source: src/Concurrency/Actors.cpp@ 11ab0b4a

Last change on this file since 11ab0b4a was b065dbb, checked in by caparsons <caparson@…>, 2 years ago

refactored actors to not need base pointers in envelopes
  • Property mode set to 100644
File size: 24.5 KB
Line 
1//
2// Cforall Version 1.0.0 Copyright (C) 2015 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// Actors.cpp -- generate code needed by the actor system
8//
9// Author : Colby Parsons
10// Created On : Thurs Jan 19 15:34:00 2023
11// Last Modified By : Colby Parsons
12// Last Modified On : Thurs Jan 19 15:34:00 2023
13// Update Count : 0
14//
15
16#include "AST/Print.hpp"
17#include "AST/Decl.hpp"
18#include "AST/Pass.hpp"
19#include "AST/Type.hpp"
20#include "AST/Stmt.hpp"
21#include "AST/TranslationUnit.hpp"
22#include "AST/Expr.hpp"
23#include <algorithm>
24using namespace ast;
25using namespace std;
26
27namespace Concurrency {
28
29struct CollectactorStructDecls : public ast::WithGuards {
30 unordered_set<const StructDecl *> & actorStructDecls;
31 unordered_set<const StructDecl *> & messageStructDecls;
32 const StructDecl ** requestDecl;
33 const EnumDecl ** allocationDecl;
34 const StructDecl ** actorDecl;
35 const StructDecl ** msgDecl;
36 StructDecl * parentDecl;
37 bool insideStruct = false;
38 bool namedDecl = false;
39
40 // finds and sets a ptr to the allocation enum, which is needed in the next pass
41 void previsit( const EnumDecl * decl ) {
42 if( decl->name == "allocation" ) *allocationDecl = decl;
43 }
44
45 // finds and sets a ptr to the actor, message, and request structs, which are needed in the next pass
46 void previsit( const StructDecl * decl ) {
47 if ( !decl->body ) return;
48 if ( decl->name == "actor" ) {
49 actorStructDecls.insert( decl ); // skip inserting fwd decl
50 *actorDecl = decl;
51 } else if( decl->name == "message" ) {
52 messageStructDecls.insert( decl ); // skip inserting fwd decl
53 *msgDecl = decl;
54 } else if( decl->name == "request" ) *requestDecl = decl;
55 else {
56 GuardValue(insideStruct);
57 insideStruct = true;
58 parentDecl = mutate( decl );
59 }
60 }
61
62 // this catches structs of the form:
63 // struct dummy_actor { actor a; };
64 // since they should be:
65 // struct dummy_actor { inline actor; };
66 void previsit ( const ObjectDecl * decl ) {
67 if ( insideStruct && ! decl->name.empty() ) {
68 GuardValue(namedDecl);
69 namedDecl = true;
70 }
71 }
72
73 // this collects the derived actor and message struct decl ptrs
74 void postvisit( const StructInstType * node ) {
75 if ( ! *actorDecl || ! *msgDecl ) return;
76 if ( insideStruct && !namedDecl ) {
77 auto actorIter = actorStructDecls.find( node->aggr() );
78 if ( actorIter != actorStructDecls.end() ) {
79 actorStructDecls.insert( parentDecl );
80 return;
81 }
82 auto messageIter = messageStructDecls.find( node->aggr() );
83 if ( messageIter != messageStructDecls.end() ) {
84 messageStructDecls.insert( parentDecl );
85 }
86 }
87 }
88
89 public:
90 CollectactorStructDecls( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
91 const StructDecl ** requestDecl, const EnumDecl ** allocationDecl, const StructDecl ** actorDecl, const StructDecl ** msgDecl )
92 : actorStructDecls( actorStructDecls ), messageStructDecls( messageStructDecls ), requestDecl( requestDecl ),
93 allocationDecl( allocationDecl ), actorDecl(actorDecl), msgDecl(msgDecl) {}
94};
95
96// keeps track of all fwdDecls of message routines so that we can hoist them to right after the appropriate decls
97class FwdDeclTable {
98
99 // tracks which decls we have seen so that we can hoist the FunctionDecl to the highest point possible
100 struct FwdDeclData {
101 const StructDecl * actorDecl;
102 const StructDecl * msgDecl;
103 FunctionDecl * fwdDecl;
104 bool actorFound;
105 bool msgFound;
106
107 bool readyToInsert() { return actorFound && msgFound; }
108 bool foundActor() { actorFound = true; return readyToInsert(); }
109 bool foundMsg() { msgFound = true; return readyToInsert(); }
110
111 FwdDeclData( const StructDecl * actorDecl, const StructDecl * msgDecl, FunctionDecl * fwdDecl ) :
112 actorDecl(actorDecl), msgDecl(msgDecl), fwdDecl(fwdDecl), actorFound(false), msgFound(false) {}
113 };
114
115 // map indexed by actor struct ptr
116 // value is map of all FwdDeclData that contains said actor struct ptr
117 // inner map is indexed by the message struct ptr of FwdDeclData
118 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> actorMap;
119
120 // this map is the same except the outer map is indexed by message ptr and the inner is indexed by actor ptr
121 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> msgMap;
122
123 void insert( const StructDecl * decl, const StructDecl * otherDecl, unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & map, FwdDeclData * data ) {
124 auto iter = map.find( decl );
125 if ( iter != map.end() ) { // if decl exists in map append data to existing inner map
126 iter->second.emplace( make_pair( otherDecl, data ) );
127 } else { // else create inner map for key
128 map.emplace( make_pair( decl, unordered_map<const StructDecl *, FwdDeclData *>( { make_pair( otherDecl, data ) } ) ) );
129 }
130 }
131
132 public:
133 // insert decl into table so that we can fwd declare it later (average cost: O(1))
134 void insertDecl( const StructDecl * actorDecl, const StructDecl * msgDecl, FunctionDecl * fwdDecl ) {
135 FwdDeclData * declToInsert = new FwdDeclData( actorDecl, msgDecl, fwdDecl );
136 insert( actorDecl, msgDecl, actorMap, declToInsert );
137 insert( msgDecl, actorDecl, msgMap, declToInsert );
138 }
139
140 // returns list of decls to insert after current struct decl
141 // Over the entire pass the runtime of this routine is O(r) where r is the # of receive routines
142 list<FunctionDecl *> updateDecl( const StructDecl * decl, bool isMsg ) {
143 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & map = isMsg ? msgMap : actorMap;
144 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & otherMap = isMsg ? actorMap : msgMap;
145 auto iter = map.find( decl );
146 list<FunctionDecl *> toInsertAfter; // this is populated with decls that are ready to insert
147 if ( iter == map.end() ) return toInsertAfter;
148
149 // iterate over inner map
150 unordered_map<const StructDecl *, FwdDeclData *> & currInnerMap = iter->second;
151 for ( auto innerIter = currInnerMap.begin(); innerIter != currInnerMap.end(); ) {
152 FwdDeclData * currentDatum = innerIter->second;
153 bool readyToInsert = isMsg ? currentDatum->foundMsg() : currentDatum->foundActor();
154 if ( ! readyToInsert ) { ++innerIter; continue; }
155
156 // readyToInsert is true so we are good to insert the forward decl of the message fn
157 toInsertAfter.push_back( currentDatum->fwdDecl );
158
159 // need to remove from other map before deleting
160 // find inner map in other map ( other map is actor map if original is msg map and vice versa )
161 const StructDecl * otherDecl = isMsg ? currentDatum->actorDecl : currentDatum->msgDecl;
162 auto otherMapIter = otherMap.find( otherDecl );
163
164 unordered_map<const StructDecl *, FwdDeclData *> & otherInnerMap = otherMapIter->second;
165
166 // find the FwdDeclData we need to remove in the other inner map
167 auto otherInnerIter = otherInnerMap.find( decl );
168
169 // remove references to deleted FwdDeclData from current inner map
170 innerIter = currInnerMap.erase( innerIter ); // this does the increment so no explicit inc needed
171
172 // remove references to deleted FwdDeclData from other inner map
173 otherInnerMap.erase( otherInnerIter );
174
175 // if other inner map is now empty, remove key from other outer map
176 if ( otherInnerMap.empty() )
177 otherMap.erase( otherDecl );
178
179 // now we are safe to delete the FwdDeclData since we are done with it
180 // and we have removed all references to it from our data structures
181 delete currentDatum;
182 }
183
184 // if current inner map is now empty, remove key from outer map.
185 // Have to do this after iterating for safety
186 if ( currInnerMap.empty() )
187 map.erase( decl );
188
189 return toInsertAfter;
190 }
191};
192
193// generates the definitions of send operators for actors
194// collects data needed for next pass that does the circular defn resolution
195// for message send operators (via table above)
196struct GenFuncsCreateTables : public ast::WithDeclsToAdd<> {
197 unordered_set<const StructDecl *> & actorStructDecls;
198 unordered_set<const StructDecl *> & messageStructDecls;
199 const StructDecl ** requestDecl;
200 const EnumDecl ** allocationDecl;
201 const StructDecl ** actorDecl;
202 const StructDecl ** msgDecl;
203 FwdDeclTable & forwardDecls;
204
205 // generates the operator for actor message sends
206 void postvisit( const FunctionDecl * decl ) {
207 // return if not of the form receive( param1, param2 ) or if it is a forward decl
208 if ( decl->name != "receive" || decl->params.size() != 2 || !decl->stmts ) return;
209
210 // the params should be references
211 const ReferenceType * derivedActorRef = dynamic_cast<const ReferenceType *>(decl->params.at(0)->get_type());
212 const ReferenceType * derivedMsgRef = dynamic_cast<const ReferenceType *>(decl->params.at(1)->get_type());
213 if ( !derivedActorRef || !derivedMsgRef ) return;
214
215 // the references should be to struct instances
216 const StructInstType * arg1InstType = dynamic_cast<const StructInstType *>(derivedActorRef->base.get());
217 const StructInstType * arg2InstType = dynamic_cast<const StructInstType *>(derivedMsgRef->base.get());
218 if ( !arg1InstType || !arg2InstType ) return;
219
220 // If the struct instances are derived actor and message types then generate the message send routine
221 auto actorIter = actorStructDecls.find( arg1InstType->aggr() );
222 auto messageIter = messageStructDecls.find( arg2InstType->aggr() );
223 if ( actorIter != actorStructDecls.end() && messageIter != messageStructDecls.end() ) {
224 //////////////////////////////////////////////////////////////////////
225 // The following generates this wrapper for all receive(derived_actor &, derived_msg &) functions
226 /* base_actor and base_msg are output params
227 static inline allocation __CFA_receive_wrap( derived_actor & receiver, derived_msg & msg, actor ** base_actor, message ** base_msg ) {
228 base_actor = &receiver;
229 base_msg = &msg;
230 return receive( receiver, msg );
231 }
232 */
233 CompoundStmt * wrapBody = new CompoundStmt( decl->location );
234
235 // generates: base_actor = &receiver;
236 wrapBody->push_back( new ExprStmt( decl->location,
237 UntypedExpr::createAssign( decl->location,
238 UntypedExpr::createDeref( decl->location, new NameExpr( decl->location, "base_actor" ) ),
239 new AddressExpr( decl->location, new NameExpr( decl->location, "receiver" ) )
240 )
241 ));
242
243 // generates: base_msg = &msg;
244 wrapBody->push_back( new ExprStmt( decl->location,
245 UntypedExpr::createAssign( decl->location,
246 UntypedExpr::createDeref( decl->location, new NameExpr( decl->location, "base_msg" ) ),
247 new AddressExpr( decl->location, new NameExpr( decl->location, "msg" ) )
248 )
249 ));
250
251 // generates: return receive( receiver, msg );
252 wrapBody->push_back( new ReturnStmt( decl->location,
253 new UntypedExpr ( decl->location,
254 new NameExpr( decl->location, "receive" ),
255 {
256 new NameExpr( decl->location, "receiver" ),
257 new NameExpr( decl->location, "msg" )
258 }
259 )
260 ));
261
262 // create receive wrapper to extract base message and actor pointer
263 // put it all together into the complete function decl from above
264 FunctionDecl * receiveWrapper = new FunctionDecl(
265 decl->location,
266 "__CFA_receive_wrap",
267 {}, // forall
268 {
269 new ObjectDecl(
270 decl->location,
271 "receiver",
272 ast::deepCopy( derivedActorRef )
273 ),
274 new ObjectDecl(
275 decl->location,
276 "msg",
277 ast::deepCopy( derivedMsgRef )
278 ),
279 new ObjectDecl(
280 decl->location,
281 "base_actor",
282 new PointerType( new PointerType( new StructInstType( *actorDecl ) ) )
283 ),
284 new ObjectDecl(
285 decl->location,
286 "base_msg",
287 new PointerType( new PointerType( new StructInstType( *msgDecl ) ) )
288 )
289 }, // params
290 {
291 new ObjectDecl(
292 decl->location,
293 "__CFA_receive_wrap_ret",
294 new EnumInstType( *allocationDecl )
295 )
296 },
297 wrapBody, // body
298 { Storage::Static }, // storage
299 Linkage::Cforall, // linkage
300 {}, // attributes
301 { Function::Inline }
302 );
303
304 declsToAddAfter.push_back( receiveWrapper );
305
306 //////////////////////////////////////////////////////////////////////
307 // The following generates this send message operator routine for all receive(derived_actor &, derived_msg &) functions
308 /*
309 static inline derived_actor & ?|?( derived_actor & receiver, derived_msg & msg ) {
310 request new_req;
311 allocation (*my_work_fn)( derived_actor &, derived_msg & ) = receive;
312 __receive_fn fn = (__receive_fn)my_work_fn;
313 new_req{ &receiver, &msg, fn };
314 send( receiver, new_req );
315 return receiver;
316 }
317 */
318 CompoundStmt * sendBody = new CompoundStmt( decl->location );
319
320 // Generates: request new_req;
321 sendBody->push_back( new DeclStmt(
322 decl->location,
323 new ObjectDecl(
324 decl->location,
325 "new_req",
326 new StructInstType( *requestDecl )
327 )
328 ));
329
330 // Function type is: allocation (*)( derived_actor &, derived_msg &, actor **, message ** )
331 FunctionType * derivedReceive = new FunctionType();
332 derivedReceive->params.push_back( ast::deepCopy( derivedActorRef ) );
333 derivedReceive->params.push_back( ast::deepCopy( derivedMsgRef ) );
334 derivedReceive->params.push_back( new PointerType( new PointerType( new StructInstType( *actorDecl ) ) ) );
335 derivedReceive->params.push_back( new PointerType( new PointerType( new StructInstType( *msgDecl ) ) ) );
336 derivedReceive->returns.push_back( new EnumInstType( *allocationDecl ) );
337
338 // Generates: allocation (*my_work_fn)( derived_actor &, derived_msg &, actor **, message ** ) = receive;
339 sendBody->push_back( new DeclStmt(
340 decl->location,
341 new ObjectDecl(
342 decl->location,
343 "my_work_fn",
344 new PointerType( derivedReceive ),
345 new SingleInit( decl->location, new NameExpr( decl->location, "__CFA_receive_wrap" ) )
346 )
347 ));
348
349 // Function type is: allocation (*)( actor &, message & )
350 FunctionType * genericReceive = new FunctionType();
351 genericReceive->params.push_back( new ReferenceType( new StructInstType( *actorDecl ) ) );
352 genericReceive->params.push_back( new ReferenceType( new StructInstType( *msgDecl ) ) );
353 genericReceive->params.push_back( new PointerType( new PointerType( new StructInstType( *actorDecl ) ) ) );
354 genericReceive->params.push_back( new PointerType( new PointerType( new StructInstType( *msgDecl ) ) ) );
355 genericReceive->returns.push_back( new EnumInstType( *allocationDecl ) );
356
357 // Generates: allocation (*fn)( actor &, message & ) = (allocation (*)( actor &, message & ))my_work_fn;
358 // More readable synonymous code:
359 // typedef allocation (*__receive_fn)(actor &, message &);
360 // __receive_fn fn = (__receive_fn)my_work_fn;
361 sendBody->push_back( new DeclStmt(
362 decl->location,
363 new ObjectDecl(
364 decl->location,
365 "fn",
366 new PointerType( genericReceive ),
367 new SingleInit( decl->location,
368 new CastExpr( decl->location, new NameExpr( decl->location, "my_work_fn" ), new PointerType( genericReceive ), ExplicitCast )
369 )
370 )
371 ));
372
373 // Generates: new_req{ (actor *)&receiver, (message *)&msg, fn };
374 sendBody->push_back( new ExprStmt(
375 decl->location,
376 new UntypedExpr (
377 decl->location,
378 new NameExpr( decl->location, "?{}" ),
379 {
380 new NameExpr( decl->location, "new_req" ),
381 new CastExpr( decl->location, new AddressExpr( new NameExpr( decl->location, "receiver" ) ), new PointerType( new StructInstType( *actorDecl ) ), ExplicitCast ),
382 new CastExpr( decl->location, new AddressExpr( new NameExpr( decl->location, "msg" ) ), new PointerType( new StructInstType( *msgDecl ) ), ExplicitCast ),
383 new NameExpr( decl->location, "fn" )
384 }
385 )
386 ));
387
388 // Generates: send( receiver, new_req );
389 sendBody->push_back( new ExprStmt(
390 decl->location,
391 new UntypedExpr (
392 decl->location,
393 new NameExpr( decl->location, "send" ),
394 {
395 {
396 new NameExpr( decl->location, "receiver" ),
397 new NameExpr( decl->location, "new_req" )
398 }
399 }
400 )
401 ));
402
403 // Generates: return receiver;
404 sendBody->push_back( new ReturnStmt( decl->location, new NameExpr( decl->location, "receiver" ) ) );
405
406 // put it all together into the complete function decl from above
407 FunctionDecl * sendOperatorFunction = new FunctionDecl(
408 decl->location,
409 "?|?",
410 {}, // forall
411 {
412 new ObjectDecl(
413 decl->location,
414 "receiver",
415 ast::deepCopy( derivedActorRef )
416 ),
417 new ObjectDecl(
418 decl->location,
419 "msg",
420 ast::deepCopy( derivedMsgRef )
421 )
422 }, // params
423 {
424 new ObjectDecl(
425 decl->location,
426 "receiver_ret",
427 ast::deepCopy( derivedActorRef )
428 )
429 },
430 nullptr, // body
431 { Storage::Static }, // storage
432 Linkage::Cforall, // linkage
433 {}, // attributes
434 { Function::Inline }
435 );
436
437 // forward decls to resolve use before decl problem for '|' routines
438 forwardDecls.insertDecl( *actorIter, *messageIter , ast::deepCopy( sendOperatorFunction ) );
439
440 sendOperatorFunction->stmts = sendBody;
441 declsToAddAfter.push_back( sendOperatorFunction );
442 }
443 }
444
445 public:
446 GenFuncsCreateTables( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
447 const StructDecl ** requestDecl, const EnumDecl ** allocationDecl, const StructDecl ** actorDecl, const StructDecl ** msgDecl,
448 FwdDeclTable & forwardDecls ) : actorStructDecls(actorStructDecls), messageStructDecls(messageStructDecls),
449 requestDecl(requestDecl), allocationDecl(allocationDecl), actorDecl(actorDecl), msgDecl(msgDecl), forwardDecls(forwardDecls) {}
450};
451
452
453// separate pass is needed since this pass resolves circular defn issues
454// generates the forward declarations of the send operator for actor routines
455struct FwdDeclOperator : public ast::WithDeclsToAdd<> {
456 unordered_set<const StructDecl *> & actorStructDecls;
457 unordered_set<const StructDecl *> & messageStructDecls;
458 FwdDeclTable & forwardDecls;
459
460 // handles forward declaring the message operator
461 void postvisit( const StructDecl * decl ) {
462 list<FunctionDecl *> toAddAfter;
463 auto actorIter = actorStructDecls.find( decl );
464 if ( actorIter != actorStructDecls.end() ) { // this is a derived actor decl
465 // get list of fwd decls that we can now insert
466 toAddAfter = forwardDecls.updateDecl( decl, false );
467
468 // get rid of decl from actorStructDecls since we no longer need it
469 actorStructDecls.erase( actorIter );
470 } else {
471 auto messageIter = messageStructDecls.find( decl );
472 if ( messageIter == messageStructDecls.end() ) return;
473
474 toAddAfter = forwardDecls.updateDecl( decl, true );
475
476 // get rid of decl from messageStructDecls since we no longer need it
477 messageStructDecls.erase( messageIter );
478 }
479
480 // add the fwd decls to declsToAddAfter
481 for ( FunctionDecl * func : toAddAfter ) {
482 declsToAddAfter.push_back( func );
483 }
484 }
485
486 public:
487 FwdDeclOperator( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
488 FwdDeclTable & forwardDecls ) : actorStructDecls(actorStructDecls), messageStructDecls(messageStructDecls), forwardDecls(forwardDecls) {}
489};
490
491void implementActors( TranslationUnit & translationUnit ) {
492 // unordered_maps to collect all derived actor and message types
493 unordered_set<const StructDecl *> actorStructDecls;
494 unordered_set<const StructDecl *> messageStructDecls;
495 FwdDeclTable forwardDecls;
496
497 // for storing through the passes
498 // these are populated with various important struct decls
499 const StructDecl * requestDeclPtr = nullptr;
500 const EnumDecl * allocationDeclPtr = nullptr;
501 const StructDecl * actorDeclPtr = nullptr;
502 const StructDecl * msgDeclPtr = nullptr;
503
504 // double pointer to modify local ptrs above
505 const StructDecl ** requestDecl = &requestDeclPtr;
506 const EnumDecl ** allocationDecl = &allocationDeclPtr;
507 const StructDecl ** actorDecl = &actorDeclPtr;
508 const StructDecl ** msgDecl = &msgDeclPtr;
509
510 // first pass collects ptrs to allocation enum, request type, and generic receive fn typedef
511 // also populates maps of all derived actors and messages
512 Pass<CollectactorStructDecls>::run( translationUnit, actorStructDecls, messageStructDecls, requestDecl,
513 allocationDecl, actorDecl, msgDecl );
514
515 // check that we have found all the decls we need from <actor.hfa>, if not no need to run the rest of this pass
516 if ( !allocationDeclPtr || !requestDeclPtr || !actorDeclPtr || !msgDeclPtr )
517 return;
518
519 // second pass locates all receive() routines that overload the generic receive fn
520 // it then generates the appropriate operator '|' send routines for the receive routines
521 Pass<GenFuncsCreateTables>::run( translationUnit, actorStructDecls, messageStructDecls, requestDecl,
522 allocationDecl, actorDecl, msgDecl, forwardDecls );
523
524 // The third pass forward declares operator '|' send routines
525 Pass<FwdDeclOperator>::run( translationUnit, actorStructDecls, messageStructDecls, forwardDecls );
526}
527
528
529} // namespace Concurrency
530
531// Local Variables: //
532// tab-width: 4 //
533// mode: c++ //
534// compile-command: "make install" //
535// End: //
536
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