1 //===-- lib/Evaluate/variable.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 "flang/Evaluate/variable.h"
10 #include "flang/Common/idioms.h"
11 #include "flang/Evaluate/check-expression.h"
12 #include "flang/Evaluate/fold.h"
13 #include "flang/Evaluate/tools.h"
14 #include "flang/Parser/char-block.h"
15 #include "flang/Parser/characters.h"
16 #include "flang/Parser/message.h"
17 #include "flang/Semantics/symbol.h"
18 #include <type_traits>
19 
20 using namespace Fortran::parser::literals;
21 
22 namespace Fortran::evaluate {
23 
24 // Constructors, accessors, mutators
25 
26 Triplet::Triplet() : stride_{Expr<SubscriptInteger>{1}} {}
27 
28 Triplet::Triplet(std::optional<Expr<SubscriptInteger>> &&l,
29     std::optional<Expr<SubscriptInteger>> &&u,
30     std::optional<Expr<SubscriptInteger>> &&s)
31     : stride_{s ? std::move(*s) : Expr<SubscriptInteger>{1}} {
32   if (l) {
33     lower_.emplace(std::move(*l));
34   }
35   if (u) {
36     upper_.emplace(std::move(*u));
37   }
38 }
39 
40 std::optional<Expr<SubscriptInteger>> Triplet::lower() const {
41   if (lower_) {
42     return {lower_.value().value()};
43   }
44   return std::nullopt;
45 }
46 
47 Triplet &Triplet::set_lower(Expr<SubscriptInteger> &&expr) {
48   lower_.emplace(std::move(expr));
49   return *this;
50 }
51 
52 std::optional<Expr<SubscriptInteger>> Triplet::upper() const {
53   if (upper_) {
54     return {upper_.value().value()};
55   }
56   return std::nullopt;
57 }
58 
59 Triplet &Triplet::set_upper(Expr<SubscriptInteger> &&expr) {
60   upper_.emplace(std::move(expr));
61   return *this;
62 }
63 
64 Expr<SubscriptInteger> Triplet::stride() const { return stride_.value(); }
65 
66 Triplet &Triplet::set_stride(Expr<SubscriptInteger> &&expr) {
67   stride_.value() = std::move(expr);
68   return *this;
69 }
70 
71 bool Triplet::IsStrideOne() const {
72   if (auto stride{ToInt64(stride_.value())}) {
73     return stride == 1;
74   } else {
75     return false;
76   }
77 }
78 
79 CoarrayRef::CoarrayRef(SymbolVector &&base, std::vector<Subscript> &&ss,
80     std::vector<Expr<SubscriptInteger>> &&css)
81     : base_{std::move(base)}, subscript_(std::move(ss)),
82       cosubscript_(std::move(css)) {
83   CHECK(!base_.empty());
84   CHECK(!cosubscript_.empty());
85 }
86 
87 std::optional<Expr<SomeInteger>> CoarrayRef::stat() const {
88   if (stat_) {
89     return stat_.value().value();
90   } else {
91     return std::nullopt;
92   }
93 }
94 
95 std::optional<Expr<SomeInteger>> CoarrayRef::team() const {
96   if (team_) {
97     return team_.value().value();
98   } else {
99     return std::nullopt;
100   }
101 }
102 
103 CoarrayRef &CoarrayRef::set_stat(Expr<SomeInteger> &&v) {
104   CHECK(IsVariable(v));
105   stat_.emplace(std::move(v));
106   return *this;
107 }
108 
109 CoarrayRef &CoarrayRef::set_team(Expr<SomeInteger> &&v, bool isTeamNumber) {
110   CHECK(IsVariable(v));
111   team_.emplace(std::move(v));
112   teamIsTeamNumber_ = isTeamNumber;
113   return *this;
114 }
115 
116 const Symbol &CoarrayRef::GetFirstSymbol() const { return base_.front(); }
117 
118 const Symbol &CoarrayRef::GetLastSymbol() const { return base_.back(); }
119 
120 void Substring::SetBounds(std::optional<Expr<SubscriptInteger>> &lower,
121     std::optional<Expr<SubscriptInteger>> &upper) {
122   if (lower) {
123     set_lower(std::move(lower.value()));
124   }
125   if (upper) {
126     set_upper(std::move(upper.value()));
127   }
128 }
129 
130 Expr<SubscriptInteger> Substring::lower() const {
131   if (lower_) {
132     return lower_.value().value();
133   } else {
134     return AsExpr(Constant<SubscriptInteger>{1});
135   }
136 }
137 
138 Substring &Substring::set_lower(Expr<SubscriptInteger> &&expr) {
139   lower_.emplace(std::move(expr));
140   return *this;
141 }
142 
143 std::optional<Expr<SubscriptInteger>> Substring::upper() const {
144   if (upper_) {
145     return upper_.value().value();
146   } else {
147     return std::visit(
148         common::visitors{
149             [](const DataRef &dataRef) { return dataRef.LEN(); },
150             [](const StaticDataObject::Pointer &object)
151                 -> std::optional<Expr<SubscriptInteger>> {
152               return AsExpr(Constant<SubscriptInteger>{object->data().size()});
153             },
154         },
155         parent_);
156   }
157 }
158 
159 Substring &Substring::set_upper(Expr<SubscriptInteger> &&expr) {
160   upper_.emplace(std::move(expr));
161   return *this;
162 }
163 
164 std::optional<Expr<SomeCharacter>> Substring::Fold(FoldingContext &context) {
165   if (!lower_) {
166     lower_ = AsExpr(Constant<SubscriptInteger>{1});
167   }
168   lower_.value() = evaluate::Fold(context, std::move(lower_.value().value()));
169   std::optional<ConstantSubscript> lbi{ToInt64(lower_.value().value())};
170   if (lbi && *lbi < 1) {
171     context.messages().Say(
172         "Lower bound (%jd) on substring is less than one"_en_US, *lbi);
173     *lbi = 1;
174     lower_ = AsExpr(Constant<SubscriptInteger>{1});
175   }
176   if (!upper_) {
177     upper_ = upper();
178     if (!upper_) {
179       return std::nullopt;
180     }
181   }
182   upper_.value() = evaluate::Fold(context, std::move(upper_.value().value()));
183   if (std::optional<ConstantSubscript> ubi{ToInt64(upper_.value().value())}) {
184     auto *literal{std::get_if<StaticDataObject::Pointer>(&parent_)};
185     std::optional<ConstantSubscript> length;
186     if (literal) {
187       length = (*literal)->data().size();
188     } else if (const Symbol * symbol{GetLastSymbol()}) {
189       if (const semantics::DeclTypeSpec * type{symbol->GetType()}) {
190         if (type->category() == semantics::DeclTypeSpec::Character) {
191           length = ToInt64(type->characterTypeSpec().length().GetExplicit());
192         }
193       }
194     }
195     if (*ubi < 1 || (lbi && *ubi < *lbi)) {
196       // Zero-length string: canonicalize
197       *lbi = 1, *ubi = 0;
198       lower_ = AsExpr(Constant<SubscriptInteger>{*lbi});
199       upper_ = AsExpr(Constant<SubscriptInteger>{*ubi});
200     } else if (length && *ubi > *length) {
201       context.messages().Say("Upper bound (%jd) on substring is greater "
202                              "than character length (%jd)"_en_US,
203           *ubi, *length);
204       *ubi = *length;
205     }
206     if (lbi && literal) {
207       auto newStaticData{StaticDataObject::Create()};
208       auto items{0}; // If the lower bound is greater, the length is 0
209       if (*ubi >= *lbi) {
210         items = *ubi - *lbi + 1;
211       }
212       auto width{(*literal)->itemBytes()};
213       auto bytes{items * width};
214       auto startByte{(*lbi - 1) * width};
215       const auto *from{&(*literal)->data()[0] + startByte};
216       for (auto j{0}; j < bytes; ++j) {
217         newStaticData->data().push_back(from[j]);
218       }
219       parent_ = newStaticData;
220       lower_ = AsExpr(Constant<SubscriptInteger>{1});
221       ConstantSubscript length = newStaticData->data().size();
222       upper_ = AsExpr(Constant<SubscriptInteger>{length});
223       switch (width) {
224       case 1:
225         return {
226             AsCategoryExpr(AsExpr(Constant<Type<TypeCategory::Character, 1>>{
227                 *newStaticData->AsString()}))};
228       case 2:
229         return {AsCategoryExpr(Constant<Type<TypeCategory::Character, 2>>{
230             *newStaticData->AsU16String()})};
231       case 4:
232         return {AsCategoryExpr(Constant<Type<TypeCategory::Character, 4>>{
233             *newStaticData->AsU32String()})};
234       default:
235         CRASH_NO_CASE;
236       }
237     }
238   }
239   return std::nullopt;
240 }
241 
242 DescriptorInquiry::DescriptorInquiry(
243     const NamedEntity &base, Field field, int dim)
244     : base_{base}, field_{field}, dimension_{dim} {
245   const Symbol &last{base_.GetLastSymbol()};
246   CHECK(IsDescriptor(last));
247   CHECK((field == Field::Len && dim == 0) ||
248       (field != Field::Len && dim >= 0 && dim < last.Rank()));
249 }
250 
251 DescriptorInquiry::DescriptorInquiry(NamedEntity &&base, Field field, int dim)
252     : base_{std::move(base)}, field_{field}, dimension_{dim} {
253   const Symbol &last{base_.GetLastSymbol()};
254   CHECK(IsDescriptor(last));
255   CHECK((field == Field::Len && dim == 0) ||
256       (field != Field::Len && dim >= 0 && dim < last.Rank()));
257 }
258 
259 // LEN()
260 static std::optional<Expr<SubscriptInteger>> SymbolLEN(const Symbol &sym) {
261   if (auto dyType{DynamicType::From(sym)}) {
262     if (const semantics::ParamValue * len{dyType->charLength()}) {
263       if (len->isExplicit()) {
264         if (auto intExpr{len->GetExplicit()}) {
265           if (IsConstantExpr(*intExpr)) {
266             return ConvertToType<SubscriptInteger>(*std::move(intExpr));
267           }
268         }
269       }
270       return Expr<SubscriptInteger>{
271           DescriptorInquiry{NamedEntity{sym}, DescriptorInquiry::Field::Len}};
272     }
273   }
274   return std::nullopt;
275 }
276 
277 std::optional<Expr<SubscriptInteger>> BaseObject::LEN() const {
278   return std::visit(
279       common::visitors{
280           [](const Symbol &symbol) { return SymbolLEN(symbol); },
281           [](const StaticDataObject::Pointer &object)
282               -> std::optional<Expr<SubscriptInteger>> {
283             return AsExpr(Constant<SubscriptInteger>{object->data().size()});
284           },
285       },
286       u);
287 }
288 
289 std::optional<Expr<SubscriptInteger>> Component::LEN() const {
290   return SymbolLEN(GetLastSymbol());
291 }
292 
293 std::optional<Expr<SubscriptInteger>> NamedEntity::LEN() const {
294   return SymbolLEN(GetLastSymbol());
295 }
296 
297 std::optional<Expr<SubscriptInteger>> ArrayRef::LEN() const {
298   return base_.LEN();
299 }
300 
301 std::optional<Expr<SubscriptInteger>> CoarrayRef::LEN() const {
302   return SymbolLEN(GetLastSymbol());
303 }
304 
305 std::optional<Expr<SubscriptInteger>> DataRef::LEN() const {
306   return std::visit(common::visitors{
307                         [](SymbolRef symbol) { return SymbolLEN(symbol); },
308                         [](const auto &x) { return x.LEN(); },
309                     },
310       u);
311 }
312 
313 std::optional<Expr<SubscriptInteger>> Substring::LEN() const {
314   if (auto top{upper()}) {
315     return AsExpr(Extremum<SubscriptInteger>{Ordering::Greater,
316         AsExpr(Constant<SubscriptInteger>{0}),
317         *std::move(top) - lower() + AsExpr(Constant<SubscriptInteger>{1})});
318   } else {
319     return std::nullopt;
320   }
321 }
322 
323 template <typename T>
324 std::optional<Expr<SubscriptInteger>> Designator<T>::LEN() const {
325   if constexpr (T::category == TypeCategory::Character) {
326     return std::visit(common::visitors{
327                           [](SymbolRef symbol) { return SymbolLEN(symbol); },
328                           [](const auto &x) { return x.LEN(); },
329                       },
330         u);
331   } else {
332     common::die("Designator<non-char>::LEN() called");
333     return std::nullopt;
334   }
335 }
336 
337 std::optional<Expr<SubscriptInteger>> ProcedureDesignator::LEN() const {
338   using T = std::optional<Expr<SubscriptInteger>>;
339   return std::visit(
340       common::visitors{
341           [](SymbolRef symbol) -> T { return SymbolLEN(symbol); },
342           [](const common::CopyableIndirection<Component> &c) -> T {
343             return c.value().LEN();
344           },
345           [](const SpecificIntrinsic &i) -> T {
346             if (i.name == "char") {
347               return Expr<SubscriptInteger>{1};
348             }
349             // Some other cases whose results' lengths can be determined
350             // from the lengths of their arguments are handled in
351             // ProcedureRef::LEN().
352             return std::nullopt;
353           },
354       },
355       u);
356 }
357 
358 // Rank()
359 int BaseObject::Rank() const {
360   return std::visit(common::visitors{
361                         [](SymbolRef symbol) { return symbol->Rank(); },
362                         [](const StaticDataObject::Pointer &) { return 0; },
363                     },
364       u);
365 }
366 
367 int Component::Rank() const {
368   if (int rank{symbol_->Rank()}; rank > 0) {
369     return rank;
370   }
371   return base().Rank();
372 }
373 
374 int NamedEntity::Rank() const {
375   return std::visit(common::visitors{
376                         [](const SymbolRef s) { return s->Rank(); },
377                         [](const Component &c) { return c.Rank(); },
378                     },
379       u_);
380 }
381 
382 int Subscript::Rank() const {
383   return std::visit(common::visitors{
384                         [](const IndirectSubscriptIntegerExpr &x) {
385                           return x.value().Rank();
386                         },
387                         [](const Triplet &) { return 1; },
388                     },
389       u);
390 }
391 
392 int ArrayRef::Rank() const {
393   int rank{0};
394   for (const auto &expr : subscript_) {
395     rank += expr.Rank();
396   }
397   if (rank > 0) {
398     return rank;
399   } else if (const Component * component{base_.UnwrapComponent()}) {
400     return component->base().Rank();
401   } else {
402     return 0;
403   }
404 }
405 
406 int CoarrayRef::Rank() const {
407   if (!subscript_.empty()) {
408     int rank{0};
409     for (const auto &expr : subscript_) {
410       rank += expr.Rank();
411     }
412     return rank;
413   } else {
414     return base_.back()->Rank();
415   }
416 }
417 
418 int DataRef::Rank() const {
419   return std::visit(common::visitors{
420                         [](SymbolRef symbol) { return symbol->Rank(); },
421                         [](const auto &x) { return x.Rank(); },
422                     },
423       u);
424 }
425 
426 int Substring::Rank() const {
427   return std::visit(common::visitors{
428                         [](const DataRef &dataRef) { return dataRef.Rank(); },
429                         [](const StaticDataObject::Pointer &) { return 0; },
430                     },
431       parent_);
432 }
433 
434 int ComplexPart::Rank() const { return complex_.Rank(); }
435 
436 template <typename T> int Designator<T>::Rank() const {
437   return std::visit(common::visitors{
438                         [](SymbolRef symbol) { return symbol->Rank(); },
439                         [](const auto &x) { return x.Rank(); },
440                     },
441       u);
442 }
443 
444 // GetBaseObject(), GetFirstSymbol(), GetLastSymbol(), &c.
445 const Symbol &Component::GetFirstSymbol() const {
446   return base_.value().GetFirstSymbol();
447 }
448 
449 const Symbol &NamedEntity::GetFirstSymbol() const {
450   return std::visit(common::visitors{
451                         [](SymbolRef s) -> const Symbol & { return s; },
452                         [](const Component &c) -> const Symbol & {
453                           return c.GetFirstSymbol();
454                         },
455                     },
456       u_);
457 }
458 
459 const Symbol &NamedEntity::GetLastSymbol() const {
460   return std::visit(common::visitors{
461                         [](SymbolRef s) -> const Symbol & { return s; },
462                         [](const Component &c) -> const Symbol & {
463                           return c.GetLastSymbol();
464                         },
465                     },
466       u_);
467 }
468 
469 const Component *NamedEntity::UnwrapComponent() const {
470   return std::visit(common::visitors{
471                         [](SymbolRef) -> const Component * { return nullptr; },
472                         [](const Component &c) { return &c; },
473                     },
474       u_);
475 }
476 
477 Component *NamedEntity::UnwrapComponent() {
478   return std::visit(common::visitors{
479                         [](SymbolRef &) -> Component * { return nullptr; },
480                         [](Component &c) { return &c; },
481                     },
482       u_);
483 }
484 
485 const Symbol &ArrayRef::GetFirstSymbol() const {
486   return base_.GetFirstSymbol();
487 }
488 
489 const Symbol &ArrayRef::GetLastSymbol() const { return base_.GetLastSymbol(); }
490 
491 const Symbol &DataRef::GetFirstSymbol() const {
492   return *std::visit(common::visitors{
493                          [](SymbolRef symbol) { return &*symbol; },
494                          [](const auto &x) { return &x.GetFirstSymbol(); },
495                      },
496       u);
497 }
498 
499 const Symbol &DataRef::GetLastSymbol() const {
500   return *std::visit(common::visitors{
501                          [](SymbolRef symbol) { return &*symbol; },
502                          [](const auto &x) { return &x.GetLastSymbol(); },
503                      },
504       u);
505 }
506 
507 BaseObject Substring::GetBaseObject() const {
508   return std::visit(common::visitors{
509                         [](const DataRef &dataRef) {
510                           return BaseObject{dataRef.GetFirstSymbol()};
511                         },
512                         [](StaticDataObject::Pointer pointer) {
513                           return BaseObject{std::move(pointer)};
514                         },
515                     },
516       parent_);
517 }
518 
519 const Symbol *Substring::GetLastSymbol() const {
520   return std::visit(
521       common::visitors{
522           [](const DataRef &dataRef) { return &dataRef.GetLastSymbol(); },
523           [](const auto &) -> const Symbol * { return nullptr; },
524       },
525       parent_);
526 }
527 
528 template <typename T> BaseObject Designator<T>::GetBaseObject() const {
529   return std::visit(
530       common::visitors{
531           [](SymbolRef symbol) { return BaseObject{symbol}; },
532           [](const Substring &sstring) { return sstring.GetBaseObject(); },
533           [](const auto &x) {
534 #if !__clang__ && __GNUC__ == 7 && __GNUC_MINOR__ == 2
535             if constexpr (std::is_same_v<std::decay_t<decltype(x)>,
536                               Substring>) {
537               return x.GetBaseObject();
538             } else
539 #endif
540               return BaseObject{x.GetFirstSymbol()};
541           },
542       },
543       u);
544 }
545 
546 template <typename T> const Symbol *Designator<T>::GetLastSymbol() const {
547   return std::visit(
548       common::visitors{
549           [](SymbolRef symbol) { return &*symbol; },
550           [](const Substring &sstring) { return sstring.GetLastSymbol(); },
551           [](const auto &x) {
552 #if !__clang__ && __GNUC__ == 7 && __GNUC_MINOR__ == 2
553             if constexpr (std::is_same_v<std::decay_t<decltype(x)>,
554                               Substring>) {
555               return x.GetLastSymbol();
556             } else
557 #endif
558               return &x.GetLastSymbol();
559           },
560       },
561       u);
562 }
563 
564 template <typename T>
565 std::optional<DynamicType> Designator<T>::GetType() const {
566   if constexpr (IsLengthlessIntrinsicType<Result>) {
567     return Result::GetType();
568   } else if (const Symbol * symbol{GetLastSymbol()}) {
569     return DynamicType::From(*symbol);
570   } else if constexpr (Result::category == TypeCategory::Character) {
571     if (const Substring * substring{std::get_if<Substring>(&u)}) {
572       const auto *parent{substring->GetParentIf<StaticDataObject::Pointer>()};
573       CHECK(parent);
574       return DynamicType{TypeCategory::Character, (*parent)->itemBytes()};
575     }
576   }
577   return std::nullopt;
578 }
579 
580 static NamedEntity AsNamedEntity(const SymbolVector &x) {
581   CHECK(!x.empty());
582   NamedEntity result{x.front()};
583   int j{0};
584   for (const Symbol &symbol : x) {
585     if (j++ != 0) {
586       DataRef base{result.IsSymbol() ? DataRef{result.GetLastSymbol()}
587                                      : DataRef{result.GetComponent()}};
588       result = NamedEntity{Component{std::move(base), symbol}};
589     }
590   }
591   return result;
592 }
593 
594 NamedEntity CoarrayRef::GetBase() const { return AsNamedEntity(base_); }
595 
596 // Equality testing
597 
598 // For the purposes of comparing type parameter expressions while
599 // testing the compatibility of procedure characteristics, two
600 // object dummy arguments with the same name are considered equal.
601 static bool AreSameSymbol(const Symbol &x, const Symbol &y) {
602   if (&x == &y) {
603     return true;
604   }
605   if (x.name() == y.name()) {
606     if (const auto *xObject{x.detailsIf<semantics::ObjectEntityDetails>()}) {
607       if (const auto *yObject{y.detailsIf<semantics::ObjectEntityDetails>()}) {
608         return xObject->isDummy() && yObject->isDummy();
609       }
610     }
611   }
612   return false;
613 }
614 
615 // Implements operator==() for a union type, using special case handling
616 // for Symbol references.
617 template <typename A> static bool TestVariableEquality(const A &x, const A &y) {
618   const SymbolRef *xSymbol{std::get_if<SymbolRef>(&x.u)};
619   if (const SymbolRef * ySymbol{std::get_if<SymbolRef>(&y.u)}) {
620     return xSymbol && AreSameSymbol(*xSymbol, *ySymbol);
621   } else {
622     return x.u == y.u;
623   }
624 }
625 
626 bool BaseObject::operator==(const BaseObject &that) const {
627   return TestVariableEquality(*this, that);
628 }
629 bool Component::operator==(const Component &that) const {
630   return base_ == that.base_ && &*symbol_ == &*that.symbol_;
631 }
632 bool NamedEntity::operator==(const NamedEntity &that) const {
633   if (IsSymbol()) {
634     return that.IsSymbol() &&
635         AreSameSymbol(GetFirstSymbol(), that.GetFirstSymbol());
636   } else {
637     return !that.IsSymbol() && GetComponent() == that.GetComponent();
638   }
639 }
640 bool TypeParamInquiry::operator==(const TypeParamInquiry &that) const {
641   return &*parameter_ == &*that.parameter_ && base_ == that.base_;
642 }
643 bool Triplet::operator==(const Triplet &that) const {
644   return lower_ == that.lower_ && upper_ == that.upper_ &&
645       stride_ == that.stride_;
646 }
647 bool Subscript::operator==(const Subscript &that) const { return u == that.u; }
648 bool ArrayRef::operator==(const ArrayRef &that) const {
649   return base_ == that.base_ && subscript_ == that.subscript_;
650 }
651 bool CoarrayRef::operator==(const CoarrayRef &that) const {
652   return base_ == that.base_ && subscript_ == that.subscript_ &&
653       cosubscript_ == that.cosubscript_ && stat_ == that.stat_ &&
654       team_ == that.team_ && teamIsTeamNumber_ == that.teamIsTeamNumber_;
655 }
656 bool DataRef::operator==(const DataRef &that) const {
657   return TestVariableEquality(*this, that);
658 }
659 bool Substring::operator==(const Substring &that) const {
660   return parent_ == that.parent_ && lower_ == that.lower_ &&
661       upper_ == that.upper_;
662 }
663 bool ComplexPart::operator==(const ComplexPart &that) const {
664   return part_ == that.part_ && complex_ == that.complex_;
665 }
666 bool ProcedureRef::operator==(const ProcedureRef &that) const {
667   return proc_ == that.proc_ && arguments_ == that.arguments_;
668 }
669 template <typename T>
670 bool Designator<T>::operator==(const Designator<T> &that) const {
671   return TestVariableEquality(*this, that);
672 }
673 bool DescriptorInquiry::operator==(const DescriptorInquiry &that) const {
674   return field_ == that.field_ && base_ == that.base_ &&
675       dimension_ == that.dimension_;
676 }
677 
678 INSTANTIATE_VARIABLE_TEMPLATES
679 } // namespace Fortran::evaluate
680 
681 template class Fortran::common::Indirection<Fortran::evaluate::Component, true>;
682