source: src/AST/Expr.hpp@ df40a56

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since df40a56 was 312029a, checked in by Peter A. Buhr <pabuhr@…>, 6 years ago

move enum Aggregate from DeclarationNode to AggregateDecl, add control-keyword field-dereference to replace control-keyword cast
  • Property mode set to 100644
File size: 25.9 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// Expr.hpp --
8//
9// Author : Aaron B. Moss
10// Created On : Fri May 10 10:30:00 2019
11// Last Modified By : Peter A. Buhr
12// Created On : Fri May 10 10:30:00 2019
13// Update Count : 7
14//
15
16#pragma once
17
18#include <cassert>
19#include <deque>
20#include <map>
21#include <string>
22#include <utility> // for move
23#include <vector>
24#include <optional>
25
26#include "Fwd.hpp" // for UniqueId
27#include "Label.hpp"
28#include "Decl.hpp"
29#include "ParseNode.hpp"
30#include "Visitor.hpp"
31
32// Must be included in *all* AST classes; should be #undef'd at the end of the file
33#define MUTATE_FRIEND template<typename node_t> friend node_t * mutate(const node_t * node);
34
35class ConverterOldToNew;
36class ConverterNewToOld;
37
38namespace ast {
39
40/// Contains the ID of a declaration and a type that is derived from that declaration,
41/// but subject to decay-to-pointer and type parameter renaming
42struct ParamEntry {
43 UniqueId decl;
44 ptr<Decl> declptr;
45 ptr<Type> actualType;
46 ptr<Type> formalType;
47 ptr<Expr> expr;
48
49 ParamEntry() : decl( 0 ), declptr( nullptr ), actualType( nullptr ), formalType( nullptr ), expr( nullptr ) {}
50 ParamEntry(
51 UniqueId id, const Decl * declptr, const Type * actual, const Type * formal,
52 const Expr * e )
53 : decl( id ), declptr( declptr ), actualType( actual ), formalType( formal ), expr( e ) {}
54};
55
56/// Pre-resolution list of parameters to infer
57using ResnSlots = std::vector<UniqueId>;
58/// Post-resolution map of inferred parameters
59using InferredParams = std::map< UniqueId, ParamEntry >;
60
61/// Base node for expressions
62class Expr : public ParseNode {
63public:
64 /// Saves space (~16 bytes) by combining ResnSlots and InferredParams
65 struct InferUnion {
66 enum { Empty, Slots, Params } mode;
67 union data_t {
68 char def;
69 ResnSlots resnSlots;
70 InferredParams inferParams;
71
72 data_t() : def('\0') {}
73 ~data_t() {}
74 } data;
75
76 /// initializes from other InferUnion
77 void init_from( const InferUnion& o ) {
78 switch ( o.mode ) {
79 case Empty: return;
80 case Slots: new(&data.resnSlots) ResnSlots{ o.data.resnSlots }; return;
81 case Params: new(&data.inferParams) InferredParams{ o.data.inferParams }; return;
82 }
83 }
84
85 /// initializes from other InferUnion (move semantics)
86 void init_from( InferUnion&& o ) {
87 switch ( o.mode ) {
88 case Empty: return;
89 case Slots: new(&data.resnSlots) ResnSlots{ std::move(o.data.resnSlots) }; return;
90 case Params:
91 new(&data.inferParams) InferredParams{ std::move(o.data.inferParams) }; return;
92 }
93 }
94
95 /// clears variant fields
96 void reset() {
97 switch( mode ) {
98 case Empty: return;
99 case Slots: data.resnSlots.~ResnSlots(); return;
100 case Params: data.inferParams.~InferredParams(); return;
101 }
102 }
103
104 InferUnion() : mode(Empty), data() {}
105 InferUnion( const InferUnion& o ) : mode( o.mode ), data() { init_from( o ); }
106 InferUnion( InferUnion&& o ) : mode( o.mode ), data() { init_from( std::move(o) ); }
107 InferUnion& operator= ( const InferUnion& ) = delete;
108 InferUnion& operator= ( InferUnion&& ) = delete;
109 ~InferUnion() { reset(); }
110
111 ResnSlots& resnSlots() {
112 switch (mode) {
113 case Empty: new(&data.resnSlots) ResnSlots{}; mode = Slots; // fallthrough
114 case Slots: return data.resnSlots;
115 case Params: assertf(false, "Cannot return to resnSlots from Params"); abort();
116 }
117 assertf(false, "unreachable");
118 }
119
120 const ResnSlots& resnSlots() const {
121 if (mode == Slots) {
122 return data.resnSlots;
123 }
124 assertf(false, "Mode was not already resnSlots");
125 abort();
126 }
127
128 InferredParams& inferParams() {
129 switch (mode) {
130 case Slots: data.resnSlots.~ResnSlots(); // fallthrough
131 case Empty: new(&data.inferParams) InferredParams{}; mode = Params; // fallthrough
132 case Params: return data.inferParams;
133 }
134 assertf(false, "unreachable");
135 }
136
137 const InferredParams& inferParams() const {
138 if (mode == Params) {
139 return data.inferParams;
140 }
141 assertf(false, "Mode was not already Params");
142 abort();
143 }
144
145 void set_inferParams( InferredParams && ps ) {
146 switch(mode) {
147 case Slots:
148 data.resnSlots.~ResnSlots();
149 // fallthrough
150 case Empty:
151 new(&data.inferParams) InferredParams{ std::move( ps ) };
152 mode = Params;
153 break;
154 case Params:
155 data.inferParams = std::move( ps );
156 break;
157 }
158 }
159
160 /// splices other InferUnion into this one. Will fail if one union is in `Slots` mode
161 /// and the other is in `Params`.
162 void splice( InferUnion && o ) {
163 if ( o.mode == Empty ) return;
164 if ( mode == Empty ) { init_from( o ); return; }
165 assert( mode == o.mode && "attempt to splice incompatible InferUnion" );
166
167 if ( mode == Slots ){
168 data.resnSlots.insert(
169 data.resnSlots.end(), o.data.resnSlots.begin(), o.data.resnSlots.end() );
170 } else if ( mode == Params ) {
171 for ( const auto & p : o.data.inferParams ) {
172 data.inferParams[p.first] = std::move(p.second);
173 }
174 } else assertf(false, "invalid mode");
175 }
176 };
177
178 ptr<Type> result;
179 ptr<TypeSubstitution> env;
180 InferUnion inferred;
181 bool extension = false;
182
183 Expr( const CodeLocation & loc, const Type * res = nullptr )
184 : ParseNode( loc ), result( res ), env(), inferred() {}
185
186 Expr * set_extension( bool ex ) { extension = ex; return this; }
187
188 virtual const Expr * accept( Visitor & v ) const override = 0;
189private:
190 Expr * clone() const override = 0;
191 MUTATE_FRIEND
192};
193
194/// The application of a function to a set of parameters.
195/// Post-resolver form of `UntypedExpr`
196class ApplicationExpr final : public Expr {
197public:
198 ptr<Expr> func;
199 std::vector<ptr<Expr>> args;
200
201 ApplicationExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} );
202
203 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
204private:
205 ApplicationExpr * clone() const override { return new ApplicationExpr{ *this }; }
206 MUTATE_FRIEND
207};
208
209/// The application of a function to a set of parameters, pre-overload resolution.
210class UntypedExpr final : public Expr {
211public:
212 ptr<Expr> func;
213 std::vector<ptr<Expr>> args;
214
215 UntypedExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} )
216 : Expr( loc ), func( f ), args( std::move(as) ) {}
217
218 /// Creates a new dereference expression
219 static UntypedExpr * createDeref( const CodeLocation & loc, Expr * arg );
220 /// Creates a new assignment expression
221 static UntypedExpr * createAssign( const CodeLocation & loc, Expr * lhs, Expr * rhs );
222
223 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
224private:
225 UntypedExpr * clone() const override { return new UntypedExpr{ *this }; }
226 MUTATE_FRIEND
227};
228
229/// A name whose name is as-yet undetermined.
230/// May also be used to avoid name mangling in codegen phase.
231class NameExpr final : public Expr {
232public:
233 std::string name;
234
235 NameExpr( const CodeLocation & loc, const std::string & n ) : Expr( loc ), name( n ) {}
236
237 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
238private:
239 NameExpr * clone() const override { return new NameExpr{ *this }; }
240 MUTATE_FRIEND
241};
242
243/// Address-of expression `&e`
244class AddressExpr final : public Expr {
245public:
246 ptr<Expr> arg;
247
248 AddressExpr( const CodeLocation & loc, const Expr * a );
249
250 /// Generate AddressExpr wrapping given expression at same location
251 AddressExpr( const Expr * a ) : AddressExpr( a->location, a ) {}
252
253 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
254private:
255 AddressExpr * clone() const override { return new AddressExpr{ *this }; }
256 MUTATE_FRIEND
257};
258
259/// GCC &&label
260/// https://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/Labels-as-Values.html
261class LabelAddressExpr final : public Expr {
262public:
263 Label arg;
264
265 LabelAddressExpr( const CodeLocation & loc, Label && a );
266
267 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
268private:
269 LabelAddressExpr * clone() const override { return new LabelAddressExpr{ *this }; }
270 MUTATE_FRIEND
271};
272
273/// Whether a cast existed in the program source or not
274enum GeneratedFlag { ExplicitCast, GeneratedCast };
275
276/// A type cast, e.g. `(int)e`
277class CastExpr final : public Expr {
278public:
279 ptr<Expr> arg;
280 GeneratedFlag isGenerated;
281
282 CastExpr( const CodeLocation & loc, const Expr * a, const Type * to,
283 GeneratedFlag g = GeneratedCast ) : Expr( loc, to ), arg( a ), isGenerated( g ) {}
284 /// Cast-to-void
285 CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g = GeneratedCast );
286
287 /// Wrap a cast expression around an existing expression (always generated)
288 CastExpr( const Expr * a, const Type * to ) : CastExpr( a->location, a, to, GeneratedCast ) {}
289
290 /// Wrap a cast-to-void expression around an existing expression (always generated)
291 CastExpr( const Expr * a ) : CastExpr( a->location, a, GeneratedCast ) {}
292
293 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
294private:
295 CastExpr * clone() const override { return new CastExpr{ *this }; }
296 MUTATE_FRIEND
297};
298
299/// A cast to "keyword types", e.g. `(thread &)t`
300class KeywordCastExpr final : public Expr {
301public:
302 ptr<Expr> arg;
303 ast::AggregateDecl::Aggregate target;
304
305 KeywordCastExpr( const CodeLocation & loc, const Expr * a, ast::AggregateDecl::Aggregate t )
306 : Expr( loc ), arg( a ), target( t ) {}
307
308 /// Get a name for the target type
309 const char * targetString() const;
310
311 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
312private:
313 KeywordCastExpr * clone() const override { return new KeywordCastExpr{ *this }; }
314 MUTATE_FRIEND
315};
316
317/// A virtual dynamic cast, e.g. `(virtual exception)e`
318class VirtualCastExpr final : public Expr {
319public:
320 ptr<Expr> arg;
321
322 VirtualCastExpr( const CodeLocation & loc, const Expr * a, const Type * to )
323 : Expr( loc, to ), arg( a ) {}
324
325 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
326private:
327 VirtualCastExpr * clone() const override { return new VirtualCastExpr{ *this }; }
328 MUTATE_FRIEND
329};
330
331/// A member selection operation before expression resolution, e.g. `q.p`
332class UntypedMemberExpr final : public Expr {
333public:
334 ptr<Expr> member;
335 ptr<Expr> aggregate;
336
337 UntypedMemberExpr( const CodeLocation & loc, const Expr * mem, const Expr * agg )
338 : Expr( loc ), member( mem ), aggregate( agg ) { assert( aggregate ); }
339
340 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
341private:
342 UntypedMemberExpr * clone() const override { return new UntypedMemberExpr{ *this }; }
343 MUTATE_FRIEND
344};
345
346/// A member selection operation after expression resolution, e.g. `q.p`
347class MemberExpr final : public Expr {
348public:
349 readonly<DeclWithType> member;
350 ptr<Expr> aggregate;
351
352 MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg );
353
354 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
355private:
356 MemberExpr * clone() const override { return new MemberExpr{ *this }; }
357 MUTATE_FRIEND
358};
359
360/// A reference to a named variable.
361class VariableExpr final : public Expr {
362public:
363 readonly<DeclWithType> var;
364
365 VariableExpr( const CodeLocation & loc );
366 VariableExpr( const CodeLocation & loc, const DeclWithType * v );
367
368 /// generates a function pointer for a given function
369 static VariableExpr * functionPointer( const CodeLocation & loc, const FunctionDecl * decl );
370
371 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
372private:
373 VariableExpr * clone() const override { return new VariableExpr{ *this }; }
374 MUTATE_FRIEND
375};
376
377/// A compile-time constant.
378/// Mostly carries C-source text from parse to code-gen, without interpretation. E.g. strings keep their outer quotes and never have backslashes interpreted.
379/// Integer constants get special treatment, e.g. for verifying array operations, when an integer constant occurs as the length of an array.
380class ConstantExpr final : public Expr {
381public:
382 // Representation of this constant, as it occurs in .cfa source and .cfa.cc result.
383 std::string rep;
384
385 ConstantExpr(
386 const CodeLocation & loc, const Type * ty, const std::string & r,
387 std::optional<unsigned long long> i )
388 : Expr( loc, ty ), rep( r ), ival( i ) {}
389
390 /// Gets the integer value of this constant, if one is appropriate to its type.
391 /// Throws a SemanticError if the type is not appropriate for value-as-integer.
392 /// Suffers an assertion failure the type is appropriate but no integer value was supplied to the constructor.
393 long long int intValue() const;
394
395 /// generates a boolean constant of the given bool
396 static ConstantExpr * from_bool( const CodeLocation & loc, bool b );
397 /// generates an integer constant of the given int
398 static ConstantExpr * from_int( const CodeLocation & loc, int i );
399 /// generates an integer constant of the given unsigned long int
400 static ConstantExpr * from_ulong( const CodeLocation & loc, unsigned long i );
401 /// generates a null pointer value for the given type. void * if omitted.
402 static ConstantExpr * null( const CodeLocation & loc, const Type * ptrType = nullptr );
403
404 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
405private:
406 ConstantExpr * clone() const override { return new ConstantExpr{ *this }; }
407 MUTATE_FRIEND
408
409 std::optional<unsigned long long> ival;
410
411 // Intended only for legacy support of roundtripping the old AST.
412 // Captures the very-locally inferred type, before the resolver modifies the type of this ConstantExpression.
413 // In the old AST it's constExpr->constant.type
414 ptr<Type> underlyer;
415 friend class ::ConverterOldToNew;
416 friend class ::ConverterNewToOld;
417};
418
419/// sizeof expression, e.g. `sizeof(int)`, `sizeof 3+4`
420class SizeofExpr final : public Expr {
421public:
422 ptr<Expr> expr;
423 ptr<Type> type;
424
425 SizeofExpr( const CodeLocation & loc, const Expr * e );
426 SizeofExpr( const CodeLocation & loc, const Type * t );
427 // deliberately no disambiguating overload for nullptr_t
428
429 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
430private:
431 SizeofExpr * clone() const override { return new SizeofExpr{ *this }; }
432 MUTATE_FRIEND
433};
434
435/// alignof expression, e.g. `alignof(int)`, `alignof 3+4`
436class AlignofExpr final : public Expr {
437public:
438 ptr<Expr> expr;
439 ptr<Type> type;
440
441 AlignofExpr( const CodeLocation & loc, const Expr * e );
442 AlignofExpr( const CodeLocation & loc, const Type * t );
443 // deliberately no disambiguating overload for nullptr_t
444
445 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
446private:
447 AlignofExpr * clone() const override { return new AlignofExpr{ *this }; }
448 MUTATE_FRIEND
449};
450
451/// offsetof expression before resolver determines field, e.g. `offsetof(MyStruct, myfield)`
452class UntypedOffsetofExpr final : public Expr {
453public:
454 ptr<Type> type;
455 std::string member;
456
457 UntypedOffsetofExpr( const CodeLocation & loc, const Type * ty, const std::string & mem )
458 : Expr( loc ), type( ty ), member( mem ) {}
459
460 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
461private:
462 UntypedOffsetofExpr * clone() const override { return new UntypedOffsetofExpr{ *this }; }
463 MUTATE_FRIEND
464};
465
466/// offsetof expression after resolver determines field, e.g. `offsetof(MyStruct, myfield)`
467class OffsetofExpr final : public Expr {
468public:
469 ptr<Type> type;
470 readonly<DeclWithType> member;
471
472 OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem );
473
474 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
475private:
476 OffsetofExpr * clone() const override { return new OffsetofExpr{ *this }; }
477 MUTATE_FRIEND
478};
479
480/// a pack of field-offsets for a generic type
481class OffsetPackExpr final : public Expr {
482public:
483 ptr<StructInstType> type;
484
485 OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty );
486
487 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
488private:
489 OffsetPackExpr * clone() const override { return new OffsetPackExpr{ *this }; }
490 MUTATE_FRIEND
491};
492
493/// Variants of short-circuiting logical expression
494enum LogicalFlag { OrExpr, AndExpr };
495
496/// Short-circuiting boolean expression (`&&` or `||`)
497class LogicalExpr final : public Expr {
498public:
499 ptr<Expr> arg1;
500 ptr<Expr> arg2;
501 LogicalFlag isAnd;
502
503 LogicalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia );
504
505 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
506private:
507 LogicalExpr * clone() const override { return new LogicalExpr{ *this }; }
508 MUTATE_FRIEND
509};
510
511/// Three-argument conditional e.g. `p ? a : b`
512class ConditionalExpr final : public Expr {
513public:
514 ptr<Expr> arg1;
515 ptr<Expr> arg2;
516 ptr<Expr> arg3;
517
518 ConditionalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, const Expr * a3 )
519 : Expr( loc ), arg1( a1 ), arg2( a2 ), arg3( a3 ) {}
520
521 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
522private:
523 ConditionalExpr * clone() const override { return new ConditionalExpr{ *this }; }
524 MUTATE_FRIEND
525};
526
527/// Comma expression e.g. `( a , b )`
528class CommaExpr final : public Expr {
529public:
530 ptr<Expr> arg1;
531 ptr<Expr> arg2;
532
533 CommaExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2 )
534 : Expr( loc ), arg1( a1 ), arg2( a2 ) {}
535
536 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
537private:
538 CommaExpr * clone() const override { return new CommaExpr{ *this }; }
539 MUTATE_FRIEND
540};
541
542/// A type used as an expression (e.g. a type generator parameter)
543class TypeExpr final : public Expr {
544public:
545 ptr<Type> type;
546
547 TypeExpr( const CodeLocation & loc, const Type * t ) : Expr(loc), type(t) {}
548
549 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
550private:
551 TypeExpr * clone() const override { return new TypeExpr{ *this }; }
552 MUTATE_FRIEND
553};
554
555/// A GCC "asm constraint operand" used in an asm statement, e.g. `[output] "=f" (result)`.
556/// https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Machine-Constraints.html#Machine-Constraints
557class AsmExpr final : public Expr {
558public:
559 std::string inout;
560 ptr<Expr> constraint;
561 ptr<Expr> operand;
562
563 AsmExpr( const CodeLocation & loc, const std::string & io, const Expr * con, const Expr * op )
564 : Expr( loc ), inout( io ), constraint( con ), operand( op ) {}
565
566 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
567private:
568 AsmExpr * clone() const override { return new AsmExpr{ *this }; }
569 MUTATE_FRIEND
570};
571
572/// The application of a function to a set of parameters, along with a set of copy constructor
573/// calls, one for each argument
574class ImplicitCopyCtorExpr final : public Expr {
575public:
576 ptr<ApplicationExpr> callExpr;
577
578 ImplicitCopyCtorExpr( const CodeLocation& loc, const ApplicationExpr * call )
579 : Expr( loc, call->result ) { assert( call ); }
580
581 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
582private:
583 ImplicitCopyCtorExpr * clone() const override { return new ImplicitCopyCtorExpr{ *this }; }
584 MUTATE_FRIEND
585};
586
587/// Constructor in expression context, e.g. `int * x = alloc() { 42 };`
588class ConstructorExpr final : public Expr {
589public:
590 ptr<Expr> callExpr;
591
592 ConstructorExpr( const CodeLocation & loc, const Expr * call );
593
594 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
595private:
596 ConstructorExpr * clone() const override { return new ConstructorExpr{ *this }; }
597 MUTATE_FRIEND
598};
599
600/// A C99 compound literal, e.g. `(MyType){ a, b, c }`
601class CompoundLiteralExpr final : public Expr {
602public:
603 ptr<Init> init;
604
605 CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i );
606
607 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
608private:
609 CompoundLiteralExpr * clone() const override { return new CompoundLiteralExpr{ *this }; }
610 MUTATE_FRIEND
611};
612
613/// A range, e.g. `3 ... 5` or `1~10`
614class RangeExpr final : public Expr {
615public:
616 ptr<Expr> low;
617 ptr<Expr> high;
618
619 RangeExpr( const CodeLocation & loc, const Expr * l, const Expr * h )
620 : Expr( loc ), low( l ), high( h ) {}
621
622 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
623private:
624 RangeExpr * clone() const override { return new RangeExpr{ *this }; }
625 MUTATE_FRIEND
626};
627
628/// A tuple expression before resolution, e.g. `[a, b, c]`
629class UntypedTupleExpr final : public Expr {
630public:
631 std::vector<ptr<Expr>> exprs;
632
633 UntypedTupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs )
634 : Expr( loc ), exprs( std::move(xs) ) {}
635
636 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
637private:
638 UntypedTupleExpr * clone() const override { return new UntypedTupleExpr{ *this }; }
639 MUTATE_FRIEND
640};
641
642/// A tuple expression after resolution, e.g. `[a, b, c]`
643class TupleExpr final : public Expr {
644public:
645 std::vector<ptr<Expr>> exprs;
646
647 TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs );
648
649 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
650private:
651 TupleExpr * clone() const override { return new TupleExpr{ *this }; }
652 MUTATE_FRIEND
653};
654
655/// An element selection operation on a tuple value, e.g. `t.3` after analysis
656class TupleIndexExpr final : public Expr {
657public:
658 ptr<Expr> tuple;
659 unsigned index;
660
661 TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i );
662
663 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
664private:
665 TupleIndexExpr * clone() const override { return new TupleIndexExpr{ *this }; }
666 MUTATE_FRIEND
667};
668
669/// A multiple- or mass-assignment operation, or a tuple ctor/dtor expression.
670/// multiple-assignment: both sides of the assignment have tuple type,
671/// e.g. `[a, b, c] = [d, e, f];`
672/// mass-assignment: left-hand side has tuple type and right-hand side does not:
673/// e.g. `[a, b, c] = 42;`
674class TupleAssignExpr final : public Expr {
675public:
676 ptr<StmtExpr> stmtExpr;
677
678 TupleAssignExpr(
679 const CodeLocation & loc, std::vector<ptr<Expr>> && assigns,
680 std::vector<ptr<ObjectDecl>> && tempDecls );
681
682 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
683
684 friend class ::ConverterOldToNew;
685
686private:
687 TupleAssignExpr * clone() const override { return new TupleAssignExpr{ *this }; }
688 TupleAssignExpr( const CodeLocation & loc, const Type * result, const StmtExpr * s );
689
690 MUTATE_FRIEND
691};
692
693/// A GCC "statement expression", e.g. `({ int x = 5; x })`
694class StmtExpr final : public Expr {
695public:
696 ptr<CompoundStmt> stmts;
697 std::vector<ptr<ObjectDecl>> returnDecls; ///< return variable(s) for statement expression
698 std::vector<ptr<Expr>> dtors; ///< destructor(s) for return variable(s)
699
700 StmtExpr( const CodeLocation & loc, const CompoundStmt * ss );
701
702 /// Set the result type of this StmtExpr based on its body
703 void computeResult();
704
705 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
706private:
707 StmtExpr * clone() const override { return new StmtExpr{ *this }; }
708 MUTATE_FRIEND
709};
710
711/// An expression which must only be evaluated once
712class UniqueExpr final : public Expr {
713 static unsigned long long nextId;
714public:
715 ptr<Expr> expr;
716 ptr<ObjectDecl> object;
717 ptr<VariableExpr> var;
718 unsigned long long id;
719
720 UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i = -1ull );
721
722 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
723private:
724 UniqueExpr * clone() const override { return new UniqueExpr{ *this }; }
725 MUTATE_FRIEND
726};
727
728/// One option for resolving an initializer expression
729struct InitAlternative {
730 ptr<Type> type;
731 ptr<Designation> designation;
732
733 InitAlternative() = default;
734 InitAlternative( const Type * ty, const Designation * des ) : type( ty ), designation( des ) {}
735};
736
737/// Pre-resolution initializer expression
738class UntypedInitExpr final : public Expr {
739public:
740 ptr<Expr> expr;
741 std::deque<InitAlternative> initAlts;
742
743 UntypedInitExpr( const CodeLocation & loc, const Expr * e, std::deque<InitAlternative> && as )
744 : Expr( loc ), expr( e ), initAlts( std::move(as) ) {}
745
746 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
747private:
748 UntypedInitExpr * clone() const override { return new UntypedInitExpr{ *this }; }
749 MUTATE_FRIEND
750};
751
752/// Post-resolution initializer expression
753class InitExpr final : public Expr {
754public:
755 ptr<Expr> expr;
756 ptr<Designation> designation;
757
758 InitExpr( const CodeLocation & loc, const Expr * e, const Designation * des )
759 : Expr( loc, e->result ), expr( e ), designation( des ) {}
760
761 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
762private:
763 InitExpr * clone() const override { return new InitExpr{ *this }; }
764 MUTATE_FRIEND
765};
766
767/// Expression containing a deleted identifier.
768/// Internal to resolver.
769class DeletedExpr final : public Expr {
770public:
771 ptr<Expr> expr;
772 readonly<Decl> deleteStmt;
773
774 DeletedExpr( const CodeLocation & loc, const Expr * e, const Decl * del )
775 : Expr( loc, e->result ), expr( e ), deleteStmt( del ) { assert( expr->result ); }
776
777 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
778private:
779 DeletedExpr * clone() const override { return new DeletedExpr{ *this }; }
780 MUTATE_FRIEND
781};
782
783/// Use of a default argument.
784/// Internal to resolver.
785class DefaultArgExpr final : public Expr {
786public:
787 ptr<Expr> expr;
788
789 DefaultArgExpr( const CodeLocation & loc, const Expr * e )
790 : Expr( loc, e->result ), expr( e ) { assert( e->result ); }
791
792 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
793private:
794 DefaultArgExpr * clone() const override { return new DefaultArgExpr{ *this }; }
795 MUTATE_FRIEND
796};
797
798/// C11 _Generic expression
799class GenericExpr final : public Expr {
800public:
801 /// One arm of the _Generic expr
802 struct Association {
803 ptr<Type> type;
804 ptr<Expr> expr;
805
806 Association() = default;
807 // default case
808 Association( const Expr * e ) : type(), expr( e ) {}
809 // non-default case
810 Association( const Type * t, const Expr * e ) : type( t ), expr( e ) {}
811 };
812
813 ptr<Expr> control;
814 std::vector<Association> associations;
815
816 GenericExpr( const CodeLocation & loc, const Expr * ctrl, std::vector<Association> && assns )
817 : Expr( loc ), control( ctrl ), associations( std::move(assns) ) {}
818
819 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
820private:
821 GenericExpr * clone() const override { return new GenericExpr{ *this }; }
822 MUTATE_FRIEND
823};
824
825
826}
827
828#undef MUTATE_FRIEND
829
830// Local Variables: //
831// tab-width: 4 //
832// mode: c++ //
833// compile-command: "make install" //
834// End: //
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