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source: src/Concurrency/Waitfor.cc @ f739788

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Last change on this file since f739788 was ba3706f, checked in by Rob Schluntz <rschlunt@…>, 7 years ago
Remove label lists from various Statement constructors
Property mode set to `100644`
File size: 15.1 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	// Waitfor.cc --
8	//
9	// Author : Thierry Delisle
10	// Created On : Mon Aug 28 11:06:52 2017
11	// Last Modified By :
12	// Last Modified On :
13	// Update Count : 5
14	//
15
16	#include "Concurrency/Keywords.h"
17
18	#include <cassert> // for assert
19	#include <string> // for string, operator==
20
21	using namespace std::string_literals;
22
23	#include "Common/PassVisitor.h" // for PassVisitor
24	#include "Common/SemanticError.h" // for SemanticError
25	#include "Common/utility.h" // for deleteAll, map_range
26	#include "CodeGen/OperatorTable.h" // for isConstructor
27	#include "InitTweak/InitTweak.h" // for getPointerBase
28	#include "Parser/LinkageSpec.h" // for Cforall
29	#include "ResolvExpr/Resolver.h" // for findVoidExpression
30	#include "SynTree/Constant.h" // for Constant
31	#include "SynTree/Declaration.h" // for StructDecl, FunctionDecl, ObjectDecl
32	#include "SynTree/Expression.h" // for VariableExpr, ConstantExpr, Untype...
33	#include "SynTree/Initializer.h" // for SingleInit, ListInit, Initializer ...
34	#include "SynTree/Label.h" // for Label
35	#include "SynTree/Statement.h" // for CompoundStmt, DeclStmt, ExprStmt
36	#include "SynTree/Type.h" // for StructInstType, Type, PointerType
37	#include "SynTree/Visitor.h" // for Visitor, acceptAll
38
39	class Attribute;
40	/*
41	void foo() {
42	while( true ) {
43	when( a < 1 ) waitfor( f, a ) { bar(); }
44	or timeout( swagl() );
45	or waitfor( g, a ) { baz(); }
46	or waitfor( ^?{}, a ) { break; }
47	or waitfor( ^?{} ) { break; }
48	}
49	}
50
51	void f(int i, float f, A & mutex b, struct foo * );
52	void f(int );
53
54
55	\| \|
56	\| \|
57	\| \|
58	\| \|
59	\| \|
60	\ \| \| /
61	\ /
62	\ /
63	\/
64
65
66	void foo() {
67	while( true ) {
68
69	acceptable_t acceptables[3];
70	if( a < 1 ) {
71	acceptables[0].func = f;
72	acceptables[0].mon = a;
73	}
74	acceptables[1].func = g;
75	acceptables[1].mon = a;
76
77	acceptables[2].func = f;
78	acceptables[2].mon = a;
79	acceptables[2].is_dtor = true;
80
81	int ret = waitfor_internal( acceptables, swagl() );
82
83	switch( ret ) {
84	case 0:
85	{
86	bar();
87	}
88	case 1:
89	{
90	baz();
91	}
92	case 2:
93	signal(a);
94	{
95	break;
96	}
97	}
98	}
99	}*/
100
101	namespace Concurrency {
102	//=============================================================================================
103	// Pass declarations
104	//=============================================================================================
105
106	class GenerateWaitForPass final : public WithIndexer {
107	public:
108
109	void premutate( FunctionDecl * decl );
110	void premutate( StructDecl * decl );
111
112	Statement * postmutate( WaitForStmt * stmt );
113
114	static void generate( std::list< Declaration * > & translationUnit ) {
115	PassVisitor< GenerateWaitForPass > impl;
116	acceptAll( translationUnit, impl );
117	}
118
119	ObjectDecl * declare( unsigned long count, CompoundStmt * stmt );
120	ObjectDecl * declareFlag( CompoundStmt * stmt );
121	Statement * makeSetter( ObjectDecl * flag );
122	ObjectDecl * declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt );
123	void init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, Statement * settter, CompoundStmt * stmt );
124	Expression * init_timeout( Expression & time, Expression & time_cond, bool has_else, Expression & else_cond, Statement settter, CompoundStmt * stmt );
125	Expression * call(size_t count, ObjectDecl * acceptables, Expression * timeout, CompoundStmt * stmt);
126	void choose( WaitForStmt * waitfor, Expression * result, CompoundStmt * stmt );
127
128	static void implement( std::list< Declaration * > & translationUnit ) {
129	PassVisitor< GenerateWaitForPass > impl;
130	mutateAll( translationUnit, impl );
131	}
132
133
134	private:
135	FunctionDecl * decl_waitfor = nullptr;
136	StructDecl * decl_mask = nullptr;
137	StructDecl * decl_acceptable = nullptr;
138	StructDecl * decl_monitor = nullptr;
139
140	static std::unique_ptr< Type > generic_func;
141
142	UniqueName namer_acc = "__acceptables_"s;
143	UniqueName namer_idx = "__index_"s;
144	UniqueName namer_flg = "__do_run_"s;
145	UniqueName namer_msk = "__mask_"s;
146	UniqueName namer_mon = "__monitors_"s;
147	UniqueName namer_tim = "__timeout_"s;
148	};
149
150	//=============================================================================================
151	// General entry routine
152	//=============================================================================================
153	void generateWaitFor( std::list< Declaration * > & translationUnit ) {
154	GenerateWaitForPass ::implement( translationUnit );
155	}
156
157	//=============================================================================================
158	// Generic helper routine
159	//=============================================================================================
160
161	namespace {
162	Expression * makeOpIndex( DeclarationWithType * array, unsigned long index ) {
163	return new UntypedExpr(
164	new NameExpr( "?[?]" ),
165	{
166	new VariableExpr( array ),
167	new ConstantExpr( Constant::from_ulong( index ) )
168	}
169	);
170	}
171
172	Expression * makeOpAssign( Expression * lhs, Expression * rhs ) {
173	return new UntypedExpr(
174	new NameExpr( "?=?" ),
175	{ lhs, rhs }
176	);
177	}
178
179	Expression * makeOpMember( Expression * sue, const std::string & mem ) {
180	return new UntypedMemberExpr( new NameExpr( mem ), sue );
181	}
182
183	Statement * makeAccStatement( DeclarationWithType * object, unsigned long index, const std::string & member, Expression * value, const SymTab::Indexer & indexer ) {
184	Expression * expr = makeOpAssign(
185	makeOpMember(
186	makeOpIndex(
187	object,
188	index
189	),
190	member
191	),
192	value
193	);
194
195	ResolvExpr::findVoidExpression( expr, indexer );
196
197	return new ExprStmt( expr );
198	}
199
200	Expression * safeCond( Expression * expr, bool ifnull = true ) {
201	if( expr ) return expr;
202
203	return new ConstantExpr( Constant::from_bool( ifnull ) );
204	}
205
206	VariableExpr * extractVariable( Expression * func ) {
207	if( VariableExpr * var = dynamic_cast< VariableExpr * >( func ) ) {
208	return var;
209	}
210
211	CastExpr * cast = strict_dynamic_cast< CastExpr * >( func );
212	return strict_dynamic_cast< VariableExpr * >( cast->arg );
213	}
214
215	Expression * detectIsDtor( Expression * func ) {
216	VariableExpr * typed_func = extractVariable( func );
217	bool is_dtor = InitTweak::isDestructor( typed_func->var );
218	return new ConstantExpr( Constant::from_bool( is_dtor ) );
219	}
220	};
221
222
223	//=============================================================================================
224	// Generate waitfor implementation
225	//=============================================================================================
226
227	void GenerateWaitForPass::premutate( FunctionDecl * decl) {
228	if( decl->name != "__waitfor_internal" ) return;
229
230	decl_waitfor = decl;
231	}
232
233	void GenerateWaitForPass::premutate( StructDecl * decl ) {
234	if( ! decl->body ) return;
235
236	if( decl->name == "__acceptable_t" ) {
237	assert( !decl_acceptable );
238	decl_acceptable = decl;
239	}
240	else if( decl->name == "__waitfor_mask_t" ) {
241	assert( !decl_mask );
242	decl_mask = decl;
243	}
244	else if( decl->name == "monitor_desc" ) {
245	assert( !decl_monitor );
246	decl_monitor = decl;
247	}
248	}
249
250	Statement * GenerateWaitForPass::postmutate( WaitForStmt * waitfor ) {
251	if( !decl_monitor \|\| !decl_acceptable \|\| !decl_mask ) throw SemanticError( "waitfor keyword requires monitors to be in scope, add #include <monitor>", waitfor );
252
253	CompoundStmt * stmt = new CompoundStmt();
254
255	ObjectDecl * acceptables = declare( waitfor->clauses.size(), stmt );
256	ObjectDecl * flag = declareFlag( stmt );
257	Statement * setter = makeSetter( flag );
258
259	int index = 0;
260	for( auto & clause : waitfor->clauses ) {
261	init( acceptables, index, clause, setter, stmt );
262
263	index++;
264	}
265
266	Expression * timeout = init_timeout(
267	waitfor->timeout.time,
268	waitfor->timeout.condition,
269	waitfor->orelse .statement,
270	waitfor->orelse .condition,
271	setter,
272	stmt
273	);
274
275	CompoundStmt * compound = new CompoundStmt();
276	stmt->push_back( new IfStmt(
277	safeCond( new VariableExpr( flag ) ),
278	compound,
279	nullptr
280	));
281
282	Expression * result = call( waitfor->clauses.size(), acceptables, timeout, compound );
283
284	choose( waitfor, result, compound );
285
286	return stmt;
287	}
288
289	ObjectDecl * GenerateWaitForPass::declare( unsigned long count, CompoundStmt * stmt )
290	{
291	ObjectDecl * acceptables = ObjectDecl::newObject(
292	namer_acc.newName(),
293	new ArrayType(
294	noQualifiers,
295	new StructInstType(
296	noQualifiers,
297	decl_acceptable
298	),
299	new ConstantExpr( Constant::from_ulong( count ) ),
300	false,
301	false
302	),
303	nullptr
304	);
305
306	stmt->push_back( new DeclStmt( acceptables) );
307
308	Expression * set = new UntypedExpr(
309	new NameExpr( "__builtin_memset" ),
310	{
311	new VariableExpr( acceptables ),
312	new ConstantExpr( Constant::from_int( 0 ) ),
313	new SizeofExpr( new VariableExpr( acceptables ) )
314	}
315	);
316
317	ResolvExpr::findVoidExpression( set, indexer );
318
319	stmt->push_back( new ExprStmt( set ) );
320
321	return acceptables;
322	}
323
324	ObjectDecl * GenerateWaitForPass::declareFlag( CompoundStmt * stmt ) {
325	ObjectDecl * flag = ObjectDecl::newObject(
326	namer_flg.newName(),
327	new BasicType(
328	noQualifiers,
329	BasicType::Bool
330	),
331	new SingleInit( new ConstantExpr( Constant::from_ulong( 0 ) ) )
332	);
333
334	stmt->push_back( new DeclStmt( flag) );
335
336	return flag;
337	}
338
339	Statement * GenerateWaitForPass::makeSetter( ObjectDecl * flag ) {
340	Expression * expr = new UntypedExpr(
341	new NameExpr( "?=?" ),
342	{
343	new VariableExpr( flag ),
344	new ConstantExpr( Constant::from_ulong( 1 ) )
345	}
346	);
347
348	ResolvExpr::findVoidExpression( expr, indexer );
349
350	return new ExprStmt( expr );
351	}
352
353	ObjectDecl * GenerateWaitForPass::declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt ) {
354
355	ObjectDecl * mon = ObjectDecl::newObject(
356	namer_mon.newName(),
357	new ArrayType(
358	noQualifiers,
359	new PointerType(
360	noQualifiers,
361	new StructInstType(
362	noQualifiers,
363	decl_monitor
364	)
365	),
366	new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ),
367	false,
368	false
369	),
370	new ListInit(
371	map_range < std::list<Initializer> > ( clause.target.arguments, [this](Expression expr ){
372	Expression * init = new CastExpr(
373	new UntypedExpr(
374	new NameExpr( "get_monitor" ),
375	{ expr }
376	),
377	new PointerType(
378	noQualifiers,
379	new StructInstType(
380	noQualifiers,
381	decl_monitor
382	)
383	)
384	);
385
386	ResolvExpr::findSingleExpression( init, indexer );
387	return new SingleInit( init );
388	})
389	)
390	);
391
392	stmt->push_back( new DeclStmt( mon) );
393
394	return mon;
395	}
396
397	void GenerateWaitForPass::init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, Statement * setter, CompoundStmt * stmt ) {
398
399	ObjectDecl * monitors = declMon( clause, stmt );
400
401	Type * fptr_t = new PointerType( noQualifiers, new FunctionType( noQualifiers, true ) );
402
403	stmt->push_back( new IfStmt(
404	safeCond( clause.condition ),
405	new CompoundStmt({
406	makeAccStatement( acceptables, index, "is_dtor", detectIsDtor( clause.target.function ) , indexer ),
407	makeAccStatement( acceptables, index, "func" , new CastExpr( clause.target.function, fptr_t ) , indexer ),
408	makeAccStatement( acceptables, index, "data" , new VariableExpr( monitors ) , indexer ),
409	makeAccStatement( acceptables, index, "size" , new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ), indexer ),
410	setter->clone()
411	}),
412	nullptr
413	));
414
415	clause.target.function = nullptr;
416	clause.target.arguments.empty();
417	clause.condition = nullptr;
418	}
419
420	Expression * GenerateWaitForPass::init_timeout(
421	Expression *& time,
422	Expression *& time_cond,
423	bool has_else,
424	Expression *& else_cond,
425	Statement * setter,
426	CompoundStmt * stmt
427	) {
428	ObjectDecl * timeout = ObjectDecl::newObject(
429	namer_tim.newName(),
430	new BasicType(
431	noQualifiers,
432	BasicType::LongLongUnsignedInt
433	),
434	new SingleInit(
435	new ConstantExpr( Constant::from_int( -1 ) )
436	)
437	);
438
439	stmt->push_back( new DeclStmt( timeout ) );
440
441	if( time ) {
442	stmt->push_back( new IfStmt(
443	safeCond( time_cond ),
444	new CompoundStmt({
445	new ExprStmt(
446	makeOpAssign(
447	new VariableExpr( timeout ),
448	time
449	)
450	),
451	setter->clone()
452	}),
453	nullptr
454	));
455
456	time = time_cond = nullptr;
457	}
458
459	if( has_else ) {
460	stmt->push_back( new IfStmt(
461	safeCond( else_cond ),
462	new CompoundStmt({
463	new ExprStmt(
464	makeOpAssign(
465	new VariableExpr( timeout ),
466	new ConstantExpr( Constant::from_ulong( 0 ) )
467	)
468	),
469	setter->clone()
470	}),
471	nullptr
472	));
473
474	else_cond = nullptr;
475	}
476
477	delete setter;
478
479	return new VariableExpr( timeout );
480	}
481
482	Expression * GenerateWaitForPass::call(
483	size_t count,
484	ObjectDecl * acceptables,
485	Expression * timeout,
486	CompoundStmt * stmt
487	) {
488	ObjectDecl * index = ObjectDecl::newObject(
489	namer_idx.newName(),
490	new BasicType(
491	noQualifiers,
492	BasicType::ShortSignedInt
493	),
494	new SingleInit(
495	new ConstantExpr( Constant::from_int( -1 ) )
496	)
497	);
498
499	stmt->push_back( new DeclStmt( index ) );
500
501	ObjectDecl * mask = ObjectDecl::newObject(
502	namer_msk.newName(),
503	new StructInstType(
504	noQualifiers,
505	decl_mask
506	),
507	new ListInit({
508	new SingleInit( new AddressExpr( new VariableExpr( index ) ) ),
509	new SingleInit( new VariableExpr( acceptables ) ),
510	new SingleInit( new ConstantExpr( Constant::from_ulong( count ) ) )
511	})
512	);
513
514	stmt->push_back( new DeclStmt( mask ) );
515
516	stmt->push_back( new ExprStmt(
517	new ApplicationExpr(
518	VariableExpr::functionPointer( decl_waitfor ),
519	{
520	new CastExpr(
521	new VariableExpr( mask ),
522	new ReferenceType(
523	noQualifiers,
524	new StructInstType(
525	noQualifiers,
526	decl_mask
527	)
528	)
529	),
530	timeout
531	}
532	)
533	));
534
535	return new VariableExpr( index );
536	}
537
538	void GenerateWaitForPass::choose(
539	WaitForStmt * waitfor,
540	Expression * result,
541	CompoundStmt * stmt
542	) {
543	SwitchStmt * swtch = new SwitchStmt(
544	result,
545	std::list<Statement *>()
546	);
547
548	unsigned long i = 0;
549	for( auto & clause : waitfor->clauses ) {
550	swtch->statements.push_back(
551	new CaseStmt(
552	new ConstantExpr( Constant::from_ulong( i++ ) ),
553	{
554	clause.statement,
555	new BranchStmt(
556	"",
557	BranchStmt::Break
558	)
559	}
560	)
561	);
562	}
563
564	if(waitfor->timeout.statement) {
565	swtch->statements.push_back(
566	new CaseStmt(
567	new ConstantExpr( Constant::from_int( -2 ) ),
568	{
569	waitfor->timeout.statement,
570	new BranchStmt(
571	"",
572	BranchStmt::Break
573	)
574	}
575	)
576	);
577	}
578
579	if(waitfor->orelse.statement) {
580	swtch->statements.push_back(
581	new CaseStmt(
582	new ConstantExpr( Constant::from_int( -1 ) ),
583	{
584	waitfor->orelse.statement,
585	new BranchStmt(
586	"",
587	BranchStmt::Break
588	)
589	}
590	)
591	);
592	}
593
594	stmt->push_back( swtch );
595	}
596	};
597
598	// Local Variables: //
599	// mode: c //
600	// tab-width: 4 //
601	// End: //

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