| 1 | //===-- runtime/internal-unit.h ---------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // Fortran internal I/O "units" |
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| 10 | |
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| 11 | #ifndef FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_ |
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| 12 | #define FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_ |
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| 13 | |
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| 14 | #include "connection.h" |
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| 15 | #include "flang/Runtime/descriptor.h" |
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| 16 | #include <cinttypes> |
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| 17 | #include <type_traits> |
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| 18 | |
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| 19 | namespace Fortran::runtime::io { |
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| 20 | |
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| 21 | class IoErrorHandler; |
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| 22 | |
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| 23 | // Points to (but does not own) a CHARACTER scalar or array for internal I/O. |
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| 24 | // Does not buffer. |
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| 25 | template <Direction DIR> class InternalDescriptorUnit : public ConnectionState { |
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| 26 | public: |
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| 27 | using Scalar = |
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| 28 | std::conditional_t<DIR == Direction::Input, const char *, char *>; |
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| 29 | InternalDescriptorUnit(Scalar, std::size_t chars, int kind); |
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| 30 | InternalDescriptorUnit(const Descriptor &, const Terminator &); |
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| 31 | void EndIoStatement(); |
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| 32 | |
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| 33 | bool Emit(const char *, std::size_t, IoErrorHandler &); |
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| 34 | std::size_t GetNextInputBytes(const char *&, IoErrorHandler &); |
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| 35 | bool AdvanceRecord(IoErrorHandler &); |
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| 36 | void BackspaceRecord(IoErrorHandler &); |
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| 37 | std::int64_t InquirePos(); |
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| 38 | |
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| 39 | private: |
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| 40 | Descriptor &descriptor() { return staticDescriptor_.descriptor(); } |
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| 41 | const Descriptor &descriptor() const { |
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| 42 | return staticDescriptor_.descriptor(); |
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| 43 | } |
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| 44 | Scalar CurrentRecord() const { |
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| 45 | return descriptor().template ZeroBasedIndexedElement<char>( |
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| 46 | currentRecordNumber - 1); |
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| 47 | } |
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| 48 | void BlankFill(char *, std::size_t); |
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| 49 | void BlankFillOutputRecord(); |
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| 50 | |
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| 51 | StaticDescriptor<maxRank, true /*addendum*/> staticDescriptor_; |
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| 52 | }; |
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| 53 | |
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| 54 | extern template class InternalDescriptorUnit<Direction::Output>; |
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| 55 | extern template class InternalDescriptorUnit<Direction::Input>; |
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| 56 | } // namespace Fortran::runtime::io |
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| 57 | #endif // FORTRAN_RUNTIME_IO_INTERNAL_UNIT_H_ |
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| 58 | |
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