source: src/AST/Expr.hpp@ 93744b5

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 93744b5 was d908563, checked in by Thierry Delisle <tdelisle@…>, 6 years ago

Merge branch 'master' into cleanup-dtors
  • Property mode set to 100644
File size: 24.2 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 : Aaron B. Moss
12// Created On : Fri May 10 10:30:00 2019
13// Update Count : 1
14//
15
16#pragma once
17
18#include <cassert>
19#include <map>
20#include <string>
21#include <utility> // for move
22#include <vector>
23
24#include "Fwd.hpp" // for UniqueId
25#include "Label.hpp"
26#include "ParseNode.hpp"
27#include "Visitor.hpp"
28
29// Must be included in *all* AST classes; should be #undef'd at the end of the file
30#define MUTATE_FRIEND template<typename node_t> friend node_t * mutate(const node_t * node);
31
32class ConverterOldToNew;
33
34namespace ast {
35
36/// Contains the ID of a declaration and a type that is derived from that declaration,
37/// but subject to decay-to-pointer and type parameter renaming
38struct ParamEntry {
39 UniqueId decl;
40 ptr<Type> actualType;
41 ptr<Type> formalType;
42 ptr<Expr> expr;
43
44 ParamEntry() : decl( 0 ), actualType( nullptr ), formalType( nullptr ), expr( nullptr ) {}
45 ParamEntry( UniqueId id, Type* actual, Type* formal, Expr* e )
46 : decl( id ), actualType( actual ), formalType( formal ), expr( e ) {}
47};
48
49/// Pre-resolution list of parameters to infer
50using ResnSlots = std::vector<UniqueId>;
51/// Post-resolution map of inferred parameters
52using InferredParams = std::map< UniqueId, ParamEntry >;
53
54/// Base node for expressions
55class Expr : public ParseNode {
56public:
57 /// Saves space (~16 bytes) by combining ResnSlots and InferredParams
58 struct InferUnion {
59 enum { Empty, Slots, Params } mode;
60 union data_t {
61 char def;
62 ResnSlots resnSlots;
63 InferredParams inferParams;
64
65 data_t() : def('\0') {}
66 ~data_t() {}
67 } data;
68
69 /// initializes from other InferUnion
70 void init_from( const InferUnion& o ) {
71 switch ( o.mode ) {
72 case Empty: return;
73 case Slots: new(&data.resnSlots) ResnSlots{ o.data.resnSlots }; return;
74 case Params: new(&data.inferParams) InferredParams{ o.data.inferParams }; return;
75 }
76 }
77
78 /// initializes from other InferUnion (move semantics)
79 void init_from( InferUnion&& o ) {
80 switch ( o.mode ) {
81 case Empty: return;
82 case Slots: new(&data.resnSlots) ResnSlots{ std::move(o.data.resnSlots) }; return;
83 case Params:
84 new(&data.inferParams) InferredParams{ std::move(o.data.inferParams) }; return;
85 }
86 }
87
88 /// clears variant fields
89 void reset() {
90 switch( mode ) {
91 case Empty: return;
92 case Slots: data.resnSlots.~ResnSlots(); return;
93 case Params: data.inferParams.~InferredParams(); return;
94 }
95 }
96
97 InferUnion() : mode(Empty), data() {}
98 InferUnion( const InferUnion& o ) : mode( o.mode ), data() { init_from( o ); }
99 InferUnion( InferUnion&& o ) : mode( o.mode ), data() { init_from( std::move(o) ); }
100 InferUnion& operator= ( const InferUnion& ) = delete;
101 InferUnion& operator= ( InferUnion&& ) = delete;
102 ~InferUnion() { reset(); }
103
104 ResnSlots& resnSlots() {
105 switch (mode) {
106 case Empty: new(&data.resnSlots) ResnSlots{}; mode = Slots; // fallthrough
107 case Slots: return data.resnSlots;
108 case Params: assert(!"Cannot return to resnSlots from Params");
109 }
110 return *((ResnSlots*)nullptr);
111 }
112
113 const ResnSlots& resnSlotsConst() const {
114 if (mode == Slots) {
115 return data.resnSlots;
116 }
117 assert(!"Mode was not already resnSlots");
118 return *((ResnSlots*)nullptr);
119 }
120
121 InferredParams& inferParams() {
122 switch (mode) {
123 case Slots: data.resnSlots.~ResnSlots(); // fallthrough
124 case Empty: new(&data.inferParams) InferredParams{}; mode = Params; // fallthrough
125 case Params: return data.inferParams;
126 }
127 return *((InferredParams*)nullptr);
128 }
129
130 const InferredParams& inferParamsConst() const {
131 if (mode == Params) {
132 return data.inferParams;
133 }
134 assert(!"Mode was not already Params");
135 return *((InferredParams*)nullptr);
136 }
137 };
138
139 ptr<Type> result;
140 ptr<TypeSubstitution> env;
141 InferUnion inferred;
142 bool extension = false;
143
144 Expr( const CodeLocation & loc, const Type * res = nullptr )
145 : ParseNode( loc ), result( res ), env(), inferred() {}
146
147 Expr * set_extension( bool ex ) { extension = ex; return this; }
148
149 virtual const Expr * accept( Visitor & v ) const override = 0;
150private:
151 Expr * clone() const override = 0;
152 MUTATE_FRIEND
153};
154
155/// The application of a function to a set of parameters.
156/// Post-resolver form of `UntypedExpr`
157class ApplicationExpr final : public Expr {
158public:
159 ptr<Expr> func;
160 std::vector<ptr<Expr>> args;
161
162 ApplicationExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} );
163
164 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
165private:
166 ApplicationExpr * clone() const override { return new ApplicationExpr{ *this }; }
167 MUTATE_FRIEND
168};
169
170/// The application of a function to a set of parameters, pre-overload resolution.
171class UntypedExpr final : public Expr {
172public:
173 ptr<Expr> func;
174 std::vector<ptr<Expr>> args;
175
176 UntypedExpr( const CodeLocation & loc, const Expr * f, std::vector<ptr<Expr>> && as = {} )
177 : Expr( loc ), func( f ), args( std::move(as) ) {}
178
179 /// Creates a new dereference expression
180 static UntypedExpr * createDeref( const CodeLocation & loc, Expr * arg );
181 /// Creates a new assignment expression
182 static UntypedExpr * createAssign( const CodeLocation & loc, Expr * lhs, Expr * rhs );
183
184 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
185private:
186 UntypedExpr * clone() const override { return new UntypedExpr{ *this }; }
187 MUTATE_FRIEND
188};
189
190/// A name whose name is as-yet undetermined.
191/// May also be used to avoid name mangling in codegen phase.
192class NameExpr final : public Expr {
193public:
194 std::string name;
195
196 NameExpr( const CodeLocation & loc, const std::string & n ) : Expr( loc ), name( n ) {}
197
198 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
199private:
200 NameExpr * clone() const override { return new NameExpr{ *this }; }
201 MUTATE_FRIEND
202};
203
204/// Address-of expression `&e`
205class AddressExpr final : public Expr {
206public:
207 ptr<Expr> arg;
208
209 AddressExpr( const CodeLocation & loc, const Expr * a );
210
211 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
212private:
213 AddressExpr * clone() const override { return new AddressExpr{ *this }; }
214 MUTATE_FRIEND
215};
216
217/// GCC &&label
218/// https://gcc.gnu.org/onlinedocs/gcc-3.4.2/gcc/Labels-as-Values.html
219class LabelAddressExpr final : public Expr {
220public:
221 Label arg;
222
223 LabelAddressExpr( const CodeLocation & loc, Label && a );
224
225 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
226private:
227 LabelAddressExpr * clone() const override { return new LabelAddressExpr{ *this }; }
228 MUTATE_FRIEND
229};
230
231/// Whether a cast existed in the program source or not
232enum GeneratedFlag { ExplicitCast, GeneratedCast };
233
234/// A type cast, e.g. `(int)e`
235class CastExpr final : public Expr {
236public:
237 ptr<Expr> arg;
238 GeneratedFlag isGenerated;
239
240 CastExpr( const CodeLocation & loc, const Expr * a, const Type * to,
241 GeneratedFlag g = GeneratedCast ) : Expr( loc, to ), arg( a ), isGenerated( g ) {}
242 /// Cast-to-void
243 CastExpr( const CodeLocation & loc, const Expr * a, GeneratedFlag g = GeneratedCast );
244
245 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
246private:
247 CastExpr * clone() const override { return new CastExpr{ *this }; }
248 MUTATE_FRIEND
249};
250
251/// A cast to "keyword types", e.g. `(thread &)t`
252class KeywordCastExpr final : public Expr {
253public:
254 ptr<Expr> arg;
255 enum Target { Coroutine, Thread, Monitor, NUMBER_OF_TARGETS } target;
256
257 KeywordCastExpr( const CodeLocation & loc, const Expr * a, Target t )
258 : Expr( loc ), arg( a ), target( t ) {}
259
260 /// Get a name for the target type
261 const std::string& targetString() const;
262
263 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
264private:
265 KeywordCastExpr * clone() const override { return new KeywordCastExpr{ *this }; }
266 MUTATE_FRIEND
267};
268
269/// A virtual dynamic cast, e.g. `(virtual exception)e`
270class VirtualCastExpr final : public Expr {
271public:
272 ptr<Expr> arg;
273
274 VirtualCastExpr( const CodeLocation & loc, const Expr * a, const Type * to )
275 : Expr( loc, to ), arg( a ) {}
276
277 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
278private:
279 VirtualCastExpr * clone() const override { return new VirtualCastExpr{ *this }; }
280 MUTATE_FRIEND
281};
282
283/// A member selection operation before expression resolution, e.g. `q.p`
284class UntypedMemberExpr final : public Expr {
285public:
286 ptr<Expr> member;
287 ptr<Expr> aggregate;
288
289 UntypedMemberExpr( const CodeLocation & loc, const Expr * mem, const Expr * agg )
290 : Expr( loc ), member( mem ), aggregate( agg ) { assert( aggregate ); }
291
292 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
293private:
294 UntypedMemberExpr * clone() const override { return new UntypedMemberExpr{ *this }; }
295 MUTATE_FRIEND
296};
297
298/// A member selection operation after expression resolution, e.g. `q.p`
299class MemberExpr final : public Expr {
300public:
301 readonly<DeclWithType> member;
302 ptr<Expr> aggregate;
303
304 MemberExpr( const CodeLocation & loc, const DeclWithType * mem, const Expr * agg );
305
306 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
307private:
308 MemberExpr * clone() const override { return new MemberExpr{ *this }; }
309 MUTATE_FRIEND
310};
311
312/// A reference to a named variable.
313class VariableExpr final : public Expr {
314public:
315 readonly<DeclWithType> var;
316
317 VariableExpr( const CodeLocation & loc, const DeclWithType * v );
318
319 /// generates a function pointer for a given function
320 static VariableExpr * functionPointer( const CodeLocation & loc, const FunctionDecl * decl );
321
322 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
323private:
324 VariableExpr * clone() const override { return new VariableExpr{ *this }; }
325 MUTATE_FRIEND
326};
327
328/// A compile-time constant
329class ConstantExpr final : public Expr {
330 union Val {
331 unsigned long long ival;
332 double dval;
333
334 Val( unsigned long long i ) : ival( i ) {}
335 Val( double d ) : dval( d ) {}
336 } val;
337public:
338 std::string rep;
339 enum Kind { Integer, FloatingPoint, String } kind;
340
341 ConstantExpr(
342 const CodeLocation & loc, const Type * ty, const std::string & r, unsigned long long v,
343 Kind k = Integer )
344 : Expr( loc, ty ), val( v ), rep( r ), kind( k ) {}
345 ConstantExpr( const CodeLocation & loc, const Type * ty, const std::string & r, double v )
346 : Expr( loc, ty ), val( v ), rep( r ), kind( FloatingPoint ) {}
347
348 /// Gets the value of this constant as an integer
349 long long int intValue() const;
350 /// Gets the value of this constant as floating point
351 double floatValue() const;
352
353 /// generates a boolean constant of the given bool
354 static ConstantExpr * from_bool( const CodeLocation & loc, bool b );
355 /// generates a char constant of the given char
356 static ConstantExpr * from_char( const CodeLocation & loc, char c );
357 /// generates an integer constant of the given int
358 static ConstantExpr * from_int( const CodeLocation & loc, int i );
359 /// generates an integer constant of the given unsigned long int
360 static ConstantExpr * from_ulong( const CodeLocation & loc, unsigned long i );
361 /// generates a floating point constant of the given double
362 static ConstantExpr * from_double( const CodeLocation & loc, double d );
363 /// generates an array of chars constant of the given string
364 static ConstantExpr * from_string( const CodeLocation & loc, const std::string & s );
365 /// generates a null pointer value for the given type. void * if omitted.
366 static ConstantExpr * null( const CodeLocation & loc, const Type * ptrType = nullptr );
367
368 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
369private:
370 ConstantExpr * clone() const override { return new ConstantExpr{ *this }; }
371 MUTATE_FRIEND
372};
373
374/// sizeof expression, e.g. `sizeof(int)`, `sizeof 3+4`
375class SizeofExpr final : public Expr {
376public:
377 ptr<Expr> expr;
378 ptr<Type> type;
379
380 SizeofExpr( const CodeLocation & loc, const Expr * e );
381 SizeofExpr( const CodeLocation & loc, const Type * t );
382 // deliberately no disambiguating overload for nullptr_t
383
384 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
385private:
386 SizeofExpr * clone() const override { return new SizeofExpr{ *this }; }
387 MUTATE_FRIEND
388};
389
390/// alignof expression, e.g. `alignof(int)`, `alignof 3+4`
391class AlignofExpr final : public Expr {
392public:
393 ptr<Expr> expr;
394 ptr<Type> type;
395
396 AlignofExpr( const CodeLocation & loc, const Expr * e );
397 AlignofExpr( const CodeLocation & loc, const Type * t );
398 // deliberately no disambiguating overload for nullptr_t
399
400 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
401private:
402 AlignofExpr * clone() const override { return new AlignofExpr{ *this }; }
403 MUTATE_FRIEND
404};
405
406/// offsetof expression before resolver determines field, e.g. `offsetof(MyStruct, myfield)`
407class UntypedOffsetofExpr final : public Expr {
408public:
409 ptr<Type> type;
410 std::string member;
411
412 UntypedOffsetofExpr( const CodeLocation & loc, const Type * ty, const std::string & mem )
413 : Expr( loc ), type( ty ), member( mem ) {}
414
415 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
416private:
417 UntypedOffsetofExpr * clone() const override { return new UntypedOffsetofExpr{ *this }; }
418 MUTATE_FRIEND
419};
420
421/// offsetof expression after resolver determines field, e.g. `offsetof(MyStruct, myfield)`
422class OffsetofExpr final : public Expr {
423public:
424 ptr<Type> type;
425 readonly<DeclWithType> member;
426
427 OffsetofExpr( const CodeLocation & loc, const Type * ty, const DeclWithType * mem );
428
429 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
430private:
431 OffsetofExpr * clone() const override { return new OffsetofExpr{ *this }; }
432 MUTATE_FRIEND
433};
434
435/// a pack of field-offsets for a generic type
436class OffsetPackExpr final : public Expr {
437public:
438 ptr<StructInstType> type;
439
440 OffsetPackExpr( const CodeLocation & loc, const StructInstType * ty );
441
442 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
443private:
444 OffsetPackExpr * clone() const override { return new OffsetPackExpr{ *this }; }
445 MUTATE_FRIEND
446};
447
448/// Variants of short-circuiting logical expression
449enum LogicalFlag { OrExpr, AndExpr };
450
451/// Short-circuiting boolean expression (`&&` or `||`)
452class LogicalExpr final : public Expr {
453public:
454 ptr<Expr> arg1;
455 ptr<Expr> arg2;
456 LogicalFlag isAnd;
457
458 LogicalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, LogicalFlag ia );
459
460 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
461private:
462 LogicalExpr * clone() const override { return new LogicalExpr{ *this }; }
463 MUTATE_FRIEND
464};
465
466/// Three-argument conditional e.g. `p ? a : b`
467class ConditionalExpr final : public Expr {
468public:
469 ptr<Expr> arg1;
470 ptr<Expr> arg2;
471 ptr<Expr> arg3;
472
473 ConditionalExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2, const Expr * a3 )
474 : Expr( loc ), arg1( a1 ), arg2( a2 ), arg3( a3 ) {}
475
476 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
477private:
478 ConditionalExpr * clone() const override { return new ConditionalExpr{ *this }; }
479 MUTATE_FRIEND
480};
481
482/// Comma expression e.g. `( a , b )`
483class CommaExpr final : public Expr {
484public:
485 ptr<Expr> arg1;
486 ptr<Expr> arg2;
487
488 CommaExpr( const CodeLocation & loc, const Expr * a1, const Expr * a2 )
489 : Expr( loc ), arg1( a1 ), arg2( a2 ) {}
490
491 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
492private:
493 CommaExpr * clone() const override { return new CommaExpr{ *this }; }
494 MUTATE_FRIEND
495};
496
497/// A type used as an expression (e.g. a type generator parameter)
498class TypeExpr final : public Expr {
499public:
500 ptr<Type> type;
501
502 TypeExpr( const CodeLocation & loc, const Type * t ) : Expr(loc), type(t) {}
503
504 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
505private:
506 TypeExpr * clone() const override { return new TypeExpr{ *this }; }
507 MUTATE_FRIEND
508};
509
510/// A GCC "asm constraint operand" used in an asm statement, e.g. `[output] "=f" (result)`.
511/// https://gcc.gnu.org/onlinedocs/gcc-4.7.1/gcc/Machine-Constraints.html#Machine-Constraints
512class AsmExpr final : public Expr {
513public:
514 ptr<Expr> inout;
515 ptr<Expr> constraint;
516 ptr<Expr> operand;
517
518 AsmExpr( const CodeLocation & loc, const Expr * io, const Expr * con, const Expr * op )
519 : Expr( loc ), inout( io ), constraint( con ), operand( op ) {}
520
521 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
522private:
523 AsmExpr * clone() const override { return new AsmExpr{ *this }; }
524 MUTATE_FRIEND
525};
526
527/// The application of a function to a set of parameters, along with a set of copy constructor
528/// calls, one for each argument
529class ImplicitCopyCtorExpr final : public Expr {
530public:
531 ptr<ApplicationExpr> callExpr;
532
533 ImplicitCopyCtorExpr( const CodeLocation& loc, const ApplicationExpr * call )
534 : Expr( loc, call->result ) { assert( call ); }
535
536 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
537private:
538 ImplicitCopyCtorExpr * clone() const override { return new ImplicitCopyCtorExpr{ *this }; }
539 MUTATE_FRIEND
540};
541
542/// Constructor in expression context, e.g. `int * x = alloc() { 42 };`
543class ConstructorExpr final : public Expr {
544public:
545 ptr<Expr> callExpr;
546
547 ConstructorExpr( const CodeLocation & loc, const Expr * call );
548
549 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
550private:
551 ConstructorExpr * clone() const override { return new ConstructorExpr{ *this }; }
552 MUTATE_FRIEND
553};
554
555/// A C99 compound literal, e.g. `(MyType){ a, b, c }`
556class CompoundLiteralExpr final : public Expr {
557public:
558 ptr<Init> init;
559
560 CompoundLiteralExpr( const CodeLocation & loc, const Type * t, const Init * i );
561
562 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
563private:
564 CompoundLiteralExpr * clone() const override { return new CompoundLiteralExpr{ *this }; }
565 MUTATE_FRIEND
566};
567
568/// A range, e.g. `3 ... 5` or `1~10`
569class RangeExpr final : public Expr {
570public:
571 ptr<Expr> low;
572 ptr<Expr> high;
573
574 RangeExpr( const CodeLocation & loc, const Expr * l, const Expr * h )
575 : Expr( loc ), low( l ), high( h ) {}
576
577 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
578private:
579 RangeExpr * clone() const override { return new RangeExpr{ *this }; }
580 MUTATE_FRIEND
581};
582
583/// A tuple expression before resolution, e.g. `[a, b, c]`
584class UntypedTupleExpr final : public Expr {
585public:
586 std::vector<ptr<Expr>> exprs;
587
588 UntypedTupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs )
589 : Expr( loc ), exprs( std::move(xs) ) {}
590
591 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
592private:
593 UntypedTupleExpr * clone() const override { return new UntypedTupleExpr{ *this }; }
594 MUTATE_FRIEND
595};
596
597/// A tuple expression after resolution, e.g. `[a, b, c]`
598class TupleExpr final : public Expr {
599public:
600 std::vector<ptr<Expr>> exprs;
601
602 TupleExpr( const CodeLocation & loc, std::vector<ptr<Expr>> && xs );
603
604 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
605private:
606 TupleExpr * clone() const override { return new TupleExpr{ *this }; }
607 MUTATE_FRIEND
608};
609
610/// An element selection operation on a tuple value, e.g. `t.3` after analysis
611class TupleIndexExpr final : public Expr {
612public:
613 ptr<Expr> tuple;
614 unsigned index;
615
616 TupleIndexExpr( const CodeLocation & loc, const Expr * t, unsigned i );
617
618 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
619private:
620 TupleIndexExpr * clone() const override { return new TupleIndexExpr{ *this }; }
621 MUTATE_FRIEND
622};
623
624/// A multiple- or mass-assignment operation, or a tuple ctor/dtor expression.
625/// multiple-assignment: both sides of the assignment have tuple type,
626/// e.g. `[a, b, c] = [d, e, f];`
627/// mass-assignment: left-hand side has tuple type and right-hand side does not:
628/// e.g. `[a, b, c] = 42;`
629class TupleAssignExpr final : public Expr {
630public:
631 ptr<StmtExpr> stmtExpr;
632
633 TupleAssignExpr(
634 const CodeLocation & loc, std::vector<ptr<Expr>> && assigns,
635 std::vector<ptr<ObjectDecl>> && tempDecls );
636
637 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
638
639 friend class ::ConverterOldToNew;
640
641private:
642 TupleAssignExpr * clone() const override { return new TupleAssignExpr{ *this }; }
643 TupleAssignExpr( const CodeLocation & loc, const Type * result, const StmtExpr * s );
644
645 MUTATE_FRIEND
646};
647
648/// A GCC "statement expression", e.g. `({ int x = 5; x })`
649class StmtExpr final : public Expr {
650public:
651 ptr<CompoundStmt> stmts;
652 std::vector<ptr<ObjectDecl>> returnDecls; ///< return variable(s) for statement expression
653 std::vector<ptr<Expr>> dtors; ///< destructor(s) for return variable(s)
654
655 StmtExpr( const CodeLocation & loc, const CompoundStmt * ss );
656
657 /// Set the result type of this StmtExpr based on its body
658 void computeResult();
659
660 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
661private:
662 StmtExpr * clone() const override { return new StmtExpr{ *this }; }
663 MUTATE_FRIEND
664};
665
666/// An expression which must only be evaluated once
667class UniqueExpr final : public Expr {
668 static unsigned long long nextId;
669public:
670 ptr<Expr> expr;
671 ptr<ObjectDecl> object;
672 ptr<VariableExpr> var;
673 unsigned long long id;
674
675 UniqueExpr( const CodeLocation & loc, const Expr * e, unsigned long long i = -1 );
676
677 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
678private:
679 UniqueExpr * clone() const override { return new UniqueExpr{ *this }; }
680 MUTATE_FRIEND
681};
682
683/// One option for resolving an initializer expression
684struct InitAlternative {
685 ptr<Type> type;
686 ptr<Designation> designation;
687
688 InitAlternative() = default;
689 InitAlternative( const Type * ty, const Designation * des ) : type( ty ), designation( des ) {}
690};
691
692/// Pre-resolution initializer expression
693class UntypedInitExpr final : public Expr {
694public:
695 ptr<Expr> expr;
696 std::vector<InitAlternative> initAlts;
697
698 UntypedInitExpr( const CodeLocation & loc, const Expr * e, std::vector<InitAlternative> && as )
699 : Expr( loc ), expr( e ), initAlts( std::move(as) ) {}
700
701 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
702private:
703 UntypedInitExpr * clone() const override { return new UntypedInitExpr{ *this }; }
704 MUTATE_FRIEND
705};
706
707/// Post-resolution initializer expression
708class InitExpr final : public Expr {
709public:
710 ptr<Expr> expr;
711 ptr<Designation> designation;
712
713 InitExpr( const CodeLocation & loc, const Expr * e, const Designation * des )
714 : Expr( loc, e->result ), expr( e ), designation( des ) {}
715
716 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
717private:
718 InitExpr * clone() const override { return new InitExpr{ *this }; }
719 MUTATE_FRIEND
720};
721
722/// Expression containing a deleted identifier.
723/// Internal to resolver.
724class DeletedExpr final : public Expr {
725public:
726 ptr<Expr> expr;
727 readonly<Node> deleteStmt;
728
729 DeletedExpr( const CodeLocation & loc, const Expr * e, const Node * del )
730 : Expr( loc, e->result ), expr( e ), deleteStmt( del ) { assert( expr->result ); }
731
732 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
733private:
734 DeletedExpr * clone() const override { return new DeletedExpr{ *this }; }
735 MUTATE_FRIEND
736};
737
738/// Use of a default argument.
739/// Internal to resolver.
740class DefaultArgExpr final : public Expr {
741public:
742 ptr<Expr> expr;
743
744 DefaultArgExpr( const CodeLocation & loc, const Expr * e )
745 : Expr( loc, e->result ), expr( e ) { assert( e->result ); }
746
747 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
748private:
749 DefaultArgExpr * clone() const override { return new DefaultArgExpr{ *this }; }
750 MUTATE_FRIEND
751};
752
753/// C11 _Generic expression
754class GenericExpr final : public Expr {
755public:
756 /// One arm of the _Generic expr
757 struct Association {
758 ptr<Type> type;
759 ptr<Expr> expr;
760
761 Association() = default;
762 // default case
763 Association( const Expr * e ) : type(), expr( e ) {}
764 // non-default case
765 Association( const Type * t, const Expr * e ) : type( t ), expr( e ) {}
766 };
767
768 ptr<Expr> control;
769 std::vector<Association> associations;
770
771 GenericExpr( const CodeLocation & loc, const Expr * ctrl, std::vector<Association> && assns )
772 : Expr( loc ), control( ctrl ), associations( std::move(assns) ) {}
773
774 const Expr * accept( Visitor & v ) const override { return v.visit( this ); }
775private:
776 GenericExpr * clone() const override { return new GenericExpr{ *this }; }
777 MUTATE_FRIEND
778};
779
780
781}
782
783#undef MUTATE_FRIEND
784
785// Local Variables: //
786// tab-width: 4 //
787// mode: c++ //
788// compile-command: "make install" //
789// End: //
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