source: src/InitTweak/InitTweak.cc@ 462a7c7

ADT arm-eh ast-experimental enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 462a7c7 was 2d11663, checked in by Aaron Moss <a3moss@…>, 6 years ago

resolver porting; finish top level of initialization
  • Property mode set to 100644
File size: 33.8 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// InitTweak.cc --
8//
9// Author : Rob Schluntz
10// Created On : Fri May 13 11:26:36 2016
11// Last Modified By : Aaron B. Moss
12// Last Modified On : Mon Jun 10 13:30:00 2019
13// Update Count : 5
14//
15
16#include <algorithm> // for find, all_of
17#include <cassert> // for assertf, assert, strict_dynamic_cast
18#include <iostream> // for ostream, cerr, endl
19#include <iterator> // for back_insert_iterator, back_inserter
20#include <memory> // for __shared_ptr
21#include <vector>
22
23#include "AST/Expr.hpp"
24#include "AST/Stmt.hpp"
25#include "AST/Type.hpp"
26#include "Common/PassVisitor.h"
27#include "Common/SemanticError.h" // for SemanticError
28#include "Common/UniqueName.h" // for UniqueName
29#include "Common/utility.h" // for toString, deleteAll, maybeClone
30#include "GenPoly/GenPoly.h" // for getFunctionType
31#include "InitTweak.h"
32#include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic
33#include "ResolvExpr/typeops.h" // for typesCompatibleIgnoreQualifiers
34#include "SymTab/Autogen.h"
35#include "SymTab/Indexer.h" // for Indexer
36#include "SynTree/Attribute.h" // for Attribute
37#include "SynTree/Constant.h" // for Constant
38#include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType
39#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applicati...
40#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
41#include "SynTree/Label.h" // for Label
42#include "SynTree/Statement.h" // for CompoundStmt, ExprStmt, BranchStmt
43#include "SynTree/Type.h" // for FunctionType, ArrayType, PointerType
44#include "SynTree/Visitor.h" // for Visitor, maybeAccept
45#include "Tuples/Tuples.h" // for Tuples::isTtype
46
47namespace InitTweak {
48 namespace {
49 struct HasDesignations : public WithShortCircuiting {
50 bool hasDesignations = false;
51
52 void previsit( BaseSyntaxNode * ) {
53 // short circuit if we already know there are designations
54 if ( hasDesignations ) visit_children = false;
55 }
56
57 void previsit( Designation * des ) {
58 // short circuit if we already know there are designations
59 if ( hasDesignations ) visit_children = false;
60 else if ( ! des->get_designators().empty() ) {
61 hasDesignations = true;
62 visit_children = false;
63 }
64 }
65 };
66
67 struct InitDepthChecker : public WithGuards {
68 bool depthOkay = true;
69 Type * type;
70 int curDepth = 0, maxDepth = 0;
71 InitDepthChecker( Type * type ) : type( type ) {
72 Type * t = type;
73 while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) {
74 maxDepth++;
75 t = at->get_base();
76 }
77 maxDepth++;
78 }
79 void previsit( ListInit * ) {
80 curDepth++;
81 GuardAction( [this]() { curDepth--; } );
82 if ( curDepth > maxDepth ) depthOkay = false;
83 }
84 };
85
86 struct InitFlattener : public WithShortCircuiting {
87 void previsit( SingleInit * singleInit ) {
88 visit_children = false;
89 argList.push_back( singleInit->value->clone() );
90 }
91 std::list< Expression * > argList;
92 };
93
94 }
95
96 std::list< Expression * > makeInitList( Initializer * init ) {
97 PassVisitor<InitFlattener> flattener;
98 maybeAccept( init, flattener );
99 return flattener.pass.argList;
100 }
101
102 bool isDesignated( Initializer * init ) {
103 PassVisitor<HasDesignations> finder;
104 maybeAccept( init, finder );
105 return finder.pass.hasDesignations;
106 }
107
108 bool checkInitDepth( ObjectDecl * objDecl ) {
109 PassVisitor<InitDepthChecker> checker( objDecl->type );
110 maybeAccept( objDecl->init, checker );
111 return checker.pass.depthOkay;
112 }
113
114 class InitExpander::ExpanderImpl {
115 public:
116 virtual ~ExpanderImpl() = default;
117 virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;
118 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;
119 };
120
121 class InitImpl : public InitExpander::ExpanderImpl {
122 public:
123 InitImpl( Initializer * init ) : init( init ) {}
124 virtual ~InitImpl() = default;
125
126 virtual std::list< Expression * > next( __attribute((unused)) std::list< Expression * > & indices ) {
127 // this is wrong, but just a placeholder for now
128 // if ( ! flattened ) flatten( indices );
129 // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >();
130 return makeInitList( init );
131 }
132
133 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
134 private:
135 Initializer * init;
136 };
137
138 class ExprImpl : public InitExpander::ExpanderImpl {
139 public:
140 ExprImpl( Expression * expr ) : arg( expr ) {}
141 virtual ~ExprImpl() { delete arg; }
142
143 virtual std::list< Expression * > next( std::list< Expression * > & indices ) {
144 std::list< Expression * > ret;
145 Expression * expr = maybeClone( arg );
146 if ( expr ) {
147 for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) {
148 // go through indices and layer on subscript exprs ?[?]
149 ++it;
150 UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") );
151 subscriptExpr->get_args().push_back( expr );
152 subscriptExpr->get_args().push_back( (*it)->clone() );
153 expr = subscriptExpr;
154 }
155 ret.push_back( expr );
156 }
157 return ret;
158 }
159
160 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
161 private:
162 Expression * arg;
163 };
164
165 InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {}
166
167 InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {}
168
169 std::list< Expression * > InitExpander::operator*() {
170 return cur;
171 }
172
173 InitExpander & InitExpander::operator++() {
174 cur = expander->next( indices );
175 return *this;
176 }
177
178 // use array indices list to build switch statement
179 void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) {
180 indices.push_back( index );
181 indices.push_back( dimension );
182 }
183
184 void InitExpander::clearArrayIndices() {
185 deleteAll( indices );
186 indices.clear();
187 }
188
189 bool InitExpander::addReference() {
190 bool added = false;
191 for ( Expression *& expr : cur ) {
192 expr = new AddressExpr( expr );
193 added = true;
194 }
195 return added;
196 }
197
198 namespace {
199 /// given index i, dimension d, initializer init, and callExpr f, generates
200 /// if (i < d) f(..., init)
201 /// ++i;
202 /// so that only elements within the range of the array are constructed
203 template< typename OutIterator >
204 void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) {
205 UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") );
206 cond->get_args().push_back( index->clone() );
207 cond->get_args().push_back( dimension->clone() );
208
209 std::list< Expression * > args = makeInitList( init );
210 callExpr->get_args().splice( callExpr->get_args().end(), args );
211
212 *out++ = new IfStmt( cond, new ExprStmt( callExpr ), nullptr );
213
214 UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) );
215 increment->get_args().push_back( index->clone() );
216 *out++ = new ExprStmt( increment );
217 }
218
219 template< typename OutIterator >
220 void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) {
221 if ( idx == idxEnd ) return;
222 Expression * index = *idx++;
223 assert( idx != idxEnd );
224 Expression * dimension = *idx++;
225
226 // xxx - may want to eventually issue a warning here if we can detect
227 // that the number of elements exceeds to dimension of the array
228 if ( idx == idxEnd ) {
229 if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) {
230 for ( Initializer * init : *listInit ) {
231 buildCallExpr( callExpr->clone(), index, dimension, init, out );
232 }
233 } else {
234 buildCallExpr( callExpr->clone(), index, dimension, init, out );
235 }
236 } else {
237 std::list< Statement * > branches;
238
239 unsigned long cond = 0;
240 ListInit * listInit = dynamic_cast< ListInit * >( init );
241 if ( ! listInit ) {
242 // xxx - this shouldn't be an error, but need a way to
243 // terminate without creating output, so should catch this error
244 SemanticError( init->location, "unbalanced list initializers" );
245 }
246
247 static UniqueName targetLabel( "L__autogen__" );
248 Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } );
249 for ( Initializer * init : *listInit ) {
250 Expression * condition;
251 // check for designations
252 // if ( init-> ) {
253 condition = new ConstantExpr( Constant::from_ulong( cond ) );
254 ++cond;
255 // } else {
256 // condition = // ... take designation
257 // cond = // ... take designation+1
258 // }
259 std::list< Statement * > stmts;
260 build( callExpr, idx, idxEnd, init, back_inserter( stmts ) );
261 stmts.push_back( new BranchStmt( switchLabel, BranchStmt::Break ) );
262 CaseStmt * caseStmt = new CaseStmt( condition, stmts );
263 branches.push_back( caseStmt );
264 }
265 *out++ = new SwitchStmt( index->clone(), branches );
266 *out++ = new NullStmt( { switchLabel } );
267 }
268 }
269 }
270
271 // if array came with an initializer list: initialize each element
272 // may have more initializers than elements in the array - need to check at each index that
273 // we haven't exceeded size.
274 // may have fewer initializers than elements in the array - need to default construct
275 // remaining elements.
276 // To accomplish this, generate switch statement, consuming all of expander's elements
277 Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) {
278 if ( ! init ) return nullptr;
279 CompoundStmt * block = new CompoundStmt();
280 build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) );
281 if ( block->get_kids().empty() ) {
282 delete block;
283 return nullptr;
284 } else {
285 init = nullptr; // init was consumed in creating the list init
286 return block;
287 }
288 }
289
290 Statement * ExprImpl::buildListInit( UntypedExpr *, std::list< Expression * > & ) {
291 return nullptr;
292 }
293
294 Statement * InitExpander::buildListInit( UntypedExpr * dst ) {
295 return expander->buildListInit( dst, indices );
296 }
297
298 Type * getTypeofThis( FunctionType * ftype ) {
299 assertf( ftype, "getTypeofThis: nullptr ftype" );
300 ObjectDecl * thisParam = getParamThis( ftype );
301 ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( thisParam->type );
302 return refType->base;
303 }
304
305 ObjectDecl * getParamThis( FunctionType * ftype ) {
306 assertf( ftype, "getParamThis: nullptr ftype" );
307 auto & params = ftype->parameters;
308 assertf( ! params.empty(), "getParamThis: ftype with 0 parameters: %s", toString( ftype ).c_str() );
309 return strict_dynamic_cast< ObjectDecl * >( params.front() );
310 }
311
312 bool tryConstruct( DeclarationWithType * dwt ) {
313 ObjectDecl * objDecl = dynamic_cast< ObjectDecl * >( dwt );
314 if ( ! objDecl ) return false;
315 return (objDecl->get_init() == nullptr ||
316 ( objDecl->get_init() != nullptr && objDecl->get_init()->get_maybeConstructed() ))
317 && ! objDecl->get_storageClasses().is_extern
318 && isConstructable( objDecl->type );
319 }
320
321 bool isConstructable( Type * type ) {
322 return ! dynamic_cast< VarArgsType * >( type ) && ! dynamic_cast< ReferenceType * >( type ) && ! dynamic_cast< FunctionType * >( type ) && ! Tuples::isTtype( type );
323 }
324
325 struct CallFinder_old {
326 CallFinder_old( const std::list< std::string > & names ) : names( names ) {}
327
328 void postvisit( ApplicationExpr * appExpr ) {
329 handleCallExpr( appExpr );
330 }
331
332 void postvisit( UntypedExpr * untypedExpr ) {
333 handleCallExpr( untypedExpr );
334 }
335
336 std::list< Expression * > * matches;
337 private:
338 const std::list< std::string > names;
339
340 template< typename CallExpr >
341 void handleCallExpr( CallExpr * expr ) {
342 std::string fname = getFunctionName( expr );
343 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {
344 matches->push_back( expr );
345 }
346 }
347 };
348
349 struct CallFinder_new final {
350 std::vector< ast::ptr< ast::Expr > > matches;
351 const std::vector< std::string > names;
352
353 CallFinder_new( std::vector< std::string > && ns ) : matches(), names( std::move(ns) ) {}
354
355 void handleCallExpr( const ast::Expr * expr ) {
356 std::string fname = getFunctionName( expr );
357 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {
358 matches.emplace_back( expr );
359 }
360 }
361
362 void postvisit( const ast::ApplicationExpr * expr ) { handleCallExpr( expr ); }
363 void postvisit( const ast::UntypedExpr * expr ) { handleCallExpr( expr ); }
364 };
365
366 void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) {
367 static PassVisitor<CallFinder_old> finder( std::list< std::string >{ "?{}", "^?{}" } );
368 finder.pass.matches = &matches;
369 maybeAccept( stmt, finder );
370 }
371
372 std::vector< ast::ptr< ast::Expr > > collectCtorDtorCalls( const ast::Stmt * stmt ) {
373 ast::Pass< CallFinder_new > finder{ std::vector< std::string >{ "?{}", "^?{}" } };
374 maybe_accept( stmt, finder );
375 return std::move( finder.pass.matches );
376 }
377
378 Expression * getCtorDtorCall( Statement * stmt ) {
379 std::list< Expression * > matches;
380 collectCtorDtorCalls( stmt, matches );
381 assertf( matches.size() <= 1, "%zd constructor/destructors found in %s", matches.size(), toString( stmt ).c_str() );
382 return matches.size() == 1 ? matches.front() : nullptr;
383 }
384
385 namespace {
386 DeclarationWithType * getCalledFunction( Expression * expr );
387 const ast::DeclWithType * getCalledFunction( const ast::Expr * expr );
388
389 template<typename CallExpr>
390 DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) {
391 // (*f)(x) => should get "f"
392 std::string name = getFunctionName( expr );
393 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
394 assertf( ! expr->get_args().empty(), "Cannot get called function from dereference with no arguments" );
395 return getCalledFunction( expr->get_args().front() );
396 }
397
398 template<typename CallExpr>
399 const ast::DeclWithType * handleDerefCalledFunction( const CallExpr * expr ) {
400 // (*f)(x) => should get "f"
401 std::string name = getFunctionName( expr );
402 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
403 assertf( ! expr->args.empty(), "Cannot get called function from dereference with no arguments" );
404 return getCalledFunction( expr->args.front() );
405 }
406
407
408 DeclarationWithType * getCalledFunction( Expression * expr ) {
409 assert( expr );
410 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
411 return varExpr->var;
412 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) {
413 return memberExpr->member;
414 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
415 return getCalledFunction( castExpr->arg );
416 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) {
417 return handleDerefCalledFunction( untypedExpr );
418 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {
419 return handleDerefCalledFunction( appExpr );
420 } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) {
421 return getCalledFunction( addrExpr->arg );
422 } else if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( expr ) ) {
423 return getCalledFunction( commaExpr->arg2 );
424 }
425 return nullptr;
426 }
427
428 const ast::DeclWithType * getCalledFunction( const ast::Expr * expr ) {
429 assert( expr );
430 if ( const ast::VariableExpr * varExpr = dynamic_cast< const ast::VariableExpr * >( expr ) ) {
431 return varExpr->var;
432 } else if ( const ast::MemberExpr * memberExpr = dynamic_cast< const ast::MemberExpr * >( expr ) ) {
433 return memberExpr->member;
434 } else if ( const ast::CastExpr * castExpr = dynamic_cast< const ast::CastExpr * >( expr ) ) {
435 return getCalledFunction( castExpr->arg );
436 } else if ( const ast::UntypedExpr * untypedExpr = dynamic_cast< const ast::UntypedExpr * >( expr ) ) {
437 return handleDerefCalledFunction( untypedExpr );
438 } else if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * > ( expr ) ) {
439 return handleDerefCalledFunction( appExpr );
440 } else if ( const ast::AddressExpr * addrExpr = dynamic_cast< const ast::AddressExpr * >( expr ) ) {
441 return getCalledFunction( addrExpr->arg );
442 } else if ( const ast::CommaExpr * commaExpr = dynamic_cast< const ast::CommaExpr * >( expr ) ) {
443 return getCalledFunction( commaExpr->arg2 );
444 }
445 return nullptr;
446 }
447 }
448
449 DeclarationWithType * getFunction( Expression * expr ) {
450 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
451 return getCalledFunction( appExpr->get_function() );
452 } else if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * > ( expr ) ) {
453 return getCalledFunction( untyped->get_function() );
454 }
455 assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() );
456 }
457
458 const ast::DeclWithType * getFunction( const ast::Expr * expr ) {
459 if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * >( expr ) ) {
460 return getCalledFunction( appExpr->func );
461 } else if ( const ast::UntypedExpr * untyped = dynamic_cast< const ast::UntypedExpr * > ( expr ) ) {
462 return getCalledFunction( untyped->func );
463 }
464 assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() );
465 }
466
467 ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) {
468 ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr );
469 if ( ! appExpr ) return nullptr;
470 DeclarationWithType * function = getCalledFunction( appExpr->get_function() );
471 assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() );
472 // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor
473 // will call all member dtors, and some members may have a user defined dtor.
474 return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : nullptr;
475 }
476
477 const ast::ApplicationExpr * isIntrinsicCallExpr( const ast::Expr * expr ) {
478 auto appExpr = dynamic_cast< const ast::ApplicationExpr * >( expr );
479 if ( ! appExpr ) return nullptr;
480
481 const ast::DeclWithType * func = getCalledFunction( appExpr->func );
482 assertf( func,
483 "getCalledFunction returned nullptr: %s", toString( appExpr->func ).c_str() );
484
485 // check for Intrinsic only -- don't want to remove all overridable ctor/dtor because
486 // autogenerated ctor/dtor will call all member dtors, and some members may have a
487 // user-defined dtor
488 return func->linkage == ast::Linkage::Intrinsic ? appExpr : nullptr;
489 }
490
491 namespace {
492 template <typename Predicate>
493 bool allofCtorDtor( Statement * stmt, const Predicate & pred ) {
494 std::list< Expression * > callExprs;
495 collectCtorDtorCalls( stmt, callExprs );
496 // if ( callExprs.empty() ) return false; // xxx - do I still need this check?
497 return std::all_of( callExprs.begin(), callExprs.end(), pred);
498 }
499
500 template <typename Predicate>
501 bool allofCtorDtor( const ast::Stmt * stmt, const Predicate & pred ) {
502 std::vector< ast::ptr< ast::Expr > > callExprs = collectCtorDtorCalls( stmt );
503 return std::all_of( callExprs.begin(), callExprs.end(), pred );
504 }
505 }
506
507 bool isIntrinsicSingleArgCallStmt( Statement * stmt ) {
508 return allofCtorDtor( stmt, []( Expression * callExpr ){
509 if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {
510 FunctionType *funcType = GenPoly::getFunctionType( appExpr->function->result );
511 assert( funcType );
512 return funcType->get_parameters().size() == 1;
513 }
514 return false;
515 });
516 }
517
518 bool isIntrinsicSingleArgCallStmt( const ast::Stmt * stmt ) {
519 return allofCtorDtor( stmt, []( const ast::Expr * callExpr ){
520 if ( const ast::ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {
521 const ast::FunctionType * funcType =
522 GenPoly::getFunctionType( appExpr->func->result );
523 assert( funcType );
524 return funcType->params.size() == 1;
525 }
526 return false;
527 });
528 }
529
530 bool isIntrinsicCallStmt( Statement * stmt ) {
531 return allofCtorDtor( stmt, []( Expression * callExpr ) {
532 return isIntrinsicCallExpr( callExpr );
533 });
534 }
535
536 namespace {
537 template<typename CallExpr>
538 Expression *& callArg( CallExpr * callExpr, unsigned int pos ) {
539 if ( pos >= callExpr->get_args().size() ) assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.", pos, toString( callExpr ).c_str() );
540 for ( Expression *& arg : callExpr->get_args() ) {
541 if ( pos == 0 ) return arg;
542 pos--;
543 }
544 assert( false );
545 }
546
547 template<typename CallExpr>
548 const ast::Expr * callArg( const CallExpr * call, unsigned int pos ) {
549 if( pos >= call->args.size() ) {
550 assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.",
551 pos, toString( call ).c_str() );
552 }
553 for ( const ast::Expr * arg : call->args ) {
554 if ( pos == 0 ) return arg;
555 --pos;
556 }
557 assert( false );
558 }
559 }
560
561 Expression *& getCallArg( Expression * callExpr, unsigned int pos ) {
562 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) {
563 return callArg( appExpr, pos );
564 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) {
565 return callArg( untypedExpr, pos );
566 } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) {
567 std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids();
568 assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." );
569 ExprStmt * stmt = strict_dynamic_cast< ExprStmt * >( stmts.back() );
570 TupleExpr * tuple = strict_dynamic_cast< TupleExpr * >( stmt->get_expr() );
571 assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." );
572 return getCallArg( tuple->get_exprs().front(), pos );
573 } else if ( ImplicitCopyCtorExpr * copyCtor = dynamic_cast< ImplicitCopyCtorExpr * >( callExpr ) ) {
574 return getCallArg( copyCtor->callExpr, pos );
575 } else {
576 assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() );
577 }
578 }
579
580 const ast::Expr * getCallArg( const ast::Expr * call, unsigned pos ) {
581 if ( auto app = dynamic_cast< const ast::ApplicationExpr * >( call ) ) {
582 return callArg( app, pos );
583 } else if ( auto untyped = dynamic_cast< const ast::UntypedExpr * >( call ) ) {
584 return callArg( untyped, pos );
585 } else if ( auto tupleAssn = dynamic_cast< const ast::TupleAssignExpr * >( call ) ) {
586 const std::list<ast::ptr<ast::Stmt>>& stmts = tupleAssn->stmtExpr->stmts->kids;
587 assertf( ! stmts.empty(), "TupleAssignExpr missing statements." );
588 auto stmt = strict_dynamic_cast< const ast::ExprStmt * >( stmts.back().get() );
589 auto tuple = strict_dynamic_cast< const ast::TupleExpr * >( stmt->expr.get() );
590 assertf( ! tuple->exprs.empty(), "TupleAssignExpr has empty tuple expr.");
591 return getCallArg( tuple->exprs.front(), pos );
592 } else if ( auto ctor = dynamic_cast< const ast::ImplicitCopyCtorExpr * >( call ) ) {
593 return getCallArg( ctor->callExpr, pos );
594 } else {
595 assertf( false, "Unexpected expression type passed to getCallArg: %s",
596 toString( call ).c_str() );
597 }
598 }
599
600 namespace {
601 std::string funcName( Expression * func );
602 std::string funcName( const ast::Expr * func );
603
604 template<typename CallExpr>
605 std::string handleDerefName( CallExpr * expr ) {
606 // (*f)(x) => should get name "f"
607 std::string name = getFunctionName( expr );
608 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
609 assertf( ! expr->get_args().empty(), "Cannot get function name from dereference with no arguments" );
610 return funcName( expr->get_args().front() );
611 }
612
613 template<typename CallExpr>
614 std::string handleDerefName( const CallExpr * expr ) {
615 // (*f)(x) => should get name "f"
616 std::string name = getFunctionName( expr );
617 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
618 assertf( ! expr->args.empty(), "Cannot get function name from dereference with no arguments" );
619 return funcName( expr->args.front() );
620 }
621
622 std::string funcName( Expression * func ) {
623 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) {
624 return nameExpr->get_name();
625 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) {
626 return varExpr->get_var()->get_name();
627 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) {
628 return funcName( castExpr->get_arg() );
629 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) {
630 return memberExpr->get_member()->get_name();
631 } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) {
632 return funcName( memberExpr->get_member() );
633 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) {
634 return handleDerefName( untypedExpr );
635 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) {
636 return handleDerefName( appExpr );
637 } else if ( ConstructorExpr * ctorExpr = dynamic_cast< ConstructorExpr * >( func ) ) {
638 return funcName( getCallArg( ctorExpr->get_callExpr(), 0 ) );
639 } else {
640 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );
641 }
642 }
643
644 std::string funcName( const ast::Expr * func ) {
645 if ( const ast::NameExpr * nameExpr = dynamic_cast< const ast::NameExpr * >( func ) ) {
646 return nameExpr->name;
647 } else if ( const ast::VariableExpr * varExpr = dynamic_cast< const ast::VariableExpr * >( func ) ) {
648 return varExpr->var->name;
649 } else if ( const ast::CastExpr * castExpr = dynamic_cast< const ast::CastExpr * >( func ) ) {
650 return funcName( castExpr->arg );
651 } else if ( const ast::MemberExpr * memberExpr = dynamic_cast< const ast::MemberExpr * >( func ) ) {
652 return memberExpr->member->name;
653 } else if ( const ast::UntypedMemberExpr * memberExpr = dynamic_cast< const ast::UntypedMemberExpr * > ( func ) ) {
654 return funcName( memberExpr->member );
655 } else if ( const ast::UntypedExpr * untypedExpr = dynamic_cast< const ast::UntypedExpr * >( func ) ) {
656 return handleDerefName( untypedExpr );
657 } else if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * >( func ) ) {
658 return handleDerefName( appExpr );
659 } else if ( const ast::ConstructorExpr * ctorExpr = dynamic_cast< const ast::ConstructorExpr * >( func ) ) {
660 return funcName( getCallArg( ctorExpr->callExpr, 0 ) );
661 } else {
662 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );
663 }
664 }
665 }
666
667 std::string getFunctionName( Expression * expr ) {
668 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and
669 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction
670 // can't possibly do anything reasonable.
671 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
672 return funcName( appExpr->get_function() );
673 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) {
674 return funcName( untypedExpr->get_function() );
675 } else {
676 std::cerr << expr << std::endl;
677 assertf( false, "Unexpected expression type passed to getFunctionName" );
678 }
679 }
680
681 std::string getFunctionName( const ast::Expr * expr ) {
682 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and
683 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction
684 // can't possibly do anything reasonable.
685 if ( const ast::ApplicationExpr * appExpr = dynamic_cast< const ast::ApplicationExpr * >( expr ) ) {
686 return funcName( appExpr->func );
687 } else if ( const ast::UntypedExpr * untypedExpr = dynamic_cast< const ast::UntypedExpr * > ( expr ) ) {
688 return funcName( untypedExpr->func );
689 } else {
690 std::cerr << expr << std::endl;
691 assertf( false, "Unexpected expression type passed to getFunctionName" );
692 }
693 }
694
695 Type * getPointerBase( Type * type ) {
696 if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) {
697 return ptrType->get_base();
698 } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
699 return arrayType->get_base();
700 } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {
701 return refType->get_base();
702 } else {
703 return nullptr;
704 }
705 }
706 const ast::Type* getPointerBase( const ast::Type* t ) {
707 if ( const auto * p = dynamic_cast< const ast::PointerType * >( t ) ) {
708 return p->base;
709 } else if ( const auto * a = dynamic_cast< const ast::ArrayType * >( t ) ) {
710 return a->base;
711 } else if ( const auto * r = dynamic_cast< const ast::ReferenceType * >( t ) ) {
712 return r->base;
713 } else return nullptr;
714 }
715
716 Type * isPointerType( Type * type ) {
717 if ( getPointerBase( type ) ) return type;
718 else return nullptr;
719 }
720
721 ApplicationExpr * createBitwiseAssignment( Expression * dst, Expression * src ) {
722 static FunctionDecl * assign = nullptr;
723 if ( ! assign ) {
724 // temporary? Generate a fake assignment operator to represent bitwise assignments.
725 // This operator could easily exist as a real function, but it's tricky because nothing should resolve to this function.
726 TypeDecl * td = new TypeDecl( "T", noStorageClasses, nullptr, TypeDecl::Dtype, true );
727 assign = new FunctionDecl( "?=?", noStorageClasses, LinkageSpec::Intrinsic, SymTab::genAssignType( new TypeInstType( noQualifiers, td->name, td ) ), nullptr );
728 }
729 if ( dynamic_cast< ReferenceType * >( dst->result ) ) {
730 for (int depth = dst->result->referenceDepth(); depth > 0; depth--) {
731 dst = new AddressExpr( dst );
732 }
733 } else {
734 dst = new CastExpr( dst, new ReferenceType( noQualifiers, dst->result->clone() ) );
735 }
736 if ( dynamic_cast< ReferenceType * >( src->result ) ) {
737 for (int depth = src->result->referenceDepth(); depth > 0; depth--) {
738 src = new AddressExpr( src );
739 }
740 // src = new CastExpr( src, new ReferenceType( noQualifiers, src->result->stripReferences()->clone() ) );
741 }
742 return new ApplicationExpr( VariableExpr::functionPointer( assign ), { dst, src } );
743 }
744
745 struct ConstExprChecker : public WithShortCircuiting {
746 // most expressions are not const expr
747 void previsit( Expression * ) { isConstExpr = false; visit_children = false; }
748
749 void previsit( AddressExpr *addressExpr ) {
750 visit_children = false;
751
752 // address of a variable or member expression is constexpr
753 Expression * arg = addressExpr->get_arg();
754 if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false;
755 }
756
757 // these expressions may be const expr, depending on their children
758 void previsit( SizeofExpr * ) {}
759 void previsit( AlignofExpr * ) {}
760 void previsit( UntypedOffsetofExpr * ) {}
761 void previsit( OffsetofExpr * ) {}
762 void previsit( OffsetPackExpr * ) {}
763 void previsit( AttrExpr * ) {}
764 void previsit( CommaExpr * ) {}
765 void previsit( LogicalExpr * ) {}
766 void previsit( ConditionalExpr * ) {}
767 void previsit( CastExpr * ) {}
768 void previsit( ConstantExpr * ) {}
769
770 void previsit( VariableExpr * varExpr ) {
771 visit_children = false;
772
773 if ( EnumInstType * inst = dynamic_cast< EnumInstType * >( varExpr->result ) ) {
774 long long int value;
775 if ( inst->baseEnum->valueOf( varExpr->var, value ) ) {
776 // enumerators are const expr
777 return;
778 }
779 }
780 isConstExpr = false;
781 }
782
783 bool isConstExpr = true;
784 };
785
786 bool isConstExpr( Expression * expr ) {
787 if ( expr ) {
788 PassVisitor<ConstExprChecker> checker;
789 expr->accept( checker );
790 return checker.pass.isConstExpr;
791 }
792 return true;
793 }
794
795 bool isConstExpr( Initializer * init ) {
796 if ( init ) {
797 PassVisitor<ConstExprChecker> checker;
798 init->accept( checker );
799 return checker.pass.isConstExpr;
800 } // if
801 // for all intents and purposes, no initializer means const expr
802 return true;
803 }
804
805 bool isConstructor( const std::string & str ) { return str == "?{}"; }
806 bool isDestructor( const std::string & str ) { return str == "^?{}"; }
807 bool isAssignment( const std::string & str ) { return str == "?=?"; }
808 bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); }
809 bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); }
810
811 FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) {
812 FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl );
813 if ( ! function ) return nullptr;
814 if ( function->name != fname ) return nullptr;
815 FunctionType * ftype = function->type;
816 if ( ftype->parameters.size() != 2 ) return nullptr;
817
818 Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() );
819 Type * t2 = ftype->parameters.back()->get_type();
820 assert( t1 );
821
822 if ( ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, SymTab::Indexer() ) ) {
823 return function;
824 } else {
825 return nullptr;
826 }
827 }
828
829 bool isCopyFunction( const ast::FunctionDecl * decl ) {
830 const ast::FunctionType * ftype = decl->type;
831 if ( ftype->params.size() != 2 ) return false;
832
833 const ast::Type * t1 = getPointerBase( ftype->params.front()->get_type() );
834 if ( ! t1 ) return false;
835 const ast::Type * t2 = ftype->params.back()->get_type();
836
837 return ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, ast::SymbolTable{} );
838 }
839
840 FunctionDecl * isAssignment( Declaration * decl ) {
841 return isCopyFunction( decl, "?=?" );
842 }
843 FunctionDecl * isDestructor( Declaration * decl ) {
844 if ( isDestructor( decl->get_name() ) ) {
845 return dynamic_cast< FunctionDecl * >( decl );
846 }
847 return nullptr;
848 }
849 FunctionDecl * isDefaultConstructor( Declaration * decl ) {
850 if ( isConstructor( decl->name ) ) {
851 if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) {
852 if ( func->type->parameters.size() == 1 ) {
853 return func;
854 }
855 }
856 }
857 return nullptr;
858 }
859 FunctionDecl * isCopyConstructor( Declaration * decl ) {
860 return isCopyFunction( decl, "?{}" );
861 }
862}
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