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source: src/Concurrency/Keywords.cc@ 9f5a19fa

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ADT ast-experimental enum forall-pointer-decay jacob/cs343-translation pthread-emulation qualifiedEnum

Last change on this file since 9f5a19fa was 6cebfef, checked in by caparsons <caparson@…>, 4 years ago
added mutex stmt monitor
Property mode set to `100644`
File size: 38.1 KB

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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
41	class Attribute;
42
43	namespace 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	Statement * postmutate( MutexStmt * stmt );
305
306	std::list<DeclarationWithType> findMutexArgs( FunctionDecl, bool & first );
307	void validate( DeclarationWithType * );
308	void addDtorStatements( FunctionDecl* func, CompoundStmt , const std::list<DeclarationWithType > &);
309	void addStatements( FunctionDecl* func, CompoundStmt , const std::list<DeclarationWithType > &);
310	void addStatements( CompoundStmt * body, const std::list<Expression * > & args );
311	void addThreadDtorStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args );
312
313	static void implement( std::list< Declaration * > & translationUnit ) {
314	PassVisitor< MutexKeyword > impl;
315	acceptAll( translationUnit, impl );
316	mutateAll( translationUnit, impl );
317	}
318
319	private:
320	StructDecl* monitor_decl = nullptr;
321	StructDecl* guard_decl = nullptr;
322	StructDecl* dtor_guard_decl = nullptr;
323	StructDecl* thread_guard_decl = nullptr;
324
325	static std::unique_ptr< Type > generic_func;
326	};
327
328	std::unique_ptr< Type > MutexKeyword::generic_func = std::unique_ptr< Type >(
329	new FunctionType(
330	noQualifiers,
331	true
332	)
333	);
334
335	//-----------------------------------------------------------------------------
336	//Handles mutex routines definitions :
337	// void foo( A * mutex a, B * mutex b, int i ) { void foo( A * a, B * b, int i ) {
338	// monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
339	// monitor_guard_t __guard = { __monitors, 2 };
340	// /Some code/ => /Some code/
341	// } }
342	//
343	class ThreadStarter final {
344	public:
345
346	void postvisit( FunctionDecl * decl );
347	void previsit ( StructDecl * decl );
348
349	void addStartStatement( FunctionDecl * decl, DeclarationWithType * param );
350
351	static void implement( std::list< Declaration * > & translationUnit ) {
352	PassVisitor< ThreadStarter > impl;
353	acceptAll( translationUnit, impl );
354	}
355
356	private :
357	bool thread_ctor_seen = false;
358	StructDecl * thread_decl = nullptr;
359	};
360
361	//=============================================================================================
362	// General entry routine
363	//=============================================================================================
364	void applyKeywords( std::list< Declaration * > & translationUnit ) {
365	ThreadKeyword ::implement( translationUnit );
366	CoroutineKeyword ::implement( translationUnit );
367	MonitorKeyword ::implement( translationUnit );
368	GeneratorKeyword ::implement( translationUnit );
369	SuspendKeyword ::implement( translationUnit );
370	}
371
372	void implementMutexFuncs( std::list< Declaration * > & translationUnit ) {
373	MutexKeyword ::implement( translationUnit );
374	}
375
376	void implementThreadStarter( std::list< Declaration * > & translationUnit ) {
377	ThreadStarter ::implement( translationUnit );
378	}
379
380	//=============================================================================================
381	// Generic keyword implementation
382	//=============================================================================================
383	void fixupGenerics(FunctionType * func, StructDecl * decl) {
384	cloneAll(decl->parameters, func->forall);
385	for ( TypeDecl * td : func->forall ) {
386	strict_dynamic_cast<StructInstType*>(
387	func->parameters.front()->get_type()->stripReferences()
388	)->parameters.push_back(
389	new TypeExpr( new TypeInstType( noQualifiers, td->name, td ) )
390	);
391	}
392	}
393
394	Declaration * ConcurrentSueKeyword::postmutate(StructDecl * decl) {
395	if( decl->name == type_name && decl->body ) {
396	assert( !type_decl );
397	type_decl = decl;
398	}
399	else if ( is_target(decl) ) {
400	handle( decl );
401	}
402	else if ( !except_decl && exception_name == decl->name && decl->body ) {
403	except_decl = decl;
404	}
405	else if ( !typeid_decl && typeid_name == decl->name && decl->body ) {
406	typeid_decl = decl;
407	}
408	else if ( !vtable_decl && vtable_name == decl->name && decl->body ) {
409	vtable_decl = decl;
410	}
411	// Might be able to get ride of is target.
412	assert( is_target(decl) == (cast_target == decl->kind) );
413	return decl;
414	}
415
416	DeclarationWithType * ConcurrentSueKeyword::postmutate( FunctionDecl * decl ) {
417	if ( type_decl && isDestructorFor( decl, type_decl ) )
418	dtor_decl = decl;
419	else if ( vtable_name.empty() \|\| !decl->has_body() )
420	;
421	else if ( auto param = isMainFor( decl, cast_target ) ) {
422	// This should never trigger.
423	assert( vtable_decl );
424	// Should be safe because of isMainFor.
425	StructInstType * struct_type = static_cast<StructInstType *>(
426	static_cast<ReferenceType *>( param->get_type() )->base );
427	assert( struct_type );
428
429	std::list< Expression * > poly_args = { new TypeExpr( struct_type->clone() ) };
430	ObjectDecl * vtable_object = Virtual::makeVtableInstance(
431	"_default_vtable_object_declaration",
432	vtable_decl->makeInst( poly_args ), struct_type, nullptr );
433	declsToAddAfter.push_back( vtable_object );
434	declsToAddAfter.push_back(
435	new ObjectDecl(
436	Virtual::concurrentDefaultVTableName(),
437	noStorageClasses,
438	LinkageSpec::Cforall,
439	/* bitfieldWidth */ nullptr,
440	new ReferenceType( Type::Const, vtable_object->type->clone() ),
441	new SingleInit( new VariableExpr( vtable_object ) )
442	)
443	);
444	declsToAddAfter.push_back( Virtual::makeGetExceptionFunction(
445	vtable_object, except_decl->makeInst( std::move( poly_args ) )
446	) );
447	}
448
449	return decl;
450	}
451
452	Expression * ConcurrentSueKeyword::postmutate( KeywordCastExpr * cast ) {
453	if ( cast_target == cast->target ) {
454	// convert (thread &)t to (thread$ &)*get_thread(t), etc.
455	if( !type_decl ) SemanticError( cast, context_error );
456	if( !dtor_decl ) SemanticError( cast, context_error );
457	assert( cast->result == nullptr );
458	cast->set_result( new ReferenceType( noQualifiers, new StructInstType( noQualifiers, type_decl ) ) );
459	cast->concrete_target.field = field_name;
460	cast->concrete_target.getter = getter_name;
461	}
462	return cast;
463	}
464
465
466	void ConcurrentSueKeyword::handle( StructDecl * decl ) {
467	if( ! decl->body ) return;
468
469	if( !type_decl ) SemanticError( decl, context_error );
470	if( !dtor_decl ) SemanticError( decl, context_error );
471
472	if ( !exception_name.empty() ) {
473	if( !typeid_decl ) SemanticError( decl, context_error );
474	if( !vtable_decl ) SemanticError( decl, context_error );
475
476	addTypeId( decl );
477	addVtableForward( decl );
478	}
479	FunctionDecl * func = forwardDeclare( decl );
480	ObjectDecl * field = addField( decl );
481	addRoutines( field, func );
482	}
483
484	void ConcurrentSueKeyword::addTypeId( StructDecl * decl ) {
485	assert( typeid_decl );
486	StructInstType typeid_type( Type::Const, typeid_decl );
487	typeid_type.parameters.push_back( new TypeExpr(
488	new StructInstType( noQualifiers, decl )
489	) );
490	declsToAddBefore.push_back( Virtual::makeTypeIdInstance( &typeid_type ) );
491	}
492
493	void ConcurrentSueKeyword::addVtableForward( StructDecl * decl ) {
494	assert( vtable_decl );
495	std::list< Expression * > poly_args = {
496	new TypeExpr( new StructInstType( noQualifiers, decl ) ),
497	};
498	declsToAddBefore.push_back( Virtual::makeGetExceptionForward(
499	vtable_decl->makeInst( poly_args ),
500	except_decl->makeInst( poly_args )
501	) );
502	ObjectDecl * vtable_object = Virtual::makeVtableForward(
503	"_default_vtable_object_declaration",
504	vtable_decl->makeInst( move( poly_args ) ) );
505	declsToAddBefore.push_back( vtable_object );
506	declsToAddBefore.push_back(
507	new ObjectDecl(
508	Virtual::concurrentDefaultVTableName(),
509	Type::StorageClasses( Type::Extern ),
510	LinkageSpec::Cforall,
511	/* bitfieldWidth */ nullptr,
512	new ReferenceType( Type::Const, vtable_object->type->clone() ),
513	/* init */ nullptr
514	)
515	);
516	}
517
518	FunctionDecl * ConcurrentSueKeyword::forwardDeclare( StructDecl * decl ) {
519
520	StructDecl * forward = decl->clone();
521	forward->set_body( false );
522	deleteAll( forward->get_members() );
523	forward->get_members().clear();
524
525	FunctionType * get_type = new FunctionType( noQualifiers, false );
526	ObjectDecl * this_decl = new ObjectDecl(
527	"this",
528	noStorageClasses,
529	LinkageSpec::Cforall,
530	nullptr,
531	new ReferenceType(
532	noQualifiers,
533	new StructInstType(
534	noQualifiers,
535	decl
536	)
537	),
538	nullptr
539	);
540
541	get_type->get_parameters().push_back( this_decl->clone() );
542	get_type->get_returnVals().push_back(
543	new ObjectDecl(
544	"ret",
545	noStorageClasses,
546	LinkageSpec::Cforall,
547	nullptr,
548	new PointerType(
549	noQualifiers,
550	new StructInstType(
551	noQualifiers,
552	type_decl
553	)
554	),
555	nullptr
556	)
557	);
558	fixupGenerics(get_type, decl);
559
560	FunctionDecl * get_decl = new FunctionDecl(
561	getter_name,
562	Type::Static,
563	LinkageSpec::Cforall,
564	get_type,
565	nullptr,
566	{ new Attribute("const") },
567	Type::Inline
568	);
569
570	FunctionDecl * main_decl = nullptr;
571
572	if( needs_main ) {
573	FunctionType * main_type = new FunctionType( noQualifiers, false );
574
575	main_type->get_parameters().push_back( this_decl->clone() );
576
577	main_decl = new FunctionDecl(
578	"main",
579	noStorageClasses,
580	LinkageSpec::Cforall,
581	main_type,
582	nullptr
583	);
584	fixupGenerics(main_type, decl);
585	}
586
587	delete this_decl;
588
589	declsToAddBefore.push_back( forward );
590	if( needs_main ) declsToAddBefore.push_back( main_decl );
591	declsToAddBefore.push_back( get_decl );
592
593	return get_decl;
594	}
595
596	ObjectDecl * ConcurrentSueKeyword::addField( StructDecl * decl ) {
597	ObjectDecl * field = new ObjectDecl(
598	field_name,
599	noStorageClasses,
600	LinkageSpec::Cforall,
601	nullptr,
602	new StructInstType(
603	noQualifiers,
604	type_decl
605	),
606	nullptr
607	);
608
609	decl->get_members().push_back( field );
610
611	return field;
612	}
613
614	void ConcurrentSueKeyword::addRoutines( ObjectDecl * field, FunctionDecl * func ) {
615	CompoundStmt * statement = new CompoundStmt();
616	statement->push_back(
617	new ReturnStmt(
618	new AddressExpr(
619	new MemberExpr(
620	field,
621	new CastExpr(
622	new VariableExpr( func->get_functionType()->get_parameters().front() ),
623	func->get_functionType()->get_parameters().front()->get_type()->stripReferences()->clone(),
624	false
625	)
626	)
627	)
628	)
629	);
630
631	FunctionDecl * get_decl = func->clone();
632
633	get_decl->set_statements( statement );
634
635	declsToAddAfter.push_back( get_decl );
636	}
637
638	//=============================================================================================
639	// Suspend keyword implementation
640	//=============================================================================================
641	bool SuspendKeyword::is_real_suspend( FunctionDecl * func ) {
642	if(isMangled(func->linkage)) return false; // the real suspend isn't mangled
643	if(func->name != "__cfactx_suspend") return false; // the real suspend has a specific name
644	if(func->type->parameters.size() != 0) return false; // Too many parameters
645	if(func->type->returnVals.size() != 0) return false; // Too many return values
646
647	return true;
648	}
649
650	void SuspendKeyword::premutate( FunctionDecl * func ) {
651	GuardValue(in_generator);
652	in_generator = nullptr;
653
654	// Is this the real suspend?
655	if(is_real_suspend(func)) {
656	decl_suspend = decl_suspend ? decl_suspend : func;
657	return;
658	}
659
660	// Is this the main of a generator?
661	auto param = isMainFor( func, AggregateDecl::Aggregate::Generator );
662	if(!param) return;
663
664	if(func->type->returnVals.size() != 0) SemanticError(func->location, "Generator main must return void");
665
666	in_generator = param;
667	GuardValue(labels);
668	labels.clear();
669	}
670
671	DeclarationWithType * SuspendKeyword::postmutate( FunctionDecl * func ) {
672	if( !func->statements ) return func; // Not the actual definition, don't do anything
673	if( !in_generator ) return func; // Not in a generator, don't do anything
674	if( labels.empty() ) return func; // Generator has no states, nothing to do, could throw a warning
675
676	// This is a generator main, we need to add the following code to the top
677	// static void * __generator_labels[] = {&&s0, &&s1, ...};
678	// goto * __generator_labels[gen.__generator_state];
679	const auto & loc = func->location;
680
681	const auto first_label = gen.newLabel("generator");
682
683	// for each label add to declaration
684	std::list<Initializer*> inits = { new SingleInit( new LabelAddressExpr( first_label ) ) };
685	for(const auto & label : labels) {
686	inits.push_back(
687	new SingleInit(
688	new LabelAddressExpr( label )
689	)
690	);
691	}
692	auto init = new ListInit(std::move(inits), noDesignators, true);
693	labels.clear();
694
695	// create decl
696	auto decl = new ObjectDecl(
697	"__generator_labels",
698	Type::StorageClasses( Type::Static ),
699	LinkageSpec::AutoGen,
700	nullptr,
701	new ArrayType(
702	Type::Qualifiers(),
703	new PointerType(
704	Type::Qualifiers(),
705	new VoidType( Type::Qualifiers() )
706	),
707	nullptr,
708	false, false
709	),
710	init
711	);
712
713	// create the goto
714	assert(in_generator);
715
716	auto go_decl = new ObjectDecl(
717	"__generator_label",
718	noStorageClasses,
719	LinkageSpec::AutoGen,
720	nullptr,
721	new PointerType(
722	Type::Qualifiers(),
723	new VoidType( Type::Qualifiers() )
724	),
725	new SingleInit(
726	new UntypedExpr(
727	new NameExpr("?[?]"),
728	{
729	new NameExpr("__generator_labels"),
730	new UntypedMemberExpr(
731	new NameExpr("__generator_state"),
732	new VariableExpr( in_generator )
733	)
734	}
735	)
736	)
737	);
738	go_decl->location = loc;
739
740	auto go = new BranchStmt(
741	new VariableExpr( go_decl ),
742	BranchStmt::Goto
743	);
744	go->location = loc;
745	go->computedTarget->location = loc;
746
747	auto noop = new NullStmt({ first_label });
748	noop->location = loc;
749
750	// wrap everything in a nice compound
751	auto body = new CompoundStmt({
752	new DeclStmt( decl ),
753	new DeclStmt( go_decl ),
754	go,
755	noop,
756	func->statements
757	});
758	body->location = loc;
759	func->statements = body;
760
761	return func;
762	}
763
764	Statement * SuspendKeyword::postmutate( SuspendStmt * stmt ) {
765	SuspendStmt::Type type = stmt->type;
766	if(type == SuspendStmt::None) {
767	// This suspend has a implicit target, find it
768	type = in_generator ? SuspendStmt::Generator : SuspendStmt::Coroutine;
769	}
770
771	// Check that the target makes sense
772	if(!in_generator && type == SuspendStmt::Generator) SemanticError( stmt->location, "'suspend generator' must be used inside main of generator type.");
773
774	// Act appropriately
775	switch(type) {
776	case SuspendStmt::Generator: return make_generator_suspend(stmt);
777	case SuspendStmt::Coroutine: return make_coroutine_suspend(stmt);
778	default: abort();
779	}
780	}
781
782	Statement * SuspendKeyword::make_generator_suspend( SuspendStmt * stmt ) {
783	assert(in_generator);
784	// Target code is :
785	// gen.__generator_state = X;
786	// { THEN }
787	// return;
788	// __gen_X:;
789
790	// Save the location and delete the old statement, we only need the location from this point on
791	auto loc = stmt->location;
792
793	// Build the label and get its index
794	auto label = make_label();
795
796	// Create the context saving statement
797	auto save = new ExprStmt( new UntypedExpr(
798	new NameExpr( "?=?" ),
799	{
800	new UntypedMemberExpr(
801	new NameExpr("__generator_state"),
802	new VariableExpr( in_generator )
803	),
804	new ConstantExpr(
805	Constant::from_int( label.idx )
806	)
807	}
808	));
809	assert(save->expr);
810	save->location = loc;
811	stmtsToAddBefore.push_back( save );
812
813	// if we have a then add it here
814	auto then = stmt->then;
815	stmt->then = nullptr;
816	delete stmt;
817	if(then) stmtsToAddBefore.push_back( then );
818
819	// Create the return statement
820	auto ret = new ReturnStmt( nullptr );
821	ret->location = loc;
822	stmtsToAddBefore.push_back( ret );
823
824	// Create the null statement with the created label
825	auto noop = new NullStmt({ label.obj });
826	noop->location = loc;
827
828	// Return the null statement to take the place of the previous statement
829	return noop;
830	}
831
832	Statement * SuspendKeyword::make_coroutine_suspend( SuspendStmt * stmt ) {
833	if(stmt->then) SemanticError( stmt->location, "Compound statement following coroutines is not implemented.");
834
835	// Save the location and delete the old statement, we only need the location from this point on
836	auto loc = stmt->location;
837	delete stmt;
838
839	// Create the call expression
840	if(!decl_suspend) SemanticError( loc, "suspend keyword applied to coroutines requires coroutines to be in scope, add #include <coroutine.hfa>\n");
841	auto expr = new UntypedExpr( VariableExpr::functionPointer( decl_suspend ) );
842	expr->location = loc;
843
844	// Change this statement into a regular expr
845	assert(expr);
846	auto nstmt = new ExprStmt( expr );
847	nstmt->location = loc;
848	return nstmt;
849	}
850
851
852	//=============================================================================================
853	// Mutex keyword implementation
854	//=============================================================================================
855
856	void MutexKeyword::postvisit(FunctionDecl* decl) {
857
858	bool first = false;
859	std::list<DeclarationWithType*> mutexArgs = findMutexArgs( decl, first );
860	bool const isDtor = CodeGen::isDestructor( decl->name );
861
862	// Is this function relevant to monitors
863	if( mutexArgs.empty() ) {
864	// If this is the destructor for a monitor it must be mutex
865	if(isDtor) {
866	Type* ty = decl->get_functionType()->get_parameters().front()->get_type();
867
868	// If it's a copy, it's not a mutex
869	ReferenceType* rty = dynamic_cast< ReferenceType * >( ty );
870	if( ! rty ) return;
871
872	// If we are not pointing directly to a type, it's not a mutex
873	Type* base = rty->get_base();
874	if( dynamic_cast< ReferenceType * >( base ) ) return;
875	if( dynamic_cast< PointerType * >( base ) ) return;
876
877	// Check if its a struct
878	StructInstType * baseStruct = dynamic_cast< StructInstType * >( base );
879	if( !baseStruct ) return;
880
881	// Check if its a monitor
882	if(baseStruct->baseStruct->is_monitor() \|\| baseStruct->baseStruct->is_thread())
883	SemanticError( decl, "destructors for structures declared as \"monitor\" must use mutex parameters\n" );
884	}
885	return;
886	}
887
888	// Monitors can't be constructed with mutual exclusion
889	if( CodeGen::isConstructor(decl->name) && !first ) SemanticError( decl, "constructors cannot have mutex parameters" );
890
891	// It makes no sense to have multiple mutex parameters for the destructor
892	if( isDtor && mutexArgs.size() != 1 ) SemanticError( decl, "destructors can only have 1 mutex argument" );
893
894	// Make sure all the mutex arguments are monitors
895	for(auto arg : mutexArgs) {
896	validate( arg );
897	}
898
899	// Check if we need to instrument the body
900	CompoundStmt* body = decl->get_statements();
901	if( ! body ) return;
902
903	// Do we have the required headers
904	if( !monitor_decl \|\| !guard_decl \|\| !dtor_guard_decl )
905	SemanticError( decl, "mutex keyword requires monitors to be in scope, add #include <monitor.hfa>\n" );
906
907	// Instrument the body
908	if ( isDtor && isThread( mutexArgs.front() ) ) {
909	if( !thread_guard_decl ) {
910	SemanticError( decl, "thread destructor requires threads to be in scope, add #include <thread.hfa>\n" );
911	}
912	addThreadDtorStatements( decl, body, mutexArgs );
913	}
914	else if ( isDtor ) {
915	addDtorStatements( decl, body, mutexArgs );
916	}
917	else {
918	addStatements( decl, body, mutexArgs );
919	}
920	}
921
922	void MutexKeyword::postvisit(StructDecl* decl) {
923
924	if( decl->name == "monitor$" && decl->body ) {
925	assert( !monitor_decl );
926	monitor_decl = decl;
927	}
928	else if( decl->name == "monitor_guard_t" && decl->body ) {
929	assert( !guard_decl );
930	guard_decl = decl;
931	}
932	else if( decl->name == "monitor_dtor_guard_t" && decl->body ) {
933	assert( !dtor_guard_decl );
934	dtor_guard_decl = decl;
935	}
936	else if( decl->name == "thread_dtor_guard_t" && decl->body ) {
937	assert( !thread_guard_decl );
938	thread_guard_decl = decl;
939	}
940	}
941
942	Statement * MutexKeyword::postmutate( MutexStmt * stmt ) {
943	std::list<Statement *> stmtsForCtor;
944	stmtsForCtor.push_back(stmt->stmt);
945	CompoundStmt * body = new CompoundStmt( stmtsForCtor );
946	addStatements( body, stmt->mutexObjs);
947	return body;
948	}
949
950	std::list<DeclarationWithType> MutexKeyword::findMutexArgs( FunctionDecl decl, bool & first ) {
951	std::list<DeclarationWithType*> mutexArgs;
952
953	bool once = true;
954	for( auto arg : decl->get_functionType()->get_parameters()) {
955	//Find mutex arguments
956	Type* ty = arg->get_type();
957	if( ! ty->get_mutex() ) continue;
958
959	if(once) {first = true;}
960	once = false;
961
962	//Append it to the list
963	mutexArgs.push_back( arg );
964	}
965
966	return mutexArgs;
967	}
968
969	void MutexKeyword::validate( DeclarationWithType * arg ) {
970	Type* ty = arg->get_type();
971
972	//Makes sure it's not a copy
973	ReferenceType* rty = dynamic_cast< ReferenceType * >( ty );
974	if( ! rty ) SemanticError( arg, "Mutex argument must be of reference type " );
975
976	//Make sure the we are pointing directly to a type
977	Type* base = rty->get_base();
978	if( dynamic_cast< ReferenceType * >( base ) ) SemanticError( arg, "Mutex argument have exactly one level of indirection " );
979	if( dynamic_cast< PointerType * >( base ) ) SemanticError( arg, "Mutex argument have exactly one level of indirection " );
980
981	//Make sure that typed isn't mutex
982	if( base->get_mutex() ) SemanticError( arg, "mutex keyword may only appear once per argument " );
983	}
984
985	void MutexKeyword::addDtorStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args ) {
986	Type * arg_type = args.front()->get_type()->clone();
987	arg_type->set_mutex( false );
988
989	ObjectDecl * monitors = new ObjectDecl(
990	"__monitor",
991	noStorageClasses,
992	LinkageSpec::Cforall,
993	nullptr,
994	new PointerType(
995	noQualifiers,
996	new StructInstType(
997	noQualifiers,
998	monitor_decl
999	)
1000	),
1001	new SingleInit( new UntypedExpr(
1002	new NameExpr( "get_monitor" ),
1003	{ new CastExpr( new VariableExpr( args.front() ), arg_type, false ) }
1004	))
1005	);
1006
1007	assert(generic_func);
1008
1009	//in reverse order :
1010	// monitor_dtor_guard_t __guard = { __monitors, func };
1011	body->push_front(
1012	new DeclStmt( new ObjectDecl(
1013	"__guard",
1014	noStorageClasses,
1015	LinkageSpec::Cforall,
1016	nullptr,
1017	new StructInstType(
1018	noQualifiers,
1019	dtor_guard_decl
1020	),
1021	new ListInit(
1022	{
1023	new SingleInit( new AddressExpr( new VariableExpr( monitors ) ) ),
1024	new SingleInit( new CastExpr( new VariableExpr( func ), generic_func->clone(), false ) ),
1025	new SingleInit( new ConstantExpr( Constant::from_bool( false ) ) )
1026	},
1027	noDesignators,
1028	true
1029	)
1030	))
1031	);
1032
1033	//monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1034	body->push_front( new DeclStmt( monitors ) );
1035	}
1036
1037	void MutexKeyword::addThreadDtorStatements(
1038	FunctionDecl, CompoundStmt body,
1039	const std::list<DeclarationWithType * > & args ) {
1040	assert( args.size() == 1 );
1041	DeclarationWithType * arg = args.front();
1042	Type * arg_type = arg->get_type()->clone();
1043	assert( arg_type->get_mutex() );
1044	arg_type->set_mutex( false );
1045
1046	// thread_dtor_guard_t __guard = { this, intptr( 0 ) };
1047	body->push_front(
1048	new DeclStmt( new ObjectDecl(
1049	"__guard",
1050	noStorageClasses,
1051	LinkageSpec::Cforall,
1052	nullptr,
1053	new StructInstType(
1054	noQualifiers,
1055	thread_guard_decl
1056	),
1057	new ListInit(
1058	{
1059	new SingleInit( new CastExpr( new VariableExpr( arg ), arg_type ) ),
1060	new SingleInit( new UntypedExpr(
1061	new NameExpr( "intptr" ), {
1062	new ConstantExpr( Constant::from_int( 0 ) ),
1063	}
1064	) ),
1065	},
1066	noDesignators,
1067	true
1068	)
1069	))
1070	);
1071	}
1072
1073	void MutexKeyword::addStatements( CompoundStmt * body, const std::list<Expression * > & args ) {
1074	ObjectDecl * monitors = new ObjectDecl(
1075	"__monitors",
1076	noStorageClasses,
1077	LinkageSpec::Cforall,
1078	nullptr,
1079	new ArrayType(
1080	noQualifiers,
1081	new PointerType(
1082	noQualifiers,
1083	new StructInstType(
1084	noQualifiers,
1085	monitor_decl
1086	)
1087	),
1088	new ConstantExpr( Constant::from_ulong( args.size() ) ),
1089	false,
1090	false
1091	),
1092	new ListInit(
1093	map_range < std::list<Initializer> > ( args, [](Expression var ){
1094	return new SingleInit( new UntypedExpr(
1095	new NameExpr( "get_monitor" ),
1096	{ var }
1097	) );
1098	})
1099	)
1100	);
1101
1102	// in reverse order :
1103	// monitor_guard_t __guard = { __monitors, # };
1104	body->push_front(
1105	new DeclStmt( new ObjectDecl(
1106	"__guard",
1107	noStorageClasses,
1108	LinkageSpec::Cforall,
1109	nullptr,
1110	new StructInstType(
1111	noQualifiers,
1112	guard_decl
1113	),
1114	new ListInit(
1115	{
1116	new SingleInit( new VariableExpr( monitors ) ),
1117	new SingleInit( new ConstantExpr( Constant::from_ulong( args.size() ) ) )
1118	},
1119	noDesignators,
1120	true
1121	)
1122	))
1123	);
1124
1125	//monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1126	body->push_front( new DeclStmt( monitors) );
1127	}
1128
1129	void MutexKeyword::addStatements( FunctionDecl* func, CompoundStmt * body, const std::list<DeclarationWithType * > & args ) {
1130	ObjectDecl * monitors = new ObjectDecl(
1131	"__monitors",
1132	noStorageClasses,
1133	LinkageSpec::Cforall,
1134	nullptr,
1135	new ArrayType(
1136	noQualifiers,
1137	new PointerType(
1138	noQualifiers,
1139	new StructInstType(
1140	noQualifiers,
1141	monitor_decl
1142	)
1143	),
1144	new ConstantExpr( Constant::from_ulong( args.size() ) ),
1145	false,
1146	false
1147	),
1148	new ListInit(
1149	map_range < std::list<Initializer> > ( args, [](DeclarationWithType var ){
1150	Type * type = var->get_type()->clone();
1151	type->set_mutex( false );
1152	return new SingleInit( new UntypedExpr(
1153	new NameExpr( "get_monitor" ),
1154	{ new CastExpr( new VariableExpr( var ), type, false ) }
1155	) );
1156	})
1157	)
1158	);
1159
1160	assert(generic_func);
1161
1162	// in reverse order :
1163	// monitor_guard_t __guard = { __monitors, #, func };
1164	body->push_front(
1165	new DeclStmt( new ObjectDecl(
1166	"__guard",
1167	noStorageClasses,
1168	LinkageSpec::Cforall,
1169	nullptr,
1170	new StructInstType(
1171	noQualifiers,
1172	guard_decl
1173	),
1174	new ListInit(
1175	{
1176	new SingleInit( new VariableExpr( monitors ) ),
1177	new SingleInit( new ConstantExpr( Constant::from_ulong( args.size() ) ) ),
1178	new SingleInit( new CastExpr( new VariableExpr( func ), generic_func->clone(), false ) )
1179	},
1180	noDesignators,
1181	true
1182	)
1183	))
1184	);
1185
1186	//monitor$ * __monitors[] = { get_monitor(a), get_monitor(b) };
1187	body->push_front( new DeclStmt( monitors) );
1188	}
1189
1190	//=============================================================================================
1191	// General entry routine
1192	//=============================================================================================
1193	void ThreadStarter::previsit( StructDecl * decl ) {
1194	if( decl->name == "thread$" && decl->body ) {
1195	assert( !thread_decl );
1196	thread_decl = decl;
1197	}
1198	}
1199
1200	void ThreadStarter::postvisit(FunctionDecl * decl) {
1201	if( ! CodeGen::isConstructor(decl->name) ) return;
1202
1203	Type * typeof_this = InitTweak::getTypeofThis(decl->type);
1204	StructInstType * ctored_type = dynamic_cast< StructInstType * >( typeof_this );
1205	if( ctored_type && ctored_type->baseStruct == thread_decl ) {
1206	thread_ctor_seen = true;
1207	}
1208
1209	DeclarationWithType * param = decl->get_functionType()->get_parameters().front();
1210	auto type = dynamic_cast< StructInstType * >( InitTweak::getPointerBase( param->get_type() ) );
1211	if( type && type->get_baseStruct()->is_thread() ) {
1212	if( !thread_decl \|\| !thread_ctor_seen ) {
1213	SemanticError( type->get_baseStruct()->location, "thread keyword requires threads to be in scope, add #include <thread.hfa>");
1214	}
1215
1216	addStartStatement( decl, param );
1217	}
1218	}
1219
1220	void ThreadStarter::addStartStatement( FunctionDecl * decl, DeclarationWithType * param ) {
1221	CompoundStmt * stmt = decl->get_statements();
1222
1223	if( ! stmt ) return;
1224
1225	stmt->push_back(
1226	new ExprStmt(
1227	new UntypedExpr(
1228	new NameExpr( "__thrd_start" ),
1229	{ new VariableExpr( param ), new NameExpr("main") }
1230	)
1231	)
1232	);
1233	}
1234	};
1235
1236	// Local Variables: //
1237	// mode: c //
1238	// tab-width: 4 //
1239	// End: //
1240

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