source: src/InitTweak/InitTweak.cc@ 1f370451

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since 1f370451 was 0fe4e62, checked in by Rob Schluntz <rschlunt@…>, 8 years ago

Merge branch 'master' into fix-bug-51
  • Property mode set to 100644
File size: 24.8 KB
Line 
1#include <algorithm> // for find, all_of
2#include <cassert> // for assertf, assert, strict_dynamic_cast
3#include <iostream> // for ostream, cerr, endl
4#include <iterator> // for back_insert_iterator, back_inserter
5#include <memory> // for __shared_ptr
6
7#include "Common/SemanticError.h" // for SemanticError
8#include "Common/UniqueName.h" // for UniqueName
9#include "Common/utility.h" // for toString, deleteAll, maybeClone
10#include "GenPoly/GenPoly.h" // for getFunctionType
11#include "InitTweak.h"
12#include "Parser/LinkageSpec.h" // for Spec, isBuiltin, Intrinsic
13#include "ResolvExpr/typeops.h" // for typesCompatibleIgnoreQualifiers
14#include "SymTab/Autogen.h"
15#include "SymTab/Indexer.h" // for Indexer
16#include "SynTree/Attribute.h" // for Attribute
17#include "SynTree/Constant.h" // for Constant
18#include "SynTree/Declaration.h" // for ObjectDecl, DeclarationWithType
19#include "SynTree/Expression.h" // for Expression, UntypedExpr, Applicati...
20#include "SynTree/Initializer.h" // for Initializer, ListInit, Designation
21#include "SynTree/Label.h" // for Label, noLabels
22#include "SynTree/Statement.h" // for CompoundStmt, ExprStmt, BranchStmt
23#include "SynTree/Type.h" // for FunctionType, ArrayType, PointerType
24#include "SynTree/Visitor.h" // for Visitor, maybeAccept
25#include "Tuples/Tuples.h" // for Tuples::isTtype
26
27class UntypedValofExpr;
28
29namespace InitTweak {
30 namespace {
31 class HasDesignations : public Visitor {
32 public:
33 bool hasDesignations = false;
34 virtual void visit( Designation * des ) {
35 if ( ! des->get_designators().empty() ) hasDesignations = true;
36 else Visitor::visit( des );
37 }
38 };
39
40 class InitDepthChecker : public Visitor {
41 public:
42 bool depthOkay = true;
43 Type * type;
44 int curDepth = 0, maxDepth = 0;
45 InitDepthChecker( Type * type ) : type( type ) {
46 Type * t = type;
47 while ( ArrayType * at = dynamic_cast< ArrayType * >( t ) ) {
48 maxDepth++;
49 t = at->get_base();
50 }
51 maxDepth++;
52 }
53 virtual void visit( ListInit * listInit ) {
54 curDepth++;
55 if ( curDepth > maxDepth ) depthOkay = false;
56 Visitor::visit( listInit );
57 curDepth--;
58 }
59 };
60
61 class InitFlattener : public Visitor {
62 public:
63 virtual void visit( SingleInit * singleInit );
64 virtual void visit( ListInit * listInit );
65 std::list< Expression * > argList;
66 };
67
68 void InitFlattener::visit( SingleInit * singleInit ) {
69 argList.push_back( singleInit->get_value()->clone() );
70 }
71
72 void InitFlattener::visit( ListInit * listInit ) {
73 // flatten nested list inits
74 std::list<Initializer*>::iterator it = listInit->begin();
75 for ( ; it != listInit->end(); ++it ) {
76 (*it)->accept( *this );
77 }
78 }
79 }
80
81 std::list< Expression * > makeInitList( Initializer * init ) {
82 InitFlattener flattener;
83 maybeAccept( init, flattener );
84 return flattener.argList;
85 }
86
87 bool isDesignated( Initializer * init ) {
88 HasDesignations finder;
89 maybeAccept( init, finder );
90 return finder.hasDesignations;
91 }
92
93 bool checkInitDepth( ObjectDecl * objDecl ) {
94 InitDepthChecker checker( objDecl->get_type() );
95 maybeAccept( objDecl->get_init(), checker );
96 return checker.depthOkay;
97 }
98
99 class InitExpander::ExpanderImpl {
100 public:
101 virtual ~ExpanderImpl() = default;
102 virtual std::list< Expression * > next( std::list< Expression * > & indices ) = 0;
103 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices ) = 0;
104 };
105
106 class InitImpl : public InitExpander::ExpanderImpl {
107 public:
108 InitImpl( Initializer * init ) : init( init ) {}
109 virtual ~InitImpl() = default;
110
111 virtual std::list< Expression * > next( __attribute((unused)) std::list< Expression * > & indices ) {
112 // this is wrong, but just a placeholder for now
113 // if ( ! flattened ) flatten( indices );
114 // return ! inits.empty() ? makeInitList( inits.front() ) : std::list< Expression * >();
115 return makeInitList( init );
116 }
117
118 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
119 private:
120 Initializer * init;
121 };
122
123 class ExprImpl : public InitExpander::ExpanderImpl {
124 public:
125 ExprImpl( Expression * expr ) : arg( expr ) {}
126 virtual ~ExprImpl() { delete arg; }
127
128 virtual std::list< Expression * > next( std::list< Expression * > & indices ) {
129 std::list< Expression * > ret;
130 Expression * expr = maybeClone( arg );
131 if ( expr ) {
132 for ( std::list< Expression * >::reverse_iterator it = indices.rbegin(); it != indices.rend(); ++it ) {
133 // go through indices and layer on subscript exprs ?[?]
134 ++it;
135 UntypedExpr * subscriptExpr = new UntypedExpr( new NameExpr( "?[?]") );
136 subscriptExpr->get_args().push_back( expr );
137 subscriptExpr->get_args().push_back( (*it)->clone() );
138 expr = subscriptExpr;
139 }
140 ret.push_back( expr );
141 }
142 return ret;
143 }
144
145 virtual Statement * buildListInit( UntypedExpr * callExpr, std::list< Expression * > & indices );
146 private:
147 Expression * arg;
148 };
149
150 InitExpander::InitExpander( Initializer * init ) : expander( new InitImpl( init ) ) {}
151
152 InitExpander::InitExpander( Expression * expr ) : expander( new ExprImpl( expr ) ) {}
153
154 std::list< Expression * > InitExpander::operator*() {
155 return cur;
156 }
157
158 InitExpander & InitExpander::operator++() {
159 cur = expander->next( indices );
160 return *this;
161 }
162
163 // use array indices list to build switch statement
164 void InitExpander::addArrayIndex( Expression * index, Expression * dimension ) {
165 indices.push_back( index );
166 indices.push_back( dimension );
167 }
168
169 void InitExpander::clearArrayIndices() {
170 deleteAll( indices );
171 indices.clear();
172 }
173
174 bool InitExpander::addReference() {
175 bool added = false;
176 for ( Expression *& expr : cur ) {
177 expr = new AddressExpr( expr );
178 added = true;
179 }
180 return added;
181 }
182
183 namespace {
184 /// given index i, dimension d, initializer init, and callExpr f, generates
185 /// if (i < d) f(..., init)
186 /// ++i;
187 /// so that only elements within the range of the array are constructed
188 template< typename OutIterator >
189 void buildCallExpr( UntypedExpr * callExpr, Expression * index, Expression * dimension, Initializer * init, OutIterator out ) {
190 UntypedExpr * cond = new UntypedExpr( new NameExpr( "?<?") );
191 cond->get_args().push_back( index->clone() );
192 cond->get_args().push_back( dimension->clone() );
193
194 std::list< Expression * > args = makeInitList( init );
195 callExpr->get_args().splice( callExpr->get_args().end(), args );
196
197 *out++ = new IfStmt( noLabels, cond, new ExprStmt( noLabels, callExpr ), nullptr );
198
199 UntypedExpr * increment = new UntypedExpr( new NameExpr( "++?" ) );
200 increment->get_args().push_back( index->clone() );
201 *out++ = new ExprStmt( noLabels, increment );
202 }
203
204 template< typename OutIterator >
205 void build( UntypedExpr * callExpr, InitExpander::IndexList::iterator idx, InitExpander::IndexList::iterator idxEnd, Initializer * init, OutIterator out ) {
206 if ( idx == idxEnd ) return;
207 Expression * index = *idx++;
208 assert( idx != idxEnd );
209 Expression * dimension = *idx++;
210
211 // xxx - may want to eventually issue a warning here if we can detect
212 // that the number of elements exceeds to dimension of the array
213 if ( idx == idxEnd ) {
214 if ( ListInit * listInit = dynamic_cast< ListInit * >( init ) ) {
215 for ( Initializer * init : *listInit ) {
216 buildCallExpr( callExpr->clone(), index, dimension, init, out );
217 }
218 } else {
219 buildCallExpr( callExpr->clone(), index, dimension, init, out );
220 }
221 } else {
222 std::list< Statement * > branches;
223
224 unsigned long cond = 0;
225 ListInit * listInit = dynamic_cast< ListInit * >( init );
226 if ( ! listInit ) {
227 // xxx - this shouldn't be an error, but need a way to
228 // terminate without creating output, so should catch this error
229 throw SemanticError( "unbalanced list initializers" );
230 }
231
232 static UniqueName targetLabel( "L__autogen__" );
233 Label switchLabel( targetLabel.newName(), 0, std::list< Attribute * >{ new Attribute("unused") } );
234 for ( Initializer * init : *listInit ) {
235 Expression * condition;
236 // check for designations
237 // if ( init-> ) {
238 condition = new ConstantExpr( Constant::from_ulong( cond ) );
239 ++cond;
240 // } else {
241 // condition = // ... take designation
242 // cond = // ... take designation+1
243 // }
244 std::list< Statement * > stmts;
245 build( callExpr, idx, idxEnd, init, back_inserter( stmts ) );
246 stmts.push_back( new BranchStmt( noLabels, switchLabel, BranchStmt::Break ) );
247 CaseStmt * caseStmt = new CaseStmt( noLabels, condition, stmts );
248 branches.push_back( caseStmt );
249 }
250 *out++ = new SwitchStmt( noLabels, index->clone(), branches );
251 *out++ = new NullStmt( std::list<Label>{ switchLabel } );
252 }
253 }
254 }
255
256 // if array came with an initializer list: initialize each element
257 // may have more initializers than elements in the array - need to check at each index that
258 // we haven't exceeded size.
259 // may have fewer initializers than elements in the array - need to default construct
260 // remaining elements.
261 // To accomplish this, generate switch statement, consuming all of expander's elements
262 Statement * InitImpl::buildListInit( UntypedExpr * dst, std::list< Expression * > & indices ) {
263 if ( ! init ) return nullptr;
264 CompoundStmt * block = new CompoundStmt( noLabels );
265 build( dst, indices.begin(), indices.end(), init, back_inserter( block->get_kids() ) );
266 if ( block->get_kids().empty() ) {
267 delete block;
268 return nullptr;
269 } else {
270 init = nullptr; // init was consumed in creating the list init
271 return block;
272 }
273 }
274
275 Statement * ExprImpl::buildListInit( UntypedExpr *, std::list< Expression * > & ) {
276 return nullptr;
277 }
278
279 Statement * InitExpander::buildListInit( UntypedExpr * dst ) {
280 return expander->buildListInit( dst, indices );
281 }
282
283 Type * getTypeofThis( FunctionType * ftype ) {
284 assertf( ftype, "getTypeofThis: nullptr ftype" );
285 ObjectDecl * thisParam = getParamThis( ftype );
286 ReferenceType * refType = strict_dynamic_cast< ReferenceType * >( thisParam->type );
287 return refType->base;
288 }
289
290 ObjectDecl * getParamThis( FunctionType * ftype ) {
291 assertf( ftype, "getParamThis: nullptr ftype" );
292 auto & params = ftype->parameters;
293 assertf( ! params.empty(), "getParamThis: ftype with 0 parameters: %s", toString( ftype ).c_str() );
294 return strict_dynamic_cast< ObjectDecl * >( params.front() );
295 }
296
297 bool tryConstruct( DeclarationWithType * dwt ) {
298 ObjectDecl * objDecl = dynamic_cast< ObjectDecl * >( dwt );
299 if ( ! objDecl ) return false;
300 return ! LinkageSpec::isBuiltin( objDecl->get_linkage() ) &&
301 (objDecl->get_init() == nullptr ||
302 ( objDecl->get_init() != nullptr && objDecl->get_init()->get_maybeConstructed() ))
303 && ! objDecl->get_storageClasses().is_extern
304 && isConstructable( objDecl->type );
305 }
306
307 bool isConstructable( Type * type ) {
308 return ! dynamic_cast< VarArgsType * >( type ) && ! dynamic_cast< ReferenceType * >( type ) && ! dynamic_cast< FunctionType * >( type ) && ! Tuples::isTtype( type );
309 }
310
311 class CallFinder : public Visitor {
312 public:
313 typedef Visitor Parent;
314 CallFinder( const std::list< std::string > & names ) : names( names ) {}
315
316 virtual void visit( ApplicationExpr * appExpr ) {
317 handleCallExpr( appExpr );
318 }
319
320 virtual void visit( UntypedExpr * untypedExpr ) {
321 handleCallExpr( untypedExpr );
322 }
323
324 std::list< Expression * > * matches;
325 private:
326 const std::list< std::string > names;
327
328 template< typename CallExpr >
329 void handleCallExpr( CallExpr * expr ) {
330 Parent::visit( expr );
331 std::string fname = getFunctionName( expr );
332 if ( std::find( names.begin(), names.end(), fname ) != names.end() ) {
333 matches->push_back( expr );
334 }
335 }
336 };
337
338 void collectCtorDtorCalls( Statement * stmt, std::list< Expression * > & matches ) {
339 static CallFinder finder( std::list< std::string >{ "?{}", "^?{}" } );
340 finder.matches = &matches;
341 maybeAccept( stmt, finder );
342 }
343
344 Expression * getCtorDtorCall( Statement * stmt ) {
345 std::list< Expression * > matches;
346 collectCtorDtorCalls( stmt, matches );
347 assert( matches.size() <= 1 );
348 return matches.size() == 1 ? matches.front() : nullptr;
349 }
350
351 namespace {
352 DeclarationWithType * getCalledFunction( Expression * expr );
353
354 template<typename CallExpr>
355 DeclarationWithType * handleDerefCalledFunction( CallExpr * expr ) {
356 // (*f)(x) => should get "f"
357 std::string name = getFunctionName( expr );
358 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
359 assertf( ! expr->get_args().empty(), "Cannot get called function from dereference with no arguments" );
360 return getCalledFunction( expr->get_args().front() );
361 }
362
363 DeclarationWithType * getCalledFunction( Expression * expr ) {
364 assert( expr );
365 if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( expr ) ) {
366 return varExpr->var;
367 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( expr ) ) {
368 return memberExpr->member;
369 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( expr ) ) {
370 return getCalledFunction( castExpr->arg );
371 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( expr ) ) {
372 return handleDerefCalledFunction( untypedExpr );
373 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * > ( expr ) ) {
374 return handleDerefCalledFunction( appExpr );
375 } else if ( AddressExpr * addrExpr = dynamic_cast< AddressExpr * >( expr ) ) {
376 return getCalledFunction( addrExpr->arg );
377 } else if ( CommaExpr * commaExpr = dynamic_cast< CommaExpr * >( expr ) ) {
378 return getCalledFunction( commaExpr->arg2 );
379 }
380 return nullptr;
381 }
382 }
383
384 DeclarationWithType * getFunction( Expression * expr ) {
385 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
386 return getCalledFunction( appExpr->get_function() );
387 } else if ( UntypedExpr * untyped = dynamic_cast< UntypedExpr * > ( expr ) ) {
388 return getCalledFunction( untyped->get_function() );
389 }
390 assertf( false, "getFunction received unknown expression: %s", toString( expr ).c_str() );
391 }
392
393 ApplicationExpr * isIntrinsicCallExpr( Expression * expr ) {
394 ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr );
395 if ( ! appExpr ) return nullptr;
396 DeclarationWithType * function = getCalledFunction( appExpr->get_function() );
397 assertf( function, "getCalledFunction returned nullptr: %s", toString( appExpr->get_function() ).c_str() );
398 // check for Intrinsic only - don't want to remove all overridable ctor/dtors because autogenerated ctor/dtor
399 // will call all member dtors, and some members may have a user defined dtor.
400 return function->get_linkage() == LinkageSpec::Intrinsic ? appExpr : nullptr;
401 }
402
403 namespace {
404 template <typename Predicate>
405 bool allofCtorDtor( Statement * stmt, const Predicate & pred ) {
406 std::list< Expression * > callExprs;
407 collectCtorDtorCalls( stmt, callExprs );
408 // if ( callExprs.empty() ) return false; // xxx - do I still need this check?
409 return std::all_of( callExprs.begin(), callExprs.end(), pred);
410 }
411 }
412
413 bool isIntrinsicSingleArgCallStmt( Statement * stmt ) {
414 return allofCtorDtor( stmt, []( Expression * callExpr ){
415 if ( ApplicationExpr * appExpr = isIntrinsicCallExpr( callExpr ) ) {
416 FunctionType *funcType = GenPoly::getFunctionType( appExpr->get_function()->get_result() );
417 assert( funcType );
418 return funcType->get_parameters().size() == 1;
419 }
420 return false;
421 });
422 }
423
424 bool isIntrinsicCallStmt( Statement * stmt ) {
425 return allofCtorDtor( stmt, []( Expression * callExpr ) {
426 return isIntrinsicCallExpr( callExpr );
427 });
428 }
429
430 namespace {
431 template<typename CallExpr>
432 Expression *& callArg( CallExpr * callExpr, unsigned int pos ) {
433 if ( pos >= callExpr->get_args().size() ) assertf( false, "getCallArg for argument that doesn't exist: (%u); %s.", pos, toString( callExpr ).c_str() );
434 for ( Expression *& arg : callExpr->get_args() ) {
435 if ( pos == 0 ) return arg;
436 pos--;
437 }
438 assert( false );
439 }
440 }
441
442 Expression *& getCallArg( Expression * callExpr, unsigned int pos ) {
443 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( callExpr ) ) {
444 return callArg( appExpr, pos );
445 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( callExpr ) ) {
446 return callArg( untypedExpr, pos );
447 } else if ( TupleAssignExpr * tupleExpr = dynamic_cast< TupleAssignExpr * > ( callExpr ) ) {
448 std::list< Statement * > & stmts = tupleExpr->get_stmtExpr()->get_statements()->get_kids();
449 assertf( ! stmts.empty(), "TupleAssignExpr somehow has no statements." );
450 ExprStmt * stmt = strict_dynamic_cast< ExprStmt * >( stmts.back() );
451 TupleExpr * tuple = strict_dynamic_cast< TupleExpr * >( stmt->get_expr() );
452 assertf( ! tuple->get_exprs().empty(), "TupleAssignExpr somehow has empty tuple expr." );
453 return getCallArg( tuple->get_exprs().front(), pos );
454 } else if ( ImplicitCopyCtorExpr * copyCtor = dynamic_cast< ImplicitCopyCtorExpr * >( callExpr ) ) {
455 return getCallArg( copyCtor->callExpr, pos );
456 } else {
457 assertf( false, "Unexpected expression type passed to getCallArg: %s", toString( callExpr ).c_str() );
458 }
459 }
460
461 namespace {
462 std::string funcName( Expression * func );
463
464 template<typename CallExpr>
465 std::string handleDerefName( CallExpr * expr ) {
466 // (*f)(x) => should get name "f"
467 std::string name = getFunctionName( expr );
468 assertf( name == "*?", "Unexpected untyped expression: %s", name.c_str() );
469 assertf( ! expr->get_args().empty(), "Cannot get function name from dereference with no arguments" );
470 return funcName( expr->get_args().front() );
471 }
472
473 std::string funcName( Expression * func ) {
474 if ( NameExpr * nameExpr = dynamic_cast< NameExpr * >( func ) ) {
475 return nameExpr->get_name();
476 } else if ( VariableExpr * varExpr = dynamic_cast< VariableExpr * >( func ) ) {
477 return varExpr->get_var()->get_name();
478 } else if ( CastExpr * castExpr = dynamic_cast< CastExpr * >( func ) ) {
479 return funcName( castExpr->get_arg() );
480 } else if ( MemberExpr * memberExpr = dynamic_cast< MemberExpr * >( func ) ) {
481 return memberExpr->get_member()->get_name();
482 } else if ( UntypedMemberExpr * memberExpr = dynamic_cast< UntypedMemberExpr * > ( func ) ) {
483 return funcName( memberExpr->get_member() );
484 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * >( func ) ) {
485 return handleDerefName( untypedExpr );
486 } else if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( func ) ) {
487 return handleDerefName( appExpr );
488 } else if ( ConstructorExpr * ctorExpr = dynamic_cast< ConstructorExpr * >( func ) ) {
489 return funcName( getCallArg( ctorExpr->get_callExpr(), 0 ) );
490 } else {
491 assertf( false, "Unexpected expression type being called as a function in call expression: %s", toString( func ).c_str() );
492 }
493 }
494 }
495
496 std::string getFunctionName( Expression * expr ) {
497 // there's some unforunate overlap here with getCalledFunction. Ideally this would be able to use getCalledFunction and
498 // return the name of the DeclarationWithType, but this needs to work for NameExpr and UntypedMemberExpr, where getCalledFunction
499 // can't possibly do anything reasonable.
500 if ( ApplicationExpr * appExpr = dynamic_cast< ApplicationExpr * >( expr ) ) {
501 return funcName( appExpr->get_function() );
502 } else if ( UntypedExpr * untypedExpr = dynamic_cast< UntypedExpr * > ( expr ) ) {
503 return funcName( untypedExpr->get_function() );
504 } else {
505 std::cerr << expr << std::endl;
506 assertf( false, "Unexpected expression type passed to getFunctionName" );
507 }
508 }
509
510 Type * getPointerBase( Type * type ) {
511 if ( PointerType * ptrType = dynamic_cast< PointerType * >( type ) ) {
512 return ptrType->get_base();
513 } else if ( ArrayType * arrayType = dynamic_cast< ArrayType * >( type ) ) {
514 return arrayType->get_base();
515 } else if ( ReferenceType * refType = dynamic_cast< ReferenceType * >( type ) ) {
516 return refType->get_base();
517 } else {
518 return nullptr;
519 }
520 }
521
522 Type * isPointerType( Type * type ) {
523 if ( getPointerBase( type ) ) return type;
524 else return nullptr;
525 }
526
527 ApplicationExpr * createBitwiseAssignment( Expression * dst, Expression * src ) {
528 static FunctionDecl * assign = nullptr;
529 if ( ! assign ) {
530 // temporary? Generate a fake assignment operator to represent bitwise assignments.
531 // This operator could easily exist as a real function, but it's tricky because nothing should resolve to this function.
532 TypeDecl * td = new TypeDecl( "T", noStorageClasses, nullptr, TypeDecl::Dtype, true );
533 assign = new FunctionDecl( "?=?", noStorageClasses, LinkageSpec::Intrinsic, SymTab::genAssignType( new TypeInstType( noQualifiers, td->name, td ) ), nullptr );
534 }
535 if ( dynamic_cast< ReferenceType * >( dst->result ) ) {
536 dst = new AddressExpr( dst );
537 } else {
538 dst = new CastExpr( dst, new ReferenceType( noQualifiers, dst->result->clone() ) );
539 }
540 if ( dynamic_cast< ReferenceType * >( src->result ) ) {
541 src = new CastExpr( src, new ReferenceType( noQualifiers, src->result->stripReferences()->clone() ) );
542 }
543 return new ApplicationExpr( VariableExpr::functionPointer( assign ), { dst, src } );
544 }
545
546 class ConstExprChecker : public Visitor {
547 public:
548 ConstExprChecker() : isConstExpr( true ) {}
549
550 using Visitor::visit;
551
552 virtual void visit( ApplicationExpr * ) { isConstExpr = false; }
553 virtual void visit( UntypedExpr * ) { isConstExpr = false; }
554 virtual void visit( NameExpr * ) { isConstExpr = false; }
555 // virtual void visit( CastExpr *castExpr ) { isConstExpr = false; }
556 virtual void visit( AddressExpr *addressExpr ) {
557 // address of a variable or member expression is constexpr
558 Expression * arg = addressExpr->get_arg();
559 if ( ! dynamic_cast< NameExpr * >( arg) && ! dynamic_cast< VariableExpr * >( arg ) && ! dynamic_cast< MemberExpr * >( arg ) && ! dynamic_cast< UntypedMemberExpr * >( arg ) ) isConstExpr = false;
560 }
561 virtual void visit( UntypedMemberExpr * ) { isConstExpr = false; }
562 virtual void visit( MemberExpr * ) { isConstExpr = false; }
563 virtual void visit( VariableExpr * ) { isConstExpr = false; }
564 // these might be okay?
565 // virtual void visit( SizeofExpr *sizeofExpr );
566 // virtual void visit( AlignofExpr *alignofExpr );
567 // virtual void visit( UntypedOffsetofExpr *offsetofExpr );
568 // virtual void visit( OffsetofExpr *offsetofExpr );
569 // virtual void visit( OffsetPackExpr *offsetPackExpr );
570 // virtual void visit( AttrExpr *attrExpr );
571 // virtual void visit( CommaExpr *commaExpr );
572 // virtual void visit( LogicalExpr *logicalExpr );
573 // virtual void visit( ConditionalExpr *conditionalExpr );
574 virtual void visit( TypeExpr * ) { isConstExpr = false; }
575 virtual void visit( AsmExpr * ) { isConstExpr = false; }
576 virtual void visit( UntypedValofExpr * ) { isConstExpr = false; }
577 virtual void visit( CompoundLiteralExpr * ) { isConstExpr = false; }
578 virtual void visit( UntypedTupleExpr * ) { isConstExpr = false; }
579 virtual void visit( TupleExpr * ) { isConstExpr = false; }
580 virtual void visit( TupleAssignExpr * ) { isConstExpr = false; }
581
582 bool isConstExpr;
583 };
584
585 bool isConstExpr( Expression * expr ) {
586 if ( expr ) {
587 ConstExprChecker checker;
588 expr->accept( checker );
589 return checker.isConstExpr;
590 }
591 return true;
592 }
593
594 bool isConstExpr( Initializer * init ) {
595 if ( init ) {
596 ConstExprChecker checker;
597 init->accept( checker );
598 return checker.isConstExpr;
599 } // if
600 // for all intents and purposes, no initializer means const expr
601 return true;
602 }
603
604 bool isConstructor( const std::string & str ) { return str == "?{}"; }
605 bool isDestructor( const std::string & str ) { return str == "^?{}"; }
606 bool isAssignment( const std::string & str ) { return str == "?=?"; }
607 bool isCtorDtor( const std::string & str ) { return isConstructor( str ) || isDestructor( str ); }
608 bool isCtorDtorAssign( const std::string & str ) { return isCtorDtor( str ) || isAssignment( str ); }
609
610 FunctionDecl * isCopyFunction( Declaration * decl, const std::string & fname ) {
611 FunctionDecl * function = dynamic_cast< FunctionDecl * >( decl );
612 if ( ! function ) return nullptr;
613 if ( function->name != fname ) return nullptr;
614 FunctionType * ftype = function->type;
615 if ( ftype->parameters.size() != 2 ) return nullptr;
616
617 Type * t1 = getPointerBase( ftype->get_parameters().front()->get_type() );
618 Type * t2 = ftype->parameters.back()->get_type();
619 assert( t1 );
620
621 if ( ResolvExpr::typesCompatibleIgnoreQualifiers( t1, t2, SymTab::Indexer() ) ) {
622 return function;
623 } else {
624 return nullptr;
625 }
626 }
627
628 FunctionDecl * isAssignment( Declaration * decl ) {
629 return isCopyFunction( decl, "?=?" );
630 }
631 FunctionDecl * isDestructor( Declaration * decl ) {
632 if ( isDestructor( decl->get_name() ) ) {
633 return dynamic_cast< FunctionDecl * >( decl );
634 }
635 return nullptr;
636 }
637 FunctionDecl * isDefaultConstructor( Declaration * decl ) {
638 if ( isConstructor( decl->name ) ) {
639 if ( FunctionDecl * func = dynamic_cast< FunctionDecl * >( decl ) ) {
640 if ( func->type->parameters.size() == 1 ) {
641 return func;
642 }
643 }
644 }
645 return nullptr;
646 }
647 FunctionDecl * isCopyConstructor( Declaration * decl ) {
648 return isCopyFunction( decl, "?{}" );
649 }
650}
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