source: src/AST/Expr.hpp@ 152c2b2

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 152c2b2 was 665f432, checked in by Thierry Delisle <tdelisle@…>, 6 years ago

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