source: src/Concurrency/Actors.cpp@ 44196deb

ADT ast-experimental
Last change on this file since 44196deb was 2d028039, checked in by caparson <caparson@…>, 3 years ago

added support for copy based envelopes
  • Property mode set to 100644
File size: 19.4 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 GuardValue(insideStruct);
48 insideStruct = true;
49 parentDecl = mutate( decl );
50 if( decl->name == "actor" ) *actorDecl = decl;
51 if( decl->name == "message" ) *msgDecl = decl;
52 if( decl->name == "request" ) *requestDecl = decl;
53 }
54
55 // this catches structs of the form:
56 // struct dummy_actor { actor a; };
57 // since they should be:
58 // struct dummy_actor { inline actor; };
59 void previsit ( const ObjectDecl * decl ) {
60 if ( insideStruct && ! decl->name.empty() ) {
61 GuardValue(namedDecl);
62 namedDecl = true;
63 }
64 }
65
66 // this collects the valid actor and message struct decl pts
67 void postvisit( const StructInstType * node ) {
68 if ( ! *actorDecl || ! *msgDecl ) return;
69 if ( insideStruct && !namedDecl ) {
70 if ( node->aggr() == *actorDecl ) {
71 actorStructDecls.insert( parentDecl );
72 } else if ( node->aggr() == *msgDecl ) {
73 messageStructDecls.insert( parentDecl );
74 }
75 }
76 }
77
78 public:
79 CollectactorStructDecls( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
80 const StructDecl ** requestDecl, const EnumDecl ** allocationDecl, const StructDecl ** actorDecl, const StructDecl ** msgDecl )
81 : actorStructDecls( actorStructDecls ), messageStructDecls( messageStructDecls ), requestDecl( requestDecl ),
82 allocationDecl( allocationDecl ), actorDecl(actorDecl), msgDecl(msgDecl) {}
83};
84
85// keeps track of all fwdDecls of message routines so that we can hoist them to right after the appropriate decls
86class FwdDeclTable {
87
88 // tracks which decls we have seen so that we can hoist the FunctionDecl to the highest point possible
89 struct FwdDeclData {
90 const StructDecl * actorDecl;
91 const StructDecl * msgDecl;
92 FunctionDecl * fwdDecl;
93 bool actorFound;
94 bool msgFound;
95
96 bool readyToInsert() { return actorFound && msgFound; }
97 bool foundActor() { actorFound = true; return readyToInsert(); }
98 bool foundMsg() { msgFound = true; return readyToInsert(); }
99
100 FwdDeclData( const StructDecl * actorDecl, const StructDecl * msgDecl, FunctionDecl * fwdDecl ) :
101 actorDecl(actorDecl), msgDecl(msgDecl), fwdDecl(fwdDecl), actorFound(false), msgFound(false) {}
102 };
103
104 // map indexed by actor struct ptr
105 // value is map of all FwdDeclData that contains said actor struct ptr
106 // inner map is indexed by the message struct ptr of FwdDeclData
107 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> actorMap;
108
109 // this map is the same except the outer map is indexed by message ptr and the inner is indexed by actor ptr
110 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> msgMap;
111
112 void insert( const StructDecl * decl, const StructDecl * otherDecl, unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & map, FwdDeclData * data ) {
113 auto iter = map.find( decl );
114 if ( iter != map.end() ) { // if decl exists in map append data to existing inner map
115 iter->second.emplace( make_pair( otherDecl, data ) );
116 } else { // else create inner map for key
117 map.emplace( make_pair( decl, unordered_map<const StructDecl *, FwdDeclData *>( { make_pair( otherDecl, data ) } ) ) );
118 }
119 }
120
121 public:
122 // insert decl into table so that we can fwd declare it later (average cost: O(1))
123 void insertDecl( const StructDecl * actorDecl, const StructDecl * msgDecl, FunctionDecl * fwdDecl ) {
124 FwdDeclData * declToInsert = new FwdDeclData( actorDecl, msgDecl, fwdDecl );
125 insert( actorDecl, msgDecl, actorMap, declToInsert );
126 insert( msgDecl, actorDecl, msgMap, declToInsert );
127 }
128
129 // returns list of decls to insert after current struct decl
130 // Over the entire pass the runtime of this routine is O(r) where r is the # of receive routines
131 list<FunctionDecl *> updateDecl( const StructDecl * decl, bool isMsg ) {
132 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & map = isMsg ? msgMap : actorMap;
133 unordered_map<const StructDecl *, unordered_map<const StructDecl *, FwdDeclData *>> & otherMap = isMsg ? actorMap : msgMap;
134 auto iter = map.find( decl );
135 list<FunctionDecl *> toInsertAfter; // this is populated with decls that are ready to insert
136 if ( iter == map.end() ) return toInsertAfter;
137
138 // iterate over inner map
139 unordered_map<const StructDecl *, FwdDeclData *> & currInnerMap = iter->second;
140 for ( auto innerIter = currInnerMap.begin(); innerIter != currInnerMap.end(); ) {
141 FwdDeclData * currentDatum = innerIter->second;
142 bool readyToInsert = isMsg ? currentDatum->foundMsg() : currentDatum->foundActor();
143 if ( ! readyToInsert ) { ++innerIter; continue; }
144
145 // readyToInsert is true so we are good to insert the forward decl of the message fn
146 toInsertAfter.push_back( currentDatum->fwdDecl );
147
148 // need to remove from other map before deleting
149 // find inner map in other map ( other map is actor map if original is msg map and vice versa )
150 const StructDecl * otherDecl = isMsg ? currentDatum->actorDecl : currentDatum->msgDecl;
151 auto otherMapIter = otherMap.find( otherDecl );
152
153 unordered_map<const StructDecl *, FwdDeclData *> & otherInnerMap = otherMapIter->second;
154
155 // find the FwdDeclData we need to remove in the other inner map
156 auto otherInnerIter = otherInnerMap.find( decl );
157
158 // remove references to deleted FwdDeclData from current inner map
159 innerIter = currInnerMap.erase( innerIter ); // this does the increment so no explicit inc needed
160
161 // remove references to deleted FwdDeclData from other inner map
162 otherInnerMap.erase( otherInnerIter );
163
164 // if other inner map is now empty, remove key from other outer map
165 if ( otherInnerMap.empty() )
166 otherMap.erase( otherDecl );
167
168 // now we are safe to delete the FwdDeclData since we are done with it
169 // and we have removed all references to it from our data structures
170 delete currentDatum;
171 }
172
173 // if current inner map is now empty, remove key from outer map.
174 // Have to do this after iterating for safety
175 if ( currInnerMap.empty() )
176 map.erase( decl );
177
178 return toInsertAfter;
179 }
180};
181
182struct GenReceiveDecls : public ast::WithDeclsToAdd<> {
183 unordered_set<const StructDecl *> & actorStructDecls;
184 unordered_set<const StructDecl *> & messageStructDecls;
185 const StructDecl ** requestDecl;
186 const EnumDecl ** allocationDecl;
187 const StructDecl ** actorDecl;
188 const StructDecl ** msgDecl;
189 FwdDeclTable & forwardDecls;
190
191 void postvisit( const FunctionDecl * decl ) {
192 // return if not of the form receive( param1, param2 ) or if it is a forward decl
193 if ( decl->name != "receive" || decl->params.size() != 2 || !decl->stmts ) return;
194
195 // the params should be references
196 const ReferenceType * derivedActorRef = dynamic_cast<const ReferenceType *>(decl->params.at(0)->get_type());
197 const ReferenceType * derivedMsgRef = dynamic_cast<const ReferenceType *>(decl->params.at(1)->get_type());
198 if ( !derivedActorRef || !derivedMsgRef ) return;
199
200 // the references should be to struct instances
201 const StructInstType * arg1InstType = dynamic_cast<const StructInstType *>(derivedActorRef->base.get());
202 const StructInstType * arg2InstType = dynamic_cast<const StructInstType *>(derivedMsgRef->base.get());
203 if ( !arg1InstType || !arg2InstType ) return;
204
205 // If the struct instances are derived actor and message types then generate the message send routine
206 auto actorIter = actorStructDecls.find( arg1InstType->aggr() );
207 auto messageIter = messageStructDecls.find( arg2InstType->aggr() );
208 if ( actorIter != actorStructDecls.end() && messageIter != messageStructDecls.end() ) {
209
210 // check that we have found all the decls we need from <actor.hfa>
211 if ( !*allocationDecl || !*requestDecl )
212 SemanticError( decl->location, "using actors requires a header, add #include <actor.hfa>\n" );
213
214 //////////////////////////////////////////////////////////////////////
215 // The following generates this send message operator routine for all receive(derived_actor &, derived_msg &) functions
216 /*
217 static inline derived_actor & ?|?( derived_actor & receiver, derived_msg & msg ) {
218 request new_req;
219 Allocation (*my_work_fn)( derived_actor &, derived_msg & ) = receive;
220 __receive_fn fn = (__receive_fn)my_work_fn;
221 new_req{ &receiver, &msg, fn };
222 send( receiver, new_req );
223 return receiver;
224 }
225 */ // C_TODO: update this with new no alloc version
226 CompoundStmt * sendBody = new CompoundStmt( decl->location );
227
228 // Generates: request new_req;
229 sendBody->push_back( new DeclStmt(
230 decl->location,
231 new ObjectDecl(
232 decl->location,
233 "new_req",
234 new StructInstType( *requestDecl )
235 )
236 ));
237
238 // Function type is: Allocation (*)( derived_actor &, derived_msg & )
239 FunctionType * derivedReceive = new FunctionType();
240 derivedReceive->params.push_back( ast::deepCopy( derivedActorRef ) );
241 derivedReceive->params.push_back( ast::deepCopy( derivedMsgRef ) );
242 derivedReceive->returns.push_back( new EnumInstType( *allocationDecl ) );
243
244 // Generates: Allocation (*my_work_fn)( derived_actor &, derived_msg & ) = receive;
245 sendBody->push_back( new DeclStmt(
246 decl->location,
247 new ObjectDecl(
248 decl->location,
249 "my_work_fn",
250 new PointerType( derivedReceive ),
251 new SingleInit( decl->location, new NameExpr( decl->location, "receive" ) )
252 )
253 ));
254
255 // Function type is: Allocation (*)( actor &, messsage & )
256 FunctionType * genericReceive = new FunctionType();
257 genericReceive->params.push_back( new ReferenceType( new StructInstType( *actorDecl ) ) );
258 genericReceive->params.push_back( new ReferenceType( new StructInstType( *msgDecl ) ) );
259 genericReceive->returns.push_back( new EnumInstType( *allocationDecl ) );
260
261 // Generates: Allocation (*fn)( actor &, messsage & ) = (Allocation (*)( actor &, messsage & ))my_work_fn;
262 // More readable synonymous code:
263 // typedef Allocation (*__receive_fn)(actor &, message &);
264 // __receive_fn fn = (__receive_fn)my_work_fn;
265 sendBody->push_back( new DeclStmt(
266 decl->location,
267 new ObjectDecl(
268 decl->location,
269 "fn",
270 new PointerType( genericReceive ),
271 new SingleInit( decl->location,
272 new CastExpr( decl->location, new NameExpr( decl->location, "my_work_fn" ), new PointerType( genericReceive ), ExplicitCast )
273 )
274 )
275 ));
276
277 // Generates: new_req{ &receiver, &msg, fn };
278 sendBody->push_back( new ExprStmt(
279 decl->location,
280 new UntypedExpr (
281 decl->location,
282 new NameExpr( decl->location, "?{}" ),
283 {
284 new NameExpr( decl->location, "new_req" ),
285 new AddressExpr( new NameExpr( decl->location, "receiver" ) ),
286 new AddressExpr( new NameExpr( decl->location, "msg" ) ),
287 new NameExpr( decl->location, "fn" )
288 }
289 )
290 ));
291
292 // Generates: send( receiver, new_req );
293 sendBody->push_back( new ExprStmt(
294 decl->location,
295 new UntypedExpr (
296 decl->location,
297 new NameExpr( decl->location, "send" ),
298 {
299 {
300 new NameExpr( decl->location, "receiver" ),
301 new NameExpr( decl->location, "new_req" )
302 }
303 }
304 )
305 ));
306
307 // Generates: return receiver;
308 sendBody->push_back( new ReturnStmt( decl->location, new NameExpr( decl->location, "receiver" ) ) );
309
310 // put it all together into the complete function decl from above
311 FunctionDecl * sendOperatorFunction = new FunctionDecl(
312 decl->location,
313 "?|?",
314 {}, // forall
315 {
316 new ObjectDecl(
317 decl->location,
318 "receiver",
319 ast::deepCopy( derivedActorRef )
320 ),
321 new ObjectDecl(
322 decl->location,
323 "msg",
324 ast::deepCopy( derivedMsgRef )
325 )
326 }, // params
327 {
328 new ObjectDecl(
329 decl->location,
330 "receiver_ret",
331 ast::deepCopy( derivedActorRef )
332 )
333 },
334 nullptr, // body
335 { Storage::Static }, // storage
336 Linkage::Cforall, // linkage
337 {}, // attributes
338 { Function::Inline }
339 );
340
341 // forward decls to resolve use before decl problem for '|' routines
342 forwardDecls.insertDecl( *actorIter, *messageIter , ast::deepCopy( sendOperatorFunction ) );
343 // forwardDecls.push_back( ast::deepCopy( sendOperatorFunction ) );
344
345 sendOperatorFunction->stmts = sendBody;
346 declsToAddAfter.push_back( sendOperatorFunction );
347 }
348 }
349
350 public:
351 GenReceiveDecls( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
352 const StructDecl ** requestDecl, const EnumDecl ** allocationDecl, const StructDecl ** actorDecl, const StructDecl ** msgDecl,
353 FwdDeclTable & forwardDecls ) : actorStructDecls(actorStructDecls), messageStructDecls(messageStructDecls),
354 requestDecl(requestDecl), allocationDecl(allocationDecl), actorDecl(actorDecl), msgDecl(msgDecl), forwardDecls(forwardDecls) {}
355};
356
357struct GenFwdDecls : public ast::WithDeclsToAdd<> {
358 unordered_set<const StructDecl *> & actorStructDecls;
359 unordered_set<const StructDecl *> & messageStructDecls;
360 FwdDeclTable & forwardDecls;
361
362 void postvisit( const StructDecl * decl ) {
363 list<FunctionDecl *> toAddAfter;
364 auto actorIter = actorStructDecls.find( decl );
365 if ( actorIter != actorStructDecls.end() ) { // this is a derived actor decl
366 // get list of fwd decls that we can now insert
367 toAddAfter = forwardDecls.updateDecl( decl, false );
368
369 // get rid of decl from actorStructDecls since we no longer need it
370 actorStructDecls.erase( actorIter );
371 } else {
372 auto messageIter = messageStructDecls.find( decl );
373 if ( messageIter == messageStructDecls.end() ) return;
374
375 toAddAfter = forwardDecls.updateDecl( decl, true );
376
377 // get rid of decl from messageStructDecls since we no longer need it
378 messageStructDecls.erase( messageIter );
379 }
380
381 // add the fwd decls to declsToAddAfter
382 for ( FunctionDecl * func : toAddAfter ) {
383 declsToAddAfter.push_back( func );
384 }
385 }
386
387 public:
388 GenFwdDecls( unordered_set<const StructDecl *> & actorStructDecls, unordered_set<const StructDecl *> & messageStructDecls,
389 FwdDeclTable & forwardDecls ) : actorStructDecls(actorStructDecls), messageStructDecls(messageStructDecls),
390 forwardDecls(forwardDecls) {}
391};
392
393void implementActors( TranslationUnit & translationUnit ) {
394 // unordered_maps to collect all derived actor and message types
395 unordered_set<const StructDecl *> actorStructDecls;
396 unordered_set<const StructDecl *> messageStructDecls;
397 FwdDeclTable forwardDecls;
398
399 // for storing through the passes
400 // these are populated with various important struct decls
401 const StructDecl * requestDeclPtr = nullptr;
402 const EnumDecl * allocationDeclPtr = nullptr;
403 const StructDecl * actorDeclPtr = nullptr;
404 const StructDecl * msgDeclPtr = nullptr;
405
406 // double pointer to modify local ptrs above
407 const StructDecl ** requestDecl = &requestDeclPtr;
408 const EnumDecl ** allocationDecl = &allocationDeclPtr;
409 const StructDecl ** actorDecl = &actorDeclPtr;
410 const StructDecl ** msgDecl = &msgDeclPtr;
411
412 // first pass collects ptrs to Allocation enum, request type, and generic receive fn typedef
413 // also populates maps of all derived actors and messages
414 Pass<CollectactorStructDecls>::run( translationUnit, actorStructDecls, messageStructDecls, requestDecl,
415 allocationDecl, actorDecl, msgDecl );
416
417 // second pass locates all receive() routines that overload the generic receive fn
418 // it then generates the appropriate operator '|' send routines for the receive routines
419 Pass<GenReceiveDecls>::run( translationUnit, actorStructDecls, messageStructDecls, requestDecl,
420 allocationDecl, actorDecl, msgDecl, forwardDecls );
421
422 // The third pass forward declares operator '|' send routines
423 Pass<GenFwdDecls>::run( translationUnit, actorStructDecls, messageStructDecls, forwardDecls );
424}
425
426
427} // namespace Concurrency
428
429// Local Variables: //
430// tab-width: 4 //
431// mode: c++ //
432// compile-command: "make install" //
433// End: //
434
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