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int significantDigits, const DataEdit &, int flags = 0);
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BinaryFloatingPoint x_;
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char buffer_[BinaryFloatingPoint::maxDecimalConversionDigits +
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EXTRA_DECIMAL_CONVERSION_SPACE];
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};
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bool ListDirectedLogicalOutput(
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IoStatementState &, ListDirectedStatementState<Direction::Output> &, bool);
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bool EditLogicalOutput(IoStatementState &, const DataEdit &, bool);
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bool ListDirectedDefaultCharacterOutput(IoStatementState &,
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ListDirectedStatementState<Direction::Output> &, const char *, std::size_t);
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bool EditDefaultCharacterOutput(
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IoStatementState &, const DataEdit &, const char *, std::size_t);
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extern template bool EditIntegerOutput<std::int64_t, std::uint64_t>(
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IoStatementState &, const DataEdit &, std::int64_t);
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extern template bool EditIntegerOutput<common::uint128_t, common::uint128_t>(
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IoStatementState &, const DataEdit &, common::uint128_t);
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extern template class RealOutputEditing<2>;
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extern template class RealOutputEditing<3>;
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extern template class RealOutputEditing<4>;
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extern template class RealOutputEditing<8>;
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extern template class RealOutputEditing<10>;
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// TODO: double/double
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extern template class RealOutputEditing<16>;
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} // namespace Fortran::runtime::io
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#endif // FORTRAN_RUNTIME_EDIT_OUTPUT_H_
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