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| 1 | +//===-- runtime/descriptor-io.cpp -----------------------------------------===// |
| 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 | +#include "descriptor-io.h" |
| 10 | + |
| 11 | +namespace Fortran::runtime::io::descr { |
| 12 | + |
| 13 | +// User-defined derived type formatted I/O (maybe) |
| 14 | +std::optional<bool> DefinedFormattedIo(IoStatementState &io, |
| 15 | + const Descriptor &descriptor, const typeInfo::SpecialBinding &special) { |
| 16 | + std::optional<DataEdit> peek{io.GetNextDataEdit(0 /*to peek at it*/)}; |
| 17 | + if (peek && |
| 18 | + (peek->descriptor == DataEdit::DefinedDerivedType || |
| 19 | + peek->descriptor == DataEdit::ListDirected)) { |
| 20 | + // User-defined derived type formatting |
| 21 | + IoErrorHandler &handler{io.GetIoErrorHandler()}; |
| 22 | + DataEdit edit{*io.GetNextDataEdit()}; // consume it this time |
| 23 | + RUNTIME_CHECK(handler, edit.descriptor == peek->descriptor); |
| 24 | + char ioType[2 + edit.maxIoTypeChars]; |
| 25 | + auto ioTypeLen{std::size_t{2} /*"DT"*/ + edit.ioTypeChars}; |
| 26 | + if (edit.descriptor == DataEdit::DefinedDerivedType) { |
| 27 | + ioType[0] = 'D'; |
| 28 | + ioType[1] = 'T'; |
| 29 | + std::memcpy(ioType + 2, edit.ioType, edit.ioTypeChars); |
| 30 | + } else { |
| 31 | + std::strcpy( |
| 32 | + ioType, io.mutableModes().inNamelist ? "NAMELIST" : "LISTDIRECTED"); |
| 33 | + ioTypeLen = std::strlen(ioType); |
| 34 | + } |
| 35 | + StaticDescriptor<0, true> statDesc; |
| 36 | + Descriptor &vListDesc{statDesc.descriptor()}; |
| 37 | + vListDesc.Establish(TypeCategory::Integer, sizeof(int), nullptr, 1); |
| 38 | + vListDesc.set_base_addr(edit.vList); |
| 39 | + vListDesc.GetDimension(0).SetBounds(1, edit.vListEntries); |
| 40 | + vListDesc.GetDimension(0).SetByteStride( |
| 41 | + static_cast<SubscriptValue>(sizeof(int))); |
| 42 | + ExternalFileUnit *actualExternal{io.GetExternalFileUnit()}; |
| 43 | + ExternalFileUnit *external{actualExternal}; |
| 44 | + if (!external) { |
| 45 | + // Create a new unit to service defined I/O for an |
| 46 | + // internal I/O parent. |
| 47 | + external = &ExternalFileUnit::NewUnit(handler, true); |
| 48 | + } |
| 49 | + ChildIo &child{external->PushChildIo(io)}; |
| 50 | + int unit{external->unitNumber()}; |
| 51 | + int ioStat{IostatOk}; |
| 52 | + char ioMsg[100]; |
| 53 | + if (special.IsArgDescriptor(0)) { |
| 54 | + auto *p{special.GetProc<void (*)(const Descriptor &, int &, char *, |
| 55 | + const Descriptor &, int &, char *, std::size_t, std::size_t)>()}; |
| 56 | + p(descriptor, unit, ioType, vListDesc, ioStat, ioMsg, ioTypeLen, |
| 57 | + sizeof ioMsg); |
| 58 | + } else { |
| 59 | + auto *p{special.GetProc<void (*)(const void *, int &, char *, |
| 60 | + const Descriptor &, int &, char *, std::size_t, std::size_t)>()}; |
| 61 | + p(descriptor.raw().base_addr, unit, ioType, vListDesc, ioStat, ioMsg, |
| 62 | + ioTypeLen, sizeof ioMsg); |
| 63 | + } |
| 64 | + handler.Forward(ioStat, ioMsg, sizeof ioMsg); |
| 65 | + external->PopChildIo(child); |
| 66 | + if (!actualExternal) { |
| 67 | + // Close unit created for internal I/O above. |
| 68 | + auto *closing{external->LookUpForClose(external->unitNumber())}; |
| 69 | + RUNTIME_CHECK(handler, external == closing); |
| 70 | + external->DestroyClosed(); |
| 71 | + } |
| 72 | + return handler.GetIoStat() == IostatOk; |
| 73 | + } else { |
| 74 | + // There's a user-defined I/O subroutine, but there's a FORMAT present and |
| 75 | + // it does not have a DT data edit descriptor, so apply default formatting |
| 76 | + // to the components of the derived type as usual. |
| 77 | + return std::nullopt; |
| 78 | + } |
| 79 | +} |
| 80 | + |
| 81 | +// User-defined derived type unformatted I/O |
| 82 | +bool DefinedUnformattedIo(IoStatementState &io, const Descriptor &descriptor, |
| 83 | + const typeInfo::SpecialBinding &special) { |
| 84 | + // Unformatted I/O must have an external unit (or child thereof). |
| 85 | + IoErrorHandler &handler{io.GetIoErrorHandler()}; |
| 86 | + ExternalFileUnit *external{io.GetExternalFileUnit()}; |
| 87 | + RUNTIME_CHECK(handler, external != nullptr); |
| 88 | + ChildIo &child{external->PushChildIo(io)}; |
| 89 | + int unit{external->unitNumber()}; |
| 90 | + int ioStat{IostatOk}; |
| 91 | + char ioMsg[100]; |
| 92 | + if (special.IsArgDescriptor(0)) { |
| 93 | + auto *p{special.GetProc<void (*)( |
| 94 | + const Descriptor &, int &, int &, char *, std::size_t)>()}; |
| 95 | + p(descriptor, unit, ioStat, ioMsg, sizeof ioMsg); |
| 96 | + } else { |
| 97 | + auto *p{special.GetProc<void (*)( |
| 98 | + const void *, int &, int &, char *, std::size_t)>()}; |
| 99 | + p(descriptor.raw().base_addr, unit, ioStat, ioMsg, sizeof ioMsg); |
| 100 | + } |
| 101 | + handler.Forward(ioStat, ioMsg, sizeof ioMsg); |
| 102 | + external->PopChildIo(child); |
| 103 | + return handler.GetIoStat() == IostatOk; |
| 104 | +} |
| 105 | + |
| 106 | +} // namespace Fortran::runtime::io::descr |
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