ea7e50cdf2
Support the EX edit descriptor for hexadecimal real formatted output and hexadecimal real input for all forms of formatted input.. (We're possibly the first Fortran compiler to support this feature for input editing; only one other can handle EX output editing.) As true (not BOZ) hexadecimal floating-point constants are not supported in Fortran source code, only in formatted input, the implementation takes place in the I/O editing portion of the runtime, not as new conversions in the Decimal library.
138 lines
5.4 KiB
C++
138 lines
5.4 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 <int KIND>
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bool EditIntegerOutput(
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IoStatementState &, const DataEdit &, common::HostSignedIntType<8 * KIND>);
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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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// Returns null when the exponent overflows a fixed-size output field.
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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 ConvertToDecimal(
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int significantDigits, enum decimal::FortranRounding, int flags = 0);
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struct ConvertToHexadecimalResult {
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const char *str;
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int length;
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int exponent;
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};
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ConvertToHexadecimalResult ConvertToHexadecimal(
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int significantDigits, enum decimal::FortranRounding, 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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template <typename CHAR>
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bool ListDirectedCharacterOutput(IoStatementState &,
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ListDirectedStatementState<Direction::Output> &, const CHAR *,
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std::size_t chars);
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extern template bool ListDirectedCharacterOutput(IoStatementState &,
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ListDirectedStatementState<Direction::Output> &, const char *,
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std::size_t chars);
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extern template bool ListDirectedCharacterOutput(IoStatementState &,
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ListDirectedStatementState<Direction::Output> &, const char16_t *,
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std::size_t chars);
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extern template bool ListDirectedCharacterOutput(IoStatementState &,
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ListDirectedStatementState<Direction::Output> &, const char32_t *,
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std::size_t chars);
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template <typename CHAR>
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bool EditCharacterOutput(
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IoStatementState &, const DataEdit &, const CHAR *, std::size_t chars);
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extern template bool EditCharacterOutput(
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IoStatementState &, const DataEdit &, const char *, std::size_t chars);
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extern template bool EditCharacterOutput(
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IoStatementState &, const DataEdit &, const char16_t *, std::size_t chars);
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extern template bool EditCharacterOutput(
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IoStatementState &, const DataEdit &, const char32_t *, std::size_t chars);
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extern template bool EditIntegerOutput<1>(
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IoStatementState &, const DataEdit &, std::int8_t);
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extern template bool EditIntegerOutput<2>(
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IoStatementState &, const DataEdit &, std::int16_t);
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extern template bool EditIntegerOutput<4>(
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IoStatementState &, const DataEdit &, std::int32_t);
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extern template bool EditIntegerOutput<8>(
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IoStatementState &, const DataEdit &, std::int64_t);
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extern template bool EditIntegerOutput<16>(
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IoStatementState &, const DataEdit &, common::int128_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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