1//===-- lib/runtime/edit-output.h -------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef FLANG_RT_RUNTIME_EDIT_OUTPUT_H_
10#define FLANG_RT_RUNTIME_EDIT_OUTPUT_H_
11
12// Output data editing templates implementing the FORMAT data editing
13// descriptors E, EN, ES, EX, D, F, and G for REAL data (and COMPLEX
14// components, I and G for INTEGER, and B/O/Z for both.
15// See subclauses in 13.7.2.3 of Fortran 2018 for the
16// detailed specifications of these descriptors.
17// List-directed output (13.10.4) for numeric types is also done here.
18// Drives the same fast binary-to-decimal formatting templates used
19// in the f18 front-end.
20
21#include "flang-rt/runtime/format.h"
22#include "flang-rt/runtime/io-stmt.h"
23#include "flang/Common/uint128.h"
24#include "flang/Decimal/decimal.h"
25
26namespace Fortran::runtime::io {
27
28// I, B, O, Z, and G output editing for INTEGER.
29// The DataEdit reference is const here (and elsewhere in this header) so that
30// one edit descriptor with a repeat factor may safely serve to edit
31// multiple elements of an array.
32template <int KIND>
33RT_API_ATTRS bool EditIntegerOutput(IoStatementState &, const DataEdit &,
34 common::HostSignedIntType<8 * KIND>, bool isSigned);
35
36// Encapsulates the state of a REAL output conversion.
37class RealOutputEditingBase {
38protected:
39 explicit RT_API_ATTRS RealOutputEditingBase(IoStatementState &io) : io_{io} {}
40
41 // Returns null when the exponent overflows a fixed-size output field.
42 RT_API_ATTRS const char *FormatExponent(
43 int, const DataEdit &edit, int &length);
44 RT_API_ATTRS bool EmitPrefix(
45 const DataEdit &, std::size_t length, std::size_t width);
46 RT_API_ATTRS bool EmitSuffix(const DataEdit &);
47
48 IoStatementState &io_;
49 int trailingBlanks_{0}; // created when Gw editing maps to Fw
50 char exponent_[16];
51};
52
53template <int KIND> class RealOutputEditing : public RealOutputEditingBase {
54public:
55 RT_VAR_GROUP_BEGIN
56 static constexpr int binaryPrecision{common::PrecisionOfRealKind(KIND)};
57 RT_VAR_GROUP_END
58 using BinaryFloatingPoint =
59 decimal::BinaryFloatingPointNumber<binaryPrecision>;
60 template <typename A>
61 RT_API_ATTRS RealOutputEditing(IoStatementState &io, A x)
62 : RealOutputEditingBase{io}, x_{x} {}
63 RT_API_ATTRS bool Edit(const DataEdit &);
64
65private:
66 // The DataEdit arguments here are const references or copies so that
67 // the original DataEdit can safely serve multiple array elements when
68 // it has a repeat count.
69 RT_API_ATTRS bool EditEorDOutput(const DataEdit &);
70 RT_API_ATTRS bool EditFOutput(const DataEdit &);
71 RT_API_ATTRS DataEdit EditForGOutput(DataEdit); // returns an E or F edit
72 RT_API_ATTRS bool EditEXOutput(const DataEdit &);
73 RT_API_ATTRS bool EditListDirectedOutput(const DataEdit &);
74
75 RT_API_ATTRS bool IsZero() const { return x_.IsZero(); }
76
77 RT_API_ATTRS decimal::ConversionToDecimalResult ConvertToDecimal(
78 int significantDigits, enum decimal::FortranRounding, int flags = 0);
79
80 struct ConvertToHexadecimalResult {
81 const char *str;
82 int length;
83 int exponent;
84 };
85 RT_API_ATTRS ConvertToHexadecimalResult ConvertToHexadecimal(
86 int significantDigits, enum decimal::FortranRounding, int flags = 0);
87
88 BinaryFloatingPoint x_;
89 char buffer_[BinaryFloatingPoint::maxDecimalConversionDigits +
90 EXTRA_DECIMAL_CONVERSION_SPACE];
91};
92
93RT_API_ATTRS bool ListDirectedLogicalOutput(
94 IoStatementState &, ListDirectedStatementState<Direction::Output> &, bool);
95RT_API_ATTRS bool EditLogicalOutput(IoStatementState &, const DataEdit &, bool);
96
97template <typename CHAR>
98RT_API_ATTRS bool ListDirectedCharacterOutput(IoStatementState &,
99 ListDirectedStatementState<Direction::Output> &, const CHAR *,
100 std::size_t chars);
101extern template RT_API_ATTRS bool ListDirectedCharacterOutput(
102 IoStatementState &, ListDirectedStatementState<Direction::Output> &,
103 const char *, std::size_t chars);
104extern template RT_API_ATTRS bool ListDirectedCharacterOutput(
105 IoStatementState &, ListDirectedStatementState<Direction::Output> &,
106 const char16_t *, std::size_t chars);
107extern template RT_API_ATTRS bool ListDirectedCharacterOutput(
108 IoStatementState &, ListDirectedStatementState<Direction::Output> &,
109 const char32_t *, std::size_t chars);
110
111template <typename CHAR>
112RT_API_ATTRS bool EditCharacterOutput(
113 IoStatementState &, const DataEdit &, const CHAR *, std::size_t chars);
114extern template RT_API_ATTRS bool EditCharacterOutput(
115 IoStatementState &, const DataEdit &, const char *, std::size_t chars);
116extern template RT_API_ATTRS bool EditCharacterOutput(
117 IoStatementState &, const DataEdit &, const char16_t *, std::size_t chars);
118extern template RT_API_ATTRS bool EditCharacterOutput(
119 IoStatementState &, const DataEdit &, const char32_t *, std::size_t chars);
120
121extern template RT_API_ATTRS bool EditIntegerOutput<1>(
122 IoStatementState &, const DataEdit &, std::int8_t, bool);
123extern template RT_API_ATTRS bool EditIntegerOutput<2>(
124 IoStatementState &, const DataEdit &, std::int16_t, bool);
125extern template RT_API_ATTRS bool EditIntegerOutput<4>(
126 IoStatementState &, const DataEdit &, std::int32_t, bool);
127extern template RT_API_ATTRS bool EditIntegerOutput<8>(
128 IoStatementState &, const DataEdit &, std::int64_t, bool);
129extern template RT_API_ATTRS bool EditIntegerOutput<16>(
130 IoStatementState &, const DataEdit &, common::int128_t, bool);
131
132extern template class RealOutputEditing<2>;
133extern template class RealOutputEditing<3>;
134extern template class RealOutputEditing<4>;
135extern template class RealOutputEditing<8>;
136extern template class RealOutputEditing<10>;
137// TODO: double/double
138extern template class RealOutputEditing<16>;
139
140} // namespace Fortran::runtime::io
141#endif // FLANG_RT_RUNTIME_EDIT_OUTPUT_H_
142

source code of flang-rt/lib/runtime/edit-output.h