source: src/Concurrency/Keywords.cc@ 3945abe

ADT ast-experimental enum forall-pointer-decay jacob/cs343-translation new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 3945abe was e84ab3d, checked in by Thierry Delisle <tdelisle@…>, 4 years ago

Step 1 of changing $thread to thread$
  • Property mode set to 100644
File size: 36.5 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.cc --
8//
9// Author : Thierry Delisle
10// Created On : Mon Mar 13 12:41:22 2017
11// Last Modified By :
12// Last Modified On :
13// Update Count : 10
14//
15
16#include "Concurrency/Keywords.h"
17
18#include <cassert> // for assert
19#include <string> // for string, operator==
20
21#include <iostream>
22
23#include "Common/Examine.h" // for isMainFor
24#include "Common/PassVisitor.h" // for PassVisitor
25#include "Common/SemanticError.h" // for SemanticError
26#include "Common/utility.h" // for deleteAll, map_range
27#include "CodeGen/OperatorTable.h" // for isConstructor
28#include "ControlStruct/LabelGenerator.h" // for LebelGenerator
29#include "InitTweak/InitTweak.h" // for getPointerBase
30#include "SynTree/LinkageSpec.h" // for Cforall
31#include "SynTree/Constant.h" // for Constant
32#include "SynTree/Declaration.h" // for StructDecl, FunctionDecl, ObjectDecl
33#include "SynTree/Expression.h" // for VariableExpr, ConstantExpr, Untype...
34#include "SynTree/Initializer.h" // for SingleInit, ListInit, Initializer ...
35#include "SynTree/Label.h" // for Label
36#include "SynTree/Statement.h" // for CompoundStmt, DeclStmt, ExprStmt
37#include "SynTree/Type.h" // for StructInstType, Type, PointerType
38#include "SynTree/Visitor.h" // for Visitor, acceptAll
39#include "Virtual/Tables.h"
40
41class Attribute;
42
43namespace Concurrency {
44 inline static std::string getTypeIdName( std::string const & exception_name ) {
45 return exception_name.empty() ? std::string() : Virtual::typeIdType( exception_name );
46 }
47 inline static std::string getVTableName( std::string const & exception_name ) {
48 return exception_name.empty() ? std::string() : Virtual::vtableTypeName( exception_name );
49 }
50
51 // Only detects threads constructed with the keyword thread.
52 inline static bool isThread( DeclarationWithType * decl ) {
53 Type * baseType = decl->get_type()->stripDeclarator();
54 StructInstType * instType = dynamic_cast<StructInstType *>( baseType );
55 if ( nullptr == instType ) { return false; }
56 return instType->baseStruct->is_thread();
57 }
58
59 //=============================================================================================
60 // Pass declarations
61 //=============================================================================================
62
63 //-----------------------------------------------------------------------------
64 //Handles sue type declarations :
65 // sue MyType { struct MyType {
66 // int data; int data;
67 // a_struct_t more_data; a_struct_t more_data;
68 // => NewField_t newField;
69 // }; };
70 // static inline NewField_t * getter_name( MyType * this ) { return &this->newField; }
71 //
72 class ConcurrentSueKeyword : public WithDeclsToAdd {
73 public:
74
75 ConcurrentSueKeyword( std::string&& type_name, std::string&& field_name,
76 std::string&& getter_name, std::string&& context_error, std::string&& exception_name,
77 bool needs_main, AggregateDecl::Aggregate cast_target ) :
78 type_name( type_name ), field_name( field_name ), getter_name( getter_name ),
79 context_error( context_error ), exception_name( exception_name ),
80 typeid_name( getTypeIdName( exception_name ) ),
81 vtable_name( getVTableName( exception_name ) ),
82 needs_main( needs_main ), cast_target( cast_target ) {}
83
84 virtual ~ConcurrentSueKeyword() {}
85
86 Declaration * postmutate( StructDecl * decl );
87 DeclarationWithType * postmutate( FunctionDecl * decl );
88
89 void handle( StructDecl * );
90 void addTypeId( StructDecl * );
91 void addVtableForward( StructDecl * );
92 FunctionDecl * forwardDeclare( StructDecl * );
93 ObjectDecl * addField( StructDecl * );
94 void addRoutines( ObjectDecl *, FunctionDecl * );
95
96 virtual bool is_target( StructDecl * decl ) = 0;
97
98 Expression * postmutate( KeywordCastExpr * cast );
99
100 private:
101 const std::string type_name;
102 const std::string field_name;
103 const std::string getter_name;
104 const std::string context_error;
105 const std::string exception_name;
106 const std::string typeid_name;
107 const std::string vtable_name;
108 bool needs_main;
109 AggregateDecl::Aggregate cast_target;
110
111 StructDecl * type_decl = nullptr;
112 FunctionDecl * dtor_decl = nullptr;
113 StructDecl * except_decl = nullptr;
114 StructDecl * typeid_decl = nullptr;
115 StructDecl * vtable_decl = nullptr;
116 };
117
118
119 //-----------------------------------------------------------------------------
120 //Handles thread type declarations :
121 // thread Mythread { struct MyThread {
122 // int data; int data;
123 // a_struct_t more_data; a_struct_t more_data;
124 // => thread$ __thrd_d;
125 // }; };
126 // static inline thread$ * get_thread( MyThread * this ) { return &this->__thrd_d; }
127 //
128 class ThreadKeyword final : public ConcurrentSueKeyword {
129 public:
130
131 ThreadKeyword() : ConcurrentSueKeyword(
132 "thread$",
133 "__thrd",
134 "get_thread",
135 "thread keyword requires threads to be in scope, add #include <thread.hfa>\n",
136 "ThreadCancelled",
137 true,
138 AggregateDecl::Thread
139 )
140 {}
141
142 virtual ~ThreadKeyword() {}
143
144 virtual bool is_target( StructDecl * decl ) override final { return decl->is_thread(); }
145
146 static void implement( std::list< Declaration * > & translationUnit ) {
147 PassVisitor< ThreadKeyword > impl;
148 mutateAll( translationUnit, impl );
149 }
150 };
151
152 //-----------------------------------------------------------------------------
153 //Handles coroutine type declarations :
154 // coroutine MyCoroutine { struct MyCoroutine {
155 // int data; int data;
156 // a_struct_t more_data; a_struct_t more_data;
157 // => coroutine$ __cor_d;
158 // }; };
159 // static inline coroutine$ * get_coroutine( MyCoroutine * this ) { return &this->__cor_d; }
160 //
161 class CoroutineKeyword final : public ConcurrentSueKeyword {
162 public:
163
164 CoroutineKeyword() : ConcurrentSueKeyword(
165 "coroutine$",
166 "__cor",
167 "get_coroutine",
168 "coroutine keyword requires coroutines to be in scope, add #include <coroutine.hfa>\n",
169 "CoroutineCancelled",
170 true,
171 AggregateDecl::Coroutine
172 )
173 {}
174
175 virtual ~CoroutineKeyword() {}
176
177 virtual bool is_target( StructDecl * decl ) override final { return decl->is_coroutine(); }
178
179 static void implement( std::list< Declaration * > & translationUnit ) {
180 PassVisitor< CoroutineKeyword > impl;
181 mutateAll( translationUnit, impl );
182 }
183 };
184
185
186
187 //-----------------------------------------------------------------------------
188 //Handles monitor type declarations :
189 // monitor MyMonitor { struct MyMonitor {
190 // int data; int data;
191 // a_struct_t more_data; a_struct_t more_data;
192 // => monitor$ __mon_d;
193 // }; };
194 // static inline monitor$ * get_coroutine( MyMonitor * this ) { return &this->__cor_d; }
195 //
196 class MonitorKeyword final : public ConcurrentSueKeyword {
197 public:
198
199 MonitorKeyword() : ConcurrentSueKeyword(
200 "monitor$",
201 "__mon",
202 "get_monitor",
203 "monitor keyword requires monitors to be in scope, add #include <monitor.hfa>\n",
204 "",
205 false,
206 AggregateDecl::Monitor
207 )
208 {}
209
210 virtual ~MonitorKeyword() {}
211
212 virtual bool is_target( StructDecl * decl ) override final { return decl->is_monitor(); }
213
214 static void implement( std::list< Declaration * > & translationUnit ) {
215 PassVisitor< MonitorKeyword > impl;
216 mutateAll( translationUnit, impl );
217 }
218 };
219
220 //-----------------------------------------------------------------------------
221 //Handles generator type declarations :
222 // generator MyGenerator { struct MyGenerator {
223 // int data; int data;
224 // a_struct_t more_data; a_struct_t more_data;
225 // => int __gen_next;
226 // }; };
227 //
228 class GeneratorKeyword final : public ConcurrentSueKeyword {
229 public:
230
231 GeneratorKeyword() : ConcurrentSueKeyword(
232 "generator$",
233 "__generator_state",
234 "get_generator",
235 "Unable to find builtin type generator$\n",
236 "",
237 true,
238 AggregateDecl::Generator
239 )
240 {}
241
242 virtual ~GeneratorKeyword() {}
243
244 virtual bool is_target( StructDecl * decl ) override final { return decl->is_generator(); }
245
246 static void implement( std::list< Declaration * > & translationUnit ) {
247 PassVisitor< GeneratorKeyword > impl;
248 mutateAll( translationUnit, impl );
249 }
250 };
251
252
253 //-----------------------------------------------------------------------------
254 class SuspendKeyword final : public WithStmtsToAdd, public WithGuards {
255 public:
256 SuspendKeyword() = default;
257 virtual ~SuspendKeyword() = default;
258
259 void premutate( FunctionDecl * );
260 DeclarationWithType * postmutate( FunctionDecl * );
261
262 Statement * postmutate( SuspendStmt * );
263
264 static void implement( std::list< Declaration * > & translationUnit ) {
265 PassVisitor< SuspendKeyword > impl;
266 mutateAll( translationUnit, impl );
267 }
268
269 private:
270 bool is_real_suspend( FunctionDecl * );
271
272 Statement * make_generator_suspend( SuspendStmt * );
273 Statement * make_coroutine_suspend( SuspendStmt * );
274
275 struct LabelPair {
276 Label obj;
277 int idx;
278 };
279
280 LabelPair make_label() {
281 labels.push_back( gen.newLabel("generator") );
282 return { labels.back(), int(labels.size()) };
283 }
284
285 DeclarationWithType * in_generator = nullptr;
286 FunctionDecl * decl_suspend = nullptr;
287 std::vector<Label> labels;
288 ControlStruct::LabelGenerator & gen = *ControlStruct::LabelGenerator::getGenerator();
289 };
290
291 //-----------------------------------------------------------------------------
292 //Handles mutex routines definitions :
293 // void foo( A * mutex a, B * mutex b, int i ) { void foo( A * a, B * b, int i ) {
294 // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
295 // monitor_guard_t __guard = { __monitors, 2 };
296 // /*Some code*/ => /*Some code*/
297 // } }
298 //
299 class MutexKeyword final {
300 public:
301
302 void postvisit( FunctionDecl * decl );
303 void postvisit( StructDecl * decl );
304
305 std::list<DeclarationWithType*> findMutexArgs( FunctionDecl*, bool & first );
306 void validate( DeclarationWithType * );
307 void addDtorStatements( FunctionDecl* func, CompoundStmt *, const std::list<DeclarationWithType * > &);
308 void addStatements( FunctionDecl* func, CompoundStmt *, const std::list<DeclarationWithType * > &);
309 void addThreadDtorStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args );
310
311 static void implement( std::list< Declaration * > & translationUnit ) {
312 PassVisitor< MutexKeyword > impl;
313 acceptAll( translationUnit, impl );
314 }
315
316 private:
317 StructDecl* monitor_decl = nullptr;
318 StructDecl* guard_decl = nullptr;
319 StructDecl* dtor_guard_decl = nullptr;
320 StructDecl* thread_guard_decl = nullptr;
321
322 static std::unique_ptr< Type > generic_func;
323 };
324
325 std::unique_ptr< Type > MutexKeyword::generic_func = std::unique_ptr< Type >(
326 new FunctionType(
327 noQualifiers,
328 true
329 )
330 );
331
332 //-----------------------------------------------------------------------------
333 //Handles mutex routines definitions :
334 // void foo( A * mutex a, B * mutex b, int i ) { void foo( A * a, B * b, int i ) {
335 // monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
336 // monitor_guard_t __guard = { __monitors, 2 };
337 // /*Some code*/ => /*Some code*/
338 // } }
339 //
340 class ThreadStarter final {
341 public:
342
343 void postvisit( FunctionDecl * decl );
344 void previsit ( StructDecl * decl );
345
346 void addStartStatement( FunctionDecl * decl, DeclarationWithType * param );
347
348 static void implement( std::list< Declaration * > & translationUnit ) {
349 PassVisitor< ThreadStarter > impl;
350 acceptAll( translationUnit, impl );
351 }
352
353 private :
354 bool thread_ctor_seen = false;
355 StructDecl * thread_decl = nullptr;
356 };
357
358 //=============================================================================================
359 // General entry routine
360 //=============================================================================================
361 void applyKeywords( std::list< Declaration * > & translationUnit ) {
362 ThreadKeyword ::implement( translationUnit );
363 CoroutineKeyword ::implement( translationUnit );
364 MonitorKeyword ::implement( translationUnit );
365 GeneratorKeyword ::implement( translationUnit );
366 SuspendKeyword ::implement( translationUnit );
367 }
368
369 void implementMutexFuncs( std::list< Declaration * > & translationUnit ) {
370 MutexKeyword ::implement( translationUnit );
371 }
372
373 void implementThreadStarter( std::list< Declaration * > & translationUnit ) {
374 ThreadStarter ::implement( translationUnit );
375 }
376
377 //=============================================================================================
378 // Generic keyword implementation
379 //=============================================================================================
380 void fixupGenerics(FunctionType * func, StructDecl * decl) {
381 cloneAll(decl->parameters, func->forall);
382 for ( TypeDecl * td : func->forall ) {
383 strict_dynamic_cast<StructInstType*>(
384 func->parameters.front()->get_type()->stripReferences()
385 )->parameters.push_back(
386 new TypeExpr( new TypeInstType( noQualifiers, td->name, td ) )
387 );
388 }
389 }
390
391 Declaration * ConcurrentSueKeyword::postmutate(StructDecl * decl) {
392 if( decl->name == type_name && decl->body ) {
393 assert( !type_decl );
394 type_decl = decl;
395 }
396 else if ( is_target(decl) ) {
397 handle( decl );
398 }
399 else if ( !except_decl && exception_name == decl->name && decl->body ) {
400 except_decl = decl;
401 }
402 else if ( !typeid_decl && typeid_name == decl->name && decl->body ) {
403 typeid_decl = decl;
404 }
405 else if ( !vtable_decl && vtable_name == decl->name && decl->body ) {
406 vtable_decl = decl;
407 }
408 // Might be able to get ride of is target.
409 assert( is_target(decl) == (cast_target == decl->kind) );
410 return decl;
411 }
412
413 DeclarationWithType * ConcurrentSueKeyword::postmutate( FunctionDecl * decl ) {
414 if ( type_decl && isDestructorFor( decl, type_decl ) )
415 dtor_decl = decl;
416 else if ( vtable_name.empty() || !decl->has_body() )
417 ;
418 else if ( auto param = isMainFor( decl, cast_target ) ) {
419 // This should never trigger.
420 assert( vtable_decl );
421 // Should be safe because of isMainFor.
422 StructInstType * struct_type = static_cast<StructInstType *>(
423 static_cast<ReferenceType *>( param->get_type() )->base );
424 assert( struct_type );
425
426 std::list< Expression * > poly_args = { new TypeExpr( struct_type->clone() ) };
427 ObjectDecl * vtable_object = Virtual::makeVtableInstance(
428 "_default_vtable_object_declaration",
429 vtable_decl->makeInst( poly_args ), struct_type, nullptr );
430 declsToAddAfter.push_back( vtable_object );
431 declsToAddAfter.push_back(
432 new ObjectDecl(
433 Virtual::concurrentDefaultVTableName(),
434 noStorageClasses,
435 LinkageSpec::Cforall,
436 /* bitfieldWidth */ nullptr,
437 new ReferenceType( Type::Const, vtable_object->type->clone() ),
438 new SingleInit( new VariableExpr( vtable_object ) )
439 )
440 );
441 declsToAddAfter.push_back( Virtual::makeGetExceptionFunction(
442 vtable_object, except_decl->makeInst( std::move( poly_args ) )
443 ) );
444 }
445
446 return decl;
447 }
448
449 Expression * ConcurrentSueKeyword::postmutate( KeywordCastExpr * cast ) {
450 if ( cast_target == cast->target ) {
451 // convert (thread &)t to (thread$ &)*get_thread(t), etc.
452 if( !type_decl ) SemanticError( cast, context_error );
453 if( !dtor_decl ) SemanticError( cast, context_error );
454 assert( cast->result == nullptr );
455 cast->set_result( new ReferenceType( noQualifiers, new StructInstType( noQualifiers, type_decl ) ) );
456 cast->concrete_target.field = field_name;
457 cast->concrete_target.getter = getter_name;
458 }
459 return cast;
460 }
461
462
463 void ConcurrentSueKeyword::handle( StructDecl * decl ) {
464 if( ! decl->body ) return;
465
466 if( !type_decl ) SemanticError( decl, context_error );
467 if( !dtor_decl ) SemanticError( decl, context_error );
468
469 if ( !exception_name.empty() ) {
470 if( !typeid_decl ) SemanticError( decl, context_error );
471 if( !vtable_decl ) SemanticError( decl, context_error );
472
473 addTypeId( decl );
474 addVtableForward( decl );
475 }
476 FunctionDecl * func = forwardDeclare( decl );
477 ObjectDecl * field = addField( decl );
478 addRoutines( field, func );
479 }
480
481 void ConcurrentSueKeyword::addTypeId( StructDecl * decl ) {
482 assert( typeid_decl );
483 StructInstType typeid_type( Type::Const, typeid_decl );
484 typeid_type.parameters.push_back( new TypeExpr(
485 new StructInstType( noQualifiers, decl )
486 ) );
487 declsToAddBefore.push_back( Virtual::makeTypeIdInstance( &typeid_type ) );
488 }
489
490 void ConcurrentSueKeyword::addVtableForward( StructDecl * decl ) {
491 assert( vtable_decl );
492 std::list< Expression * > poly_args = {
493 new TypeExpr( new StructInstType( noQualifiers, decl ) ),
494 };
495 declsToAddBefore.push_back( Virtual::makeGetExceptionForward(
496 vtable_decl->makeInst( poly_args ),
497 except_decl->makeInst( poly_args )
498 ) );
499 ObjectDecl * vtable_object = Virtual::makeVtableForward(
500 "_default_vtable_object_declaration",
501 vtable_decl->makeInst( move( poly_args ) ) );
502 declsToAddBefore.push_back( vtable_object );
503 declsToAddBefore.push_back(
504 new ObjectDecl(
505 Virtual::concurrentDefaultVTableName(),
506 Type::StorageClasses( Type::Extern ),
507 LinkageSpec::Cforall,
508 /* bitfieldWidth */ nullptr,
509 new ReferenceType( Type::Const, vtable_object->type->clone() ),
510 /* init */ nullptr
511 )
512 );
513 }
514
515 FunctionDecl * ConcurrentSueKeyword::forwardDeclare( StructDecl * decl ) {
516
517 StructDecl * forward = decl->clone();
518 forward->set_body( false );
519 deleteAll( forward->get_members() );
520 forward->get_members().clear();
521
522 FunctionType * get_type = new FunctionType( noQualifiers, false );
523 ObjectDecl * this_decl = new ObjectDecl(
524 "this",
525 noStorageClasses,
526 LinkageSpec::Cforall,
527 nullptr,
528 new ReferenceType(
529 noQualifiers,
530 new StructInstType(
531 noQualifiers,
532 decl
533 )
534 ),
535 nullptr
536 );
537
538 get_type->get_parameters().push_back( this_decl->clone() );
539 get_type->get_returnVals().push_back(
540 new ObjectDecl(
541 "ret",
542 noStorageClasses,
543 LinkageSpec::Cforall,
544 nullptr,
545 new PointerType(
546 noQualifiers,
547 new StructInstType(
548 noQualifiers,
549 type_decl
550 )
551 ),
552 nullptr
553 )
554 );
555 fixupGenerics(get_type, decl);
556
557 FunctionDecl * get_decl = new FunctionDecl(
558 getter_name,
559 Type::Static,
560 LinkageSpec::Cforall,
561 get_type,
562 nullptr,
563 { new Attribute("const") },
564 Type::Inline
565 );
566
567 FunctionDecl * main_decl = nullptr;
568
569 if( needs_main ) {
570 FunctionType * main_type = new FunctionType( noQualifiers, false );
571
572 main_type->get_parameters().push_back( this_decl->clone() );
573
574 main_decl = new FunctionDecl(
575 "main",
576 noStorageClasses,
577 LinkageSpec::Cforall,
578 main_type,
579 nullptr
580 );
581 fixupGenerics(main_type, decl);
582 }
583
584 delete this_decl;
585
586 declsToAddBefore.push_back( forward );
587 if( needs_main ) declsToAddBefore.push_back( main_decl );
588 declsToAddBefore.push_back( get_decl );
589
590 return get_decl;
591 }
592
593 ObjectDecl * ConcurrentSueKeyword::addField( StructDecl * decl ) {
594 ObjectDecl * field = new ObjectDecl(
595 field_name,
596 noStorageClasses,
597 LinkageSpec::Cforall,
598 nullptr,
599 new StructInstType(
600 noQualifiers,
601 type_decl
602 ),
603 nullptr
604 );
605
606 decl->get_members().push_back( field );
607
608 return field;
609 }
610
611 void ConcurrentSueKeyword::addRoutines( ObjectDecl * field, FunctionDecl * func ) {
612 CompoundStmt * statement = new CompoundStmt();
613 statement->push_back(
614 new ReturnStmt(
615 new AddressExpr(
616 new MemberExpr(
617 field,
618 new CastExpr(
619 new VariableExpr( func->get_functionType()->get_parameters().front() ),
620 func->get_functionType()->get_parameters().front()->get_type()->stripReferences()->clone(),
621 false
622 )
623 )
624 )
625 )
626 );
627
628 FunctionDecl * get_decl = func->clone();
629
630 get_decl->set_statements( statement );
631
632 declsToAddAfter.push_back( get_decl );
633 }
634
635 //=============================================================================================
636 // Suspend keyword implementation
637 //=============================================================================================
638 bool SuspendKeyword::is_real_suspend( FunctionDecl * func ) {
639 if(isMangled(func->linkage)) return false; // the real suspend isn't mangled
640 if(func->name != "__cfactx_suspend") return false; // the real suspend has a specific name
641 if(func->type->parameters.size() != 0) return false; // Too many parameters
642 if(func->type->returnVals.size() != 0) return false; // Too many return values
643
644 return true;
645 }
646
647 void SuspendKeyword::premutate( FunctionDecl * func ) {
648 GuardValue(in_generator);
649 in_generator = nullptr;
650
651 // Is this the real suspend?
652 if(is_real_suspend(func)) {
653 decl_suspend = decl_suspend ? decl_suspend : func;
654 return;
655 }
656
657 // Is this the main of a generator?
658 auto param = isMainFor( func, AggregateDecl::Aggregate::Generator );
659 if(!param) return;
660
661 if(func->type->returnVals.size() != 0) SemanticError(func->location, "Generator main must return void");
662
663 in_generator = param;
664 GuardValue(labels);
665 labels.clear();
666 }
667
668 DeclarationWithType * SuspendKeyword::postmutate( FunctionDecl * func ) {
669 if( !func->statements ) return func; // Not the actual definition, don't do anything
670 if( !in_generator ) return func; // Not in a generator, don't do anything
671 if( labels.empty() ) return func; // Generator has no states, nothing to do, could throw a warning
672
673 // This is a generator main, we need to add the following code to the top
674 // static void * __generator_labels[] = {&&s0, &&s1, ...};
675 // goto * __generator_labels[gen.__generator_state];
676 const auto & loc = func->location;
677
678 const auto first_label = gen.newLabel("generator");
679
680 // for each label add to declaration
681 std::list<Initializer*> inits = { new SingleInit( new LabelAddressExpr( first_label ) ) };
682 for(const auto & label : labels) {
683 inits.push_back(
684 new SingleInit(
685 new LabelAddressExpr( label )
686 )
687 );
688 }
689 auto init = new ListInit(std::move(inits), noDesignators, true);
690 labels.clear();
691
692 // create decl
693 auto decl = new ObjectDecl(
694 "__generator_labels",
695 Type::StorageClasses( Type::Static ),
696 LinkageSpec::AutoGen,
697 nullptr,
698 new ArrayType(
699 Type::Qualifiers(),
700 new PointerType(
701 Type::Qualifiers(),
702 new VoidType( Type::Qualifiers() )
703 ),
704 nullptr,
705 false, false
706 ),
707 init
708 );
709
710 // create the goto
711 assert(in_generator);
712
713 auto go_decl = new ObjectDecl(
714 "__generator_label",
715 noStorageClasses,
716 LinkageSpec::AutoGen,
717 nullptr,
718 new PointerType(
719 Type::Qualifiers(),
720 new VoidType( Type::Qualifiers() )
721 ),
722 new SingleInit(
723 new UntypedExpr(
724 new NameExpr("?[?]"),
725 {
726 new NameExpr("__generator_labels"),
727 new UntypedMemberExpr(
728 new NameExpr("__generator_state"),
729 new VariableExpr( in_generator )
730 )
731 }
732 )
733 )
734 );
735 go_decl->location = loc;
736
737 auto go = new BranchStmt(
738 new VariableExpr( go_decl ),
739 BranchStmt::Goto
740 );
741 go->location = loc;
742 go->computedTarget->location = loc;
743
744 auto noop = new NullStmt({ first_label });
745 noop->location = loc;
746
747 // wrap everything in a nice compound
748 auto body = new CompoundStmt({
749 new DeclStmt( decl ),
750 new DeclStmt( go_decl ),
751 go,
752 noop,
753 func->statements
754 });
755 body->location = loc;
756 func->statements = body;
757
758 return func;
759 }
760
761 Statement * SuspendKeyword::postmutate( SuspendStmt * stmt ) {
762 SuspendStmt::Type type = stmt->type;
763 if(type == SuspendStmt::None) {
764 // This suspend has a implicit target, find it
765 type = in_generator ? SuspendStmt::Generator : SuspendStmt::Coroutine;
766 }
767
768 // Check that the target makes sense
769 if(!in_generator && type == SuspendStmt::Generator) SemanticError( stmt->location, "'suspend generator' must be used inside main of generator type.");
770
771 // Act appropriately
772 switch(type) {
773 case SuspendStmt::Generator: return make_generator_suspend(stmt);
774 case SuspendStmt::Coroutine: return make_coroutine_suspend(stmt);
775 default: abort();
776 }
777 }
778
779 Statement * SuspendKeyword::make_generator_suspend( SuspendStmt * stmt ) {
780 assert(in_generator);
781 // Target code is :
782 // gen.__generator_state = X;
783 // { THEN }
784 // return;
785 // __gen_X:;
786
787 // Save the location and delete the old statement, we only need the location from this point on
788 auto loc = stmt->location;
789
790 // Build the label and get its index
791 auto label = make_label();
792
793 // Create the context saving statement
794 auto save = new ExprStmt( new UntypedExpr(
795 new NameExpr( "?=?" ),
796 {
797 new UntypedMemberExpr(
798 new NameExpr("__generator_state"),
799 new VariableExpr( in_generator )
800 ),
801 new ConstantExpr(
802 Constant::from_int( label.idx )
803 )
804 }
805 ));
806 assert(save->expr);
807 save->location = loc;
808 stmtsToAddBefore.push_back( save );
809
810 // if we have a then add it here
811 auto then = stmt->then;
812 stmt->then = nullptr;
813 delete stmt;
814 if(then) stmtsToAddBefore.push_back( then );
815
816 // Create the return statement
817 auto ret = new ReturnStmt( nullptr );
818 ret->location = loc;
819 stmtsToAddBefore.push_back( ret );
820
821 // Create the null statement with the created label
822 auto noop = new NullStmt({ label.obj });
823 noop->location = loc;
824
825 // Return the null statement to take the place of the previous statement
826 return noop;
827 }
828
829 Statement * SuspendKeyword::make_coroutine_suspend( SuspendStmt * stmt ) {
830 if(stmt->then) SemanticError( stmt->location, "Compound statement following coroutines is not implemented.");
831
832 // Save the location and delete the old statement, we only need the location from this point on
833 auto loc = stmt->location;
834 delete stmt;
835
836 // Create the call expression
837 if(!decl_suspend) SemanticError( loc, "suspend keyword applied to coroutines requires coroutines to be in scope, add #include <coroutine.hfa>\n");
838 auto expr = new UntypedExpr( VariableExpr::functionPointer( decl_suspend ) );
839 expr->location = loc;
840
841 // Change this statement into a regular expr
842 assert(expr);
843 auto nstmt = new ExprStmt( expr );
844 nstmt->location = loc;
845 return nstmt;
846 }
847
848
849 //=============================================================================================
850 // Mutex keyword implementation
851 //=============================================================================================
852
853 void MutexKeyword::postvisit(FunctionDecl* decl) {
854
855 bool first = false;
856 std::list<DeclarationWithType*> mutexArgs = findMutexArgs( decl, first );
857 bool const isDtor = CodeGen::isDestructor( decl->name );
858
859 // Is this function relevant to monitors
860 if( mutexArgs.empty() ) {
861 // If this is the destructor for a monitor it must be mutex
862 if(isDtor) {
863 Type* ty = decl->get_functionType()->get_parameters().front()->get_type();
864
865 // If it's a copy, it's not a mutex
866 ReferenceType* rty = dynamic_cast< ReferenceType * >( ty );
867 if( ! rty ) return;
868
869 // If we are not pointing directly to a type, it's not a mutex
870 Type* base = rty->get_base();
871 if( dynamic_cast< ReferenceType * >( base ) ) return;
872 if( dynamic_cast< PointerType * >( base ) ) return;
873
874 // Check if its a struct
875 StructInstType * baseStruct = dynamic_cast< StructInstType * >( base );
876 if( !baseStruct ) return;
877
878 // Check if its a monitor
879 if(baseStruct->baseStruct->is_monitor() || baseStruct->baseStruct->is_thread())
880 SemanticError( decl, "destructors for structures declared as \"monitor\" must use mutex parameters\n" );
881 }
882 return;
883 }
884
885 // Monitors can't be constructed with mutual exclusion
886 if( CodeGen::isConstructor(decl->name) && !first ) SemanticError( decl, "constructors cannot have mutex parameters" );
887
888 // It makes no sense to have multiple mutex parameters for the destructor
889 if( isDtor && mutexArgs.size() != 1 ) SemanticError( decl, "destructors can only have 1 mutex argument" );
890
891 // Make sure all the mutex arguments are monitors
892 for(auto arg : mutexArgs) {
893 validate( arg );
894 }
895
896 // Check if we need to instrument the body
897 CompoundStmt* body = decl->get_statements();
898 if( ! body ) return;
899
900 // Do we have the required headers
901 if( !monitor_decl || !guard_decl || !dtor_guard_decl )
902 SemanticError( decl, "mutex keyword requires monitors to be in scope, add #include <monitor.hfa>\n" );
903
904 // Instrument the body
905 if ( isDtor && isThread( mutexArgs.front() ) ) {
906 if( !thread_guard_decl ) {
907 SemanticError( decl, "thread destructor requires threads to be in scope, add #include <thread.hfa>\n" );
908 }
909 addThreadDtorStatements( decl, body, mutexArgs );
910 }
911 else if ( isDtor ) {
912 addDtorStatements( decl, body, mutexArgs );
913 }
914 else {
915 addStatements( decl, body, mutexArgs );
916 }
917 }
918
919 void MutexKeyword::postvisit(StructDecl* decl) {
920
921 if( decl->name == "monitor$" && decl->body ) {
922 assert( !monitor_decl );
923 monitor_decl = decl;
924 }
925 else if( decl->name == "monitor_guard_t" && decl->body ) {
926 assert( !guard_decl );
927 guard_decl = decl;
928 }
929 else if( decl->name == "monitor_dtor_guard_t" && decl->body ) {
930 assert( !dtor_guard_decl );
931 dtor_guard_decl = decl;
932 }
933 else if( decl->name == "thread_dtor_guard_t" && decl->body ) {
934 assert( !thread_guard_decl );
935 thread_guard_decl = decl;
936 }
937 }
938
939 std::list<DeclarationWithType*> MutexKeyword::findMutexArgs( FunctionDecl* decl, bool & first ) {
940 std::list<DeclarationWithType*> mutexArgs;
941
942 bool once = true;
943 for( auto arg : decl->get_functionType()->get_parameters()) {
944 //Find mutex arguments
945 Type* ty = arg->get_type();
946 if( ! ty->get_mutex() ) continue;
947
948 if(once) {first = true;}
949 once = false;
950
951 //Append it to the list
952 mutexArgs.push_back( arg );
953 }
954
955 return mutexArgs;
956 }
957
958 void MutexKeyword::validate( DeclarationWithType * arg ) {
959 Type* ty = arg->get_type();
960
961 //Makes sure it's not a copy
962 ReferenceType* rty = dynamic_cast< ReferenceType * >( ty );
963 if( ! rty ) SemanticError( arg, "Mutex argument must be of reference type " );
964
965 //Make sure the we are pointing directly to a type
966 Type* base = rty->get_base();
967 if( dynamic_cast< ReferenceType * >( base ) ) SemanticError( arg, "Mutex argument have exactly one level of indirection " );
968 if( dynamic_cast< PointerType * >( base ) ) SemanticError( arg, "Mutex argument have exactly one level of indirection " );
969
970 //Make sure that typed isn't mutex
971 if( base->get_mutex() ) SemanticError( arg, "mutex keyword may only appear once per argument " );
972 }
973
974 void MutexKeyword::addDtorStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args ) {
975 Type * arg_type = args.front()->get_type()->clone();
976 arg_type->set_mutex( false );
977
978 ObjectDecl * monitors = new ObjectDecl(
979 "__monitor",
980 noStorageClasses,
981 LinkageSpec::Cforall,
982 nullptr,
983 new PointerType(
984 noQualifiers,
985 new StructInstType(
986 noQualifiers,
987 monitor_decl
988 )
989 ),
990 new SingleInit( new UntypedExpr(
991 new NameExpr( "get_monitor" ),
992 { new CastExpr( new VariableExpr( args.front() ), arg_type, false ) }
993 ))
994 );
995
996 assert(generic_func);
997
998 //in reverse order :
999 // monitor_dtor_guard_t __guard = { __monitors, func };
1000 body->push_front(
1001 new DeclStmt( new ObjectDecl(
1002 "__guard",
1003 noStorageClasses,
1004 LinkageSpec::Cforall,
1005 nullptr,
1006 new StructInstType(
1007 noQualifiers,
1008 dtor_guard_decl
1009 ),
1010 new ListInit(
1011 {
1012 new SingleInit( new AddressExpr( new VariableExpr( monitors ) ) ),
1013 new SingleInit( new CastExpr( new VariableExpr( func ), generic_func->clone(), false ) ),
1014 new SingleInit( new ConstantExpr( Constant::from_bool( false ) ) )
1015 },
1016 noDesignators,
1017 true
1018 )
1019 ))
1020 );
1021
1022 //monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1023 body->push_front( new DeclStmt( monitors ) );
1024 }
1025
1026 void MutexKeyword::addThreadDtorStatements(
1027 FunctionDecl*, CompoundStmt * body,
1028 const std::list<DeclarationWithType * > & args ) {
1029 assert( args.size() == 1 );
1030 DeclarationWithType * arg = args.front();
1031 Type * arg_type = arg->get_type()->clone();
1032 assert( arg_type->get_mutex() );
1033 arg_type->set_mutex( false );
1034
1035 // thread_dtor_guard_t __guard = { this, intptr( 0 ) };
1036 body->push_front(
1037 new DeclStmt( new ObjectDecl(
1038 "__guard",
1039 noStorageClasses,
1040 LinkageSpec::Cforall,
1041 nullptr,
1042 new StructInstType(
1043 noQualifiers,
1044 thread_guard_decl
1045 ),
1046 new ListInit(
1047 {
1048 new SingleInit( new CastExpr( new VariableExpr( arg ), arg_type ) ),
1049 new SingleInit( new UntypedExpr(
1050 new NameExpr( "intptr" ), {
1051 new ConstantExpr( Constant::from_int( 0 ) ),
1052 }
1053 ) ),
1054 },
1055 noDesignators,
1056 true
1057 )
1058 ))
1059 );
1060 }
1061
1062 void MutexKeyword::addStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args ) {
1063 ObjectDecl * monitors = new ObjectDecl(
1064 "__monitors",
1065 noStorageClasses,
1066 LinkageSpec::Cforall,
1067 nullptr,
1068 new ArrayType(
1069 noQualifiers,
1070 new PointerType(
1071 noQualifiers,
1072 new StructInstType(
1073 noQualifiers,
1074 monitor_decl
1075 )
1076 ),
1077 new ConstantExpr( Constant::from_ulong( args.size() ) ),
1078 false,
1079 false
1080 ),
1081 new ListInit(
1082 map_range < std::list<Initializer*> > ( args, [](DeclarationWithType * var ){
1083 Type * type = var->get_type()->clone();
1084 type->set_mutex( false );
1085 return new SingleInit( new UntypedExpr(
1086 new NameExpr( "get_monitor" ),
1087 { new CastExpr( new VariableExpr( var ), type, false ) }
1088 ) );
1089 })
1090 )
1091 );
1092
1093 assert(generic_func);
1094
1095 // in reverse order :
1096 // monitor_guard_t __guard = { __monitors, #, func };
1097 body->push_front(
1098 new DeclStmt( new ObjectDecl(
1099 "__guard",
1100 noStorageClasses,
1101 LinkageSpec::Cforall,
1102 nullptr,
1103 new StructInstType(
1104 noQualifiers,
1105 guard_decl
1106 ),
1107 new ListInit(
1108 {
1109 new SingleInit( new VariableExpr( monitors ) ),
1110 new SingleInit( new ConstantExpr( Constant::from_ulong( args.size() ) ) ),
1111 new SingleInit( new CastExpr( new VariableExpr( func ), generic_func->clone(), false ) )
1112 },
1113 noDesignators,
1114 true
1115 )
1116 ))
1117 );
1118
1119 //monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1120 body->push_front( new DeclStmt( monitors) );
1121 }
1122
1123 //=============================================================================================
1124 // General entry routine
1125 //=============================================================================================
1126 void ThreadStarter::previsit( StructDecl * decl ) {
1127 if( decl->name == "thread$" && decl->body ) {
1128 assert( !thread_decl );
1129 thread_decl = decl;
1130 }
1131 }
1132
1133 void ThreadStarter::postvisit(FunctionDecl * decl) {
1134 if( ! CodeGen::isConstructor(decl->name) ) return;
1135
1136 Type * typeof_this = InitTweak::getTypeofThis(decl->type);
1137 StructInstType * ctored_type = dynamic_cast< StructInstType * >( typeof_this );
1138 if( ctored_type && ctored_type->baseStruct == thread_decl ) {
1139 thread_ctor_seen = true;
1140 }
1141
1142 DeclarationWithType * param = decl->get_functionType()->get_parameters().front();
1143 auto type = dynamic_cast< StructInstType * >( InitTweak::getPointerBase( param->get_type() ) );
1144 if( type && type->get_baseStruct()->is_thread() ) {
1145 if( !thread_decl || !thread_ctor_seen ) {
1146 SemanticError( type->get_baseStruct()->location, "thread keyword requires threads to be in scope, add #include <thread.hfa>");
1147 }
1148
1149 addStartStatement( decl, param );
1150 }
1151 }
1152
1153 void ThreadStarter::addStartStatement( FunctionDecl * decl, DeclarationWithType * param ) {
1154 CompoundStmt * stmt = decl->get_statements();
1155
1156 if( ! stmt ) return;
1157
1158 stmt->push_back(
1159 new ExprStmt(
1160 new UntypedExpr(
1161 new NameExpr( "__thrd_start" ),
1162 { new VariableExpr( param ), new NameExpr("main") }
1163 )
1164 )
1165 );
1166 }
1167};
1168
1169// Local Variables: //
1170// mode: c //
1171// tab-width: 4 //
1172// End: //
1173
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