source: src/Concurrency/Keywords.cpp@ 0497b6ba

Last change on this file since 0497b6ba was ed96731, checked in by Andrew Beach <ajbeach@…>, 10 months ago

With{Stmts,Decls}ToAdd how has an -X version like WithSymbolTableX. Although these -X versions might be useful can could possibly be removed in the future. (This is a therapy commit.)
  • Property mode set to 100644
File size: 48.7 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2016 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// Keywords.cpp -- Implement concurrency constructs from their keywords.
8//
9// Author : Andrew Beach
10// Created On : Tue Nov 16 9:53:00 2021
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Thu Dec 14 18:02:25 2023
13// Update Count : 6
14//
15
16#include "Concurrency/Keywords.hpp"
17
18#include <iostream>
19
20#include "AST/Copy.hpp"
21#include "AST/Decl.hpp"
22#include "AST/Expr.hpp"
23#include "AST/Inspect.hpp"
24#include "AST/Pass.hpp"
25#include "AST/Stmt.hpp"
26#include "AST/DeclReplacer.hpp"
27#include "AST/TranslationUnit.hpp"
28#include "CodeGen/OperatorTable.hpp"
29#include "Common/Examine.hpp"
30#include "Common/Utility.hpp"
31#include "Common/UniqueName.hpp"
32#include "ControlStruct/LabelGenerator.hpp"
33#include "InitTweak/InitTweak.hpp"
34#include "Virtual/Tables.hpp"
35
36namespace Concurrency {
37
38namespace {
39
40// --------------------------------------------------------------------------
41// Loose Helper Functions:
42
43/// Detect threads constructed with the keyword thread.
44bool isThread( const ast::DeclWithType * decl ) {
45 auto baseType = decl->get_type()->stripDeclarator();
46 auto instType = dynamic_cast<const ast::StructInstType *>( baseType );
47 if ( nullptr == instType ) { return false; }
48 return instType->base->is_thread();
49}
50
51/// Get the virtual type id if given a type name.
52std::string typeIdType( std::string const & exception_name ) {
53 return exception_name.empty() ? std::string()
54 : Virtual::typeIdType( exception_name );
55}
56
57/// Get the vtable type name if given a type name.
58std::string vtableTypeName( std::string const & exception_name ) {
59 return exception_name.empty() ? std::string()
60 : Virtual::vtableTypeName( exception_name );
61}
62
63static ast::Type * mutate_under_references( ast::ptr<ast::Type>& type ) {
64 ast::Type * mutType = type.get_and_mutate();
65 for ( ast::ReferenceType * mutRef
66 ; (mutRef = dynamic_cast<ast::ReferenceType *>( mutType ))
67 ; mutType = mutRef->base.get_and_mutate() );
68 return mutType;
69}
70
71// Describe that it adds the generic parameters and the uses of the generic
72// parameters on the function and first "this" argument.
73ast::FunctionDecl * fixupGenerics(
74 const ast::FunctionDecl * func, const ast::StructDecl * decl ) {
75 const CodeLocation & location = decl->location;
76 // We have to update both the declaration
77 auto mutFunc = ast::mutate( func );
78 auto mutType = mutFunc->type.get_and_mutate();
79
80 if ( decl->params.empty() ) {
81 return mutFunc;
82 }
83
84 assert( 0 != mutFunc->params.size() );
85 assert( 0 != mutType->params.size() );
86
87 // Add the "forall" clause information.
88 for ( const ast::ptr<ast::TypeDecl> & typeParam : decl->params ) {
89 auto typeDecl = ast::deepCopy( typeParam );
90 mutFunc->type_params.push_back( typeDecl );
91 mutType->forall.push_back( new ast::TypeInstType( typeDecl ) );
92 for ( auto & assertion : typeDecl->assertions ) {
93 mutFunc->assertions.push_back( assertion );
94 mutType->assertions.emplace_back(
95 new ast::VariableExpr( location, assertion ) );
96 }
97 typeDecl->assertions.clear();
98 }
99
100 // Even chain_mutate is not powerful enough for this:
101 ast::ptr<ast::Type>& paramType = strict_dynamic_cast<ast::ObjectDecl *>(
102 mutFunc->params[0].get_and_mutate() )->type;
103 auto paramTypeInst = strict_dynamic_cast<ast::StructInstType *>(
104 mutate_under_references( paramType ) );
105 auto typeParamInst = strict_dynamic_cast<ast::StructInstType *>(
106 mutate_under_references( mutType->params[0] ) );
107
108 for ( const ast::ptr<ast::TypeDecl> & typeDecl : mutFunc->type_params ) {
109 paramTypeInst->params.push_back(
110 new ast::TypeExpr( location, new ast::TypeInstType( typeDecl ) ) );
111 typeParamInst->params.push_back(
112 new ast::TypeExpr( location, new ast::TypeInstType( typeDecl ) ) );
113 }
114
115 return mutFunc;
116}
117
118// --------------------------------------------------------------------------
119struct ConcurrentSueKeyword : public ast::WithDeclsToAdd {
120 ConcurrentSueKeyword(
121 std::string&& type_name, std::string&& field_name,
122 std::string&& getter_name, std::string&& context_error,
123 std::string&& exception_name,
124 bool needs_main, ast::AggregateDecl::Aggregate cast_target
125 ) :
126 type_name( type_name ), field_name( field_name ),
127 getter_name( getter_name ), context_error( context_error ),
128 exception_name( exception_name ),
129 typeid_name( typeIdType( exception_name ) ),
130 vtable_name( vtableTypeName( exception_name ) ),
131 needs_main( needs_main ), cast_target( cast_target )
132 {}
133
134 virtual ~ConcurrentSueKeyword() {}
135
136 const ast::Decl * postvisit( const ast::StructDecl * decl );
137 const ast::DeclWithType * postvisit( const ast::FunctionDecl * decl );
138 const ast::Expr * postvisit( const ast::KeywordCastExpr * expr );
139
140 struct StructAndField {
141 const ast::StructDecl * decl;
142 const ast::ObjectDecl * field;
143 };
144
145 const ast::StructDecl * handleStruct( const ast::StructDecl * );
146 void handleMain( const ast::FunctionDecl *, const ast::StructInstType * );
147 void addTypeId( const ast::StructDecl * );
148 void addVtableForward( const ast::StructDecl * );
149 const ast::FunctionDecl * forwardDeclare( const ast::StructDecl * );
150 StructAndField addField( const ast::StructDecl * );
151 void addGetRoutines( const ast::ObjectDecl *, const ast::FunctionDecl * );
152 void addLockUnlockRoutines( const ast::StructDecl * );
153
154private:
155 const std::string type_name;
156 const std::string field_name;
157 const std::string getter_name;
158 const std::string context_error;
159 const std::string exception_name;
160 const std::string typeid_name;
161 const std::string vtable_name;
162 const bool needs_main;
163 const ast::AggregateDecl::Aggregate cast_target;
164
165 const ast::StructDecl * type_decl = nullptr;
166 const ast::FunctionDecl * dtor_decl = nullptr;
167 const ast::StructDecl * except_decl = nullptr;
168 const ast::StructDecl * typeid_decl = nullptr;
169 const ast::StructDecl * vtable_decl = nullptr;
170
171};
172
173// Handles thread type declarations:
174//
175// thread Mythread { struct MyThread {
176// int data; int data;
177// a_struct_t more_data; a_struct_t more_data;
178// => thread$ __thrd_d;
179// }; };
180// static inline thread$ * get_thread( MyThread * this ) { return &this->__thrd_d; }
181//
182struct ThreadKeyword final : public ConcurrentSueKeyword {
183 ThreadKeyword() : ConcurrentSueKeyword(
184 "thread$",
185 "__thrd",
186 "get_thread",
187 "thread keyword requires threads to be in scope, add #include <thread.hfa>\n",
188 "ThreadCancelled",
189 true,
190 ast::AggregateDecl::Thread )
191 {}
192
193 virtual ~ThreadKeyword() {}
194};
195
196// Handles coroutine type declarations:
197//
198// coroutine MyCoroutine { struct MyCoroutine {
199// int data; int data;
200// a_struct_t more_data; a_struct_t more_data;
201// => coroutine$ __cor_d;
202// }; };
203// static inline coroutine$ * get_coroutine( MyCoroutine * this ) { return &this->__cor_d; }
204//
205struct CoroutineKeyword final : public ConcurrentSueKeyword {
206 CoroutineKeyword() : ConcurrentSueKeyword(
207 "coroutine$",
208 "__cor",
209 "get_coroutine",
210 "coroutine keyword requires coroutines to be in scope, add #include <coroutine.hfa>\n",
211 "CoroutineCancelled",
212 true,
213 ast::AggregateDecl::Coroutine )
214 {}
215
216 virtual ~CoroutineKeyword() {}
217};
218
219// Handles monitor type declarations:
220//
221// monitor MyMonitor { struct MyMonitor {
222// int data; int data;
223// a_struct_t more_data; a_struct_t more_data;
224// => monitor$ __mon_d;
225// }; };
226// static inline monitor$ * get_coroutine( MyMonitor * this ) {
227// return &this->__cor_d;
228// }
229// void lock(MyMonitor & this) {
230// lock(get_monitor(this));
231// }
232// void unlock(MyMonitor & this) {
233// unlock(get_monitor(this));
234// }
235//
236struct MonitorKeyword final : public ConcurrentSueKeyword {
237 MonitorKeyword() : ConcurrentSueKeyword(
238 "monitor$",
239 "__mon",
240 "get_monitor",
241 "monitor keyword requires monitors to be in scope, add #include <monitor.hfa>\n",
242 "",
243 false,
244 ast::AggregateDecl::Monitor )
245 {}
246
247 virtual ~MonitorKeyword() {}
248};
249
250// Handles generator type declarations:
251//
252// generator MyGenerator { struct MyGenerator {
253// int data; int data;
254// a_struct_t more_data; a_struct_t more_data;
255// => int __generator_state;
256// }; };
257//
258struct GeneratorKeyword final : public ConcurrentSueKeyword {
259 GeneratorKeyword() : ConcurrentSueKeyword(
260 "generator$",
261 "__generator_state",
262 "get_generator",
263 "Unable to find builtin type generator$\n",
264 "",
265 true,
266 ast::AggregateDecl::Generator )
267 {}
268
269 virtual ~GeneratorKeyword() {}
270};
271
272const ast::Decl * ConcurrentSueKeyword::postvisit(
273 const ast::StructDecl * decl ) {
274 if ( !decl->body ) {
275 return decl;
276 } else if ( cast_target == decl->kind ) {
277 return handleStruct( decl );
278 } else if ( type_name == decl->name ) {
279 assert( !type_decl );
280 type_decl = decl;
281 } else if ( exception_name == decl->name ) {
282 assert( !except_decl );
283 except_decl = decl;
284 } else if ( typeid_name == decl->name ) {
285 assert( !typeid_decl );
286 typeid_decl = decl;
287 } else if ( vtable_name == decl->name ) {
288 assert( !vtable_decl );
289 vtable_decl = decl;
290 }
291 return decl;
292}
293
294// Try to get the full definition, but raise an error on conflicts.
295const ast::FunctionDecl * getDefinition(
296 const ast::FunctionDecl * old_decl,
297 const ast::FunctionDecl * new_decl ) {
298 if ( !new_decl->stmts ) {
299 return old_decl;
300 } else if ( !old_decl->stmts ) {
301 return new_decl;
302 } else {
303 assert( !old_decl->stmts || !new_decl->stmts );
304 return nullptr;
305 }
306}
307
308const ast::DeclWithType * ConcurrentSueKeyword::postvisit(
309 const ast::FunctionDecl * decl ) {
310 if ( type_decl && isDestructorFor( decl, type_decl ) ) {
311 // Check for forward declarations, try to get the full definition.
312 dtor_decl = (dtor_decl) ? getDefinition( dtor_decl, decl ) : decl;
313 } else if ( !vtable_name.empty() && decl->has_body() ) {
314 if (const ast::DeclWithType * param = isMainFor( decl, cast_target )) {
315 if ( !vtable_decl ) {
316 SemanticError( decl, context_error );
317 }
318 // Should be safe because of isMainFor.
319 const ast::StructInstType * struct_type =
320 static_cast<const ast::StructInstType *>(
321 static_cast<const ast::ReferenceType *>(
322 param->get_type() )->base.get() );
323
324 handleMain( decl, struct_type );
325 }
326 }
327 return decl;
328}
329
330const ast::Expr * ConcurrentSueKeyword::postvisit(
331 const ast::KeywordCastExpr * expr ) {
332 if ( cast_target == expr->target ) {
333 // Convert `(thread &)ex` to `(thread$ &)*get_thread(ex)`, etc.
334 if ( !type_decl || !dtor_decl ) {
335 SemanticError( expr, context_error );
336 }
337 assert( nullptr == expr->result );
338 auto cast = ast::mutate( expr );
339 cast->result = new ast::ReferenceType( new ast::StructInstType( type_decl ) );
340 cast->concrete_target.field = field_name;
341 cast->concrete_target.getter = getter_name;
342 return cast;
343 }
344 return expr;
345}
346
347const ast::StructDecl * ConcurrentSueKeyword::handleStruct(
348 const ast::StructDecl * decl ) {
349 assert( decl->body );
350
351 if ( !type_decl || !dtor_decl ) {
352 SemanticError( decl, context_error );
353 }
354
355 if ( !exception_name.empty() ) {
356 if( !typeid_decl || !vtable_decl ) {
357 SemanticError( decl, context_error );
358 }
359 addTypeId( decl );
360 addVtableForward( decl );
361 }
362
363 const ast::FunctionDecl * func = forwardDeclare( decl );
364 StructAndField addFieldRet = addField( decl );
365 decl = addFieldRet.decl;
366 const ast::ObjectDecl * field = addFieldRet.field;
367
368 addGetRoutines( field, func );
369 // Add routines to monitors for use by mutex stmt.
370 if ( ast::AggregateDecl::Monitor == cast_target ) {
371 addLockUnlockRoutines( decl );
372 }
373
374 return decl;
375}
376
377void ConcurrentSueKeyword::handleMain(
378 const ast::FunctionDecl * decl, const ast::StructInstType * type ) {
379 assert( vtable_decl );
380 assert( except_decl );
381
382 const CodeLocation & location = decl->location;
383
384 std::vector<ast::ptr<ast::Expr>> poly_args = {
385 new ast::TypeExpr( location, type ),
386 };
387 ast::ObjectDecl * vtable_object = Virtual::makeVtableInstance(
388 location,
389 "_default_vtable_object_declaration",
390 new ast::StructInstType( vtable_decl, copy( poly_args ) ),
391 type,
392 nullptr
393 );
394 declsToAddAfter.push_back( vtable_object );
395 declsToAddAfter.push_back(
396 new ast::ObjectDecl(
397 location,
398 Virtual::concurrentDefaultVTableName(),
399 new ast::ReferenceType( vtable_object->type, ast::CV::Const ),
400 new ast::SingleInit( location,
401 new ast::VariableExpr( location, vtable_object ) )
402 )
403 );
404 declsToAddAfter.push_back( Virtual::makeGetExceptionFunction(
405 location,
406 vtable_object,
407 new ast::StructInstType( except_decl, copy( poly_args ) )
408 ) );
409}
410
411void ConcurrentSueKeyword::addTypeId( const ast::StructDecl * decl ) {
412 assert( typeid_decl );
413 const CodeLocation & location = decl->location;
414
415 ast::StructInstType * typeid_type =
416 new ast::StructInstType( typeid_decl, ast::CV::Const );
417 typeid_type->params.push_back(
418 new ast::TypeExpr( location, new ast::StructInstType( decl ) ) );
419 declsToAddBefore.push_back(
420 Virtual::makeTypeIdInstance( location, typeid_type ) );
421 // If the typeid_type is going to be kept, the other reference will have
422 // been made by now, but we also get to avoid extra mutates.
423 ast::ptr<ast::StructInstType> typeid_cleanup = typeid_type;
424}
425
426void ConcurrentSueKeyword::addVtableForward( const ast::StructDecl * decl ) {
427 assert( vtable_decl );
428 const CodeLocation& location = decl->location;
429
430 std::vector<ast::ptr<ast::Expr>> poly_args = {
431 new ast::TypeExpr( location, new ast::StructInstType( decl ) ),
432 };
433 declsToAddBefore.push_back( Virtual::makeGetExceptionForward(
434 location,
435 new ast::StructInstType( vtable_decl, copy( poly_args ) ),
436 new ast::StructInstType( except_decl, copy( poly_args ) )
437 ) );
438 ast::ObjectDecl * vtable_object = Virtual::makeVtableForward(
439 location,
440 "_default_vtable_object_declaration",
441 new ast::StructInstType( vtable_decl, std::move( poly_args ) )
442 );
443 declsToAddBefore.push_back( vtable_object );
444 declsToAddBefore.push_back(
445 new ast::ObjectDecl(
446 location,
447 Virtual::concurrentDefaultVTableName(),
448 new ast::ReferenceType( vtable_object->type, ast::CV::Const ),
449 nullptr,
450 ast::Storage::Extern,
451 ast::Linkage::Cforall
452 )
453 );
454}
455
456const ast::FunctionDecl * ConcurrentSueKeyword::forwardDeclare(
457 const ast::StructDecl * decl ) {
458 const CodeLocation & location = decl->location;
459
460 ast::StructDecl * forward = ast::deepCopy( decl );
461 {
462 // If removing members makes ref-count go to zero, do not free.
463 ast::ptr<ast::StructDecl> forward_ptr = forward;
464 forward->body = false;
465 forward->members.clear();
466 forward_ptr.release();
467 }
468
469 ast::ObjectDecl * this_decl = new ast::ObjectDecl(
470 location,
471 "this",
472 new ast::ReferenceType( new ast::StructInstType( decl ) )
473 );
474
475 ast::ObjectDecl * ret_decl = new ast::ObjectDecl(
476 location,
477 "ret",
478 new ast::PointerType( new ast::StructInstType( type_decl ) )
479 );
480
481 ast::FunctionDecl * get_decl = new ast::FunctionDecl(
482 location,
483 getter_name,
484 { this_decl }, // params
485 { ret_decl }, // returns
486 nullptr, // stmts
487 ast::Storage::Static,
488 ast::Linkage::Cforall,
489 { new ast::Attribute( "const" ) },
490 ast::Function::Inline
491 );
492 get_decl = fixupGenerics( get_decl, decl );
493
494 ast::FunctionDecl * main_decl = nullptr;
495 if ( needs_main ) {
496 // `this_decl` is copied here because the original was used above.
497 main_decl = new ast::FunctionDecl(
498 location,
499 "main",
500 { ast::deepCopy( this_decl ) },
501 {},
502 nullptr,
503 ast::Storage::Classes(),
504 ast::Linkage::Cforall
505 );
506 main_decl = fixupGenerics( main_decl, decl );
507 }
508
509 declsToAddBefore.push_back( forward );
510 if ( needs_main ) declsToAddBefore.push_back( main_decl );
511 declsToAddBefore.push_back( get_decl );
512
513 return get_decl;
514}
515
516ConcurrentSueKeyword::StructAndField ConcurrentSueKeyword::addField(
517 const ast::StructDecl * decl ) {
518 const CodeLocation & location = decl->location;
519
520 ast::ObjectDecl * field = new ast::ObjectDecl(
521 location,
522 field_name,
523 new ast::StructInstType( type_decl )
524 );
525
526 auto mutDecl = ast::mutate( decl );
527 mutDecl->members.push_back( field );
528
529 return {mutDecl, field};
530}
531
532void ConcurrentSueKeyword::addGetRoutines(
533 const ast::ObjectDecl * field, const ast::FunctionDecl * forward ) {
534 // Clone the signature and then build the body.
535 ast::FunctionDecl * decl = ast::deepCopy( forward );
536
537 // Say it is generated at the "same" places as the forward declaration.
538 const CodeLocation & location = decl->location;
539
540 const ast::DeclWithType * param = decl->params.front();
541 ast::Stmt * stmt = new ast::ReturnStmt( location,
542 new ast::AddressExpr( location,
543 new ast::MemberExpr( location,
544 field,
545 new ast::CastExpr( location,
546 new ast::VariableExpr( location, param ),
547 ast::deepCopy( param->get_type()->stripReferences() ),
548 ast::ExplicitCast
549 )
550 )
551 )
552 );
553
554 decl->stmts = new ast::CompoundStmt( location, { stmt } );
555 declsToAddAfter.push_back( decl );
556}
557
558void ConcurrentSueKeyword::addLockUnlockRoutines(
559 const ast::StructDecl * decl ) {
560 // This should only be used on monitors.
561 assert( ast::AggregateDecl::Monitor == cast_target );
562
563 const CodeLocation & location = decl->location;
564
565 // The parameter for both routines.
566 ast::ObjectDecl * this_decl = new ast::ObjectDecl(
567 location,
568 "this",
569 new ast::ReferenceType( new ast::StructInstType( decl ) )
570 );
571
572 ast::FunctionDecl * lock_decl = new ast::FunctionDecl(
573 location,
574 "lock",
575 {
576 // Copy the declaration of this.
577 ast::deepCopy( this_decl ),
578 },
579 { /* returns */ },
580 nullptr,
581 ast::Storage::Static,
582 ast::Linkage::Cforall,
583 { /* attributes */ },
584 ast::Function::Inline
585 );
586 lock_decl = fixupGenerics( lock_decl, decl );
587
588 lock_decl->stmts = new ast::CompoundStmt( location, {
589 new ast::ExprStmt( location,
590 new ast::UntypedExpr( location,
591 new ast::NameExpr( location, "lock" ),
592 {
593 new ast::UntypedExpr( location,
594 new ast::NameExpr( location, "get_monitor" ),
595 { new ast::VariableExpr( location,
596 InitTweak::getParamThis( lock_decl ) ) }
597 )
598 }
599 )
600 )
601 } );
602
603 ast::FunctionDecl * unlock_decl = new ast::FunctionDecl(
604 location,
605 "unlock",
606 {
607 // Last use, consume the declaration of this.
608 this_decl,
609 },
610 { /* returns */ },
611 nullptr,
612 ast::Storage::Static,
613 ast::Linkage::Cforall,
614 { /* attributes */ },
615 ast::Function::Inline
616 );
617 unlock_decl = fixupGenerics( unlock_decl, decl );
618
619 unlock_decl->stmts = new ast::CompoundStmt( location, {
620 new ast::ExprStmt( location,
621 new ast::UntypedExpr( location,
622 new ast::NameExpr( location, "unlock" ),
623 {
624 new ast::UntypedExpr( location,
625 new ast::NameExpr( location, "get_monitor" ),
626 { new ast::VariableExpr( location,
627 InitTweak::getParamThis( unlock_decl ) ) }
628 )
629 }
630 )
631 )
632 } );
633
634 declsToAddAfter.push_back( lock_decl );
635 declsToAddAfter.push_back( unlock_decl );
636}
637
638
639// --------------------------------------------------------------------------
640struct SuspendKeyword final :
641 public ast::WithStmtsToAdd, public ast::WithGuards {
642 SuspendKeyword() = default;
643 virtual ~SuspendKeyword() = default;
644
645 void previsit( const ast::FunctionDecl * );
646 const ast::DeclWithType * postvisit( const ast::FunctionDecl * );
647 const ast::Stmt * postvisit( const ast::SuspendStmt * );
648
649private:
650 bool is_real_suspend( const ast::FunctionDecl * );
651
652 const ast::Stmt * make_generator_suspend( const ast::SuspendStmt * );
653 const ast::Stmt * make_coroutine_suspend( const ast::SuspendStmt * );
654
655 struct LabelPair {
656 ast::Label obj;
657 int idx;
658 };
659
660 LabelPair make_label(const ast::Stmt * stmt ) {
661 labels.push_back( ControlStruct::newLabel( "generator", stmt ) );
662 return { labels.back(), int(labels.size()) };
663 }
664
665 const ast::DeclWithType * in_generator = nullptr;
666 const ast::FunctionDecl * decl_suspend = nullptr;
667 std::vector<ast::Label> labels;
668};
669
670void SuspendKeyword::previsit( const ast::FunctionDecl * decl ) {
671 GuardValue( in_generator ); in_generator = nullptr;
672
673 // If it is the real suspend, grab it if we don't have one already.
674 if ( is_real_suspend( decl ) ) {
675 decl_suspend = decl_suspend ? decl_suspend : decl;
676 return;
677 }
678
679 // Otherwise check if this is a generator main and, if so, handle it.
680 auto param = isMainFor( decl, ast::AggregateDecl::Generator );
681 if ( !param ) return;
682
683 if ( 0 != decl->returns.size() ) {
684 SemanticError( decl->location, "Generator main must return void." );
685 }
686
687 in_generator = param;
688 GuardValue( labels ); labels.clear();
689}
690
691const ast::DeclWithType * SuspendKeyword::postvisit(
692 const ast::FunctionDecl * decl ) {
693 // Only modify a full definition of a generator with states.
694 if ( !decl->stmts || !in_generator || labels.empty() ) return decl;
695
696 const CodeLocation & location = decl->location;
697
698 // Create a new function body:
699 // static void * __generator_labels[] = {&&s0, &&s1, ...};
700 // void * __generator_label = __generator_labels[GEN.__generator_state];
701 // goto * __generator_label;
702 // s0: ;
703 // OLD_BODY
704
705 // This is the null statement inserted right before the body.
706 ast::NullStmt * noop = new ast::NullStmt( location );
707 noop->labels.push_back( ControlStruct::newLabel( "generator", noop ) );
708 const ast::Label & first_label = noop->labels.back();
709
710 // Add each label to the init, starting with the first label.
711 std::vector<ast::ptr<ast::Init>> inits = {
712 new ast::SingleInit( location,
713 new ast::LabelAddressExpr( location, copy( first_label ) ) ) };
714 // Then go through all the stored labels, and clear the store.
715 for ( auto && label : labels ) {
716 inits.push_back( new ast::SingleInit( label.location,
717 new ast::LabelAddressExpr( label.location, std::move( label )
718 ) ) );
719 }
720 labels.clear();
721 // Then construct the initializer itself.
722 auto init = new ast::ListInit( location, std::move( inits ) );
723
724 ast::ObjectDecl * generatorLabels = new ast::ObjectDecl(
725 location,
726 "__generator_labels",
727 new ast::ArrayType(
728 new ast::PointerType( new ast::VoidType() ),
729 nullptr,
730 ast::FixedLen,
731 ast::DynamicDim
732 ),
733 init,
734 ast::Storage::Classes(),
735 ast::Linkage::AutoGen
736 );
737
738 ast::ObjectDecl * generatorLabel = new ast::ObjectDecl(
739 location,
740 "__generator_label",
741 new ast::PointerType( new ast::VoidType() ),
742 new ast::SingleInit( location,
743 new ast::UntypedExpr( location,
744 new ast::NameExpr( location, "?[?]" ),
745 {
746 // TODO: Could be a variable expr.
747 new ast::NameExpr( location, "__generator_labels" ),
748 new ast::UntypedMemberExpr( location,
749 new ast::NameExpr( location, "__generator_state" ),
750 new ast::VariableExpr( location, in_generator )
751 )
752 }
753 )
754 ),
755 ast::Storage::Classes(),
756 ast::Linkage::AutoGen
757 );
758
759 ast::BranchStmt * theGoTo = new ast::BranchStmt(
760 location, new ast::VariableExpr( location, generatorLabel )
761 );
762
763 // The noop goes here in order.
764
765 ast::CompoundStmt * body = new ast::CompoundStmt( location, {
766 { new ast::DeclStmt( location, generatorLabels ) },
767 { new ast::DeclStmt( location, generatorLabel ) },
768 { theGoTo },
769 { noop },
770 { decl->stmts },
771 } );
772
773 auto mutDecl = ast::mutate( decl );
774 mutDecl->stmts = body;
775 return mutDecl;
776}
777
778const ast::Stmt * SuspendKeyword::postvisit( const ast::SuspendStmt * stmt ) {
779 switch ( stmt->kind ) {
780 case ast::SuspendStmt::None:
781 // Use the context to determain the implicit target.
782 if ( in_generator ) {
783 return make_generator_suspend( stmt );
784 } else {
785 return make_coroutine_suspend( stmt );
786 }
787 case ast::SuspendStmt::Coroutine:
788 return make_coroutine_suspend( stmt );
789 case ast::SuspendStmt::Generator:
790 // Generator suspends must be directly in a generator.
791 if ( !in_generator ) SemanticError( stmt->location, "\"suspend generator\" must be used inside main of generator type." );
792 return make_generator_suspend( stmt );
793 }
794 assert( false );
795 return stmt;
796}
797
798/// Find the real/official suspend declaration.
799bool SuspendKeyword::is_real_suspend( const ast::FunctionDecl * decl ) {
800 return ( !decl->linkage.is_mangled
801 && 0 == decl->params.size()
802 && 0 == decl->returns.size()
803 && "__cfactx_suspend" == decl->name );
804}
805
806const ast::Stmt * SuspendKeyword::make_generator_suspend(
807 const ast::SuspendStmt * stmt ) {
808 assert( in_generator );
809 // Target code is:
810 // GEN.__generator_state = X;
811 // THEN
812 // return;
813 // __gen_X:;
814
815 const CodeLocation & location = stmt->location;
816
817 LabelPair label = make_label( stmt );
818
819 // This is the context saving statement.
820 stmtsToAddBefore.push_back( new ast::ExprStmt( location,
821 new ast::UntypedExpr( location,
822 new ast::NameExpr( location, "?=?" ),
823 {
824 new ast::UntypedMemberExpr( location,
825 new ast::NameExpr( location, "__generator_state" ),
826 new ast::VariableExpr( location, in_generator )
827 ),
828 ast::ConstantExpr::from_int( location, label.idx ),
829 }
830 )
831 ) );
832
833 // The THEN component is conditional (return is not).
834 if ( stmt->then ) {
835 stmtsToAddBefore.push_back( stmt->then.get() );
836 }
837 stmtsToAddBefore.push_back( new ast::ReturnStmt( location, nullptr ) );
838
839 // The null statement replaces the old suspend statement.
840 return new ast::NullStmt( location, { label.obj } );
841}
842
843const ast::Stmt * SuspendKeyword::make_coroutine_suspend(
844 const ast::SuspendStmt * stmt ) {
845 // The only thing we need from the old statement is the location.
846 const CodeLocation & location = stmt->location;
847
848 if ( !decl_suspend ) {
849 SemanticError( location, "suspend keyword applied to coroutines requires coroutines to be in scope, add #include <coroutine.hfa>." );
850 }
851 if ( stmt->then ) {
852 SemanticError( location, "Compound statement following coroutines is not implemented." );
853 }
854
855 return new ast::ExprStmt( location,
856 new ast::UntypedExpr( location,
857 ast::VariableExpr::functionPointer( location, decl_suspend ) )
858 );
859}
860
861// --------------------------------------------------------------------------
862struct MutexKeyword final : public ast::WithDeclsToAdd {
863 const ast::FunctionDecl * postvisit( const ast::FunctionDecl * decl );
864 void postvisit( const ast::StructDecl * decl );
865 const ast::Stmt * postvisit( const ast::MutexStmt * stmt );
866
867 static std::vector<const ast::DeclWithType *> findMutexArgs(
868 const ast::FunctionDecl * decl, bool & first );
869 static void validate( const ast::DeclWithType * decl );
870
871 ast::CompoundStmt * addDtorStatements( const ast::FunctionDecl* func, const ast::CompoundStmt *, const std::vector<const ast::DeclWithType *> &);
872 ast::CompoundStmt * addStatements( const ast::FunctionDecl* func, const ast::CompoundStmt *, const std::vector<const ast::DeclWithType *> &);
873 ast::CompoundStmt * addStatements( const ast::CompoundStmt * body, const std::vector<ast::ptr<ast::Expr>> & args );
874 ast::CompoundStmt * addThreadDtorStatements( const ast::FunctionDecl* func, const ast::CompoundStmt * body, const std::vector<const ast::DeclWithType *> & args );
875 ast::ExprStmt * genVirtLockUnlockExpr( const std::string & fnName, ast::ptr<ast::Expr> expr, const CodeLocation & location, ast::Expr * param);
876 ast::IfStmt * genTypeDiscrimLockUnlock( const std::string & fnName, const std::vector<ast::ptr<ast::Expr>> & args, const CodeLocation & location, ast::UntypedExpr * thisParam );
877private:
878 const ast::StructDecl * monitor_decl = nullptr;
879 const ast::StructDecl * guard_decl = nullptr;
880 const ast::StructDecl * dtor_guard_decl = nullptr;
881 const ast::StructDecl * thread_guard_decl = nullptr;
882 const ast::StructDecl * lock_guard_decl = nullptr;
883
884 static ast::ptr<ast::Type> generic_func;
885
886 UniqueName mutex_func_namer = UniqueName("__lock_unlock_curr");
887};
888
889const ast::FunctionDecl * MutexKeyword::postvisit(
890 const ast::FunctionDecl * decl ) {
891 bool is_first_argument_mutex = false;
892 const std::vector<const ast::DeclWithType *> mutexArgs =
893 findMutexArgs( decl, is_first_argument_mutex );
894 bool const isDtor = CodeGen::isDestructor( decl->name );
895
896 // Does this function have any mutex arguments that connect to monitors?
897 if ( mutexArgs.empty() ) {
898 // If this is the destructor for a monitor it must be mutex.
899 if ( isDtor ) {
900 // This reflects MutexKeyword::validate, but no error messages.
901 const ast::Type * type = decl->type->params.front();
902
903 // If it's a copy, it's not a mutex.
904 const ast::ReferenceType * refType = dynamic_cast<const ast::ReferenceType *>( type );
905 if ( nullptr == refType ) {
906 return decl;
907 }
908
909 // If it is not pointing directly to a type, it's not a mutex.
910 auto base = refType->base;
911 if ( base.as<ast::ReferenceType>() ) return decl;
912 if ( base.as<ast::PointerType>() ) return decl;
913
914 // If it is not a struct, it's not a mutex.
915 auto baseStruct = base.as<ast::StructInstType>();
916 if ( nullptr == baseStruct ) return decl;
917
918 // If it is a monitor, then it is a monitor.
919 if( baseStruct->base->is_monitor() || baseStruct->base->is_thread() ) {
920 SemanticError( decl, "destructors for structures declared as \"monitor\" must use mutex parameters " );
921 }
922 }
923 return decl;
924 }
925
926 // Monitors can't be constructed with mutual exclusion.
927 if ( CodeGen::isConstructor( decl->name ) && is_first_argument_mutex ) {
928 SemanticError( decl, "constructors cannot have mutex parameters " );
929 }
930
931 // It makes no sense to have multiple mutex parameters for the destructor.
932 if ( isDtor && mutexArgs.size() != 1 ) {
933 SemanticError( decl, "destructors can only have 1 mutex argument " );
934 }
935
936 // Make sure all the mutex arguments are monitors.
937 for ( auto arg : mutexArgs ) {
938 validate( arg );
939 }
940
941 // Check to see if the body needs to be instrument the body.
942 const ast::CompoundStmt * body = decl->stmts;
943 if ( !body ) return decl;
944
945 // Check to if the required headers have been seen.
946 if ( !monitor_decl || !guard_decl || !dtor_guard_decl ) {
947 SemanticError( decl, "mutex keyword requires monitors to be in scope, add #include <monitor.hfa>." );
948 }
949
950 // Instrument the body.
951 ast::CompoundStmt * newBody = nullptr;
952 if ( isDtor && isThread( mutexArgs.front() ) ) {
953 if ( !thread_guard_decl ) {
954 SemanticError( decl, "thread destructor requires threads to be in scope, add #include <thread.hfa>." );
955 }
956 newBody = addThreadDtorStatements( decl, body, mutexArgs );
957 } else if ( isDtor ) {
958 newBody = addDtorStatements( decl, body, mutexArgs );
959 } else {
960 newBody = addStatements( decl, body, mutexArgs );
961 }
962 assert( newBody );
963 return ast::mutate_field( decl, &ast::FunctionDecl::stmts, newBody );
964}
965
966void MutexKeyword::postvisit( const ast::StructDecl * decl ) {
967 if ( !decl->body ) {
968 return;
969 } else if ( decl->name == "monitor$" ) {
970 assert( !monitor_decl );
971 monitor_decl = decl;
972 } else if ( decl->name == "monitor_guard_t" ) {
973 assert( !guard_decl );
974 guard_decl = decl;
975 } else if ( decl->name == "monitor_dtor_guard_t" ) {
976 assert( !dtor_guard_decl );
977 dtor_guard_decl = decl;
978 } else if ( decl->name == "thread_dtor_guard_t" ) {
979 assert( !thread_guard_decl );
980 thread_guard_decl = decl;
981 } else if ( decl->name == "__mutex_stmt_lock_guard" ) {
982 assert( !lock_guard_decl );
983 lock_guard_decl = decl;
984 }
985}
986
987const ast::Stmt * MutexKeyword::postvisit( const ast::MutexStmt * stmt ) {
988 if ( !lock_guard_decl ) {
989 SemanticError( stmt->location, "mutex stmt requires a header, add #include <mutex_stmt.hfa>." );
990 }
991 ast::CompoundStmt * body =
992 new ast::CompoundStmt( stmt->location, { stmt->stmt } );
993
994 return addStatements( body, stmt->mutexObjs );;
995}
996
997std::vector<const ast::DeclWithType *> MutexKeyword::findMutexArgs(
998 const ast::FunctionDecl * decl, bool & first ) {
999 std::vector<const ast::DeclWithType *> mutexArgs;
1000
1001 bool once = true;
1002 for ( auto arg : decl->params ) {
1003 const ast::Type * type = arg->get_type();
1004 if ( type->is_mutex() ) {
1005 if ( once ) first = true;
1006 mutexArgs.push_back( arg.get() );
1007 }
1008 once = false;
1009 }
1010 return mutexArgs;
1011}
1012
1013void MutexKeyword::validate( const ast::DeclWithType * decl ) {
1014 const ast::Type * type = decl->get_type();
1015
1016 // If it's a copy, it's not a mutex.
1017 const ast::ReferenceType * refType = dynamic_cast<const ast::ReferenceType *>( type );
1018 if ( nullptr == refType ) {
1019 SemanticError( decl, "Mutex argument must be of reference type " );
1020 }
1021
1022 // If it is not pointing directly to a type, it's not a mutex.
1023 auto base = refType->base;
1024 if ( base.as<ast::ReferenceType>() || base.as<ast::PointerType>() ) {
1025 SemanticError( decl, "Mutex argument have exactly one level of indirection " );
1026 }
1027
1028 // If it is not a struct, it's not a mutex.
1029 auto baseStruct = base.as<ast::StructInstType>();
1030 if ( nullptr == baseStruct ) return;
1031
1032 // Make sure that only the outer reference is mutex.
1033 if( baseStruct->is_mutex() ) {
1034 SemanticError( decl, "mutex keyword may only appear once per argument " );
1035 }
1036}
1037
1038ast::CompoundStmt * MutexKeyword::addDtorStatements(
1039 const ast::FunctionDecl* func, const ast::CompoundStmt * body,
1040 const std::vector<const ast::DeclWithType *> & args ) {
1041 ast::Type * argType = ast::shallowCopy( args.front()->get_type() );
1042 argType->set_mutex( false );
1043
1044 ast::CompoundStmt * mutBody = ast::mutate( body );
1045
1046 // Generated code goes near the beginning of body:
1047 const CodeLocation & location = mutBody->location;
1048
1049 const ast::ObjectDecl * monitor = new ast::ObjectDecl(
1050 location,
1051 "__monitor",
1052 new ast::PointerType( new ast::StructInstType( monitor_decl ) ),
1053 new ast::SingleInit(
1054 location,
1055 new ast::UntypedExpr(
1056 location,
1057 new ast::NameExpr( location, "get_monitor" ),
1058 { new ast::CastExpr(
1059 location,
1060 new ast::VariableExpr( location, args.front() ),
1061 argType, ast::ExplicitCast
1062 ) }
1063 )
1064 )
1065 );
1066
1067 assert( generic_func );
1068
1069 // In reverse order:
1070 // monitor_dtor_guard_t __guard = { __monitor, func, false };
1071 mutBody->push_front(
1072 new ast::DeclStmt( location, new ast::ObjectDecl(
1073 location,
1074 "__guard",
1075 new ast::StructInstType( dtor_guard_decl ),
1076 new ast::ListInit(
1077 location,
1078 {
1079 new ast::SingleInit( location,
1080 new ast::AddressExpr( location,
1081 new ast::VariableExpr( location, monitor ) ) ),
1082 new ast::SingleInit( location,
1083 new ast::CastExpr( location,
1084 new ast::VariableExpr( location, func ),
1085 generic_func,
1086 ast::ExplicitCast ) ),
1087 new ast::SingleInit( location,
1088 ast::ConstantExpr::from_bool( location, false ) ),
1089 },
1090 {},
1091 ast::MaybeConstruct
1092 )
1093 ))
1094 );
1095
1096 // monitor$ * __monitor = get_monitor(a);
1097 mutBody->push_front( new ast::DeclStmt( location, monitor ) );
1098
1099 return mutBody;
1100}
1101
1102ast::CompoundStmt * MutexKeyword::addStatements(
1103 const ast::FunctionDecl* func, const ast::CompoundStmt * body,
1104 const std::vector<const ast::DeclWithType * > & args ) {
1105 ast::CompoundStmt * mutBody = ast::mutate( body );
1106
1107 // Code is generated near the beginning of the compound statement.
1108 const CodeLocation & location = mutBody->location;
1109
1110 // Make pointer to the monitors.
1111 ast::ObjectDecl * monitors = new ast::ObjectDecl(
1112 location,
1113 "__monitors",
1114 new ast::ArrayType(
1115 new ast::PointerType(
1116 new ast::StructInstType( monitor_decl )
1117 ),
1118 ast::ConstantExpr::from_ulong( location, args.size() ),
1119 ast::FixedLen,
1120 ast::DynamicDim
1121 ),
1122 new ast::ListInit(
1123 location,
1124 map_range<std::vector<ast::ptr<ast::Init>>>(
1125 args,
1126 []( const ast::DeclWithType * decl ) {
1127 return new ast::SingleInit(
1128 decl->location,
1129 new ast::UntypedExpr(
1130 decl->location,
1131 new ast::NameExpr( decl->location, "get_monitor" ),
1132 {
1133 new ast::CastExpr(
1134 decl->location,
1135 new ast::VariableExpr( decl->location, decl ),
1136 decl->get_type(),
1137 ast::ExplicitCast
1138 )
1139 }
1140 )
1141 );
1142 }
1143 )
1144 )
1145 );
1146
1147 assert( generic_func );
1148
1149 // In Reverse Order:
1150 mutBody->push_front(
1151 new ast::DeclStmt( location, new ast::ObjectDecl(
1152 location,
1153 "__guard",
1154 new ast::StructInstType( guard_decl ),
1155 new ast::ListInit(
1156 location,
1157 {
1158 new ast::SingleInit( location,
1159 new ast::VariableExpr( location, monitors ) ),
1160 new ast::SingleInit( location,
1161 ast::ConstantExpr::from_ulong( location, args.size() ) ),
1162 new ast::SingleInit( location, new ast::CastExpr(
1163 location,
1164 new ast::VariableExpr( location, func ),
1165 generic_func,
1166 ast::ExplicitCast
1167 ) ),
1168 },
1169 {},
1170 ast::MaybeConstruct
1171 )
1172 ))
1173 );
1174
1175 // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1176 mutBody->push_front( new ast::DeclStmt( location, monitors ) );
1177
1178 return mutBody;
1179}
1180
1181// generates a cast to the void ptr to the appropriate lock type and dereferences it before calling lock or unlock on it
1182// used to undo the type erasure done by storing all the lock pointers as void
1183ast::ExprStmt * MutexKeyword::genVirtLockUnlockExpr( const std::string & fnName, ast::ptr<ast::Expr> expr, const CodeLocation & location, ast::Expr * param ) {
1184 return new ast::ExprStmt( location,
1185 new ast::UntypedExpr( location,
1186 new ast::NameExpr( location, fnName ), {
1187 ast::UntypedExpr::createDeref(
1188 location,
1189 new ast::CastExpr( location,
1190 param,
1191 new ast::PointerType( new ast::TypeofType( new ast::UntypedExpr(
1192 expr->location,
1193 new ast::NameExpr( expr->location, "__get_mutexstmt_lock_type" ),
1194 { expr }
1195 ) ) ),
1196 ast::GeneratedFlag::ExplicitCast
1197 )
1198 )
1199 }
1200 )
1201 );
1202}
1203
1204ast::IfStmt * MutexKeyword::genTypeDiscrimLockUnlock( const std::string & fnName, const std::vector<ast::ptr<ast::Expr>> & args, const CodeLocation & location, ast::UntypedExpr * thisParam ) {
1205 ast::IfStmt * outerLockIf = nullptr;
1206 ast::IfStmt * lastLockIf = nullptr;
1207
1208 //adds an if/elif clause for each lock to assign type from void ptr based on ptr address
1209 for ( long unsigned int i = 0; i < args.size(); i++ ) {
1210
1211 ast::UntypedExpr * ifCond = new ast::UntypedExpr( location,
1212 new ast::NameExpr( location, "?==?" ), {
1213 ast::deepCopy( thisParam ),
1214 new ast::CastExpr( location, new ast::AddressExpr( location, args.at(i) ), new ast::PointerType( new ast::VoidType() ))
1215 }
1216 );
1217
1218 ast::IfStmt * currLockIf = new ast::IfStmt(
1219 location,
1220 ifCond,
1221 genVirtLockUnlockExpr( fnName, args.at(i), location, ast::deepCopy( thisParam ) )
1222 );
1223
1224 if ( i == 0 ) {
1225 outerLockIf = currLockIf;
1226 } else {
1227 // add ifstmt to else of previous stmt
1228 lastLockIf->else_ = currLockIf;
1229 }
1230
1231 lastLockIf = currLockIf;
1232 }
1233 return outerLockIf;
1234}
1235
1236void flattenTuple( const ast::UntypedTupleExpr * tuple, std::vector<ast::ptr<ast::Expr>> & output ) {
1237 for ( auto & expr : tuple->exprs ) {
1238 const ast::UntypedTupleExpr * innerTuple = dynamic_cast<const ast::UntypedTupleExpr *>(expr.get());
1239 if ( innerTuple ) flattenTuple( innerTuple, output );
1240 else output.emplace_back( ast::deepCopy( expr ));
1241 }
1242}
1243
1244ast::CompoundStmt * MutexKeyword::addStatements(
1245 const ast::CompoundStmt * body,
1246 const std::vector<ast::ptr<ast::Expr>> & args ) {
1247
1248 // Code is generated near the beginning of the compound statement.
1249 const CodeLocation & location = body->location;
1250
1251 // final body to return
1252 ast::CompoundStmt * newBody = new ast::CompoundStmt( location );
1253
1254 // std::string lockFnName = mutex_func_namer.newName();
1255 // std::string unlockFnName = mutex_func_namer.newName();
1256
1257 // If any arguments to the mutex stmt are tuples, flatten them
1258 std::vector<ast::ptr<ast::Expr>> flattenedArgs;
1259 for ( auto & arg : args ) {
1260 const ast::UntypedTupleExpr * tuple = dynamic_cast<const ast::UntypedTupleExpr *>(args.at(0).get());
1261 if ( tuple ) flattenTuple( tuple, flattenedArgs );
1262 else flattenedArgs.emplace_back( ast::deepCopy( arg ));
1263 }
1264
1265 // Make pointer to the monitors.
1266 ast::ObjectDecl * monitors = new ast::ObjectDecl(
1267 location,
1268 "__monitors",
1269 new ast::ArrayType(
1270 new ast::PointerType(
1271 new ast::VoidType()
1272 ),
1273 ast::ConstantExpr::from_ulong( location, flattenedArgs.size() ),
1274 ast::FixedLen,
1275 ast::DynamicDim
1276 ),
1277 new ast::ListInit(
1278 location,
1279 map_range<std::vector<ast::ptr<ast::Init>>>(
1280 flattenedArgs, [](const ast::Expr * expr) {
1281 return new ast::SingleInit(
1282 expr->location,
1283 new ast::UntypedExpr(
1284 expr->location,
1285 new ast::NameExpr( expr->location, "__get_mutexstmt_lock_ptr" ),
1286 { expr }
1287 )
1288 );
1289 }
1290 )
1291 )
1292 );
1293
1294 ast::StructInstType * lock_guard_struct =
1295 new ast::StructInstType( lock_guard_decl );
1296
1297 // use try stmts to lock and finally to unlock
1298 ast::TryStmt * outerTry = nullptr;
1299 ast::TryStmt * currentTry;
1300 ast::CompoundStmt * lastBody = nullptr;
1301
1302 // adds a nested try stmt for each lock we are locking
1303 for ( long unsigned int i = 0; i < flattenedArgs.size(); i++ ) {
1304 ast::UntypedExpr * innerAccess = new ast::UntypedExpr(
1305 location,
1306 new ast::NameExpr( location,"?[?]" ), {
1307 new ast::NameExpr( location, "__monitors" ),
1308 ast::ConstantExpr::from_int( location, i )
1309 }
1310 );
1311
1312 // make the try body
1313 ast::CompoundStmt * currTryBody = new ast::CompoundStmt( location );
1314 ast::IfStmt * lockCall = genTypeDiscrimLockUnlock( "lock", flattenedArgs, location, innerAccess );
1315 currTryBody->push_back( lockCall );
1316
1317 // make the finally stmt
1318 ast::CompoundStmt * currFinallyBody = new ast::CompoundStmt( location );
1319 ast::IfStmt * unlockCall = genTypeDiscrimLockUnlock( "unlock", flattenedArgs, location, innerAccess );
1320 currFinallyBody->push_back( unlockCall );
1321
1322 // construct the current try
1323 currentTry = new ast::TryStmt(
1324 location,
1325 currTryBody,
1326 {},
1327 new ast::FinallyClause( location, currFinallyBody )
1328 );
1329 if ( i == 0 ) outerTry = currentTry;
1330 else {
1331 // pushback try into the body of the outer try
1332 lastBody->push_back( currentTry );
1333 }
1334 lastBody = currTryBody;
1335 }
1336
1337 // push body into innermost try body
1338 if ( lastBody != nullptr ) {
1339 lastBody->push_back( body );
1340 newBody->push_front( outerTry );
1341 }
1342
1343 // monitor_guard_t __guard = { __monitors, # };
1344 newBody->push_front(
1345 new ast::DeclStmt(
1346 location,
1347 new ast::ObjectDecl(
1348 location,
1349 "__guard",
1350 lock_guard_struct,
1351 new ast::ListInit(
1352 location,
1353 {
1354 new ast::SingleInit(
1355 location,
1356 new ast::VariableExpr( location, monitors ) ),
1357 new ast::SingleInit(
1358 location,
1359 ast::ConstantExpr::from_ulong( location, flattenedArgs.size() ) ),
1360 },
1361 {},
1362 ast::MaybeConstruct
1363 )
1364 )
1365 )
1366 );
1367
1368 // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1369 newBody->push_front( new ast::DeclStmt( location, monitors ) );
1370
1371 // // The parameter for both __lock_curr/__unlock_curr routines.
1372 // ast::ObjectDecl * this_decl = new ast::ObjectDecl(
1373 // location,
1374 // "this",
1375 // new ast::PointerType( new ast::VoidType() ),
1376 // nullptr,
1377 // {},
1378 // ast::Linkage::Cforall
1379 // );
1380
1381 // ast::FunctionDecl * lock_decl = new ast::FunctionDecl(
1382 // location,
1383 // lockFnName,
1384 // { /* forall */ },
1385 // {
1386 // // Copy the declaration of this.
1387 // this_decl,
1388 // },
1389 // { /* returns */ },
1390 // nullptr,
1391 // 0,
1392 // ast::Linkage::Cforall,
1393 // { /* attributes */ },
1394 // ast::Function::Inline
1395 // );
1396
1397 // ast::FunctionDecl * unlock_decl = new ast::FunctionDecl(
1398 // location,
1399 // unlockFnName,
1400 // { /* forall */ },
1401 // {
1402 // // Copy the declaration of this.
1403 // ast::deepCopy( this_decl ),
1404 // },
1405 // { /* returns */ },
1406 // nullptr,
1407 // 0,
1408 // ast::Linkage::Cforall,
1409 // { /* attributes */ },
1410 // ast::Function::Inline
1411 // );
1412
1413 // ast::IfStmt * outerLockIf = nullptr;
1414 // ast::IfStmt * outerUnlockIf = nullptr;
1415 // ast::IfStmt * lastLockIf = nullptr;
1416 // ast::IfStmt * lastUnlockIf = nullptr;
1417
1418 // //adds an if/elif clause for each lock to assign type from void ptr based on ptr address
1419 // for ( long unsigned int i = 0; i < args.size(); i++ ) {
1420 // ast::VariableExpr * thisParam = new ast::VariableExpr( location, InitTweak::getParamThis( lock_decl ) );
1421 // ast::UntypedExpr * ifCond = new ast::UntypedExpr( location,
1422 // new ast::NameExpr( location, "?==?" ), {
1423 // thisParam,
1424 // new ast::CastExpr( location, new ast::AddressExpr( location, args.at(i) ), new ast::PointerType( new ast::VoidType() ))
1425 // }
1426 // );
1427
1428 // ast::IfStmt * currLockIf = new ast::IfStmt(
1429 // location,
1430 // ast::deepCopy( ifCond ),
1431 // genVirtLockUnlockExpr( "lock", args.at(i), location, ast::deepCopy( thisParam ) )
1432 // );
1433
1434 // ast::IfStmt * currUnlockIf = new ast::IfStmt(
1435 // location,
1436 // ifCond,
1437 // genVirtLockUnlockExpr( "unlock", args.at(i), location, ast::deepCopy( thisParam ) )
1438 // );
1439
1440 // if ( i == 0 ) {
1441 // outerLockIf = currLockIf;
1442 // outerUnlockIf = currUnlockIf;
1443 // } else {
1444 // // add ifstmt to else of previous stmt
1445 // lastLockIf->else_ = currLockIf;
1446 // lastUnlockIf->else_ = currUnlockIf;
1447 // }
1448
1449 // lastLockIf = currLockIf;
1450 // lastUnlockIf = currUnlockIf;
1451 // }
1452
1453 // // add pointer typing if/elifs to body of routines
1454 // lock_decl->stmts = new ast::CompoundStmt( location, { outerLockIf } );
1455 // unlock_decl->stmts = new ast::CompoundStmt( location, { outerUnlockIf } );
1456
1457 // // add routines to scope
1458 // declsToAddBefore.push_back( lock_decl );
1459 // declsToAddBefore.push_back( unlock_decl );
1460
1461 // newBody->push_front(new ast::DeclStmt( location, lock_decl ));
1462 // newBody->push_front(new ast::DeclStmt( location, unlock_decl ));
1463
1464 return newBody;
1465}
1466
1467ast::CompoundStmt * MutexKeyword::addThreadDtorStatements(
1468 const ast::FunctionDecl*, const ast::CompoundStmt * body,
1469 const std::vector<const ast::DeclWithType * > & args ) {
1470 assert( args.size() == 1 );
1471 const ast::DeclWithType * arg = args.front();
1472 const ast::Type * argType = arg->get_type();
1473 assert( argType->is_mutex() );
1474
1475 ast::CompoundStmt * mutBody = ast::mutate( body );
1476
1477 // The code is generated near the front of the body.
1478 const CodeLocation & location = mutBody->location;
1479
1480 // thread_dtor_guard_t __guard = { this, intptr( 0 ) };
1481 mutBody->push_front( new ast::DeclStmt(
1482 location,
1483 new ast::ObjectDecl(
1484 location,
1485 "__guard",
1486 new ast::StructInstType( thread_guard_decl ),
1487 new ast::ListInit(
1488 location,
1489 {
1490 new ast::SingleInit( location,
1491 new ast::CastExpr( location,
1492 new ast::VariableExpr( location, arg ), argType ) ),
1493 new ast::SingleInit(
1494 location,
1495 new ast::UntypedExpr(
1496 location,
1497 new ast::NameExpr( location, "intptr" ), {
1498 ast::ConstantExpr::from_int( location, 0 ),
1499 }
1500 ) ),
1501 },
1502 {},
1503 ast::MaybeConstruct
1504 )
1505 )
1506 ));
1507
1508 return mutBody;
1509}
1510
1511ast::ptr<ast::Type> MutexKeyword::generic_func =
1512 new ast::FunctionType( ast::FixedArgs );
1513
1514// --------------------------------------------------------------------------
1515struct ThreadStarter final {
1516 void previsit( const ast::StructDecl * decl );
1517 const ast::FunctionDecl * postvisit( const ast::FunctionDecl * decl );
1518
1519private:
1520 bool thread_ctor_seen = false;
1521 const ast::StructDecl * thread_decl = nullptr;
1522};
1523
1524void ThreadStarter::previsit( const ast::StructDecl * decl ) {
1525 if ( decl->body && decl->name == "thread$" ) {
1526 assert( !thread_decl );
1527 thread_decl = decl;
1528 }
1529}
1530
1531const ast::FunctionDecl * ThreadStarter::postvisit( const ast::FunctionDecl * decl ) {
1532 if ( !CodeGen::isConstructor( decl->name ) ) return decl;
1533
1534 // Seach for the thread constructor.
1535 // (Are the "prefixes" of these to blocks the same?)
1536 const ast::Type * typeof_this = InitTweak::getTypeofThis( decl->type );
1537 auto ctored_type = dynamic_cast<const ast::StructInstType *>( typeof_this );
1538 if ( ctored_type && ctored_type->base == thread_decl ) {
1539 thread_ctor_seen = true;
1540 }
1541
1542 // Modify this declaration, the extra checks to see if we will are first.
1543 const ast::ptr<ast::DeclWithType> & param = decl->params.front();
1544 auto type = dynamic_cast<const ast::StructInstType *>(
1545 ast::getPointerBase( param->get_type() ) );
1546 if ( nullptr == type ) return decl;
1547 if ( !type->base->is_thread() ) return decl;
1548 if ( !thread_decl || !thread_ctor_seen ) {
1549 SemanticError( type->base->location, "thread keyword requires threads to be in scope, add #include <thread.hfa>." );
1550 }
1551 const ast::CompoundStmt * stmt = decl->stmts;
1552 if ( nullptr == stmt ) return decl;
1553
1554 // Now do the actual modification:
1555 ast::CompoundStmt * mutStmt = ast::mutate( stmt );
1556 const CodeLocation & location = mutStmt->location;
1557 mutStmt->push_back(
1558 new ast::ExprStmt(
1559 location,
1560 new ast::UntypedExpr(
1561 location,
1562 new ast::NameExpr( location, "__thrd_start" ),
1563 {
1564 new ast::VariableExpr( location, param ),
1565 new ast::NameExpr( location, "main" ),
1566 }
1567 )
1568 )
1569 );
1570
1571 return ast::mutate_field( decl, &ast::FunctionDecl::stmts, mutStmt );
1572}
1573
1574} // namespace
1575
1576// --------------------------------------------------------------------------
1577// Interface Functions:
1578
1579void implementKeywords( ast::TranslationUnit & translationUnit ) {
1580 ast::Pass<ThreadKeyword>::run( translationUnit );
1581 ast::Pass<CoroutineKeyword>::run( translationUnit );
1582 ast::Pass<MonitorKeyword>::run( translationUnit );
1583 ast::Pass<GeneratorKeyword>::run( translationUnit );
1584 ast::Pass<SuspendKeyword>::run( translationUnit );
1585}
1586
1587void implementMutex( ast::TranslationUnit & translationUnit ) {
1588 ast::Pass<MutexKeyword>::run( translationUnit );
1589}
1590
1591void implementThreadStarter( ast::TranslationUnit & translationUnit ) {
1592 ast::Pass<ThreadStarter>::run( translationUnit );
1593}
1594
1595}
1596
1597// Local Variables: //
1598// tab-width: 4 //
1599// mode: c++ //
1600// compile-command: "make install" //
1601// End: //
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