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source: src/Concurrency/Waitfor.cc @ 1dcd9554

ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc

Last change on this file since 1dcd9554 was 1dcd9554, checked in by Thierry Delisle <tdelisle@…>, 7 years ago
First "working" implementation of waitfor
Property mode set to `100644`
File size: 12.4 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	namespace {
104	const std::list<Label> noLabels;
105	const std::list< Attribute * > noAttributes;
106	Type::StorageClasses noStorage;
107	Type::Qualifiers noQualifiers;
108	}
109
110	//=============================================================================================
111	// Pass declarations
112	//=============================================================================================
113
114	class GenerateWaitForPass final : public WithIndexer {
115	public:
116
117	void premutate( FunctionDecl * decl );
118	void premutate( StructDecl * decl );
119
120	Statement * postmutate( WaitForStmt * stmt );
121
122	static void generate( std::list< Declaration * > & translationUnit ) {
123	PassVisitor< GenerateWaitForPass > impl;
124	acceptAll( translationUnit, impl );
125	}
126
127	ObjectDecl * declare( unsigned long count, CompoundStmt * stmt );
128	ObjectDecl * declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt );
129	void init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, CompoundStmt * stmt );
130	Expression * init_timeout( Expression & time, Expression & time_cond, bool has_else, Expression & else_cond, CompoundStmt stmt );
131	Expression * call(size_t count, ObjectDecl * acceptables, Expression * timeout, CompoundStmt * stmt);
132	void choose( WaitForStmt * waitfor, Expression * result, CompoundStmt * stmt );
133
134	static void implement( std::list< Declaration * > & translationUnit ) {
135	PassVisitor< GenerateWaitForPass > impl;
136	mutateAll( translationUnit, impl );
137	}
138
139
140	private:
141	FunctionDecl * decl_waitfor = nullptr;
142	StructDecl * decl_acceptable = nullptr;
143	StructDecl * decl_monitor = nullptr;
144
145	static std::unique_ptr< Type > generic_func;
146
147	UniqueName namer_mon = "__monitors_"s;
148	UniqueName namer_acc = "__acceptables_"s;
149	UniqueName namer_tim = "__timeout_"s;
150	UniqueName namer_ret = "__return_"s;
151	};
152
153	//=============================================================================================
154	// General entry routine
155	//=============================================================================================
156	void generateWaitFor( std::list< Declaration * > & translationUnit ) {
157	GenerateWaitForPass ::implement( translationUnit );
158	}
159
160	//=============================================================================================
161	// Generic helper routine
162	//=============================================================================================
163
164	namespace {
165	Expression * makeOpIndex( DeclarationWithType * array, unsigned long index ) {
166	return new UntypedExpr(
167	new NameExpr( "?[?]" ),
168	{
169	new VariableExpr( array ),
170	new ConstantExpr( Constant::from_ulong( index ) )
171	}
172	);
173	}
174
175	Expression * makeOpAssign( Expression * lhs, Expression * rhs ) {
176	return new UntypedExpr(
177	new NameExpr( "?=?" ),
178	{ lhs, rhs }
179	);
180	}
181
182	Expression * makeOpMember( Expression * sue, const std::string & mem ) {
183	return new UntypedMemberExpr( new NameExpr( mem ), sue );
184	}
185
186	Statement * makeAccStatement( DeclarationWithType * object, unsigned long index, const std::string & member, Expression * value, const SymTab::Indexer & indexer ) {
187	std::unique_ptr< Expression > expr( makeOpAssign(
188	makeOpMember(
189	makeOpIndex(
190	object,
191	index
192	),
193	member
194	),
195	value
196	) );
197
198	return new ExprStmt( noLabels, ResolvExpr::findVoidExpression( expr.get(), indexer ) );
199	}
200
201	Expression * safeCond( Expression * expr, bool ifnull = true ) {
202	if( expr ) return expr;
203
204	return new ConstantExpr( Constant::from_bool( ifnull ) );
205	}
206	};
207
208
209	//=============================================================================================
210	// Generate waitfor implementation
211	//=============================================================================================
212
213	void GenerateWaitForPass::premutate( FunctionDecl * decl) {
214	if( decl->name != "__accept_internal" ) return;
215
216	decl_waitfor = decl;
217	}
218
219	void GenerateWaitForPass::premutate( StructDecl * decl ) {
220	if( ! decl->body ) return;
221
222	if( decl->name == "__acceptable_t" ) {
223	assert( !decl_acceptable );
224	decl_acceptable = decl;
225	}
226	else if( decl->name == "monitor_desc" ) {
227	assert( !decl_monitor );
228	decl_monitor = decl;
229	}
230	}
231
232	Statement * GenerateWaitForPass::postmutate( WaitForStmt * waitfor ) {
233	if( !decl_monitor \|\| !decl_acceptable ) throw SemanticError( "waitfor keyword requires monitors to be in scope, add #include <monitor>", waitfor );
234
235	CompoundStmt * stmt = new CompoundStmt( noLabels );
236
237	ObjectDecl * acceptables = declare( waitfor->clauses.size(), stmt );
238
239	int index = 0;
240	for( auto & clause : waitfor->clauses ) {
241	init( acceptables, index, clause, stmt );
242
243	index++;
244	}
245
246	Expression * timeout = init_timeout(
247	waitfor->timeout.time,
248	waitfor->timeout.condition,
249	waitfor->orelse .statement,
250	waitfor->orelse .condition,
251	stmt
252	);
253
254	Expression * result = call( waitfor->clauses.size(), acceptables, timeout, stmt );
255
256	choose( waitfor, result, stmt );
257
258	return stmt;
259	}
260
261	ObjectDecl * GenerateWaitForPass::declare( unsigned long count, CompoundStmt * stmt )
262	{
263	ObjectDecl * acceptables = ObjectDecl::newObject(
264	namer_acc.newName(),
265	new ArrayType(
266	noQualifiers,
267	new StructInstType(
268	noQualifiers,
269	decl_acceptable
270	),
271	new ConstantExpr( Constant::from_ulong( count ) ),
272	false,
273	false
274	),
275	nullptr
276	);
277
278	stmt->push_back( new DeclStmt( noLabels, acceptables) );
279
280	return acceptables;
281	}
282
283	ObjectDecl * GenerateWaitForPass::declMon( WaitForStmt::Clause & clause, CompoundStmt * stmt ) {
284
285	ObjectDecl * mon = ObjectDecl::newObject(
286	namer_mon.newName(),
287	new ArrayType(
288	noQualifiers,
289	new StructInstType(
290	noQualifiers,
291	decl_monitor
292	),
293	new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ),
294	false,
295	false
296	),
297	new ListInit(
298	map_range < std::list<Initializer> > ( clause.target.arguments, [this](Expression expr ){
299	return new SingleInit( expr );
300	})
301	)
302	);
303
304	stmt->push_back( new DeclStmt( noLabels, mon) );
305
306	return mon;
307	}
308
309	void GenerateWaitForPass::init( ObjectDecl * acceptables, int index, WaitForStmt::Clause & clause, CompoundStmt * stmt ) {
310
311	ObjectDecl * monitors = declMon( clause, stmt );
312
313	Type * fptr_t = new PointerType( noQualifiers, new FunctionType( noQualifiers, true ) );
314
315	CompoundStmt * compound = new CompoundStmt( noLabels );
316	compound->push_back( makeAccStatement( acceptables, index, "func" , new CastExpr( clause.target.function, fptr_t ) , indexer ) );
317	compound->push_back( makeAccStatement( acceptables, index, "count" , new ConstantExpr( Constant::from_ulong( clause.target.arguments.size() ) ), indexer ) );
318	compound->push_back( makeAccStatement( acceptables, index, "monitors", new VariableExpr( monitors ) , indexer ) );
319	compound->push_back( makeAccStatement( acceptables, index, "is_dtor" , new ConstantExpr( Constant::from_bool( true ) ) , indexer ) );
320
321	stmt->push_back( new IfStmt(
322	noLabels,
323	safeCond( clause.condition ),
324	compound,
325	nullptr
326	));
327
328	clause.target.function = nullptr;
329	clause.target.arguments.empty();
330	clause.condition = nullptr;
331	}
332
333	Expression * GenerateWaitForPass::init_timeout(
334	Expression *& time,
335	Expression *& time_cond,
336	bool has_else,
337	Expression *& else_cond,
338	CompoundStmt * stmt
339	) {
340	ObjectDecl * timeout = ObjectDecl::newObject(
341	namer_tim.newName(),
342	new BasicType(
343	noQualifiers,
344	BasicType::LongLongUnsignedInt
345	),
346	new SingleInit(
347	new ConstantExpr( Constant::from_int( -1 ) )
348	)
349	);
350
351	stmt->push_back( new DeclStmt( noLabels, timeout ) );
352
353	if( time ) {
354	stmt->push_back( new IfStmt(
355	noLabels,
356	safeCond( time_cond ),
357	new ExprStmt(
358	noLabels,
359	makeOpAssign(
360	new VariableExpr( timeout ),
361	time
362	)
363	),
364	nullptr
365	));
366
367	time = time_cond = nullptr;
368	}
369
370	if( has_else ) {
371	stmt->push_back( new IfStmt(
372	noLabels,
373	safeCond( else_cond ),
374	new ExprStmt(
375	noLabels,
376	makeOpAssign(
377	new VariableExpr( timeout ),
378	new ConstantExpr( Constant::from_ulong( 0 ) )
379	)
380	),
381	nullptr
382	));
383
384	else_cond = nullptr;
385	}
386
387	return new VariableExpr( timeout );
388	}
389
390	Expression * GenerateWaitForPass::call(
391	size_t count,
392	ObjectDecl * acceptables,
393	Expression * timeout,
394	CompoundStmt * stmt
395	) {
396	ObjectDecl * decl = ObjectDecl::newObject(
397	namer_ret.newName(),
398	new BasicType(
399	noQualifiers,
400	BasicType::LongLongUnsignedInt
401	),
402	new SingleInit(
403	new UntypedExpr(
404	VariableExpr::functionPointer( decl_waitfor ),
405	{
406	new ConstantExpr( Constant::from_ulong( count ) ),
407	new VariableExpr( acceptables ),
408	timeout
409	}
410	)
411	)
412	);
413
414	stmt->push_back( new DeclStmt( noLabels, decl ) );
415
416	return new VariableExpr( decl );
417	}
418
419	void GenerateWaitForPass::choose(
420	WaitForStmt * waitfor,
421	Expression * result,
422	CompoundStmt * stmt
423	) {
424	SwitchStmt * swtch = new SwitchStmt(
425	noLabels,
426	result,
427	std::list<Statement *>()
428	);
429
430	unsigned long i = 0;
431	for( auto & clause : waitfor->clauses ) {
432	swtch->statements.push_back(
433	new CaseStmt(
434	noLabels,
435	new ConstantExpr( Constant::from_ulong( i++ ) ),
436	{
437	clause.statement,
438	new BranchStmt(
439	noLabels,
440	"",
441	BranchStmt::Break
442	)
443	}
444	)
445	);
446	}
447
448	if(waitfor->timeout.statement) {
449	swtch->statements.push_back(
450	new CaseStmt(
451	noLabels,
452	new ConstantExpr( Constant::from_ulong( i++ ) ),
453	{
454	waitfor->timeout.statement,
455	new BranchStmt(
456	noLabels,
457	"",
458	BranchStmt::Break
459	)
460	}
461	)
462	);
463	}
464
465	if(waitfor->orelse.statement) {
466	swtch->statements.push_back(
467	new CaseStmt(
468	noLabels,
469	new ConstantExpr( Constant::from_ulong( i++ ) ),
470	{
471	waitfor->orelse.statement,
472	new BranchStmt(
473	noLabels,
474	"",
475	BranchStmt::Break
476	)
477	}
478	)
479	);
480	}
481
482	stmt->push_back( swtch );
483	}
484	};
485
486	// Local Variables: //
487	// mode: c //
488	// tab-width: 4 //
489	// End: //

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